Release v0.21.3

Fixes #4165
Fixes #3423
Closes #3424

(cherry picked from commit b19c8abeba)

CHANGELOG.md

@@ -11,34 +11,6 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 - `Other` - for technical stuff.
 
 ## [Unreleased]
-### Added
-- Add experimental high quality reader renderer (Settings → Advanced → Use high quality renderer) with better image scaling, page transition animations, dual page view and display cutout handling ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3388](https://github.com/mihonapp/mihon/pull/3388))
-  - Match background and transition page colors to the old reader ([@AntsyLich](https://github.com/AntsyLich)) ([#3765](https://github.com/mihonapp/mihon/pull/3765))
-  - Support the Fit width, Fit height and Original size scale types and the zoom start position ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3801](https://github.com/mihonapp/mihon/pull/3801))
-  - Fix preloading and navigation across chapters, and right-to-left navigation ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3823](https://github.com/mihonapp/mihon/pull/3823))
-  - Add a "None" page transition and fix the background color of animated images ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3843](https://github.com/mihonapp/mihon/pull/3843))
-  - Improve transition and error pages, dual page animations and border cropping ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3852](https://github.com/mihonapp/mihon/pull/3852))
-  - Fix navigation directions and long strip bounds, and fade in loaded pages ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3870](https://github.com/mihonapp/mihon/pull/3870))
-  - Add a "Page flip" transition, a long strip minimum width setting and separate dual page settings, and show wide pages on their own in dual page view ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3886](https://github.com/mihonapp/mihon/pull/3886))
-  - Fix freezes and running out of memory when jumping between pages with the slider ([@Danidukiyu](https://github.com/Danidukiyu)) ([#3872](https://github.com/mihonapp/mihon/pull/3872))
-  - Add HDR, ICC color profile and EXIF orientation support ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3933](https://github.com/mihonapp/mihon/pull/3933))
-  - Add a page gap setting for long strip with gaps and a "Disable zoom out" setting for long strip modes ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3933](https://github.com/mihonapp/mihon/pull/3933))
-  - Fix a crash on Android 15 and long strip progress and background color ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3949](https://github.com/mihonapp/mihon/pull/3949))
-  - Keep the reader menu open while moving through pages with the slider ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3956](https://github.com/mihonapp/mihon/pull/3956))
-  - Show pages progressively while they download ([@wwww-wwww](https://github.com/wwww-wwww)) ([#4023](https://github.com/mihonapp/mihon/pull/4023))
-  - Lower memory use for animated images and support cropping borders in long strip ([@wwww-wwww](https://github.com/wwww-wwww)) ([#4029](https://github.com/mihonapp/mihon/pull/4029))
-  - Pair more wide pages in dual page view by comparing them with neighbouring pages ([@wwww-wwww](https://github.com/wwww-wwww)) ([#4051](https://github.com/mihonapp/mihon/pull/4051))
-
-### Changed
-- Use a new decoder for images Android can't decode itself, like AVIF, JPEG XL and HEIF, and support JPEG 2000 images ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3786](https://github.com/mihonapp/mihon/pull/3786))
-- Keep online chapters cached for a day instead of up to a size limit ([@AntsyLich](https://github.com/AntsyLich))
-- Apply the reader's grayscale and inverted colors to pages only, not to transition, loading and error pages ([@AntsyLich](https://github.com/AntsyLich))
-
-### Removed
-- Remove "Custom hardware bitmap threshold" and "Custom display profile" advanced settings ([@wwww-wwww](https://github.com/wwww-wwww)) ([#3786](https://github.com/mihonapp/mihon/pull/3786))
-
-### Fixed
-- Fix extension settings showing duplicate entries after the app is restored from the background ([@AntsyLich](https://github.com/AntsyLich))
 
 ## [v0.21.3] - 2026-10-26
 ### Added

app/build.gradle.kts

@@ -273,6 +273,7 @@ dependencies {
     implementation(libs.jsoup)
 
     // Disk
+    implementation(libs.diskLruCache)
     implementation(libs.unifile)
 
     // Preferences
@@ -291,8 +292,6 @@ dependencies {
     }
     implementation(libs.image.decoder)
 
-    implementation(libs.webgpuviewer)
-
     // UI libraries
     implementation(libs.material)
     implementation(libs.photoView)

app/src/main/java/eu/kanade/core/util/CollectionUtils.kt

@@ -59,6 +59,30 @@ inline fun <T> List<T>.fastFilterNot(predicate: (T) -> Boolean): List<T> {
     return fastFilter { !predicate(it) }
 }
 
+/**
+ * Splits the original collection into pair of lists,
+ * where *first* list contains elements for which [predicate] yielded `true`,
+ * while *second* list contains elements for which [predicate] yielded `false`.
+ *
+ * **Do not use for collections that come from public APIs**, since they may not support random
+ * access in an efficient way, and this method may actually be a lot slower. Only use for
+ * collections that are created by code we control and are known to support random access.
+ */
+@OptIn(ExperimentalContracts::class)
+inline fun <T> List<T>.fastPartition(predicate: (T) -> Boolean): Pair<List<T>, List<T>> {
+    contract { callsInPlace(predicate) }
+    val first = ArrayList<T>()
+    val second = ArrayList<T>()
+    fastForEach {
+        if (predicate(it)) {
+            first.add(it)
+        } else {
+            second.add(it)
+        }
+    }
+    return Pair(first, second)
+}
+
 /**
  * Returns the number of entries not matching the given [predicate].
  *

app/src/main/java/eu/kanade/domain/base/BasePreferences.kt

@@ -5,6 +5,7 @@ import dev.icerock.moko.resources.StringResource
 import dev.zacsweers.metro.AppScope
 import dev.zacsweers.metro.Inject
 import dev.zacsweers.metro.SingleIn
+import eu.kanade.tachiyomi.util.system.GLUtil
 import tachiyomi.core.common.preference.Preference
 import tachiyomi.core.common.preference.PreferenceStore
 import tachiyomi.i18n.MR
@@ -37,7 +38,12 @@ class BasePreferences(
         PRIVATE(MR.strings.ext_installer_private, false),
     }
 
-    val highQualityRenderer: Preference<Boolean> = preferenceStore.getBoolean("pref_high_quality_renderer_key", false)
+    val displayProfile: Preference<String> = preferenceStore.getString("pref_display_profile_key", "")
+
+    val hardwareBitmapThreshold: Preference<Int> = preferenceStore.getInt(
+        "pref_hardware_bitmap_threshold",
+        GLUtil.SAFE_TEXTURE_LIMIT,
+    )
 
     val installationId: Preference<String> = preferenceStore.getString(Preference.appStateKey("installation_id"), "")
 

app/src/main/java/eu/kanade/presentation/manga/components/DotSeparatorText.kt

@@ -13,3 +13,13 @@ fun DotSeparatorText(
         modifier = modifier,
     )
 }
+
+@Composable
+fun DotSeparatorNoSpaceText(
+    modifier: Modifier = Modifier,
+) {
+    Text(
+        text = "•",
+        modifier = modifier,
+    )
+}

app/src/main/java/eu/kanade/presentation/manga/components/MangaCoverDialog.kt

@@ -18,7 +18,6 @@ import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -26,9 +25,7 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalDensity
-import androidx.compose.ui.platform.LocalView
 import androidx.compose.ui.unit.DpOffset
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
@@ -36,27 +33,16 @@ import androidx.compose.ui.window.Dialog
 import androidx.compose.ui.window.DialogProperties
 import androidx.core.graphics.drawable.toDrawable
 import androidx.core.view.updatePadding
-import ca.mpreg.webgpuviewer.renderer.GainmapInput
-import ca.mpreg.webgpuviewer.renderer.Image
-import ca.mpreg.webgpuviewer.viewer.ImagePage
-import ca.mpreg.webgpuviewer.viewer.ImageViewer
-import ca.mpreg.webgpuviewer.viewer.ImageViewerState
 import coil3.asDrawable
 import coil3.imageLoader
 import coil3.request.CachePolicy
 import coil3.request.ImageRequest
-import coil3.request.SuccessResult
 import coil3.size.Size
 import eu.kanade.presentation.components.AppBar
 import eu.kanade.presentation.components.AppBarActions
 import eu.kanade.presentation.components.DropdownMenu
 import eu.kanade.presentation.manga.EditCoverAction
-import eu.kanade.tachiyomi.data.coil.ImageDecoder
-import eu.kanade.tachiyomi.data.coil.newDecoder
 import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
-import mihon.app.di.appGraph
 import mihon.icons.materialsymbols.MaterialSymbols
 import mihon.icons.materialsymbols.rounded.Close
 import mihon.icons.materialsymbols.rounded.Edit
@@ -79,9 +65,6 @@ fun MangaCoverDialog(
     onEditClick: ((EditCoverAction) -> Unit)?,
     onDismissRequest: () -> Unit,
 ) {
-    val useNewRenderer = LocalContext.current.appGraph.basePreferences.highQualityRenderer.get()
-    val view = LocalView.current
-
     Dialog(
         onDismissRequest = onDismissRequest,
         properties = DialogProperties(
@@ -168,59 +151,6 @@ fun MangaCoverDialog(
                 }
             },
         ) { contentPadding ->
-            if (useNewRenderer) {
-                val state = remember(manga) { ImageViewerState() }
-                LaunchedEffect(manga) {
-                    val request = ImageRequest.Builder(view.context)
-                        .data(manga)
-                        .size(Size.ORIGINAL)
-                        .memoryCachePolicy(CachePolicy.DISABLED)
-                        .newDecoder(true)
-                        .build()
-                    val result = view.context.imageLoader.execute(request) as? SuccessResult ?: return@LaunchedEffect
-                    val res = result.image as? ImageDecoder.DecodeResultImage ?: return@LaunchedEffect
-                    // Held, then freed, around the upload: its buffer alone doesn't keep
-                    // the frame's native pixels alive.
-                    val page = res.frame.use {
-                        withContext(Dispatchers.Default) {
-                            ImagePage.ImageSingle(
-                                Image(
-                                    res.image,
-                                    res.width,
-                                    res.height,
-                                    createMipMaps = true,
-                                    backgroundColor = 0,
-                                    hdr = res.isHdr,
-                                    hdrHeadroom = res.hdrHeadroom,
-                                    gainmap = res.gainmap?.let {
-                                        GainmapInput(
-                                            pixels = it.pixels,
-                                            width = it.width,
-                                            height = it.height,
-                                            channels = it.channels,
-                                            gamma = it.gamma,
-                                            minContentBoost = it.minContentBoost,
-                                            maxContentBoost = it.maxContentBoost,
-                                            offsetSdr = it.offsetSdr,
-                                            offsetHdr = it.offsetHdr,
-                                        )
-                                    },
-                                ),
-                            )
-                        }
-                    }
-                    state.apply {
-                        fetchPage = { index ->
-                            if (index == 0) page else null
-                        }
-                        invalidate()
-                    }
-                }
-
-                ImageViewer(state = state)
-                return@Scaffold
-            }
-
             val statusBarPaddingPx = with(LocalDensity.current) { contentPadding.calculateTopPadding().roundToPx() }
             val bottomPaddingPx = with(LocalDensity.current) { contentPadding.calculateBottomPadding().roundToPx() }
 

app/src/main/java/eu/kanade/presentation/more/onboarding/PermissionStep.kt

@@ -144,6 +144,20 @@ internal class PermissionStep : OnboardingStep {
         }
     }
 
+    @Composable
+    private fun SectionHeader(
+        text: String,
+        modifier: Modifier = Modifier,
+    ) {
+        Text(
+            text = text,
+            style = MaterialTheme.typography.titleLarge,
+            modifier = modifier
+                .padding(horizontal = 16.dp)
+                .secondaryItemAlpha(),
+        )
+    }
+
     @Composable
     private fun PermissionCheckbox(
         title: String,

app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsAdvancedScreen.kt

@@ -6,6 +6,8 @@ import android.content.Intent
 import android.provider.Settings
 import android.webkit.WebStorage
 import android.webkit.WebView
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
@@ -41,6 +43,7 @@ import eu.kanade.tachiyomi.network.PREF_DOH_QUAD101
 import eu.kanade.tachiyomi.network.PREF_DOH_QUAD9
 import eu.kanade.tachiyomi.network.PREF_DOH_SHECAN
 import eu.kanade.tachiyomi.ui.more.OnboardingScreen
+import eu.kanade.tachiyomi.util.system.GLUtil
 import eu.kanade.tachiyomi.util.system.isReleaseBuildType
 import eu.kanade.tachiyomi.util.system.isShizukuInstalled
 import eu.kanade.tachiyomi.util.system.powerManager
@@ -53,6 +56,7 @@ import kotlinx.coroutines.withContext
 import logcat.LogPriority
 import mihon.app.di.appGraph
 import okhttp3.Headers
+import tachiyomi.core.common.util.system.ImageUtil
 import tachiyomi.core.common.util.system.logcat
 import tachiyomi.domain.library.service.LibraryPreferences
 import tachiyomi.i18n.MR
@@ -342,12 +346,43 @@ object SettingsAdvancedScreen : SearchableSettings {
         basePreferences: BasePreferences,
     ): Preference.PreferenceGroup {
         val context = LocalContext.current
+        val chooseColorProfile = rememberLauncherForActivityResult(
+            contract = ActivityResultContracts.OpenDocument(),
+        ) { uri ->
+            uri?.let {
+                val flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
+                context.contentResolver.takePersistableUriPermission(uri, flags)
+                basePreferences.displayProfile.set(uri.toString())
+            }
+        }
         return Preference.PreferenceGroup(
             title = stringResource(MR.strings.pref_category_reader),
             preferenceItems = listOf(
-                Preference.PreferenceItem.SwitchPreference(
-                    preference = basePreferences.highQualityRenderer,
-                    title = stringResource(MR.strings.pref_high_quality_renderer),
+                Preference.PreferenceItem.ListPreference(
+                    preference = basePreferences.hardwareBitmapThreshold,
+                    entries = GLUtil.CUSTOM_TEXTURE_LIMIT_OPTIONS
+                        .mapIndexed { index, option ->
+                            val display = if (index == 0) {
+                                stringResource(MR.strings.pref_hardware_bitmap_threshold_default, option)
+                            } else {
+                                option.toString()
+                            }
+                            option to display
+                        }
+                        .toMap(),
+                    title = stringResource(MR.strings.pref_hardware_bitmap_threshold),
+                    subtitleProvider = { value, options ->
+                        stringResource(MR.strings.pref_hardware_bitmap_threshold_summary, options[value].orEmpty())
+                    },
+                    visible = !ImageUtil.HARDWARE_BITMAP_UNSUPPORTED &&
+                        GLUtil.DEVICE_TEXTURE_LIMIT > GLUtil.SAFE_TEXTURE_LIMIT,
+                ),
+                Preference.PreferenceItem.TextPreference(
+                    title = stringResource(MR.strings.pref_display_profile),
+                    subtitle = basePreferences.displayProfile.get(),
+                    onClick = {
+                        chooseColorProfile.launch(arrayOf("*/*"))
+                    },
                 ),
             ),
         )

app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsDataScreen.kt

@@ -57,6 +57,7 @@ import eu.kanade.tachiyomi.util.system.workManager
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import logcat.LogPriority
 import mihon.app.di.appGraph
 import mihon.icons.materialsymbols.MaterialSymbols
@@ -286,7 +287,7 @@ object SettingsDataScreen : SearchableSettings {
         val chapterCache = remember { context.appGraph.chapterCache }
         var cacheReadableSizeSema by remember { mutableIntStateOf(0) }
         val cacheReadableSize by produceState("", cacheReadableSizeSema) {
-            value = chapterCache.readableSize()
+            value = withContext(Dispatchers.IO) { chapterCache.readableSize }
         }
 
         return Preference.PreferenceGroup(
@@ -310,7 +311,7 @@ object SettingsDataScreen : SearchableSettings {
                     onClick = {
                         scope.launch {
                             try {
-                                val deletedFiles = chapterCache.clear()
+                                val deletedFiles = withContext(Dispatchers.IO) { chapterCache.clear() }
                                 context.toast(context.stringResource(MR.strings.cache_deleted, deletedFiles))
                                 cacheReadableSizeSema++
                             } catch (e: Exception) {

app/src/main/java/eu/kanade/presentation/more/settings/widget/BasePreferenceWidget.kt

@@ -25,7 +25,6 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
@@ -43,32 +42,27 @@ internal fun BasePreferenceWidget(
     icon: @Composable (() -> Unit)? = null,
     onClick: (() -> Unit)? = null,
     widget: @Composable (() -> Unit)? = null,
-    enabled: Boolean = true,
 ) {
-    val contentAlpha = if (enabled) 1f else DisabledAlpha
     val highlighted = LocalPreferenceHighlighted.current
     val minHeight = LocalPreferenceMinHeight.current
     Row(
         modifier = modifier
             .highlightBackground(highlighted)
             .sizeIn(minHeight = minHeight)
-            .clickable(enabled = enabled && onClick != null, onClick = { onClick?.invoke() })
+            .clickable(enabled = onClick != null, onClick = { onClick?.invoke() })
             .fillMaxWidth(),
         verticalAlignment = Alignment.CenterVertically,
     ) {
         if (icon != null) {
             Box(
-                modifier = Modifier
-                    .padding(start = PrefsHorizontalPadding, end = 8.dp)
-                    .alpha(contentAlpha),
+                modifier = Modifier.padding(start = PrefsHorizontalPadding, end = 8.dp),
                 content = { icon() },
             )
         }
         Column(
             modifier = Modifier
                 .weight(1f)
-                .padding(vertical = PrefsVerticalPadding)
-                .alpha(contentAlpha),
+                .padding(vertical = PrefsVerticalPadding),
         ) {
             if (!title.isNullOrBlank()) {
                 Text(
@@ -129,4 +123,3 @@ internal val TrailingWidgetBuffer = 16.dp
 internal val PrefsHorizontalPadding = 16.dp
 internal val PrefsVerticalPadding = 16.dp
 internal val TitleFontSize = 16.sp
-internal val DisabledAlpha = 0.38f

app/src/main/java/eu/kanade/presentation/more/settings/widget/CheckboxPreferenceWidget.kt

@@ -1,35 +0,0 @@
-package eu.kanade.presentation.more.settings.widget
-
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Checkbox
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.vector.ImageVector
-
-@Composable
-fun CheckboxPreferenceWidget(
-    modifier: Modifier = Modifier,
-    title: String,
-    subtitle: String? = null,
-    icon: ImageVector? = null,
-    checked: Boolean = false,
-    enabled: Boolean = true,
-    onCheckedChanged: (Boolean) -> Unit,
-) {
-    TextPreferenceWidget(
-        modifier = modifier,
-        title = title,
-        subtitle = subtitle,
-        icon = icon,
-        widget = {
-            Checkbox(
-                checked = checked,
-                onCheckedChange = null,
-                enabled = enabled,
-                modifier = Modifier.padding(start = TrailingWidgetBuffer),
-            )
-        },
-        enabled = enabled,
-        onPreferenceClick = { onCheckedChanged(!checked) },
-    )
-}

app/src/main/java/eu/kanade/presentation/more/settings/widget/ListPreferenceWidget.kt

@@ -1,7 +1,6 @@
 package eu.kanade.presentation.more.settings.widget
 
 import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
@@ -47,32 +46,11 @@ fun <T> ListPreferenceWidget(
     )
 
     if (isDialogShown) {
-        ListPreferenceDialog(
-            title = title,
-            value = value,
-            entries = entries,
-            onValueChange = onValueChange,
+        AlertDialog(
             onDismissRequest = { isDialogShown = false },
-        )
-    }
-}
-
-@Composable
-fun <T> ListPreferenceDialog(
-    title: String?,
-    value: T,
-    entries: Map<out T, String>,
-    onValueChange: (T) -> Unit,
-    onDismissRequest: () -> Unit,
-    message: String? = null,
-) {
-    AlertDialog(
-        onDismissRequest = onDismissRequest,
-        title = title?.let { { Text(text = it) } },
-        text = {
-            Column {
-                if (message != null) PreferenceDialogMessage(message)
-                Box(modifier = Modifier.weight(1f, fill = false)) {
+            title = { Text(text = title) },
+            text = {
+                Box {
                     val state = rememberLazyListState()
                     ScrollbarLazyColumn(state = state) {
                         entries.forEach { current ->
@@ -82,8 +60,8 @@ fun <T> ListPreferenceDialog(
                                     label = current.value,
                                     isSelected = isSelected,
                                     onSelected = {
-                                        onValueChange(current.key)
-                                        onDismissRequest()
+                                        onValueChange(current.key!!)
+                                        isDialogShown = false
                                     },
                                 )
                             }
@@ -92,19 +70,14 @@ fun <T> ListPreferenceDialog(
                     if (state.canScrollBackward) HorizontalDivider(modifier = Modifier.align(Alignment.TopCenter))
                     if (state.canScrollForward) HorizontalDivider(modifier = Modifier.align(Alignment.BottomCenter))
                 }
-            }
-        },
-        confirmButton = {
-            TextButton(onClick = onDismissRequest) {
-                Text(text = stringResource(MR.strings.action_cancel))
-            }
-        },
-    )
-}
-
-@Composable
-internal fun PreferenceDialogMessage(message: String) {
-    Text(text = message, modifier = Modifier.padding(bottom = 8.dp))
+            },
+            confirmButton = {
+                TextButton(onClick = { isDialogShown = false }) {
+                    Text(text = stringResource(MR.strings.action_cancel))
+                }
+            },
+        )
+    }
 }
 
 @Composable

app/src/main/java/eu/kanade/presentation/more/settings/widget/MultiSelectListPreferenceWidget.kt

@@ -1,6 +1,5 @@
 package eu.kanade.presentation.more.settings.widget
 
-import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Text
@@ -11,7 +10,6 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.runtime.toMutableStateList
-import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.window.DialogProperties
 import tachiyomi.i18n.MR
@@ -37,37 +35,16 @@ fun <T> MultiSelectListPreferenceWidget(
     )
 
     if (isDialogShown) {
-        MultiSelectListPreferenceDialog(
-            title = title,
-            values = values,
-            entries = entries,
-            onValuesChange = onValuesChange,
+        val selected = remember {
+            entries.keys
+                .filter { values.contains(it) }
+                .toMutableStateList()
+        }
+        AlertDialog(
             onDismissRequest = { isDialogShown = false },
-        )
-    }
-}
-
-@Composable
-fun <T> MultiSelectListPreferenceDialog(
-    title: String?,
-    values: Set<T>,
-    entries: Map<out T, String>,
-    onValuesChange: (Set<T>) -> Unit,
-    onDismissRequest: () -> Unit,
-    message: String? = null,
-) {
-    val selected = remember {
-        entries.keys
-            .filter { values.contains(it) }
-            .toMutableStateList()
-    }
-    AlertDialog(
-        onDismissRequest = onDismissRequest,
-        title = title?.let { { Text(text = it) } },
-        text = {
-            Column {
-                if (message != null) PreferenceDialogMessage(message)
-                LazyColumn(modifier = Modifier.weight(1f, fill = false)) {
+            title = { Text(text = title) },
+            text = {
+                LazyColumn {
                     entries.forEach { current ->
                         item {
                             val isSelected = selected.contains(current.key)
@@ -85,26 +62,25 @@ fun <T> MultiSelectListPreferenceDialog(
                         }
                     }
                 }
-            }
-        },
-        properties = DialogProperties(
-            usePlatformDefaultWidth = true,
-        ),
-        confirmButton = {
-            TextButton(
-                onClick = {
-                    // Values without an entry stay, as they can't be unselected here
-                    onValuesChange(values.filterNot { it in entries.keys }.toMutableSet().apply { addAll(selected) })
-                    onDismissRequest()
-                },
-            ) {
-                Text(text = stringResource(MR.strings.action_ok))
-            }
-        },
-        dismissButton = {
-            TextButton(onClick = onDismissRequest) {
-                Text(text = stringResource(MR.strings.action_cancel))
-            }
-        },
-    )
+            },
+            properties = DialogProperties(
+                usePlatformDefaultWidth = true,
+            ),
+            confirmButton = {
+                TextButton(
+                    onClick = {
+                        onValuesChange(selected.toMutableSet())
+                        isDialogShown = false
+                    },
+                ) {
+                    Text(text = stringResource(MR.strings.action_ok))
+                }
+            },
+            dismissButton = {
+                TextButton(onClick = { isDialogShown = false }) {
+                    Text(text = stringResource(MR.strings.action_cancel))
+                }
+            },
+        )
+    }
 }

app/src/main/java/eu/kanade/presentation/more/settings/widget/SwitchPreferenceWidget.kt

@@ -19,7 +19,6 @@ fun SwitchPreferenceWidget(
     subtitle: String? = null,
     icon: ImageVector? = null,
     checked: Boolean = false,
-    enabled: Boolean = true,
     onCheckedChanged: (Boolean) -> Unit,
 ) {
     TextPreferenceWidget(
@@ -31,11 +30,9 @@ fun SwitchPreferenceWidget(
             Switch(
                 checked = checked,
                 onCheckedChange = null,
-                enabled = enabled,
                 modifier = Modifier.padding(start = TrailingWidgetBuffer),
             )
         },
-        enabled = enabled,
         onPreferenceClick = { onCheckedChanged(!checked) },
     )
 }

app/src/main/java/eu/kanade/presentation/more/settings/widget/TextPreferenceWidget.kt

@@ -24,7 +24,6 @@ fun TextPreferenceWidget(
     icon: ImageVector? = null,
     iconTint: Color = MaterialTheme.colorScheme.primary,
     widget: @Composable (() -> Unit)? = null,
-    enabled: Boolean = true,
     onPreferenceClick: (() -> Unit)? = null,
 ) {
     BasePreferenceWidget(
@@ -57,7 +56,6 @@ fun TextPreferenceWidget(
         },
         onClick = onPreferenceClick,
         widget = widget,
-        enabled = enabled,
     )
 }
 

app/src/main/java/eu/kanade/presentation/reader/OrientationSelectDialog.kt

@@ -39,7 +39,7 @@ fun OrientationSelectDialog(
         DialogContent(
             orientation = orientation,
             onChangeOrientation = {
-                viewModel.setOrientation(it)
+                viewModel.onChangeOrientation(it)
                 onChange(it.stringRes)
                 onDismissRequest()
             },

app/src/main/java/eu/kanade/presentation/reader/ReaderError.kt

@@ -1,65 +0,0 @@
-package eu.kanade.presentation.reader
-
-import androidx.compose.foundation.gestures.awaitEachGesture
-import androidx.compose.foundation.gestures.awaitFirstDown
-import androidx.compose.foundation.gestures.waitForUpOrCancellation
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Button
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.input.pointer.PointerEventPass
-import androidx.compose.ui.input.pointer.pointerInput
-import androidx.compose.ui.text.style.TextAlign
-import androidx.compose.ui.unit.dp
-import tachiyomi.i18n.MR
-import tachiyomi.presentation.core.i18n.stringResource
-
-/**
- * A page that failed to load or decode: the message, Retry, and Open in WebView when [onOpenInWebView] is given.
- *
- * [onButtonPressChange] tells a viewer that reads every touch for its own taps when a button is held.
- */
-@Composable
-fun ReaderError(
-    message: String?,
-    onRetry: () -> Unit,
-    onOpenInWebView: (() -> Unit)?,
-    modifier: Modifier = Modifier,
-    onButtonPressChange: ((pressed: Boolean) -> Unit)? = null,
-) {
-    val buttonModifier = if (onButtonPressChange != null) Modifier.reportPress(onButtonPressChange) else Modifier
-    Column(
-        modifier = modifier.padding(8.dp),
-        horizontalAlignment = Alignment.CenterHorizontally,
-        verticalArrangement = Arrangement.spacedBy(16.dp, Alignment.CenterVertically),
-    ) {
-        Text(
-            text = message ?: stringResource(MR.strings.decode_image_error),
-            style = MaterialTheme.typography.bodyMedium,
-            color = MaterialTheme.colorScheme.onBackground,
-            textAlign = TextAlign.Center,
-        )
-        Button(onClick = onRetry, modifier = buttonModifier) {
-            Text(stringResource(MR.strings.action_retry))
-        }
-        if (onOpenInWebView != null) {
-            Button(onClick = onOpenInWebView, modifier = buttonModifier) {
-                Text(stringResource(MR.strings.action_open_in_web_view))
-            }
-        }
-    }
-}
-
-internal fun Modifier.reportPress(onPressChange: (Boolean) -> Unit) = pointerInput(onPressChange) {
-    awaitEachGesture {
-        awaitFirstDown(requireUnconsumed = false, pass = PointerEventPass.Initial)
-        onPressChange(true)
-        waitForUpOrCancellation(pass = PointerEventPass.Initial)
-        onPressChange(false)
-    }
-}

app/src/main/java/eu/kanade/presentation/reader/ReaderNavigationOverlay.kt

@@ -1,93 +0,0 @@
-package eu.kanade.presentation.reader
-
-import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.core.tween
-import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
-import androidx.compose.foundation.Canvas
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.Stable
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.geometry.Size
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.drawscope.Stroke
-import androidx.compose.ui.platform.LocalDensity
-import androidx.compose.ui.text.TextStyle
-import androidx.compose.ui.text.drawText
-import androidx.compose.ui.text.rememberTextMeasurer
-import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
-import eu.kanade.tachiyomi.ui.reader.viewer.navigation.DisabledNavigation
-import tachiyomi.presentation.core.i18n.stringResource
-
-@Composable
-fun ReaderNavigationOverlay(
-    state: ReaderNavigationOverlayState,
-    modifier: Modifier = Modifier,
-) {
-    AnimatedVisibility(
-        visible = state.visible,
-        modifier = modifier,
-        enter = fadeIn(tween(FADE_DURATION)),
-        exit = fadeOut(tween(FADE_DURATION)),
-    ) {
-        val regions = state.regions
-        val labels = regions.map { stringResource(it.type.nameRes) }
-        val textMeasurer = rememberTextMeasurer()
-        val density = LocalDensity.current
-        val textStyle = remember(density) {
-            TextStyle(color = Color.White, fontSize = with(density) { 64f.toSp() })
-        }
-        val borderStyle = remember(textStyle) {
-            textStyle.copy(color = Color.Black, drawStyle = Stroke(width = 8f))
-        }
-
-        Canvas(modifier = Modifier.fillMaxSize()) {
-            regions.forEachIndexed { index, region ->
-                val rect = region.rect
-                val topLeft = Offset(size.width * rect.left, size.height * rect.top)
-                val regionSize = Size(size.width * rect.width, size.height * rect.height)
-                drawRect(color = region.type.color, topLeft = topLeft, size = regionSize)
-
-                val text = textMeasurer.measure(labels[index], textStyle)
-                val textTopLeft = Offset(
-                    x = topLeft.x + (regionSize.width - text.size.width) / 2,
-                    y = topLeft.y + (regionSize.height - text.size.height) / 2,
-                )
-                drawText(textMeasurer, labels[index], textTopLeft, borderStyle)
-                drawText(text, topLeft = textTopLeft)
-            }
-        }
-    }
-}
-
-@Stable
-class ReaderNavigationOverlayState {
-
-    internal var regions by mutableStateOf(emptyList<ViewerNavigation.Region>())
-    internal var visible by mutableStateOf(false)
-
-    private var navigation: ViewerNavigation? = null
-
-    fun setNavigation(navigation: ViewerNavigation, showOnStart: Boolean) {
-        val firstLaunch = this.navigation == null
-        this.navigation = navigation
-        regions = navigation.getRegions()
-
-        if (visible || (!showOnStart && firstLaunch) || navigation is DisabledNavigation) {
-            return
-        }
-        visible = true
-    }
-
-    fun hide() {
-        visible = false
-    }
-}
-
-private const val FADE_DURATION = 1000

app/src/main/java/eu/kanade/presentation/reader/ReadingModeSelectDialog.kt

@@ -39,7 +39,7 @@ fun ReadingModeSelectDialog(
         DialogContent(
             readingMode = readingMode,
             onChangeReadingMode = {
-                viewModel.setReadingMode(it)
+                viewModel.onChangeReadingMode(it)
                 onChange(it.stringRes)
                 onDismissRequest()
             },

app/src/main/java/eu/kanade/presentation/reader/settings/ReadingModePage.kt

@@ -8,13 +8,15 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
+import androidx.compose.ui.platform.LocalContext
 import eu.kanade.domain.manga.model.readerOrientation
 import eu.kanade.domain.manga.model.readingMode
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderOrientation
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderSettingsViewModel
 import eu.kanade.tachiyomi.ui.reader.setting.ReadingMode
-import eu.kanade.tachiyomi.ui.reader.viewer.webgpu.WebGpuViewerSettings
+import eu.kanade.tachiyomi.ui.reader.viewer.webtoon.WebtoonViewer
+import mihon.app.di.appGraph
 import tachiyomi.i18n.MR
 import tachiyomi.presentation.core.components.CheckboxItem
 import tachiyomi.presentation.core.components.HeadingItem
@@ -26,20 +28,15 @@ import java.text.NumberFormat
 
 @Composable
 internal fun ColumnScope.ReadingModePage(viewModel: ReaderSettingsViewModel) {
-    val isWebGpu by viewModel.isWebGpu.collectAsState()
-    if (isWebGpu) {
-        WebGpuViewerSettings(viewModel)
-        return
-    }
-
     HeadingItem(MR.strings.pref_category_for_this_series)
     val manga by viewModel.mangaFlow.collectAsState()
+
     val readingMode = remember(manga) { ReadingMode.fromPreference(manga?.readingMode?.toInt()) }
     SettingsChipRow(MR.strings.pref_category_reading_mode) {
         ReadingMode.entries.map {
             FilterChip(
                 selected = it == readingMode,
-                onClick = { viewModel.setReadingMode(it) },
+                onClick = { viewModel.onChangeReadingMode(it) },
                 label = { Text(stringResource(it.stringRes)) },
             )
         }
@@ -50,14 +47,14 @@ internal fun ColumnScope.ReadingModePage(viewModel: ReaderSettingsViewModel) {
         ReaderOrientation.entries.map {
             FilterChip(
                 selected = it == orientation,
-                onClick = { viewModel.setOrientation(it) },
+                onClick = { viewModel.onChangeOrientation(it) },
                 label = { Text(stringResource(it.stringRes)) },
             )
         }
     }
 
-    val resolvedReadingMode by viewModel.readingMode.collectAsState()
-    if (resolvedReadingMode.type is ReadingMode.ViewerType.Webtoon) {
+    val viewer by viewModel.viewerFlow.collectAsState()
+    if (viewer is WebtoonViewer) {
         WebtoonViewerSettings(viewModel)
     } else {
         PagerViewerSettings(viewModel)
@@ -210,7 +207,7 @@ private fun ColumnScope.WebtoonViewerSettings(viewModel: ReaderSettingsViewModel
 }
 
 @Composable
-internal fun TapZonesItems(
+private fun ColumnScope.TapZonesItems(
     selected: Int,
     onSelect: (Int) -> Unit,
     invertMode: ReaderPreferences.TappingInvertMode,

app/src/main/java/eu/kanade/tachiyomi/App.kt

@@ -45,6 +45,7 @@ import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.network.NetworkPreferences
 import eu.kanade.tachiyomi.ui.base.delegate.SecureActivityDelegate
 import eu.kanade.tachiyomi.util.system.DeviceUtil
+import eu.kanade.tachiyomi.util.system.GLUtil
 import eu.kanade.tachiyomi.util.system.WebViewUtil
 import eu.kanade.tachiyomi.util.system.animatorDurationScale
 import eu.kanade.tachiyomi.util.system.cancelNotification
@@ -68,6 +69,7 @@ import org.conscrypt.Conscrypt
 import tachiyomi.core.common.i18n.stringResource
 import tachiyomi.core.common.preference.Preference
 import tachiyomi.core.common.preference.PreferenceStore
+import tachiyomi.core.common.util.system.ImageUtil
 import tachiyomi.core.common.util.system.logcat
 import tachiyomi.domain.source.service.SourceManager
 import tachiyomi.i18n.MR
@@ -184,6 +186,14 @@ class App : Application(), DefaultLifecycleObserver, SingletonImageLoader.Factor
             .onEach(TelemetryConfig::setCrashlyticsEnabled)
             .launchIn(scope)
 
+        basePreferences.hardwareBitmapThreshold.let { preference ->
+            if (!preference.isSet()) preference.set(GLUtil.DEVICE_TEXTURE_LIMIT)
+        }
+
+        basePreferences.hardwareBitmapThreshold.changes()
+            .onEach { ImageUtil.hardwareBitmapThreshold = it }
+            .launchIn(scope)
+
         setAppCompatDelegateThemeMode(uiPreferences.themeMode.get())
 
         // Updates widget update

app/src/main/java/eu/kanade/tachiyomi/data/cache/ChapterCache.kt

@@ -0,0 +1,221 @@
+package eu.kanade.tachiyomi.data.cache
+
+import android.content.Context
+import android.text.format.Formatter
+import com.jakewharton.disklrucache.DiskLruCache
+import dev.zacsweers.metro.AppScope
+import dev.zacsweers.metro.Inject
+import dev.zacsweers.metro.SingleIn
+import eu.kanade.tachiyomi.source.model.Page
+import eu.kanade.tachiyomi.util.storage.DiskUtil
+import eu.kanade.tachiyomi.util.storage.saveTo
+import kotlinx.serialization.json.Json
+import logcat.LogPriority
+import okhttp3.Response
+import okio.buffer
+import okio.sink
+import tachiyomi.core.common.util.system.logcat
+import tachiyomi.domain.chapter.model.Chapter
+import java.io.File
+import java.io.IOException
+
+/**
+ * Class used to create chapter cache
+ * For each image in a chapter a file is created
+ * For each chapter a Json list is created and converted to a file.
+ * The files are in format *md5key*.0
+ *
+ * @param context the application context.
+ */
+@Inject
+@SingleIn(AppScope::class)
+class ChapterCache(
+    private val context: Context,
+    private val json: Json,
+) {
+
+    /** Cache class used for cache management. */
+    private val diskCache by lazy {
+        DiskLruCache.open(
+            File(context.cacheDir, "chapter_disk_cache"),
+            PARAMETER_APP_VERSION,
+            PARAMETER_VALUE_COUNT,
+            PARAMETER_CACHE_SIZE,
+        )
+    }
+
+    /**
+     * Returns directory of cache.
+     */
+    private val cacheDir: File
+        get() = diskCache.directory
+
+    /**
+     * Returns real size of directory.
+     */
+    private val realSize: Long
+        get() = DiskUtil.getDirectorySize(cacheDir)
+
+    /**
+     * Returns real size of directory in human readable format.
+     */
+    val readableSize: String
+        get() = Formatter.formatFileSize(context, realSize)
+
+    /**
+     * Get page list from cache.
+     *
+     * @param chapter the chapter.
+     * @return the list of pages.
+     */
+    fun getPageListFromCache(chapter: Chapter): List<Page> {
+        // Get the key for the chapter.
+        val key = DiskUtil.hashKeyForDisk(getKey(chapter))
+
+        // Convert JSON string to list of objects. Throws an exception if snapshot is null
+        return diskCache.get(key).use {
+            json.decodeFromString(it.getString(0))
+        }
+    }
+
+    /**
+     * Add page list to disk cache.
+     *
+     * @param chapter the chapter.
+     * @param pages list of pages.
+     */
+    fun putPageListToCache(chapter: Chapter, pages: List<Page>) {
+        // Convert list of pages to json string.
+        val cachedValue = json.encodeToString(pages)
+
+        // Initialize the editor (edits the values for an entry).
+        var editor: DiskLruCache.Editor? = null
+
+        try {
+            // Get editor from md5 key.
+            val key = DiskUtil.hashKeyForDisk(getKey(chapter))
+            editor = diskCache.edit(key) ?: return
+
+            // Write chapter urls to cache.
+            editor.newOutputStream(0).sink().buffer().use {
+                it.write(cachedValue.toByteArray())
+                it.flush()
+            }
+
+            diskCache.flush()
+            editor.commit()
+            editor.abortUnlessCommitted()
+        } catch (e: Exception) {
+            logcat(LogPriority.WARN, e) { "Failed to put page list to cache" }
+            // Ignore.
+        } finally {
+            editor?.abortUnlessCommitted()
+        }
+    }
+
+    /**
+     * Returns true if image is in cache.
+     *
+     * @param imageUrl url of image.
+     * @return true if in cache otherwise false.
+     */
+    fun isImageInCache(imageUrl: String): Boolean {
+        return try {
+            val key = DiskUtil.hashKeyForDisk(imageUrl)
+            val inJournal = diskCache.get(key).use { it != null }
+            val fileExists = getImageFile(imageUrl).exists()
+            if (inJournal && !fileExists) {
+                logcat(LogPriority.WARN) { "Image is in journal but file is missing: $imageUrl" }
+            }
+            inJournal && fileExists
+        } catch (_: IOException) {
+            false
+        }
+    }
+
+    /**
+     * Get image file from url.
+     *
+     * @param imageUrl url of image.
+     * @return path of image.
+     */
+    fun getImageFile(imageUrl: String): File {
+        // Get file from md5 key.
+        val imageName = DiskUtil.hashKeyForDisk(imageUrl) + ".0"
+        return File(diskCache.directory, imageName)
+    }
+
+    /**
+     * Add image to cache.
+     *
+     * @param imageUrl url of image.
+     * @param response http response from page.
+     * @throws IOException image error.
+     */
+    @Throws(IOException::class)
+    fun putImageToCache(imageUrl: String, response: Response) {
+        // Initialize editor (edits the values for an entry).
+        var editor: DiskLruCache.Editor? = null
+
+        try {
+            // Get editor from md5 key.
+            val key = DiskUtil.hashKeyForDisk(imageUrl)
+            editor = diskCache.edit(key) ?: return
+
+            // Get OutputStream and write image with Okio.
+            response.body.source().saveTo(editor.newOutputStream(0))
+
+            diskCache.flush()
+            editor.commit()
+        } finally {
+            response.body.close()
+            editor?.abortUnlessCommitted()
+        }
+    }
+
+    fun clear(): Int {
+        var deletedFiles = 0
+        cacheDir.listFiles()?.forEach {
+            if (removeFileFromCache(it.name)) {
+                deletedFiles++
+            }
+        }
+        return deletedFiles
+    }
+
+    /**
+     * Remove file from cache.
+     *
+     * @param file name of file "md5.0".
+     * @return status of deletion for the file.
+     */
+    private fun removeFileFromCache(file: String): Boolean {
+        // Make sure we don't delete the journal file (keeps track of cache)
+        if (file == "journal" || file.startsWith("journal.")) {
+            return false
+        }
+
+        return try {
+            // Remove the extension from the file to get the key of the cache
+            val key = file.substringBeforeLast(".")
+            // Remove file from cache
+            diskCache.remove(key)
+        } catch (e: Exception) {
+            logcat(LogPriority.WARN, e) { "Failed to remove file from cache" }
+            false
+        }
+    }
+
+    private fun getKey(chapter: Chapter): String {
+        return "${chapter.mangaId}${chapter.url}"
+    }
+}
+
+/** Application cache version.  */
+private const val PARAMETER_APP_VERSION = 1
+
+/** The number of values per cache entry. Must be positive.  */
+private const val PARAMETER_VALUE_COUNT = 1
+
+/** The maximum number of bytes this cache should use to store.  */
+private const val PARAMETER_CACHE_SIZE = 100L * 1024 * 1024

app/src/main/java/eu/kanade/tachiyomi/data/coil/ImageDecoder.kt

@@ -2,8 +2,6 @@ package eu.kanade.tachiyomi.data.coil
 
 import android.graphics.Bitmap
 import android.graphics.Matrix
-import androidx.core.graphics.createBitmap
-import ca.mpreg.imagedecoder.ImageDecoder
 import coil3.Canvas
 import coil3.Image
 import coil3.ImageLoader
@@ -14,39 +12,20 @@ import coil3.decode.Decoder
 import coil3.decode.ImageSource
 import coil3.fetch.SourceFetchResult
 import coil3.request.Options
+import coil3.request.bitmapConfig
 import kotlinx.coroutines.sync.Semaphore
 import kotlinx.coroutines.sync.withPermit
 import okio.BufferedSource
 import tachiyomi.core.common.util.system.ImageUtil
+import tachiyomi.decoder.ImageDecoder
 import kotlin.math.min
 import kotlin.math.sqrt
 
 /**
- * A [Decoder] that uses [ImageDecoder] to decode image formats not supported
- * by the Android system decoder (AVIF, JXL, HEIF, etc.).
+ * A [Decoder] that uses built-in [ImageDecoder] to decode images that is not supported by the system.
  */
 class ImageDecoder(private val resources: ImageSource, private val options: Options) : Decoder {
 
-    /**
-     * Wraps a raw [ImageDecoder.Frame] as a Coil [Image] for callers that want
-     * direct access to the RGBA [java.nio.ByteBuffer] (e.g. the new-decoder path).
-     */
-    class DecodeResultImage(
-        val frame: ImageDecoder.Frame,
-        val isHdr: Boolean,
-        val hdrHeadroom: Float,
-        val gainmap: ImageDecoder.Gainmap?,
-    ) : Image {
-        val image: java.nio.ByteBuffer get() = frame.image
-
-        // Taken now: a caller may close the frame once it has the pixels.
-        override val size: Long = frame.image.capacity().toLong()
-        override val width: Int get() = frame.width
-        override val height: Int get() = frame.height
-        override val shareable: Boolean get() = true
-        override fun draw(canvas: Canvas) {}
-    }
-
     /**
      * A page cut into immutable strips of about [STRIP_BYTES] each. The renderer uploads an
      * immutable bitmap only when it is drawn, so only the strips on screen reach the GPU instead of
@@ -63,105 +42,102 @@ class ImageDecoder(private val resources: ImageSource, private val options: Opti
     override suspend fun decode(): DecodeResult {
         if (options.webtoonStrips) return decodeStrips()
 
-        return resources.source().use {
-            ImageDecoder.open(it.inputStream()).use { dec ->
-                // Raw frame for custom rendering; sampling is the caller's.
-                if (options.newDecoder) {
-                    return@use DecodeResult(
-                        image = DecodeResultImage(
-                            dec.decodeNext(),
-                            dec.isHdr,
-                            dec.hdrHeadroom,
-                            if (dec.hdrKind == ImageDecoder.HdrKind.GAINMAP) dec.getGainmap() else null,
-                        ),
-                        isSampled = false,
-                    )
-                }
+        val decoder = resources.sourceOrNull()?.use {
+            ImageDecoder.newInstance(it.inputStream(), options.cropBorders, displayProfile)
+        }
 
-                // Shrunk while decoding. Sizes round up, so may be a pixel over BitmapFactory's.
-                val sampleSize = DecodeUtils.calculateInSampleSize(
-                    srcWidth = dec.width,
-                    srcHeight = dec.height,
-                    dstWidth = options.size.widthPx(options.scale) { dec.width },
-                    dstHeight = options.size.heightPx(options.scale) { dec.height },
-                    scale = options.scale,
-                )
-                DecodeResult(
-                    image = dec.decodeToBitmap(null, sampleSize).asImage(),
-                    isSampled = sampleSize > 1,
-                )
+        check(decoder != null && decoder.width > 0 && decoder.height > 0) { "Failed to initialize decoder" }
+
+        val srcWidth = decoder.width
+        val srcHeight = decoder.height
+
+        val dstWidth = options.size.widthPx(options.scale) { srcWidth }
+        val dstHeight = options.size.heightPx(options.scale) { srcHeight }
+
+        val sampleSize = DecodeUtils.calculateInSampleSize(
+            srcWidth = srcWidth,
+            srcHeight = srcHeight,
+            dstWidth = dstWidth,
+            dstHeight = dstHeight,
+            scale = options.scale,
+        )
+
+        var bitmap = decoder.decode(sampleSize = sampleSize)
+        decoder.recycle()
+
+        check(bitmap != null) { "Failed to decode image" }
+
+        if (options.bitmapConfig == Bitmap.Config.HARDWARE && ImageUtil.canUseHardwareBitmap(bitmap)) {
+            val hwBitmap = bitmap.copy(Bitmap.Config.HARDWARE, false)
+            if (hwBitmap != null) {
+                bitmap.recycle()
+                bitmap = hwBitmap
             }
         }
+
+        return DecodeResult(
+            image = bitmap.asImage(),
+            isSampled = sampleSize > 1,
+        )
     }
 
     /**
-     * Copies bands of rows straight from the native frame into strips, so the page never exists as
-     * one Java bitmap on top of the frame. The frame is decoded once, at the largest whole fraction
-     * still at least the strip width: per-strip regions would re-decode the rows above each.
+     * Decodes a webtoon page and cuts it into strips, freeing the decoded page once they're copied.
      *
      * Strips keep the resolution a power-of-two sample size leaves, like the other paths, so zooming
      * in still shows the page's detail, unless that would make the page take more than
      * [MAX_PAGE_BYTES]. They are never narrower than the view, so the page stays sharp unzoomed.
      */
     private suspend fun decodeStrips(): DecodeResult = stripDecodes.withPermit {
-        val (frame, isHdr, widths) = resources.source().use {
-            ImageDecoder.open(it.inputStream()).use { dec ->
-                val bytesPerPixel = if (dec.isHdr) 8 else 4
-                val viewWidth = options.size.widthPx(options.scale) { dec.width }
-                val sampleSize = DecodeUtils.calculateInSampleSize(
-                    srcWidth = dec.width,
-                    srcHeight = dec.height,
-                    dstWidth = viewWidth,
-                    dstHeight = options.size.heightPx(options.scale) { dec.height },
-                    scale = options.scale,
-                )
-                val budgetWidth = sqrt(MAX_PAGE_BYTES.toDouble() / bytesPerPixel * dec.width / dec.height).toInt()
-                val stripWidth = maxOf(viewWidth, min(dec.width / sampleSize, budgetWidth))
-                    // Older GPUs can't draw a texture wider than this
-                    .coerceAtMost(MAX_STRIP_WIDTH)
-                    .coerceIn(1, dec.width)
-                // ceil(width / decodeSample) >= stripWidth: strips only scale down
-                val decodeSample = (dec.width / stripWidth).coerceAtLeast(1)
-                Triple(dec.decode(null, decodeSample), dec.isHdr, stripWidth to dec.width)
-            }
+        val decoder = resources.sourceOrNull()?.use {
+            ImageDecoder.newInstance(it.inputStream(), options.cropBorders, displayProfile)
         }
-        val (stripWidth, pageWidth) = widths
-        frame.use {
-            val config = if (isHdr) Bitmap.Config.RGBA_F16 else Bitmap.Config.ARGB_8888
-            val bytesPerPixel = if (isHdr) 8 else 4
-            val rowBytes = frame.width * bytesPerPixel
-            val scale = stripWidth.toFloat() / frame.width
+        check(decoder != null && decoder.width > 0 && decoder.height > 0) { "Failed to initialize decoder" }
 
-            // Strips of about the same size in bytes, so each takes about as long to upload
-            val stripRows = (STRIP_BYTES / (stripWidth * bytesPerPixel)).coerceAtLeast(1)
-            val bandRows = (stripRows / scale).toInt().coerceIn(1, frame.height)
-            val matrix = Matrix().apply { setScale(scale, scale) }
-            val band = createBitmap(frame.width, bandRows, config)
-            val strips = (0..<frame.height step bandRows).map { top ->
-                val rows = min(bandRows, frame.height - top)
-                if (rows != band.height) band.reconfigure(frame.width, rows, config)
-                band.copyPixelsFromBuffer(
-                    frame.image.duplicate().apply {
-                        position(top * rowBytes)
-                        limit((top + rows) * rowBytes)
-                    },
-                )
-                val strip = if (stripWidth < frame.width) {
-                    Bitmap.createBitmap(band, 0, 0, frame.width, rows, matrix, true)
-                } else {
-                    band
-                }
-                // createBitmap returns a mutable bitmap despite its docs, and copy is the only way to an immutable one
-                strip.copy(config, false).also { if (strip !== band) strip.recycle() }
+        val srcWidth = decoder.width
+        val viewWidth = options.size.widthPx(options.scale) { srcWidth }
+        val sampleSize = DecodeUtils.calculateInSampleSize(
+            srcWidth = decoder.width,
+            srcHeight = decoder.height,
+            dstWidth = viewWidth,
+            dstHeight = options.size.heightPx(options.scale) { decoder.height },
+            scale = options.scale,
+        )
+        val page = decoder.decode(sampleSize = sampleSize)
+        decoder.recycle()
+        check(page != null) { "Failed to decode image" }
+
+        val config = page.config ?: Bitmap.Config.ARGB_8888
+        val bytesPerPixel = page.rowBytes / page.width
+        val budgetWidth = sqrt(MAX_PAGE_BYTES.toDouble() / bytesPerPixel * page.width / page.height).toInt()
+        val stripWidth = maxOf(viewWidth, min(page.width, budgetWidth))
+            // Older GPUs can't draw a texture wider than this
+            .coerceAtMost(MAX_STRIP_WIDTH)
+            .coerceIn(1, page.width)
+        val scale = stripWidth.toFloat() / page.width
+
+        // Strips of about the same size in bytes, so each takes about as long to upload
+        val stripRows = (STRIP_BYTES / (stripWidth * bytesPerPixel)).coerceAtLeast(1)
+        val bandRows = (stripRows / scale).toInt().coerceIn(1, page.height)
+        val matrix = Matrix().apply { setScale(scale, scale) }
+        val strips = (0..<page.height step bandRows).map { top ->
+            val rows = min(bandRows, page.height - top)
+            val band = if (stripWidth < page.width) {
+                Bitmap.createBitmap(page, 0, top, page.width, rows, matrix, true)
+            } else {
+                Bitmap.createBitmap(page, 0, top, page.width, rows)
             }
-            band.recycle()
-            DecodeResult(image = StripsImage(strips), isSampled = stripWidth < pageWidth)
+            // createBitmap returns a mutable bitmap despite its docs, and copy is the only way to an immutable one
+            band.copy(config, false).also { if (band !== page) band.recycle() }
         }
+        page.recycle()
+        DecodeResult(image = StripsImage(strips), isSampled = stripWidth < srcWidth)
     }
 
     class Factory : Decoder.Factory {
+
         override fun create(result: SourceFetchResult, options: Options, imageLoader: ImageLoader): Decoder? {
-            return if (options.newDecoder || options.webtoonStrips || isApplicable(result.source.source())) {
+            return if (options.webtoonStrips || isApplicable(result.source.source())) {
                 ImageDecoder(result.source, options)
             } else {
                 null
@@ -173,12 +149,7 @@ class ImageDecoder(private val resources: ImageSource, private val options: Opti
                 ImageUtil.findImageType(it)
             }
             return when (type) {
-                ImageUtil.ImageType.AVIF,
-                ImageUtil.ImageType.JXL,
-                ImageUtil.ImageType.HEIF,
-                ImageUtil.ImageType.JP2,
-                -> true
-
+                ImageUtil.ImageType.AVIF, ImageUtil.ImageType.JXL, ImageUtil.ImageType.HEIF -> true
                 else -> false
             }
         }
@@ -187,6 +158,10 @@ class ImageDecoder(private val resources: ImageSource, private val options: Opti
 
         override fun hashCode() = javaClass.hashCode()
     }
+
+    companion object {
+        var displayProfile: ByteArray? = null
+    }
 }
 
 private const val STRIP_BYTES = 4 * 1024 * 1024
@@ -195,5 +170,5 @@ private const val MAX_PAGE_BYTES = 128 * 1024 * 1024
 
 private const val MAX_STRIP_WIDTH = 4096
 
-// Each decode holds the whole native frame until its strips are copied, and the reader loads pages ahead in parallel
+// Each decode holds the whole page until its strips are copied, and the reader loads pages ahead in parallel
 private val stripDecodes = Semaphore(1)

app/src/main/java/eu/kanade/tachiyomi/data/coil/Utils.kt

@@ -42,11 +42,3 @@ val Options.webtoonStrips: Boolean
     get() = getExtra(webtoonStripsKey)
 
 private val webtoonStripsKey = Extras.Key(default = false)
-
-fun ImageRequest.Builder.newDecoder(enable: Boolean) = apply {
-    extras[newDecoderKey] = enable
-}
-val Options.newDecoder: Boolean
-    get() = getExtra(newDecoderKey)
-
-private val newDecoderKey = Extras.Key(default = false)

app/src/main/java/eu/kanade/tachiyomi/data/download/Downloader.kt

@@ -7,6 +7,7 @@ import dev.zacsweers.metro.Inject
 import dev.zacsweers.metro.SingleIn
 import eu.kanade.domain.chapter.model.toSChapter
 import eu.kanade.domain.manga.model.getComicInfo
+import eu.kanade.tachiyomi.data.cache.ChapterCache
 import eu.kanade.tachiyomi.data.download.model.Download
 import eu.kanade.tachiyomi.data.library.LibraryUpdateNotifier
 import eu.kanade.tachiyomi.data.notification.NotificationHandler
@@ -49,7 +50,6 @@ import kotlinx.coroutines.withContext
 import logcat.LogPriority
 import mihon.core.archive.ZipWriter
 import mihon.core.metro.AppCoroutineScope
-import mihon.data.cache.ChapterCache
 import nl.adaptivity.xmlutil.serialization.XML
 import okhttp3.Response
 import tachiyomi.core.common.i18n.stringResource
@@ -64,6 +64,7 @@ import tachiyomi.domain.manga.model.Manga
 import tachiyomi.domain.source.service.SourceManager
 import tachiyomi.domain.track.interactor.GetTracks
 import tachiyomi.i18n.MR
+import java.io.File
 import java.util.Locale
 import java.util.concurrent.ConcurrentHashMap
 import kotlin.time.Duration.Companion.seconds
@@ -543,8 +544,10 @@ class Downloader(
             // If the image is already downloaded, do nothing. Otherwise download from network
             val file = when {
                 imageFile != null -> imageFile
-                else -> copyImageFromCache(page.imageUrl!!, tmpDir, filename)
-                    ?: downloadImage(page, download.source, tmpDir, filename)
+                chapterCache.isImageInCache(
+                    page.imageUrl!!,
+                ) -> copyImageFromCache(chapterCache.getImageFile(page.imageUrl!!), tmpDir, filename)
+                else -> downloadImage(page, download.source, tmpDir, filename)
             }
 
             // When the page is ready, set page path, progress (just in case) and status
@@ -607,25 +610,24 @@ class Downloader(
     }
 
     /**
-     * Copies the image from cache to file in tmpDir, or returns null when it isn't cached.
+     * Copies the image from cache to file in tmpDir.
      *
-     * @param imageUrl the url of the image.
+     * @param cacheFile the file from cache.
      * @param tmpDir the temporary directory of the download.
      * @param filename the filename of the image.
      */
-    private suspend fun copyImageFromCache(imageUrl: String, tmpDir: UniFile, filename: String): UniFile? {
-        val tmpFile = chapterCache.openImage(imageUrl)?.use { input ->
-            // Delete temp file if it exists
-            tmpDir.findFile("$filename.tmp")?.delete()
-            tmpDir.createFile("$filename.tmp")!!.also { tmpFile ->
-                tmpFile.openOutputStream().use { output ->
-                    input.copyTo(output)
-                }
+    private fun copyImageFromCache(cacheFile: File, tmpDir: UniFile, filename: String): UniFile {
+        // Delete temp file if it exists
+        tmpDir.findFile("$filename.tmp")?.delete()
+        val tmpFile = tmpDir.createFile("$filename.tmp")!!
+        cacheFile.inputStream().use { input ->
+            tmpFile.openOutputStream().use { output ->
+                input.copyTo(output)
             }
-        } ?: return null
-        chapterCache.removeImage(imageUrl)
-        val extension = tmpFile.openInputStream().use { ImageUtil.findImageType(it) } ?: return tmpFile
+        }
+        val extension = ImageUtil.findImageType(cacheFile.inputStream()) ?: return tmpFile
         tmpFile.renameTo("$filename.${extension.extension}")
+        cacheFile.delete()
         return tmpFile
     }
 

app/src/main/java/eu/kanade/tachiyomi/data/notification/NotificationHandler.kt

@@ -50,6 +50,20 @@ object NotificationHandler {
         )
     }
 
+    /**
+     * Returns [PendingIntent] that prompts user with apk install intent
+     *
+     * @param context context
+     * @param uri uri of apk that is installed
+     */
+    fun installApkPendingActivity(context: Context, uri: Uri): PendingIntent {
+        val intent = Intent(Intent.ACTION_VIEW).apply {
+            setDataAndType(uri, ExtensionInstaller.APK_MIME)
+            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_GRANT_READ_URI_PERMISSION
+        }
+        return PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_IMMUTABLE)
+    }
+
     fun openUrl(context: Context, url: String): PendingIntent {
         val notificationIntent = Intent(Intent.ACTION_VIEW, url.toUri())
         return PendingIntent.getActivity(context, 0, notificationIntent, PendingIntent.FLAG_IMMUTABLE)

app/src/main/java/eu/kanade/tachiyomi/data/notification/NotificationReceiver.kt

@@ -294,6 +294,26 @@ class NotificationReceiver : BroadcastReceiver() {
             )
         }
 
+        /**
+         * Returns [PendingIntent] that starts a service which dismissed the notification
+         *
+         * @param context context of application
+         * @param notificationId id of notification
+         * @return [PendingIntent]
+         */
+        internal fun dismissNotificationPendingBroadcast(context: Context, notificationId: Int): PendingIntent {
+            val intent = Intent(context, NotificationReceiver::class.java).apply {
+                action = ACTION_DISMISS_NOTIFICATION
+                putExtra(EXTRA_NOTIFICATION_ID, notificationId)
+            }
+            return PendingIntent.getBroadcast(
+                context,
+                0,
+                intent,
+                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
+            )
+        }
+
         /**
          * Returns [PendingIntent] that starts a service which dismissed the notification
          *

app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/details/SourcePreferencesScreen.kt

@@ -1,73 +1,49 @@
 package eu.kanade.tachiyomi.ui.browse.extension.details
 
-import android.annotation.SuppressLint
 import android.content.Context
-import android.content.SharedPreferences
-import android.view.ViewGroup
-import android.view.WindowManager
-import android.widget.Button
-import android.widget.EditText
-import android.widget.LinearLayout
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.lazy.items
-import androidx.compose.material3.AlertDialog
-import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
+import android.os.Bundle
+import android.util.TypedValue
+import android.view.View
+import androidx.appcompat.view.ContextThemeWrapper
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.DisposableEffect
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.SideEffect
-import androidx.compose.runtime.Stable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.produceState
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.platform.LocalView
 import androidx.compose.ui.viewinterop.AndroidView
-import androidx.compose.ui.window.DialogWindowProvider
-import androidx.core.widget.doAfterTextChanged
-import androidx.preference.CheckBoxPreference
+import androidx.fragment.app.FragmentActivity
+import androidx.fragment.app.FragmentContainerView
+import androidx.fragment.app.FragmentManager
+import androidx.fragment.app.FragmentTransaction
+import androidx.fragment.app.commit
+import androidx.lifecycle.lifecycleScope
 import androidx.preference.DialogPreference
 import androidx.preference.EditTextPreference
-import androidx.preference.ListPreference
-import androidx.preference.MultiSelectListPreference
-import androidx.preference.Preference
-import androidx.preference.PreferenceGroup
-import androidx.preference.PreferenceManager
+import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.PreferenceScreen
-import androidx.preference.TwoStatePreference
+import androidx.preference.R
+import androidx.preference.forEach
 import androidx.preference.getOnBindEditTextListener
-import androidx.preference.setOnStateChangeListener
 import cafe.adriel.voyager.navigator.LocalNavigator
 import cafe.adriel.voyager.navigator.currentOrThrow
 import eu.kanade.presentation.components.AppBar
-import eu.kanade.presentation.more.settings.widget.CheckboxPreferenceWidget
-import eu.kanade.presentation.more.settings.widget.ListPreferenceDialog
-import eu.kanade.presentation.more.settings.widget.MultiSelectListPreferenceDialog
-import eu.kanade.presentation.more.settings.widget.PreferenceDialogMessage
-import eu.kanade.presentation.more.settings.widget.PreferenceGroupHeader
-import eu.kanade.presentation.more.settings.widget.SwitchPreferenceWidget
-import eu.kanade.presentation.more.settings.widget.TextPreferenceWidget
 import eu.kanade.presentation.util.Screen
 import eu.kanade.tachiyomi.data.preference.SharedPreferencesDataStore
 import eu.kanade.tachiyomi.source.ConfigurableSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.sourcePreferences
-import eu.kanade.tachiyomi.util.view.setIncognito
+import eu.kanade.tachiyomi.widget.TachiyomiTextInputEditText.Companion.setIncognito
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import mihon.app.di.appGraph
-import tachiyomi.i18n.MR
-import tachiyomi.presentation.core.components.ScrollbarLazyColumn
 import tachiyomi.presentation.core.components.material.Scaffold
-import tachiyomi.presentation.core.i18n.stringResource
 import tachiyomi.presentation.core.screens.LoadingScreen
 
 class SourcePreferencesScreen(val sourceId: Long) : Screen() {
@@ -77,290 +53,135 @@ class SourcePreferencesScreen(val sourceId: Long) : Screen() {
         val context = LocalContext.current
         val navigator = LocalNavigator.currentOrThrow
 
-        // The preferences are made anew after a configuration change, so an open dialog is restored by key
-        var savedDialogKey by rememberSaveable { mutableStateOf<String?>(null) }
-
-        val screen by produceState<ExtensionPreferenceScreen?>(initialValue = null) {
-            val source = context.appGraph.sourceManager.getOrStub(sourceId)
-            // Reading a value loads the file, which shouldn't happen on the main thread
-            val sourcePreferences = (source as? ConfigurableSource)?.let {
-                withContext(Dispatchers.IO) { it.sourcePreferences().apply { all } }
-            }
-            value = ExtensionPreferenceScreen(context, source, sourcePreferences, savedDialogKey)
+        val source by produceState<Source?>(initialValue = null) {
+            value = context.appGraph.sourceManager.getOrStub(sourceId)
         }
 
-        val preferenceScreen = screen
-        if (preferenceScreen == null) {
+        if (source == null) {
             LoadingScreen()
             return
         }
 
-        DisposableEffect(preferenceScreen) {
-            onDispose { preferenceScreen.dispose() }
-        }
-        SideEffect { savedDialogKey = preferenceScreen.dialogPreference?.key }
-
         Scaffold(
             topBar = {
                 AppBar(
-                    title = preferenceScreen.title,
+                    title = source.toString(),
                     navigateUp = navigator::pop,
                     scrollBehavior = it,
                 )
             },
         ) { contentPadding ->
-            val items = remember(preferenceScreen.version) { preferenceScreen.items() }
-            ScrollbarLazyColumn(contentPadding = contentPadding) {
-                items(items) { PreferenceRow(it) }
+            FragmentContainer(
+                fragmentManager = (context as FragmentActivity).supportFragmentManager,
+                modifier = Modifier
+                    .fillMaxSize()
+                    .padding(contentPadding),
+            ) {
+                add(it, SourcePreferencesFragment.getInstance(sourceId), null)
             }
         }
+    }
 
-        preferenceScreen.dialogPreference?.let {
-            PreferenceDialog(
-                preference = it,
-                onDismissRequest = { preferenceScreen.dialogPreference = null },
-            )
+    /**
+     * From https://stackoverflow.com/questions/60520145/fragment-container-in-jetpack-compose/70817794#70817794
+     */
+    @Composable
+    private fun FragmentContainer(
+        fragmentManager: FragmentManager,
+        modifier: Modifier = Modifier,
+        commit: FragmentTransaction.(containerId: Int) -> Unit,
+    ) {
+        val containerId by rememberSaveable {
+            mutableIntStateOf(View.generateViewId())
         }
-    }
-}
-
-/**
- * The screen an extension fills in [ConfigurableSource.setupPreferenceScreen]. The [androidx.preference] objects stay
- * the model, so extensions keep the exact behaviour of the library, and are only drawn with Compose.
- */
-@Stable
-@SuppressLint("RestrictedApi")
-private class ExtensionPreferenceScreen(
-    context: Context,
-    source: Source,
-    sourcePreferences: SharedPreferences?,
-    dialogKey: String?,
-) {
-    val title = source.toString()
-
-    // Bumped on every change the library would rebind a preference's view for
-    var version by mutableIntStateOf(0)
-        private set
-
-    var dialogPreference by mutableStateOf<DialogPreference?>(null)
-
-    private val screen: PreferenceScreen
-
-    init {
-        val preferenceManager = PreferenceManager(context)
-        if (sourcePreferences != null) {
-            preferenceManager.preferenceDataStore = SharedPreferencesDataStore(sourcePreferences)
-        }
-        preferenceManager.setOnDisplayPreferenceDialogListener { dialogPreference = it as? DialogPreference }
-
-        screen = preferenceManager.createPreferenceScreen(context)
-        (source as? ConfigurableSource)?.setupPreferenceScreen(screen)
-        preferenceManager.setPreferences(screen)
-        screen.onAttached()
-        observe(screen)
-        dialogPreference = dialogKey?.let { screen.findPreference<Preference>(it) as? DialogPreference }
-    }
-
-    private fun observe(preference: Preference) {
-        preference.setOnStateChangeListener {
-            // A group changing may mean preferences were added to it
-            if (it is PreferenceGroup) observe(it)
-            version++
-        }
-        if (preference is PreferenceGroup) {
-            repeat(preference.preferenceCount) { observe(preference.getPreference(it)) }
-        }
-    }
-
-    fun items(): List<PreferenceItem> = buildList { addVisible(screen) }
-
-    private fun MutableList<PreferenceItem>.addVisible(group: PreferenceGroup) {
-        repeat(group.preferenceCount) {
-            val preference = group.getPreference(it)
-            if (!preference.isVisible) return@repeat
-            add(PreferenceItem.of(preference))
-            if (preference is PreferenceGroup) addVisible(preference)
-        }
-    }
-
-    fun dispose() {
-        screen.onDetached()
-    }
-}
-
-/**
- * What a preference shows, read once per change so the list redraws when an extension changes a preference.
- */
-private data class PreferenceItem(
-    val preference: Preference,
-    val title: String?,
-    val summary: String?,
-    val enabled: Boolean,
-    val checked: Boolean?,
-) {
-    companion object {
-        fun of(preference: Preference): PreferenceItem {
-            val summary = when {
-                preference !is TwoStatePreference -> preference.summary
-                preference.isChecked && !preference.summaryOn.isNullOrEmpty() -> preference.summaryOn
-                !preference.isChecked && !preference.summaryOff.isNullOrEmpty() -> preference.summaryOff
-                else -> preference.summary
-            }
-            return PreferenceItem(
-                preference = preference,
-                title = preference.title?.toString(),
-                summary = summary?.toString(),
-                enabled = preference.isEnabled,
-                checked = (preference as? TwoStatePreference)?.isChecked,
-            )
-        }
-    }
-}
-
-@SuppressLint("RestrictedApi")
-@Composable
-private fun PreferenceRow(item: PreferenceItem) {
-    val preference = item.preference
-    val onClick = if (preference.isSelectable) preference::performClick else null
-    when {
-        preference is PreferenceGroup -> PreferenceGroupHeader(title = item.title.orEmpty())
-        preference is CheckBoxPreference -> CheckboxPreferenceWidget(
-            title = item.title.orEmpty(),
-            subtitle = item.summary,
-            checked = item.checked == true,
-            enabled = item.enabled,
-            onCheckedChanged = { onClick?.invoke() },
-        )
-        item.checked != null -> SwitchPreferenceWidget(
-            title = item.title.orEmpty(),
-            subtitle = item.summary,
-            checked = item.checked,
-            enabled = item.enabled,
-            onCheckedChanged = { onClick?.invoke() },
-        )
-        else -> TextPreferenceWidget(
-            title = item.title,
-            subtitle = item.summary,
-            enabled = item.enabled,
-            onPreferenceClick = onClick,
-        )
-    }
-}
-
-@Composable
-private fun PreferenceDialog(preference: DialogPreference, onDismissRequest: () -> Unit) {
-    val title = (preference.dialogTitle?.takeIf { it.isNotEmpty() } ?: preference.title)?.toString()
-    val message = preference.dialogMessage?.toString()
-    when (preference) {
-        is ListPreference -> ListPreferenceDialog(
-            title = title,
-            message = message,
-            value = preference.value,
-            entries = entryMap(preference.entries, preference.entryValues),
-            onValueChange = {
-                if (preference.callChangeListener(it)) preference.value = it
+        var initialized by rememberSaveable { mutableStateOf(false) }
+        AndroidView(
+            modifier = modifier,
+            factory = { context ->
+                FragmentContainerView(context)
+                    .apply { id = containerId }
             },
-            onDismissRequest = onDismissRequest,
-        )
-        is MultiSelectListPreference -> MultiSelectListPreferenceDialog(
-            title = title,
-            message = message,
-            values = preference.values,
-            entries = entryMap(preference.entries, preference.entryValues),
-            onValuesChange = {
-                val values = it.toHashSet()
-                if (values != preference.values && preference.callChangeListener(values)) {
-                    preference.values = values
+            update = { view ->
+                if (!initialized) {
+                    fragmentManager.commit { commit(view.id) }
+                    initialized = true
+                } else {
+                    fragmentManager.onContainerAvailable(view)
                 }
             },
-            onDismissRequest = onDismissRequest,
         )
-        is EditTextPreference -> EditTextPreferenceDialog(preference, title, message, onDismissRequest)
-        else -> LaunchedEffect(preference) { onDismissRequest() }
+    }
+
+    /** Access to package-private method in FragmentManager through reflection */
+    private fun FragmentManager.onContainerAvailable(view: FragmentContainerView) {
+        val method = FragmentManager::class.java.getDeclaredMethod(
+            "onContainerAvailable",
+            FragmentContainerView::class.java,
+        )
+        method.isAccessible = true
+        method.invoke(this, view)
     }
 }
 
-private fun entryMap(entries: Array<CharSequence>?, entryValues: Array<CharSequence>?): Map<String, String> {
-    return entryValues.orEmpty().zip(entries.orEmpty()) { value, entry -> value.toString() to entry.toString() }.toMap()
-}
+class SourcePreferencesFragment : PreferenceFragmentCompat() {
 
-/**
- * Extensions get a real [EditText] through [EditTextPreference.OnBindEditTextListener], and some validate input by
- * disabling the dialog's `android.R.id.button1` found from [EditText.getRootView], so one stands in for the OK button.
- */
-@Composable
-private fun EditTextPreferenceDialog(
-    preference: EditTextPreference,
-    title: String?,
-    message: String?,
-    onDismissRequest: () -> Unit,
-) {
-    val context = LocalContext.current
-    val scope = rememberCoroutineScope()
-    // What's typed, kept across a configuration change
-    var draft by rememberSaveable { mutableStateOf<String?>(null) }
-    var editText by remember { mutableStateOf<EditText?>(null) }
-    var confirmEnabled by remember { mutableStateOf(true) }
-    AlertDialog(
-        onDismissRequest = onDismissRequest,
-        title = title?.let { { Text(text = it) } },
-        text = {
-            // Like the library's dialog, which shows the keyboard as it opens
-            val window = (LocalView.current.parent as? DialogWindowProvider)?.window
-            SideEffect { window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE) }
-            Column {
-                if (message != null) PreferenceDialogMessage(message)
-                AndroidView(
-                    factory = { viewContext ->
-                        LinearLayout(viewContext).apply {
-                            val confirmButton = object : Button(viewContext) {
-                                init {
-                                    id = android.R.id.button1
-                                    visibility = GONE
-                                }
+    override fun getContext(): Context? {
+        val superCtx = super.getContext() ?: return null
+        val tv = TypedValue()
+        superCtx.theme.resolveAttribute(R.attr.preferenceTheme, tv, true)
+        return ContextThemeWrapper(superCtx, tv.resourceId)
+    }
 
-                                override fun setEnabled(enabled: Boolean) {
-                                    super.setEnabled(enabled)
-                                    confirmEnabled = enabled
-                                }
-                            }
-                            addView(confirmButton)
-                            val field = EditText(viewContext).apply {
-                                // In the order the library's own dialog binds it
-                                setText(draft ?: preference.text)
-                                setSelection(text.length)
-                                setIncognito(context.appGraph.basePreferences, scope)
-                                preference.getOnBindEditTextListener()?.onBindEditText(this)
-                                doAfterTextChanged { draft = it?.toString() }
-                                // Focus only takes once attached to the dialog's window
-                                post { requestFocus() }
-                            }
-                            addView(field, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
-                            editText = field
-                        }
-                    },
-                    modifier = Modifier.fillMaxWidth(),
-                )
-            }
-        },
-        confirmButton = {
-            TextButton(
-                enabled = confirmEnabled,
-                onClick = {
-                    val value = editText?.text?.toString()
-                    if (value != null && preference.callChangeListener(value)) {
-                        preference.text = value
+    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+        preferenceScreen = preferenceManager.createPreferenceScreen(requireContext())
+        lifecycleScope.launch {
+            preferenceScreen = populateScreen()
+        }
+    }
+
+    private suspend fun populateScreen(): PreferenceScreen {
+        val sourceId = requireArguments().getLong(SOURCE_ID)
+        val appGraph = requireContext().appGraph
+        val source = appGraph.sourceManager.getOrStub(sourceId)
+        val basePreferences = appGraph.basePreferences
+        val sourceScreen = preferenceManager.createPreferenceScreen(requireContext())
+
+        if (source is ConfigurableSource) {
+            val sourcePreferences = withContext(Dispatchers.IO) { source.sourcePreferences().also { it.all } }
+            val dataStore = SharedPreferencesDataStore(sourcePreferences)
+            preferenceManager.preferenceDataStore = dataStore
+
+            source.setupPreferenceScreen(sourceScreen)
+            sourceScreen.forEach { pref ->
+                pref.isIconSpaceReserved = false
+                pref.isSingleLineTitle = false
+                if (pref is DialogPreference && pref.dialogTitle.isNullOrEmpty()) {
+                    pref.dialogTitle = pref.title
+                }
+
+                // Apply incognito IME for EditTextPreference
+                if (pref is EditTextPreference) {
+                    val setListener = pref.getOnBindEditTextListener()
+                    pref.setOnBindEditTextListener {
+                        setListener?.onBindEditText(it)
+                        it.setIncognito(basePreferences, lifecycleScope)
                     }
-                    onDismissRequest()
-                },
-            ) {
-                Text(text = stringResource(MR.strings.action_ok))
+                }
             }
-        },
-        dismissButton = {
-            TextButton(onClick = onDismissRequest) {
-                Text(text = stringResource(MR.strings.action_cancel))
+        }
+
+        return sourceScreen
+    }
+
+    companion object {
+        private const val SOURCE_ID = "source_id"
+
+        fun getInstance(sourceId: Long): SourcePreferencesFragment {
+            return SourcePreferencesFragment().apply {
+                arguments = Bundle().apply {
+                    putLong(SOURCE_ID, sourceId)
+                }
             }
-        },
-    )
+        }
+    }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt

@@ -80,6 +80,7 @@ import eu.kanade.presentation.more.settings.screen.browse.ExtensionStoresScreen
 import eu.kanade.presentation.more.settings.screen.data.RestoreBackupScreen
 import eu.kanade.presentation.util.AssistContentScreen
 import eu.kanade.presentation.util.DefaultNavigatorScreenTransition
+import eu.kanade.tachiyomi.data.cache.ChapterCache
 import eu.kanade.tachiyomi.data.download.DownloadCache
 import eu.kanade.tachiyomi.data.notification.NotificationReceiver
 import eu.kanade.tachiyomi.extension.ExtensionManager
@@ -98,6 +99,7 @@ import eu.kanade.tachiyomi.util.system.isNavigationBarNeedsScrim
 import eu.kanade.tachiyomi.util.system.updaterEnabled
 import eu.kanade.tachiyomi.util.view.setComposeContent
 import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -113,7 +115,6 @@ import mihon.app.di.AppGraph
 import mihon.app.di.appGraph
 import mihon.core.metro.metroGraph
 import mihon.core.migration.Migrator
-import mihon.data.cache.ChapterCache
 import mihon.domain.database.repository.DatabaseRepository
 import mihon.feature.support.SupportUsScreen
 import mihon.icons.materialsymbols.MaterialSymbols
@@ -324,7 +325,9 @@ class MainActivity : BaseActivity() {
         setSplashScreenExitAnimation(splashScreen)
 
         if (isLaunch && libraryPreferences.autoClearChapterCache.get()) {
-            lifecycleScope.launch { chapterCache.clear() }
+            lifecycleScope.launch(Dispatchers.IO) {
+                chapterCache.clear()
+            }
         }
     }
 

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -1,75 +1,56 @@
 package eu.kanade.tachiyomi.ui.reader
 
+import android.annotation.SuppressLint
 import android.app.assist.AssistContent
 import android.content.ClipData
 import android.content.ClipboardManager
 import android.content.Context
 import android.content.Intent
+import android.graphics.ColorMatrix
+import android.graphics.ColorMatrixColorFilter
+import android.graphics.Paint
 import android.net.Uri
 import android.os.Build
 import android.os.Bundle
+import android.view.KeyEvent
+import android.view.MotionEvent
+import android.view.View
+import android.view.View.LAYER_TYPE_HARDWARE
 import android.view.WindowManager
 import android.widget.Toast
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.viewModels
-import androidx.compose.foundation.background
-import androidx.compose.foundation.focusable
-import androidx.compose.foundation.gestures.awaitEachGesture
-import androidx.compose.foundation.gestures.awaitFirstDown
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.WindowInsets
-import androidx.compose.foundation.layout.displayCutout
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.navigationBarsPadding
-import androidx.compose.foundation.layout.systemBars
-import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.CompositionLocalProvider
-import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.key
-import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.focus.FocusRequester
-import androidx.compose.ui.focus.focusRequester
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.ColorFilter
-import androidx.compose.ui.graphics.ColorMatrix
-import androidx.compose.ui.input.key.Key
-import androidx.compose.ui.input.key.KeyEvent
-import androidx.compose.ui.input.key.KeyEventType
-import androidx.compose.ui.input.key.isCtrlPressed
-import androidx.compose.ui.input.key.key
-import androidx.compose.ui.input.key.onPreviewKeyEvent
-import androidx.compose.ui.input.key.type
-import androidx.compose.ui.input.pointer.PointerEventPass
-import androidx.compose.ui.input.pointer.pointerInput
-import androidx.compose.ui.keepScreenOn
 import androidx.compose.ui.unit.dp
 import androidx.core.content.getSystemService
+import androidx.core.graphics.Insets
 import androidx.core.net.toUri
+import androidx.core.transition.doOnEnd
+import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
 import androidx.lifecycle.lifecycleScope
-import androidx.lifecycle.viewmodel.initializer
-import androidx.lifecycle.viewmodel.viewModelFactory
+import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
+import com.google.android.material.transition.platform.MaterialContainerTransform
+import com.hippo.unifile.UniFile
 import dev.zacsweers.metro.Inject
 import eu.kanade.domain.base.BasePreferences
 import eu.kanade.presentation.reader.DisplayRefreshHost
 import eu.kanade.presentation.reader.OrientationSelectDialog
 import eu.kanade.presentation.reader.ReaderContentOverlay
-import eu.kanade.presentation.reader.ReaderNavigationOverlay
-import eu.kanade.presentation.reader.ReaderNavigationOverlayState
 import eu.kanade.presentation.reader.ReaderPageActionsDialog
 import eu.kanade.presentation.reader.ReaderPageIndicator
 import eu.kanade.presentation.reader.ReadingModeSelectDialog
@@ -77,8 +58,10 @@ import eu.kanade.presentation.reader.appbars.ReaderAppBars
 import eu.kanade.presentation.reader.components.ChapterNavigatorType
 import eu.kanade.presentation.reader.settings.ReaderSettingsDialog
 import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.coil.ImageDecoder
 import eu.kanade.tachiyomi.data.notification.NotificationReceiver
 import eu.kanade.tachiyomi.data.notification.Notifications
+import eu.kanade.tachiyomi.databinding.ReaderActivityBinding
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.ui.base.activity.BaseActivity
 import eu.kanade.tachiyomi.ui.main.MainActivity
@@ -92,10 +75,8 @@ import eu.kanade.tachiyomi.ui.reader.setting.ReaderOrientation
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderSettingsViewModel
 import eu.kanade.tachiyomi.ui.reader.setting.ReadingMode
-import eu.kanade.tachiyomi.ui.reader.viewer.LocalPageColorFilter
-import eu.kanade.tachiyomi.ui.reader.viewer.Viewer
-import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation.Action
-import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation.NavigationRegion
+import eu.kanade.tachiyomi.ui.reader.viewer.ReaderProgressIndicator
+import eu.kanade.tachiyomi.ui.reader.viewer.pager.R2LPagerViewer
 import eu.kanade.tachiyomi.ui.webview.WebViewActivity
 import eu.kanade.tachiyomi.util.system.openInBrowser
 import eu.kanade.tachiyomi.util.system.readerBackgroundColor
@@ -103,13 +84,14 @@ import eu.kanade.tachiyomi.util.system.toShareIntent
 import eu.kanade.tachiyomi.util.system.toast
 import eu.kanade.tachiyomi.util.view.setComposeContent
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.drop
 import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.sample
 import kotlinx.coroutines.launch
 import logcat.LogPriority
 import mihon.app.di.AppGraph
@@ -118,8 +100,9 @@ import tachiyomi.core.common.Constants
 import tachiyomi.core.common.i18n.stringResource
 import tachiyomi.core.common.util.system.logcat
 import tachiyomi.i18n.MR
-import tachiyomi.presentation.core.screens.LoadingScreen
 import tachiyomi.presentation.core.util.collectAsState
+import java.io.ByteArrayOutputStream
+import kotlin.time.Duration.Companion.seconds
 
 class ReaderActivity : BaseActivity() {
 
@@ -139,26 +122,23 @@ class ReaderActivity : BaseActivity() {
 
     @Inject private lateinit var preferences: BasePreferences
 
+    lateinit var binding: ReaderActivityBinding
+
     val viewModel by viewModels<ReaderViewModel> { graph.viewModelFactory }
-    val settingsViewModel by viewModels<ReaderSettingsViewModel> {
-        viewModelFactory { initializer { ReaderSettingsViewModel(viewModel, readerPreferences, preferences) } }
-    }
     private var assistUrl: String? = null
 
+    /**
+     * Configuration at reader level, like background color or forced orientation.
+     */
+    private var config: ReaderConfig? = null
+
     private var menuToggleToast: Toast? = null
     private var readingModeToast: Toast? = null
     private val displayRefreshHost = DisplayRefreshHost()
-    private val navigationOverlayState = ReaderNavigationOverlayState()
 
     private val windowInsetsController by lazy { WindowInsetsControllerCompat(window, window.decorView) }
 
-    private var isLoadingViewer by mutableStateOf(false)
-
-    /**
-     * Viewer used to display the pages (pager, webtoon, ...).
-     */
-    private val viewerFlow = MutableStateFlow<Viewer?>(null)
-    private val viewer: Viewer? inline get() = viewerFlow.value
+    private var loadingIndicator: ReaderProgressIndicator? = null
 
     var isScrollingThroughPages = false
         private set
@@ -188,140 +168,9 @@ class ReaderActivity : BaseActivity() {
 
         super.onCreate(savedInstanceState)
 
-        setComposeContent {
-            val state by viewModel.state.collectAsState()
-            val general by settingsViewModel.general.collectAsState()
-            val showPageNumber by readerPreferences.showPageNumber.collectAsState()
-            val flashOnPageChange by readerPreferences.flashOnPageChange.collectAsState()
-            val colorOverlayEnabled by readerPreferences.colorFilter.collectAsState()
-            val colorOverlay by readerPreferences.colorFilterValue.collectAsState()
-            val colorOverlayMode by readerPreferences.colorFilterMode.collectAsState()
-            val brightness by settingsViewModel.brightness.collectAsState()
-            val navigation = settingsViewModel.navigation.collectAsState().value
-
-            val backgroundColor = remember(general.theme) { Color(baseContext.readerBackgroundColor(general.theme)) }
-            val colorOverlayBlendMode = remember(colorOverlayMode) {
-                ReaderPreferences.ColorFilterMode.getOrNull(colorOverlayMode)?.second
-            }
-
-            LaunchedEffect(brightness) { setWindowBrightness(brightness) }
-
-            val forceNavigationOverlay = remember { settingsViewModel.takeNavigationOverlayForNewUser() }
-            LaunchedEffect(navigation) {
-                if (navigation == null) return@LaunchedEffect
-                val showOnStart = forceNavigationOverlay || settingsViewModel.general.value.navigationOverlayOnStart
-                navigationOverlayState.setNavigation(navigation, showOnStart)
-            }
-
-            val focusRequester = remember { FocusRequester() }
-            LaunchedEffect(Unit) { focusRequester.requestFocus() }
-
-            Box(
-                modifier = Modifier
-                    .fillMaxSize()
-                    .background(backgroundColor)
-                    .onPreviewKeyEvent(::onKeyEvent)
-                    .focusRequester(focusRequester)
-                    .focusable()
-                    .pointerInput(Unit) {
-                        awaitEachGesture {
-                            awaitFirstDown(requireUnconsumed = false, pass = PointerEventPass.Initial)
-                            navigationOverlayState.hide()
-                        }
-                    }
-                    .then(if (general.keepScreenOn) Modifier.keepScreenOn() else Modifier),
-            ) {
-                ReaderViewer()
-
-                if (isLoadingViewer) {
-                    LoadingScreen()
-                    return@Box
-                }
-
-                ReaderContentOverlay(
-                    brightness = brightness,
-                    color = colorOverlay.takeIf { colorOverlayEnabled },
-                    colorBlendMode = colorOverlayBlendMode,
-                )
-
-                if (!state.menuVisible && showPageNumber) {
-                    ReaderPageIndicator(
-                        currentPage = state.currentPage,
-                        totalPages = state.totalPages,
-                        modifier = Modifier
-                            .align(Alignment.BottomCenter)
-                            .navigationBarsPadding(),
-                    )
-                }
-
-                if (flashOnPageChange) {
-                    DisplayRefreshHost(hostState = displayRefreshHost)
-                }
-
-                ReaderNavigationOverlay(state = navigationOverlayState)
-
-                AppBars(state = state)
-            }
-
-            if (state.isLoadingAdjacentChapter) {
-                AlertDialog(
-                    onDismissRequest = {},
-                    confirmButton = {},
-                    text = {
-                        Row(
-                            horizontalArrangement = Arrangement.spacedBy(16.dp),
-                            verticalAlignment = Alignment.CenterVertically,
-                        ) {
-                            CircularProgressIndicator()
-                            Text(stringResource(MR.strings.loading))
-                        }
-                    },
-                )
-            }
-
-            val onDismissRequest = viewModel::closeDialog
-            when (state.dialog) {
-                is ReaderViewModel.Dialog.Settings -> {
-                    ReaderSettingsDialog(
-                        onDismissRequest = onDismissRequest,
-                        onShowMenus = { setMenuVisibility(true) },
-                        onHideMenus = { setMenuVisibility(false) },
-                        viewModel = settingsViewModel,
-                    )
-                }
-                is ReaderViewModel.Dialog.ReadingModeSelect -> {
-                    ReadingModeSelectDialog(
-                        onDismissRequest = onDismissRequest,
-                        viewModel = settingsViewModel,
-                        onChange = { stringRes ->
-                            menuToggleToast?.cancel()
-                            if (!readerPreferences.showReadingMode.get()) {
-                                menuToggleToast = toast(stringRes)
-                            }
-                        },
-                    )
-                }
-                is ReaderViewModel.Dialog.OrientationModeSelect -> {
-                    OrientationSelectDialog(
-                        onDismissRequest = onDismissRequest,
-                        viewModel = settingsViewModel,
-                        onChange = { stringRes ->
-                            menuToggleToast?.cancel()
-                            menuToggleToast = toast(stringRes)
-                        },
-                    )
-                }
-                is ReaderViewModel.Dialog.PageActions -> {
-                    ReaderPageActionsDialog(
-                        onDismissRequest = onDismissRequest,
-                        onSetAsCover = viewModel::setAsCover,
-                        onShare = viewModel::shareImage,
-                        onSave = viewModel::saveImage,
-                    )
-                }
-                null -> {}
-            }
-        }
+        binding = ReaderActivityBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        binding.setComposeOverlay()
 
         if (!viewModel.hasValidArgs) {
             finish()
@@ -334,6 +183,7 @@ class ReaderActivity : BaseActivity() {
             Notifications.ID_NEW_CHAPTERS,
         )
 
+        config = ReaderConfig()
         setMenuVisibility(viewModel.state.value.menuVisible)
 
         // Finish when incognito mode is disabled
@@ -349,6 +199,12 @@ class ReaderActivity : BaseActivity() {
             .onEach(::setInitialChapterError)
             .launchIn(lifecycleScope)
 
+        viewModel.state
+            .map { it.isLoadingAdjacentChapter }
+            .distinctUntilChanged()
+            .onEach(::setProgressDialog)
+            .launchIn(lifecycleScope)
+
         viewModel.state
             .map { it.manga }
             .distinctUntilChanged()
@@ -392,12 +248,100 @@ class ReaderActivity : BaseActivity() {
             .launchIn(lifecycleScope)
     }
 
+    private fun ReaderActivityBinding.setComposeOverlay(): Unit = composeOverlay.setComposeContent {
+        val state by viewModel.state.collectAsState()
+        val showPageNumber by readerPreferences.showPageNumber.collectAsState()
+        val settingsviewModel = remember {
+            ReaderSettingsViewModel(
+                readerState = viewModel.state,
+                onChangeReadingMode = viewModel::setMangaReadingMode,
+                onChangeOrientation = viewModel::setMangaOrientationType,
+                preferences = readerPreferences,
+            )
+        }
+
+        Box(modifier = Modifier.fillMaxSize()) {
+            if (!state.menuVisible && showPageNumber) {
+                ReaderPageIndicator(
+                    currentPage = state.currentPage,
+                    totalPages = state.totalPages,
+                    modifier = Modifier
+                        .align(Alignment.BottomCenter)
+                        .navigationBarsPadding(),
+                )
+            }
+
+            ContentOverlay(state = state)
+
+            AppBars(state = state)
+        }
+
+        val onDismissRequest = viewModel::closeDialog
+        when (state.dialog) {
+            is ReaderViewModel.Dialog.Loading -> {
+                AlertDialog(
+                    onDismissRequest = {},
+                    confirmButton = {},
+                    text = {
+                        Row(
+                            horizontalArrangement = Arrangement.spacedBy(16.dp),
+                            verticalAlignment = Alignment.CenterVertically,
+                        ) {
+                            CircularProgressIndicator()
+                            Text(stringResource(MR.strings.loading))
+                        }
+                    },
+                )
+            }
+            is ReaderViewModel.Dialog.Settings -> {
+                ReaderSettingsDialog(
+                    onDismissRequest = onDismissRequest,
+                    onShowMenus = { setMenuVisibility(true) },
+                    onHideMenus = { setMenuVisibility(false) },
+                    viewModel = settingsviewModel,
+                )
+            }
+            is ReaderViewModel.Dialog.ReadingModeSelect -> {
+                ReadingModeSelectDialog(
+                    onDismissRequest = onDismissRequest,
+                    viewModel = settingsviewModel,
+                    onChange = { stringRes ->
+                        menuToggleToast?.cancel()
+                        if (!readerPreferences.showReadingMode.get()) {
+                            menuToggleToast = toast(stringRes)
+                        }
+                    },
+                )
+            }
+            is ReaderViewModel.Dialog.OrientationModeSelect -> {
+                OrientationSelectDialog(
+                    onDismissRequest = onDismissRequest,
+                    viewModel = settingsviewModel,
+                    onChange = { stringRes ->
+                        menuToggleToast?.cancel()
+                        menuToggleToast = toast(stringRes)
+                    },
+                )
+            }
+            is ReaderViewModel.Dialog.PageActions -> {
+                ReaderPageActionsDialog(
+                    onDismissRequest = onDismissRequest,
+                    onSetAsCover = viewModel::setAsCover,
+                    onShare = viewModel::shareImage,
+                    onSave = viewModel::saveImage,
+                )
+            }
+            null -> {}
+        }
+    }
+
     /**
-     * Called when the activity is destroyed. Cleans up the viewer and any view.
+     * Called when the activity is destroyed. Cleans up the viewer, configuration and any view.
      */
     override fun onDestroy() {
         super.onDestroy()
-        viewer?.destroy()
+        viewModel.state.value.viewer?.destroy()
+        config = null
         menuToggleToast?.cancel()
         readingModeToast?.cancel()
     }
@@ -452,97 +396,59 @@ class ReaderActivity : BaseActivity() {
         }
     }
 
+    override fun onKeyUp(keyCode: Int, event: KeyEvent?): Boolean {
+        if (keyCode == KeyEvent.KEYCODE_N) {
+            loadNextChapter()
+            return true
+        } else if (keyCode == KeyEvent.KEYCODE_P) {
+            loadPreviousChapter()
+            return true
+        }
+        return super.onKeyUp(keyCode, event)
+    }
+
+    /**
+     * Dispatches a key event. If the viewer doesn't handle it, call the default implementation.
+     */
+    override fun dispatchKeyEvent(event: KeyEvent): Boolean {
+        val handled = viewModel.state.value.viewer?.handleKeyEvent(event) ?: false
+        return handled || super.dispatchKeyEvent(event)
+    }
+
+    /**
+     * Dispatches a generic motion event. If the viewer doesn't handle it, call the default
+     * implementation.
+     */
+    override fun dispatchGenericMotionEvent(event: MotionEvent): Boolean {
+        val handled = viewModel.state.value.viewer?.handleGenericMotionEvent(event) ?: false
+        return handled || super.dispatchGenericMotionEvent(event)
+    }
+
     @Composable
-    private fun ReaderViewer() {
-        val viewer by viewerFlow.collectAsState()
-        val general by settingsViewModel.general.collectAsState()
-        val insets = when {
-            !general.fullscreen -> WindowInsets.systemBars
-            !general.drawUnderCutout -> WindowInsets.displayCutout
-            else -> WindowInsets(0)
-        }
-        val colorFilter = remember(general.grayscale, general.invertedColors) {
-            viewerColorFilter(general.grayscale, general.invertedColors)
+    private fun ContentOverlay(state: ReaderViewModel.State) {
+        val flashOnPageChange by readerPreferences.flashOnPageChange.collectAsState()
+
+        val colorOverlayEnabled by readerPreferences.colorFilter.collectAsState()
+        val colorOverlay by readerPreferences.colorFilterValue.collectAsState()
+        val colorOverlayMode by readerPreferences.colorFilterMode.collectAsState()
+        val colorOverlayBlendMode = remember(colorOverlayMode) {
+            ReaderPreferences.ColorFilterMode.getOrNull(colorOverlayMode)?.second
         }
 
-        // Each viewer filters its page images alone: transition, loading and error pages keep their colours.
-        CompositionLocalProvider(LocalPageColorFilter provides colorFilter) {
-            key(viewer) {
-                viewer?.Content(
-                    modifier = Modifier
-                        .fillMaxSize()
-                        .windowInsetsPadding(insets),
-                )
-            }
-        }
-    }
+        ReaderContentOverlay(
+            brightness = state.brightnessOverlayValue,
+            color = colorOverlay.takeIf { colorOverlayEnabled },
+            colorBlendMode = colorOverlayBlendMode,
+        )
 
-    /**
-     * Handles a key [event] before anything else in the reader. Movement happens on key up.
-     */
-    private fun onKeyEvent(event: KeyEvent): Boolean {
-        val viewer = viewer ?: return false
-        val navigation = settingsViewModel.navigation.value ?: return false
-        val isUp = event.type == KeyEventType.KeyUp
-        val action = when (event.key) {
-            Key.VolumeDown, Key.VolumeUp -> {
-                val general = settingsViewModel.general.value
-                if (!general.volumeKeysEnabled || viewModel.state.value.menuVisible) return false
-                if ((event.key == Key.VolumeDown) != general.volumeKeysInverted) Action.FORWARD else Action.BACKWARD
-            }
-            Key.DirectionRight -> if (event.isCtrlPressed) {
-                Action.FORWARD
-            } else {
-                navigation.actionOf(
-                    NavigationRegion.RIGHT,
-                )
-            }
-            Key.DirectionLeft -> if (event.isCtrlPressed) {
-                Action.BACKWARD
-            } else {
-                navigation.actionOf(
-                    NavigationRegion.LEFT,
-                )
-            }
-            Key.DirectionDown, Key.PageDown -> Action.FORWARD
-            Key.DirectionUp, Key.PageUp -> Action.BACKWARD
-            Key.Menu -> Action.MENU
-            Key.N -> {
-                if (isUp) loadNextChapter()
-                return true
-            }
-            Key.P -> {
-                if (isUp) loadPreviousChapter()
-                return true
-            }
-            else -> return false
-        }
-        if (isUp) {
-            when (action) {
-                Action.MENU -> toggleMenu()
-                Action.FORWARD -> viewer.moveForward()
-                Action.BACKWARD -> viewer.moveBackward()
-            }
-        }
-        return true
-    }
-
-    /**
-     * Called from the viewer when it's tapped at [pos], given as a fraction of its size.
-     */
-    fun onViewerTap(pos: Offset) {
-        val action = settingsViewModel.navigation.value?.getAction(pos) ?: Action.MENU
-        when (action) {
-            Action.MENU -> toggleMenu()
-            Action.FORWARD -> viewer?.moveForward()
-            Action.BACKWARD -> viewer?.moveBackward()
+        if (flashOnPageChange) {
+            DisplayRefreshHost(hostState = displayRefreshHost)
         }
     }
 
     @Composable
     fun AppBars(state: ReaderViewModel.State) {
         val isHttpSource = state.source is HttpSource
-        val readingMode = ReadingMode.fromPreference(viewModel.getMangaReadingMode())
 
         val cropBorderPaged by readerPreferences.cropBorders.collectAsState()
         val cropBorderWebtoon by readerPreferences.cropBordersWebtoon.collectAsState()
@@ -550,7 +456,9 @@ class ReaderActivity : BaseActivity() {
         val cropEnabled = if (isPagerType) cropBorderPaged else cropBorderWebtoon
 
         val verticalNavigatorModes by readerPreferences.verticalNavigator.collectAsState()
-        val verticalNavigator = verticalNavigatorModes.contains(readingMode)
+        val verticalNavigator = verticalNavigatorModes.contains(
+            ReadingMode.fromPreference(viewModel.getMangaReadingMode()),
+        )
         val verticalNavigatorOnLeft by readerPreferences.verticalNavigatorOnLeft.collectAsState()
         val verticalNavigatorHeight by readerPreferences.verticalNavigatorHeight.collectAsState()
 
@@ -568,7 +476,7 @@ class ReaderActivity : BaseActivity() {
             onShare = ::shareChapter.takeIf { isHttpSource },
 
             chapterNavigatorType = if (!verticalNavigator) {
-                if (readingMode == ReadingMode.RIGHT_TO_LEFT) {
+                if (state.viewer is R2LPagerViewer) {
                     ChapterNavigatorType.HORIZONTAL_RTL
                 } else {
                     ChapterNavigatorType.HORIZONTAL_LTR
@@ -629,22 +537,35 @@ class ReaderActivity : BaseActivity() {
      * Called from the presenter when a manga is ready. Used to instantiate the appropriate viewer.
      */
     private fun updateViewer() {
-        val prevViewer = viewer
-        val readingMode = viewModel.getMangaReadingMode()
-        settingsViewModel.setViewerReadingMode(ReadingMode.fromPreference(readingMode))
-        val newViewer = ReadingMode.toViewer(readingMode, this)
+        val prevViewer = viewModel.state.value.viewer
+        val newViewer = ReadingMode.toViewer(viewModel.getMangaReadingMode(), this)
 
-        setOrientation(viewModel.getMangaOrientation())
+        if (window.sharedElementEnterTransition is MaterialContainerTransform) {
+            // Wait until transition is complete to avoid crash on API 26
+            window.sharedElementEnterTransition.doOnEnd {
+                setOrientation(viewModel.getMangaOrientation())
+            }
+        } else {
+            setOrientation(viewModel.getMangaOrientation())
+        }
 
         // Destroy previous viewer if there was one
-        prevViewer?.destroy()
-        viewerFlow.value = newViewer
+        if (prevViewer != null) {
+            prevViewer.destroy()
+            binding.viewerContainer.removeAllViews()
+        }
+        viewModel.onViewerLoaded(newViewer)
+        updateViewerInset(readerPreferences.fullscreen.get(), readerPreferences.drawUnderCutout.get())
+        binding.viewerContainer.addView(newViewer.getView())
 
         if (readerPreferences.showReadingMode.get()) {
             showReadingModeToast(viewModel.getMangaReadingMode())
         }
 
-        isLoadingViewer = true
+        loadingIndicator = ReaderProgressIndicator(this)
+        binding.readerContainer.addView(loadingIndicator)
+
+        startPostponedEnterTransition()
     }
 
     private fun openMangaScreen() {
@@ -695,9 +616,10 @@ class ReaderActivity : BaseActivity() {
      * method to the current viewer, but also set the subtitle on the toolbar, and
      * hides or disables the reader prev/next buttons if there's a prev or next chapter
      */
+    @SuppressLint("RestrictedApi")
     private fun setChapters(viewerChapters: ViewerChapters) {
-        isLoadingViewer = false
-        viewer?.setChapters(viewerChapters)
+        binding.readerContainer.removeView(loadingIndicator)
+        viewModel.state.value.viewer?.setChapters(viewerChapters)
 
         lifecycleScope.launch(Dispatchers.IO) {
             viewModel.getChapterUrl()?.let { url ->
@@ -716,12 +638,26 @@ class ReaderActivity : BaseActivity() {
         toast(error.message)
     }
 
+    /**
+     * Called from the presenter whenever it's loading the next or previous chapter. It shows or
+     * dismisses a non-cancellable dialog to prevent user interaction according to the value of
+     * [show]. This is only used when the next/previous buttons on the toolbar are clicked; the
+     * other cases are handled with chapter transitions on the viewers and chapter preloading.
+     */
+    private fun setProgressDialog(show: Boolean) {
+        if (show) {
+            viewModel.showLoadingDialog()
+        } else {
+            viewModel.closeDialog()
+        }
+    }
+
     /**
      * Moves the viewer to the given page [index]. It does nothing if the viewer is null or the
      * page is not found.
      */
     private fun moveToPageIndex(index: Int) {
-        val viewer = this.viewer ?: return
+        val viewer = viewModel.state.value.viewer ?: return
         val currentChapter = viewModel.state.value.currentChapter ?: return
         val page = currentChapter.pages?.getOrNull(index) ?: return
         viewer.moveToPage(page)
@@ -860,41 +796,172 @@ class ReaderActivity : BaseActivity() {
     }
 
     /**
-     * Sets the brightness of the screen. Range is [-75, 100].
-     * From -75 to -1 the minimum brightness is used, and the overlay darkens further.
-     * From 1 to 100 it sets that value as brightness.
-     * 0 sets system brightness.
+     * Updates viewer inset depending on fullscreen reader preferences.
      */
-    private fun setWindowBrightness(value: Int) {
-        // Calculate and set reader brightness.
-        val readerBrightness = when {
-            value > 0 -> {
-                value / 100f
-            }
-            value < 0 -> {
-                0.01f
-            }
-            else -> WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE
-        }
-        window.attributes = window.attributes.apply { screenBrightness = readerBrightness }
-    }
-}
+    private fun updateViewerInset(fullscreen: Boolean, drawUnderCutout: Boolean) {
+        if (!::binding.isInitialized) return
+        val view = binding.viewerContainer
 
-private fun viewerColorFilter(grayscale: Boolean, invertedColors: Boolean): ColorFilter? {
-    if (!grayscale && !invertedColors) return null
-    val matrix = ColorMatrix()
-    if (invertedColors) {
-        matrix *= ColorMatrix(
-            floatArrayOf(
-                -1f, 0f, 0f, 0f, 255f,
-                0f, -1f, 0f, 0f, 255f,
-                0f, 0f, -1f, 0f, 255f,
-                0f, 0f, 0f, 1f, 0f,
-            ),
-        )
+        view.applyInsetsPadding(ViewCompat.getRootWindowInsets(view), fullscreen, drawUnderCutout)
+        ViewCompat.setOnApplyWindowInsetsListener(view) { view, windowInsets ->
+            view.applyInsetsPadding(windowInsets, fullscreen, drawUnderCutout)
+            windowInsets
+        }
     }
-    if (grayscale) {
-        matrix *= ColorMatrix().apply { setToSaturation(0f) }
+
+    private fun View.applyInsetsPadding(
+        windowInsets: WindowInsetsCompat?,
+        fullscreen: Boolean,
+        drawUnderCutout: Boolean,
+    ) {
+        val insets = when {
+            !fullscreen -> windowInsets?.getInsets(WindowInsetsCompat.Type.systemBars())
+            !drawUnderCutout -> windowInsets?.getInsets(WindowInsetsCompat.Type.displayCutout())
+            else -> null
+        }
+            ?: Insets.NONE
+
+        setPadding(insets.left, insets.top, insets.right, insets.bottom)
+    }
+
+    /**
+     * Class that handles the user preferences of the reader.
+     */
+    private inner class ReaderConfig {
+
+        private fun getCombinedPaint(grayscale: Boolean, invertedColors: Boolean): Paint {
+            return Paint().apply {
+                colorFilter = ColorMatrixColorFilter(
+                    ColorMatrix().apply {
+                        if (grayscale) {
+                            setSaturation(0f)
+                        }
+                        if (invertedColors) {
+                            postConcat(
+                                ColorMatrix(
+                                    floatArrayOf(
+                                        -1f, 0f, 0f, 0f, 255f,
+                                        0f, -1f, 0f, 0f, 255f,
+                                        0f, 0f, -1f, 0f, 255f,
+                                        0f, 0f, 0f, 1f, 0f,
+                                    ),
+                                ),
+                            )
+                        }
+                    },
+                )
+            }
+        }
+
+        /*
+         * Initializes the reader subscriptions.
+         */
+        init {
+            readerPreferences.readerTheme.changes()
+                .onEach { theme ->
+                    binding.readerContainer.setBackgroundColor(baseContext.readerBackgroundColor(theme))
+                }
+                .launchIn(lifecycleScope)
+
+            preferences.displayProfile.changes()
+                .onEach { setDisplayProfile(it) }
+                .launchIn(lifecycleScope)
+
+            readerPreferences.keepScreenOn.changes()
+                .onEach(::setKeepScreenOn)
+                .launchIn(lifecycleScope)
+
+            readerPreferences.customBrightness.changes()
+                .onEach(::setCustomBrightness)
+                .launchIn(lifecycleScope)
+
+            combine(
+                readerPreferences.grayscale.changes(),
+                readerPreferences.invertedColors.changes(),
+            ) { grayscale, invertedColors -> grayscale to invertedColors }
+                .onEach { (grayscale, invertedColors) ->
+                    setLayerPaint(grayscale, invertedColors)
+                }
+                .launchIn(lifecycleScope)
+
+            combine(
+                readerPreferences.fullscreen.changes(),
+                readerPreferences.drawUnderCutout.changes(),
+            ) { fullscreen, drawUnderCutout -> fullscreen to drawUnderCutout }
+                .onEach { (fullscreen, drawUnderCutout) ->
+                    updateViewerInset(fullscreen, drawUnderCutout)
+                }
+                .launchIn(lifecycleScope)
+        }
+
+        /**
+         * Sets the display profile to [path].
+         */
+        private fun setDisplayProfile(path: String) {
+            val file = UniFile.fromUri(baseContext, path.toUri())
+            if (file != null && file.exists()) {
+                val inputStream = file.openInputStream()
+                val outputStream = ByteArrayOutputStream()
+                inputStream.use { input ->
+                    outputStream.use { output ->
+                        input.copyTo(output)
+                    }
+                }
+                val data = outputStream.toByteArray()
+                SubsamplingScaleImageView.setDisplayProfile(data)
+                ImageDecoder.displayProfile = data
+            }
+        }
+
+        /**
+         * Sets the keep screen on mode according to [enabled].
+         */
+        private fun setKeepScreenOn(enabled: Boolean) {
+            if (enabled) {
+                window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+            } else {
+                window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+            }
+        }
+
+        /**
+         * Sets the custom brightness overlay according to [enabled].
+         */
+        private fun setCustomBrightness(enabled: Boolean) {
+            if (enabled) {
+                readerPreferences.customBrightnessValue.changes()
+                    .sample(0.1.seconds)
+                    .onEach(::setCustomBrightnessValue)
+                    .launchIn(lifecycleScope)
+            } else {
+                setCustomBrightnessValue(0)
+            }
+        }
+
+        /**
+         * Sets the brightness of the screen. Range is [-75, 100].
+         * From -75 to -1 a semi-transparent black view is overlaid with the minimum brightness.
+         * From 1 to 100 it sets that value as brightness.
+         * 0 sets system brightness and hides the overlay.
+         */
+        private fun setCustomBrightnessValue(value: Int) {
+            // Calculate and set reader brightness.
+            val readerBrightness = when {
+                value > 0 -> {
+                    value / 100f
+                }
+                value < 0 -> {
+                    0.01f
+                }
+                else -> WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE
+            }
+            window.attributes = window.attributes.apply { screenBrightness = readerBrightness }
+
+            viewModel.setBrightnessOverlayValue(value)
+        }
+        private fun setLayerPaint(grayscale: Boolean, invertedColors: Boolean) {
+            val paint = if (grayscale || invertedColors) getCombinedPaint(grayscale, invertedColors) else null
+            binding.viewerContainer.setLayerType(LAYER_TYPE_HARDWARE, paint)
+        }
     }
-    return ColorFilter.colorMatrix(matrix)
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderNavigationOverlayView.kt

@@ -0,0 +1,113 @@
+package eu.kanade.tachiyomi.ui.reader
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.util.AttributeSet
+import android.view.MotionEvent
+import android.view.View
+import android.view.ViewPropertyAnimator
+import androidx.core.graphics.withScale
+import androidx.core.graphics.withTranslation
+import androidx.core.view.isVisible
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.DisabledNavigation
+import tachiyomi.core.common.i18n.stringResource
+import kotlin.math.abs
+
+class ReaderNavigationOverlayView(context: Context, attributeSet: AttributeSet) : View(context, attributeSet) {
+
+    private var viewPropertyAnimator: ViewPropertyAnimator? = null
+
+    private var navigation: ViewerNavigation? = null
+
+    fun setNavigation(navigation: ViewerNavigation, showOnStart: Boolean) {
+        val firstLaunch = this.navigation == null
+        this.navigation = navigation
+        invalidate()
+
+        if (isVisible || (!showOnStart && firstLaunch) || navigation is DisabledNavigation) {
+            return
+        }
+
+        viewPropertyAnimator = animate()
+            .alpha(1f)
+            .setDuration(FADE_DURATION)
+            .withStartAction {
+                isVisible = true
+            }
+            .withEndAction {
+                viewPropertyAnimator = null
+            }
+        viewPropertyAnimator?.start()
+    }
+
+    private val regionPaint = Paint()
+
+    private val textPaint = Paint().apply {
+        textAlign = Paint.Align.CENTER
+        color = Color.WHITE
+        textSize = 64f
+    }
+
+    private val textBorderPaint = Paint().apply {
+        textAlign = Paint.Align.CENTER
+        color = Color.BLACK
+        textSize = 64f
+        style = Paint.Style.STROKE
+        strokeWidth = 8f
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        if (navigation == null) return
+
+        navigation?.getRegions()?.forEach { region ->
+            val rect = region.rectF
+
+            // Scale rect from 1f,1f to screen width and height
+            canvas.withScale(width.toFloat(), height.toFloat()) {
+                regionPaint.color = region.type.color
+                drawRect(rect, regionPaint)
+            }
+
+            // Don't want scale anymore because it messes with drawText
+            // Translate origin to rect start (left, top)
+            canvas.withTranslation(x = (width * rect.left), y = (height * rect.top)) {
+                // Calculate center of rect width on screen
+                val x = width * (abs(rect.left - rect.right) / 2)
+
+                // Calculate center of rect height on screen
+                val y = height * (abs(rect.top - rect.bottom) / 2)
+
+                drawText(context.stringResource(region.type.nameRes), x, y, textBorderPaint)
+                drawText(context.stringResource(region.type.nameRes), x, y, textPaint)
+            }
+        }
+    }
+
+    override fun performClick(): Boolean {
+        super.performClick()
+
+        if (viewPropertyAnimator == null && isVisible) {
+            viewPropertyAnimator = animate()
+                .alpha(0f)
+                .setDuration(FADE_DURATION)
+                .withEndAction {
+                    isVisible = false
+                    viewPropertyAnimator = null
+                }
+            viewPropertyAnimator?.start()
+        }
+
+        return true
+    }
+
+    override fun onTouchEvent(event: MotionEvent?): Boolean {
+        // Hide overlay if user start tapping or swiping
+        performClick()
+        return super.onTouchEvent(event)
+    }
+}
+
+private const val FADE_DURATION = 1000L

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderViewModel.kt

@@ -2,6 +2,7 @@ package eu.kanade.tachiyomi.ui.reader
 
 import android.content.Context
 import android.net.Uri
+import androidx.annotation.IntRange
 import androidx.compose.runtime.Immutable
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.ViewModel
@@ -24,6 +25,7 @@ import eu.kanade.domain.manga.model.readingMode
 import eu.kanade.domain.source.interactor.GetIncognitoState
 import eu.kanade.domain.track.interactor.TrackChapter
 import eu.kanade.domain.track.service.TrackPreferences
+import eu.kanade.tachiyomi.data.cache.ChapterCache
 import eu.kanade.tachiyomi.data.cache.CoverCache
 import eu.kanade.tachiyomi.data.download.DownloadCache
 import eu.kanade.tachiyomi.data.download.DownloadManager
@@ -45,6 +47,7 @@ import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderOrientation
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
 import eu.kanade.tachiyomi.ui.reader.setting.ReadingMode
+import eu.kanade.tachiyomi.ui.reader.viewer.Viewer
 import eu.kanade.tachiyomi.util.chapter.filterDownloaded
 import eu.kanade.tachiyomi.util.chapter.removeDuplicates
 import eu.kanade.tachiyomi.util.editCover
@@ -75,7 +78,6 @@ import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withContext
 import logcat.LogPriority
 import mihon.core.metro.AppCoroutineScope
-import mihon.data.cache.ChapterCache
 import tachiyomi.core.common.preference.toggle
 import tachiyomi.core.common.util.system.logcat
 import tachiyomi.domain.chapter.interactor.GetChaptersByMangaId
@@ -525,6 +527,12 @@ class ReaderViewModel(
         eventChannel.trySend(Event.ReloadViewerChapters)
     }
 
+    fun onViewerLoaded(viewer: Viewer?) {
+        mutableState.update {
+            it.copy(viewer = viewer)
+        }
+    }
+
     /**
      * Called every time a page changes on the reader. Used to mark the flag of chapters being
      * read, update tracking services, enqueue downloaded chapter deletion, and updating the active chapter if this
@@ -912,6 +920,10 @@ class ReaderViewModel(
         mutableState.update { it.copy(menuVisible = visible) }
     }
 
+    fun showLoadingDialog() {
+        mutableState.update { it.copy(dialog = Dialog.Loading) }
+    }
+
     fun openReadingModeSelectDialog() {
         mutableState.update { it.copy(dialog = Dialog.ReadingModeSelect) }
     }
@@ -932,6 +944,10 @@ class ReaderViewModel(
         mutableState.update { it.copy(dialog = null) }
     }
 
+    fun setBrightnessOverlayValue(value: Int) {
+        mutableState.update { it.copy(brightnessOverlayValue = value) }
+    }
+
     /**
      * Saves the image of the selected page on the pictures directory and notifies the UI of the result.
      * There's also a notification to allow sharing the image somewhere else or deleting it.
@@ -1094,8 +1110,14 @@ class ReaderViewModel(
         val bookmarked: Boolean = false,
         val isLoadingAdjacentChapter: Boolean = false,
         val currentPage: Int = -1,
+
+        /**
+         * Viewer used to display the pages (pager, webtoon, ...).
+         */
+        val viewer: Viewer? = null,
         val dialog: Dialog? = null,
         val menuVisible: Boolean = false,
+        @IntRange(from = -100, to = 100) val brightnessOverlayValue: Int = 0,
     ) {
         val currentChapter: ReaderChapter?
             get() = viewerChapters?.currChapter
@@ -1105,6 +1127,7 @@ class ReaderViewModel(
     }
 
     sealed interface Dialog {
+        data object Loading : Dialog
         data object Settings : Dialog
         data object ReadingModeSelect : Dialog
         data object OrientationModeSelect : Dialog

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ChapterLoader.kt

@@ -2,6 +2,7 @@ package eu.kanade.tachiyomi.ui.reader.loader
 
 import android.content.Context
 import eu.kanade.domain.chapter.model.toSChapter
+import eu.kanade.tachiyomi.data.cache.ChapterCache
 import eu.kanade.tachiyomi.data.download.DownloadManager
 import eu.kanade.tachiyomi.data.download.DownloadProvider
 import eu.kanade.tachiyomi.source.Source
@@ -12,7 +13,6 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import mihon.core.archive.archiveReader
 import mihon.core.archive.epubReader
-import mihon.data.cache.ChapterCache
 import tachiyomi.core.common.i18n.stringResource
 import tachiyomi.core.common.util.system.logcat
 import tachiyomi.domain.manga.model.Manga

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/HttpPageLoader.kt

@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.ui.reader.loader
 
 import eu.kanade.domain.chapter.model.toSChapter
+import eu.kanade.tachiyomi.data.cache.ChapterCache
 import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
@@ -15,8 +16,6 @@ import kotlinx.coroutines.cancel
 import kotlinx.coroutines.joinAll
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
-import mihon.data.cache.ChapterCache
-import java.io.FileNotFoundException
 import java.util.concurrent.ConcurrentHashMap
 
 /**
@@ -42,8 +41,14 @@ internal class HttpPageLoader(
      * otherwise fallbacks to network.
      */
     override suspend fun getPages(): List<ReaderPage> {
-        val pages = chapterCache.getPageList(chapter.chapter)
-            ?: source.getPageList(chapter.chapter.toSChapter())
+        val pages = try {
+            chapterCache.getPageListFromCache(chapter.chapter)
+        } catch (e: Throwable) {
+            if (e is CancellationException) {
+                throw e
+            }
+            source.getPageList(chapter.chapter.toSChapter())
+        }
         return pages.mapIndexed { index, page ->
             // Don't trust sources and use our own indexing
             ReaderPage(index, page.url, page.imageUrl).also {
@@ -109,7 +114,7 @@ internal class HttpPageLoader(
                 try {
                     // Convert to pages without reader information
                     val pagesToSave = pages.map { Page(it.index, it.url, it.imageUrl) }
-                    chapterCache.putPageList(chapter.chapter, pagesToSave)
+                    chapterCache.putPageListToCache(chapter.chapter, pagesToSave)
                 } catch (e: Throwable) {
                     if (e is CancellationException) {
                         throw e
@@ -225,32 +230,15 @@ internal class HttpPageLoader(
             }
             val imageUrl = page.imageUrl!!
 
-            val file = chapterCache.getImageFile(imageUrl).takeUnless { force } ?: run {
-                val live = page.downloadStream
+            if (force || !chapterCache.isImageInCache(imageUrl)) {
                 page.status = Page.State.DownloadImage
-                try {
-                    chapterCache.putImage(imageUrl, source.getImage(page), live)
-                        .also { live?.finish() }
-                } catch (e: Throwable) {
-                    live?.finish(e)
-                    throw e
-                }
+                val imageResponse = source.getImage(page)
+                chapterCache.putImageToCache(imageUrl, imageResponse)
             }
 
-            page.downloadStream = null
-            page.stream = {
-                try {
-                    file.inputStream()
-                } catch (e: FileNotFoundException) {
-                    // Gone from the cache since, so it's fetched again and shown once it's back
-                    page.status = Page.State.Queue
-                    launchLoadOnce(page)
-                    throw e
-                }
-            }
+            page.stream = { chapterCache.getImageFile(imageUrl).inputStream() }
             page.status = Page.State.Ready
         } catch (e: Throwable) {
-            page.downloadStream = null
             if (e is CancellationException) {
                 // Chunk chains get cancelled on every page turn, so a cancelled page isn't an error. Put it back in
                 // the queue, otherwise it's stuck in a state no later pass will pick up.

app/src/main/java/eu/kanade/tachiyomi/ui/reader/model/DownloadStream.kt

@@ -1,130 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.model
-
-import java.io.IOException
-import java.io.InputStream
-
-/**
- * A download's bytes as they arrive, for one reader. Past [MAX_BYTES], or once that reader is
- * closed, it stops keeping them; [append] never throws, so the download itself carries on.
- */
-class DownloadStream {
-    private val lock = Object()
-    private var data = ByteArray(1 shl 16)
-    private var size = 0
-    private var done = false
-    private var error: Throwable? = null
-
-    /** Presizes for [bytes], e.g. Content-Length; ignored if implausible. */
-    fun reserve(bytes: Long) {
-        synchronized(lock) {
-            if (error == null && bytes > data.size && bytes <= MAX_RESERVE) {
-                try {
-                    data = data.copyOf(bytes.toInt())
-                } catch (e: OutOfMemoryError) {
-                    // Only a hint.
-                }
-            }
-        }
-    }
-
-    fun append(src: ByteArray, offset: Int, length: Int) {
-        synchronized(lock) {
-            if (error != null || done) return
-            val needed = size.toLong() + length
-            if (needed > MAX_BYTES) {
-                // Too big to decode while downloading; the whole-file decode takes over.
-                drop("Download too large to stream")
-                return
-            }
-            if (needed > data.size) {
-                data = try {
-                    data.copyOf(maxOf(needed, minOf(data.size.toLong() * 2, MAX_BYTES)).toInt())
-                } catch (e: OutOfMemoryError) {
-                    // As too large: the download mustn't fail over this copy.
-                    drop("Out of memory buffering the download")
-                    return
-                }
-            }
-            System.arraycopy(src, offset, data, size, length)
-            size += length
-            lock.notifyAll()
-        }
-    }
-
-    /** Ends the bytes; readers throw [error] if given. */
-    fun finish(error: Throwable? = null) {
-        synchronized(lock) {
-            done = true
-            if (this.error == null) this.error = error
-            lock.notifyAll()
-        }
-    }
-
-    /** From the start; [Reader.read] blocks for bytes. Closing it drops what's kept. */
-    fun reader(): Reader = Reader()
-
-    // Rather than hold a second copy of the page.
-    private fun drop(why: String) {
-        if (error == null) error = IOException(why)
-        data = ByteArray(0)
-        size = 0
-        lock.notifyAll()
-    }
-
-    private companion object {
-        // As the decoder's own input limit.
-        const val MAX_BYTES = 1L shl 30
-        const val MAX_RESERVE = 64L shl 20
-    }
-
-    inner class Reader : InputStream() {
-        private var position = 0
-
-        /** All read; throws if the download failed. */
-        val ended: Boolean
-            get() = synchronized(lock) {
-                checkError()
-                done && position >= size
-            }
-
-        override fun read(): Int {
-            val b = ByteArray(1)
-            return if (read(b, 0, 1) < 0) -1 else b[0].toInt() and 0xFF
-        }
-
-        override fun read(b: ByteArray, off: Int, len: Int): Int {
-            synchronized(lock) {
-                if (len == 0) return 0
-                while (position >= size && !done && error == null) lock.wait()
-                checkError()
-                if (position >= size) return -1
-                val n = minOf(len, size - position)
-                System.arraycopy(data, position, b, off, n)
-                position += n
-                return n
-            }
-        }
-
-        override fun available(): Int = synchronized(lock) { if (error != null) 0 else size - position }
-
-        /** Waits up to [timeoutMs] for [min] unread bytes or the end. */
-        fun await(min: Int, timeoutMs: Long) {
-            synchronized(lock) {
-                val until = System.nanoTime() + timeoutMs * 1_000_000
-                while (size - position < min && !done && error == null) {
-                    val left = (until - System.nanoTime()) / 1_000_000
-                    if (left <= 0) return
-                    lock.wait(left)
-                }
-            }
-        }
-
-        override fun close() {
-            synchronized(lock) { drop("No longer read") }
-        }
-
-        private fun checkError() {
-            error?.let { throw IOException("Download failed", it) }
-        }
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/model/ReaderPage.kt

@@ -11,8 +11,4 @@ open class ReaderPage(
 ) : Page(index, url, imageUrl, null) {
 
     open lateinit var chapter: ReaderChapter
-
-    /** Set by a viewer before the download; filled during [Page.State.DownloadImage]. */
-    @Volatile
-    var downloadStream: DownloadStream? = null
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/setting/GeneralSettings.kt

@@ -1,23 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.setting
-
-/**
- * Settings for the reader as a whole and for every viewer alike.
- */
-data class GeneralSettings(
-    val theme: ReaderPreferences.ReaderTheme,
-    val keepScreenOn: Boolean,
-    val grayscale: Boolean,
-    val invertedColors: Boolean,
-    val fullscreen: Boolean,
-    val drawUnderCutout: Boolean,
-    val longTapEnabled: Boolean,
-    val usePageTransitions: Boolean,
-    val doubleTapAnimDuration: Int,
-    val volumeKeysEnabled: Boolean,
-    val volumeKeysInverted: Boolean,
-    val alwaysShowChapterTransition: Boolean,
-    val navigationOverlayOnStart: Boolean,
-) {
-    val automaticBackground: Boolean
-        get() = theme == ReaderPreferences.ReaderTheme.AUTOMATIC
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/setting/ReaderPreferences.kt

@@ -6,8 +6,6 @@ import dev.icerock.moko.resources.StringResource
 import dev.zacsweers.metro.AppScope
 import dev.zacsweers.metro.Inject
 import dev.zacsweers.metro.SingleIn
-import eu.kanade.tachiyomi.ui.reader.viewer.webgpu.WebGpuShader
-import eu.kanade.tachiyomi.ui.reader.viewer.webgpu.WebGpuShaders
 import tachiyomi.core.common.preference.Preference
 import tachiyomi.core.common.preference.PreferenceStore
 import tachiyomi.core.common.preference.getEnum
@@ -144,11 +142,6 @@ class ReaderPreferences(
         false,
     )
 
-    val dualPageView: Preference<DualPageView> = preferenceStore.getEnum(
-        "pref_dual_page_view",
-        DualPageView.NEVER,
-    )
-
     // endregion
 
     // region Color filter
@@ -206,43 +199,6 @@ class ReaderPreferences(
 
     // endregion
 
-    // region WebGpu
-
-    val transitionAnimation: Preference<TransitionAnimation> =
-        preferenceStore.getEnum("webgpu_transition_animation", TransitionAnimation.BASIC)
-
-    val transitionAnimationDual: Preference<TransitionAnimation> =
-        preferenceStore.getEnum("webgpu_dual_transition_animation", TransitionAnimation.BASIC)
-
-    val cutoutMode: Preference<CutoutMode> = preferenceStore.getEnum("webgpu_cutout_mode", CutoutMode.AVOID)
-
-    val cutoutModeDual: Preference<CutoutMode> = preferenceStore.getEnum("webgpu_dual_cutout_mode", CutoutMode.IGNORE)
-
-    val continuousMinWidth: Preference<Int> = preferenceStore.getInt("webgpu_continuous_minwidth", 100)
-
-    val continuousGap: Preference<Int> = preferenceStore.getInt("webgpu_continuous_gap", 10)
-
-    val disableDoubleTapGestures: Preference<Boolean> =
-        preferenceStore.getBoolean("webgpu_disable_double_tap_gestures", false)
-
-    /** In run order. */
-    val imageFilters: Preference<List<WebGpuShader>> = preferenceStore.getObjectFromString(
-        "webgpu_image_filters",
-        emptyList(),
-        WebGpuShaders::serialize,
-        WebGpuShaders::deserialize,
-    )
-
-    /** In run order. */
-    val tileFilters: Preference<List<WebGpuShader>> = preferenceStore.getObjectFromString(
-        "webgpu_tile_filters",
-        emptyList(),
-        WebGpuShaders::serialize,
-        WebGpuShaders::deserialize,
-    )
-
-    // endregion
-
     enum class FlashColor {
         BLACK,
         WHITE,
@@ -255,81 +211,11 @@ class ReaderPreferences(
         val shouldInvertVertical: Boolean = false,
     ) {
         NONE(MR.strings.tapping_inverted_none),
-        HORIZONTAL(
-            MR.strings.tapping_inverted_horizontal,
-            shouldInvertHorizontal = true,
-        ),
-        VERTICAL(
-            MR.strings.tapping_inverted_vertical,
-            shouldInvertVertical = true,
-        ),
+        HORIZONTAL(MR.strings.tapping_inverted_horizontal, shouldInvertHorizontal = true),
+        VERTICAL(MR.strings.tapping_inverted_vertical, shouldInvertVertical = true),
         BOTH(MR.strings.tapping_inverted_both, shouldInvertHorizontal = true, shouldInvertVertical = true),
     }
 
-    /**
-     * The [readerTheme] preference, stored as its [value].
-     */
-    enum class ReaderTheme(val value: Int) {
-        WHITE(0),
-        BLACK(1),
-        GRAY(2),
-        AUTOMATIC(3),
-        ;
-
-        companion object {
-            fun fromValue(value: Int) = entries.find { it.value == value } ?: BLACK
-        }
-    }
-
-    /**
-     * The [imageScaleType] preference, stored as its [value], which is also the scale type the image view takes.
-     */
-    enum class ScaleType(val value: Int) {
-        FIT_SCREEN(1),
-        STRETCH(2),
-        FIT_WIDTH(3),
-        FIT_HEIGHT(4),
-        ORIGINAL_SIZE(5),
-        SMART_FIT(6),
-        ;
-
-        companion object {
-            fun fromValue(value: Int) = entries.find { it.value == value } ?: FIT_SCREEN
-        }
-    }
-
-    /**
-     * The [zoomStart] preference, stored as its [value].
-     */
-    enum class ZoomStartType(val value: Int) {
-        AUTOMATIC(1),
-        LEFT(2),
-        RIGHT(3),
-        CENTER(4),
-        ;
-
-        companion object {
-            fun fromValue(value: Int) = entries.find { it.value == value } ?: CENTER
-        }
-    }
-
-    /**
-     * The [navigationModePager] and [navigationModeWebtoon] preferences, stored as their [value].
-     */
-    enum class NavigationMode(val value: Int) {
-        DEFAULT(0),
-        L_SHAPED(1),
-        KINDLISH(2),
-        EDGE(3),
-        RIGHT_AND_LEFT(4),
-        DISABLED(5),
-        ;
-
-        companion object {
-            fun fromValue(value: Int) = entries.find { it.value == value } ?: DEFAULT
-        }
-    }
-
     enum class ReaderHideThreshold(val threshold: Int) {
         HIGHEST(5),
         HIGH(13),
@@ -337,43 +223,6 @@ class ReaderPreferences(
         LOWEST(47),
     }
 
-    enum class TransitionAnimation(val titleRes: StringResource) {
-        BASIC(MR.strings.transition_animation_basic),
-        FLIP(MR.strings.transition_animation_flip),
-        FLIP_LEFT(MR.strings.transition_animation_flip_left),
-        FLIP_RIGHT(
-            MR.strings.transition_animation_flip_right,
-        ),
-        STACK_LEFT(MR.strings.transition_animation_stack_left),
-        STACK_RIGHT(MR.strings.transition_animation_stack_right),
-        STACK_UP(
-            MR.strings.transition_animation_stack_up,
-        ),
-        STACK_DOWN(MR.strings.transition_animation_stack_down),
-        SPHERE(MR.strings.transition_animation_sphere),
-        CUBE_INSIDE(
-            MR.strings.transition_animation_cube_inside,
-        ),
-        CUBE_OUTSIDE(MR.strings.transition_animation_cube_outside),
-        FADE(MR.strings.transition_animation_fade),
-        FADE_WHITE(
-            MR.strings.transition_animation_fade_white,
-        ),
-        NONE(MR.strings.transition_animation_none),
-    }
-
-    enum class CutoutMode(val titleRes: StringResource) {
-        IGNORE(MR.strings.cutout_mode_ignore),
-        AVOID(MR.strings.cutout_mode_avoid),
-        SHIFT(MR.strings.cutout_mode_shift),
-    }
-
-    enum class DualPageView(val titleRes: StringResource) {
-        NEVER(MR.strings.dual_page_view_never),
-        ALWAYS(MR.strings.dual_page_view_always),
-        WIDE(MR.strings.dual_page_view_wide),
-    }
-
     companion object {
         const val WEBTOON_PADDING_MIN = 0
         const val WEBTOON_PADDING_MAX = 25
@@ -398,13 +247,6 @@ class ReaderPreferences(
             MR.strings.scale_type_smart_fit,
         )
 
-        val ImageScaleTypeWebGpuViewer = listOf(
-            MR.strings.scale_type_fit_screen,
-            MR.strings.scale_type_fit_width,
-            MR.strings.scale_type_fit_height,
-            MR.strings.scale_type_original_size,
-        )
-
         val ZoomStart = listOf(
             MR.strings.zoom_start_automatic,
             MR.strings.zoom_start_left,

app/src/main/java/eu/kanade/tachiyomi/ui/reader/setting/ReaderSettingsViewModel.kt

@@ -2,317 +2,27 @@ package eu.kanade.tachiyomi.ui.reader.setting
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import eu.kanade.domain.base.BasePreferences
-import eu.kanade.domain.manga.model.readingMode
 import eu.kanade.tachiyomi.ui.reader.ReaderViewModel
-import eu.kanade.tachiyomi.ui.reader.viewer.LongStripSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.NavigationSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.PagedSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
-import eu.kanade.tachiyomi.ui.reader.viewer.navigation.LNavigation
-import eu.kanade.tachiyomi.ui.reader.viewer.navigation.RightAndLeftNavigation
-import eu.kanade.tachiyomi.ui.reader.viewer.pager.SimplePagedSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.webgpu.WebGpuLongStripSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.webgpu.WebGpuPagedSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.webgpu.WebGpuSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.webtoon.SimpleLongStripSettings
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.FlowPreview
-import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.distinctUntilChanged
-import kotlinx.coroutines.flow.flatMapLatest
-import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.map
-import kotlinx.coroutines.flow.merge
-import kotlinx.coroutines.flow.sample
 import kotlinx.coroutines.flow.stateIn
-import tachiyomi.core.common.preference.Preference
-import kotlin.time.Duration.Companion.seconds
 
-/**
- * The reader's settings, each as one value re-read whenever a preference it's made of changes, so the activity and
- * viewers apply a change in one place instead of each preference calling back.
- */
 class ReaderSettingsViewModel(
-    private val readerViewModel: ReaderViewModel,
+    readerState: StateFlow<ReaderViewModel.State>,
+    val onChangeReadingMode: (ReadingMode) -> Unit,
+    val onChangeOrientation: (ReaderOrientation) -> Unit,
     val preferences: ReaderPreferences,
-    private val basePreferences: BasePreferences,
 ) : ViewModel() {
 
-    val mangaFlow = readerViewModel.state
-        .map { it.manga }
+    val viewerFlow = readerState
+        .map { it.viewer }
         .distinctUntilChanged()
         .stateIn(viewModelScope, SharingStarted.Lazily, null)
 
-    /**
-     * The reading mode the viewer is made for, with the default resolved.
-     */
-    val readingMode = combine(mangaFlow, preferences.defaultReadingMode.changes()) { manga, default ->
-        ReadingMode.fromPreference(manga?.readingMode?.toInt())
-            .takeIf { it != ReadingMode.DEFAULT }
-            ?: ReadingMode.fromPreference(default)
-    }
-        .stateIn(
-            viewModelScope,
-            SharingStarted.Eagerly,
-            ReadingMode.fromPreference(readerViewModel.getMangaReadingMode()),
-        )
-
-    /**
-     * Whether the viewers are the WebGPU ones.
-     */
-    val isWebGpu = basePreferences.highQualityRenderer
-
-    val general = settings(
-        preferences.readerTheme,
-        preferences.keepScreenOn,
-        preferences.grayscale,
-        preferences.invertedColors,
-        preferences.fullscreen,
-        preferences.drawUnderCutout,
-        preferences.readWithLongTap,
-        preferences.pageTransitions,
-        preferences.doubleTapAnimSpeed,
-        preferences.readWithVolumeKeys,
-        preferences.readWithVolumeKeysInverted,
-        preferences.alwaysShowChapterTransition,
-        preferences.showNavigationOverlayOnStart,
-    ) {
-        GeneralSettings(
-            theme = ReaderPreferences.ReaderTheme.fromValue(readerTheme.get()),
-            keepScreenOn = keepScreenOn.get(),
-            grayscale = grayscale.get(),
-            invertedColors = invertedColors.get(),
-            fullscreen = fullscreen.get(),
-            drawUnderCutout = drawUnderCutout.get(),
-            longTapEnabled = readWithLongTap.get(),
-            usePageTransitions = pageTransitions.get(),
-            doubleTapAnimDuration = doubleTapAnimSpeed.get(),
-            volumeKeysEnabled = readWithVolumeKeys.get(),
-            volumeKeysInverted = readWithVolumeKeysInverted.get(),
-            alwaysShowChapterTransition = alwaysShowChapterTransition.get(),
-            navigationOverlayOnStart = showNavigationOverlayOnStart.get(),
-        )
-    }
-
-    /**
-     * The custom brightness, 0 when it's off.
-     */
-    @OptIn(ExperimentalCoroutinesApi::class, FlowPreview::class)
-    val brightness: StateFlow<Int> = preferences.customBrightness.changes()
-        .flatMapLatest { enabled ->
-            if (enabled) preferences.customBrightnessValue.changes().sample(0.1.seconds) else flowOf(0)
-        }
-        .stateIn(
-            viewModelScope,
-            SharingStarted.Eagerly,
-            if (preferences.customBrightness.get()) preferences.customBrightnessValue.get() else 0,
-        )
-
-    /**
-     * Settings every paged viewer uses.
-     */
-    val paged = settings(
-        preferences.imageScaleType,
-        preferences.zoomStart,
-        preferences.cropBorders,
-        preferences.landscapeZoom,
-        preferences.navigateToPan,
-        preferences.navigationModePager,
-        preferences.pagerNavInverted,
-    ) {
-        PagedSettings(
-            page = PagedSettings.Page(
-                imageScaleType = ReaderPreferences.ScaleType.fromValue(imageScaleType.get()),
-                zoomStart = ReaderPreferences.ZoomStartType.fromValue(zoomStart.get()),
-                cropBorders = cropBorders.get(),
-                landscapeZoom = landscapeZoom.get(),
-            ),
-            navigateToPan = navigateToPan.get(),
-            navigation = NavigationSettings(
-                ReaderPreferences.NavigationMode.fromValue(navigationModePager.get()),
-                pagerNavInverted.get(),
-            ),
-        )
-    }
-
-    /**
-     * Settings every long strip viewer uses.
-     */
-    val longStrip = settings(
-        preferences.cropBordersWebtoon,
-        preferences.webtoonDisableZoomOut,
-    ) {
-        LongStripSettings(
-            cropBorders = cropBordersWebtoon.get(),
-            zoomOutDisabled = webtoonDisableZoomOut.get(),
-        )
-    }
-
-    /**
-     * Settings only the pager viewers use.
-     */
-    val simplePaged = settings(
-        preferences.dualPageSplitPaged,
-        preferences.dualPageInvertPaged,
-        preferences.dualPageRotateToFit,
-        preferences.dualPageRotateToFitInvert,
-    ) {
-        SimplePagedSettings(
-            dualPageSplit = dualPageSplitPaged.get(),
-            dualPageInvert = dualPageInvertPaged.get(),
-            dualPageRotateToFit = dualPageRotateToFit.get(),
-            dualPageRotateToFitInvert = dualPageRotateToFitInvert.get(),
-        )
-    }
-
-    /**
-     * Settings only the webtoon viewers use.
-     */
-    val simpleLongStrip = settings(
-        preferences.webtoonSidePadding,
-        preferences.dualPageSplitWebtoon,
-        preferences.dualPageInvertWebtoon,
-        preferences.dualPageRotateToFitWebtoon,
-        preferences.dualPageRotateToFitInvertWebtoon,
-        preferences.webtoonDoubleTapZoomEnabled,
-        preferences.navigationModeWebtoon,
-        preferences.webtoonNavInverted,
-    ) {
-        SimpleLongStripSettings(
-            page = SimpleLongStripSettings.Page(
-                sidePadding = webtoonSidePadding.get(),
-                dualPageSplit = dualPageSplitWebtoon.get(),
-                dualPageInvert = dualPageInvertWebtoon.get(),
-                dualPageRotateToFit = dualPageRotateToFitWebtoon.get(),
-                dualPageRotateToFitInvert = dualPageRotateToFitInvertWebtoon.get(),
-            ),
-            doubleTapZoom = webtoonDoubleTapZoomEnabled.get(),
-            navigation = NavigationSettings(
-                ReaderPreferences.NavigationMode.fromValue(navigationModeWebtoon.get()),
-                webtoonNavInverted.get(),
-            ),
-        )
-    }
-
-    /**
-     * Settings only the paged WebGPU viewers use.
-     */
-    val webgpuPaged = settings(
-        preferences.dualPageView,
-        preferences.transitionAnimation,
-        preferences.transitionAnimationDual,
-        preferences.cutoutMode,
-        preferences.cutoutModeDual,
-        preferences.disableDoubleTapGestures,
-        preferences.imageFilters,
-        preferences.tileFilters,
-    ) {
-        WebGpuPagedSettings(
-            page = WebGpuPagedSettings.Page(
-                dualPageView = dualPageView.get(),
-                transitionAnimation = transitionAnimation.get(),
-                transitionAnimationDual = transitionAnimationDual.get(),
-                cutoutMode = cutoutMode.get(),
-                cutoutModeDual = cutoutModeDual.get(),
-            ),
-            common = WebGpuSettings(
-                doubleTapGesturesDisabled = disableDoubleTapGestures.get(),
-                imageFilters = imageFilters.get(),
-                tileFilters = tileFilters.get(),
-            ),
-        )
-    }
-
-    /**
-     * Settings only the long strip WebGPU viewer uses.
-     */
-    val webgpuLongStrip = settings(
-        preferences.continuousMinWidth,
-        preferences.continuousGap,
-        preferences.disableDoubleTapGestures,
-        preferences.imageFilters,
-        preferences.tileFilters,
-    ) {
-        WebGpuLongStripSettings(
-            page = WebGpuLongStripSettings.Page(
-                continuousMinWidth = continuousMinWidth.get(),
-                continuousGap = continuousGap.get(),
-            ),
-            common = WebGpuSettings(
-                doubleTapGesturesDisabled = disableDoubleTapGestures.get(),
-                imageFilters = imageFilters.get(),
-                tileFilters = tileFilters.get(),
-            ),
-        )
-    }
-
-    private val viewerMode = MutableStateFlow<ViewerMode?>(null)
-
-    /**
-     * Tap zones of the open viewer. Null until a viewer is made.
-     */
-    @OptIn(ExperimentalCoroutinesApi::class)
-    val navigation: StateFlow<ViewerNavigation?> = viewerMode
-        .flatMapLatest { viewerMode ->
-            if (viewerMode == null) return@flatMapLatest flowOf(null)
-
-            val usesWebtoonZones = viewerMode.readingMode.type == ReadingMode.ViewerType.Webtoon &&
-                !viewerMode.isWebGpu
-            val settings = if (usesWebtoonZones) {
-                simpleLongStrip.map { it.navigation }
-            } else {
-                paged.map { it.navigation }
-            }
-            val isReversed = viewerMode.readingMode == ReadingMode.RIGHT_TO_LEFT
-            val defaultNavigation: (ReaderPreferences.TappingInvertMode, Boolean) -> ViewerNavigation =
-                if (viewerMode.readingMode.direction == ReadingMode.Direction.Vertical) {
-                    ::LNavigation
-                } else {
-                    ::RightAndLeftNavigation
-                }
-            settings.distinctUntilChanged().map { it.navigator(isReversed, defaultNavigation) }
-        }
-        .stateIn(viewModelScope, SharingStarted.Eagerly, null)
-
-    /**
-     * Called when a viewer is made for [readingMode].
-     */
-    fun setViewerReadingMode(readingMode: ReadingMode) {
-        viewerMode.value = ViewerMode(readingMode, isWebGpu.get())
-    }
-
-    fun setReadingMode(readingMode: ReadingMode) = readerViewModel.setMangaReadingMode(readingMode)
-
-    fun setOrientation(orientation: ReaderOrientation) = readerViewModel.setMangaOrientationType(orientation)
-
-    /**
-     * Whether a viewer must show its tap zones because the reader is new to the user, which it is only once.
-     */
-    fun takeNavigationOverlayForNewUser(): Boolean {
-        val show = preferences.showNavigationOverlayNewUser.get()
-        if (show) {
-            preferences.showNavigationOverlayNewUser.set(false)
-        }
-        return show
-    }
-
-    /**
-     * A value [read] from [sources], kept current as any of them changes. Started eagerly, so a viewer reading it
-     * before collecting gets what the preferences hold now.
-     */
-    private fun <T> settings(vararg sources: Preference<*>, read: ReaderPreferences.() -> T): StateFlow<T> {
-        return sources.map { it.changes() }
-            .merge()
-            .map { preferences.read() }
-            .stateIn(viewModelScope, SharingStarted.Eagerly, preferences.read())
-    }
-
-    private data class ViewerMode(
-        val readingMode: ReadingMode,
-        val isWebGpu: Boolean,
-    )
+    val mangaFlow = readerState
+        .map { it.manga }
+        .distinctUntilChanged()
+        .stateIn(viewModelScope, SharingStarted.Lazily, null)
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/setting/ReadingMode.kt

@@ -7,10 +7,7 @@ import eu.kanade.tachiyomi.ui.reader.viewer.Viewer
 import eu.kanade.tachiyomi.ui.reader.viewer.pager.L2RPagerViewer
 import eu.kanade.tachiyomi.ui.reader.viewer.pager.R2LPagerViewer
 import eu.kanade.tachiyomi.ui.reader.viewer.pager.VerticalPagerViewer
-import eu.kanade.tachiyomi.ui.reader.viewer.webgpu.WebGpuViewer
-import eu.kanade.tachiyomi.ui.reader.viewer.webgpu.WebGpuViewerContinuous
 import eu.kanade.tachiyomi.ui.reader.viewer.webtoon.WebtoonViewer
-import mihon.app.di.appGraph
 import mihon.icons.custommaterialsymbols.CustomMaterialSymbols
 import mihon.icons.custommaterialsymbols.rounded.ReaderLeftToRight
 import mihon.icons.custommaterialsymbols.rounded.ReaderLongStrip
@@ -77,16 +74,6 @@ enum class ReadingMode(
         }
 
         fun toViewer(preference: Int?, activity: ReaderActivity): Viewer {
-            if (activity.appGraph.basePreferences.highQualityRenderer.get()) {
-                return when (fromPreference(preference)) {
-                    LEFT_TO_RIGHT -> WebGpuViewer(activity, isReversed = false, isVertical = false)
-                    RIGHT_TO_LEFT -> WebGpuViewer(activity, isReversed = true, isVertical = false)
-                    VERTICAL -> WebGpuViewer(activity, isReversed = false, isVertical = true)
-                    WEBTOON -> WebGpuViewerContinuous(activity, useGap = false)
-                    CONTINUOUS_VERTICAL -> WebGpuViewerContinuous(activity, useGap = true)
-                    DEFAULT -> throw IllegalStateException("Preference value must be resolved: $preference")
-                }
-            }
             return when (fromPreference(preference)) {
                 LEFT_TO_RIGHT -> L2RPagerViewer(activity)
                 RIGHT_TO_LEFT -> R2LPagerViewer(activity)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/DualPageSettings.kt

@@ -1,11 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-/**
- * How a viewer shows a wide page.
- */
-interface DualPageSettings {
-    val dualPageSplit: Boolean
-    val dualPageInvert: Boolean
-    val dualPageRotateToFit: Boolean
-    val dualPageRotateToFitInvert: Boolean
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/LongStripSettings.kt

@@ -1,9 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-/**
- * Settings every long strip viewer uses.
- */
-data class LongStripSettings(
-    val cropBorders: Boolean,
-    val zoomOutDisabled: Boolean,
-)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/PageImageProcessing.kt

@@ -1,89 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-import eu.kanade.tachiyomi.ui.reader.model.InsertPage
-import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import okio.BufferedSource
-import tachiyomi.core.common.util.system.ImageUtil
-
-/**
- * The image of [page] as a pager shows it: a wide page rotated to fit or split in two, the half on the reading
- * side first, so [isLeftToRight] tells which. [onPageSplit] is told of the [InsertPage] for the second half.
- */
-fun DualPageSettings.processPagedImage(
-    page: ReaderPage,
-    imageSource: BufferedSource,
-    isLeftToRight: Boolean,
-    onPageSplit: (InsertPage) -> Unit,
-): BufferedSource {
-    if (dualPageRotateToFit) {
-        return rotateDualPage(imageSource)
-    }
-
-    if (!dualPageSplit) {
-        return imageSource
-    }
-
-    if (page is InsertPage) {
-        return splitInHalf(imageSource, page, isLeftToRight)
-    }
-
-    val isDoublePage = ImageUtil.isWideImage(imageSource)
-    if (!isDoublePage) {
-        return imageSource
-    }
-
-    onPageSplit(InsertPage(page))
-
-    return splitInHalf(imageSource, page, isLeftToRight)
-}
-
-/**
- * The image of a page as a strip shows it: a wide page rotated to fit, or split with its halves one above the other.
- */
-fun DualPageSettings.processStripImage(imageSource: BufferedSource): BufferedSource {
-    if (dualPageRotateToFit) {
-        return rotateDualPage(imageSource)
-    }
-
-    if (dualPageSplit) {
-        val isDoublePage = ImageUtil.isWideImage(imageSource)
-        if (isDoublePage) {
-            val upperSide = if (dualPageInvert) ImageUtil.Side.LEFT else ImageUtil.Side.RIGHT
-            return ImageUtil.splitAndMerge(imageSource, upperSide)
-        }
-    }
-
-    return imageSource
-}
-
-private fun DualPageSettings.rotateDualPage(imageSource: BufferedSource): BufferedSource {
-    val isDoublePage = ImageUtil.isWideImage(imageSource)
-    return if (isDoublePage) {
-        val rotation = if (dualPageRotateToFitInvert) -90f else 90f
-        ImageUtil.rotateImage(imageSource, rotation)
-    } else {
-        imageSource
-    }
-}
-
-private fun DualPageSettings.splitInHalf(
-    imageSource: BufferedSource,
-    page: ReaderPage,
-    isLeftToRight: Boolean,
-): BufferedSource {
-    var side = when {
-        isLeftToRight && page is InsertPage -> ImageUtil.Side.RIGHT
-        !isLeftToRight && page is InsertPage -> ImageUtil.Side.LEFT
-        isLeftToRight && page !is InsertPage -> ImageUtil.Side.LEFT
-        else -> ImageUtil.Side.RIGHT
-    }
-
-    if (dualPageInvert) {
-        side = when (side) {
-            ImageUtil.Side.RIGHT -> ImageUtil.Side.LEFT
-            ImageUtil.Side.LEFT -> ImageUtil.Side.RIGHT
-        }
-    }
-
-    return ImageUtil.splitInHalf(imageSource, side)
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/PagedSettings.kt

@@ -1,23 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
-
-/**
- * Settings every paged viewer uses.
- */
-data class PagedSettings(
-    val page: Page,
-    val navigateToPan: Boolean,
-    val navigation: NavigationSettings,
-) {
-
-    /**
-     * What the pages are made with, so a change remakes them.
-     */
-    data class Page(
-        val imageScaleType: ReaderPreferences.ScaleType,
-        val zoomStart: ReaderPreferences.ZoomStartType,
-        val cropBorders: Boolean,
-        val landscapeZoom: Boolean,
-    )
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderButton.kt

@@ -0,0 +1,29 @@
+package eu.kanade.tachiyomi.ui.reader.viewer
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.MotionEvent
+import com.google.android.material.R
+import com.google.android.material.button.MaterialButton
+import eu.kanade.tachiyomi.ui.reader.viewer.pager.PagerViewer
+
+/**
+ * A button class to be used by child views of the pager viewer. All tap gestures are handled by
+ * the pager, but this class disables that behavior to allow clickable buttons.
+ */
+class ReaderButton @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = R.attr.materialButtonStyle,
+) : MaterialButton(context, attrs, defStyleAttr) {
+
+    var viewer: PagerViewer? = null
+
+    override fun onTouchEvent(event: MotionEvent): Boolean {
+        viewer?.pager?.setGestureDetectorEnabled(false)
+        if (event.actionMasked == MotionEvent.ACTION_UP || event.actionMasked == MotionEvent.ACTION_CANCEL) {
+            viewer?.pager?.setGestureDetectorEnabled(true)
+        }
+        return super.onTouchEvent(event)
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderPageError.kt

@@ -1,78 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-import android.content.Context
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.AbstractComposeView
-import androidx.compose.ui.platform.LocalContext
-import eu.kanade.presentation.reader.ReaderError
-import eu.kanade.presentation.util.formattedMessage
-import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import eu.kanade.tachiyomi.ui.webview.WebViewActivity
-
-/**
- * [ReaderError] for a [page] that failed with [error]: Retry asks its loader again, and an image from the web can
- * be opened in a WebView with the cookies of the source [sourceId].
- */
-@Composable
-fun ReaderPageError(
-    page: ReaderPage,
-    error: Throwable?,
-    sourceId: Long?,
-    modifier: Modifier = Modifier,
-    onButtonPressChange: ((pressed: Boolean) -> Unit)? = null,
-) {
-    val context = LocalContext.current
-    val imageUrl = page.imageUrl?.takeIf { it.startsWith("http", ignoreCase = true) }
-    ReaderError(
-        message = with(context) { error?.formattedMessage },
-        onRetry = { page.chapter.pageLoader?.retryPage(page) },
-        onOpenInWebView = imageUrl?.let {
-            { context.startActivity(WebViewActivity.newIntent(context, it, sourceId)) }
-        },
-        modifier = modifier,
-        onButtonPressChange = onButtonPressChange,
-    )
-}
-
-/**
- * [ReaderPageError] for the view-based viewers, filling the view, in the theme of its reader-themed [context].
- */
-class ReaderPageErrorView(context: Context) : AbstractComposeView(context) {
-
-    private var data by mutableStateOf<Data?>(null)
-
-    fun bind(
-        page: ReaderPage,
-        error: Throwable?,
-        sourceId: Long?,
-        onButtonPressChange: ((pressed: Boolean) -> Unit)? = null,
-    ) {
-        data = Data(page, error, sourceId, onButtonPressChange)
-    }
-
-    @Composable
-    override fun Content() {
-        val data = data ?: return
-        ReaderThemedContent(context) {
-            ReaderPageError(
-                page = data.page,
-                error = data.error,
-                sourceId = data.sourceId,
-                modifier = Modifier.fillMaxSize(),
-                onButtonPressChange = data.onButtonPressChange,
-            )
-        }
-    }
-
-    private data class Data(
-        val page: ReaderPage,
-        val error: Throwable?,
-        val sourceId: Long?,
-        val onButtonPressChange: ((pressed: Boolean) -> Unit)?,
-    )
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderPageImageView.kt

@@ -1,8 +1,6 @@
 package eu.kanade.tachiyomi.ui.reader.viewer
 
 import android.content.Context
-import android.graphics.ColorFilter
-import android.graphics.Paint
 import android.graphics.PointF
 import android.graphics.RectF
 import android.graphics.drawable.Animatable
@@ -15,7 +13,6 @@ import android.view.View
 import android.view.ViewGroup.LayoutParams.MATCH_PARENT
 import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
 import android.widget.FrameLayout
-import android.widget.ImageView
 import androidx.annotation.AttrRes
 import androidx.annotation.CallSuper
 import androidx.annotation.StyleRes
@@ -44,6 +41,7 @@ import eu.kanade.tachiyomi.ui.reader.viewer.webtoon.WebtoonStripImageView
 import eu.kanade.tachiyomi.util.system.animatorDurationScale
 import eu.kanade.tachiyomi.util.view.isVisibleOnScreen
 import okio.BufferedSource
+import tachiyomi.core.common.util.system.ImageUtil
 
 /**
  * A wrapper view for showing page image.
@@ -63,30 +61,6 @@ open class ReaderPageImageView @JvmOverloads constructor(
 
     private var pageView: View? = null
 
-    /**
-     * The reader's grayscale and inverted colours for the page image alone, so the transition and error views
-     * keep theirs - see [LocalPageColorFilter].
-     */
-    var pageColorFilter: ColorFilter? = null
-        set(value) {
-            if (field == value) return
-            field = value
-            applyPageColorFilter()
-        }
-
-    private fun applyPageColorFilter() {
-        val filter = pageColorFilter
-        when (val view = pageView) {
-            is ImageView -> view.colorFilter = filter
-            is WebtoonStripImageView -> view.colorFilter = filter
-            // Drawn with its own paints: a layer takes the filter instead, as wide as the screen it fills.
-            is SubsamplingScaleImageView -> view.setLayerType(
-                if (filter == null) LAYER_TYPE_NONE else LAYER_TYPE_HARDWARE,
-                filter?.let { Paint().apply { colorFilter = it } },
-            )
-        }
-    }
-
     private var stripRequest: Disposable? = null
 
     private var config: Config? = null
@@ -267,6 +241,7 @@ open class ReaderPageImageView @JvmOverloads constructor(
         removeView(pageView)
 
         pageView = SubsamplingScaleImageView(context).apply {
+            setMaxTileSize(ImageUtil.hardwareBitmapThreshold)
             setDoubleTapZoomStyle(SubsamplingScaleImageView.ZOOM_FOCUS_CENTER)
             setPanLimit(SubsamplingScaleImageView.PAN_LIMIT_INSIDE)
             setMinimumTileDpi(180)
@@ -284,7 +259,6 @@ open class ReaderPageImageView @JvmOverloads constructor(
             setOnClickListener { this@ReaderPageImageView.onViewClicked() }
         }
         addView(pageView, MATCH_PARENT, MATCH_PARENT)
-        applyPageColorFilter()
     }
 
     private fun SubsamplingScaleImageView.setupZoom(config: Config?) {
@@ -328,6 +302,7 @@ open class ReaderPageImageView @JvmOverloads constructor(
                 isVisible = true
             }
             is BufferedSource -> {
+                setHardwareConfig(ImageUtil.canUseHardwareBitmap(data))
                 setImage(ImageSource.inputStream(data.inputStream()))
                 isVisible = true
             }
@@ -343,7 +318,6 @@ open class ReaderPageImageView @JvmOverloads constructor(
 
         pageView = WebtoonStripImageView(context)
         addView(pageView, MATCH_PARENT, WRAP_CONTENT)
-        applyPageColorFilter()
     }
 
     private fun setStripImage(data: BufferedSource, config: Config) {
@@ -420,7 +394,6 @@ open class ReaderPageImageView @JvmOverloads constructor(
             }
         }
         addView(pageView, MATCH_PARENT, MATCH_PARENT)
-        applyPageColorFilter()
     }
 
     private fun setAnimatedImage(

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderThemedContent.kt

@@ -1,25 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-import android.content.Context
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.CompositionLocalProvider
-import androidx.compose.ui.platform.LocalConfiguration
-import androidx.compose.ui.platform.LocalContext
-import eu.kanade.presentation.theme.TachiyomiTheme
-
-/**
- * [content] in the app's theme under the reader's own night mode, from [readerThemedContext].
- *
- * Pages sit on the reader background, so a light app over a black reader would otherwise draw dark text on black.
- * [TachiyomiTheme] reads that from the configuration, which the view-based viewers got by inflating their views
- * from a reader-themed context.
- */
-@Composable
-fun ReaderThemedContent(readerThemedContext: Context, content: @Composable () -> Unit) {
-    CompositionLocalProvider(
-        LocalContext provides readerThemedContext,
-        LocalConfiguration provides readerThemedContext.resources.configuration,
-    ) {
-        TachiyomiTheme(content = content)
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderTransitionPage.kt

@@ -1,86 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.PaddingValues
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Button
-import androidx.compose.material3.CircularProgressIndicator
-import androidx.compose.material3.LocalContentColor
-import androidx.compose.material3.LocalTextStyle
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.CompositionLocalProvider
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import eu.kanade.presentation.reader.ChapterTransition
-import eu.kanade.presentation.reader.reportPress
-import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
-import tachiyomi.i18n.MR
-import tachiyomi.presentation.core.i18n.stringResource
-
-@Composable
-fun ReaderTransitionPage(
-    transition: ChapterTransition,
-    downloadState: TransitionDownloadState?,
-    onRetry: (ReaderChapter) -> Unit,
-    onButtonPressChange: (pressed: Boolean) -> Unit,
-    modifier: Modifier = Modifier,
-    statusPadding: PaddingValues = PaddingValues(),
-) {
-    Column(
-        modifier = modifier,
-        verticalArrangement = Arrangement.Center,
-        horizontalAlignment = Alignment.CenterHorizontally,
-    ) {
-        if (downloadState != null) {
-            CompositionLocalProvider(
-                LocalTextStyle provides MaterialTheme.typography.bodySmall,
-                LocalContentColor provides MaterialTheme.colorScheme.onBackground,
-            ) {
-                ChapterTransition(
-                    transition,
-                    downloadState.currChapterDownloaded,
-                    downloadState.goingToChapterDownloaded,
-                )
-            }
-        }
-
-        val toChapter = transition.to ?: return@Column
-        val state by toChapter.stateFlow.collectAsState()
-        when (val state = state) {
-            is ReaderChapter.State.Loading -> Column(
-                modifier = Modifier.padding(statusPadding),
-                horizontalAlignment = Alignment.CenterHorizontally,
-            ) {
-                CircularProgressIndicator()
-                Text(
-                    text = stringResource(MR.strings.transition_pages_loading),
-                    color = MaterialTheme.colorScheme.onBackground,
-                    style = MaterialTheme.typography.bodyMedium,
-                )
-            }
-            is ReaderChapter.State.Error -> Column(
-                modifier = Modifier.padding(statusPadding),
-                horizontalAlignment = Alignment.CenterHorizontally,
-            ) {
-                Text(
-                    text = stringResource(MR.strings.transition_pages_error, state.error.message ?: ""),
-                    color = MaterialTheme.colorScheme.onBackground,
-                    style = MaterialTheme.typography.bodyMedium,
-                )
-                Button(
-                    onClick = { onRetry(toChapter) },
-                    modifier = Modifier.reportPress(onButtonPressChange),
-                ) {
-                    Text(stringResource(MR.strings.action_retry))
-                }
-            }
-            is ReaderChapter.State.Wait, is ReaderChapter.State.Loaded -> {}
-        }
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderTransitionView.kt

@@ -2,58 +2,91 @@ package eu.kanade.tachiyomi.ui.reader.viewer
 
 import android.content.Context
 import android.util.AttributeSet
-import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.material3.LocalContentColor
+import androidx.compose.material3.LocalTextStyle
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.produceState
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.platform.AbstractComposeView
+import eu.kanade.presentation.reader.ChapterTransition
+import eu.kanade.presentation.theme.TachiyomiTheme
+import eu.kanade.tachiyomi.data.download.DownloadManager
+import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
+import tachiyomi.domain.manga.model.Manga
+import tachiyomi.source.local.isLocal
 
-/**
- * [ReaderTransitionPage] for the view-based viewers, in the theme of its reader-themed [context].
- */
 class ReaderTransitionView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) :
     AbstractComposeView(context, attrs) {
 
     private var data: Data? by mutableStateOf(null)
 
     init {
-        layoutParams = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)
+        layoutParams = LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)
     }
 
-    fun bind(
-        transition: ChapterTransition,
-        downloadState: TransitionDownloadState?,
-        onRetry: (ReaderChapter) -> Unit,
-        onButtonPressChange: (pressed: Boolean) -> Unit = {},
-        statusPadding: PaddingValues = PaddingValues(),
-    ) {
-        data = Data(transition, downloadState, onRetry, onButtonPressChange, statusPadding)
+    fun bind(transition: ChapterTransition, downloadManager: DownloadManager, manga: Manga?, source: Source?) {
+        data = if (manga != null && source != null) {
+            val goingToChapter = transition.to?.chapter.takeUnless { manga.isLocal() }
+            Data(
+                transition = transition,
+                currChapterDownloaded = transition.from.pageLoader?.isLocal == true,
+                goingToChapterDownloaded = manga.isLocal() ||
+                    goingToChapter?.let {
+                        downloadManager.isChapterDownloaded(
+                            chapterName = it.name,
+                            chapterScanlator = it.scanlator,
+                            chapterUrl = it.url,
+                            mangaTitle = manga.title,
+                            sourceId = manga.source,
+                        )
+                    } ?: false,
+                isGoingToChapterOnDisk = goingToChapter?.let {
+                    {
+                        downloadManager.isChapterDownloadedOnDisk(
+                            chapterName = it.name,
+                            chapterScanlator = it.scanlator,
+                            chapterUrl = it.url,
+                            mangaTitle = manga.title,
+                            source = source,
+                        )
+                    }
+                },
+            )
+        } else {
+            null
+        }
     }
 
     @Composable
     override fun Content() {
-        val data = data ?: return
-        LaunchedEffect(data.downloadState) { data.downloadState?.checkDisk() }
-        ReaderThemedContent(context) {
-            ReaderTransitionPage(
-                transition = data.transition,
-                downloadState = data.downloadState,
-                onRetry = data.onRetry,
-                onButtonPressChange = data.onButtonPressChange,
-                statusPadding = data.statusPadding,
-            )
+        data?.let {
+            val goingToChapterDownloaded by produceState(it.goingToChapterDownloaded, it) {
+                it.isGoingToChapterOnDisk?.let { isOnDisk -> value = isOnDisk() }
+            }
+            TachiyomiTheme {
+                CompositionLocalProvider(
+                    LocalTextStyle provides MaterialTheme.typography.bodySmall,
+                    LocalContentColor provides MaterialTheme.colorScheme.onBackground,
+                ) {
+                    ChapterTransition(
+                        transition = it.transition,
+                        currChapterDownloaded = it.currChapterDownloaded,
+                        goingToChapterDownloaded = goingToChapterDownloaded,
+                    )
+                }
+            }
         }
     }
 
     private data class Data(
         val transition: ChapterTransition,
-        val downloadState: TransitionDownloadState?,
-        val onRetry: (ReaderChapter) -> Unit,
-        val onButtonPressChange: (pressed: Boolean) -> Unit,
-        val statusPadding: PaddingValues,
+        val currChapterDownloaded: Boolean,
+        val goingToChapterDownloaded: Boolean,
+        val isGoingToChapterOnDisk: (suspend () -> Boolean)?,
     )
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/TransitionDownloadState.kt

@@ -1,56 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.setValue
-import eu.kanade.tachiyomi.data.download.DownloadManager
-import eu.kanade.tachiyomi.source.Source
-import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import tachiyomi.domain.manga.model.Manga
-import tachiyomi.source.local.isLocal
-
-class TransitionDownloadState(
-    val currChapterDownloaded: Boolean,
-    goingToChapterDownloaded: Boolean,
-    private val isGoingToChapterOnDisk: (suspend () -> Boolean)?,
-) {
-    var goingToChapterDownloaded by mutableStateOf(goingToChapterDownloaded)
-        private set
-
-    suspend fun checkDisk() {
-        isGoingToChapterOnDisk?.let { goingToChapterDownloaded = it() }
-    }
-}
-
-fun DownloadManager.transitionDownloadState(
-    transition: ChapterTransition,
-    manga: Manga?,
-    source: Source?,
-): TransitionDownloadState? {
-    if (manga == null || source == null) return null
-    val goingToChapter = transition.to?.chapter.takeUnless { manga.isLocal() }
-    return TransitionDownloadState(
-        currChapterDownloaded = transition.from.pageLoader?.isLocal == true,
-        goingToChapterDownloaded = manga.isLocal() ||
-            goingToChapter?.let {
-                isChapterDownloaded(
-                    chapterName = it.name,
-                    chapterScanlator = it.scanlator,
-                    chapterUrl = it.url,
-                    mangaTitle = manga.title,
-                    sourceId = manga.source,
-                )
-            } ?: false,
-        isGoingToChapterOnDisk = goingToChapter?.let {
-            {
-                isChapterDownloadedOnDisk(
-                    chapterName = it.name,
-                    chapterScanlator = it.scanlator,
-                    chapterUrl = it.url,
-                    mangaTitle = manga.title,
-                    source = source,
-                )
-            }
-        },
-    )
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/Viewer.kt

@@ -1,12 +1,8 @@
 package eu.kanade.tachiyomi.ui.reader.viewer
 
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.compositionLocalOf
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.ColorFilter
-import androidx.compose.ui.input.pointer.PointerEventPass
-import androidx.compose.ui.input.pointer.PointerEventType
-import androidx.compose.ui.input.pointer.pointerInput
+import android.view.KeyEvent
+import android.view.MotionEvent
+import android.view.View
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
 
@@ -16,10 +12,9 @@ import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
 interface Viewer {
 
     /**
-     * Draws this viewer.
+     * Returns the view this viewer uses.
      */
-    @Composable
-    fun Content(modifier: Modifier)
+    fun getView(): View
 
     /**
      * Destroys this viewer. Called when leaving the reader or swapping viewers.
@@ -37,37 +32,14 @@ interface Viewer {
     fun moveToPage(page: ReaderPage)
 
     /**
-     * Moves forward through the pages.
+     * Called from the containing activity when a key [event] is received. It should return true
+     * if the event was handled, false otherwise.
      */
-    fun moveForward()
+    fun handleKeyEvent(event: KeyEvent): Boolean
 
     /**
-     * Moves backward through the pages.
+     * Called from the containing activity when a generic motion [event] is received. It should
+     * return true if the event was handled, false otherwise.
      */
-    fun moveBackward()
-}
-
-/**
- * The reader's grayscale and inverted colours, for page images only: transition, loading and error pages keep
- * theirs. Null when both are off.
- */
-val LocalPageColorFilter = compositionLocalOf<ColorFilter?> { null }
-
-/**
- * Turns pages with the mouse wheel instead of letting the content scroll.
- */
-fun Modifier.mouseWheelPaging(viewer: Viewer): Modifier = pointerInput(viewer) {
-    awaitPointerEventScope {
-        while (true) {
-            val event = awaitPointerEvent(PointerEventPass.Initial)
-            if (event.type != PointerEventType.Scroll) continue
-            val delta = event.changes.first().scrollDelta.y
-            when {
-                delta > 0 -> viewer.moveForward()
-                delta < 0 -> viewer.moveBackward()
-                else -> continue
-            }
-            event.changes.forEach { it.consume() }
-        }
-    }
+    fun handleGenericMotionEvent(event: MotionEvent): Boolean
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ViewerConfig.kt

@@ -0,0 +1,90 @@
+package eu.kanade.tachiyomi.ui.reader.viewer
+
+import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import tachiyomi.core.common.preference.Preference
+
+/**
+ * Common configuration for all viewers.
+ */
+abstract class ViewerConfig(readerPreferences: ReaderPreferences, private val scope: CoroutineScope) {
+
+    var imagePropertyChangedListener: (() -> Unit)? = null
+
+    var navigationModeChangedListener: (() -> Unit)? = null
+
+    var tappingInverted = ReaderPreferences.TappingInvertMode.NONE
+    var longTapEnabled = true
+    var usePageTransitions = false
+    var doubleTapAnimDuration = 500
+    var volumeKeysEnabled = false
+    var volumeKeysInverted = false
+    var alwaysShowChapterTransition = true
+    var navigationMode = 0
+        protected set
+
+    var forceNavigationOverlay = false
+
+    var navigationOverlayOnStart = false
+
+    var dualPageSplit = false
+        protected set
+
+    var dualPageInvert = false
+        protected set
+
+    var dualPageRotateToFit = false
+        protected set
+
+    var dualPageRotateToFitInvert = false
+        protected set
+
+    abstract var navigator: ViewerNavigation
+        protected set
+
+    init {
+        readerPreferences.readWithLongTap
+            .register({ longTapEnabled = it })
+
+        readerPreferences.pageTransitions
+            .register({ usePageTransitions = it })
+
+        readerPreferences.doubleTapAnimSpeed
+            .register({ doubleTapAnimDuration = it })
+
+        readerPreferences.readWithVolumeKeys
+            .register({ volumeKeysEnabled = it })
+
+        readerPreferences.readWithVolumeKeysInverted
+            .register({ volumeKeysInverted = it })
+
+        readerPreferences.alwaysShowChapterTransition
+            .register({ alwaysShowChapterTransition = it })
+
+        forceNavigationOverlay = readerPreferences.showNavigationOverlayNewUser.get()
+        if (forceNavigationOverlay) {
+            readerPreferences.showNavigationOverlayNewUser.set(false)
+        }
+
+        readerPreferences.showNavigationOverlayOnStart
+            .register({ navigationOverlayOnStart = it })
+    }
+
+    protected abstract fun defaultNavigation(): ViewerNavigation
+
+    abstract fun updateNavigation(navigationMode: Int)
+
+    fun <T> Preference<T>.register(
+        valueAssignment: (T) -> Unit,
+        onChanged: (T) -> Unit = {},
+    ) {
+        changes()
+            .onEach { valueAssignment(it) }
+            .distinctUntilChanged()
+            .onEach { onChanged(it) }
+            .launchIn(scope)
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ViewerItems.kt

@@ -1,43 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
-import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
-
-/**
- * The items of a viewer for [chapters], top to bottom: the previous chapter's pages, its transition, [currentPages],
- * then the next transition and chapter's pages, so moving between chapters is seamless. A transition is left out
- * when its chapter is loaded and adjacent, unless [forceTransition].
- */
-fun viewerItems(
-    chapters: ViewerChapters,
-    forceTransition: Boolean,
-    currentPages: List<ReaderPage>? = chapters.currChapter.pages,
-): MutableList<Any> {
-    val items = mutableListOf<Any>()
-
-    // Forces chapter transition if there is missing chapters
-    val prevHasMissingChapters = calculateChapterGap(chapters.currChapter, chapters.prevChapter) > 0
-    val nextHasMissingChapters = calculateChapterGap(chapters.nextChapter, chapters.currChapter) > 0
-
-    // Add previous chapter pages and transition
-    chapters.prevChapter?.pages?.let(items::addAll)
-
-    // Skip transition page if the chapter is loaded & current page is not a transition page
-    if (prevHasMissingChapters || forceTransition || chapters.prevChapter?.state !is ReaderChapter.State.Loaded) {
-        items.add(ChapterTransition.Prev(chapters.currChapter, chapters.prevChapter))
-    }
-
-    // Add current chapter.
-    currentPages?.let(items::addAll)
-
-    // Add next chapter transition and pages.
-    if (nextHasMissingChapters || forceTransition || chapters.nextChapter?.state !is ReaderChapter.State.Loaded) {
-        items.add(ChapterTransition.Next(chapters.currChapter, chapters.nextChapter))
-    }
-
-    chapters.nextChapter?.pages?.let(items::addAll)
-
-    return items
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ViewerNavigation.kt

@@ -1,75 +1,54 @@
 package eu.kanade.tachiyomi.ui.reader.viewer
 
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.geometry.Rect
-import androidx.compose.ui.graphics.Color
+import android.graphics.Color
+import android.graphics.PointF
+import android.graphics.RectF
 import dev.icerock.moko.resources.StringResource
 import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
+import eu.kanade.tachiyomi.util.lang.invert
 import tachiyomi.i18n.MR
 
-/**
- * Tap zones of a viewer. [isReversed] is set for right to left books, where the right side of the
- * screen goes back.
- */
-abstract class ViewerNavigation(
-    val invertMode: ReaderPreferences.TappingInvertMode,
-    val isReversed: Boolean,
-) {
+abstract class ViewerNavigation {
 
-    enum class Action { MENU, FORWARD, BACKWARD }
-
-    sealed class NavigationRegion(val nameRes: StringResource, val color: Color) {
-        data object MENU : NavigationRegion(MR.strings.action_menu, Color(0xCC95818D))
-        data object PREV : NavigationRegion(MR.strings.nav_zone_prev, Color(0xCCFF7733))
-        data object NEXT : NavigationRegion(MR.strings.nav_zone_next, Color(0xCC84E296))
-        data object LEFT : NavigationRegion(MR.strings.nav_zone_left, Color(0xCC7D1128))
-        data object RIGHT : NavigationRegion(MR.strings.nav_zone_right, Color(0xCCA6CFD5))
+    sealed class NavigationRegion(val nameRes: StringResource, val color: Int) {
+        data object MENU : NavigationRegion(MR.strings.action_menu, Color.argb(0xCC, 0x95, 0x81, 0x8D))
+        data object PREV : NavigationRegion(MR.strings.nav_zone_prev, Color.argb(0xCC, 0xFF, 0x77, 0x33))
+        data object NEXT : NavigationRegion(MR.strings.nav_zone_next, Color.argb(0xCC, 0x84, 0xE2, 0x96))
+        data object LEFT : NavigationRegion(MR.strings.nav_zone_left, Color.argb(0xCC, 0x7D, 0x11, 0x28))
+        data object RIGHT : NavigationRegion(MR.strings.nav_zone_right, Color.argb(0xCC, 0xA6, 0xCF, 0xD5))
     }
 
     data class Region(
-        val rect: Rect,
+        val rectF: RectF,
         val type: NavigationRegion,
     ) {
         fun invert(invertMode: ReaderPreferences.TappingInvertMode): Region {
-            val horizontal = invertMode.shouldInvertHorizontal
-            val vertical = invertMode.shouldInvertVertical
-            if (!horizontal && !vertical) return this
-            return copy(
-                rect = Rect(
-                    left = if (horizontal) 1f - rect.right else rect.left,
-                    top = if (vertical) 1f - rect.bottom else rect.top,
-                    right = if (horizontal) 1f - rect.left else rect.right,
-                    bottom = if (vertical) 1f - rect.top else rect.bottom,
-                ),
+            if (invertMode == ReaderPreferences.TappingInvertMode.NONE) return this
+            return this.copy(
+                rectF = this.rectF.invert(invertMode),
             )
         }
     }
 
-    protected abstract val regionList: List<Region>
+    private var constantMenuRegion: RectF = RectF(0f, 0f, 1f, 0.05f)
+
+    var invertMode: ReaderPreferences.TappingInvertMode = ReaderPreferences.TappingInvertMode.NONE
+
+    protected abstract var regionList: List<Region>
 
     /** Returns regions with applied inversion. */
     fun getRegions(): List<Region> {
         return regionList.map { it.invert(invertMode) }
     }
 
-    fun getAction(pos: Offset): Action {
-        val region = getRegions().find { pos in it.rect } ?: return Action.MENU
-        return actionOf(region.type)
+    fun getAction(pos: PointF): NavigationRegion {
+        val x = pos.x
+        val y = pos.y
+        val region = getRegions().find { it.rectF.contains(x, y) }
+        return when {
+            region != null -> region.type
+            constantMenuRegion.contains(x, y) -> NavigationRegion.MENU
+            else -> NavigationRegion.MENU
+        }
     }
-
-    fun actionOf(region: NavigationRegion): Action = when (region) {
-        NavigationRegion.MENU -> Action.MENU
-        NavigationRegion.NEXT -> Action.FORWARD
-        NavigationRegion.PREV -> Action.BACKWARD
-        NavigationRegion.RIGHT -> if (isReversed) Action.BACKWARD else Action.FORWARD
-        NavigationRegion.LEFT -> if (isReversed) Action.FORWARD else Action.BACKWARD
-    }
-
-    override fun equals(other: Any?): Boolean =
-        other is ViewerNavigation &&
-            other.javaClass == javaClass &&
-            other.invertMode == invertMode &&
-            other.isReversed == isReversed
-
-    override fun hashCode(): Int = (31 * javaClass.hashCode() + invertMode.hashCode()) * 31 + isReversed.hashCode()
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ViewerSettings.kt

@@ -1,61 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer
-
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
-import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView.ZoomStartPosition
-import eu.kanade.tachiyomi.ui.reader.viewer.navigation.DisabledNavigation
-import eu.kanade.tachiyomi.ui.reader.viewer.navigation.EdgeNavigation
-import eu.kanade.tachiyomi.ui.reader.viewer.navigation.KindlishNavigation
-import eu.kanade.tachiyomi.ui.reader.viewer.navigation.LNavigation
-import eu.kanade.tachiyomi.ui.reader.viewer.navigation.RightAndLeftNavigation
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.launch
-
-/**
- * A viewer's tap zones, as the preferences store them.
- */
-data class NavigationSettings(
-    val mode: ReaderPreferences.NavigationMode,
-    val inverted: ReaderPreferences.TappingInvertMode,
-) {
-
-    fun navigator(
-        isReversed: Boolean,
-        default: (ReaderPreferences.TappingInvertMode, Boolean) -> ViewerNavigation,
-    ): ViewerNavigation {
-        return when (mode) {
-            ReaderPreferences.NavigationMode.DEFAULT -> default(inverted, isReversed)
-            ReaderPreferences.NavigationMode.L_SHAPED -> LNavigation(inverted, isReversed)
-            ReaderPreferences.NavigationMode.KINDLISH -> KindlishNavigation(inverted, isReversed)
-            ReaderPreferences.NavigationMode.EDGE -> EdgeNavigation(inverted, isReversed)
-            ReaderPreferences.NavigationMode.RIGHT_AND_LEFT -> RightAndLeftNavigation(inverted, isReversed)
-            ReaderPreferences.NavigationMode.DISABLED -> DisabledNavigation(inverted, isReversed)
-        }
-    }
-}
-
-/**
- * Where a page starts zoomed for this setting, where [auto] is what automatic means for the viewer.
- */
-fun ReaderPreferences.ZoomStartType.position(auto: ZoomStartPosition): ZoomStartPosition {
-    return when (this) {
-        ReaderPreferences.ZoomStartType.AUTOMATIC -> auto
-        ReaderPreferences.ZoomStartType.LEFT -> ZoomStartPosition.LEFT
-        ReaderPreferences.ZoomStartType.RIGHT -> ZoomStartPosition.RIGHT
-        ReaderPreferences.ZoomStartType.CENTER -> ZoomStartPosition.CENTER
-    }
-}
-
-/**
- * Runs [action] in [scope] with each value and the one before it, null for the first, so a viewer applies a change
- * in one place by comparing the parts it reacts to.
- */
-fun <T : Any> Flow<T>.collectChanges(scope: CoroutineScope, action: (old: T?, new: T) -> Unit) {
-    scope.launch {
-        var old: T? = null
-        collect {
-            action(old, it)
-            old = it
-        }
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/navigation/DisabledNavigation.kt

@@ -1,6 +1,5 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.navigation
 
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences.TappingInvertMode
 import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
 
 /**
@@ -13,10 +12,7 @@ import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
  * | M | M | M |   N: Next
  * +---+---+---+
 */
-class DisabledNavigation(
-    invertMode: TappingInvertMode,
-    isReversed: Boolean,
-) : ViewerNavigation(invertMode, isReversed) {
+class DisabledNavigation : ViewerNavigation() {
 
-    override val regionList: List<Region> = emptyList()
+    override var regionList: List<Region> = emptyList()
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/navigation/EdgeNavigation.kt

@@ -1,7 +1,6 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.navigation
 
-import androidx.compose.ui.geometry.Rect
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences.TappingInvertMode
+import android.graphics.RectF
 import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
 
 /**
@@ -14,19 +13,19 @@ import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
  * | N | P | N |   N: Next
  * +---+---+---+
 */
-class EdgeNavigation(invertMode: TappingInvertMode, isReversed: Boolean) : ViewerNavigation(invertMode, isReversed) {
+class EdgeNavigation : ViewerNavigation() {
 
-    override val regionList: List<Region> = listOf(
+    override var regionList: List<Region> = listOf(
         Region(
-            rect = Rect(0f, 0f, 0.33f, 1f),
+            rectF = RectF(0f, 0f, 0.33f, 1f),
             type = NavigationRegion.NEXT,
         ),
         Region(
-            rect = Rect(0.33f, 0.66f, 0.66f, 1f),
+            rectF = RectF(0.33f, 0.66f, 0.66f, 1f),
             type = NavigationRegion.PREV,
         ),
         Region(
-            rect = Rect(0.66f, 0f, 1f, 1f),
+            rectF = RectF(0.66f, 0f, 1f, 1f),
             type = NavigationRegion.NEXT,
         ),
     )

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/navigation/KindlishNavigation.kt

@@ -1,7 +1,6 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.navigation
 
-import androidx.compose.ui.geometry.Rect
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences.TappingInvertMode
+import android.graphics.RectF
 import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
 
 /**
@@ -14,18 +13,15 @@ import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
  * | P | N | N |   N: Next
  * +---+---+---+
 */
-class KindlishNavigation(
-    invertMode: TappingInvertMode,
-    isReversed: Boolean,
-) : ViewerNavigation(invertMode, isReversed) {
+class KindlishNavigation : ViewerNavigation() {
 
-    override val regionList: List<Region> = listOf(
+    override var regionList: List<Region> = listOf(
         Region(
-            rect = Rect(0.33f, 0.33f, 1f, 1f),
+            rectF = RectF(0.33f, 0.33f, 1f, 1f),
             type = NavigationRegion.NEXT,
         ),
         Region(
-            rect = Rect(0f, 0.33f, 0.33f, 1f),
+            rectF = RectF(0f, 0.33f, 0.33f, 1f),
             type = NavigationRegion.PREV,
         ),
     )

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/navigation/LNavigation.kt

@@ -1,7 +1,6 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.navigation
 
-import androidx.compose.ui.geometry.Rect
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences.TappingInvertMode
+import android.graphics.RectF
 import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
 
 /**
@@ -14,23 +13,23 @@ import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
  * | N | N | N |   N: Next
  * +---+---+---+
  */
-open class LNavigation(invertMode: TappingInvertMode, isReversed: Boolean) : ViewerNavigation(invertMode, isReversed) {
+open class LNavigation : ViewerNavigation() {
 
-    override val regionList: List<Region> = listOf(
+    override var regionList: List<Region> = listOf(
         Region(
-            rect = Rect(0f, 0.33f, 0.33f, 0.66f),
+            rectF = RectF(0f, 0.33f, 0.33f, 0.66f),
             type = NavigationRegion.PREV,
         ),
         Region(
-            rect = Rect(0f, 0f, 1f, 0.33f),
+            rectF = RectF(0f, 0f, 1f, 0.33f),
             type = NavigationRegion.PREV,
         ),
         Region(
-            rect = Rect(0.66f, 0.33f, 1f, 0.66f),
+            rectF = RectF(0.66f, 0.33f, 1f, 0.66f),
             type = NavigationRegion.NEXT,
         ),
         Region(
-            rect = Rect(0f, 0.66f, 1f, 1f),
+            rectF = RectF(0f, 0.66f, 1f, 1f),
             type = NavigationRegion.NEXT,
         ),
     )

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/navigation/RightAndLeftNavigation.kt

@@ -1,7 +1,6 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.navigation
 
-import androidx.compose.ui.geometry.Rect
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences.TappingInvertMode
+import android.graphics.RectF
 import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
 
 /**
@@ -14,18 +13,15 @@ import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
  * | N | M | P |   N: Move Left
  * +---+---+---+
  */
-class RightAndLeftNavigation(
-    invertMode: TappingInvertMode,
-    isReversed: Boolean,
-) : ViewerNavigation(invertMode, isReversed) {
+class RightAndLeftNavigation : ViewerNavigation() {
 
-    override val regionList: List<Region> = listOf(
+    override var regionList: List<Region> = listOf(
         Region(
-            rect = Rect(0f, 0f, 0.33f, 1f),
+            rectF = RectF(0f, 0f, 0.33f, 1f),
             type = NavigationRegion.LEFT,
         ),
         Region(
-            rect = Rect(0.66f, 0f, 1f, 1f),
+            rectF = RectF(0.66f, 0f, 1f, 1f),
             type = NavigationRegion.RIGHT,
         ),
     )

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerConfig.kt

@@ -0,0 +1,150 @@
+package eu.kanade.tachiyomi.ui.reader.viewer.pager
+
+import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
+import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerConfig
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.DisabledNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.EdgeNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.KindlishNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.LNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.RightAndLeftNavigation
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.drop
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+
+/**
+ * Configuration used by pager viewers.
+ */
+class PagerConfig(
+    private val viewer: PagerViewer,
+    scope: CoroutineScope,
+    readerPreferences: ReaderPreferences,
+) : ViewerConfig(readerPreferences, scope) {
+
+    var theme = readerPreferences.readerTheme.get()
+        private set
+
+    var automaticBackground = false
+        private set
+
+    var dualPageSplitChangedListener: ((Boolean) -> Unit)? = null
+
+    var imageScaleType = 1
+        private set
+
+    var imageZoomType = ReaderPageImageView.ZoomStartPosition.LEFT
+        private set
+
+    var imageCropBorders = false
+        private set
+
+    var navigateToPan = false
+        private set
+
+    var landscapeZoom = false
+        private set
+
+    init {
+        readerPreferences.readerTheme
+            .register(
+                {
+                    theme = it
+                    automaticBackground = it == 3
+                },
+                { imagePropertyChangedListener?.invoke() },
+            )
+
+        readerPreferences.imageScaleType
+            .register({ imageScaleType = it }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.zoomStart
+            .register({ zoomTypeFromPreference(it) }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.cropBorders
+            .register({ imageCropBorders = it }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.navigateToPan
+            .register({ navigateToPan = it })
+
+        readerPreferences.landscapeZoom
+            .register({ landscapeZoom = it }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.navigationModePager
+            .register({ navigationMode = it }, { updateNavigation(navigationMode) })
+
+        readerPreferences.pagerNavInverted
+            .register({ tappingInverted = it }, { navigator.invertMode = it })
+        readerPreferences.pagerNavInverted.changes()
+            .drop(1)
+            .onEach { navigationModeChangedListener?.invoke() }
+            .launchIn(scope)
+
+        readerPreferences.dualPageSplitPaged
+            .register(
+                { dualPageSplit = it },
+                {
+                    imagePropertyChangedListener?.invoke()
+                    dualPageSplitChangedListener?.invoke(it)
+                },
+            )
+
+        readerPreferences.dualPageInvertPaged
+            .register({ dualPageInvert = it }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.dualPageRotateToFit
+            .register(
+                { dualPageRotateToFit = it },
+                { imagePropertyChangedListener?.invoke() },
+            )
+
+        readerPreferences.dualPageRotateToFitInvert
+            .register(
+                { dualPageRotateToFitInvert = it },
+                { imagePropertyChangedListener?.invoke() },
+            )
+    }
+
+    private fun zoomTypeFromPreference(value: Int) {
+        imageZoomType = when (value) {
+            // Auto
+            1 -> when (viewer) {
+                is L2RPagerViewer -> ReaderPageImageView.ZoomStartPosition.LEFT
+                is R2LPagerViewer -> ReaderPageImageView.ZoomStartPosition.RIGHT
+                else -> ReaderPageImageView.ZoomStartPosition.CENTER
+            }
+            // Left
+            2 -> ReaderPageImageView.ZoomStartPosition.LEFT
+            // Right
+            3 -> ReaderPageImageView.ZoomStartPosition.RIGHT
+            // Center
+            else -> ReaderPageImageView.ZoomStartPosition.CENTER
+        }
+    }
+
+    override var navigator: ViewerNavigation = defaultNavigation()
+        set(value) {
+            field = value.also { it.invertMode = this.tappingInverted }
+        }
+
+    override fun defaultNavigation(): ViewerNavigation {
+        return when (viewer) {
+            is VerticalPagerViewer -> LNavigation()
+            else -> RightAndLeftNavigation()
+        }
+    }
+
+    override fun updateNavigation(navigationMode: Int) {
+        navigator = when (navigationMode) {
+            0 -> defaultNavigation()
+            1 -> LNavigation()
+            2 -> KindlishNavigation()
+            3 -> EdgeNavigation()
+            4 -> RightAndLeftNavigation()
+            5 -> DisabledNavigation()
+            else -> defaultNavigation()
+        }
+        navigationModeChangedListener?.invoke()
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerItems.kt

@@ -1,121 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.pager
-
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.setValue
-import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import eu.kanade.tachiyomi.ui.reader.model.InsertPage
-import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
-import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
-import eu.kanade.tachiyomi.ui.reader.viewer.viewerItems
-
-/**
- * Items of a pager, where [ViewerChapters] updates are posted, inverted when the pager [isReversed] reads right to
- * left. Wide pages split in two get an [InsertPage] for their second half.
- */
-class PagerItems(private val isReversed: Boolean) {
-
-    /**
-     * List of currently set items.
-     */
-    var items: List<Any> by mutableStateOf(emptyList())
-        private set
-
-    /**
-     * Holds preprocessed items so they don't get removed when changing chapter
-     */
-    private var preprocessed: List<InsertPage> = emptyList()
-
-    var nextTransition: ChapterTransition.Next? = null
-        private set
-
-    var currentChapter: ReaderChapter? = null
-        private set
-
-    /**
-     * Updates the items with the given [chapters] while the pager is at [currentPosition], and returns where it must
-     * go next.
-     */
-    fun setChapters(chapters: ViewerChapters, forceTransition: Boolean, currentPosition: Int): Update {
-        var insertPageLastPage: InsertPage? = null
-
-        val currPages = chapters.currChapter.pages?.toMutableList()?.also { pages ->
-            val lastPage = pages.last()
-
-            // Insert preprocessed pages into current page list. Pages of the adjacent chapters are split too, and
-            // placed by their index, so only this chapter's belong here.
-            preprocessed.filter { it.chapter.chapter.id == chapters.currChapter.chapter.id }
-                .sortedByDescending { it.index }
-                .forEach { page ->
-                    if (lastPage.index == page.index) {
-                        insertPageLastPage = page
-                    }
-                    pages.add(page.index + 1, page)
-                }
-        }
-
-        val newItems = viewerItems(chapters, forceTransition, currPages)
-        currentChapter = chapters.currChapter
-        nextTransition = ChapterTransition.Next(chapters.currChapter, chapters.nextChapter)
-
-        val currentItem = items.getOrNull(currentPosition)
-
-        if (isReversed) {
-            newItems.reverse()
-        }
-
-        val adjacentChapterIds = setOfNotNull(chapters.prevChapter?.chapter?.id, chapters.nextChapter?.chapter?.id)
-        preprocessed = preprocessed.filter { it.chapter.chapter.id in adjacentChapterIds }
-        items = newItems
-
-        // The pager only follows the pages it has laid out, so before its first layout it would stay at the same
-        // position while pages are added in front, e.g. the next chapter's in right to left, and land in another
-        // chapter
-        val position = items.indexOf(currentItem).takeIf { it != -1 && it != currentPosition }
-        return Update(position, insertPageLastPage)
-    }
-
-    /**
-     * Adds [newPage], the second half of [currentPage], and returns whether the items changed.
-     */
-    fun onPageSplit(currentPage: Any?, newPage: InsertPage): Boolean {
-        if (currentPage !is ReaderPage) return false
-
-        val currentIndex = items.indexOf(currentPage)
-
-        // Put aside pages of an adjacent chapter until it becomes the current one, so they are not lost on the change
-        if (currentPage.chapter.chapter.id != currentChapter?.chapter?.id) {
-            val chapterId = newPage.chapter.chapter.id
-            if (preprocessed.none { it.chapter.chapter.id == chapterId && it.index == newPage.index }) {
-                preprocessed = preprocessed + newPage
-            }
-            return false
-        }
-
-        val placeAtIndex = if (isReversed) currentIndex else currentIndex + 1
-
-        // It will enter a endless cycle of insert pages
-        if (isReversed && placeAtIndex - 1 >= 0 && items[placeAtIndex - 1] is InsertPage) {
-            return false
-        }
-
-        // Same here it will enter a endless cycle of insert pages
-        if (items[placeAtIndex] is InsertPage) {
-            return false
-        }
-
-        items = items.toMutableList().apply { add(placeAtIndex, newPage) }
-        return true
-    }
-
-    fun cleanupPageSplit() {
-        items = items.filterNot { it is InsertPage }
-    }
-
-    /**
-     * Where the pager goes after the items change: to [position] to stay on the same item, then to [insertPage] at
-     * the end of the chapter, which it would skip otherwise.
-     */
-    class Update(val position: Int?, val insertPage: InsertPage?)
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerPageHolder.kt

@@ -2,12 +2,16 @@ package eu.kanade.tachiyomi.ui.reader.viewer.pager
 
 import android.annotation.SuppressLint
 import android.content.Context
+import android.view.LayoutInflater
+import androidx.core.view.isVisible
+import eu.kanade.presentation.util.formattedMessage
+import eu.kanade.tachiyomi.databinding.ReaderErrorBinding
 import eu.kanade.tachiyomi.source.model.Page
+import eu.kanade.tachiyomi.ui.reader.model.InsertPage
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageErrorView
 import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView
 import eu.kanade.tachiyomi.ui.reader.viewer.ReaderProgressIndicator
-import eu.kanade.tachiyomi.ui.reader.viewer.processPagedImage
+import eu.kanade.tachiyomi.ui.webview.WebViewActivity
 import eu.kanade.tachiyomi.widget.ViewPagerAdapter
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
@@ -18,8 +22,11 @@ import kotlinx.coroutines.supervisorScope
 import kotlinx.coroutines.withContext
 import logcat.LogPriority
 import okio.Buffer
+import okio.BufferedSource
+import tachiyomi.core.common.i18n.stringResource
 import tachiyomi.core.common.util.system.ImageUtil
 import tachiyomi.core.common.util.system.logcat
+import tachiyomi.i18n.MR
 
 /**
  * View of the ViewPager that contains a page of a chapter.
@@ -45,7 +52,7 @@ class PagerPageHolder(
     /**
      * Error layout to show when the image fails to load.
      */
-    private var errorLayout: ReaderPageErrorView? = null
+    private var errorLayout: ReaderErrorBinding? = null
 
     private val scope = MainScope()
 
@@ -55,7 +62,6 @@ class PagerPageHolder(
     private var loadJob: Job? = null
 
     init {
-        pageColorFilter = viewer.pageColorFilter
         loadJob = scope.launch { loadPageAndProcessStatus() }
     }
 
@@ -146,11 +152,9 @@ class PagerPageHolder(
             val buffer = withContext(Dispatchers.IO) { streamFn().use { Buffer().readFrom(it) } }
             // Splitting, merging and sampling the background decode the image, which is CPU work
             val (source, isAnimated, background) = withContext(Dispatchers.Default) {
-                val source = viewer.simplePaged.processPagedImage(item, buffer, viewer is L2RPagerViewer) {
-                    viewer.onPageSplit(item, it)
-                }
+                val source = process(item, buffer)
                 val isAnimated = ImageUtil.isAnimatedAndSupported(source)
-                val background = if (!isAnimated && viewer.general.automaticBackground) {
+                val background = if (!isAnimated && viewer.config.automaticBackground) {
                     ImageUtil.chooseBackground(context, source.peek().inputStream())
                 } else {
                     null
@@ -162,11 +166,11 @@ class PagerPageHolder(
                     source,
                     isAnimated,
                     Config(
-                        zoomDuration = viewer.general.doubleTapAnimDuration,
-                        minimumScaleType = viewer.paged.page.imageScaleType.value,
-                        cropBorders = viewer.paged.page.cropBorders,
-                        zoomStartPosition = viewer.imageZoomType,
-                        landscapeZoom = viewer.paged.page.landscapeZoom,
+                        zoomDuration = viewer.config.doubleTapAnimDuration,
+                        minimumScaleType = viewer.config.imageScaleType,
+                        cropBorders = viewer.config.imageCropBorders,
+                        zoomStartPosition = viewer.config.imageZoomType,
+                        landscapeZoom = viewer.config.landscapeZoom,
                     ),
                 )
                 if (!isAnimated) {
@@ -182,6 +186,63 @@ class PagerPageHolder(
         }
     }
 
+    private fun process(page: ReaderPage, imageSource: BufferedSource): BufferedSource {
+        if (viewer.config.dualPageRotateToFit) {
+            return rotateDualPage(imageSource)
+        }
+
+        if (!viewer.config.dualPageSplit) {
+            return imageSource
+        }
+
+        if (page is InsertPage) {
+            return splitInHalf(imageSource)
+        }
+
+        val isDoublePage = ImageUtil.isWideImage(imageSource)
+        if (!isDoublePage) {
+            return imageSource
+        }
+
+        onPageSplit(page)
+
+        return splitInHalf(imageSource)
+    }
+
+    private fun rotateDualPage(imageSource: BufferedSource): BufferedSource {
+        val isDoublePage = ImageUtil.isWideImage(imageSource)
+        return if (isDoublePage) {
+            val rotation = if (viewer.config.dualPageRotateToFitInvert) -90f else 90f
+            ImageUtil.rotateImage(imageSource, rotation)
+        } else {
+            imageSource
+        }
+    }
+
+    private fun splitInHalf(imageSource: BufferedSource): BufferedSource {
+        var side = when {
+            viewer is L2RPagerViewer && page is InsertPage -> ImageUtil.Side.RIGHT
+            viewer !is L2RPagerViewer && page is InsertPage -> ImageUtil.Side.LEFT
+            viewer is L2RPagerViewer && page !is InsertPage -> ImageUtil.Side.LEFT
+            viewer !is L2RPagerViewer && page !is InsertPage -> ImageUtil.Side.RIGHT
+            else -> error("We should choose a side!")
+        }
+
+        if (viewer.config.dualPageInvert) {
+            side = when (side) {
+                ImageUtil.Side.RIGHT -> ImageUtil.Side.LEFT
+                ImageUtil.Side.LEFT -> ImageUtil.Side.RIGHT
+            }
+        }
+
+        return ImageUtil.splitInHalf(imageSource, side)
+    }
+
+    private fun onPageSplit(page: ReaderPage) {
+        val newPage = InsertPage(page)
+        viewer.onPageSplit(page, newPage)
+    }
+
     /**
      * Called when the page has an error.
      */
@@ -211,24 +272,41 @@ class PagerPageHolder(
         viewer.activity.hideMenu()
     }
 
-    private fun showErrorLayout(error: Throwable?) {
-        val errorLayout = errorLayout ?: ReaderPageErrorView(context).also {
-            addView(it, LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT))
-            errorLayout = it
+    private fun showErrorLayout(error: Throwable?): ReaderErrorBinding {
+        if (errorLayout == null) {
+            errorLayout = ReaderErrorBinding.inflate(LayoutInflater.from(context), this, true)
+            errorLayout?.actionRetry?.viewer = viewer
+            errorLayout?.actionRetry?.setOnClickListener {
+                page.chapter.pageLoader?.retryPage(page)
+            }
         }
-        errorLayout.bind(
-            page = page,
-            error = error,
-            sourceId = viewer.activity.viewModel.manga?.source,
-            onButtonPressChange = { pressed -> viewer.pager.setGestureDetectorEnabled(!pressed) },
-        )
+
+        val imageUrl = page.imageUrl
+        errorLayout?.actionOpenInWebView?.isVisible = imageUrl != null
+        if (imageUrl != null) {
+            if (imageUrl.startsWith("http", true)) {
+                errorLayout?.actionOpenInWebView?.viewer = viewer
+                errorLayout?.actionOpenInWebView?.setOnClickListener {
+                    val sourceId = viewer.activity.viewModel.manga?.source
+
+                    val intent = WebViewActivity.newIntent(context, imageUrl, sourceId)
+                    context.startActivity(intent)
+                }
+            }
+        }
+
+        errorLayout?.errorMessage?.text = with(context) { error?.formattedMessage }
+            ?: context.stringResource(MR.strings.decode_image_error)
+
+        errorLayout?.root?.isVisible = true
+        return errorLayout!!
     }
 
     /**
      * Removes the decode error layout from the holder, if found.
      */
     private fun removeErrorLayout() {
-        errorLayout?.let(::removeView)
+        errorLayout?.root?.isVisible = false
         errorLayout = null
     }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerPageTracker.kt

@@ -1,151 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.pager
-
-import eu.kanade.tachiyomi.ui.reader.ReaderActivity
-import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import eu.kanade.tachiyomi.ui.reader.model.InsertPage
-import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
-import tachiyomi.core.common.util.system.logcat
-
-/**
- * The item a pager of [items] is on, shared by the view and Compose pagers. It tells [activity] of each new page,
- * preloads the chapters around it, and gives [onPageHolderSelected] the page along with whether it was reached moving
- * forward. Chapters set while the pager moves are held until it's idle and then given to [setChaptersNow].
- */
-class PagerPageTracker(
-    private val activity: ReaderActivity,
-    private val items: PagerItems,
-    private val setChaptersNow: (ViewerChapters) -> Unit,
-    private val onPageHolderSelected: (page: ReaderPage, forward: Boolean) -> Unit,
-) {
-
-    /**
-     * Currently active item. It can be a chapter page or a chapter transition.
-     */
-    var currentPage: Any? = null
-        private set
-
-    /**
-     * Viewer chapters to set when the pager enters idle mode. Otherwise, if the view was settling
-     * or dragging, there'd be a noticeable and annoying jump.
-     */
-    private var awaitingIdleViewerChapters: ViewerChapters? = null
-
-    /**
-     * Whether the pager is currently in idle mode. It sets the awaiting chapters if setting
-     * this field to true.
-     */
-    var isIdle = true
-        set(value) {
-            field = value
-            if (value) {
-                awaitingIdleViewerChapters?.let { viewerChapters ->
-                    setChaptersNow(viewerChapters)
-                    awaitingIdleViewerChapters = null
-                    if (viewerChapters.currChapter.pages?.size == 1) {
-                        items.nextTransition?.to?.let(activity::requestPreloadChapter)
-                    }
-                }
-            }
-        }
-
-    /**
-     * Sets the given [chapters] now if the pager is idle, otherwise once it becomes idle.
-     */
-    fun setChapters(chapters: ViewerChapters) {
-        if (isIdle) {
-            setChaptersNow(chapters)
-        } else {
-            awaitingIdleViewerChapters = chapters
-        }
-    }
-
-    /**
-     * Called when a new page (either a [ReaderPage] or [ChapterTransition]) is marked as active
-     */
-    fun onPageChange(position: Int) {
-        val page = items.items.getOrNull(position)
-        if (page != null && currentPage != page) {
-            val allowPreload = checkAllowPreload(page as? ReaderPage)
-            val forward = when {
-                currentPage is ReaderPage && page is ReaderPage -> {
-                    // if both pages have the same number, it's a split page with an InsertPage
-                    if (page.number == (currentPage as ReaderPage).number) {
-                        // the InsertPage is always the second in the reading direction
-                        page is InsertPage
-                    } else {
-                        page.number > (currentPage as ReaderPage).number
-                    }
-                }
-                currentPage is ChapterTransition.Prev && page is ReaderPage ->
-                    false
-                else -> true
-            }
-            currentPage = page
-            when (page) {
-                is ReaderPage -> onReaderPageSelected(page, allowPreload, forward)
-                is ChapterTransition -> onTransitionSelected(page)
-            }
-        }
-    }
-
-    private fun checkAllowPreload(page: ReaderPage?): Boolean {
-        // Page is transition page - preload allowed
-        page ?: return true
-
-        // Initial opening - preload allowed
-        currentPage ?: return true
-
-        // Allow preload for
-        // 1. Going to next chapter from chapter transition
-        // 2. Going between pages of same chapter
-        // 3. Next chapter page
-        return when (page.chapter) {
-            (currentPage as? ChapterTransition.Next)?.to -> true
-            (currentPage as? ReaderPage)?.chapter -> true
-            items.nextTransition?.to -> true
-            else -> false
-        }
-    }
-
-    /**
-     * Called when a [ReaderPage] is marked as active. It notifies the
-     * activity of the change and requests the preload of the next chapter if this is the last page.
-     */
-    private fun onReaderPageSelected(page: ReaderPage, allowPreload: Boolean, forward: Boolean) {
-        val pages = page.chapter.pages ?: return
-        logcat { "onReaderPageSelected: ${page.number}/${pages.size}" }
-        activity.onPageSelected(page)
-
-        // Notify holder of page change
-        onPageHolderSelected(page, forward)
-
-        // Skip preload on inserts it causes unwanted page jumping
-        if (page is InsertPage) {
-            return
-        }
-
-        // Preload next chapter once we're within the last 5 pages of the current chapter
-        val inPreloadRange = pages.size - page.number < 5
-        if (inPreloadRange && allowPreload && page.chapter == items.currentChapter) {
-            logcat { "Request preload next chapter because we're at page ${page.number} of ${pages.size}" }
-            items.nextTransition?.to?.let(activity::requestPreloadChapter)
-        }
-    }
-
-    /**
-     * Called when a [ChapterTransition] is marked as active. It request the
-     * preload of the destination chapter of the transition.
-     */
-    private fun onTransitionSelected(transition: ChapterTransition) {
-        logcat { "onTransitionSelected: $transition" }
-        val toChapter = transition.to
-        if (toChapter != null) {
-            logcat { "Request preload destination chapter because we're on the transition" }
-            activity.requestPreloadChapter(toChapter)
-        } else if (transition is ChapterTransition.Next) {
-            // No more chapters, show menu because the user is probably going to close the reader
-            activity.showMenu()
-        }
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerTransitionHolder.kt

@@ -3,12 +3,25 @@ package eu.kanade.tachiyomi.ui.reader.viewer.pager
 import android.annotation.SuppressLint
 import android.content.Context
 import android.view.Gravity
+import android.view.View
+import android.view.ViewGroup
+import android.view.ViewGroup.LayoutParams.MATCH_PARENT
+import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
 import android.widget.LinearLayout
+import androidx.appcompat.widget.AppCompatTextView
+import com.google.android.material.progressindicator.CircularProgressIndicator
 import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
+import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
+import eu.kanade.tachiyomi.ui.reader.viewer.ReaderButton
 import eu.kanade.tachiyomi.ui.reader.viewer.ReaderTransitionView
-import eu.kanade.tachiyomi.ui.reader.viewer.transitionDownloadState
 import eu.kanade.tachiyomi.util.system.dpToPx
 import eu.kanade.tachiyomi.widget.ViewPagerAdapter
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
+import tachiyomi.core.common.i18n.stringResource
+import tachiyomi.i18n.MR
 
 /**
  * View of the ViewPager that contains a chapter transition.
@@ -20,12 +33,25 @@ class PagerTransitionHolder(
     val transition: ChapterTransition,
 ) : LinearLayout(readerThemedContext), ViewPagerAdapter.PositionableView {
 
+    private val scope = MainScope()
+    private var stateJob: Job? = null
+
     /**
      * Item that identifies this view. Needed by the adapter to not recreate views.
      */
     override val item: Any
         get() = transition
 
+    /**
+     * View container of the current status of the transition page. Child views will be added
+     * dynamically.
+     */
+    private var pagesContainer = LinearLayout(context).apply {
+        layoutParams = LayoutParams(MATCH_PARENT, WRAP_CONTENT)
+        orientation = VERTICAL
+        gravity = Gravity.CENTER
+    }
+
     init {
         orientation = VERTICAL
         gravity = Gravity.CENTER
@@ -34,16 +60,92 @@ class PagerTransitionHolder(
 
         val transitionView = ReaderTransitionView(context)
         addView(transitionView)
+        addView(pagesContainer)
 
         transitionView.bind(
-            transition = transition,
-            downloadState = viewer.downloadManager.transitionDownloadState(
-                transition,
-                viewer.activity.viewModel.manga,
-                viewer.activity.viewModel.source,
-            ),
-            onRetry = viewer.activity::requestPreloadChapter,
-            onButtonPressChange = { pressed -> viewer.pager.setGestureDetectorEnabled(!pressed) },
+            transition,
+            viewer.downloadManager,
+            viewer.activity.viewModel.manga,
+            viewer.activity.viewModel.source,
         )
+
+        transition.to?.let(::observeStatus)
+    }
+
+    /**
+     * Called when this view is detached from the window. Unsubscribes any active subscription.
+     */
+    override fun onDetachedFromWindow() {
+        super.onDetachedFromWindow()
+        stateJob?.cancel()
+    }
+
+    /**
+     * Observes the status of the page list of the next/previous chapter. Whenever there's a new
+     * state, the pages container is cleaned up before setting the new state.
+     */
+    private fun observeStatus(chapter: ReaderChapter) {
+        stateJob?.cancel()
+        stateJob = scope.launch {
+            chapter.stateFlow
+                .collectLatest { state ->
+                    pagesContainer.removeAllViews()
+                    when (state) {
+                        is ReaderChapter.State.Loading -> setLoading()
+                        is ReaderChapter.State.Error -> setError(state.error)
+                        is ReaderChapter.State.Wait, is ReaderChapter.State.Loaded -> {
+                            // No additional view is added
+                        }
+                    }
+                }
+        }
+    }
+
+    /**
+     * Sets the loading state on the pages container.
+     */
+    private fun setLoading() {
+        val progress = CircularProgressIndicator(context)
+        progress.isIndeterminate = true
+
+        val textView = AppCompatTextView(context).apply {
+            wrapContent()
+            text = context.stringResource(MR.strings.transition_pages_loading)
+        }
+
+        pagesContainer.addView(progress)
+        pagesContainer.addView(textView)
+    }
+
+    /**
+     * Sets the error state on the pages container.
+     */
+    private fun setError(error: Throwable) {
+        val textView = AppCompatTextView(context).apply {
+            wrapContent()
+            text = context.stringResource(MR.strings.transition_pages_error, error.message ?: "")
+        }
+
+        val retryBtn = ReaderButton(context).apply {
+            viewer = this@PagerTransitionHolder.viewer
+            wrapContent()
+            text = context.stringResource(MR.strings.action_retry)
+            setOnClickListener {
+                val toChapter = transition.to
+                if (toChapter != null) {
+                    this@PagerTransitionHolder.viewer.activity.requestPreloadChapter(toChapter)
+                }
+            }
+        }
+
+        pagesContainer.addView(textView)
+        pagesContainer.addView(retryBtn)
+    }
+
+    /**
+     * Extension method to set layout params to wrap content on this view.
+     */
+    private fun View.wrapContent() {
+        layoutParams = ViewGroup.LayoutParams(WRAP_CONTENT, WRAP_CONTENT)
     }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerViewer.kt

@@ -1,17 +1,11 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.pager
 
-import android.content.Context
-import android.graphics.ColorFilter
-import android.view.ViewGroup
+import android.graphics.PointF
+import android.view.InputDevice
+import android.view.KeyEvent
+import android.view.MotionEvent
+import android.view.View
 import android.view.ViewGroup.LayoutParams
-import android.widget.FrameLayout
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.SideEffect
-import androidx.compose.runtime.remember
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.graphics.asAndroidColorFilter
-import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.view.children
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
@@ -22,14 +16,8 @@ import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
 import eu.kanade.tachiyomi.ui.reader.model.InsertPage
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
-import eu.kanade.tachiyomi.ui.reader.setting.GeneralSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.LocalPageColorFilter
-import eu.kanade.tachiyomi.ui.reader.viewer.PagedSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView.ZoomStartPosition
 import eu.kanade.tachiyomi.ui.reader.viewer.Viewer
-import eu.kanade.tachiyomi.ui.reader.viewer.collectChanges
-import eu.kanade.tachiyomi.ui.reader.viewer.mouseWheelPaging
-import eu.kanade.tachiyomi.ui.reader.viewer.position
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation.NavigationRegion
 import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.cancel
 import mihon.app.di.appGraph
@@ -44,6 +32,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
 
     val graph by lazy { activity.appGraph }
     val downloadManager by lazy { graph.downloadManager }
+    val readerPreferences by lazy { graph.readerPreferences }
 
     private val scope = MainScope()
 
@@ -53,56 +42,55 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
      */
     val pager = createPager()
 
-    private val settingsViewModel = activity.settingsViewModel
-
     /**
-     * Settings every paged viewer uses, like scale mode on images or tap zones.
+     * Configuration used by the pager, like allow taps, scale mode on images, page transitions...
      */
-    val paged: PagedSettings
-        get() = settingsViewModel.paged.value
-
-    /**
-     * Settings only the pager viewers use, like splitting double pages.
-     */
-    val simplePaged: SimplePagedSettings
-        get() = settingsViewModel.simplePaged.value
-
-    /**
-     * Settings shared by every viewer, like allow taps or page transitions.
-     */
-    val general: GeneralSettings
-        get() = settingsViewModel.general.value
-
-    val imageZoomType: ZoomStartPosition
-        get() = paged.page.zoomStart.position(
-            auto = when (this) {
-                is L2RPagerViewer -> ZoomStartPosition.LEFT
-                is R2LPagerViewer -> ZoomStartPosition.RIGHT
-                else -> ZoomStartPosition.CENTER
-            },
-        )
-
-    private val pagerItems = PagerItems(isReversed = this is R2LPagerViewer)
+    val config = PagerConfig(this, scope, readerPreferences)
 
     /**
      * Adapter of the pager.
      */
-    private val adapter = PagerViewerAdapter(this, pagerItems)
+    private val adapter = PagerViewerAdapter(this)
 
-    private val tracker = PagerPageTracker(activity, pagerItems, ::setChaptersInternal) { page, forward ->
-        getPageHolder(page)?.onPageSelected(forward)
-    }
+    /**
+     * Currently active item. It can be a chapter page or a chapter transition.
+     */
+    private var currentPage: Any? = null
+
+    /**
+     * Viewer chapters to set when the pager enters idle mode. Otherwise, if the view was settling
+     * or dragging, there'd be a noticeable and annoying jump.
+     */
+    private var awaitingIdleViewerChapters: ViewerChapters? = null
+
+    /**
+     * Whether the view pager is currently in idle mode. It sets the awaiting chapters if setting
+     * this field to true.
+     */
+    private var isIdle = true
+        set(value) {
+            field = value
+            if (value) {
+                awaitingIdleViewerChapters?.let { viewerChapters ->
+                    setChaptersInternal(viewerChapters)
+                    awaitingIdleViewerChapters = null
+                    if (viewerChapters.currChapter.pages?.size == 1) {
+                        adapter.nextTransition?.to?.let(activity::requestPreloadChapter)
+                    }
+                }
+            }
+        }
 
     private val pagerListener = object : ViewPager.SimpleOnPageChangeListener() {
         override fun onPageSelected(position: Int) {
             if (!activity.isScrollingThroughPages) {
                 activity.hideMenu()
             }
-            tracker.onPageChange(position)
+            onPageChange(position)
         }
 
         override fun onPageScrollStateChanged(state: Int) {
-            tracker.isIdle = state == ViewPager.SCROLL_STATE_IDLE
+            isIdle = state == ViewPager.SCROLL_STATE_IDLE
         }
     }
 
@@ -110,7 +98,6 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
         pager.isVisible = false // Don't layout the pager yet
         pager.layoutParams = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)
         pager.isFocusable = false
-        pager.descendantFocusability = ViewGroup.FOCUS_BLOCK_DESCENDANTS
         pager.offscreenPageLimit = 1
         pager.id = R.id.reader_pager
         pager.adapter = adapter
@@ -120,14 +107,20 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
             pager.getLocationOnScreen(viewPosition)
             val viewPositionRelativeToWindow = IntArray(2)
             pager.getLocationInWindow(viewPositionRelativeToWindow)
-            val pos = Offset(
+            val pos = PointF(
                 (event.rawX - viewPosition[0] + viewPositionRelativeToWindow[0]) / pager.width,
                 (event.rawY - viewPosition[1] + viewPositionRelativeToWindow[1]) / pager.height,
             )
-            activity.onViewerTap(pos)
+            when (config.navigator.getAction(pos)) {
+                NavigationRegion.MENU -> activity.toggleMenu()
+                NavigationRegion.NEXT -> moveToNext()
+                NavigationRegion.PREV -> moveToPrevious()
+                NavigationRegion.RIGHT -> moveRight()
+                NavigationRegion.LEFT -> moveLeft()
+            }
         }
         pager.longTapListener = f@{
-            if (activity.viewModel.state.value.menuVisible || general.longTapEnabled) {
+            if (activity.viewModel.state.value.menuVisible || config.longTapEnabled) {
                 val item = adapter.items.getOrNull(pager.currentItem)
                 if (item is ReaderPage) {
                     activity.onPageLongTap(item)
@@ -137,23 +130,19 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
             false
         }
 
-        settingsViewModel.general.collectChanges(scope) { old, new ->
-            if (old != null && old.theme != new.theme) {
-                refreshAdapter()
-            }
-        }
-        settingsViewModel.simplePaged.collectChanges(scope) { old, new ->
-            if (old != null) {
-                refreshAdapter()
-            }
-            if (old?.dualPageSplit != new.dualPageSplit && !new.dualPageSplit) {
+        config.dualPageSplitChangedListener = { enabled ->
+            if (!enabled) {
                 cleanupPageSplit()
             }
         }
-        settingsViewModel.paged.collectChanges(scope) { old, new ->
-            if (old != null && old.page != new.page) {
-                refreshAdapter()
-            }
+
+        config.imagePropertyChangedListener = {
+            refreshAdapter()
+        }
+
+        config.navigationModeChangedListener = {
+            val showOnStart = config.navigationOverlayOnStart || config.forceNavigationOverlay
+            activity.binding.navigationOverlay.setNavigation(config.navigator, showOnStart)
         }
     }
 
@@ -167,23 +156,11 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
      */
     abstract fun createPager(): Pager
 
-    /** The page images' colours, for holders made later - see [LocalPageColorFilter]. */
-    var pageColorFilter: ColorFilter? = null
-        private set
-
-    @Composable
-    override fun Content(modifier: Modifier) {
-        val filter = LocalPageColorFilter.current
-        val pageFilter = remember(filter) { filter?.asAndroidColorFilter() }
-        SideEffect {
-            pageColorFilter = pageFilter
-            // The pager keeps every page it holds as a child.
-            pager.children.filterIsInstance<PagerPageHolder>().forEach { it.pageColorFilter = pageFilter }
-        }
-        AndroidView(
-            factory = { context -> DisallowInterceptBarrier(context).apply { addView(pager) } },
-            modifier = modifier.mouseWheelPaging(this),
-        )
+    /**
+     * Returns the view this viewer uses.
+     */
+    override fun getView(): View {
+        return pager
     }
 
     /**
@@ -194,12 +171,105 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
             .filterIsInstance(PagerPageHolder::class.java)
             .firstOrNull { it.item == page }
 
+    /**
+     * Called when a new page (either a [ReaderPage] or [ChapterTransition]) is marked as active
+     */
+    private fun onPageChange(position: Int) {
+        val page = adapter.items.getOrNull(position)
+        if (page != null && currentPage != page) {
+            val allowPreload = checkAllowPreload(page as? ReaderPage)
+            val forward = when {
+                currentPage is ReaderPage && page is ReaderPage -> {
+                    // if both pages have the same number, it's a split page with an InsertPage
+                    if (page.number == (currentPage as ReaderPage).number) {
+                        // the InsertPage is always the second in the reading direction
+                        page is InsertPage
+                    } else {
+                        page.number > (currentPage as ReaderPage).number
+                    }
+                }
+                currentPage is ChapterTransition.Prev && page is ReaderPage ->
+                    false
+                else -> true
+            }
+            currentPage = page
+            when (page) {
+                is ReaderPage -> onReaderPageSelected(page, allowPreload, forward)
+                is ChapterTransition -> onTransitionSelected(page)
+            }
+        }
+    }
+
+    private fun checkAllowPreload(page: ReaderPage?): Boolean {
+        // Page is transition page - preload allowed
+        page ?: return true
+
+        // Initial opening - preload allowed
+        currentPage ?: return true
+
+        // Allow preload for
+        // 1. Going to next chapter from chapter transition
+        // 2. Going between pages of same chapter
+        // 3. Next chapter page
+        return when (page.chapter) {
+            (currentPage as? ChapterTransition.Next)?.to -> true
+            (currentPage as? ReaderPage)?.chapter -> true
+            adapter.nextTransition?.to -> true
+            else -> false
+        }
+    }
+
+    /**
+     * Called when a [ReaderPage] is marked as active. It notifies the
+     * activity of the change and requests the preload of the next chapter if this is the last page.
+     */
+    private fun onReaderPageSelected(page: ReaderPage, allowPreload: Boolean, forward: Boolean) {
+        val pages = page.chapter.pages ?: return
+        logcat { "onReaderPageSelected: ${page.number}/${pages.size}" }
+        activity.onPageSelected(page)
+
+        // Notify holder of page change
+        getPageHolder(page)?.onPageSelected(forward)
+
+        // Skip preload on inserts it causes unwanted page jumping
+        if (page is InsertPage) {
+            return
+        }
+
+        // Preload next chapter once we're within the last 5 pages of the current chapter
+        val inPreloadRange = pages.size - page.number < 5
+        if (inPreloadRange && allowPreload && page.chapter == adapter.currentChapter) {
+            logcat { "Request preload next chapter because we're at page ${page.number} of ${pages.size}" }
+            adapter.nextTransition?.to?.let(activity::requestPreloadChapter)
+        }
+    }
+
+    /**
+     * Called when a [ChapterTransition] is marked as active. It request the
+     * preload of the destination chapter of the transition.
+     */
+    private fun onTransitionSelected(transition: ChapterTransition) {
+        logcat { "onTransitionSelected: $transition" }
+        val toChapter = transition.to
+        if (toChapter != null) {
+            logcat { "Request preload destination chapter because we're on the transition" }
+            activity.requestPreloadChapter(toChapter)
+        } else if (transition is ChapterTransition.Next) {
+            // No more chapters, show menu because the user is probably going to close the reader
+            activity.showMenu()
+        }
+    }
+
     /**
      * Tells this viewer to set the given [chapters] as active. If the pager is currently idle,
      * it sets the chapters immediately, otherwise they are saved and set when it becomes idle.
      */
     override fun setChapters(chapters: ViewerChapters) {
-        tracker.setChapters(chapters)
+        if (isIdle) {
+            setChaptersInternal(chapters)
+        } else {
+            awaitingIdleViewerChapters = chapters
+        }
     }
 
     /**
@@ -209,7 +279,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
         // Remove listener so the change in item doesn't trigger it
         pager.removeOnPageChangeListener(pagerListener)
 
-        val forceTransition = general.alwaysShowChapterTransition ||
+        val forceTransition = config.alwaysShowChapterTransition ||
             adapter.items.getOrNull(pager.currentItem) is ChapterTransition
         adapter.setChapters(chapters, forceTransition)
 
@@ -223,7 +293,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
 
         pager.addOnPageChangeListener(pagerListener)
         // Manually call onPageChange to update the UI
-        tracker.onPageChange(pager.currentItem)
+        onPageChange(pager.currentItem)
     }
 
     /**
@@ -236,7 +306,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
             pager.setCurrentItem(position, true)
             // manually call onPageChange since ViewPager listener is not triggered in this case
             if (currentPosition == position) {
-                tracker.onPageChange(position)
+                onPageChange(position)
             }
         } else {
             logcat { "Page $page not found in adapter" }
@@ -244,24 +314,29 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
     }
 
     /**
-     * Whether pages run right to left, so moving forward goes left.
+     * Moves to the next page.
      */
-    protected open val isReversed = false
+    open fun moveToNext() {
+        moveRight()
+    }
 
-    override fun moveForward() = if (isReversed) moveLeft() else moveRight()
-
-    override fun moveBackward() = if (isReversed) moveRight() else moveLeft()
+    /**
+     * Moves to the previous page.
+     */
+    open fun moveToPrevious() {
+        moveLeft()
+    }
 
     /**
      * Moves to the page at the right.
      */
-    private fun moveRight() {
+    protected open fun moveRight() {
         if (pager.currentItem != adapter.count - 1) {
-            val holder = (tracker.currentPage as? ReaderPage)?.let(::getPageHolder)
-            if (holder != null && paged.navigateToPan && holder.canPanRight()) {
+            val holder = (currentPage as? ReaderPage)?.let(::getPageHolder)
+            if (holder != null && config.navigateToPan && holder.canPanRight()) {
                 holder.panRight()
             } else {
-                pager.setCurrentItem(pager.currentItem + 1, general.usePageTransitions)
+                pager.setCurrentItem(pager.currentItem + 1, config.usePageTransitions)
             }
         }
     }
@@ -269,17 +344,31 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
     /**
      * Moves to the page at the left.
      */
-    private fun moveLeft() {
+    protected open fun moveLeft() {
         if (pager.currentItem != 0) {
-            val holder = (tracker.currentPage as? ReaderPage)?.let(::getPageHolder)
-            if (holder != null && paged.navigateToPan && holder.canPanLeft()) {
+            val holder = (currentPage as? ReaderPage)?.let(::getPageHolder)
+            if (holder != null && config.navigateToPan && holder.canPanLeft()) {
                 holder.panLeft()
             } else {
-                pager.setCurrentItem(pager.currentItem - 1, general.usePageTransitions)
+                pager.setCurrentItem(pager.currentItem - 1, config.usePageTransitions)
             }
         }
     }
 
+    /**
+     * Moves to the page at the top (or previous).
+     */
+    protected open fun moveUp() {
+        moveToPrevious()
+    }
+
+    /**
+     * Moves to the page at the bottom (or next).
+     */
+    protected open fun moveDown() {
+        moveToNext()
+    }
+
     /**
      * Resets the adapter in order to recreate all the views. Used when a image configuration is
      * changed.
@@ -291,6 +380,69 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
         pager.setCurrentItem(currentItem, false)
     }
 
+    /**
+     * Called from the containing activity when a key [event] is received. It should return true
+     * if the event was handled, false otherwise.
+     */
+    override fun handleKeyEvent(event: KeyEvent): Boolean {
+        val isUp = event.action == KeyEvent.ACTION_UP
+        val ctrlPressed = event.metaState.and(KeyEvent.META_CTRL_ON) > 0
+
+        when (event.keyCode) {
+            KeyEvent.KEYCODE_VOLUME_DOWN -> {
+                if (!config.volumeKeysEnabled || activity.viewModel.state.value.menuVisible) {
+                    return false
+                } else if (isUp) {
+                    if (!config.volumeKeysInverted) moveDown() else moveUp()
+                }
+            }
+            KeyEvent.KEYCODE_VOLUME_UP -> {
+                if (!config.volumeKeysEnabled || activity.viewModel.state.value.menuVisible) {
+                    return false
+                } else if (isUp) {
+                    if (!config.volumeKeysInverted) moveUp() else moveDown()
+                }
+            }
+            KeyEvent.KEYCODE_DPAD_RIGHT -> {
+                if (isUp) {
+                    if (ctrlPressed) moveToNext() else moveRight()
+                }
+            }
+            KeyEvent.KEYCODE_DPAD_LEFT -> {
+                if (isUp) {
+                    if (ctrlPressed) moveToPrevious() else moveLeft()
+                }
+            }
+            KeyEvent.KEYCODE_DPAD_DOWN -> if (isUp) moveDown()
+            KeyEvent.KEYCODE_DPAD_UP -> if (isUp) moveUp()
+            KeyEvent.KEYCODE_PAGE_DOWN -> if (isUp) moveDown()
+            KeyEvent.KEYCODE_PAGE_UP -> if (isUp) moveUp()
+            KeyEvent.KEYCODE_MENU -> if (isUp) activity.toggleMenu()
+            else -> return false
+        }
+        return true
+    }
+
+    /**
+     * Called from the containing activity when a generic motion [event] is received. It should
+     * return true if the event was handled, false otherwise.
+     */
+    override fun handleGenericMotionEvent(event: MotionEvent): Boolean {
+        if (event.source and InputDevice.SOURCE_CLASS_POINTER != 0) {
+            when (event.action) {
+                MotionEvent.ACTION_SCROLL -> {
+                    if (event.getAxisValue(MotionEvent.AXIS_VSCROLL) < 0.0f) {
+                        moveDown()
+                    } else {
+                        moveUp()
+                    }
+                    return true
+                }
+            }
+        }
+        return false
+    }
+
     fun onPageSplit(currentPage: ReaderPage, newPage: InsertPage) {
         activity.runOnUiThread {
             // Need to insert on UI thread else images will go blank
@@ -302,12 +454,3 @@ abstract class PagerViewer(val activity: ReaderActivity) : Viewer {
         adapter.cleanupPageSplit()
     }
 }
-
-/**
- * Keeps [requestDisallowInterceptTouchEvent] from reaching Compose. Its interop filter cancels the
- * gesture when a child re-allows intercepting mid-drag, which stops a zoomed page from handing the
- * drag to the pager at its edge.
- */
-private class DisallowInterceptBarrier(context: Context) : FrameLayout(context) {
-    override fun requestDisallowInterceptTouchEvent(disallowIntercept: Boolean) = Unit
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerViewerAdapter.kt

@@ -4,8 +4,10 @@ import android.view.View
 import android.view.ViewGroup
 import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
 import eu.kanade.tachiyomi.ui.reader.model.InsertPage
+import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
+import eu.kanade.tachiyomi.ui.reader.viewer.calculateChapterGap
 import eu.kanade.tachiyomi.util.system.createReaderThemeContext
 import eu.kanade.tachiyomi.widget.ViewPagerAdapter
 import tachiyomi.core.common.util.system.logcat
@@ -13,16 +15,23 @@ import tachiyomi.core.common.util.system.logcat
 /**
  * Pager adapter used by this [viewer] to where [ViewerChapters] updates are posted.
  */
-class PagerViewerAdapter(
-    private val viewer: PagerViewer,
-    private val pagerItems: PagerItems,
-) : ViewPagerAdapter() {
+class PagerViewerAdapter(private val viewer: PagerViewer) : ViewPagerAdapter() {
 
     /**
      * List of currently set items.
      */
-    val items: List<Any>
-        get() = pagerItems.items
+    var items: MutableList<Any> = mutableListOf()
+        private set
+
+    /**
+     * Holds preprocessed items so they don't get removed when changing chapter
+     */
+    private var preprocessed: List<InsertPage> = emptyList()
+
+    var nextTransition: ChapterTransition.Next? = null
+        private set
+
+    var currentChapter: ReaderChapter? = null
 
     /**
      * Context that has been wrapped to use the correct theme values based on the
@@ -36,13 +45,85 @@ class PagerViewerAdapter(
      * has R2L direction.
      */
     fun setChapters(chapters: ViewerChapters, forceTransition: Boolean) {
-        val update = pagerItems.setChapters(chapters, forceTransition, viewer.pager.currentItem)
+        val newItems = mutableListOf<Any>()
+
+        // Forces chapter transition if there is missing chapters
+        val prevHasMissingChapters = calculateChapterGap(chapters.currChapter, chapters.prevChapter) > 0
+        val nextHasMissingChapters = calculateChapterGap(chapters.nextChapter, chapters.currChapter) > 0
+
+        // Add previous chapter pages and transition
+        chapters.prevChapter?.pages?.let(newItems::addAll)
+
+        // Skip transition page if the chapter is loaded & current page is not a transition page
+        if (prevHasMissingChapters || forceTransition || chapters.prevChapter?.state !is ReaderChapter.State.Loaded) {
+            newItems.add(ChapterTransition.Prev(chapters.currChapter, chapters.prevChapter))
+        }
+
+        var insertPageLastPage: InsertPage? = null
+
+        // Add current chapter.
+        val currPages = chapters.currChapter.pages
+        if (currPages != null) {
+            val pages = currPages.toMutableList()
+
+            val lastPage = pages.last()
+
+            // Insert preprocessed pages into current page list. Pages of the adjacent chapters are split too, and
+            // placed by their index, so only this chapter's belong here.
+            preprocessed.filter { it.chapter.chapter.id == chapters.currChapter.chapter.id }
+                .sortedByDescending { it.index }
+                .forEach { page ->
+                    if (lastPage.index == page.index) {
+                        insertPageLastPage = page
+                    }
+                    pages.add(page.index + 1, page)
+                }
+
+            newItems.addAll(pages)
+        }
+
+        currentChapter = chapters.currChapter
+
+        // Add next chapter transition and pages.
+        nextTransition = ChapterTransition.Next(chapters.currChapter, chapters.nextChapter)
+            .also {
+                if (
+                    nextHasMissingChapters ||
+                    forceTransition ||
+                    chapters.nextChapter?.state !is ReaderChapter.State.Loaded
+                ) {
+                    newItems.add(it)
+                }
+            }
+
+        chapters.nextChapter?.pages?.let(newItems::addAll)
+
+        val currentItem = items.getOrNull(viewer.pager.currentItem)
+
+        // Resets double-page splits, else insert pages get misplaced
+        items.filterIsInstance<InsertPage>().also { items.removeAll(it) }
+
+        if (viewer is R2LPagerViewer) {
+            newItems.reverse()
+        }
+
+        val adjacentChapterIds = setOfNotNull(chapters.prevChapter?.chapter?.id, chapters.nextChapter?.chapter?.id)
+        preprocessed = preprocessed.filter { it.chapter.chapter.id in adjacentChapterIds }
+        items = newItems
         notifyDataSetChanged()
 
-        update.position?.let { viewer.pager.setCurrentItem(it, false) }
+        // The pager only follows the pages it has created, so before its first layout it would stay at the same
+        // position while pages are added in front, e.g. the next chapter's in right to left, and land in another
+        // chapter
+        val currentPosition = items.indexOf(currentItem)
+        if (currentPosition != -1 && currentPosition != viewer.pager.currentItem) {
+            viewer.pager.setCurrentItem(currentPosition, false)
+        }
 
         // Will skip insert page otherwise
-        update.insertPage?.let(viewer::moveToPage)
+        if (insertPageLastPage != null) {
+            viewer.moveToPage(insertPageLastPage)
+        }
     }
 
     /**
@@ -79,13 +160,44 @@ class PagerViewerAdapter(
     }
 
     fun onPageSplit(currentPage: Any?, newPage: InsertPage) {
-        if (pagerItems.onPageSplit(currentPage, newPage)) {
-            notifyDataSetChanged()
+        if (currentPage !is ReaderPage) return
+
+        val currentIndex = items.indexOf(currentPage)
+
+        // Put aside pages of an adjacent chapter until it becomes the current one, so they are not lost on the change
+        if (currentPage.chapter.chapter.id != currentChapter?.chapter?.id) {
+            val chapterId = newPage.chapter.chapter.id
+            if (preprocessed.none { it.chapter.chapter.id == chapterId && it.index == newPage.index }) {
+                preprocessed = preprocessed + newPage
+            }
+            return
         }
+
+        val placeAtIndex = when (viewer) {
+            is L2RPagerViewer,
+            is VerticalPagerViewer,
+            -> currentIndex + 1
+            else -> currentIndex
+        }
+
+        // It will enter a endless cycle of insert pages
+        if (viewer is R2LPagerViewer && placeAtIndex - 1 >= 0 && items[placeAtIndex - 1] is InsertPage) {
+            return
+        }
+
+        // Same here it will enter a endless cycle of insert pages
+        if (items[placeAtIndex] is InsertPage) {
+            return
+        }
+
+        items.add(placeAtIndex, newPage)
+
+        notifyDataSetChanged()
     }
 
     fun cleanupPageSplit() {
-        pagerItems.cleanupPageSplit()
+        val insertPages = items.filterIsInstance<InsertPage>()
+        items.removeAll(insertPages)
         notifyDataSetChanged()
     }
 

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerViewers.kt

@@ -25,7 +25,19 @@ class R2LPagerViewer(activity: ReaderActivity) : PagerViewer(activity) {
         return Pager(activity)
     }
 
-    override val isReversed = true
+    /**
+     * Moves to the next page. On a R2L pager the next page is the one at the left.
+     */
+    override fun moveToNext() {
+        moveLeft()
+    }
+
+    /**
+     * Moves to the previous page. On a R2L pager the previous page is the one at the right.
+     */
+    override fun moveToPrevious() {
+        moveRight()
+    }
 }
 
 /**

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/SimplePagedSettings.kt

@@ -1,13 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.pager
-
-import eu.kanade.tachiyomi.ui.reader.viewer.DualPageSettings
-
-/**
- * Settings only the pager viewers use, all of them part of what the pages are made with.
- */
-data class SimplePagedSettings(
-    override val dualPageSplit: Boolean,
-    override val dualPageInvert: Boolean,
-    override val dualPageRotateToFit: Boolean,
-    override val dualPageRotateToFitInvert: Boolean,
-) : DualPageSettings

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webgpu/ReaderChromePages.kt

@@ -1,208 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webgpu
-
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.BoxScope
-import androidx.compose.foundation.layout.BoxWithConstraints
-import androidx.compose.foundation.layout.fillMaxHeight
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.wrapContentHeight
-import androidx.compose.material3.LocalContentColor
-import androidx.compose.material3.LocalTextStyle
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.CompositionLocalProvider
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableFloatStateOf
-import androidx.compose.runtime.produceState
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.unit.dp
-import androidx.compose.ui.util.fastCoerceIn
-import ca.mpreg.webgpuviewer.viewer.ComposePageSize
-import ca.mpreg.webgpuviewer.viewer.ImagePage
-import eu.kanade.presentation.reader.ChapterTransition
-import eu.kanade.presentation.reader.ReaderError
-import eu.kanade.presentation.util.formattedMessage
-import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
-import eu.kanade.tachiyomi.ui.reader.viewer.ReaderThemedContent
-import eu.kanade.tachiyomi.ui.webview.WebViewActivity
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
-import tachiyomi.presentation.core.components.CombinedCircularProgressIndicator
-import tachiyomi.source.local.isLocal
-
-/** The side padding `PagerTransitionHolder` gave the same transition view. */
-private const val TRANSITION_SIDE_PADDING = 64
-
-/** The padding `WebtoonTransitionHolder` gave it, which took only the height it needed. */
-private const val STRIP_TRANSITION_SIDE_PADDING = 32
-private const val STRIP_TRANSITION_VERTICAL_PADDING = 128
-
-/** How much of the viewport `WebtoonPageHolder` gave its error layout. */
-private const val STRIP_ERROR_HEIGHT_FRACTION = 0.8f
-
-/** The top margin `WebtoonPageHolder` gave its spinner, as a fraction of the viewport. */
-private const val STRIP_PROGRESS_TOP_FRACTION = 0.25f
-
-/**
- * The reader's own chapter and page chrome, as composables, in the reader's theme.
- *
- * Built on the reader background, which is fixed for the page's life: a theme change rebuilds every
- * page (see [WebGpuViewer]'s image property listener).
- */
-abstract class ReaderComposePage(
-    protected val viewer: WebGpuViewer,
-    size: ComposePageSize = ComposePageSize.Auto,
-) : ImagePage.Compose(size, viewer.readerBackgroundColor()) {
-
-    /**
-     * The theme goes on here because the library's page knows nothing of the app's colours.
-     */
-    @Composable
-    final override fun BoxScope.Content() {
-        ReaderThemedContent(viewer.readerThemedContext) { PageContent() }
-    }
-
-    @Composable
-    protected abstract fun PageContent()
-}
-
-/**
- * A page that failed to load or decode, with the pager's error layout: the message, Retry, and
- * Open in WebView for an image that came off the web.
- */
-class ErrorPage internal constructor(
-    viewer: WebGpuViewer,
-    private val viewerPage: WebGpuViewer.ViewerReaderPage?,
-    private val error: Throwable?,
-) : ReaderComposePage(
-    viewer,
-    // WebtoonPageHolder gave its error layout less than a screen, so the page below shows through.
-    if (viewer is WebGpuViewerContinuous) ComposePageSize.Wrap else ComposePageSize.Auto,
-) {
-
-    @Composable
-    override fun PageContent() {
-        val context = LocalContext.current
-        // As the pager's own error layout: only offered for an image that came off the web.
-        val imageUrl = viewerPage?.page?.imageUrl?.takeIf { it.startsWith("http", ignoreCase = true) }
-        val strip = if (viewer is WebGpuViewerContinuous) {
-            Modifier.fillMaxHeight(STRIP_ERROR_HEIGHT_FRACTION).wrapContentHeight()
-        } else {
-            Modifier
-        }
-
-        ReaderError(
-            modifier = strip,
-            message = with(context) { error?.formattedMessage },
-            onRetry = { viewerPage?.let { viewer.retryLoad(it) } },
-            onOpenInWebView = imageUrl?.let {
-                {
-                    val sourceId = viewer.activity.viewModel.manga?.source
-                    context.startActivity(WebViewActivity.newIntent(context, it, sourceId))
-                }
-            },
-        )
-    }
-}
-
-/** A page still downloading: the reader's progress ring. */
-class ProgressPage(viewer: WebGpuViewer) : ReaderComposePage(viewer) {
-
-    /**
-     * 0 to 1. On the page, not in the composition, which is dropped when the page goes out of
-     * reach. Written from the loader's collector; snapshot state takes writes from any thread.
-     */
-    var progress: Float
-        get() = progressState
-        set(value) {
-            progressState = value.fastCoerceIn(0f, 1f)
-        }
-
-    private var progressState by mutableFloatStateOf(0f)
-
-    @Composable
-    override fun PageContent() {
-        if (viewer !is WebGpuViewerContinuous) {
-            CombinedCircularProgressIndicator(progress = { progress })
-            return
-        }
-        // WebtoonPageHolder centred its spinner below a quarter-height top margin, which puts it
-        // at five eighths of the slot rather than halfway down.
-        BoxWithConstraints(modifier = Modifier.fillMaxSize()) {
-            Box(
-                modifier = Modifier
-                    .fillMaxSize()
-                    .padding(top = maxHeight * STRIP_PROGRESS_TOP_FRACTION),
-                contentAlignment = Alignment.Center,
-            ) {
-                CombinedCircularProgressIndicator(progress = { progress })
-            }
-        }
-    }
-}
-
-/** The page between two chapters, or before the first and after the last. */
-class TransitionPage(
-    viewer: WebGpuViewer,
-    val prevChapter: ReaderChapter?,
-    val nextChapter: ReaderChapter?,
-) : ReaderComposePage(viewer, ComposePageSize.Wrap) {
-
-    /** As the pager and webtoon adapters framed it: leaving [prevChapter] for [nextChapter]. */
-    private val transition: ChapterTransition? = when {
-        prevChapter != null -> ChapterTransition.Next(prevChapter, nextChapter)
-        nextChapter != null -> ChapterTransition.Prev(nextChapter, null)
-        else -> null
-    }
-
-    @Composable
-    override fun PageContent() {
-        val transition = transition ?: return
-        val goingToChapterDownloaded by produceState(false, transition) {
-            value = withContext(Dispatchers.IO) { isDownloaded(transition) }
-        }
-
-        CompositionLocalProvider(
-            LocalTextStyle provides MaterialTheme.typography.bodySmall,
-            LocalContentColor provides MaterialTheme.colorScheme.onBackground,
-        ) {
-            // The padding the holder each viewer used to inflate this into gave it.
-            val padding = if (viewer is WebGpuViewerContinuous) {
-                Modifier.padding(
-                    horizontal = STRIP_TRANSITION_SIDE_PADDING.dp,
-                    vertical = STRIP_TRANSITION_VERTICAL_PADDING.dp,
-                )
-            } else {
-                Modifier.padding(horizontal = TRANSITION_SIDE_PADDING.dp)
-            }
-            Box(modifier = padding.fillMaxWidth(), contentAlignment = Alignment.TopCenter) {
-                ChapterTransition(
-                    transition = transition,
-                    currChapterDownloaded = transition.from.pageLoader?.isLocal == true,
-                    goingToChapterDownloaded = goingToChapterDownloaded,
-                )
-            }
-        }
-    }
-
-    /** `ReaderTransitionView.bind`'s answer, which reads the disk. */
-    private suspend fun isDownloaded(transition: ChapterTransition): Boolean {
-        val manga = viewer.activity.viewModel.manga ?: return false
-        if (manga.isLocal()) return true
-        val chapter = transition.to?.chapter ?: return false
-        val source = viewer.activity.viewModel.source ?: return false
-        return viewer.downloadManager.isChapterDownloadedOnDisk(
-            chapterName = chapter.name,
-            chapterScanlator = chapter.scanlator,
-            chapterUrl = chapter.url,
-            mangaTitle = manga.title,
-            source = source,
-        )
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webgpu/WebGpuLongStripSettings.kt

@@ -1,18 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webgpu
-
-/**
- * Settings only the long strip WebGPU viewer uses.
- */
-data class WebGpuLongStripSettings(
-    val page: Page,
-    val common: WebGpuSettings,
-) {
-
-    /**
-     * What the pages are made with, so a change remakes them.
-     */
-    data class Page(
-        val continuousMinWidth: Int,
-        val continuousGap: Int,
-    )
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webgpu/WebGpuPagedSettings.kt

@@ -1,23 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webgpu
-
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
-
-/**
- * Settings only the paged WebGPU viewers use.
- */
-data class WebGpuPagedSettings(
-    val page: Page,
-    val common: WebGpuSettings,
-) {
-
-    /**
-     * What the pages are made with, so a change remakes them.
-     */
-    data class Page(
-        val dualPageView: ReaderPreferences.DualPageView,
-        val transitionAnimation: ReaderPreferences.TransitionAnimation,
-        val transitionAnimationDual: ReaderPreferences.TransitionAnimation,
-        val cutoutMode: ReaderPreferences.CutoutMode,
-        val cutoutModeDual: ReaderPreferences.CutoutMode,
-    )
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webgpu/WebGpuSettings.kt

@@ -1,10 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webgpu
-
-/**
- * Settings both WebGPU viewers use, kept in each of their own settings.
- */
-data class WebGpuSettings(
-    val doubleTapGesturesDisabled: Boolean,
-    val imageFilters: List<WebGpuShader>,
-    val tileFilters: List<WebGpuShader>,
-)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webgpu/WebGpuShaders.kt

@@ -1,113 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webgpu
-
-import android.content.Context
-import android.net.Uri
-import android.provider.OpenableColumns
-import ca.mpreg.webgpuviewer.renderer.ImageFilterWgsl
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.NonCancellable
-import kotlinx.coroutines.withContext
-import tachiyomi.core.common.preference.Preference
-import java.io.File
-import java.util.UUID
-
-/** A user's shader: [file] in [WebGpuShaders.dir], shown as [name]. */
-data class WebGpuShader(val file: String, val name: String)
-
-/** Picked shaders are copied in, so they outlive the picker's URI permission. */
-object WebGpuShaders {
-    private const val MAX_BYTES = 1 shl 20
-
-    /** What [import] names files; anything else in a preference is not ours to read or delete. */
-    private val FILE = Regex("""[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\.wgsl""")
-
-    /** Held while files and the preferences naming them change together. */
-    private val lock = Any()
-
-    private fun dir(context: Context) = File(context.filesDir, "webgpu_shaders")
-
-    fun serialize(shaders: List<WebGpuShader>): String =
-        shaders.joinToString("\n") { "${it.file}\t${it.name}" }
-
-    fun deserialize(text: String): List<WebGpuShader> = text.lineSequence()
-        .mapNotNull { line ->
-            val tab = line.indexOf('\t')
-            if (tab <= 0) return@mapNotNull null
-            val file = line.substring(0, tab)
-            if (FILE.matches(file)) WebGpuShader(file, line.substring(tab + 1)) else null
-        }
-        .distinctBy { it.file }
-        .toList()
-
-    /**
-     * Copies [uri] in and appends it to [pref]. Throws [IllegalArgumentException], with the reason, if
-     * it is not a filter this device runs.
-     */
-    suspend fun import(context: Context, uri: Uri, pref: Preference<List<WebGpuShader>>) =
-        withContext(Dispatchers.IO) {
-            val resolver = context.contentResolver
-            val name = resolver.query(uri, arrayOf(OpenableColumns.DISPLAY_NAME), null, null, null)?.use {
-                if (it.moveToFirst()) it.getString(0) else null
-            } ?: uri.lastPathSegment ?: "shader"
-            val source = resolver.openInputStream(uri)?.use { input ->
-                val buffer = ByteArray(MAX_BYTES + 1)
-                var size = 0
-                while (size < buffer.size) {
-                    val read = input.read(buffer, size, buffer.size - size)
-                    if (read < 0) break
-                    size += read
-                }
-                require(size <= MAX_BYTES) { "$name is over ${MAX_BYTES shr 20} MB" }
-                buffer.decodeToString(0, size)
-            } ?: throw IllegalArgumentException("cannot open $name")
-            ImageFilterWgsl(source, name).validate()
-
-            val shader = WebGpuShader("${UUID.randomUUID()}.wgsl", name.replace(Regex("""[\t\r\n]"""), " "))
-            // Past validation, the copy and its entry land together or not at all.
-            withContext(NonCancellable) {
-                synchronized(lock) {
-                    val file = File(dir(context).apply { mkdirs() }, shader.file)
-                    try {
-                        file.writeText(source)
-                        pref.set(pref.get() + shader)
-                    } catch (e: Exception) {
-                        file.delete()
-                        throw e
-                    }
-                }
-            }
-        }
-
-    fun remove(context: Context, pref: Preference<List<WebGpuShader>>, shader: WebGpuShader) {
-        synchronized(lock) {
-            pref.set(pref.get().filter { it.file != shader.file })
-            File(dir(context), shader.file).delete()
-        }
-    }
-
-    /**
-     * Deletes copies neither of [prefs] names, and entries whose copy is gone - left by a restored
-     * backup, or a crash between the two.
-     */
-    suspend fun prune(context: Context, prefs: List<Preference<List<WebGpuShader>>>) =
-        withContext(Dispatchers.IO) {
-            synchronized(lock) {
-                val dir = dir(context)
-                val present = dir.list()?.toSet().orEmpty()
-                val named = HashSet<String>()
-                for (pref in prefs) {
-                    val shaders = pref.get()
-                    val kept = shaders.filter { it.file in present }
-                    if (kept.size != shaders.size) pref.set(kept)
-                    kept.mapTo(named) { it.file }
-                }
-                for (file in present) {
-                    if (file !in named) File(dir, file).delete()
-                }
-            }
-        }
-
-    /** Throws if the file is gone or no longer parses. */
-    fun load(context: Context, shader: WebGpuShader): ImageFilterWgsl =
-        ImageFilterWgsl(File(dir(context), shader.file).readText(), shader.name)
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webgpu/WebGpuViewerContinuous.kt

@@ -1,111 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webgpu
-
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
-import ca.mpreg.webgpuviewer.viewer.ImagePage
-import ca.mpreg.webgpuviewer.viewer.ImageViewerContinuous
-import ca.mpreg.webgpuviewer.viewer.ImageViewerContinuousState
-import eu.kanade.tachiyomi.ui.reader.ReaderActivity
-import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import eu.kanade.tachiyomi.ui.reader.viewer.mouseWheelPaging
-import kotlinx.coroutines.launch
-import kotlin.math.max
-
-class WebGpuViewerContinuous(activity: ReaderActivity, val useGap: Boolean = false) :
-    WebGpuViewer(activity, isReversed = false, isVertical = true, viewerState = ImageViewerContinuousState()) {
-
-    override val isContinuous: Boolean get() = true
-
-    // How many pages the viewport shows depends on the zoom, and a page on screen has to be
-    // decoded rather than merely reserved - so the window follows what the last frame reached.
-    override val preloadAhead get() = max(3, state.pagesBelow)
-    override val preloadBehind get() = max(2, state.pagesAbove)
-
-    override val cacheSize get() = 2 + 2 * max(4, state.pagesAbove + state.pagesBelow)
-
-    private val state get() = viewerState as ImageViewerContinuousState
-
-    @Composable
-    override fun Content(modifier: Modifier) {
-        ImageViewerContinuous(modifier = modifier.mouseWheelPaging(this), state = state)
-    }
-
-    init {
-        state.backgroundColor = readerBackgroundColor()
-
-        state.onViewport = { readThrough ->
-            val pageChanged = readThrough !== lastReadThrough
-            if (pageChanged) {
-                lastReadThrough = readThrough
-                readThrough?.let { select(it) }
-            }
-
-            val page0 = state.getPage(0)
-            val edge = (page0 is TransitionPage && page0.prevChapter == null) ||
-                (readThrough is TransitionPage && readThrough.nextChapter == null)
-
-            val first = wasAtEdge == null
-            val edgeChanged = edge != wasAtEdge
-            wasAtEdge = edge
-            if (edge) {
-                if (edgeChanged) scope.launch { activity.showMenu() }
-            } else if (!first && (edgeChanged || pageChanged) && !activity.isScrollingThroughPages) {
-                scope.launch { activity.hideMenu() }
-            }
-        }
-    }
-
-    /** Null until the first frame, so opening mid-document neither shows nor hides. */
-    @Volatile
-    private var wasAtEdge: Boolean? = null
-
-    @Volatile
-    private var lastReadThrough: ImagePage? = null
-
-    /**
-     * Mark [imagePage] read - its bottom has cleared the viewport, which is later than
-     * onPageChange's "top arrived" and the reason this mode selects from here: scrolling up to
-     * reveal the page above would otherwise walk progress back past pages still on screen.
-     */
-    private fun select(imagePage: ImagePage) {
-        val page = readerPageFor(imagePage) ?: return
-        scope.launch { activity.onPageSelected(page) }
-    }
-
-    private fun readerPageFor(imagePage: ImagePage): ReaderPage? {
-        // Off the page itself: a transition page is never currentPage (the scroll walk stops
-        // before it), so it is the first thing a preload evicts.
-        if (imagePage is TransitionPage) return imagePage.prevChapter?.pages?.lastOrNull()
-
-        // Only an image page needs the lookup - nothing on it names its ReaderPage. Evicted
-        // means scrolled well clear of, so there is no progress left to report.
-        return (viewerPageFor(imagePage) as? ViewerReaderPage)?.page
-    }
-
-    override fun destroy() {
-        state.onViewport = null
-        lastReadThrough = null
-        wasAtEdge = null
-        super.destroy()
-    }
-
-    private fun scrollByHalfPage(direction: Int) {
-        state.animateScroll(direction * state.height / 2f)
-    }
-
-    override fun moveRight() = scrollByHalfPage(1)
-
-    override fun moveLeft() = scrollByHalfPage(-1)
-
-    override fun moveToPage(page: ReaderPage) {
-        super.moveToPage(page)
-        wasAtEdge = null
-        lastReadThrough = null
-        // Also for a jump to the page already showing, which turns nothing to slide in.
-        state.resetScroll()
-    }
-
-    override fun animateTurn(direction: Int, fromSpread: ImagePage) {
-        state.animateSlideIn(direction)
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webgpu/WebGpuViewerSettings.kt

@@ -1,366 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webgpu
-
-import android.content.ActivityNotFoundException
-import androidx.activity.compose.rememberLauncherForActivityResult
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.compose.foundation.layout.ColumnScope
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.text.selection.SelectionContainer
-import androidx.compose.foundation.verticalScroll
-import androidx.compose.material3.AlertDialog
-import androidx.compose.material3.FilterChip
-import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.key
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalConfiguration
-import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.text.font.FontFamily
-import androidx.compose.ui.text.style.TextOverflow
-import dev.icerock.moko.resources.StringResource
-import eu.kanade.domain.manga.model.readerOrientation
-import eu.kanade.domain.manga.model.readingMode
-import eu.kanade.presentation.reader.settings.TapZonesItems
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderOrientation
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderSettingsViewModel
-import eu.kanade.tachiyomi.ui.reader.setting.ReadingMode
-import kotlinx.coroutines.CancellationException
-import kotlinx.coroutines.launch
-import logcat.LogPriority
-import mihon.icons.materialsymbols.MaterialSymbols
-import mihon.icons.materialsymbols.rounded.Add
-import mihon.icons.materialsymbols.rounded.Delete
-import mihon.icons.materialsymbols.rounded.DragHandle
-import sh.calvin.reorderable.ReorderableColumn
-import tachiyomi.core.common.preference.Preference
-import tachiyomi.core.common.util.system.logcat
-import tachiyomi.i18n.MR
-import tachiyomi.presentation.core.components.CheckboxItem
-import tachiyomi.presentation.core.components.HeadingItem
-import tachiyomi.presentation.core.components.SettingsChipRow
-import tachiyomi.presentation.core.components.SettingsItemsPaddings
-import tachiyomi.presentation.core.components.SliderItem
-import tachiyomi.presentation.core.components.material.padding
-import tachiyomi.presentation.core.i18n.stringResource
-import tachiyomi.presentation.core.util.collectAsState
-import java.text.NumberFormat
-
-@Composable
-internal fun WebGpuViewerSettings(viewModel: ReaderSettingsViewModel) {
-    HeadingItem(MR.strings.pref_category_for_this_series)
-    val manga by viewModel.mangaFlow.collectAsState()
-
-    val readingMode = remember(manga) { ReadingMode.fromPreference(manga?.readingMode?.toInt()) }
-    SettingsChipRow(MR.strings.pref_category_reading_mode) {
-        ReadingMode.entries.map {
-            FilterChip(
-                selected = it == readingMode,
-                onClick = { viewModel.setReadingMode(it) },
-                label = { Text(stringResource(it.stringRes)) },
-            )
-        }
-    }
-
-    val resolved by viewModel.readingMode.collectAsState()
-    val dualPageView by viewModel.preferences.dualPageView.collectAsState()
-    if (resolved == ReadingMode.LEFT_TO_RIGHT || resolved == ReadingMode.RIGHT_TO_LEFT) {
-        SettingsChipRow(MR.strings.pref_dual_page_view) {
-            ReaderPreferences.DualPageView.entries.map {
-                FilterChip(
-                    selected = it == dualPageView,
-                    onClick = { viewModel.preferences.dualPageView.set(it) },
-                    label = { Text(stringResource(it.titleRes)) },
-                )
-            }
-        }
-    }
-
-    if (resolved == ReadingMode.WEBTOON || resolved == ReadingMode.CONTINUOUS_VERTICAL) {
-        val numberFormat = remember { NumberFormat.getPercentInstance() }
-        val continuousMinWidth by viewModel.preferences.continuousMinWidth.collectAsState()
-        SliderItem(
-            value = continuousMinWidth,
-            valueRange = ReaderPreferences.let { 1..100 },
-            label = stringResource(MR.strings.pref_continuous_minwidth),
-            valueString = numberFormat.format(continuousMinWidth / 100f),
-            onChange = {
-                viewModel.preferences.continuousMinWidth.set(it)
-            },
-            pillColor = MaterialTheme.colorScheme.surfaceContainerHighest,
-        )
-
-        if (resolved == ReadingMode.CONTINUOUS_VERTICAL) {
-            val continuousGap by viewModel.preferences.continuousGap.collectAsState()
-            SliderItem(
-                value = continuousGap,
-                valueRange = ReaderPreferences.let { 1..100 },
-                label = stringResource(MR.strings.pref_continuous_gap),
-                valueString = numberFormat.format(continuousGap / 100f),
-                onChange = {
-                    viewModel.preferences.continuousGap.set(it)
-                },
-                pillColor = MaterialTheme.colorScheme.surfaceContainerHighest,
-            )
-        }
-
-        CheckboxItem(
-            label = stringResource(MR.strings.pref_webtoon_disable_zoom_out),
-            pref = viewModel.preferences.webtoonDisableZoomOut,
-        )
-    }
-
-    val orientation = remember(manga) { ReaderOrientation.fromPreference(manga?.readerOrientation?.toInt()) }
-    SettingsChipRow(MR.strings.rotation_type) {
-        ReaderOrientation.entries.forEach {
-            FilterChip(
-                selected = it == orientation,
-                onClick = { viewModel.setOrientation(it) },
-                label = { Text(stringResource(it.stringRes)) },
-            )
-        }
-    }
-
-    HeadingItem(MR.strings.webgpu_viewer)
-
-    // As the viewer decides it, with the activity's window in place of the viewer's size. Not the sheet's own window.
-    val configuration = LocalConfiguration.current
-    val isDual = resolved.type is ReadingMode.ViewerType.Pager &&
-        when (dualPageView) {
-            ReaderPreferences.DualPageView.NEVER -> false
-            ReaderPreferences.DualPageView.ALWAYS -> true
-            ReaderPreferences.DualPageView.WIDE -> configuration.screenWidthDp > configuration.screenHeightDp
-        }
-
-    val navigationModePager by viewModel.preferences.navigationModePager.collectAsState()
-    val pagerNavInverted by viewModel.preferences.pagerNavInverted.collectAsState()
-    TapZonesItems(
-        selected = navigationModePager,
-        onSelect = viewModel.preferences.navigationModePager::set,
-        invertMode = pagerNavInverted,
-        onSelectInvertMode = viewModel.preferences.pagerNavInverted::set,
-    )
-
-    if (isDual) {
-        val transitionAnimation by viewModel.preferences.transitionAnimationDual.collectAsState()
-        SettingsChipRow(MR.strings.pref_transition_animation_dual) {
-            (
-                ReaderPreferences.TransitionAnimation.entries - ReaderPreferences.TransitionAnimation.FLIP_LEFT -
-                    ReaderPreferences.TransitionAnimation.FLIP_RIGHT
-                ).forEach {
-                FilterChip(
-                    selected = it == transitionAnimation,
-                    onClick = { viewModel.preferences.transitionAnimationDual.set(it) },
-                    label = { Text(stringResource(it.titleRes)) },
-                )
-            }
-        }
-        val cutoutMode by viewModel.preferences.cutoutModeDual.collectAsState()
-        SettingsChipRow(MR.strings.pref_cutout_mode_dual) {
-            ReaderPreferences.CutoutMode.entries.forEach {
-                FilterChip(
-                    selected = it == cutoutMode,
-                    onClick = { viewModel.preferences.cutoutModeDual.set(it) },
-                    label = { Text(stringResource(it.titleRes)) },
-                )
-            }
-        }
-        return
-    }
-
-    if (resolved != ReadingMode.WEBTOON && resolved != ReadingMode.CONTINUOUS_VERTICAL) {
-        val imageScaleType by viewModel.preferences.imageScaleType.collectAsState()
-        SettingsChipRow(MR.strings.pref_image_scale_type) {
-            ReaderPreferences.ImageScaleTypeWebGpuViewer.forEach {
-                FilterChip(
-                    selected = ReaderPreferences.ImageScaleType[imageScaleType - 1] == it,
-                    onClick = {
-                        viewModel.preferences.imageScaleType.set(ReaderPreferences.ImageScaleType.indexOf(it) + 1)
-                    },
-                    label = { Text(stringResource(it)) },
-                )
-            }
-        }
-
-        val zoomStart by viewModel.preferences.zoomStart.collectAsState()
-        SettingsChipRow(MR.strings.pref_zoom_start) {
-            ReaderPreferences.ZoomStart.mapIndexed { index, it ->
-                FilterChip(
-                    selected = zoomStart == index + 1,
-                    onClick = { viewModel.preferences.zoomStart.set(index + 1) },
-                    label = { Text(stringResource(it)) },
-                )
-            }
-        }
-
-        CheckboxItem(
-            label = stringResource(MR.strings.pref_crop_borders),
-            pref = viewModel.preferences.cropBorders,
-        )
-
-        CheckboxItem(
-            label = stringResource(MR.strings.pref_landscape_zoom),
-            pref = viewModel.preferences.landscapeZoom,
-        )
-
-        CheckboxItem(
-            label = stringResource(MR.strings.pref_navigate_pan),
-            pref = viewModel.preferences.navigateToPan,
-        )
-
-        CheckboxItem(
-            label = stringResource(MR.strings.pref_disable_double_tap_gestures),
-            pref = viewModel.preferences.disableDoubleTapGestures,
-        )
-
-        val transitionAnimation by viewModel.preferences.transitionAnimation.collectAsState()
-        SettingsChipRow(MR.strings.pref_transition_animation) {
-            ReaderPreferences.TransitionAnimation.entries.forEach {
-                FilterChip(
-                    selected = it == transitionAnimation,
-                    onClick = { viewModel.preferences.transitionAnimation.set(it) },
-                    label = { Text(stringResource(it.titleRes)) },
-                )
-            }
-        }
-
-        val cutoutMode by viewModel.preferences.cutoutMode.collectAsState()
-        SettingsChipRow(MR.strings.pref_cutout_mode) {
-            ReaderPreferences.CutoutMode.entries.forEach {
-                FilterChip(
-                    selected = it == cutoutMode,
-                    onClick = { viewModel.preferences.cutoutMode.set(it) },
-                    label = { Text(stringResource(it.titleRes)) },
-                )
-            }
-        }
-    }
-
-    val context = LocalContext.current
-    LaunchedEffect(Unit) {
-        WebGpuShaders.prune(context, listOf(viewModel.preferences.imageFilters, viewModel.preferences.tileFilters))
-    }
-    ShaderList(MR.strings.pref_image_filters, viewModel.preferences.imageFilters)
-    ShaderList(MR.strings.pref_tile_filters, viewModel.preferences.tileFilters)
-}
-
-@Composable
-private fun ShaderList(labelRes: StringResource, pref: Preference<List<WebGpuShader>>) {
-    val context = LocalContext.current
-    val scope = rememberCoroutineScope()
-    val filters by pref.collectAsState()
-    var error by remember { mutableStateOf<String?>(null) }
-
-    val pickShader = rememberLauncherForActivityResult(ActivityResultContracts.OpenDocument()) { uri ->
-        if (uri == null) return@rememberLauncherForActivityResult
-        scope.launch {
-            try {
-                WebGpuShaders.import(context, uri, pref)
-            } catch (e: CancellationException) {
-                throw e
-            } catch (e: Exception) {
-                logcat(LogPriority.WARN, e)
-                error = e.message ?: e.toString()
-            }
-        }
-    }
-
-    error?.let { message ->
-        AlertDialog(
-            onDismissRequest = { error = null },
-            confirmButton = {
-                TextButton(onClick = { error = null }) {
-                    Text(stringResource(MR.strings.action_ok))
-                }
-            },
-            title = { Text(stringResource(MR.strings.image_filter_invalid)) },
-            text = {
-                SelectionContainer(Modifier.verticalScroll(rememberScrollState())) {
-                    Text(
-                        text = message,
-                        fontFamily = FontFamily.Monospace,
-                        style = MaterialTheme.typography.bodySmall,
-                    )
-                }
-            },
-        )
-    }
-
-    HeadingItem(labelRes)
-    ReorderableColumn(
-        list = filters,
-        onSettle = { from, to ->
-            // The indices are into the list as drawn, which the preference may have moved past.
-            val moved = filters.toMutableList().apply { add(to, removeAt(from)) }
-            val current = pref.get()
-            val files = current.mapTo(HashSet()) { it.file }
-            val kept = moved.filter { it.file in files }
-            val keptFiles = kept.mapTo(HashSet()) { it.file }
-            pref.set(kept + current.filter { it.file !in keptFiles })
-        },
-    ) { _, shader, _ ->
-        key(shader.file) {
-            ReorderableItem {
-                Row(
-                    modifier = Modifier
-                        .fillMaxWidth()
-                        .padding(start = SettingsItemsPaddings.Horizontal, end = MaterialTheme.padding.small),
-                    verticalAlignment = Alignment.CenterVertically,
-                ) {
-                    Icon(
-                        imageVector = MaterialSymbols.Rounded.DragHandle,
-                        contentDescription = null,
-                        modifier = Modifier.draggableHandle(),
-                    )
-                    Text(
-                        text = shader.name,
-                        modifier = Modifier
-                            .weight(1f)
-                            .padding(horizontal = MaterialTheme.padding.medium),
-                        maxLines = 1,
-                        overflow = TextOverflow.Ellipsis,
-                    )
-                    IconButton(
-                        onClick = { WebGpuShaders.remove(context, pref, shader) },
-                    ) {
-                        Icon(
-                            imageVector = MaterialSymbols.Rounded.Delete,
-                            contentDescription = stringResource(MR.strings.action_delete),
-                        )
-                    }
-                }
-            }
-        }
-    }
-    TextButton(
-        onClick = {
-            try {
-                pickShader.launch(arrayOf("*/*"))
-            } catch (e: ActivityNotFoundException) {
-                error = e.message ?: e.toString()
-            }
-        },
-        modifier = Modifier.padding(horizontal = SettingsItemsPaddings.Horizontal - MaterialTheme.padding.small),
-    ) {
-        Icon(imageVector = MaterialSymbols.Rounded.Add, contentDescription = null)
-        Text(
-            text = stringResource(MR.strings.action_add_shader),
-            modifier = Modifier.padding(start = MaterialTheme.padding.small),
-        )
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/SimpleLongStripSettings.kt

@@ -1,25 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webtoon
-
-import eu.kanade.tachiyomi.ui.reader.viewer.DualPageSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.NavigationSettings
-
-/**
- * Settings only the webtoon viewers use.
- */
-data class SimpleLongStripSettings(
-    val page: Page,
-    val doubleTapZoom: Boolean,
-    val navigation: NavigationSettings,
-) {
-
-    /**
-     * What the pages are made with, so a change remakes them.
-     */
-    data class Page(
-        val sidePadding: Int,
-        override val dualPageSplit: Boolean,
-        override val dualPageInvert: Boolean,
-        override val dualPageRotateToFit: Boolean,
-        override val dualPageRotateToFitInvert: Boolean,
-    ) : DualPageSettings
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonAdapter.kt

@@ -5,24 +5,25 @@ import android.widget.LinearLayout
 import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
 import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
+import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
 import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView
+import eu.kanade.tachiyomi.ui.reader.viewer.calculateChapterGap
 import eu.kanade.tachiyomi.util.system.createReaderThemeContext
 
 /**
  * RecyclerView Adapter used by this [viewer] to where [ViewerChapters] updates are posted.
  */
-class WebtoonAdapter(
-    val viewer: WebtoonViewer,
-    private val webtoonItems: WebtoonItems,
-) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+class WebtoonAdapter(val viewer: WebtoonViewer) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
 
     /**
      * List of currently set items.
      */
-    val items: List<Any>
-        get() = webtoonItems.items
+    var items: List<Any> = emptyList()
+        private set
+
+    var currentChapter: ReaderChapter? = null
 
     /**
      * Context that has been wrapped to use the correct theme values based on the
@@ -35,9 +36,42 @@ class WebtoonAdapter(
      * next/previous chapter to allow seamless transitions.
      */
     fun setChapters(chapters: ViewerChapters, forceTransition: Boolean) {
-        val oldItems = items
-        webtoonItems.setChapters(chapters, forceTransition)
-        DiffUtil.calculateDiff(Callback(oldItems, items)).dispatchUpdatesTo(this)
+        val newItems = mutableListOf<Any>()
+
+        // Forces chapter transition if there is missing chapters
+        val prevHasMissingChapters = calculateChapterGap(chapters.currChapter, chapters.prevChapter) > 0
+        val nextHasMissingChapters = calculateChapterGap(chapters.nextChapter, chapters.currChapter) > 0
+
+        // Add previous chapter pages and transition.
+        chapters.prevChapter?.pages?.let(newItems::addAll)
+
+        // Skip transition page if the chapter is loaded & current page is not a transition page
+        if (prevHasMissingChapters || forceTransition || chapters.prevChapter?.state !is ReaderChapter.State.Loaded) {
+            newItems.add(ChapterTransition.Prev(chapters.currChapter, chapters.prevChapter))
+        }
+
+        // Add current chapter.
+        val currPages = chapters.currChapter.pages
+        if (currPages != null) {
+            newItems.addAll(currPages)
+        }
+
+        currentChapter = chapters.currChapter
+
+        // Add next chapter transition and pages.
+        if (nextHasMissingChapters || forceTransition || chapters.nextChapter?.state !is ReaderChapter.State.Loaded) {
+            newItems.add(ChapterTransition.Next(chapters.currChapter, chapters.nextChapter))
+        }
+
+        chapters.nextChapter?.pages?.let(newItems::addAll)
+
+        updateItems(newItems)
+    }
+
+    private fun updateItems(newItems: List<Any>) {
+        val result = DiffUtil.calculateDiff(Callback(items, newItems))
+        items = newItems
+        result.dispatchUpdatesTo(this)
     }
 
     fun refresh() {
@@ -69,7 +103,6 @@ class WebtoonAdapter(
         return when (viewType) {
             PAGE_VIEW -> {
                 val view = ReaderPageImageView(readerThemedContext, isWebtoon = true)
-                viewer.onPageViewCreated(view)
                 WebtoonPageHolder(view, viewer)
             }
             TRANSITION_VIEW -> {

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonConfig.kt

@@ -0,0 +1,120 @@
+package eu.kanade.tachiyomi.ui.reader.viewer.webtoon
+
+import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerConfig
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.DisabledNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.EdgeNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.KindlishNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.LNavigation
+import eu.kanade.tachiyomi.ui.reader.viewer.navigation.RightAndLeftNavigation
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.drop
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+
+/**
+ * Configuration used by webtoon viewers.
+ */
+class WebtoonConfig(
+    scope: CoroutineScope,
+    readerPreferences: ReaderPreferences,
+) : ViewerConfig(readerPreferences, scope) {
+
+    var themeChangedListener: (() -> Unit)? = null
+
+    var imageCropBorders = false
+        private set
+
+    var zoomOutDisabled = false
+        private set
+
+    var zoomPropertyChangedListener: ((Boolean) -> Unit)? = null
+
+    var sidePadding = 0
+        private set
+
+    var doubleTapZoom = true
+        private set
+
+    var doubleTapZoomChangedListener: ((Boolean) -> Unit)? = null
+
+    val theme = readerPreferences.readerTheme.get()
+
+    init {
+        readerPreferences.cropBordersWebtoon
+            .register({ imageCropBorders = it }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.webtoonSidePadding
+            .register({ sidePadding = it }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.navigationModeWebtoon
+            .register({ navigationMode = it }, { updateNavigation(it) })
+
+        readerPreferences.webtoonNavInverted
+            .register({ tappingInverted = it }, { navigator.invertMode = it })
+        readerPreferences.webtoonNavInverted.changes()
+            .drop(1)
+            .onEach { navigationModeChangedListener?.invoke() }
+            .launchIn(scope)
+
+        readerPreferences.dualPageSplitWebtoon
+            .register({ dualPageSplit = it }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.dualPageInvertWebtoon
+            .register({ dualPageInvert = it }, { imagePropertyChangedListener?.invoke() })
+
+        readerPreferences.dualPageRotateToFitWebtoon
+            .register(
+                { dualPageRotateToFit = it },
+                { imagePropertyChangedListener?.invoke() },
+            )
+
+        readerPreferences.dualPageRotateToFitInvertWebtoon
+            .register(
+                { dualPageRotateToFitInvert = it },
+                { imagePropertyChangedListener?.invoke() },
+            )
+
+        readerPreferences.webtoonDisableZoomOut
+            .register(
+                { zoomOutDisabled = it },
+                { zoomPropertyChangedListener?.invoke(it) },
+            )
+
+        readerPreferences.webtoonDoubleTapZoomEnabled
+            .register(
+                { doubleTapZoom = it },
+                { doubleTapZoomChangedListener?.invoke(it) },
+            )
+
+        readerPreferences.readerTheme.changes()
+            .drop(1)
+            .distinctUntilChanged()
+            .onEach { themeChangedListener?.invoke() }
+            .launchIn(scope)
+    }
+
+    override var navigator: ViewerNavigation = defaultNavigation()
+        set(value) {
+            field = value.also { it.invertMode = tappingInverted }
+        }
+
+    override fun defaultNavigation(): ViewerNavigation {
+        return LNavigation()
+    }
+
+    override fun updateNavigation(navigationMode: Int) {
+        this.navigator = when (navigationMode) {
+            0 -> defaultNavigation()
+            1 -> LNavigation()
+            2 -> KindlishNavigation()
+            3 -> EdgeNavigation()
+            4 -> RightAndLeftNavigation()
+            5 -> DisabledNavigation()
+            else -> defaultNavigation()
+        }
+        navigationModeChangedListener?.invoke()
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonItems.kt

@@ -1,32 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webtoon
-
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.setValue
-import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
-import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
-import eu.kanade.tachiyomi.ui.reader.viewer.viewerItems
-
-/**
- * Items of a webtoon viewer, where [ViewerChapters] updates are posted.
- */
-class WebtoonItems {
-
-    /**
-     * List of currently set items.
-     */
-    var items: List<Any> by mutableStateOf(emptyList())
-        private set
-
-    var currentChapter: ReaderChapter? = null
-        private set
-
-    /**
-     * Updates the items with the given [chapters]. It handles setting a few pages of the
-     * next/previous chapter to allow seamless transitions.
-     */
-    fun setChapters(chapters: ViewerChapters, forceTransition: Boolean) {
-        currentChapter = chapters.currChapter
-        items = viewerItems(chapters, forceTransition)
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonPageHolder.kt

@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.webtoon
 
+import android.view.LayoutInflater
 import android.view.ViewGroup
 import android.view.ViewGroup.LayoutParams.MATCH_PARENT
 import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
@@ -8,12 +9,13 @@ import androidx.core.view.isVisible
 import androidx.core.view.updateLayoutParams
 import androidx.core.view.updateMargins
 import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
+import eu.kanade.presentation.util.formattedMessage
+import eu.kanade.tachiyomi.databinding.ReaderErrorBinding
 import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageErrorView
 import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView
 import eu.kanade.tachiyomi.ui.reader.viewer.ReaderProgressIndicator
-import eu.kanade.tachiyomi.ui.reader.viewer.processStripImage
+import eu.kanade.tachiyomi.ui.webview.WebViewActivity
 import eu.kanade.tachiyomi.util.system.dpToPx
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
@@ -24,8 +26,11 @@ import kotlinx.coroutines.supervisorScope
 import kotlinx.coroutines.withContext
 import logcat.LogPriority
 import okio.Buffer
+import okio.BufferedSource
+import tachiyomi.core.common.i18n.stringResource
 import tachiyomi.core.common.util.system.ImageUtil
 import tachiyomi.core.common.util.system.logcat
+import tachiyomi.i18n.MR
 
 /**
  * Holder of the webtoon reader for a single page of a chapter.
@@ -53,7 +58,7 @@ class WebtoonPageHolder(
     /**
      * Error layout to show when the image fails to load.
      */
-    private var errorLayout: ReaderPageErrorView? = null
+    private var errorLayout: ReaderErrorBinding? = null
 
     /**
      * Getter to retrieve the height of the recycler view.
@@ -86,7 +91,6 @@ class WebtoonPageHolder(
      */
     fun bind(page: ReaderPage) {
         this.page = page
-        frame.pageColorFilter = viewer.pageColorFilter
         loadJob?.cancel()
         loadJob = scope.launch { loadPageAndProcessStatus() }
         refreshLayoutParams()
@@ -186,7 +190,7 @@ class WebtoonPageHolder(
             val buffer = withContext(Dispatchers.IO) { streamFn().use { Buffer().readFrom(it) } }
             // Splitting and merging decode the image, which is CPU work
             val (source, isAnimated) = withContext(Dispatchers.Default) {
-                val source = viewer.simpleLongStrip.page.processStripImage(buffer)
+                val source = process(buffer)
                 val isAnimated = ImageUtil.isAnimatedAndSupported(source)
                 Pair(source, isAnimated)
             }
@@ -195,9 +199,9 @@ class WebtoonPageHolder(
                     source,
                     isAnimated,
                     ReaderPageImageView.Config(
-                        zoomDuration = viewer.general.doubleTapAnimDuration,
+                        zoomDuration = viewer.config.doubleTapAnimDuration,
                         minimumScaleType = SubsamplingScaleImageView.SCALE_TYPE_FIT_WIDTH,
-                        cropBorders = viewer.longStrip.cropBorders,
+                        cropBorders = viewer.config.imageCropBorders,
                     ),
                 )
                 removeErrorLayout()
@@ -210,6 +214,32 @@ class WebtoonPageHolder(
         }
     }
 
+    private fun process(imageSource: BufferedSource): BufferedSource {
+        if (viewer.config.dualPageRotateToFit) {
+            return rotateDualPage(imageSource)
+        }
+
+        if (viewer.config.dualPageSplit) {
+            val isDoublePage = ImageUtil.isWideImage(imageSource)
+            if (isDoublePage) {
+                val upperSide = if (viewer.config.dualPageInvert) ImageUtil.Side.LEFT else ImageUtil.Side.RIGHT
+                return ImageUtil.splitAndMerge(imageSource, upperSide)
+            }
+        }
+
+        return imageSource
+    }
+
+    private fun rotateDualPage(imageSource: BufferedSource): BufferedSource {
+        val isDoublePage = ImageUtil.isWideImage(imageSource)
+        return if (isDoublePage) {
+            val rotation = if (viewer.config.dualPageRotateToFitInvert) -90f else 90f
+            ImageUtil.rotateImage(imageSource, rotation)
+        } else {
+            imageSource
+        }
+    }
+
     /**
      * Called when the page has an error.
      */
@@ -243,15 +273,34 @@ class WebtoonPageHolder(
     }
 
     /**
-     * Shows the error of the page.
+     * Initializes a button to retry pages.
      */
-    private fun initErrorLayout(error: Throwable?) {
-        val page = page ?: return
-        val errorLayout = errorLayout ?: ReaderPageErrorView(context).also {
-            frame.addView(it, FrameLayout.LayoutParams(MATCH_PARENT, (parentHeight * 0.8).toInt()))
-            errorLayout = it
+    private fun initErrorLayout(error: Throwable?): ReaderErrorBinding {
+        if (errorLayout == null) {
+            errorLayout = ReaderErrorBinding.inflate(LayoutInflater.from(context), frame, true)
+            errorLayout?.root?.layoutParams = FrameLayout.LayoutParams(MATCH_PARENT, (parentHeight * 0.8).toInt())
+            errorLayout?.actionRetry?.setOnClickListener {
+                page?.let { it.chapter.pageLoader?.retryPage(it) }
+            }
         }
-        errorLayout.bind(page = page, error = error, sourceId = viewer.activity.viewModel.manga?.source)
+
+        val imageUrl = page?.imageUrl
+        errorLayout?.actionOpenInWebView?.isVisible = imageUrl != null
+        if (imageUrl != null) {
+            if (imageUrl.startsWith("http", true)) {
+                errorLayout?.actionOpenInWebView?.setOnClickListener {
+                    val sourceId = viewer.activity.viewModel.manga?.source
+
+                    val intent = WebViewActivity.newIntent(context, imageUrl, sourceId)
+                    context.startActivity(intent)
+                }
+            }
+        }
+
+        errorLayout?.errorMessage?.text = with(context) { error?.formattedMessage }
+            ?: context.stringResource(MR.strings.decode_image_error)
+
+        return errorLayout!!
     }
 
     /**
@@ -259,7 +308,7 @@ class WebtoonPageHolder(
      */
     private fun removeErrorLayout() {
         errorLayout?.let {
-            frame.removeView(it)
+            frame.removeView(it.root)
             errorLayout = null
         }
     }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonPageTracker.kt

@@ -1,121 +0,0 @@
-package eu.kanade.tachiyomi.ui.reader.viewer.webtoon
-
-import eu.kanade.tachiyomi.ui.reader.ReaderActivity
-import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
-import tachiyomi.core.common.util.system.logcat
-import kotlin.math.abs
-
-/**
- * The item a webtoon viewer of [items] is on, shared by the view and Compose viewers. It tells [activity] of each new
- * page and preloads the chapters around it. A scroll further than [hideThreshold] hides the menu.
- */
-class WebtoonPageTracker(
-    private val activity: ReaderActivity,
-    private val items: WebtoonItems,
-    private val hideThreshold: Int,
-) {
-
-    /**
-     * Currently active item. It can be a chapter page or a chapter transition.
-     */
-    var currentPage: Any? = null
-        private set
-
-    /**
-     * Marks the item at [position], the last one whose end is visible, as active.
-     */
-    fun onScrolled(position: Int) {
-        val item = items.items.getOrNull(position)
-        val allowPreload = checkAllowPreload(item as? ReaderPage)
-        if (item != null && currentPage != item) {
-            currentPage = item
-            when (item) {
-                is ReaderPage -> onPageSelected(item, allowPreload)
-                is ChapterTransition -> onTransitionSelected(item)
-            }
-        }
-    }
-
-    /**
-     * Called when the list scrolled by [dy] pixels, leaving the items from [firstVisible] to [lastEndVisible] on
-     * screen.
-     */
-    fun onScrolledBy(dy: Float, firstVisible: Int, lastEndVisible: Int) {
-        if (abs(dy) > hideThreshold && activity.viewModel.state.value.menuVisible) {
-            activity.hideMenu()
-        }
-
-        if (dy < 0) {
-            val firstItem = items.items.getOrNull(firstVisible)
-            if (firstItem is ChapterTransition.Prev && firstItem.to != null) {
-                activity.requestPreloadChapter(firstItem.to)
-            }
-        }
-
-        val lastItem = items.items.getOrNull(lastEndVisible)
-        if (lastItem is ChapterTransition.Next && lastItem.to == null) {
-            activity.showMenu()
-        }
-    }
-
-    private fun checkAllowPreload(page: ReaderPage?): Boolean {
-        // Page is transition page - preload allowed
-        page ?: return true
-
-        // Initial opening - preload allowed
-        currentPage ?: return true
-
-        // Allow preload for
-        // 1. Going between pages of same chapter
-        // 2. Next chapter page
-        return when (page.chapter) {
-            (currentPage as? ReaderPage)?.chapter -> true
-            lastChapter() -> true
-            else -> false
-        }
-    }
-
-    /**
-     * Called when a [page] is marked as active. It notifies the activity of the change and requests the preload of
-     * the next chapter if this is the last page.
-     */
-    private fun onPageSelected(page: ReaderPage, allowPreload: Boolean) {
-        val pages = page.chapter.pages ?: return
-        logcat { "onPageSelected: ${page.number}/${pages.size}" }
-        activity.onPageSelected(page)
-
-        // Preload next chapter once we're within the last 5 pages of the current chapter
-        val inPreloadRange = pages.size - page.number < 5
-        if (inPreloadRange && allowPreload && page.chapter == items.currentChapter) {
-            logcat { "Request preload next chapter because we're at page ${page.number} of ${pages.size}" }
-            val transitionChapter = lastChapter()
-            if (transitionChapter != null) {
-                logcat { "Requesting to preload chapter ${transitionChapter.chapter.chapterNumber}" }
-                activity.requestPreloadChapter(transitionChapter)
-            }
-        }
-    }
-
-    /**
-     * Called when a [transition] is marked as active. It request the preload of the destination chapter of the
-     * transition.
-     */
-    private fun onTransitionSelected(transition: ChapterTransition) {
-        logcat { "onTransitionSelected: $transition" }
-        val toChapter = transition.to
-        if (toChapter != null) {
-            logcat { "Request preload destination chapter because we're on the transition" }
-            activity.requestPreloadChapter(toChapter)
-        }
-    }
-
-    /**
-     * The chapter at the end of the list: the next transition's, or that of the next chapter's pages.
-     */
-    private fun lastChapter() = when (val lastItem = items.items.lastOrNull()) {
-        is ChapterTransition.Next -> lastItem.to
-        is ReaderPage -> lastItem.chapter
-        else -> null
-    }
-}

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonStripImageView.kt

@@ -3,7 +3,6 @@ package eu.kanade.tachiyomi.ui.reader.viewer.webtoon
 import android.content.Context
 import android.graphics.Bitmap
 import android.graphics.Canvas
-import android.graphics.ColorFilter
 import android.graphics.Paint
 import android.graphics.Rect
 import android.view.MotionEvent
@@ -23,14 +22,6 @@ class WebtoonStripImageView(context: Context) : View(context) {
     private var imageHeight = 0
 
     private val paint = Paint(Paint.FILTER_BITMAP_FLAG)
-
-    /** Applied to the strips as they draw. */
-    var colorFilter: ColorFilter?
-        get() = paint.colorFilter
-        set(value) {
-            paint.colorFilter = value
-            invalidate()
-        }
     private val clipRect = Rect()
     private val dstRect = Rect()
 

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonTransitionHolder.kt

@@ -4,12 +4,21 @@ import android.view.Gravity
 import android.view.ViewGroup.LayoutParams.MATCH_PARENT
 import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
 import android.widget.LinearLayout
-import androidx.compose.foundation.layout.PaddingValues
-import androidx.compose.ui.unit.dp
+import androidx.appcompat.widget.AppCompatButton
+import androidx.appcompat.widget.AppCompatTextView
+import androidx.core.view.isNotEmpty
+import androidx.core.view.isVisible
+import com.google.android.material.progressindicator.CircularProgressIndicator
 import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
+import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
 import eu.kanade.tachiyomi.ui.reader.viewer.ReaderTransitionView
-import eu.kanade.tachiyomi.ui.reader.viewer.transitionDownloadState
 import eu.kanade.tachiyomi.util.system.dpToPx
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
+import tachiyomi.core.common.i18n.stringResource
+import tachiyomi.i18n.MR
 
 /**
  * Holder of the webtoon viewer that contains a chapter transition.
@@ -19,8 +28,20 @@ class WebtoonTransitionHolder(
     viewer: WebtoonViewer,
 ) : WebtoonBaseHolder(layout, viewer) {
 
+    private val scope = MainScope()
+    private var stateJob: Job? = null
+
     private val transitionView = ReaderTransitionView(context)
 
+    /**
+     * View container of the current status of the transition page. Child views will be added
+     * dynamically.
+     */
+    private var pagesContainer = LinearLayout(context).apply {
+        orientation = LinearLayout.VERTICAL
+        gravity = Gravity.CENTER
+    }
+
     init {
         layout.layoutParams = LinearLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT)
         layout.orientation = LinearLayout.VERTICAL
@@ -30,22 +51,95 @@ class WebtoonTransitionHolder(
         val paddingHorizontal = 32.dpToPx
         layout.setPadding(paddingHorizontal, paddingVertical, paddingHorizontal, paddingVertical)
 
+        val childMargins = 16.dpToPx
+        val childParams = LinearLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT).apply {
+            setMargins(0, childMargins, 0, childMargins)
+        }
+
         layout.addView(transitionView)
+        layout.addView(pagesContainer, childParams)
     }
 
     /**
-     * Binds the given [transition] with this view holder.
+     * Binds the given [transition] with this view holder, subscribing to its state.
      */
     fun bind(transition: ChapterTransition) {
         transitionView.bind(
-            transition = transition,
-            downloadState = viewer.downloadManager.transitionDownloadState(
-                transition,
-                viewer.activity.viewModel.manga,
-                viewer.activity.viewModel.source,
-            ),
-            onRetry = viewer.activity::requestPreloadChapter,
-            statusPadding = PaddingValues(vertical = 16.dp),
+            transition,
+            viewer.downloadManager,
+            viewer.activity.viewModel.manga,
+            viewer.activity.viewModel.source,
         )
+
+        transition.to?.let { observeStatus(it, transition) }
+    }
+
+    /**
+     * Called when the view is recycled and being added to the view pool.
+     */
+    override fun recycle() {
+        stateJob?.cancel()
+    }
+
+    /**
+     * Observes the status of the page list of the next/previous chapter. Whenever there's a new
+     * state, the pages container is cleaned up before setting the new state.
+     */
+    private fun observeStatus(chapter: ReaderChapter, transition: ChapterTransition) {
+        stateJob?.cancel()
+        stateJob = scope.launch {
+            chapter.stateFlow
+                .collectLatest { state ->
+                    pagesContainer.removeAllViews()
+                    when (state) {
+                        is ReaderChapter.State.Loading -> setLoading()
+                        is ReaderChapter.State.Error -> setError(state.error, transition)
+                        is ReaderChapter.State.Wait, is ReaderChapter.State.Loaded -> {
+                            // No additional view is added
+                        }
+                    }
+                    pagesContainer.isVisible = pagesContainer.isNotEmpty()
+                }
+        }
+    }
+
+    /**
+     * Sets the loading state on the pages container.
+     */
+    private fun setLoading() {
+        val progress = CircularProgressIndicator(context)
+        progress.isIndeterminate = true
+
+        val textView = AppCompatTextView(context).apply {
+            wrapContent()
+            text = context.stringResource(MR.strings.transition_pages_loading)
+        }
+
+        pagesContainer.addView(progress)
+        pagesContainer.addView(textView)
+    }
+
+    /**
+     * Sets the error state on the pages container.
+     */
+    private fun setError(error: Throwable, transition: ChapterTransition) {
+        val textView = AppCompatTextView(context).apply {
+            wrapContent()
+            text = context.stringResource(MR.strings.transition_pages_error, error.message ?: "")
+        }
+
+        val retryBtn = AppCompatButton(context).apply {
+            wrapContent()
+            text = context.stringResource(MR.strings.action_retry)
+            setOnClickListener {
+                val toChapter = transition.to
+                if (toChapter != null) {
+                    viewer.activity.requestPreloadChapter(toChapter)
+                }
+            }
+        }
+
+        pagesContainer.addView(textView)
+        pagesContainer.addView(retryBtn)
     }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonViewer.kt

@@ -1,15 +1,11 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.webtoon
 
-import android.graphics.ColorFilter
+import android.graphics.PointF
+import android.view.KeyEvent
+import android.view.MotionEvent
+import android.view.View
 import android.view.ViewGroup
 import android.view.ViewGroup.LayoutParams.MATCH_PARENT
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.SideEffect
-import androidx.compose.runtime.remember
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.graphics.asAndroidColorFilter
-import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.app.ActivityCompat
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
@@ -19,18 +15,12 @@ import eu.kanade.tachiyomi.ui.reader.ReaderActivity
 import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.model.ViewerChapters
-import eu.kanade.tachiyomi.ui.reader.setting.GeneralSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.LocalPageColorFilter
-import eu.kanade.tachiyomi.ui.reader.viewer.LongStripSettings
-import eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView
 import eu.kanade.tachiyomi.ui.reader.viewer.Viewer
-import eu.kanade.tachiyomi.ui.reader.viewer.collectChanges
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation.NavigationRegion
 import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.cancel
 import mihon.app.di.appGraph
 import tachiyomi.core.common.util.system.logcat
-import java.util.Collections
-import java.util.WeakHashMap
 import kotlin.math.max
 import kotlin.math.min
 
@@ -65,41 +55,25 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
      */
     private val layoutManager = WebtoonLayoutManager(activity, scrollDistance)
 
-    private val settingsViewModel = activity.settingsViewModel
-
     /**
-     * Settings every long strip viewer uses, like crop image borders.
+     * Configuration used by this viewer, like allow taps, or crop image borders.
      */
-    val longStrip: LongStripSettings
-        get() = settingsViewModel.longStrip.value
-
-    /**
-     * Settings only the webtoon viewers use, like side padding or tap zones.
-     */
-    val simpleLongStrip: SimpleLongStripSettings
-        get() = settingsViewModel.simpleLongStrip.value
-
-    /**
-     * Settings shared by every viewer, like allow taps or page transitions.
-     */
-    val general: GeneralSettings
-        get() = settingsViewModel.general.value
-
-    private val webtoonItems = WebtoonItems()
+    val config = WebtoonConfig(scope, readerPreferences)
 
     /**
      * Adapter of the recycler view.
      */
-    private val adapter = WebtoonAdapter(this, webtoonItems)
+    private val adapter = WebtoonAdapter(this)
 
-    private val tracker = WebtoonPageTracker(
-        activity,
-        webtoonItems,
-        readerPreferences.readerHideThreshold.get().threshold,
-    )
+    /**
+     * Currently active item. It can be a chapter page or a chapter transition.
+     */
+    private var currentPage: Any? = null
+
+    private val threshold: Int by lazy { readerPreferences.readerHideThreshold.get().threshold }
 
     init {
-        recycler.sidePaddingPercent = simpleLongStrip.page.sidePadding
+        recycler.sidePaddingPercent = config.sidePadding
         recycler.setItemViewCacheSize(RECYCLER_VIEW_CACHE_SIZE)
         recycler.isVisible = false // Don't let the recycler layout yet
         recycler.layoutParams = ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT)
@@ -111,11 +85,24 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
             object : RecyclerView.OnScrollListener() {
                 override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                     onScrolled()
-                    tracker.onScrolledBy(
-                        dy = dy.toFloat(),
-                        firstVisible = layoutManager.findFirstVisibleItemPosition(),
-                        lastEndVisible = layoutManager.findLastEndVisibleItemPosition(),
-                    )
+
+                    if ((dy > threshold || dy < -threshold) && activity.viewModel.state.value.menuVisible) {
+                        activity.hideMenu()
+                    }
+
+                    if (dy < 0) {
+                        val firstIndex = layoutManager.findFirstVisibleItemPosition()
+                        val firstItem = adapter.items.getOrNull(firstIndex)
+                        if (firstItem is ChapterTransition.Prev && firstItem.to != null) {
+                            activity.requestPreloadChapter(firstItem.to)
+                        }
+                    }
+
+                    val lastIndex = layoutManager.findLastEndVisibleItemPosition()
+                    val lastItem = adapter.items.getOrNull(lastIndex)
+                    if (lastItem is ChapterTransition.Next && lastItem.to == null) {
+                        activity.showMenu()
+                    }
                 }
             },
         )
@@ -124,14 +111,18 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
             recycler.getLocationOnScreen(viewPosition)
             val viewPositionRelativeToWindow = IntArray(2)
             recycler.getLocationInWindow(viewPositionRelativeToWindow)
-            val pos = Offset(
+            val pos = PointF(
                 (event.rawX - viewPosition[0] + viewPositionRelativeToWindow[0]) / recycler.width,
                 (event.rawY - viewPosition[1] + viewPositionRelativeToWindow[1]) / recycler.originalHeight,
             )
-            activity.onViewerTap(pos)
+            when (config.navigator.getAction(pos)) {
+                NavigationRegion.MENU -> activity.toggleMenu()
+                NavigationRegion.NEXT, NavigationRegion.RIGHT -> scrollDown()
+                NavigationRegion.PREV, NavigationRegion.LEFT -> scrollUp()
+            }
         }
         recycler.longTapListener = f@{ event ->
-            if (activity.viewModel.state.value.menuVisible || general.longTapEnabled) {
+            if (activity.viewModel.state.value.menuVisible || config.longTapEnabled) {
                 val child = recycler.findChildViewUnder(event.x, event.y)
                 if (child != null) {
                     val position = recycler.getChildAdapterPosition(child)
@@ -145,54 +136,57 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
             false
         }
 
-        settingsViewModel.general.collectChanges(scope) { old, new ->
-            if (old != null && old.theme != new.theme) {
-                ActivityCompat.recreate(activity)
-            }
+        config.imagePropertyChangedListener = {
+            recycler.sidePaddingPercent = config.sidePadding
+            refreshAdapter()
         }
-        settingsViewModel.longStrip.collectChanges(scope) { old, new ->
-            if (old != null && old.cropBorders != new.cropBorders) {
-                refreshAdapter()
-            }
-            if (old?.zoomOutDisabled != new.zoomOutDisabled) {
-                frame.zoomOutDisabled = new.zoomOutDisabled
-            }
+
+        config.themeChangedListener = {
+            ActivityCompat.recreate(activity)
         }
-        settingsViewModel.simpleLongStrip.collectChanges(scope) { old, new ->
-            if (old != null && old.page != new.page) {
-                recycler.sidePaddingPercent = new.page.sidePadding
-                refreshAdapter()
-            }
-            if (old?.doubleTapZoom != new.doubleTapZoom) {
-                frame.doubleTapZoom = new.doubleTapZoom
-            }
+
+        config.doubleTapZoomChangedListener = {
+            frame.doubleTapZoom = it
+        }
+
+        config.zoomPropertyChangedListener = {
+            frame.zoomOutDisabled = it
+        }
+
+        config.navigationModeChangedListener = {
+            val showOnStart = config.navigationOverlayOnStart || config.forceNavigationOverlay
+            activity.binding.navigationOverlay.setNavigation(config.navigator, showOnStart)
         }
 
         frame.layoutParams = ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT)
-        frame.descendantFocusability = ViewGroup.FOCUS_BLOCK_DESCENDANTS
         frame.addView(recycler)
     }
 
-    /** The page images' colours, for pages bound later - see [LocalPageColorFilter]. */
-    var pageColorFilter: ColorFilter? = null
-        private set
+    private fun checkAllowPreload(page: ReaderPage?): Boolean {
+        // Page is transition page - preload allowed
+        page ?: return true
 
-    /** Every page view made, as the recycler's cached ones are neither children nor always bound again. */
-    private val pageViews = Collections.newSetFromMap(WeakHashMap<ReaderPageImageView, Boolean>())
+        // Initial opening - preload allowed
+        currentPage ?: return true
 
-    fun onPageViewCreated(view: ReaderPageImageView) {
-        pageViews += view
+        val nextItem = adapter.items.getOrNull(adapter.items.size - 1)
+        val nextChapter = (nextItem as? ChapterTransition.Next)?.to ?: (nextItem as? ReaderPage)?.chapter
+
+        // Allow preload for
+        // 1. Going between pages of same chapter
+        // 2. Next chapter page
+        return when (page.chapter) {
+            (currentPage as? ReaderPage)?.chapter -> true
+            nextChapter -> true
+            else -> false
+        }
     }
 
-    @Composable
-    override fun Content(modifier: Modifier) {
-        val filter = LocalPageColorFilter.current
-        val pageFilter = remember(filter) { filter?.asAndroidColorFilter() }
-        SideEffect {
-            pageColorFilter = pageFilter
-            pageViews.forEach { it.pageColorFilter = pageFilter }
-        }
-        AndroidView(factory = { frame }, modifier = modifier)
+    /**
+     * Returns the view this viewer uses.
+     */
+    override fun getView(): View {
+        return frame
     }
 
     /**
@@ -203,11 +197,46 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
         scope.cancel()
     }
 
+    /**
+     * Called from the RecyclerView listener when a [page] is marked as active. It notifies the
+     * activity of the change and requests the preload of the next chapter if this is the last page.
+     */
+    private fun onPageSelected(page: ReaderPage, allowPreload: Boolean) {
+        val pages = page.chapter.pages ?: return
+        logcat { "onPageSelected: ${page.number}/${pages.size}" }
+        activity.onPageSelected(page)
+
+        // Preload next chapter once we're within the last 5 pages of the current chapter
+        val inPreloadRange = pages.size - page.number < 5
+        if (inPreloadRange && allowPreload && page.chapter == adapter.currentChapter) {
+            logcat { "Request preload next chapter because we're at page ${page.number} of ${pages.size}" }
+            val nextItem = adapter.items.getOrNull(adapter.items.size - 1)
+            val transitionChapter = (nextItem as? ChapterTransition.Next)?.to ?: (nextItem as?ReaderPage)?.chapter
+            if (transitionChapter != null) {
+                logcat { "Requesting to preload chapter ${transitionChapter.chapter.chapterNumber}" }
+                activity.requestPreloadChapter(transitionChapter)
+            }
+        }
+    }
+
+    /**
+     * Called from the RecyclerView listener when a [transition] is marked as active. It request the
+     * preload of the destination chapter of the transition.
+     */
+    private fun onTransitionSelected(transition: ChapterTransition) {
+        logcat { "onTransitionSelected: $transition" }
+        val toChapter = transition.to
+        if (toChapter != null) {
+            logcat { "Request preload destination chapter because we're on the transition" }
+            activity.requestPreloadChapter(toChapter)
+        }
+    }
+
     /**
      * Tells this viewer to set the given [chapters] as active.
      */
     override fun setChapters(chapters: ViewerChapters) {
-        val forceTransition = general.alwaysShowChapterTransition || tracker.currentPage is ChapterTransition
+        val forceTransition = config.alwaysShowChapterTransition || currentPage is ChapterTransition
         adapter.setChapters(chapters, forceTransition)
 
         if (recycler.isGone) {
@@ -233,15 +262,24 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
         }
     }
 
-    private fun onScrolled(pos: Int? = null) {
-        tracker.onScrolled(pos ?: layoutManager.findLastEndVisibleItemPosition())
+    fun onScrolled(pos: Int? = null) {
+        val position = pos ?: layoutManager.findLastEndVisibleItemPosition()
+        val item = adapter.items.getOrNull(position)
+        val allowPreload = checkAllowPreload(item as? ReaderPage)
+        if (item != null && currentPage != item) {
+            currentPage = item
+            when (item) {
+                is ReaderPage -> onPageSelected(item, allowPreload)
+                is ChapterTransition -> onTransitionSelected(item)
+            }
+        }
     }
 
     /**
      * Scrolls up by [scrollDistance].
      */
-    override fun moveBackward() {
-        if (general.usePageTransitions) {
+    private fun scrollUp() {
+        if (config.usePageTransitions) {
             recycler.smoothScrollBy(0, -scrollDistance)
         } else {
             recycler.scrollBy(0, -scrollDistance)
@@ -251,14 +289,60 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
     /**
      * Scrolls down by [scrollDistance].
      */
-    override fun moveForward() {
-        if (general.usePageTransitions) {
+    private fun scrollDown() {
+        if (config.usePageTransitions) {
             recycler.smoothScrollBy(0, scrollDistance)
         } else {
             recycler.scrollBy(0, scrollDistance)
         }
     }
 
+    /**
+     * Called from the containing activity when a key [event] is received. It should return true
+     * if the event was handled, false otherwise.
+     */
+    override fun handleKeyEvent(event: KeyEvent): Boolean {
+        val isUp = event.action == KeyEvent.ACTION_UP
+
+        when (event.keyCode) {
+            KeyEvent.KEYCODE_VOLUME_DOWN -> {
+                if (!config.volumeKeysEnabled || activity.viewModel.state.value.menuVisible) {
+                    return false
+                } else if (isUp) {
+                    if (!config.volumeKeysInverted) scrollDown() else scrollUp()
+                }
+            }
+            KeyEvent.KEYCODE_VOLUME_UP -> {
+                if (!config.volumeKeysEnabled || activity.viewModel.state.value.menuVisible) {
+                    return false
+                } else if (isUp) {
+                    if (!config.volumeKeysInverted) scrollUp() else scrollDown()
+                }
+            }
+            KeyEvent.KEYCODE_MENU -> if (isUp) activity.toggleMenu()
+
+            KeyEvent.KEYCODE_DPAD_LEFT,
+            KeyEvent.KEYCODE_DPAD_UP,
+            KeyEvent.KEYCODE_PAGE_UP,
+            -> if (isUp) scrollUp()
+
+            KeyEvent.KEYCODE_DPAD_RIGHT,
+            KeyEvent.KEYCODE_DPAD_DOWN,
+            KeyEvent.KEYCODE_PAGE_DOWN,
+            -> if (isUp) scrollDown()
+            else -> return false
+        }
+        return true
+    }
+
+    /**
+     * Called from the containing activity when a generic motion [event] is received. It should
+     * return true if the event was handled, false otherwise.
+     */
+    override fun handleGenericMotionEvent(event: MotionEvent): Boolean {
+        return false
+    }
+
     /**
      * Notifies adapter of changes around the current page to trigger a relayout in the recycler.
      * Used when an image configuration is changed.

app/src/main/java/eu/kanade/tachiyomi/util/lang/RectFExtensions.kt

@@ -0,0 +1,15 @@
+package eu.kanade.tachiyomi.util.lang
+
+import android.graphics.RectF
+import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
+
+fun RectF.invert(invertMode: ReaderPreferences.TappingInvertMode): RectF {
+    val horizontal = invertMode.shouldInvertHorizontal
+    val vertical = invertMode.shouldInvertVertical
+    return when {
+        horizontal && vertical -> RectF(1f - this.right, 1f - this.bottom, 1f - this.left, 1f - this.top)
+        vertical -> RectF(this.left, 1f - this.bottom, this.right, 1f - this.top)
+        horizontal -> RectF(1f - this.right, this.top, 1f - this.left, this.bottom)
+        else -> this
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/util/system/ContextExtensions.kt

@@ -18,7 +18,6 @@ import com.hippo.unifile.UniFile
 import eu.kanade.domain.ui.model.ThemeMode
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.ui.base.delegate.ThemingDelegate
-import eu.kanade.tachiyomi.ui.reader.setting.ReaderPreferences
 import eu.kanade.tachiyomi.util.lang.truncateCenter
 import logcat.LogPriority
 import mihon.app.di.appGraph
@@ -101,15 +100,15 @@ fun Context.createFileInCacheDir(name: String): File {
 private val ReaderGrayBackgroundColor = Color.rgb(0x20, 0x21, 0x25)
 
 /**
- * Background color of the reader for the given [readerTheme].
+ * Background color of the reader for the given [readerTheme] preference value.
  *
- * Automatic resolves against the current night mode, matching the activity background.
+ * Automatic (3) resolves against the current night mode, matching the activity background.
  */
-fun Context.readerBackgroundColor(readerTheme: ReaderPreferences.ReaderTheme): Int = when (readerTheme) {
-    ReaderPreferences.ReaderTheme.WHITE -> Color.WHITE
-    ReaderPreferences.ReaderTheme.BLACK -> Color.BLACK
-    ReaderPreferences.ReaderTheme.GRAY -> ReaderGrayBackgroundColor
-    ReaderPreferences.ReaderTheme.AUTOMATIC -> if (isNightMode()) ReaderGrayBackgroundColor else Color.WHITE
+fun Context.readerBackgroundColor(readerTheme: Int): Int = when (readerTheme) {
+    0 -> Color.WHITE // White
+    2 -> ReaderGrayBackgroundColor // Gray
+    3 -> if (isNightMode()) ReaderGrayBackgroundColor else Color.WHITE // Automatic
+    else -> Color.BLACK // Black
 }
 
 /**
@@ -123,14 +122,13 @@ fun Context.createReaderThemeContext(): Context {
     val preferences = graph.uiPreferences
     val readerPreferences = graph.readerPreferences
     val themeMode = preferences.themeMode.get()
-    val isDarkBackground = when (ReaderPreferences.ReaderTheme.fromValue(readerPreferences.readerTheme.get())) {
-        ReaderPreferences.ReaderTheme.BLACK, ReaderPreferences.ReaderTheme.GRAY -> true
-        // Automatic bg uses activity background by default
-        ReaderPreferences.ReaderTheme.AUTOMATIC -> when (themeMode) {
+    val isDarkBackground = when (readerPreferences.readerTheme.get()) {
+        1, 2 -> true // Black, Gray
+        3 -> when (themeMode) { // Automatic bg uses activity background by default
             ThemeMode.SYSTEM -> applicationContext.isNightMode()
             else -> themeMode == ThemeMode.DARK
         }
-        ReaderPreferences.ReaderTheme.WHITE -> false
+        else -> false // White
     }
     val expected = if (isDarkBackground) Configuration.UI_MODE_NIGHT_YES else Configuration.UI_MODE_NIGHT_NO
     if (resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK != expected) {

app/src/main/java/eu/kanade/tachiyomi/util/system/NetworkStateTracker.kt

@@ -24,3 +24,19 @@ fun Context.activeNetworkState(): NetworkState {
         isWifi = wifiManager.isWifiEnabled && capabilities?.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) ?: false,
     )
 }
+
+fun Context.networkStateFlow() = callbackFlow {
+    val networkCallback = object : NetworkCallback() {
+        override fun onCapabilitiesChanged(network: Network, networkCapabilities: NetworkCapabilities) {
+            trySend(activeNetworkState())
+        }
+        override fun onLost(network: Network) {
+            trySend(activeNetworkState())
+        }
+    }
+
+    connectivityManager.registerDefaultNetworkCallback(networkCallback)
+    awaitClose {
+        connectivityManager.unregisterNetworkCallback(networkCallback)
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/util/view/EditTextPreferenceExtensions.kt

@@ -0,0 +1,11 @@
+@file:Suppress("PackageDirectoryMismatch")
+
+package androidx.preference
+
+/**
+ * Returns package-private [EditTextPreference.getOnBindEditTextListener]
+ */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
+fun EditTextPreference.getOnBindEditTextListener(): EditTextPreference.OnBindEditTextListener? {
+    return onBindEditTextListener
+}

app/src/main/java/eu/kanade/tachiyomi/util/view/PreferenceExtensions.kt

@@ -1,25 +0,0 @@
-@file:Suppress("PackageDirectoryMismatch")
-
-package androidx.preference
-
-/**
- * Returns package-private [EditTextPreference.getOnBindEditTextListener]
- */
-@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
-fun EditTextPreference.getOnBindEditTextListener(): EditTextPreference.OnBindEditTextListener? {
-    return onBindEditTextListener
-}
-
-/**
- * Calls [onChange] whenever this preference's state, visibility or children change, the package-private hook
- * [PreferenceGroupAdapter] uses to rebind.
- */
-fun Preference.setOnStateChangeListener(onChange: (Preference) -> Unit) {
-    setOnPreferenceChangeInternalListener(
-        object : Preference.OnPreferenceChangeInternalListener {
-            override fun onPreferenceChange(preference: Preference) = onChange(preference)
-            override fun onPreferenceHierarchyChange(preference: Preference) = onChange(preference)
-            override fun onPreferenceVisibilityChange(preference: Preference) = onChange(preference)
-        },
-    )
-}

app/src/main/java/eu/kanade/tachiyomi/util/view/ViewExtensions.kt

@@ -5,7 +5,6 @@ package eu.kanade.tachiyomi.util.view
 import android.content.res.Resources
 import android.graphics.Rect
 import android.view.View
-import android.widget.EditText
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.compose.material3.LocalContentColor
@@ -16,13 +15,8 @@ import androidx.compose.runtime.CompositionContext
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.ui.platform.ComposeView
 import androidx.compose.ui.platform.ViewCompositionStrategy
-import androidx.core.view.inputmethod.EditorInfoCompat
 import dev.zacsweers.metrox.viewmodel.LocalMetroViewModelFactory
-import eu.kanade.domain.base.BasePreferences
 import eu.kanade.presentation.theme.TachiyomiTheme
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.onEach
 import mihon.app.di.appGraph
 
 inline fun ComponentActivity.setComposeContent(
@@ -71,19 +65,3 @@ fun View?.isVisibleOnScreen(): Boolean {
         Rect(0, 0, Resources.getSystem().displayMetrics.widthPixels, Resources.getSystem().displayMetrics.heightPixels)
     return actualPosition.intersect(screen)
 }
-
-/**
- * Sets [EditorInfoCompat.IME_FLAG_NO_PERSONALIZED_LEARNING] in imeOptions while [BasePreferences.incognitoMode] is
- * true. Some IMEs may not respect this flag.
- */
-fun EditText.setIncognito(basePreferences: BasePreferences, viewScope: CoroutineScope) {
-    basePreferences.incognitoMode.changes()
-        .onEach {
-            imeOptions = if (it) {
-                imeOptions or EditorInfoCompat.IME_FLAG_NO_PERSONALIZED_LEARNING
-            } else {
-                imeOptions and EditorInfoCompat.IME_FLAG_NO_PERSONALIZED_LEARNING.inv()
-            }
-        }
-        .launchIn(viewScope)
-}

app/src/main/java/eu/kanade/tachiyomi/widget/TachiyomiTextInputEditText.kt

@@ -0,0 +1,63 @@
+package eu.kanade.tachiyomi.widget
+
+import android.content.Context
+import android.util.AttributeSet
+import android.widget.EditText
+import androidx.appcompat.R
+import androidx.core.view.inputmethod.EditorInfoCompat
+import com.google.android.material.textfield.TextInputEditText
+import eu.kanade.domain.base.BasePreferences
+import eu.kanade.tachiyomi.widget.TachiyomiTextInputEditText.Companion.setIncognito
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import mihon.app.di.appGraph
+
+/**
+ * A custom [TextInputEditText] that sets [EditorInfoCompat.IME_FLAG_NO_PERSONALIZED_LEARNING] to imeOptions
+ * if [BasePreferences.incognitoMode] is true. Some IMEs may not respect this flag.
+ *
+ * @see setIncognito
+ */
+class TachiyomiTextInputEditText @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = R.attr.editTextStyle,
+) : TextInputEditText(context, attrs, defStyleAttr) {
+
+    private var scope: CoroutineScope? = null
+
+    override fun onAttachedToWindow() {
+        super.onAttachedToWindow()
+        scope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
+        val basePreferences = context.appGraph.basePreferences
+        setIncognito(basePreferences, scope!!)
+    }
+
+    override fun onDetachedFromWindow() {
+        super.onDetachedFromWindow()
+        scope?.cancel()
+        scope = null
+    }
+
+    companion object {
+        /**
+         * Sets Flow to this [EditText] that sets [EditorInfoCompat.IME_FLAG_NO_PERSONALIZED_LEARNING] to imeOptions
+         * if [BasePreferences.incognitoMode] is true. Some IMEs may not respect this flag.
+         */
+        fun EditText.setIncognito(basePreferences: BasePreferences, viewScope: CoroutineScope) {
+            basePreferences.incognitoMode.changes()
+                .onEach {
+                    imeOptions = if (it) {
+                        imeOptions or EditorInfoCompat.IME_FLAG_NO_PERSONALIZED_LEARNING
+                    } else {
+                        imeOptions and EditorInfoCompat.IME_FLAG_NO_PERSONALIZED_LEARNING.inv()
+                    }
+                }
+                .launchIn(viewScope)
+        }
+    }
+}

app/src/main/java/mihon/app/di/AppGraph.kt

@@ -18,6 +18,7 @@ import eu.kanade.tachiyomi.core.security.PrivacyPreferences
 import eu.kanade.tachiyomi.core.security.SecurityPreferences
 import eu.kanade.tachiyomi.data.backup.create.BackupCreateWorker
 import eu.kanade.tachiyomi.data.backup.restore.BackupRestoreWorker
+import eu.kanade.tachiyomi.data.cache.ChapterCache
 import eu.kanade.tachiyomi.data.cache.CoverCache
 import eu.kanade.tachiyomi.data.download.DownloadCache
 import eu.kanade.tachiyomi.data.download.DownloadManager
@@ -42,7 +43,6 @@ import eu.kanade.tachiyomi.util.CrashLogUtil
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.protobuf.ProtoBuf
 import mihon.core.metro.IsDebugBuild
-import mihon.data.cache.ChapterCache
 import mihon.domain.extension.interactor.GetExtensionStoreCountAsFlow
 import mihon.domain.extension.repository.ExtensionStoreRepository
 import nl.adaptivity.xmlutil.serialization.XML

app/src/main/java/mihon/data/cache/ChapterCache.kt

@@ -1,127 +0,0 @@
-package mihon.data.cache
-
-import android.content.Context
-import android.text.format.Formatter
-import dev.zacsweers.metro.AppScope
-import dev.zacsweers.metro.Inject
-import dev.zacsweers.metro.SingleIn
-import eu.kanade.tachiyomi.source.model.Page
-import eu.kanade.tachiyomi.ui.reader.model.DownloadStream
-import kotlinx.coroutines.CancellationException
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
-import kotlinx.serialization.json.Json
-import logcat.LogPriority
-import mihon.core.common.cache.TtlDiskCache
-import mihon.core.metro.AppCoroutineScope
-import okhttp3.Response
-import tachiyomi.core.common.util.system.logcat
-import tachiyomi.domain.chapter.model.Chapter
-import java.io.File
-import java.io.IOException
-import java.io.InputStream
-import kotlin.time.Duration.Companion.days
-import kotlin.time.Duration.Companion.hours
-
-/**
- * The page lists and images of chapters read online.
- *
- * Page lists expire soon, as sources sign or rotate their image URLs. Images last longer.
- */
-@Inject
-@SingleIn(AppScope::class)
-class ChapterCache(
-    private val context: Context,
-    private val json: Json,
-    @AppCoroutineScope scope: CoroutineScope,
-) {
-
-    private val root = File(context.cacheDir, "chapter_cache")
-
-    // Out of the cache directory, so the system clearing that leaves the indexes
-    private val indexes = File(context.noBackupFilesDir, "chapter_cache")
-
-    private val pageLists = TtlDiskCache(File(root, "pages"), File(indexes, "pages.index"), 1.hours, scope)
-
-    private val images = TtlDiskCache(File(root, "images"), File(indexes, "images.index"), 1.days, scope)
-
-    init {
-        scope.launch {
-            pageLists.warmUp()
-            images.warmUp()
-        }
-    }
-
-    suspend fun readableSize(): String = Formatter.formatFileSize(context, pageLists.totalSize() + images.totalSize())
-
-    suspend fun getPageList(chapter: Chapter): List<Page>? {
-        val input = pageLists.open(chapter.key) ?: return null
-        return try {
-            json.decodeFromString(withContext(Dispatchers.IO) { input.bufferedReader().use { it.readText() } })
-        } catch (e: Exception) {
-            if (e is CancellationException) throw e
-            logcat(LogPriority.WARN, e) { "Failed to read page list from cache" }
-            pageLists.remove(chapter.key)
-            null
-        }
-    }
-
-    suspend fun putPageList(chapter: Chapter, pages: List<Page>) {
-        try {
-            val value = json.encodeToString(pages).toByteArray()
-            pageLists.put(chapter.key) { it.write(value) }
-        } catch (e: Exception) {
-            if (e is CancellationException) throw e
-            logcat(LogPriority.WARN, e) { "Failed to put page list to cache" }
-        }
-    }
-
-    suspend fun isImageInCache(imageUrl: String): Boolean = imageUrl in images
-
-    /**
-     * The image's file, or null when it isn't cached.
-     */
-    suspend fun getImageFile(imageUrl: String): File? = images.get(imageUrl)
-
-    /**
-     * Opens the image, or returns null when it isn't cached.
-     */
-    suspend fun openImage(imageUrl: String): InputStream? = images.open(imageUrl)
-
-    suspend fun removeImage(imageUrl: String) {
-        images.remove(imageUrl)
-    }
-
-    /**
-     * Stores the image [response] holds, and closes it.
-     *
-     * @param live also receives the bytes as they arrive.
-     */
-    @Throws(IOException::class)
-    suspend fun putImage(imageUrl: String, response: Response, live: DownloadStream? = null): File {
-        response.body.use { body ->
-            live?.reserve(body.contentLength())
-            return images.put(imageUrl) { out ->
-                body.source().use { source ->
-                    val buffer = ByteArray(1 shl 16)
-                    while (true) {
-                        val n = source.read(buffer)
-                        if (n < 0) break
-                        out.write(buffer, 0, n)
-                        live?.append(buffer, 0, n)
-                    }
-                }
-            }
-        }
-    }
-
-    /**
-     * Removes everything, returning how many entries there were.
-     */
-    suspend fun clear(): Int = pageLists.clear() + images.clear()
-
-    private val Chapter.key: String
-        get() = "$mangaId$url"
-}

app/src/main/res/layout/pref_widget_switch_material.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.materialswitch.MaterialSwitch
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/switchWidget"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:focusable="false"
+    android:clickable="false"
+    android:background="@null"/>

app/src/main/res/layout/reader_activity.xml

@@ -0,0 +1,31 @@
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/reader_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <FrameLayout
+            android:id="@+id/viewer_container"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:descendantFocusability="blocksDescendants" />
+
+    </FrameLayout>
+
+    <eu.kanade.tachiyomi.ui.reader.ReaderNavigationOverlayView
+        android:id="@+id/navigation_overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:clickable="false"
+        android:focusable="false"
+        android:visibility="gone" />
+
+    <androidx.compose.ui.platform.ComposeView
+        android:id="@+id/compose_overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</FrameLayout>

app/src/main/res/layout/reader_error.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_gravity="center"
+    android:gravity="center">
+
+    <TextView
+        android:id="@+id/error_message"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:text="@string/decode_image_error"
+        android:textAppearance="?attr/textAppearanceBodyMedium" />
+
+    <eu.kanade.tachiyomi.ui.reader.viewer.ReaderButton
+        android:id="@+id/action_retry"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:text="@string/action_retry" />
+
+    <eu.kanade.tachiyomi.ui.reader.viewer.ReaderButton
+        android:id="@+id/action_open_in_web_view"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:text="@string/action_open_in_web_view"
+        android:visibility="gone" />
+
+</LinearLayout>

app/src/main/res/values/styles.xml

@@ -29,6 +29,8 @@
         <item name="android:textColor">?attr/colorOnBackground</item>
     </style>
 
+    <style name="TextAppearance.Tachiyomi.Preference.Secondary" parent="TextAppearance.Material3.BodySmall" />
+
 
     <!--=======================-->
     <!--Widgets.MaterialDivider-->
@@ -49,4 +51,17 @@
         <item name="elevationOverlayEnabled">@bool/elevationOverlayEnabled</item>
     </style>
 
+
+    <!--===========-->
+    <!--Preferences-->
+    <!--===========-->
+    <style name="PreferenceThemeOverlay.Tachiyomi">
+        <item name="preferenceCategoryTitleTextAppearance">?attr/textAppearanceBodyMedium</item>
+        <item name="switchPreferenceCompatStyle">@style/PreferenceThemeOverlay.Tachiyomi.SwitchPreferenceCompat</item>
+    </style>
+
+    <style name="PreferenceThemeOverlay.Tachiyomi.SwitchPreferenceCompat" parent="Preference.SwitchPreferenceCompat.Material">
+        <item name="android:widgetLayout">@layout/pref_widget_switch_material</item>
+    </style>
+
 </resources>