Improve text reader streaming and theming

app/build.gradle.kts

@@ -216,6 +216,7 @@ dependencies {
     implementation(projects.coreMetadata)
     implementation(projects.sourceApi)
     implementation(projects.sourceLocal)
+    implementation(libs.jsoup)
     implementation(projects.data)
     implementation(projects.domain)
     implementation(projects.presentationCore)

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

@@ -51,7 +51,10 @@ internal fun ColumnScope.GeneralPage(viewModel: ReaderSettingsViewModel) {
         themes.map { (labelRes, value) ->
             FilterChip(
                 selected = readerTheme == value,
-                onClick = { viewModel.preferences.readerTheme.set(value) },
+                onClick = {
+                    viewModel.preferences.readerTheme.set(value)
+                    viewModel.requestTextSettingsReload()
+                },
                 label = { Text(stringResource(labelRes)) },
             )
         }

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

@@ -31,9 +31,9 @@ internal fun ColumnScope.TextSettingsPage(viewModel: ReaderSettingsViewModel) {
     SliderItem(
         label = stringResource(MR.strings.pref_text_reader_font_size),
         value = fontSize,
-        valueRange = 32..72,
+        valueRange = 10..30,
         steps = 19,
-        valueString = fontSize.toString(),
+        valueString = "$fontSize sp",
         onChange = { value ->
             fontSizePref.set(value)
             viewModel.requestTextSettingsReload()
@@ -48,7 +48,7 @@ internal fun ColumnScope.TextSettingsPage(viewModel: ReaderSettingsViewModel) {
         value = lineSpacing,
         valueRange = 90..180,
         steps = 17,
-        valueString = "$lineSpacing%",
+        valueString = String.format("%.2fx", lineSpacing / 100f),
         onChange = { value ->
             lineSpacingPref.set(value)
             viewModel.requestTextSettingsReload()
@@ -61,9 +61,9 @@ internal fun ColumnScope.TextSettingsPage(viewModel: ReaderSettingsViewModel) {
     SliderItem(
         label = stringResource(MR.strings.pref_text_reader_paragraph_spacing),
         value = paragraphSpacing,
-        valueRange = 0..48,
+        valueRange = 0..16,
-        steps = 11,
+        steps = 15,
-        valueString = paragraphSpacing.toString(),
+        valueString = "$paragraphSpacing dp",
         onChange = { value ->
             paragraphSpacingPref.set(value)
             viewModel.requestTextSettingsReload()

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

@@ -828,7 +828,7 @@ class ReaderViewModel(
     fun previewTextReaderStyle() {
         val chapter = state.value.currentChapter ?: return
         if (chapter.pageLoader?.usesTextReaderStyle != true) return
-        val style = readerPreferences.textReaderStyle()
+        val style = readerPreferences.textReaderStyle(context)
         val textPages = chapter.pages?.filterIsInstance<TextReaderPage>().orEmpty()
         if (textPages.isEmpty()) return
 

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

@@ -34,9 +34,9 @@ internal class BookOasisFilePageLoader(
         val uniFile = UniFile.fromFile(file)
             ?: error("Unable to open cached BookOasis file: ${file.absolutePath}")
         val loader = when (ref.format) {
-            "epub" -> EpubPageLoader(uniFile.epubReader(context), textStyle)
+            "epub" -> EpubPageLoader(uniFile.epubReader(context), textStyle, context.cacheDir)
             "pdf" -> PdfPageLoader(context, uniFile)
-            "txt" -> TextPageLoader(uniFile, textStyle)
+            "txt" -> TextPageLoader(uniFile, textStyle, context.cacheDir)
             else -> error("Unsupported BookOasis document format: ${ref.format}")
         }
 

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

@@ -138,13 +138,13 @@ class ChapterLoader(
                 when (format) {
                     is Format.Directory -> DirectoryPageLoader(format.file)
                     is Format.Archive -> ArchivePageLoader(format.file.archiveReader(context))
-                    is Format.Epub -> EpubPageLoader(format.file.epubReader(context), readerPreferences.textReaderStyle())
+                    is Format.Epub -> EpubPageLoader(format.file.epubReader(context), readerPreferences.textReaderStyle(context), context.cacheDir)
                     is Format.Pdf -> PdfPageLoader(context, format.file)
-                    is Format.Text -> TextPageLoader(format.file, readerPreferences.textReaderStyle())
+                    is Format.Text -> TextPageLoader(format.file, readerPreferences.textReaderStyle(context), context.cacheDir)
                 }
             }
             source is HttpSource && source.isBookOasisSource() && bookOasisRef != null -> {
-                BookOasisFilePageLoader(context, source, bookOasisRef, readerPreferences.textReaderStyle())
+                BookOasisFilePageLoader(context, source, bookOasisRef, readerPreferences.textReaderStyle(context))
             }
             source is HttpSource && source.isKavitaSource() && kavitaChapterId != null -> {
                 KavitaCompatPageLoader(
@@ -153,7 +153,7 @@ class ChapterLoader(
                     source = source,
                     chapterCache = chapterCache,
                     chapterId = kavitaChapterId,
-                    textStyle = readerPreferences.textReaderStyle(),
+                    textStyle = readerPreferences.textReaderStyle(context),
                 )
             }
             source is HttpSource -> HttpPageLoader(chapter, source, chapterCache)

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

@@ -4,38 +4,135 @@ import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.setting.TextReaderStyle
 import mihon.core.archive.EpubReader
+import org.jsoup.Jsoup
+import java.io.File
+import java.io.InputStream
+import java.io.StringReader
 
 /**
  * Loader used to load a chapter from a .epub file.
  *
- * Text-based EPUBs are rendered as regular Mihon pages. Image-only EPUBs
+ * Text-based EPUBs are rendered as regular Mihon pages. EPUB spine documents
- * keep the original image extraction behavior.
+ * are processed one at a time so the full book text is never retained in heap.
+ * Image-only EPUBs keep the original image extraction behavior.
  */
 internal class EpubPageLoader(
     private val reader: EpubReader,
     private val style: TextReaderStyle,
+    private val cacheDir: File,
 ) : PageLoader() {
 
     override var isLocal: Boolean = true
     override val usesTextReaderStyle: Boolean = true
 
+    private var pageStore: TextPageStore? = null
+
     override suspend fun getPages(): List<ReaderPage> {
-        val textPages = reader.getTextFromPages()
+        check(!isRecycled)
-            .filter { it.isNotBlank() }
-            .flatMap { TextPageRenderer.paginate(it, style) }
 
-        if (textPages.isNotEmpty()) {
+        pageStore?.close()
-            return textPages.mapIndexed { index, text ->
+        pageStore = null
-                TextReaderPage(index, text, style)
+
+        val store = TextPageStore(cacheDir)
+        return try {
+            val textPages = buildTextPages(store)
+            if (textPages.isNotEmpty()) {
+                store.finishWriting()
+                pageStore = store
+                textPages
+            } else {
+                store.close()
+                reader.getImagesFromPages().mapIndexed { index, path ->
+                    ReaderPage(index).apply {
+                        stream = { reader.getInputStream(path)!! }
+                        status = Page.State.Ready
+                    }
+                }
+            }
+        } catch (e: Throwable) {
+            store.close()
+            throw e
+        }
+    }
+
+    private fun buildTextPages(store: TextPageStore): MutableList<ReaderPage> {
+        val packageHref = reader.getPackageHref()
+        val packageDocument = reader.getPackageDocument(packageHref)
+        val manifest = packageDocument.select("manifest > item")
+            .filter { item ->
+                val mediaType = item.attr("media-type")
+                mediaType == "application/xhtml+xml" || mediaType == "text/html"
+            }
+            .associateBy { it.attr("id") }
+        val spine = packageDocument.select("spine > itemref")
+            .map { it.attr("idref") }
+
+        val result = mutableListOf<ReaderPage>()
+        spine.forEach { id ->
+            val href = manifest[id]?.attr("href").orEmpty()
+            if (href.isBlank()) return@forEach
+
+            openEntry(packageHref, href)?.use { input ->
+                val text = extractText(input)
+                if (text.isBlank()) return@use
+
+                StringReader(text).use { textReader ->
+                    TextPageRenderer.paginate(textReader, style) { pageText ->
+                        val ref = store.append(pageText)
+                        result += TextReaderPage(
+                            index = result.size,
+                            pageTextProvider = { store.read(ref) },
+                            initialStyle = style,
+                        )
+                    }
+                }
             }
         }
+        return result
+    }
 
-        return reader.getImagesFromPages().mapIndexed { index, path ->
+    private fun extractText(input: InputStream): String {
-            ReaderPage(index).apply {
+        val pageDoc = Jsoup.parse(input, null, "")
-                stream = { reader.getInputStream(path)!! }
+        pageDoc.select("br").append("\n")
-                status = Page.State.Ready
+        pageDoc.select("p,div,li,h1,h2,h3,h4,h5,h6,blockquote").append("\n")
+        return pageDoc.body().wholeText()
+            ?.replace(Regex("[ \\t]+\\n"), "\n")
+            ?.replace(Regex("\\n{3,}"), "\n\n")
+            ?.trim()
+            .orEmpty()
+    }
+
+    private fun openEntry(packageHref: String, href: String): InputStream? {
+        val resolved = resolveEntryPath(packageHref, href)
+        val candidates = linkedSetOf(
+            resolved,
+            resolved.replace('\\', '/'),
+            resolved.replace('/', '\\'),
+        )
+        return candidates.firstNotNullOfOrNull { path ->
+            reader.getInputStream(path)
+        }
+    }
+
+    private fun resolveEntryPath(packageHref: String, href: String): String {
+        val relative = href
+            .substringBefore('#')
+            .substringBefore('?')
+            .trimStart('/', '\\')
+        val separator = if ('\\' in packageHref) '\\' else '/'
+        val base = packageHref.substringBeforeLast(separator, "")
+        val combined = if (base.isBlank()) relative else "$base$separator$relative"
+        val parts = combined.split('/', '\\')
+        val normalized = ArrayDeque<String>()
+
+        parts.forEach { part ->
+            when (part) {
+                "", "." -> Unit
+                ".." -> if (normalized.isNotEmpty()) normalized.removeLast()
+                else -> normalized.addLast(part)
             }
         }
+        return normalized.joinToString(separator.toString())
     }
 
     override suspend fun loadPage(page: ReaderPage) {
@@ -43,6 +140,8 @@ internal class EpubPageLoader(
     }
 
     override fun recycle() {
+        pageStore?.close()
+        pageStore = null
         super.recycle()
         reader.close()
     }

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

@@ -118,8 +118,8 @@ internal class KavitaCompatPageLoader(
             ?: throw IOException("Unable to open cached Kavita ${format.uppercase()} file")
 
         return when (format) {
-            "epub" -> EpubPageLoader(uniFile.epubReader(context), textStyle)
+            "epub" -> EpubPageLoader(uniFile.epubReader(context), textStyle, context.cacheDir)
-            "txt" -> TextPageLoader(uniFile, textStyle)
+            "txt" -> TextPageLoader(uniFile, textStyle, context.cacheDir)
             else -> error("Unsupported Kavita document format: $format")
         }
     }

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

@@ -3,8 +3,9 @@ package eu.kanade.tachiyomi.ui.reader.loader
 import com.hippo.unifile.UniFile
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.setting.TextReaderStyle
-import java.nio.ByteBuffer
+import java.io.File
-import java.nio.charset.CharacterCodingException
+import java.io.InputStreamReader
+import java.io.Reader
 import java.nio.charset.Charset
 import java.nio.charset.CodingErrorAction
 import java.nio.charset.StandardCharsets
@@ -12,36 +13,94 @@ import java.nio.charset.StandardCharsets
 internal class TextPageLoader(
     private val file: UniFile,
     private val style: TextReaderStyle,
+    private val cacheDir: File,
 ) : PageLoader() {
 
     override var isLocal: Boolean = true
     override val usesTextReaderStyle: Boolean = true
 
+    private var pageStore: TextPageStore? = null
+
     override suspend fun getPages(): List<ReaderPage> {
-        val bytes = file.openInputStream().use { it.readBytes() }
+        pageStore?.close()
-        val text = decodeText(bytes)
+        pageStore = null
-        return TextPageRenderer.paginate(text, style).mapIndexed { index, pageText ->
+
-            TextReaderPage(index, pageText, style)
+        val store = TextPageStore(cacheDir)
+        return try {
+            val pages = mutableListOf<ReaderPage>()
+            openDecodedReader().use { reader ->
+                TextPageRenderer.paginate(reader, style) { pageText ->
+                    val ref = store.append(pageText)
+                    pages += TextReaderPage(
+                        index = pages.size,
+                        pageTextProvider = { store.read(ref) },
+                        initialStyle = style,
+                    )
+                }
+            }
+            store.finishWriting()
+            pageStore = store
+            pages
+        } catch (e: Throwable) {
+            store.close()
+            throw e
         }
     }
 
-    private fun decodeText(bytes: ByteArray): String {
+    override fun recycle() {
-        if (bytes.size >= 3 &&
+        pageStore?.close()
-            bytes[0] == 0xEF.toByte() &&
+        pageStore = null
-            bytes[1] == 0xBB.toByte() &&
+        super.recycle()
-            bytes[2] == 0xBF.toByte()
+    }
-        ) {
+
-            return String(bytes, 3, bytes.size - 3, StandardCharsets.UTF_8)
+    private fun openDecodedReader(): Reader {
+        val charset = detectCharset()
+        return InputStreamReader(file.openInputStream().buffered(), charset)
+    }
+
+    private fun detectCharset(): Charset {
+        val prefix = ByteArray(3)
+        val prefixSize = file.openInputStream().buffered().use { input ->
+            input.read(prefix)
         }
 
+        if (
+            prefixSize >= 3 &&
+            prefix[0] == 0xEF.toByte() &&
+            prefix[1] == 0xBB.toByte() &&
+            prefix[2] == 0xBF.toByte()
+        ) {
+            return StandardCharsets.UTF_8
+        }
+        if (prefixSize >= 2 && prefix[0] == 0xFF.toByte() && prefix[1] == 0xFE.toByte()) {
+            return StandardCharsets.UTF_16LE
+        }
+        if (prefixSize >= 2 && prefix[0] == 0xFE.toByte() && prefix[1] == 0xFF.toByte()) {
+            return StandardCharsets.UTF_16BE
+        }
+
+        return if (isValidUtf8()) {
+            StandardCharsets.UTF_8
+        } else {
+            Charset.forName("MS949")
+        }
+    }
+
+    private fun isValidUtf8(): Boolean {
+        val decoder = StandardCharsets.UTF_8.newDecoder()
+            .onMalformedInput(CodingErrorAction.REPORT)
+            .onUnmappableCharacter(CodingErrorAction.REPORT)
+
         return try {
-            StandardCharsets.UTF_8.newDecoder()
+            InputStreamReader(file.openInputStream().buffered(), decoder).use { reader ->
-                .onMalformedInput(CodingErrorAction.REPORT)
+                val buffer = CharArray(8 * 1024)
-                .onUnmappableCharacter(CodingErrorAction.REPORT)
+                while (reader.read(buffer) >= 0) {
-                .decode(ByteBuffer.wrap(bytes))
+                    // Validation only. Decoded characters are intentionally discarded.
-                .toString()
+                }
-        } catch (_: CharacterCodingException) {
+            }
-            String(bytes, Charset.forName("MS949"))
+            true
+        } catch (_: Exception) {
+            false
         }
     }
 }

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

@@ -15,6 +15,7 @@ import eu.kanade.tachiyomi.ui.reader.setting.TextReaderStyle
 import java.io.ByteArrayInputStream
 import java.io.ByteArrayOutputStream
 import java.io.InputStream
+import java.io.Reader
 
 internal object TextPageRenderer {
     private const val PAGE_WIDTH = 1440
@@ -22,14 +23,88 @@ internal object TextPageRenderer {
     private const val MARGIN = 96
     private const val CONTENT_WIDTH = PAGE_WIDTH - (MARGIN * 2)
     private const val CONTENT_HEIGHT = PAGE_HEIGHT - (MARGIN * 2)
+    private const val STREAM_BUFFER_CHARS = 64 * 1024
+    private const val STREAM_READ_CHARS = 8 * 1024
 
     fun paginate(text: String, style: TextReaderStyle): List<String> {
         if (text.isBlank()) return emptyList()
 
-        val layout = createLayout(text, style)
+        return calculatePageSlices(text, style)
-        if (layout.lineCount == 0) return listOf(text)
+            .mapNotNull { slice ->
+                text.substring(slice.start, slice.endExclusive)
+                    .trim()
+                    .takeIf { it.isNotEmpty() }
+            }
+            .ifEmpty { listOf(text) }
+    }
 
-        val pages = mutableListOf<String>()
+    /**
+     * Incrementally paginates a text stream while keeping only a bounded text
+     * window in memory. The final incomplete page is retained between windows
+     * so normal page filling is preserved across chunk boundaries.
+     */
+    fun paginate(
+        reader: Reader,
+        style: TextReaderStyle,
+        onPage: (String) -> Unit,
+    ) {
+        val working = StringBuilder(STREAM_BUFFER_CHARS + STREAM_READ_CHARS)
+        val chars = CharArray(STREAM_READ_CHARS)
+        var firstChunk = true
+
+        while (true) {
+            val read = reader.read(chars)
+            if (read < 0) break
+            if (read == 0) continue
+
+            var offset = 0
+            if (firstChunk) {
+                firstChunk = false
+                if (chars[0] == '\uFEFF') {
+                    offset = 1
+                }
+            }
+            if (offset < read) {
+                working.append(chars, offset, read - offset)
+            }
+
+            if (working.length >= STREAM_BUFFER_CHARS) {
+                emitCompletePages(working, style, onPage)
+            }
+        }
+
+        if (working.isNotEmpty()) {
+            paginate(working.toString(), style).forEach(onPage)
+        }
+    }
+
+    private fun emitCompletePages(
+        working: StringBuilder,
+        style: TextReaderStyle,
+        onPage: (String) -> Unit,
+    ) {
+        val text = working.toString()
+        val slices = calculatePageSlices(text, style)
+        if (slices.size <= 1) return
+
+        for (index in 0 until slices.lastIndex) {
+            val slice = slices[index]
+            text.substring(slice.start, slice.endExclusive)
+                .trim()
+                .takeIf { it.isNotEmpty() }
+                ?.let(onPage)
+        }
+
+        working.delete(0, slices.last().start)
+    }
+
+    private fun calculatePageSlices(text: String, style: TextReaderStyle): List<PageSlice> {
+        if (text.isEmpty()) return emptyList()
+
+        val layout = createLayout(text, style)
+        if (layout.lineCount == 0) return listOf(PageSlice(0, text.length))
+
+        val pages = mutableListOf<PageSlice>()
         var startLine = 0
         while (startLine < layout.lineCount) {
             val startTop = layout.getLineTop(startLine)
@@ -43,16 +118,17 @@ internal object TextPageRenderer {
 
             val start = layout.getLineStart(startLine)
             val end = layout.getLineEnd(endLine).coerceAtLeast(start + 1).coerceAtMost(text.length)
-            text.substring(start, end).trim().takeIf { it.isNotEmpty() }?.let(pages::add)
+            pages += PageSlice(start, end)
             startLine = endLine + 1
         }
-        return pages.ifEmpty { listOf(text) }
+        return pages.ifEmpty { listOf(PageSlice(0, text.length)) }
     }
 
     fun render(text: String, style: TextReaderStyle): InputStream {
         val bitmap = Bitmap.createBitmap(PAGE_WIDTH, PAGE_HEIGHT, Bitmap.Config.ARGB_8888)
         val canvas = Canvas(bitmap)
-        canvas.drawColor(Color.WHITE)
+        val (backgroundColor, _) = resolveColors(style)
+        canvas.drawColor(backgroundColor)
         canvas.save()
         canvas.translate(MARGIN.toFloat(), MARGIN.toFloat())
         createLayout(text, style).draw(canvas)
@@ -65,15 +141,16 @@ internal object TextPageRenderer {
     }
 
     private fun createLayout(text: String, style: TextReaderStyle): StaticLayout {
+        val (_, textColor) = resolveColors(style)
         val paint = TextPaint().apply {
             isAntiAlias = true
-            color = Color.BLACK
+            color = textColor
-            textSize = style.fontSize.toFloat()
+            textSize = style.fontSize * 3f
             typeface = style.fontFamily.androidFamilyName
                 ?.let { Typeface.create(it, Typeface.NORMAL) }
                 ?: Typeface.DEFAULT
         }
-        val styledText = addParagraphSpacing(text, style.paragraphSpacing)
+        val styledText = addParagraphSpacing(text, style.paragraphSpacing * 3)
         return StaticLayout.Builder
             .obtain(styledText, 0, styledText.length, paint, CONTENT_WIDTH)
             .setAlignment(Layout.Alignment.ALIGN_NORMAL)
@@ -82,6 +159,22 @@ internal object TextPageRenderer {
             .build()
     }
 
+    private fun resolveColors(style: TextReaderStyle): Pair<Int, Int> {
+        val useDark = when (style.readerTheme) {
+            0 -> false
+            1 -> true
+            2 -> true
+            3 -> style.automaticDark
+            else -> style.automaticDark
+        }
+        val background = when (style.readerTheme) {
+            2 -> Color.rgb(48, 48, 48)
+            else -> if (useDark) Color.BLACK else Color.WHITE
+        }
+        val foreground = if (useDark) Color.WHITE else Color.BLACK
+        return background to foreground
+    }
+
     private fun addParagraphSpacing(text: String, spacing: Int): CharSequence {
         if (spacing <= 0 || '\n' !in text) return text
         val spannable = SpannableString(text)
@@ -111,4 +204,9 @@ internal object TextPageRenderer {
             fm.bottom += spacing
         }
     }
+
+    private data class PageSlice(
+        val start: Int,
+        val endExclusive: Int,
+    )
 }

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

@@ -0,0 +1,69 @@
+package eu.kanade.tachiyomi.ui.reader.loader
+
+import java.io.Closeable
+import java.io.File
+import java.io.RandomAccessFile
+import java.nio.charset.StandardCharsets
+
+/**
+ * Disk-backed storage for text reader pages.
+ *
+ * Keeping page strings here avoids retaining an entire large TXT/EPUB in the
+ * Java heap. Individual pages are loaded only when the viewer renders them.
+ */
+internal class TextPageStore(cacheRoot: File) : Closeable {
+
+    private val cacheDir = File(cacheRoot, "text_reader_pages").apply {
+        mkdirs()
+        pruneStaleFiles()
+    }
+    private val file = File.createTempFile("pages-", ".utf8", cacheDir)
+    private var writer: RandomAccessFile? = RandomAccessFile(file, "rw")
+
+    @Synchronized
+    fun append(text: String): PageRef {
+        val output = checkNotNull(writer) { "Text page store is already finalized" }
+        val bytes = text.toByteArray(StandardCharsets.UTF_8)
+        val offset = output.filePointer
+        output.write(bytes)
+        return PageRef(offset, bytes.size)
+    }
+
+    @Synchronized
+    fun finishWriting() {
+        writer?.fd?.sync()
+        writer?.close()
+        writer = null
+    }
+
+    fun read(ref: PageRef): String {
+        val bytes = ByteArray(ref.byteLength)
+        RandomAccessFile(file, "r").use { input ->
+            input.seek(ref.offset)
+            input.readFully(bytes)
+        }
+        return String(bytes, StandardCharsets.UTF_8)
+    }
+
+    override fun close() {
+        writer?.close()
+        writer = null
+        file.delete()
+    }
+
+    internal data class PageRef(
+        val offset: Long,
+        val byteLength: Int,
+    )
+
+    private fun File.pruneStaleFiles() {
+        val cutoff = System.currentTimeMillis() - STALE_FILE_AGE_MS
+        listFiles()
+            ?.filter { it.isFile && it.lastModified() < cutoff }
+            ?.forEach { it.delete() }
+    }
+
+    private companion object {
+        const val STALE_FILE_AGE_MS = 24L * 60L * 60L * 1000L
+    }
+}

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

@@ -11,7 +11,7 @@ import eu.kanade.tachiyomi.ui.reader.setting.TextReaderStyle
  */
 internal class TextReaderPage(
     index: Int,
-    private val pageText: String,
+    private val pageTextProvider: () -> String,
     initialStyle: TextReaderStyle,
 ) : ReaderPage(index) {
 
@@ -19,10 +19,16 @@ internal class TextReaderPage(
     private var style: TextReaderStyle = initialStyle
 
     init {
-        stream = { TextPageRenderer.render(pageText, style) }
+        stream = { TextPageRenderer.render(pageTextProvider(), style) }
         status = Page.State.Ready
     }
 
+    constructor(
+        index: Int,
+        pageText: String,
+        initialStyle: TextReaderStyle,
+    ) : this(index, { pageText }, initialStyle)
+
     fun updateStyle(newStyle: TextReaderStyle) {
         style = newStyle
     }

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

@@ -1,5 +1,7 @@
 package eu.kanade.tachiyomi.ui.reader.setting
 
+import android.content.Context
+import android.content.res.Configuration
 import android.os.Build
 import androidx.compose.ui.graphics.BlendMode
 import dev.icerock.moko.resources.StringResource
@@ -11,6 +13,7 @@ import tachiyomi.core.common.preference.PreferenceStore
 import tachiyomi.core.common.preference.getEnum
 import tachiyomi.core.common.preference.getEnumSet
 import tachiyomi.i18n.MR
+import kotlin.math.roundToInt
 
 @Inject
 @SingleIn(AppScope::class)
@@ -110,22 +113,38 @@ class ReaderPreferences(
 
     // region Text reader
 
-    val textFontSize: Preference<Int> = preferenceStore.getInt("reader_text_font_size", 44)
+    val textFontSize: Preference<Int> = preferenceStore.getInt("reader_text_font_size", 16)
 
     val textLineSpacing: Preference<Int> = preferenceStore.getInt("reader_text_line_spacing", 115)
 
-    val textParagraphSpacing: Preference<Int> = preferenceStore.getInt("reader_text_paragraph_spacing", 12)
+    val textParagraphSpacing: Preference<Int> = preferenceStore.getInt("reader_text_paragraph_spacing", 4)
 
     val textFontFamily: Preference<TextFontFamily> = preferenceStore.getEnum(
         "reader_text_font_family",
         TextFontFamily.SYSTEM,
     )
 
-    fun textReaderStyle() = TextReaderStyle(
+    private val textUnitsMigrated = preferenceStore.getBoolean("reader_text_units_v2_migrated", false)
+
+    init {
+        if (!textUnitsMigrated.get()) {
+            val legacyFontSize = textFontSize.get()
+            if (legacyFontSize > 30) {
+                textFontSize.set((legacyFontSize / 3f).roundToInt().coerceIn(10, 30))
+                textParagraphSpacing.set((textParagraphSpacing.get() / 3f).roundToInt().coerceIn(0, 16))
+            }
+            textUnitsMigrated.set(true)
+        }
+    }
+
+    fun textReaderStyle(context: Context) = TextReaderStyle(
         fontSize = textFontSize.get(),
         lineSpacingPercent = textLineSpacing.get(),
         paragraphSpacing = textParagraphSpacing.get(),
         fontFamily = textFontFamily.get(),
+        readerTheme = readerTheme.get(),
+        automaticDark = (context.resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK) ==
+            Configuration.UI_MODE_NIGHT_YES,
     )
 
     // endregion
@@ -378,4 +397,6 @@ data class TextReaderStyle(
     val lineSpacingPercent: Int,
     val paragraphSpacing: Int,
     val fontFamily: ReaderPreferences.TextFontFamily,
+    val readerTheme: Int,
+    val automaticDark: Boolean,
 )

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

@@ -38,7 +38,7 @@ class ReaderSettingsViewModel(
         textSettingsDirty = true
         textSettingsReloadJob?.cancel()
         textSettingsReloadJob = viewModelScope.launch {
-            delay(100)
+            delay(200)
             onTextSettingsPreview()
             textSettingsReloadJob = null
         }