Add auto split tall images setting

Also includes some fixes for bad merges in earlier commits

Co-authored-by: Saud-97 <Saud-97@users.noreply.github.com>
Co-authored-by: AntsyLich <AntsyLich@users.noreply.github.com>

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

@@ -273,7 +273,7 @@ class Downloader(
 
             // Start downloader if needed
             if (autoStart && wasEmpty) {
-                val queuedDownloads = queue.filter { it.source !is UnmeteredSource }.count()
+                val queuedDownloads = queue.count { it.source !is UnmeteredSource }
                 val maxDownloadsFromSource = queue
                     .groupBy { it.source }
                     .filterKeys { it !is UnmeteredSource }
@@ -352,6 +352,7 @@ class Downloader(
             .doOnNext { ensureSuccessfulDownload(download, mangaDir, tmpDir, chapterDirname) }
             // If the page list threw, it will resume here
             .onErrorReturn { error ->
+                logcat(LogPriority.ERROR, error)
                 download.status = Download.State.ERROR
                 notifier.onError(error.message, download.chapter.name, download.manga.title)
                 download
@@ -379,7 +380,7 @@ class Downloader(
         tmpFile?.delete()
 
         // Try to find the image file.
-        val imageFile = tmpDir.listFiles()!!.find { it.name!!.startsWith("$filename.") }
+        val imageFile = tmpDir.listFiles()!!.find { it.name!!.startsWith("$filename.") || it.name!!.contains("${filename}__001") }
 
         // If the image is already downloaded, do nothing. Otherwise download from network
         val pageObservable = when {
@@ -389,8 +390,12 @@ class Downloader(
         }
 
         return pageObservable
-            // When the image is ready, set image path, progress (just in case) and status
+            // When the page is ready, set page path, progress (just in case) and status
             .doOnNext { file ->
+                val success = splitTallImageIfNeeded(page, tmpDir)
+                if (success.not()) {
+                    notifier.onError(context.getString(R.string.download_notifier_split_failed), download.chapter.name, download.manga.title)
+                }
                 page.uri = file.uri
                 page.progress = 100
                 download.downloadedImages++
@@ -401,6 +406,7 @@ class Downloader(
             .onErrorReturn {
                 page.progress = 0
                 page.status = Page.ERROR
+                notifier.onError(it.message, download.chapter.name, download.manga.title)
                 page
             }
     }
@@ -474,6 +480,26 @@ class Downloader(
         return ImageUtil.getExtensionFromMimeType(mime)
     }
 
+    private fun splitTallImageIfNeeded(page: Page, tmpDir: UniFile): Boolean {
+        if (!preferences.splitTallImages().get()) return true
+
+        val filename = String.format("%03d", page.number)
+        val imageFile = tmpDir.listFiles()?.find { it.name!!.startsWith(filename) }
+            ?: throw Error(context.getString(R.string.download_notifier_split_page_not_found, page.number))
+        val imageFilePath = imageFile.filePath
+            ?: throw Error(context.getString(R.string.download_notifier_split_page_path_not_found, page.number))
+
+        // check if the original page was previously splitted before then skip.
+        if (imageFile.name!!.contains("__")) return true
+
+        return try {
+            ImageUtil.splitTallImage(imageFile, imageFilePath)
+        } catch (e: Exception) {
+            logcat(LogPriority.ERROR, e)
+            false
+        }
+    }
+
     /**
      * Checks if the download was successful.
      *
@@ -489,16 +515,10 @@ class Downloader(
         dirname: String,
     ) {
         // Ensure that the chapter folder has all the images.
-        val downloadedImages = tmpDir.listFiles().orEmpty().filterNot { it.name!!.endsWith(".tmp") }
+        val downloadedImages = tmpDir.listFiles().orEmpty().filterNot { it.name!!.endsWith(".tmp") || (it.name!!.contains("__") && !it.name!!.contains("__001.jpg")) }
 
         download.status = if (downloadedImages.size == download.pages!!.size) {
-            Download.State.DOWNLOADED
-        } else {
-            Download.State.ERROR
-        }
-
             // Only rename the directory if it's downloaded.
-        if (download.status == Download.State.DOWNLOADED) {
             if (preferences.saveChaptersAsCBZ().get()) {
                 archiveChapter(mangaDir, dirname, tmpDir)
             } else {
@@ -507,6 +527,10 @@ class Downloader(
             cache.addChapter(dirname, mangaDir, download.manga)
 
             DiskUtil.createNoMediaFile(tmpDir, context)
+
+            Download.State.DOWNLOADED
+        } else {
+            Download.State.ERROR
         }
     }
 

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -206,6 +206,8 @@ class PreferencesHelper(val context: Context) {
 
     fun saveChaptersAsCBZ() = flowPrefs.getBoolean("save_chapter_as_cbz", true)
 
+    fun splitTallImages() = flowPrefs.getBoolean("split_tall_images", false)
+
     fun folderPerManga() = prefs.getBoolean(Keys.folderPerManga, false)
 
     fun numberOfBackups() = flowPrefs.getInt("backup_slots", 2)

app/src/main/java/eu/kanade/tachiyomi/data/track/myanimelist/MyAnimeListInterceptor.kt

@@ -1,7 +1,6 @@
 package eu.kanade.tachiyomi.data.track.myanimelist
 
 import eu.kanade.tachiyomi.network.parseAs
-import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 import okhttp3.Interceptor
 import okhttp3.Response

app/src/main/java/eu/kanade/tachiyomi/source/LocalSource.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import com.github.junrar.Archive
 import com.hippo.unifile.UniFile
 import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.cache.CoverCache
 import eu.kanade.tachiyomi.source.model.Filter
 import eu.kanade.tachiyomi.source.model.FilterList
 import eu.kanade.tachiyomi.source.model.MangasPage
@@ -31,6 +32,8 @@ import logcat.LogPriority
 import rx.Observable
 import tachiyomi.source.model.ChapterInfo
 import tachiyomi.source.model.MangaInfo
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
 import uy.kohesive.injekt.injectLazy
 import java.io.File
 import java.io.FileInputStream
@@ -40,6 +43,7 @@ import java.util.zip.ZipFile
 
 class LocalSource(
     private val context: Context,
+    private val coverCache: CoverCache = Injekt.get(),
 ) : CatalogueSource, UnmeteredSource {
 
     private val json: Json by injectLazy()

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

@@ -19,6 +19,7 @@ import rx.Observable
 import rx.Subscription
 import rx.android.schedulers.AndroidSchedulers
 import rx.schedulers.Schedulers
+import java.io.BufferedInputStream
 import java.io.ByteArrayInputStream
 import java.io.InputStream
 import java.util.concurrent.TimeUnit
@@ -238,7 +239,7 @@ class PagerPageHolder(
             .subscribe({}, {})
     }
 
-    private fun process(page: ReaderPage, imageStream: InputStream): InputStream {
+    private fun process(page: ReaderPage, imageStream: BufferedInputStream): InputStream {
         if (!viewer.config.dualPageSplit) {
             return imageStream
         }
@@ -247,7 +248,7 @@ class PagerPageHolder(
             return splitInHalf(imageStream)
         }
 
-        val isDoublePage = ImageUtil.isDoublePage(imageStream)
+        val isDoublePage = ImageUtil.isWideImage(imageStream)
         if (!isDoublePage) {
             return imageStream
         }

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

@@ -23,6 +23,7 @@ import rx.Observable
 import rx.Subscription
 import rx.android.schedulers.AndroidSchedulers
 import rx.schedulers.Schedulers
+import java.io.BufferedInputStream
 import java.io.InputStream
 import java.util.concurrent.TimeUnit
 
@@ -272,12 +273,12 @@ class WebtoonPageHolder(
         addSubscription(readImageHeaderSubscription)
     }
 
-    private fun process(imageStream: InputStream): InputStream {
+    private fun process(imageStream: BufferedInputStream): InputStream {
         if (!viewer.config.dualPageSplit) {
             return imageStream
         }
 
-        val isDoublePage = ImageUtil.isDoublePage(imageStream)
+        val isDoublePage = ImageUtil.isWideImage(imageStream)
         if (!isDoublePage) {
             return imageStream
         }

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

@@ -24,6 +24,7 @@ import eu.kanade.tachiyomi.util.preference.multiSelectListPreference
 import eu.kanade.tachiyomi.util.preference.onClick
 import eu.kanade.tachiyomi.util.preference.preference
 import eu.kanade.tachiyomi.util.preference.preferenceCategory
+import eu.kanade.tachiyomi.util.preference.summaryRes
 import eu.kanade.tachiyomi.util.preference.switchPreference
 import eu.kanade.tachiyomi.util.preference.titleRes
 import eu.kanade.tachiyomi.util.system.toast
@@ -72,6 +73,12 @@ class SettingsDownloadController : SettingsController() {
             bindTo(preferences.saveChaptersAsCBZ())
             titleRes = R.string.save_chapter_as_cbz
         }
+        switchPreference {
+            bindTo(preferences.splitTallImages())
+            titleRes = R.string.split_tall_images
+            summaryRes = R.string.split_tall_images_summary
+        }
+
         preferenceCategory {
             titleRes = R.string.pref_category_delete_chapters
 

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

@@ -47,6 +47,7 @@ import logcat.LogPriority
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 import java.io.File
+import kotlin.math.max
 import kotlin.math.roundToInt
 
 private const val TABLET_UI_MIN_SCREEN_WIDTH_DP = 720
@@ -166,6 +167,9 @@ fun Context.hasPermission(permission: String) = ContextCompat.checkSelfPermissio
     }
 }
 
+val getDisplayMaxHeightInPx: Int
+    get() = Resources.getSystem().displayMetrics.let { max(it.heightPixels, it.widthPixels) }
+
 /**
  * Converts to dp.
  */
@@ -258,7 +262,7 @@ fun Context.openInBrowser(uri: Uri, forceDefaultBrowser: Boolean = false) {
 }
 
 fun Context.defaultBrowserPackageName(): String? {
-    val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse("http://"))
+    val browserIntent = Intent(Intent.ACTION_VIEW, "http://".toUri())
     return packageManager.resolveActivity(browserIntent, PackageManager.MATCH_DEFAULT_ONLY)
         ?.activityInfo?.packageName
         ?.takeUnless { it in DeviceUtil.invalidDefaultBrowsers }
@@ -315,8 +319,8 @@ fun Context.isNightMode(): Boolean {
  * https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:appcompat/appcompat/src/main/java/androidx/appcompat/app/AppCompatDelegateImpl.java;l=348;drc=e28752c96fc3fb4d3354781469a1af3dbded4898
  */
 fun Context.createReaderThemeContext(): Context {
-    val prefs = Injekt.get<PreferencesHelper>()
+    val preferences = Injekt.get<PreferencesHelper>()
-    val isDarkBackground = when (prefs.readerTheme().get()) {
+    val isDarkBackground = when (preferences.readerTheme().get()) {
         1, 2 -> true // Black, Gray
         3 -> applicationContext.isNightMode() // Automatic bg uses activity background by default
         else -> false // White
@@ -329,7 +333,7 @@ fun Context.createReaderThemeContext(): Context {
 
         val wrappedContext = ContextThemeWrapper(this, R.style.Theme_Tachiyomi)
         wrappedContext.applyOverrideConfiguration(overrideConf)
-        ThemingDelegate.getThemeResIds(prefs.appTheme().get(), prefs.themeDarkAmoled().get())
+        ThemingDelegate.getThemeResIds(preferences.appTheme().get(), preferences.themeDarkAmoled().get())
             .forEach { wrappedContext.theme.applyStyle(it, true) }
         return wrappedContext
     }

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

@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.res.Configuration
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
+import android.graphics.BitmapRegionDecoder
 import android.graphics.Color
 import android.graphics.Rect
 import android.graphics.drawable.ColorDrawable
@@ -11,19 +12,27 @@ import android.graphics.drawable.Drawable
 import android.graphics.drawable.GradientDrawable
 import android.os.Build
 import android.webkit.MimeTypeMap
+import androidx.annotation.ColorInt
 import androidx.core.graphics.alpha
 import androidx.core.graphics.applyCanvas
 import androidx.core.graphics.blue
 import androidx.core.graphics.createBitmap
+import androidx.core.graphics.get
 import androidx.core.graphics.green
 import androidx.core.graphics.red
+import com.hippo.unifile.UniFile
+import logcat.LogPriority
 import tachiyomi.decoder.Format
 import tachiyomi.decoder.ImageDecoder
+import java.io.BufferedInputStream
 import java.io.ByteArrayInputStream
 import java.io.ByteArrayOutputStream
+import java.io.File
+import java.io.FileOutputStream
 import java.io.InputStream
 import java.net.URLConnection
 import kotlin.math.abs
+import kotlin.math.min
 
 object ImageUtil {
 
@@ -73,8 +82,7 @@ object ImageUtil {
                 Format.Webp -> type.isAnimated && Build.VERSION.SDK_INT >= Build.VERSION_CODES.P
                 else -> false
             }
-        } catch (e: Exception) {
+        } catch (e: Exception) { /* Do Nothing */ }
-        }
         return false
     }
 
@@ -106,19 +114,12 @@ object ImageUtil {
     }
 
     /**
-     * Check whether the image is a double-page spread
+     * Check whether the image is wide (which we consider a double-page spread).
+     *
      * @return true if the width is greater than the height
      */
-    fun isDoublePage(imageStream: InputStream): Boolean {
+    fun isWideImage(imageStream: BufferedInputStream): Boolean {
-        imageStream.mark(imageStream.available() + 1)
+        val options = extractImageOptions(imageStream)
-
-        val imageBytes = imageStream.readBytes()
-
-        val options = BitmapFactory.Options().apply { inJustDecodeBounds = true }
-        BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.size, options)
-
-        imageStream.reset()
-
         return options.outWidth > options.outHeight
     }
 
@@ -185,6 +186,111 @@ object ImageUtil {
         RIGHT, LEFT
     }
 
+    /**
+     * Check whether the image is considered a tall image.
+     *
+     * @return true if the height:width ratio is greater than 3.
+     */
+    private fun isTallImage(imageStream: InputStream): Boolean {
+        val options = extractImageOptions(imageStream, resetAfterExtraction = false)
+        return (options.outHeight / options.outWidth) > 3
+    }
+
+    /**
+     * Splits tall images to improve performance of reader
+     */
+    fun splitTallImage(imageFile: UniFile, imageFilePath: String): Boolean {
+        if (isAnimatedAndSupported(imageFile.openInputStream()) || !isTallImage(imageFile.openInputStream())) {
+            return true
+        }
+
+        val options = extractImageOptions(imageFile.openInputStream(), resetAfterExtraction = false).apply { inJustDecodeBounds = false }
+        // Values are stored as they get modified during split loop
+        val imageHeight = options.outHeight
+        val imageWidth = options.outWidth
+
+        val splitHeight = (getDisplayMaxHeightInPx * 1.5).toInt()
+        // -1 so it doesn't try to split when imageHeight = getDisplayHeightInPx
+        val partCount = (imageHeight - 1) / splitHeight + 1
+
+        val optimalSplitHeight = imageHeight / partCount
+
+        val splitDataList = (0 until partCount).fold(mutableListOf<SplitData>()) { list, index ->
+            list.apply {
+                // Only continue if the list is empty or there is image remaining
+                if (isEmpty() || imageHeight > last().bottomOffset) {
+                    val topOffset = index * optimalSplitHeight
+                    var outputImageHeight = min(optimalSplitHeight, imageHeight - topOffset)
+
+                    val remainingHeight = imageHeight - (topOffset + outputImageHeight)
+                    // If remaining height is smaller or equal to 1/3th of
+                    // optimal split height then include it in current page
+                    if (remainingHeight <= (optimalSplitHeight / 3)) {
+                        outputImageHeight += remainingHeight
+                    }
+                    add(SplitData(index, topOffset, outputImageHeight))
+                }
+            }
+        }
+
+        val bitmapRegionDecoder = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+            BitmapRegionDecoder.newInstance(imageFile.openInputStream())
+        } else {
+            @Suppress("DEPRECATION")
+            BitmapRegionDecoder.newInstance(imageFile.openInputStream(), false)
+        }
+
+        if (bitmapRegionDecoder == null) {
+            logcat { "Failed to create new instance of BitmapRegionDecoder" }
+            return false
+        }
+
+        logcat {
+            "Splitting image with height of $imageHeight into $partCount part " +
+                "with estimated ${optimalSplitHeight}px height per split"
+        }
+
+        return try {
+            splitDataList.forEach { splitData ->
+                val splitPath = splitImagePath(imageFilePath, splitData.index)
+
+                val region = Rect(0, splitData.topOffset, imageWidth, splitData.bottomOffset)
+
+                FileOutputStream(splitPath).use { outputStream ->
+                    val splitBitmap = bitmapRegionDecoder.decodeRegion(region, options)
+                    splitBitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream)
+                    splitBitmap.recycle()
+                }
+                logcat {
+                    "Success: Split #${splitData.index + 1} with topOffset=${splitData.topOffset} " +
+                        "height=${splitData.outputImageHeight} bottomOffset=${splitData.bottomOffset}"
+                }
+            }
+            imageFile.delete()
+            true
+        } catch (e: Exception) {
+            // Image splits were not successfully saved so delete them and keep the original image
+            splitDataList
+                .map { splitImagePath(imageFilePath, it.index) }
+                .forEach { File(it).delete() }
+            logcat(LogPriority.ERROR, e)
+            false
+        } finally {
+            bitmapRegionDecoder.recycle()
+        }
+    }
+
+    private fun splitImagePath(imageFilePath: String, index: Int) =
+        imageFilePath.substringBeforeLast(".") + "__${"%03d".format(index + 1)}.jpg"
+
+    data class SplitData(
+        val index: Int,
+        val topOffset: Int,
+        val outputImageHeight: Int,
+    ) {
+        val bottomOffset = topOffset + outputImageHeight
+    }
+
     /**
      * Algorithm for determining what background to accompany a comic/manga page
      */
@@ -209,14 +315,14 @@ object ImageUtil {
         val leftOffsetX = left - offsetX
         val rightOffsetX = right + offsetX
 
-        val topLeftPixel = image.getPixel(left, top)
+        val topLeftPixel = image[left, top]
-        val topRightPixel = image.getPixel(right, top)
+        val topRightPixel = image[right, top]
-        val midLeftPixel = image.getPixel(left, midY)
+        val midLeftPixel = image[left, midY]
-        val midRightPixel = image.getPixel(right, midY)
+        val midRightPixel = image[right, midY]
-        val topCenterPixel = image.getPixel(midX, top)
+        val topCenterPixel = image[midX, top]
-        val botLeftPixel = image.getPixel(left, bot)
+        val botLeftPixel = image[left, bot]
-        val bottomCenterPixel = image.getPixel(midX, bot)
+        val bottomCenterPixel = image[midX, bot]
-        val botRightPixel = image.getPixel(right, bot)
+        val botRightPixel = image[right, bot]
 
         val topLeftIsDark = topLeftPixel.isDark()
         val topRightIsDark = topRightPixel.isDark()
@@ -269,8 +375,8 @@ object ImageUtil {
             var whiteStreak = false
             val notOffset = x == left || x == right
             inner@ for ((index, y) in (0 until image.height step image.height / 25).withIndex()) {
-                val pixel = image.getPixel(x, y)
+                val pixel = image[x, y]
-                val pixelOff = image.getPixel(x + (if (x < image.width / 2) -offsetX else offsetX), y)
+                val pixelOff = image[x + (if (x < image.width / 2) -offsetX else offsetX), y]
                 if (pixel.isWhite()) {
                     whitePixelsStreak++
                     whitePixels++
@@ -361,8 +467,8 @@ object ImageUtil {
         val topCornersIsDark = topLeftIsDark && topRightIsDark
         val botCornersIsDark = botLeftIsDark && botRightIsDark
 
-        val topOffsetCornersIsDark = image.getPixel(leftOffsetX, top).isDark() && image.getPixel(rightOffsetX, top).isDark()
+        val topOffsetCornersIsDark = image[leftOffsetX, top].isDark() && image[rightOffsetX, top].isDark()
-        val botOffsetCornersIsDark = image.getPixel(leftOffsetX, bot).isDark() && image.getPixel(rightOffsetX, bot).isDark()
+        val botOffsetCornersIsDark = image[leftOffsetX, bot].isDark() && image[rightOffsetX, bot].isDark()
 
         val gradient = when {
             darkBG && botCornersIsWhite -> {
@@ -391,15 +497,31 @@ object ImageUtil {
         )
     }
 
-    private fun Int.isDark(): Boolean =
+    private fun @receiver:ColorInt Int.isDark(): Boolean =
         red < 40 && blue < 40 && green < 40 && alpha > 200
 
-    private fun Int.isCloseTo(other: Int): Boolean =
+    private fun @receiver:ColorInt Int.isCloseTo(other: Int): Boolean =
         abs(red - other.red) < 30 && abs(green - other.green) < 30 && abs(blue - other.blue) < 30
 
-    private fun Int.isWhite(): Boolean =
+    private fun @receiver:ColorInt Int.isWhite(): Boolean =
         red + blue + green > 740
 
+    /**
+     * Used to check an image's dimensions without loading it in the memory.
+     */
+    private fun extractImageOptions(
+        imageStream: InputStream,
+        resetAfterExtraction: Boolean = true,
+    ): BitmapFactory.Options {
+        imageStream.mark(imageStream.available() + 1)
+
+        val imageBytes = imageStream.readBytes()
+        val options = BitmapFactory.Options().apply { inJustDecodeBounds = true }
+        BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.size, options)
+        if (resetAfterExtraction) imageStream.reset()
+        return options
+    }
+
     // Android doesn't include some mappings
     private val SUPPLEMENTARY_MIMETYPE_MAPPING = mapOf(
         // https://issuetracker.google.com/issues/182703810

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

@@ -410,6 +410,8 @@
     <string name="pref_download_new">Download new chapters</string>
     <string name="pref_download_new_categories_details">Manga in excluded categories will not be downloaded even if they are also in included categories.</string>
     <string name="save_chapter_as_cbz">Save as CBZ archive</string>
+    <string name="split_tall_images">Auto split tall images</string>
+    <string name="split_tall_images_summary">Improves reader performance by splitting tall downloaded images.</string>
 
       <!-- Tracking section -->
     <string name="tracking_guide">Tracking guide</string>
@@ -809,6 +811,9 @@
     <string name="download_notifier_no_network">No network connection available</string>
     <string name="download_notifier_download_paused">Download paused</string>
     <string name="download_notifier_download_finish">Download completed</string>
+    <string name="download_notifier_split_page_not_found">Page %d not found while splitting</string>
+    <string name="download_notifier_split_page_path_not_found">Couldn\'t find file path of page %d</string>
+    <string name="download_notifier_split_failed">Couldn\'t split downloaded image</string>
 
     <!-- Notification channels -->
     <string name="channel_common">Common</string>