Moved logic to first load of page stream

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

@@ -1,11 +1,17 @@
 package eu.kanade.tachiyomi.ui.reader.loader
 
+import android.graphics.BitmapFactory
 import eu.kanade.tachiyomi.data.cache.ChapterCache
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.data.preference.getOrDefault
 import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
+import eu.kanade.tachiyomi.ui.reader.viewer.pager.PagerConfig
+import eu.kanade.tachiyomi.util.ImageUtil
 import eu.kanade.tachiyomi.util.plusAssign
+import kotlinx.coroutines.experimental.async
 import rx.Completable
 import rx.Observable
 import rx.schedulers.Schedulers
@@ -15,6 +21,7 @@ import rx.subscriptions.CompositeSubscription
 import timber.log.Timber
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
+import uy.kohesive.injekt.injectLazy
 import java.util.concurrent.PriorityBlockingQueue
 import java.util.concurrent.atomic.AtomicInteger
 
@@ -37,6 +44,11 @@ class HttpPageLoader(
      */
     private val subscriptions = CompositeSubscription()
 
+    /**
+     * Preferences helper.
+     */
+    private val preferences by injectLazy<PreferencesHelper>()
+
     init {
         subscriptions += Observable.defer { Observable.just(queue.take().page) }
             .filter { it.status == Page.QUEUE }
@@ -206,6 +218,10 @@ class HttpPageLoader(
             }
             .doOnNext {
                 page.stream = { chapterCache.getImageFile(imageUrl).inputStream() }
+                if (preferences.readerTheme().get() == 2) {
+                    val image = BitmapFactory.decodeStream(chapterCache.getImageFile(imageUrl).inputStream())
+                    page.bg = ImageUtil.autoSetBackground(image)
+                }
                 page.status = Page.READY
             }
             .doOnError { page.status = Page.ERROR }

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

@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.ui.reader.model
 
+import android.graphics.drawable.Drawable
 import eu.kanade.tachiyomi.source.model.Page
 import java.io.InputStream
 
@@ -7,7 +8,8 @@ class ReaderPage(
         index: Int,
         url: String = "",
         imageUrl: String? = null,
-        var stream: (() -> InputStream)? = null
+        var stream: (() -> InputStream)? = null,
+        var bg: Drawable? = null
 ) : Page(index, url, imageUrl, null) {
 
     lateinit var chapter: ReaderChapter

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

@@ -244,9 +244,14 @@ class PagerPageHolder(
             .doOnNext { isAnimated ->
                 if (!isAnimated) {
                     if (viewer.config.readerTheme == 2) {
-                        val bytesArray = openStream!!.readBytes()
-
                         val imageView = initSubsamplingImageView()
+                        if (page.bg != null) {
+                            imageView.setImage(ImageSource.inputStream(openStream!!))
+                            imageView.background = page.bg
+                        }
+                        // if the user switches to automatic when pages are already cached, the bg needs to be loaded
+                        else {
+                            val bytesArray = openStream!!.readBytes()
                             val bytesStream = bytesArray.inputStream()
                             imageView.setImage(ImageSource.inputStream(bytesStream))
                             bytesStream.close()
@@ -254,6 +259,8 @@ class PagerPageHolder(
                             launchUI {
                                 val image = async { BitmapFactory.decodeByteArray(bytesArray, 0, bytesArray.size) }
                                 imageView.background = ImageUtil.autoSetBackground(image.await())
+                                page.bg = imageView.background
+                            }
                         }
                     }
                     else {

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

@@ -98,7 +98,7 @@ object ImageUtil {
 
         var overallWhitePixels = 0
         var overallBlackPixels = 0
-        outer@ for (x in intArrayOf(left, left - offsetX, right, right + offsetX)) {
+        outer@ for (x in intArrayOf(left, right, left - offsetX, right + offsetX)) {
             var whitePixelsStreak = 0
             var whitePixels = 0
             var blackPixelsStreak = 0