Several reader fixes

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

@@ -22,6 +22,7 @@ import eu.kanade.tachiyomi.ui.base.activity.BaseRxActivity
 import eu.kanade.tachiyomi.ui.reader.ReaderPresenter.SetAsCoverResult.AddToLibraryFirst
 import eu.kanade.tachiyomi.ui.reader.ReaderPresenter.SetAsCoverResult.Error
 import eu.kanade.tachiyomi.ui.reader.ReaderPresenter.SetAsCoverResult.Success
+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.BaseViewer
@@ -429,20 +430,11 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>() {
     }
 
     /**
-     * Called from the viewer when the next chapter should be preloaded. It should be called when
-     * the viewer is reaching the end of the chapter or the transition page is active.
+     * Called from the viewer when the given [chapter] should be preloaded. It should be called when
+     * the viewer is reaching the beginning or end of a chapter or the transition page is active.
      */
-    fun requestPreloadNextChapter() {
-        presenter.preloadNextChapter()
-    }
-
-    /**
-     * Called from the viewer when the previous chapter should be preloaded. It should be called
-     * when the viewer is going backwards and reaching the beginning of the chapter or the
-     * transition page is active.
-     */
-    fun requestPreloadPreviousChapter() {
-        presenter.preloadPreviousChapter()
+    fun requestPreloadChapter(chapter: ReaderChapter) {
+        presenter.preloadChapter(chapter)
     }
 
     /**

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

@@ -43,7 +43,7 @@ class ReaderPresenter(
         private val sourceManager: SourceManager = Injekt.get(),
         private val downloadManager: DownloadManager = Injekt.get(),
         private val coverCache: CoverCache = Injekt.get(),
-        val preferences: PreferencesHelper = Injekt.get()
+        private val preferences: PreferencesHelper = Injekt.get()
 ) : BasePresenter<ReaderActivity>() {
 
     /**
@@ -331,19 +331,10 @@ class ReaderPresenter(
     }
 
     /**
-     * Called from the activity to preload the next chapter.
+     * Called from the activity to preload the given [chapter].
      */
-    fun preloadNextChapter() {
-        val nextChapter = viewerChaptersRelay.value?.nextChapter ?: return
-        preload(nextChapter)
-    }
-
-    /**
-     * Called from the activity to preload the previous chapter.
-     */
-    fun preloadPreviousChapter() {
-        val prevChapter = viewerChaptersRelay.value?.prevChapter ?: return
-        preload(prevChapter)
+    fun preloadChapter(chapter: ReaderChapter) {
+        preload(chapter)
     }
 
     /**

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

@@ -62,8 +62,12 @@ class HttpPageLoader(
         // Cache current page list progress for online chapters to allow a faster reopen
         val pages = chapter.pages
         if (pages != null) {
-            // TODO check compatibility with ReaderPage
-            Completable.fromAction { chapterCache.putPageListToCache(chapter.chapter, pages) }
+            Completable
+                .fromAction {
+                    // Convert to pages without reader information
+                    val pagesToSave = pages.map { Page(it.index, it.url, it.imageUrl) }
+                    chapterCache.putPageListToCache(chapter.chapter, pagesToSave)
+                }
                 .onErrorComplete()
                 .subscribeOn(Schedulers.io())
                 .subscribe()

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

@@ -2,7 +2,6 @@ package eu.kanade.tachiyomi.ui.reader.model
 
 import com.jakewharton.rxrelay.BehaviorRelay
 import eu.kanade.tachiyomi.data.database.models.Chapter
-import eu.kanade.tachiyomi.ui.reader.loader.DownloadPageLoader
 import eu.kanade.tachiyomi.ui.reader.loader.PageLoader
 import timber.log.Timber
 
@@ -26,10 +25,6 @@ data class ReaderChapter(val chapter: Chapter) {
 
     var requestedPage: Int = 0
 
-    val isDownloaded
-        get() = pageLoader is DownloadPageLoader
-
-
     var references = 0
         private set
 

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

@@ -168,10 +168,9 @@ class PagerTransitionHolder(
             wrapContent()
             setText(R.string.action_retry)
             setOnClickListener {
-                if (transition is ChapterTransition.Next) {
-                    viewer.activity.requestPreloadNextChapter()
-                } else {
-                    viewer.activity.requestPreloadPreviousChapter()
+                val toChapter = transition.to
+                if (toChapter != null) {
+                    viewer.activity.requestPreloadChapter(toChapter)
                 }
             }
         }

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

@@ -74,7 +74,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
                 if (page != null && currentPage != page) {
                     currentPage = page
                     when (page) {
-                        is ReaderPage -> onPageSelected(page)
+                        is ReaderPage -> onPageSelected(page, position)
                         is ChapterTransition -> onTransitionSelected(page)
                     }
                 }
@@ -128,14 +128,17 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
      * Called from the ViewPager 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) {
+    private fun onPageSelected(page: ReaderPage, position: Int) {
         val pages = page.chapter.pages!! // Won't be null because it's the loaded chapter
         Timber.d("onPageSelected: ${page.number}/${pages.size}")
         activity.onPageSelected(page)
 
         if (page === pages.last()) {
             Timber.d("Request preload next chapter because we're at the last page")
-            activity.requestPreloadNextChapter()
+            val transition = adapter.items.getOrNull(position + 1) as? ChapterTransition.Next
+            if (transition?.to != null) {
+                activity.requestPreloadChapter(transition.to)
+            }
         }
     }
 
@@ -145,15 +148,10 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
      */
     private fun onTransitionSelected(transition: ChapterTransition) {
         Timber.d("onTransitionSelected: $transition")
-        when (transition) {
-            is ChapterTransition.Prev -> {
-                Timber.d("Request preload previous chapter because we're on the transition")
-                activity.requestPreloadPreviousChapter()
-            }
-            is ChapterTransition.Next -> {
-                Timber.d("Request preload next chapter because we're on the transition")
-                activity.requestPreloadNextChapter()
-            }
+        val toChapter = transition.to
+        if (toChapter != null) {
+            Timber.d("Request preload destination chapter because we're on the transition")
+            activity.requestPreloadChapter(toChapter)
         }
     }
 

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

@@ -180,10 +180,9 @@ class WebtoonTransitionHolder(
             wrapContent()
             setText(R.string.action_retry)
             setOnClickListener {
-                if (transition is ChapterTransition.Next) {
-                    viewer.activity.requestPreloadNextChapter()
-                } else {
-                    viewer.activity.requestPreloadPreviousChapter()
+                val toChapter = transition.to
+                if (toChapter != null) {
+                    viewer.activity.requestPreloadChapter(toChapter)
                 }
             }
         }

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

@@ -68,12 +68,12 @@ class WebtoonViewer(val activity: ReaderActivity) : BaseViewer {
         recycler.adapter = adapter
         recycler.addOnScrollListener(object : RecyclerView.OnScrollListener() {
             override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
-                val index = layoutManager.findLastEndVisibleItemPosition()
-                val item = adapter.items.getOrNull(index)
+                val position = layoutManager.findLastEndVisibleItemPosition()
+                val item = adapter.items.getOrNull(position)
                 if (item != null && currentPage != item) {
                     currentPage = item
                     when (item) {
-                        is ReaderPage -> onPageSelected(item)
+                        is ReaderPage -> onPageSelected(item, position)
                         is ChapterTransition -> onTransitionSelected(item)
                     }
                 }
@@ -81,8 +81,8 @@ class WebtoonViewer(val activity: ReaderActivity) : BaseViewer {
                 if (dy < 0) {
                     val firstIndex = layoutManager.findFirstVisibleItemPosition()
                     val firstItem = adapter.items.getOrNull(firstIndex)
-                    if (firstItem is ChapterTransition.Prev) {
-                        activity.requestPreloadPreviousChapter()
+                    if (firstItem is ChapterTransition.Prev && firstItem.to != null) {
+                        activity.requestPreloadChapter(firstItem.to)
                     }
                 }
             }
@@ -125,29 +125,33 @@ class WebtoonViewer(val activity: ReaderActivity) : BaseViewer {
     }
 
     /**
-     * Called from the ViewPager listener when a [page] is marked as active. It notifies the
+     * 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) {
+    private fun onPageSelected(page: ReaderPage, position: Int) {
         val pages = page.chapter.pages!! // Won't be null because it's the loaded chapter
         Timber.d("onPageSelected: ${page.number}/${pages.size}")
         activity.onPageSelected(page)
 
         if (page === pages.last()) {
             Timber.d("Request preload next chapter because we're at the last page")
-            activity.requestPreloadNextChapter()
+            val transition = adapter.items.getOrNull(position + 1) as? ChapterTransition.Next
+            if (transition?.to != null) {
+                activity.requestPreloadChapter(transition.to)
+            }
         }
     }
 
     /**
-     * Called from the ViewPager listener when a [transition] is marked as active. It request the
+     * 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) {
         Timber.d("onTransitionSelected: $transition")
-        if (transition is ChapterTransition.Prev) {
-            Timber.d("Request preload previous chapter because we're on the transition")
-            activity.requestPreloadPreviousChapter()
+        val toChapter = transition.to
+        if (toChapter != null) {
+            Timber.d("Request preload destination chapter because we're on the transition")
+            activity.requestPreloadChapter(toChapter)
         }
     }
 

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

@@ -6,16 +6,12 @@ import java.net.URLConnection
 object ImageUtil {
 
     fun isImage(name: String, openStream: (() -> InputStream)? = null): Boolean {
-        try {
-            val guessedMime = URLConnection.guessContentTypeFromName(name)
-            if (guessedMime.startsWith("image/")) {
-                return true
-            }
+        val contentType = try {
+            URLConnection.guessContentTypeFromName(name)
         } catch (e: Exception) {
-            /* Ignore error */
-        }
-
-        return openStream?.let { findImageType(it) } != null
+            null
+        } ?: openStream?.let { findImageType(it)?.mime }
+        return contentType?.startsWith("image/") ?: false
     }
 
     fun findImageType(openStream: () -> InputStream): ImageType? {