Add an option to reencode images under the advanced tab. #262

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

@@ -7,7 +7,7 @@ import com.google.gson.reflect.TypeToken
 import com.jakewharton.disklrucache.DiskLruCache
 import eu.kanade.tachiyomi.data.source.model.Page
 import eu.kanade.tachiyomi.util.DiskUtils
-import eu.kanade.tachiyomi.util.saveTo
+import eu.kanade.tachiyomi.util.saveImageTo
 import okhttp3.Response
 import okio.Okio
 import rx.Observable
@@ -185,7 +185,7 @@ class ChapterCache(private val context: Context) {
      * @throws IOException image error.
      */
     @Throws(IOException::class)
-    fun putImageToCache(imageUrl: String, response: Response) {
+    fun putImageToCache(imageUrl: String, response: Response, reencode: Boolean) {
         // Initialize editor (edits the values for an entry).
         var editor: DiskLruCache.Editor? = null
 
@@ -195,12 +195,10 @@ class ChapterCache(private val context: Context) {
             editor = diskCache.edit(key) ?: throw IOException("Unable to edit key")
 
             // Get OutputStream and write image with Okio.
-            response.body().source().saveTo(editor.newOutputStream(0))
+            response.body().source().saveImageTo(editor.newOutputStream(0), reencode)
 
             diskCache.flush()
             editor.commit()
-        } catch (e: Exception) {
-            throw IOException("Unable to save image")
         } finally {
             response.body().close()
             editor?.abortUnlessCommitted()

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

@@ -228,7 +228,14 @@ class DownloadManager(private val context: Context, private val sourceManager: S
         page.status = Page.DOWNLOAD_IMAGE
         return source.getImageProgressResponse(page)
                 .flatMap {
-                    it.body().source().saveTo(File(directory, filename))
+                    try {
+                        val file = File(directory, filename)
+                        file.parentFile.mkdirs()
+                        it.body().source().saveImageTo(file.outputStream(), preferences.reencodeImage())
+                    } catch (e: Exception) {
+                        it.body().close()
+                        throw e
+                    }
                     Observable.just(page)
                 }
                 .retry(2)

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

@@ -38,6 +38,8 @@ class PreferenceKeys(context: Context) {
 
     val readWithVolumeKeys = context.getString(R.string.pref_read_with_volume_keys_key)
 
+    val reencodeImage = context.getString(R.string.pref_reencode_key)
+
     val portraitColumns = context.getString(R.string.pref_library_columns_portrait_key)
 
     val landscapeColumns = context.getString(R.string.pref_library_columns_landscape_key)

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

@@ -78,6 +78,8 @@ class PreferencesHelper(private val context: Context) {
 
     fun readWithVolumeKeys() = rxPrefs.getBoolean(keys.readWithVolumeKeys, false)
 
+    fun reencodeImage() = prefs.getBoolean(keys.reencodeImage, false)
+
     fun portraitColumns() = rxPrefs.getInteger(keys.portraitColumns, 0)
 
     fun landscapeColumns() = rxPrefs.getInteger(keys.landscapeColumns, 0)

app/src/main/java/eu/kanade/tachiyomi/data/source/base/Source.kt

@@ -181,7 +181,7 @@ abstract class Source(context: Context) : BaseSource() {
         page.status = Page.DOWNLOAD_IMAGE
         return getImageProgressResponse(page)
                 .flatMap { resp ->
-                    chapterCache.putImageToCache(page.imageUrl, resp)
+                    chapterCache.putImageToCache(page.imageUrl, resp, prefs.reencodeImage())
                     Observable.just(page)
                 }
     }

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

@@ -1,5 +1,7 @@
 package eu.kanade.tachiyomi.util
 
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
 import okio.BufferedSource
 import okio.Okio
 import java.io.File
@@ -37,3 +39,24 @@ fun BufferedSource.saveTo(stream: OutputStream) {
         }
     }
 }
+
+/**
+ * Saves the given source to an output stream and closes both resources.
+ * The source is expected to be an image, and it may reencode the image.
+ *
+ * @param stream the stream where the source is copied.
+ * @param reencode whether to reencode the image or not.
+ */
+fun BufferedSource.saveImageTo(stream: OutputStream, reencode: Boolean = false) {
+    if (reencode) {
+        use {
+            val bitmap = BitmapFactory.decodeStream(it.inputStream())
+            stream.use {
+                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, it)
+            }
+            bitmap.recycle()
+        }
+    } else {
+        saveTo(stream)
+    }
+}

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

@@ -33,6 +33,7 @@
     <string name="pref_seamless_mode_key">pref_seamless_mode_key</string>
     <string name="pref_read_with_volume_keys_key">reader_volume_keys</string>
     <string name="pref_read_with_tapping_key">reader_tap</string>
+    <string name="pref_reencode_key">reencode_image</string>
     <string name="pref_filter_downloaded_key">pref_filter_downloaded_key</string>
     <string name="pref_filter_unread_key">pref_filter_unread_key</string>
 

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

@@ -158,6 +158,10 @@
     <string name="pref_clear_database">Clear database</string>
     <string name="pref_clear_database_summary">Delete manga and chapters that are not in your library</string>
     <string name="clear_database_confirmation">Are you sure? Read chapters and progress of non-library manga will be lost</string>
+    <string name="pref_show_warning_message">Show warnings</string>
+    <string name="pref_show_warning_message_summary">Show warning messages during library sync </string>
+    <string name="pref_reencode">Reencode images</string>
+    <string name="pref_reencode_summary">Enable reencoding if images can\'t be decoded. Expect best results with Skia</string>
 
       <!-- About section -->
     <string name="version">Version</string>

app/src/main/res/xml/pref_advanced.xml

@@ -11,4 +11,10 @@
         android:key="@string/pref_clear_database_key"
         android:summary="@string/pref_clear_database_summary"/>
 
+    <SwitchPreferenceCompat
+        android:defaultValue="false"
+        android:key="@string/pref_reencode_key"
+        android:summary="@string/pref_reencode_summary"
+        android:title="@string/pref_reencode"/>
+
 </android.support.v7.preference.PreferenceScreen>