Initial support for custom images scaling (#40)

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

@@ -328,7 +328,6 @@ public class DownloadManager {
 
     // Return the page list from the chapter's directory if it exists, null otherwise
     public List<Page> getSavedPageList(Source source, Manga manga, Chapter chapter) {
-        List<Page> pages = null;
         File chapterDir = getAbsoluteChapterDirectory(source, manga, chapter);
         File pagesFile = new File(chapterDir, PAGE_LIST_FILE);
 
@@ -337,14 +336,14 @@ public class DownloadManager {
             if (pagesFile.exists()) {
                 reader = new JsonReader(new FileReader(pagesFile.getAbsolutePath()));
                 Type collectionType = new TypeToken<List<Page>>() {}.getType();
-                pages = gson.fromJson(reader, collectionType);
+                return gson.fromJson(reader, collectionType);
             }
         } catch (Exception e) {
             Timber.e(e.getCause(), e.getMessage());
         } finally {
             if (reader != null) try { reader.close(); } catch (IOException e) { /* Do nothing */ }
         }
-        return pages;
+        return null;
     }
 
     // Shortcut for the method above

app/src/main/java/eu/kanade/tachiyomi/data/download/model/DownloadQueue.java

@@ -47,7 +47,7 @@ public class DownloadQueue extends ArrayList<Download> {
     }
 
     public Observable<Download> getProgressObservable() {
-        return statusSubject
+        return statusSubject.onBackpressureBuffer()
                 .startWith(getActiveDownloads())
                 .flatMap(download -> {
                     if (download.getStatus() == Download.DOWNLOADING) {

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

@@ -88,6 +88,10 @@ public class PreferencesHelper {
         return prefs.getInt(getKey(R.string.pref_default_viewer_key), 1);
     }
 
+    public Preference<Integer> imageScaleType() {
+        return rxPrefs.getInteger(getKey(R.string.pref_image_scale_type_key), 1);
+    }
+
     public Preference<Integer> portraitColumns() {
         return rxPrefs.getInteger(getKey(R.string.pref_library_columns_portrait_key), 0);
     }