Add Rapid decoder for better image support. Reorganize readers.

app/build.gradle

@@ -113,6 +113,9 @@ dependencies {
     compile 'eu.davidea:flexible-adapter:4.2.0@aar'
     compile 'com.nononsenseapps:filepicker:2.5.0'
     compile 'com.amulyakhare:com.amulyakhare.textdrawable:1.0.1'
+    compile 'rapid.decoder:library:0.3.0'
+    compile 'rapid.decoder:jpeg-decoder:0.3.0'
+    compile 'rapid.decoder:png-decoder:0.3.0'
 
     compile "com.google.dagger:dagger:$DAGGER_VERSION"
     apt "com.google.dagger:dagger-compiler:$DAGGER_VERSION"

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

@@ -84,11 +84,8 @@ public class PreferencesHelper {
         return rxPrefs.getFloat(getKey(R.string.pref_custom_brightness_value_key), 0F);
     }
 
-    public int getReaderTheme() {
-        return prefs.getInt(getKey(R.string.pref_reader_theme_key), 0);
-    }
-
     public int getDefaultViewer() {
+        // TODO use IntListPreference
         return Integer.parseInt(prefs.getString(getKey(R.string.pref_default_viewer_key), "1"));
     }
 
@@ -100,6 +97,14 @@ public class PreferencesHelper {
         return rxPrefs.getInteger(getKey(R.string.pref_library_columns_landscape_key), 0);
     }
 
+    public Preference<Integer> imageDecoder() {
+        return rxPrefs.getInteger(getKey(R.string.pref_image_decoder_key), 0);
+    }
+
+    public Preference<Integer> readerTheme() {
+        return rxPrefs.getInteger(getKey(R.string.pref_reader_theme_key), 0);
+    }
+
     public String getSourceUsername(Source source) {
         return prefs.getString(SOURCE_ACCOUNT_USERNAME + source.getId(), "");
     }

app/src/main/java/eu/kanade/mangafeed/ui/reader/ReaderActivity.java

@@ -30,9 +30,9 @@ import eu.kanade.mangafeed.data.preference.PreferencesHelper;
 import eu.kanade.mangafeed.data.source.model.Page;
 import eu.kanade.mangafeed.ui.base.activity.BaseRxActivity;
 import eu.kanade.mangafeed.ui.reader.viewer.base.BaseReader;
-import eu.kanade.mangafeed.ui.reader.viewer.horizontal.LeftToRightReader;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.horizontal.LeftToRightReader;
-import eu.kanade.mangafeed.ui.reader.viewer.horizontal.RightToLeftReader;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.horizontal.RightToLeftReader;
-import eu.kanade.mangafeed.ui.reader.viewer.vertical.VerticalReader;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.vertical.VerticalReader;
 import eu.kanade.mangafeed.ui.reader.viewer.webtoon.WebtoonReader;
 import eu.kanade.mangafeed.util.GLUtil;
 import eu.kanade.mangafeed.util.ToastUtil;
@@ -85,9 +85,6 @@ public class ReaderActivity extends BaseRxActivity<ReaderPresenter> {
         if (savedState != null && readerMenu.showing)
             readerMenu.show(false);
 
-        readerTheme = preferences.getReaderTheme();
-        applyTheme();
-
         initializeSettings();
 
         maxBitmapSize = GLUtil.getMaxTextureSize();
@@ -211,6 +208,11 @@ public class ReaderActivity extends BaseRxActivity<ReaderPresenter> {
         subscriptions.add(preferences.customBrightness()
                 .asObservable()
                 .subscribe(this::setCustomBrightness));
+
+        subscriptions.add(preferences.readerTheme()
+                .asObservable()
+                .distinctUntilChanged()
+                .subscribe(this::applyTheme));
     }
 
     private void setOrientation(boolean locked) {
@@ -291,14 +293,17 @@ public class ReaderActivity extends BaseRxActivity<ReaderPresenter> {
         recreate();
     }
 
-    private void applyTheme() {
+    private void applyTheme(int theme) {
+        readerTheme = theme;
         View rootView = getWindow().getDecorView().getRootView();
-        if (readerTheme == BLACK_THEME) {
+        if (theme == BLACK_THEME) {
             rootView.setBackgroundColor(Color.BLACK);
             pageNumber.setTextColor(ContextCompat.getColor(this, R.color.light_grey));
             pageNumber.setBackgroundColor(ContextCompat.getColor(this, R.color.page_number_background_black));
         } else {
             rootView.setBackgroundColor(Color.WHITE);
+            pageNumber.setTextColor(ContextCompat.getColor(this, R.color.primary_text));
+            pageNumber.setBackgroundColor(ContextCompat.getColor(this, R.color.page_number_background));
         }
     }
 

app/src/main/java/eu/kanade/mangafeed/ui/reader/ReaderMenu.java

@@ -2,7 +2,6 @@ package eu.kanade.mangafeed.ui.reader;
 
 import android.app.Dialog;
 import android.content.Context;
-import android.support.v7.app.AlertDialog;
 import android.support.v7.widget.Toolbar;
 import android.view.Gravity;
 import android.view.Menu;
@@ -20,6 +19,8 @@ import android.widget.RelativeLayout;
 import android.widget.SeekBar;
 import android.widget.TextView;
 
+import com.afollestad.materialdialogs.MaterialDialog;
+
 import java.text.DecimalFormat;
 
 import butterknife.Bind;
@@ -191,15 +192,14 @@ public class ReaderMenu {
         // Reader selector
         readerSelector.setOnClickListener(v -> {
             final Manga manga = activity.getPresenter().getManga();
-            final Dialog dialog = new AlertDialog.Builder(activity)
+            showImmersiveDialog(new MaterialDialog.Builder(activity)
-                    .setSingleChoiceItems(R.array.viewers_selector, manga.viewer, (d, which) -> {
+                    .items(R.array.viewers_selector)
-                        if (manga.viewer != which) {
+                    .itemsCallbackSingleChoice(manga.viewer,
-                            activity.setMangaDefaultViewer(which);
+                            (d, itemView, which, text) -> {
-                        }
+                                activity.setMangaDefaultViewer(which);
-                        d.dismiss();
+                                return true;
-                    })
+                            })
-                    .create();
+                    .build());
-            showImmersiveDialog(dialog);
         });
 
         // Extra settings menu
@@ -245,6 +245,8 @@ public class ReaderMenu {
         @Bind(R.id.show_page_number) CheckBox showPageNumber;
         @Bind(R.id.hide_status_bar) CheckBox hideStatusBar;
         @Bind(R.id.keep_screen_on) CheckBox keepScreenOn;
+        @Bind(R.id.image_decoder) TextView imageDecoder;
+        @Bind(R.id.reader_theme) TextView readerTheme;
 
         public SettingsPopupWindow(View view) {
             super(view, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
@@ -272,6 +274,30 @@ public class ReaderMenu {
 
             keepScreenOn.setOnCheckedChangeListener((view, isChecked) ->
                     preferences.keepScreenOn().set(isChecked));
+
+            imageDecoder.setOnClickListener(v -> {
+                showImmersiveDialog(new MaterialDialog.Builder(activity)
+                        .title(R.string.pref_image_decoder)
+                        .items(R.array.image_decoders)
+                        .itemsCallbackSingleChoice(preferences.imageDecoder().get(),
+                                (dialog, itemView, which, text) -> {
+                                    preferences.imageDecoder().set(which);
+                                    return true;
+                                })
+                        .build());
+            });
+
+            readerTheme.setOnClickListener(v -> {
+                showImmersiveDialog(new MaterialDialog.Builder(activity)
+                        .title(R.string.pref_reader_theme)
+                        .items(R.array.reader_themes)
+                        .itemsCallbackSingleChoice(preferences.readerTheme().get(),
+                                (dialog, itemView, which, text) -> {
+                                    preferences.readerTheme().set(which);
+                                    return true;
+                                })
+                        .build());
+            });
         }
 
     }

app/src/main/java/eu/kanade/mangafeed/ui/reader/decoder/RapidImageRegionDecoder.java

@@ -0,0 +1,53 @@
+package eu.kanade.mangafeed.ui.reader.decoder;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.net.Uri;
+
+import com.davemorrissey.labs.subscaleview.decoder.ImageRegionDecoder;
+
+import rapid.decoder.BitmapDecoder;
+
+/**
+ * A very simple implementation of {@link com.davemorrissey.labs.subscaleview.decoder.ImageRegionDecoder}
+ * using the RapidDecoder library (https://github.com/suckgamony/RapidDecoder). For PNGs, this can
+ * give more reliable decoding and better performance. For JPGs, it is slower and can run out of
+ * memory with large images, but has better support for grayscale and CMYK images.
+ *
+ * This is an incomplete and untested implementation provided as an example only.
+ */
+public class RapidImageRegionDecoder implements ImageRegionDecoder {
+
+    private BitmapDecoder decoder;
+
+    @Override
+    public Point init(Context context, Uri uri) throws Exception {
+        decoder = BitmapDecoder.from(context, uri);
+        decoder.useBuiltInDecoder(true);
+        return new Point(decoder.sourceWidth(), decoder.sourceHeight());
+    }
+
+    @Override
+    public synchronized Bitmap decodeRegion(Rect sRect, int sampleSize) {
+        try {
+            return decoder.reset().region(sRect).scale(sRect.width()/sampleSize, sRect.height()/sampleSize).decode();
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    @Override
+    public boolean isReady() {
+        return decoder != null;
+    }
+
+    @Override
+    public void recycle() {
+        BitmapDecoder.destroyMemoryCache();
+        BitmapDecoder.destroyDiskCache();
+        decoder.reset();
+        decoder = null;
+    }
+}

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/base/BaseReader.java

@@ -2,16 +2,24 @@ package eu.kanade.mangafeed.ui.reader.viewer.base;
 
 import android.view.MotionEvent;
 
+import com.davemorrissey.labs.subscaleview.decoder.ImageRegionDecoder;
+import com.davemorrissey.labs.subscaleview.decoder.SkiaImageRegionDecoder;
+
 import java.util.List;
 
 import eu.kanade.mangafeed.data.source.model.Page;
 import eu.kanade.mangafeed.ui.base.fragment.BaseFragment;
 import eu.kanade.mangafeed.ui.reader.ReaderActivity;
+import eu.kanade.mangafeed.ui.reader.decoder.RapidImageRegionDecoder;
 
 public abstract class BaseReader extends BaseFragment {
 
     protected int currentPage;
     protected List<Page> pages;
+    protected Class<? extends ImageRegionDecoder> regionDecoderClass;
+
+    public static final int RAPID_DECODER = 0;
+    public static final int SKIA_DECODER = 1;
 
     public void updatePageNumber() {
         getReaderActivity().onPageChanged(getCurrentPage(), getTotalPages());
@@ -42,6 +50,22 @@ public abstract class BaseReader extends BaseFragment {
     public abstract void onPageListReady(List<Page> pages, int currentPage);
     public abstract boolean onImageTouch(MotionEvent motionEvent);
 
+    public void setRegionDecoderClass(int value) {
+        switch (value) {
+            case RAPID_DECODER:
+            default:
+                regionDecoderClass = RapidImageRegionDecoder.class;
+                break;
+            case SKIA_DECODER:
+                regionDecoderClass = SkiaImageRegionDecoder.class;
+                break;
+        }
+    }
+
+    public Class<? extends ImageRegionDecoder> getRegionDecoderClass() {
+        return regionDecoderClass;
+    }
+
     public ReaderActivity getReaderActivity() {
         return (ReaderActivity) getActivity();
     }

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/base/OnChapterBoundariesOutListener.java

@@ -1,4 +1,4 @@
-package eu.kanade.mangafeed.ui.reader.viewer.common;
+package eu.kanade.mangafeed.ui.reader.viewer.base;
 
 public interface OnChapterBoundariesOutListener {
     void onFirstPageOutEvent();

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/base/OnChapterSingleTapListener.java

@@ -1,4 +1,4 @@
-package eu.kanade.mangafeed.ui.reader.viewer.common;
+package eu.kanade.mangafeed.ui.reader.viewer.base;
 
 public interface OnChapterSingleTapListener {
     void onCenterTap();

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/Pager.java

@@ -1,9 +1,11 @@
-package eu.kanade.mangafeed.ui.reader.viewer.common;
+package eu.kanade.mangafeed.ui.reader.viewer.pager;
 
 import android.support.v4.view.PagerAdapter;
 import android.view.MotionEvent;
 import android.view.ViewGroup;
 
+import eu.kanade.mangafeed.ui.reader.viewer.base.OnChapterBoundariesOutListener;
+import eu.kanade.mangafeed.ui.reader.viewer.base.OnChapterSingleTapListener;
 import rx.functions.Action1;
 
 public interface Pager {

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/PagerGestureListener.java

@@ -1,4 +1,4 @@
-package eu.kanade.mangafeed.ui.reader.viewer.common;
+package eu.kanade.mangafeed.ui.reader.viewer.pager;
 
 import android.view.GestureDetector;
 import android.view.MotionEvent;

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/PagerReader.java

@@ -1,4 +1,4 @@
-package eu.kanade.mangafeed.ui.reader.viewer.common;
+package eu.kanade.mangafeed.ui.reader.viewer.pager;
 
 import android.view.MotionEvent;
 import android.view.ViewGroup;
@@ -8,7 +8,9 @@ import java.util.List;
 import eu.kanade.mangafeed.R;
 import eu.kanade.mangafeed.data.source.model.Page;
 import eu.kanade.mangafeed.ui.reader.viewer.base.BaseReader;
-import rx.Subscription;
+import eu.kanade.mangafeed.ui.reader.viewer.base.OnChapterBoundariesOutListener;
+import eu.kanade.mangafeed.ui.reader.viewer.base.OnChapterSingleTapListener;
+import rx.subscriptions.CompositeSubscription;
 
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 
@@ -18,7 +20,7 @@ public abstract class PagerReader extends BaseReader {
     protected Pager pager;
 
     protected boolean transitions;
-    protected Subscription transitionsSubscription;
+    protected CompositeSubscription subscriptions;
 
     protected void initializePager(Pager pager) {
         this.pager = pager;
@@ -55,16 +57,25 @@ public abstract class PagerReader extends BaseReader {
 
         adapter = new PagerReaderAdapter(getChildFragmentManager());
         pager.setAdapter(adapter);
-        setPages();
 
-        transitionsSubscription = getReaderActivity().getPreferences().enableTransitions()
+        subscriptions = new CompositeSubscription();
+        subscriptions.add(getReaderActivity().getPreferences().imageDecoder()
                 .asObservable()
-                .subscribe(value -> transitions = value);
+                .doOnNext(this::setRegionDecoderClass)
+                .skip(1)
+                .distinctUntilChanged()
+                .subscribe(v -> adapter.notifyDataSetChanged()));
+
+        subscriptions.add(getReaderActivity().getPreferences().enableTransitions()
+                .asObservable()
+                .subscribe(value -> transitions = value));
+
+        setPages();
     }
 
     @Override
     public void onDestroyView() {
-        transitionsSubscription.unsubscribe();
+        subscriptions.unsubscribe();
         super.onDestroyView();
     }
 

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/PagerReaderAdapter.java

@@ -1,4 +1,4 @@
-package eu.kanade.mangafeed.ui.reader.viewer.common;
+package eu.kanade.mangafeed.ui.reader.viewer.pager;
 
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/PagerReaderFragment.java

@@ -1,4 +1,4 @@
-package eu.kanade.mangafeed.ui.reader.viewer.common;
+package eu.kanade.mangafeed.ui.reader.viewer.pager;
 
 import android.os.Bundle;
 import android.support.annotation.Nullable;
@@ -54,6 +54,7 @@ public class PagerReaderFragment extends BaseFragment {
         View view = inflater.inflate(R.layout.item_pager_reader, container, false);
         ButterKnife.bind(this, view);
         ReaderActivity activity = (ReaderActivity) getActivity();
+        BaseReader parentFragment = (BaseReader) getParentFragment();
 
         if (activity.getReaderTheme() == ReaderActivity.BLACK_THEME) {
              progressText.setTextColor(ContextCompat.getColor(getContext(), R.color.light_grey));
@@ -64,8 +65,8 @@ public class PagerReaderFragment extends BaseFragment {
         imageView.setDoubleTapZoomStyle(SubsamplingScaleImageView.ZOOM_FOCUS_FIXED);
         imageView.setPanLimit(SubsamplingScaleImageView.PAN_LIMIT_INSIDE);
         imageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_INSIDE);
-        imageView.setOnTouchListener((v, motionEvent) ->
+        imageView.setRegionDecoderClass(parentFragment.getRegionDecoderClass());
-                ((BaseReader) getParentFragment()).onImageTouch(motionEvent));
+        imageView.setOnTouchListener((v, motionEvent) -> parentFragment.onImageTouch(motionEvent));
 
         retryButton.setOnTouchListener((v, event) -> {
             if (event.getAction() == MotionEvent.ACTION_UP) {
@@ -76,25 +77,16 @@ public class PagerReaderFragment extends BaseFragment {
             return true;
         });
 
+        observeStatus();
         return view;
     }
 
     @Override
     public void onDestroyView() {
-        ButterKnife.unbind(this);
-        super.onDestroyView();
-    }
-
-    public void onStart() {
-        super.onStart();
-        observeStatus();
-    }
-
-    @Override
-    public void onStop() {
         unsubscribeProgress();
         unsubscribeStatus();
-        super.onStop();
+        ButterKnife.unbind(this);
+        super.onDestroyView();
     }
 
     public void setPage(Page page) {

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/horizontal/HorizontalPager.java

@@ -1,4 +1,4 @@
-package eu.kanade.mangafeed.ui.reader.viewer.horizontal;
+package eu.kanade.mangafeed.ui.reader.viewer.pager.horizontal;
 
 import android.content.Context;
 import android.support.v4.view.ViewPager;
@@ -6,10 +6,10 @@ import android.util.AttributeSet;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 
-import eu.kanade.mangafeed.ui.reader.viewer.common.OnChapterBoundariesOutListener;
+import eu.kanade.mangafeed.ui.reader.viewer.base.OnChapterBoundariesOutListener;
-import eu.kanade.mangafeed.ui.reader.viewer.common.OnChapterSingleTapListener;
+import eu.kanade.mangafeed.ui.reader.viewer.base.OnChapterSingleTapListener;
-import eu.kanade.mangafeed.ui.reader.viewer.common.PagerGestureListener;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.PagerGestureListener;
-import eu.kanade.mangafeed.ui.reader.viewer.common.Pager;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.Pager;
 import rx.functions.Action1;
 
 public class HorizontalPager extends ViewPager implements Pager {

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/horizontal/HorizontalReader.java

@@ -1,11 +1,11 @@
-package eu.kanade.mangafeed.ui.reader.viewer.horizontal;
+package eu.kanade.mangafeed.ui.reader.viewer.pager.horizontal;
 
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import eu.kanade.mangafeed.ui.reader.viewer.common.PagerReader;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.PagerReader;
 
 public abstract class HorizontalReader extends PagerReader {
 

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/horizontal/LeftToRightReader.java

@@ -1,4 +1,4 @@
-package eu.kanade.mangafeed.ui.reader.viewer.horizontal;
+package eu.kanade.mangafeed.ui.reader.viewer.pager.horizontal;
 
 public class LeftToRightReader extends HorizontalReader {
 

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/horizontal/RightToLeftReader.java

@@ -1,10 +1,11 @@
-package eu.kanade.mangafeed.ui.reader.viewer.horizontal;
+package eu.kanade.mangafeed.ui.reader.viewer.pager.horizontal;
 
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
 import eu.kanade.mangafeed.data.source.model.Page;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.horizontal.HorizontalReader;
 
 public class RightToLeftReader extends HorizontalReader {
 

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/vertical/VerticalPager.java

@@ -1,14 +1,14 @@
-package eu.kanade.mangafeed.ui.reader.viewer.vertical;
+package eu.kanade.mangafeed.ui.reader.viewer.pager.vertical;
 
 import android.content.Context;
 import android.util.AttributeSet;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 
-import eu.kanade.mangafeed.ui.reader.viewer.common.OnChapterBoundariesOutListener;
+import eu.kanade.mangafeed.ui.reader.viewer.base.OnChapterBoundariesOutListener;
-import eu.kanade.mangafeed.ui.reader.viewer.common.OnChapterSingleTapListener;
+import eu.kanade.mangafeed.ui.reader.viewer.base.OnChapterSingleTapListener;
-import eu.kanade.mangafeed.ui.reader.viewer.common.PagerGestureListener;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.PagerGestureListener;
-import eu.kanade.mangafeed.ui.reader.viewer.common.Pager;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.Pager;
 import rx.functions.Action1;
 
 public class VerticalPager extends VerticalViewPagerImpl implements Pager {

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/vertical/VerticalReader.java

@@ -1,11 +1,12 @@
-package eu.kanade.mangafeed.ui.reader.viewer.vertical;
+package eu.kanade.mangafeed.ui.reader.viewer.pager.vertical;
 
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import eu.kanade.mangafeed.ui.reader.viewer.common.PagerReader;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.PagerReader;
+import eu.kanade.mangafeed.ui.reader.viewer.pager.vertical.VerticalPager;
 
 public class VerticalReader extends PagerReader {
 

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/pager/vertical/VerticalViewPagerImpl.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package eu.kanade.mangafeed.ui.reader.viewer.vertical;
+package eu.kanade.mangafeed.ui.reader.viewer.pager.vertical;
 
 import android.content.Context;
 import android.content.res.Resources;

app/src/main/res/layout/reader_brightness.xml

@@ -12,7 +12,7 @@
     <CheckBox
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        style="@style/grey_text"
+        style="@style/reader_menu_settings_item"
         android:text="@string/pref_custom_brightness"
         android:id="@+id/custom_brightness" />
 

app/src/main/res/layout/reader_popup.xml

@@ -8,32 +8,36 @@
     android:paddingTop="5dp"
     android:paddingBottom="5dp">
 
+    <TextView
+        android:id="@+id/reader_theme"
+        android:paddingLeft="32dp"
+        style="@style/reader_menu_settings_item"
+        android:text="@string/pref_reader_theme"/>
+
+    <TextView
+        android:id="@+id/image_decoder"
+        android:paddingLeft="32dp"
+        style="@style/reader_menu_settings_item"
+        android:text="@string/pref_image_decoder"/>
+
     <CheckBox
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
         android:id="@+id/enable_transitions"
-        style="@style/grey_text"
+        style="@style/reader_menu_settings_item"
         android:text="@string/pref_enable_transitions"/>
 
     <CheckBox
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
         android:id="@+id/show_page_number"
-        style="@style/grey_text"
+        style="@style/reader_menu_settings_item"
         android:text="@string/pref_show_page_number"/>
 
     <CheckBox
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
         android:id="@+id/hide_status_bar"
-        style="@style/grey_text"
+        style="@style/reader_menu_settings_item"
         android:text="@string/pref_hide_status_bar"/>
 
     <CheckBox
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
         android:id="@+id/keep_screen_on"
-        style="@style/grey_text"
+        style="@style/reader_menu_settings_item"
         android:text="@string/pref_keep_screen_on"/>
 
 </LinearLayout>

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

@@ -38,4 +38,14 @@
         <item>1</item>
     </string-array>
 
+    <string-array name="image_decoders">
+        <item>@string/rapid_decoder</item>
+        <item>@string/skia_decoder</item>
+    </string-array>
+
+    <string-array name="image_decoders_values">
+        <item>0</item>
+        <item>1</item>
+    </string-array>
+
 </resources>

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

@@ -20,6 +20,7 @@
     <string name="pref_custom_brightness_key">pref_custom_brightness_key</string>
     <string name="pref_custom_brightness_value_key">pref_custom_brightness_value_key</string>
     <string name="pref_reader_theme_key">pref_reader_theme_key</string>
+    <string name="pref_image_decoder_key">pref_image_decoder_key</string>
 
     <string name="pref_download_directory_key">pref_download_directory_key</string>
     <string name="pref_download_slots_key">pref_download_slots_key</string>

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

@@ -80,6 +80,9 @@
     <string name="right_to_left_viewer">Right to left</string>
     <string name="vertical_viewer">Vertical</string>
     <string name="webtoon_viewer">Webtoon (experimental)</string>
+    <string name="pref_image_decoder">Image decoder</string>
+    <string name="rapid_decoder">Rapid</string>
+    <string name="skia_decoder">Skia</string>
 
       <!-- Downloads section -->
     <string name="pref_download_directory">Downloads directory</string>

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

@@ -109,7 +109,10 @@
         <item name="android:windowExitAnimation">@anim/exit_to_left</item>
     </style>
 
-    <style name="grey_text">
+    <style name="reader_menu_settings_item">
         <item name="android:textColor">@color/md_grey_300</item>
+        <item name="android:layout_width">wrap_content</item>
+        <item name="android:layout_height">36dp</item>
+        <item name="android:gravity">center</item>
     </style>
 </resources>

app/src/main/res/xml/pref_reader.xml

@@ -36,4 +36,12 @@
         android:defaultValue="0"
         android:summary="%s"/>
 
+    <eu.kanade.mangafeed.ui.setting.preference.IntListPreference
+        android:title="@string/pref_image_decoder"
+        android:key="@string/pref_image_decoder_key"
+        android:entries="@array/image_decoders"
+        android:entryValues="@array/image_decoders_values"
+        android:defaultValue="0"
+        android:summary="%s" />
+
 </PreferenceScreen>

build.gradle

@@ -23,5 +23,6 @@ allprojects {
         maven { url "http://dl.bintray.com/davideas/maven" }
         maven { url "https://jitpack.io" }
         maven { url 'http://dl.bintray.com/amulyakhare/maven' }
+        maven { url 'https://github.com/suckgamony/RapidDecoder/raw/master/repository' }
     }
 }