Add crop borders functionality, #219

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

@@ -83,6 +83,11 @@ class ReaderSettingsDialog : DialogFragment() {
         fullscreen.setOnCheckedChangeListener { v, isChecked ->
             preferences.fullscreen().set(isChecked)
         }
+
+        crop_borders.isChecked = preferences.cropBorders().getOrDefault()
+        crop_borders.setOnCheckedChangeListener { v, isChecked ->
+            preferences.cropBorders().set(isChecked)
+        }
     }
 
     override fun onDestroyView() {

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

@@ -70,6 +70,7 @@ class PageView @JvmOverloads constructor(context: Context, attrs: AttributeSet?
             setRegionDecoderClass(reader.regionDecoderClass)
             setBitmapDecoderClass(reader.bitmapDecoderClass)
             setVerticalScrollingParent(reader is VerticalReader)
+            setCropBorders(reader.cropBorders)
             setOnTouchListener { v, motionEvent -> reader.gestureDetector.onTouchEvent(motionEvent) }
             setOnLongClickListener { reader.onLongClick(page) }
             setOnImageEventListener(object : SubsamplingScaleImageView.DefaultOnImageEventListener() {

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

@@ -79,6 +79,12 @@ abstract class PagerReader : BaseReader() {
     var transitions: Boolean = false
         private set
 
+    /**
+     * Whether to crop image borders.
+     */
+    var cropBorders: Boolean = false
+        private set
+
     /**
      * Scale type (fit width, fit screen, etc).
      */
@@ -150,9 +156,16 @@ abstract class PagerReader : BaseReader() {
                     .distinctUntilChanged()
                     .subscribe { refreshAdapter() })
 
-            add(preferences.enableTransitions()
+            add(preferences.pageTransitions()
                     .asObservable()
                     .subscribe { transitions = it })
+
+            add(preferences.cropBorders()
+                    .asObservable()
+                    .doOnNext { cropBorders = it }
+                    .skip(1)
+                    .distinctUntilChanged()
+                    .subscribe { refreshAdapter() })
         }
 
         setPagesOnAdapter()