Set color filter once

Author: barteksc

android-pdf-viewer/src/main/java/com/github/barteksc/pdfviewer/PDFView.java

@@ -42,12 +42,12 @@
 import com.github.barteksc.pdfviewer.listener.OnDrawListener;
 import com.github.barteksc.pdfviewer.listener.OnErrorListener;
 import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener;
+import com.github.barteksc.pdfviewer.listener.OnLongPressListener;
 import com.github.barteksc.pdfviewer.listener.OnPageChangeListener;
 import com.github.barteksc.pdfviewer.listener.OnPageErrorListener;
 import com.github.barteksc.pdfviewer.listener.OnPageScrollListener;
 import com.github.barteksc.pdfviewer.listener.OnRenderListener;
 import com.github.barteksc.pdfviewer.listener.OnTapListener;
-import com.github.barteksc.pdfviewer.listener.OnLongPressListener;
 import com.github.barteksc.pdfviewer.model.PagePart;
 import com.github.barteksc.pdfviewer.scroll.ScrollHandle;
 import com.github.barteksc.pdfviewer.source.AssetSource;
@@ -377,7 +377,22 @@ public void setSwipeEnabled(boolean enableSwipe) {
         this.enableSwipe = enableSwipe;
     }
 
-    public void setNightMode(boolean nightMode) { this.nightMode = nightMode; }
+    public void setNightMode(boolean nightMode) {
+        this.nightMode = nightMode;
+        if (nightMode) {
+            ColorMatrix colorMatrixInverted =
+                    new ColorMatrix(new float[]{
+                            -1, 0, 0, 0, 255,
+                            0, -1, 0, 0, 255,
+                            0, 0, -1, 0, 255,
+                            0, 0, 0, 1, 0});
+
+            ColorMatrixColorFilter filter = new ColorMatrixColorFilter(colorMatrixInverted);
+            paint.setColorFilter(filter);
+        } else {
+            paint.setColorFilter(null);
+        }
+    }
 
     void enableDoubletap(boolean enableDoubletap) {
         this.doubletapEnabled = enableDoubletap;
@@ -555,11 +570,7 @@ protected void onDraw(Canvas canvas) {
 
         Drawable bg = getBackground();
         if (bg == null) {
-            if (this.nightMode)
-                canvas.drawColor(Color.BLACK);
-            else
-                canvas.drawColor(Color.WHITE);
-
+            canvas.drawColor(nightMode ? Color.BLACK : Color.WHITE);
         } else {
             bg.draw(canvas);
         }
@@ -675,25 +686,6 @@ private void drawPart(Canvas canvas, PagePart part) {
             return;
         }
 
-
-        // NIGHT MODE !!!
-        if ( this.nightMode ) {
-            paint = new Paint();
-            ColorMatrix colorMatrix_Inverted =
-                    new ColorMatrix(new float[] {
-                            -1,  0,  0,  0, 255,
-                            0, -1,  0,  0, 255,
-                            0,  0, -1,  0, 255,
-                            0,  0,  0,  1,   0});
-
-
-            ColorMatrixColorFilter filter = new ColorMatrixColorFilter(colorMatrix_Inverted);
-            paint.setColorFilter(filter);
-        }
-        else
-            paint = new Paint();
-        // NIGHT MODE !!!
-
         canvas.drawBitmap(renderedBitmap, srcRect, dstRect, paint);
 
         if (Constants.DEBUG_MODE) {
@@ -1473,7 +1465,7 @@ public Configurator pageFling(boolean pageFling) {
             return this;
         }
 
-        public Configurator setNightMode(boolean nightMode) {
+        public Configurator nightMode(boolean nightMode) {
             this.nightMode = nightMode;
             return this;
         }