Apply gravity in GifDrawable.

Fixes #206

library/src/androidTest/java/com/bumptech/glide/load/resource/gif/GifDrawableTest.java

@@ -4,6 +4,7 @@ import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.PixelFormat;
+import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import com.bumptech.glide.gifdecoder.GifDecoder;
 import com.bumptech.glide.gifdecoder.GifHeader;
@@ -23,7 +24,6 @@ import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.anyInt;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Matchers.isNull;
 import static org.mockito.Mockito.mock;
@@ -60,7 +60,7 @@ public class GifDrawableTest {
         Canvas canvas = mock(Canvas.class);
         drawable.draw(canvas);
 
-        verify(canvas).drawBitmap(eq(firstFrame), anyInt(), anyInt(), any(Paint.class));
+        verify(canvas).drawBitmap(eq(firstFrame), anyRect(), anyRect(), anyPaint());
     }
 
     @Test
@@ -71,8 +71,8 @@ public class GifDrawableTest {
         when(frameManager.getCurrentFrame()).thenReturn(null);
         drawable.draw(canvas);
 
-        verify(canvas).drawBitmap(eq(firstFrame), anyInt(), anyInt(), any(Paint.class));
-        verify(canvas, never()).drawBitmap((Bitmap) isNull(), anyInt(), anyInt(), any(Paint.class));
+        verify(canvas).drawBitmap(eq(firstFrame), anyRect(), anyRect(), anyPaint());
+        verify(canvas, never()).drawBitmap((Bitmap) isNull(), anyRect(), anyRect(), anyPaint());
     }
 
     @Test
@@ -80,7 +80,7 @@ public class GifDrawableTest {
         drawable = new GifDrawable(gifDecoder, frameManager, null, bitmapPool);
         Canvas canvas = mock(Canvas.class);
 
-        verify(canvas, never()).drawBitmap(any(Bitmap.class), anyInt(), anyInt(), any(Paint.class));
+        verify(canvas, never()).drawBitmap(any(Bitmap.class), anyRect(), anyRect(), anyPaint());
     }
 
     @Test
@@ -90,8 +90,8 @@ public class GifDrawableTest {
         when(frameManager.getCurrentFrame()).thenReturn(currentFrame);
 
         drawable.draw(canvas);
-        verify(canvas).drawBitmap(eq(currentFrame), anyInt(), anyInt(), any(Paint.class));
-        verify(canvas, never()).drawBitmap(eq(firstFrame), anyInt(), anyInt(), any(Paint.class));
+        verify(canvas).drawBitmap(eq(currentFrame), anyRect(), anyRect(), anyPaint());
+        verify(canvas, never()).drawBitmap(eq(firstFrame), anyRect(), anyRect(), anyPaint());
     }
 
     @Test
@@ -459,7 +459,15 @@ public class GifDrawableTest {
         drawable.recycle();
         Canvas canvas = mock(Canvas.class);
         drawable.draw(canvas);
-        verify(canvas, never()).drawBitmap(any(Bitmap.class), anyInt(), anyInt(), any(Paint.class));
+        verify(canvas, never()).drawBitmap(any(Bitmap.class), anyRect(), anyRect(), anyPaint());
+    }
+
+    private static Paint anyPaint() {
+        return any(Paint.class);
+    }
+
+    private static Rect anyRect() {
+        return any(Rect.class);
     }
 
     private void runLoops(int loopCount, int frameCount) {

library/src/main/java/com/bumptech/glide/load/resource/gif/GifDrawable.java

@@ -8,9 +8,11 @@ import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
 import android.graphics.PixelFormat;
+import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
 
+import android.view.Gravity;
 import com.bumptech.glide.gifdecoder.GifDecoder;
 import com.bumptech.glide.gifdecoder.GifHeader;
 import com.bumptech.glide.load.Transformation;
@@ -22,6 +24,7 @@ import com.bumptech.glide.load.resource.drawable.GlideDrawable;
  */
 public class GifDrawable extends GlideDrawable implements GifFrameManager.FrameCallback {
     private final Paint paint = new Paint();
+    private final Rect destRect = new Rect();
     private final GifFrameManager frameManager;
     private final GifState state;
     private final GifDecoder decoder;
@@ -43,6 +46,8 @@ public class GifDrawable extends GlideDrawable implements GifFrameManager.FrameC
     /** The number of times to loop through the gif animation. */
     private int maxLoopCount = LOOP_FOREVER;
 
+    private boolean applyGravity;
+
     /**
      * Constructor for GifDrawable.
      *
@@ -177,14 +182,26 @@ public class GifDrawable extends GlideDrawable implements GifFrameManager.FrameC
         this.isRunning = isRunning;
     }
 
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        super.onBoundsChange(bounds);
+        applyGravity = true;
+    }
+
     @Override
     public void draw(Canvas canvas) {
         if (isRecycled) {
             return;
         }
+
+        if (applyGravity) {
+            Gravity.apply(GifState.GRAVITY, getIntrinsicWidth(), getIntrinsicHeight(), getBounds(), destRect);
+            applyGravity = false;
+        }
+
         Bitmap currentFrame = frameManager.getCurrentFrame();
         Bitmap toDraw = currentFrame != null ? currentFrame : state.firstFrame;
-        canvas.drawBitmap(toDraw, 0, 0, paint);
+        canvas.drawBitmap(toDraw, null, destRect, paint);
     }
 
     @Override
@@ -266,6 +283,7 @@ public class GifDrawable extends GlideDrawable implements GifFrameManager.FrameC
     }
 
     static class GifState extends ConstantState {
+        private static final int GRAVITY = Gravity.FILL;
         String id;
         GifHeader gifHeader;
         byte[] data;