1 files changed, 31 insertions, 0 deletions
diff --git a/core/java/android/transition/TransitionUtils.java b/core/java/android/transition/TransitionUtils.java
index 03423ff..49ceb3b 100644
--- a/core/java/android/transition/TransitionUtils.java
+++ b/core/java/android/transition/TransitionUtils.java
@@ -22,8 +22,10 @@ import android.animation.TypeEvaluator;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Matrix;
+import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
@@ -109,6 +111,35 @@ public class TransitionUtils {
     }
 
     /**
+     * Get a copy of bitmap of given drawable, return null if intrinsic size is zero
+     */
+    public static Bitmap createDrawableBitmap(Drawable drawable) {
+        int width = drawable.getIntrinsicWidth();
+        int height = drawable.getIntrinsicHeight();
+        if (width <= 0 || height <= 0) {
+            return null;
+        }
+        float scale = Math.min(1f, ((float)MAX_IMAGE_SIZE) / (width * height));
+        if (drawable instanceof BitmapDrawable && scale == 1f) {
+            // return same bitmap if scale down not needed
+            return ((BitmapDrawable) drawable).getBitmap();
+        }
+        int bitmapWidth = (int) (width * scale);
+        int bitmapHeight = (int) (height * scale);
+        Bitmap bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(bitmap);
+        Rect existingBounds = drawable.getBounds();
+        int left = existingBounds.left;
+        int top = existingBounds.top;
+        int right = existingBounds.right;
+        int bottom = existingBounds.bottom;
+        drawable.setBounds(0, 0, bitmapWidth, bitmapHeight);
+        drawable.draw(canvas);
+        drawable.setBounds(left, top, right, bottom);
+        return bitmap;
+    }
+
+    /**
      * Creates a Bitmap of the given view, using the Matrix matrix to transform to the local
      * coordinates. <code>matrix</code> will be modified during the bitmap creation.
      *