am 64339168: Merge "Don\'t destroy the same texture twice Bug #7221449" into jb-mr1-dev

* commit '64339168c4ff0b3ac249398811db7c88eca8f95c':
  Don't destroy the same texture twice Bug #7221449

core/java/android/view/GLES20Canvas.java

@@ -166,6 +166,7 @@ class GLES20Canvas extends HardwareCanvas {
     static native void nSetLayerColorFilter(int layerId, int nativeColorFilter);
     static native void nUpdateTextureLayer(int layerId, int width, int height, boolean opaque,
             SurfaceTexture surface);
+    static native void nClearLayerTexture(int layerId);
     static native void nSetTextureLayerTransform(int layerId, int matrix);
     static native void nDestroyLayer(int layerId);
     static native void nDestroyLayerDeferred(int layerId);

core/java/android/view/GLES20Layer.java

@@ -66,6 +66,11 @@ abstract class GLES20Layer extends HardwareLayer {
         mLayer = 0;
     }
 
+    @Override
+    void clearStorage() {
+        if (mLayer != 0) GLES20Canvas.nClearLayerTexture(mLayer);
+    }
+
     static class Finalizer {
         private int mLayerId;
 

core/java/android/view/GLES20TextureLayer.java

@@ -39,7 +39,7 @@ class GLES20TextureLayer extends GLES20Layer {
             mFinalizer = new Finalizer(mLayer);
         } else {
             mFinalizer = null;
-        }        
+        }
     }
 
     @Override

core/java/android/view/HardwareLayer.java

@@ -204,4 +204,9 @@ abstract class HardwareLayer {
      * @param dirtyRect The dirty region of the layer that needs to be redrawn
      */
     abstract void redrawLater(DisplayList displayList, Rect dirtyRect);
+
+    /**
+     * Indicates that this layer has lost its underlying storage.
+     */
+    abstract void clearStorage();
 }

core/java/android/view/TextureView.java

@@ -224,6 +224,7 @@ public class TextureView extends View {
     private void destroySurface() {
         if (mLayer != null) {
             mSurface.detachFromGLContext();
+            mLayer.clearStorage();
 
             boolean shouldRelease = true;
             if (mListener != null) {