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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 
     18 package android.view;
     19 
     20 import android.graphics.Bitmap;
     21 
     22 /**
     23  * An OpenGL ES 2.0 implementation of {@link HardwareLayer}.
     24  */
     25 abstract class GLES20Layer extends HardwareLayer {
     26     int mLayer;
     27     Finalizer mFinalizer;
     28 
     29     GLES20Layer() {
     30     }
     31 
     32     GLES20Layer(int width, int height, boolean opaque) {
     33         super(width, height, opaque);
     34     }
     35 
     36     /**
     37      * Returns the native layer object used to render this layer.
     38      *
     39      * @return A pointer to the native layer object, or 0 if the object is NULL
     40      */
     41     public int getLayer() {
     42         return mLayer;
     43     }
     44 
     45     @Override
     46     boolean copyInto(Bitmap bitmap) {
     47         return GLES20Canvas.nCopyLayer(mLayer, bitmap.mNativeBitmap);
     48     }
     49 
     50     @Override
     51     void update(int width, int height, boolean isOpaque) {
     52         super.update(width, height, isOpaque);
     53     }
     54 
     55     @Override
     56     void destroy() {
     57         if (mFinalizer != null) {
     58             mFinalizer.destroy();
     59             mFinalizer = null;
     60         }
     61         mLayer = 0;
     62     }
     63 
     64     @Override
     65     void flush() {
     66         if (mLayer != 0) {
     67             GLES20Canvas.nFlushLayer(mLayer);
     68         }
     69     }
     70 
     71     static class Finalizer {
     72         private int mLayerId;
     73 
     74         public Finalizer(int layerId) {
     75             mLayerId = layerId;
     76         }
     77 
     78         @Override
     79         protected void finalize() throws Throwable {
     80             try {
     81                 if (mLayerId != 0) {
     82                     GLES20Canvas.nDestroyLayerDeferred(mLayerId);
     83                 }
     84             } finally {
     85                 super.finalize();
     86             }
     87         }
     88 
     89         void destroy() {
     90             GLES20Canvas.nDestroyLayer(mLayerId);
     91             mLayerId = 0;
     92         }
     93     }
     94 }
     95