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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 import android.graphics.Paint;
     22 
     23 /**
     24  * An OpenGL ES 2.0 implementation of {@link HardwareLayer}.
     25  */
     26 abstract class GLES20Layer extends HardwareLayer {
     27     int mLayer;
     28     Finalizer mFinalizer;
     29 
     30     GLES20Layer() {
     31     }
     32 
     33     GLES20Layer(int width, int height, boolean opaque) {
     34         super(width, height, opaque);
     35     }
     36 
     37     /**
     38      * Returns the native layer object used to render this layer.
     39      *
     40      * @return A pointer to the native layer object, or 0 if the object is NULL
     41      */
     42     public int getLayer() {
     43         return mLayer;
     44     }
     45 
     46     @Override
     47     void setLayerPaint(Paint paint) {
     48         if (paint != null) {
     49             GLES20Canvas.nSetLayerPaint(mLayer, paint.mNativePaint);
     50             GLES20Canvas.nSetLayerColorFilter(mLayer, paint.getColorFilter() != null ?
     51                     paint.getColorFilter().nativeColorFilter : 0);
     52         }
     53     }
     54 
     55     @Override
     56     public boolean copyInto(Bitmap bitmap) {
     57         return GLES20Canvas.nCopyLayer(mLayer, bitmap.mNativeBitmap);
     58     }
     59 
     60     @Override
     61     public void destroy() {
     62         if (mFinalizer != null) {
     63             mFinalizer.destroy();
     64             mFinalizer = null;
     65         }
     66         mLayer = 0;
     67     }
     68 
     69     @Override
     70     void clearStorage() {
     71         if (mLayer != 0) GLES20Canvas.nClearLayerTexture(mLayer);
     72     }
     73 
     74     static class Finalizer {
     75         private int mLayerId;
     76 
     77         public Finalizer(int layerId) {
     78             mLayerId = layerId;
     79         }
     80 
     81         @Override
     82         protected void finalize() throws Throwable {
     83             try {
     84                 if (mLayerId != 0) {
     85                     GLES20Canvas.nDestroyLayerDeferred(mLayerId);
     86                 }
     87             } finally {
     88                 super.finalize();
     89             }
     90         }
     91 
     92         void destroy() {
     93             GLES20Canvas.nDestroyLayer(mLayerId);
     94             mLayerId = 0;
     95         }
     96     }
     97 }
     98