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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 package android.view;
     18 
     19 import android.graphics.Canvas;
     20 import android.graphics.Matrix;
     21 import android.graphics.Rect;
     22 
     23 /**
     24  * An OpenGL ES 2.0 implementation of {@link HardwareLayer}. This
     25  * implementation can be used a rendering target. It generates a
     26  * {@link Canvas} that can be used to render into an FBO using OpenGL.
     27  */
     28 class GLES20RenderLayer extends GLES20Layer {
     29     private int mLayerWidth;
     30     private int mLayerHeight;
     31 
     32     private final GLES20Canvas mCanvas;
     33 
     34     GLES20RenderLayer(int width, int height, boolean isOpaque) {
     35         super(width, height, isOpaque);
     36 
     37         int[] layerInfo = new int[2];
     38         mLayer = GLES20Canvas.nCreateLayer(width, height, isOpaque, layerInfo);
     39         if (mLayer != 0) {
     40             mLayerWidth = layerInfo[0];
     41             mLayerHeight = layerInfo[1];
     42 
     43             mCanvas = new GLES20Canvas(mLayer, !isOpaque);
     44             mFinalizer = new Finalizer(mLayer);
     45         } else {
     46             mCanvas = null;
     47             mFinalizer = null;
     48         }
     49     }
     50 
     51     @Override
     52     boolean isValid() {
     53         return mLayer != 0 && mLayerWidth > 0 && mLayerHeight > 0;
     54     }
     55 
     56     @Override
     57     void resize(int width, int height) {
     58         if (!isValid() || width <= 0 || height <= 0) return;
     59 
     60         mWidth = width;
     61         mHeight = height;
     62 
     63         if (width != mLayerWidth || height != mLayerHeight) {
     64             int[] layerInfo = new int[2];
     65 
     66             GLES20Canvas.nResizeLayer(mLayer, width, height, layerInfo);
     67 
     68             mLayerWidth = layerInfo[0];
     69             mLayerHeight = layerInfo[1];
     70         }
     71     }
     72 
     73     @Override
     74     HardwareCanvas getCanvas() {
     75         return mCanvas;
     76     }
     77 
     78     @Override
     79     void end(Canvas currentCanvas) {
     80         if (currentCanvas instanceof GLES20Canvas) {
     81             ((GLES20Canvas) currentCanvas).resume();
     82         }
     83     }
     84 
     85     @Override
     86     HardwareCanvas start(Canvas currentCanvas) {
     87         if (currentCanvas instanceof GLES20Canvas) {
     88             ((GLES20Canvas) currentCanvas).interrupt();
     89         }
     90         return getCanvas();
     91     }
     92 
     93     /**
     94      * Ignored
     95      */
     96     @Override
     97     void setTransform(Matrix matrix) {
     98     }
     99 
    100     @Override
    101     void redraw(DisplayList displayList, Rect dirtyRect) {
    102         GLES20Canvas.nUpdateRenderLayer(mLayer, mCanvas.getRenderer(),
    103                 ((GLES20DisplayList) displayList).getNativeDisplayList(),
    104                 dirtyRect.left, dirtyRect.top, dirtyRect.right, dirtyRect.bottom);
    105     }
    106 }
    107