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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     boolean resize(int width, int height) {
     58         if (!isValid() || width <= 0 || height <= 0) return false;
     59 
     60         mWidth = width;
     61         mHeight = height;
     62 
     63         if (width != mLayerWidth || height != mLayerHeight) {
     64             int[] layerInfo = new int[2];
     65 
     66             if (GLES20Canvas.nResizeLayer(mLayer, width, height, layerInfo)) {
     67                 mLayerWidth = layerInfo[0];
     68                 mLayerHeight = layerInfo[1];
     69             } else {
     70                 // Failure: not enough GPU resources for requested size
     71                 mLayer = 0;
     72                 mLayerWidth = 0;
     73                 mLayerHeight = 0;
     74             }
     75         }
     76         return isValid();
     77     }
     78 
     79     @Override
     80     void setOpaque(boolean isOpaque) {
     81         mOpaque = isOpaque;
     82         GLES20Canvas.nSetOpaqueLayer(mLayer, isOpaque);
     83     }
     84 
     85     @Override
     86     HardwareCanvas getCanvas() {
     87         return mCanvas;
     88     }
     89 
     90     @Override
     91     void end(Canvas currentCanvas) {
     92         HardwareCanvas canvas = getCanvas();
     93         if (canvas != null) {
     94             canvas.onPostDraw();
     95         }
     96         if (currentCanvas instanceof GLES20Canvas) {
     97             ((GLES20Canvas) currentCanvas).resume();
     98         }
     99     }
    100 
    101     @Override
    102     HardwareCanvas start(Canvas currentCanvas) {
    103         if (currentCanvas instanceof GLES20Canvas) {
    104             ((GLES20Canvas) currentCanvas).interrupt();
    105         }
    106         HardwareCanvas canvas = getCanvas();
    107         canvas.setViewport(mWidth, mHeight);
    108         canvas.onPreDraw(null);
    109         return canvas;
    110     }
    111 
    112     /**
    113      * Ignored
    114      */
    115     @Override
    116     void setTransform(Matrix matrix) {
    117     }
    118 
    119     @Override
    120     void redrawLater(DisplayList displayList, Rect dirtyRect) {
    121         GLES20Canvas.nUpdateRenderLayer(mLayer, mCanvas.getRenderer(),
    122                 ((GLES20DisplayList) displayList).getNativeDisplayList(),
    123                 dirtyRect.left, dirtyRect.top, dirtyRect.right, dirtyRect.bottom);
    124     }
    125 }
    126