GLES20RenderLayer.java revision 17112ad8a21a77620eb1ff14dcf8bdd6b7859712 
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
17package android.view;
18
19import android.graphics.Canvas;
20import android.graphics.Matrix;
21import 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 */
28class 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    void setOpaque(boolean isOpaque) {
75        mOpaque = isOpaque;
76        GLES20Canvas.nSetOpaqueLayer(mLayer, isOpaque);
77    }
78
79    @Override
80    HardwareCanvas getCanvas() {
81        return mCanvas;
82    }
83
84    @Override
85    void end() {
86    }
87
88    @Override
89    HardwareCanvas start() {
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