CanvasContext.h revision 63a06673253914510bbeebd500655008682dade1 
1/*
2 * Copyright (C) 2014 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#ifndef CANVASCONTEXT_H_
18#define CANVASCONTEXT_H_
19
20#include <cutils/compiler.h>
21#include <EGL/egl.h>
22#include <SkBitmap.h>
23#include <utils/Functor.h>
24#include <utils/Vector.h>
25
26#include "../RenderNode.h"
27#include "RenderTask.h"
28#include "RenderThread.h"
29
30#define FUNCTOR_PROCESS_DELAY 4
31
32namespace android {
33namespace uirenderer {
34
35class DeferredLayerUpdater;
36class OpenGLRenderer;
37class Rect;
38class Layer;
39
40namespace renderthread {
41
42class GlobalContext;
43
44// This per-renderer class manages the bridge between the global EGL context
45// and the render surface.
46class CanvasContext : public IFrameCallback {
47public:
48    CanvasContext(bool translucent, RenderNode* rootRenderNode);
49    virtual ~CanvasContext();
50
51    bool initialize(EGLNativeWindowType window);
52    void updateSurface(EGLNativeWindowType window);
53    void pauseSurface(EGLNativeWindowType window);
54    void setup(int width, int height);
55    void setOpaque(bool opaque);
56    void makeCurrent();
57    void prepareDraw(const Vector<DeferredLayerUpdater*>* layerUpdaters, TreeInfo& info);
58    void draw(Rect* dirty);
59    void destroyCanvasAndSurface();
60
61    // IFrameCallback, Chroreographer-driven frame callback entry point
62    virtual void doFrame();
63
64    bool copyLayerInto(DeferredLayerUpdater* layer, SkBitmap* bitmap);
65
66    void invokeFunctor(Functor* functor);
67
68    void runWithGlContext(RenderTask* task);
69
70    Layer* createRenderLayer(int width, int height);
71    Layer* createTextureLayer();
72
73private:
74    void processLayerUpdates(const Vector<DeferredLayerUpdater*>* layerUpdaters, TreeInfo& info);
75    void prepareTree(TreeInfo& info);
76
77    void setSurface(EGLNativeWindowType window);
78    void swapBuffers();
79    void requireSurface();
80
81    void requireGlContext();
82
83    GlobalContext* mGlobalContext;
84    RenderThread& mRenderThread;
85    EGLSurface mEglSurface;
86    bool mDirtyRegionsEnabled;
87
88    bool mOpaque;
89    OpenGLRenderer* mCanvas;
90    bool mHaveNewSurface;
91
92    const sp<RenderNode> mRootRenderNode;
93};
94
95} /* namespace renderthread */
96} /* namespace uirenderer */
97} /* namespace android */
98#endif /* CANVASCONTEXT_H_ */
99