CanvasContext.h revision 1125d1fa92ab9f3b8315bbfb72e038b62dfd454b 
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 <set>
21
22#include <cutils/compiler.h>
23#include <EGL/egl.h>
24#include <SkBitmap.h>
25#include <utils/Functor.h>
26#include <utils/Vector.h>
27
28#include "../DamageAccumulator.h"
29#include "../DrawProfiler.h"
30#include "../IContextFactory.h"
31#include "../RenderNode.h"
32#include "RenderTask.h"
33#include "RenderThread.h"
34
35#define FUNCTOR_PROCESS_DELAY 4
36
37namespace android {
38namespace uirenderer {
39
40class AnimationContext;
41class DeferredLayerUpdater;
42class OpenGLRenderer;
43class Rect;
44class Layer;
45class RenderState;
46
47namespace renderthread {
48
49class EglManager;
50
51enum SwapBehavior {
52    kSwap_default,
53    kSwap_discardBuffer,
54};
55
56// This per-renderer class manages the bridge between the global EGL context
57// and the render surface.
58// TODO: Rename to Renderer or some other per-window, top-level manager
59class CanvasContext : public IFrameCallback {
60public:
61    CanvasContext(RenderThread& thread, bool translucent, RenderNode* rootRenderNode,
62            IContextFactory* contextFactory);
63    virtual ~CanvasContext();
64
65    // Won't take effect until next EGLSurface creation
66    void setSwapBehavior(SwapBehavior swapBehavior);
67
68    bool initialize(ANativeWindow* window);
69    void updateSurface(ANativeWindow* window);
70    void pauseSurface(ANativeWindow* window);
71    void setup(int width, int height, const Vector3& lightCenter, float lightRadius,
72            uint8_t ambientShadowAlpha, uint8_t spotShadowAlpha);
73    void setOpaque(bool opaque);
74    void makeCurrent();
75    void processLayerUpdate(DeferredLayerUpdater* layerUpdater);
76    void prepareTree(TreeInfo& info);
77    void draw();
78    void destroy();
79
80    // IFrameCallback, Chroreographer-driven frame callback entry point
81    virtual void doFrame();
82
83    void buildLayer(RenderNode* node);
84    bool copyLayerInto(DeferredLayerUpdater* layer, SkBitmap* bitmap);
85    void markLayerInUse(RenderNode* node);
86
87    void destroyHardwareResources();
88    static void trimMemory(RenderThread& thread, int level);
89
90    static void invokeFunctor(RenderThread& thread, Functor* functor);
91
92    void runWithGlContext(RenderTask* task);
93
94    Layer* createTextureLayer();
95
96    ANDROID_API static void setTextureAtlas(RenderThread& thread,
97            const sp<GraphicBuffer>& buffer, int64_t* map, size_t mapSize);
98
99    void stopDrawing();
100    void notifyFramePending();
101
102    DrawProfiler& profiler() { return mProfiler; }
103
104private:
105    friend class RegisterFrameCallbackTask;
106    // TODO: Replace with something better for layer & other GL object
107    // lifecycle tracking
108    friend class android::uirenderer::RenderState;
109
110    void setSurface(ANativeWindow* window);
111    void swapBuffers();
112    void requireSurface();
113
114    void requireGlContext();
115
116    void freePrefetechedLayers();
117
118    RenderThread& mRenderThread;
119    EglManager& mEglManager;
120    sp<ANativeWindow> mNativeWindow;
121    EGLSurface mEglSurface;
122    bool mBufferPreserved;
123    SwapBehavior mSwapBehavior;
124
125    bool mOpaque;
126    OpenGLRenderer* mCanvas;
127    bool mHaveNewSurface;
128    DamageAccumulator mDamageAccumulator;
129    AnimationContext* mAnimationContext;
130
131    const sp<RenderNode> mRootRenderNode;
132
133    DrawProfiler mProfiler;
134
135    std::set<RenderNode*> mPrefetechedLayers;
136};
137
138} /* namespace renderthread */
139} /* namespace uirenderer */
140} /* namespace android */
141#endif /* CANVASCONTEXT_H_ */
142