DrawFrameTask.cpp revision 825fa4d5ae7b2907ee1769d09e6333306de2a92e 
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#include "DrawFrameTask.h"
18
19#include <utils/Log.h>
20#include <utils/Trace.h>
21
22#include "../DeferredLayerUpdater.h"
23#include "../DisplayList.h"
24#include "../RenderNode.h"
25#include "CanvasContext.h"
26#include "RenderThread.h"
27
28namespace android {
29namespace uirenderer {
30namespace renderthread {
31
32DrawFrameTask::DrawFrameTask()
33        : mRenderThread(nullptr)
34        , mContext(nullptr)
35        , mSyncResult(kSync_OK) {
36}
37
38DrawFrameTask::~DrawFrameTask() {
39}
40
41void DrawFrameTask::setContext(RenderThread* thread, CanvasContext* context,
42        RenderNode* targetNode) {
43    mRenderThread = thread;
44    mContext = context;
45    mTargetNode = targetNode;
46}
47
48void DrawFrameTask::pushLayerUpdate(DeferredLayerUpdater* layer) {
49    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to pushLayerUpdate with!");
50
51    for (size_t i = 0; i < mLayers.size(); i++) {
52        if (mLayers[i].get() == layer) {
53            return;
54        }
55    }
56    mLayers.push_back(layer);
57}
58
59void DrawFrameTask::removeLayerUpdate(DeferredLayerUpdater* layer) {
60    for (size_t i = 0; i < mLayers.size(); i++) {
61        if (mLayers[i].get() == layer) {
62            mLayers.erase(mLayers.begin() + i);
63            return;
64        }
65    }
66}
67
68int DrawFrameTask::drawFrame(TreeObserver* observer) {
69    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
70
71    mSyncResult = kSync_OK;
72    mSyncQueued = systemTime(CLOCK_MONOTONIC);
73    mObserver = observer;
74    postAndWait();
75
76    return mSyncResult;
77}
78
79void DrawFrameTask::postAndWait() {
80    AutoMutex _lock(mLock);
81    mRenderThread->queue(this);
82    mSignal.wait(mLock);
83}
84
85void DrawFrameTask::run() {
86    ATRACE_NAME("DrawFrame");
87
88    bool canUnblockUiThread;
89    bool canDrawThisFrame;
90    {
91        TreeInfo info(TreeInfo::MODE_FULL, *mContext);
92        info.observer = mObserver;
93        canUnblockUiThread = syncFrameState(info);
94        canDrawThisFrame = info.out.canDrawThisFrame;
95    }
96
97    // Grab a copy of everything we need
98    CanvasContext* context = mContext;
99
100    // From this point on anything in "this" is *UNSAFE TO ACCESS*
101    if (canUnblockUiThread) {
102        unblockUiThread();
103    }
104
105    if (CC_LIKELY(canDrawThisFrame)) {
106        context->draw();
107    }
108
109    if (!canUnblockUiThread) {
110        unblockUiThread();
111    }
112}
113
114bool DrawFrameTask::syncFrameState(TreeInfo& info) {
115    ATRACE_CALL();
116    int64_t vsync = mFrameInfo[static_cast<int>(FrameInfoIndex::Vsync)];
117    mRenderThread->timeLord().vsyncReceived(vsync);
118    mContext->makeCurrent();
119    Caches::getInstance().textureCache.resetMarkInUse(mContext);
120
121    for (size_t i = 0; i < mLayers.size(); i++) {
122        mLayers[i]->apply();
123    }
124    mLayers.clear();
125    mContext->prepareTree(info, mFrameInfo, mSyncQueued, mTargetNode);
126
127    // This is after the prepareTree so that any pending operations
128    // (RenderNode tree state, prefetched layers, etc...) will be flushed.
129    if (CC_UNLIKELY(!mContext->hasSurface())) {
130        mSyncResult |= kSync_LostSurfaceRewardIfFound;
131    }
132
133    if (info.out.hasAnimations) {
134        if (info.out.requiresUiRedraw) {
135            mSyncResult |= kSync_UIRedrawRequired;
136        }
137    }
138    // If prepareTextures is false, we ran out of texture cache space
139    return info.prepareTextures;
140}
141
142void DrawFrameTask::unblockUiThread() {
143    AutoMutex _lock(mLock);
144    mSignal.signal();
145}
146
147} /* namespace renderthread */
148} /* namespace uirenderer */
149} /* namespace android */
150