DrawFrameTask.cpp revision b36016c65f1d1b5846dba0349aab491dbd3a746a 
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#define ATRACE_TAG ATRACE_TAG_VIEW
18
19#include "DrawFrameTask.h"
20
21#include <utils/Log.h>
22#include <utils/Trace.h>
23
24#include "../DeferredLayerUpdater.h"
25#include "../DisplayList.h"
26#include "../RenderNode.h"
27#include "CanvasContext.h"
28#include "RenderThread.h"
29
30namespace android {
31namespace uirenderer {
32namespace renderthread {
33
34DrawFrameTask::DrawFrameTask()
35        : mRenderThread(nullptr)
36        , mContext(nullptr)
37        , mSyncResult(kSync_OK) {
38}
39
40DrawFrameTask::~DrawFrameTask() {
41}
42
43void DrawFrameTask::setContext(RenderThread* thread, CanvasContext* context) {
44    mRenderThread = thread;
45    mContext = context;
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() {
69    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
70
71    mSyncResult = kSync_OK;
72    postAndWait();
73
74    return mSyncResult;
75}
76
77void DrawFrameTask::postAndWait() {
78    AutoMutex _lock(mLock);
79    mRenderThread->queue(this);
80    mSignal.wait(mLock);
81}
82
83void DrawFrameTask::run() {
84    ATRACE_NAME("DrawFrame");
85
86    mContext->profiler().startFrame();
87
88    bool canUnblockUiThread;
89    bool canDrawThisFrame;
90    {
91        TreeInfo info(TreeInfo::MODE_FULL, mRenderThread->renderState());
92        canUnblockUiThread = syncFrameState(info);
93        canDrawThisFrame = info.out.canDrawThisFrame;
94    }
95
96    // Grab a copy of everything we need
97    CanvasContext* context = mContext;
98
99    // From this point on anything in "this" is *UNSAFE TO ACCESS*
100    if (canUnblockUiThread) {
101        unblockUiThread();
102    }
103
104    if (CC_LIKELY(canDrawThisFrame)) {
105        context->draw();
106    }
107
108    if (!canUnblockUiThread) {
109        unblockUiThread();
110    }
111}
112
113bool DrawFrameTask::syncFrameState(TreeInfo& info) {
114    ATRACE_CALL();
115    int64_t vsync = mFrameInfo[static_cast<int>(FrameInfoIndex::kVsync)];
116    mRenderThread->timeLord().vsyncReceived(vsync);
117    mContext->makeCurrent();
118    Caches::getInstance().textureCache.resetMarkInUse();
119
120    for (size_t i = 0; i < mLayers.size(); i++) {
121        mContext->processLayerUpdate(mLayers[i].get());
122    }
123    mLayers.clear();
124    mContext->prepareTree(info, mFrameInfo);
125
126    // This is after the prepareTree so that any pending operations
127    // (RenderNode tree state, prefetched layers, etc...) will be flushed.
128    if (CC_UNLIKELY(!mContext->hasSurface())) {
129        mSyncResult |= kSync_LostSurfaceRewardIfFound;
130    }
131
132    if (info.out.hasAnimations) {
133        if (info.out.requiresUiRedraw) {
134            mSyncResult |= kSync_UIRedrawRequired;
135        }
136    }
137    // If prepareTextures is false, we ran out of texture cache space
138    return info.prepareTextures;
139}
140
141void DrawFrameTask::unblockUiThread() {
142    AutoMutex _lock(mLock);
143    mSignal.signal();
144}
145
146} /* namespace renderthread */
147} /* namespace uirenderer */
148} /* namespace android */
149