DrawFrameTask.cpp revision 1b54fb27ac48495ed0b33868fda5776fb49fe0f3 
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    bool canUnblockUiThread;
87    bool canDrawThisFrame;
88    {
89        TreeInfo info(TreeInfo::MODE_FULL, mRenderThread->renderState());
90        canUnblockUiThread = syncFrameState(info);
91        canDrawThisFrame = info.out.canDrawThisFrame;
92    }
93
94    // Grab a copy of everything we need
95    CanvasContext* context = mContext;
96
97    // From this point on anything in "this" is *UNSAFE TO ACCESS*
98    if (canUnblockUiThread) {
99        unblockUiThread();
100    }
101
102    if (CC_LIKELY(canDrawThisFrame)) {
103        context->draw();
104    }
105
106    if (!canUnblockUiThread) {
107        unblockUiThread();
108    }
109}
110
111bool DrawFrameTask::syncFrameState(TreeInfo& info) {
112    ATRACE_CALL();
113    int64_t vsync = mFrameInfo[static_cast<int>(FrameInfoIndex::Vsync)];
114    mRenderThread->timeLord().vsyncReceived(vsync);
115    mContext->makeCurrent();
116    Caches::getInstance().textureCache.resetMarkInUse();
117
118    for (size_t i = 0; i < mLayers.size(); i++) {
119        mContext->processLayerUpdate(mLayers[i].get());
120    }
121    mLayers.clear();
122    mContext->prepareTree(info, mFrameInfo);
123
124    // This is after the prepareTree so that any pending operations
125    // (RenderNode tree state, prefetched layers, etc...) will be flushed.
126    if (CC_UNLIKELY(!mContext->hasSurface())) {
127        mSyncResult |= kSync_LostSurfaceRewardIfFound;
128    }
129
130    if (info.out.hasAnimations) {
131        if (info.out.requiresUiRedraw) {
132            mSyncResult |= kSync_UIRedrawRequired;
133        }
134    }
135    // If prepareTextures is false, we ran out of texture cache space
136    return info.prepareTextures;
137}
138
139void DrawFrameTask::unblockUiThread() {
140    AutoMutex _lock(mLock);
141    mSignal.signal();
142}
143
144} /* namespace renderthread */
145} /* namespace uirenderer */
146} /* namespace android */
147