DrawFrameTask.cpp revision c052a9a1bb1d0b7918f73166a36e96e0b1a9ed92 
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    mRenderThread = thread;
43    mContext = context;
44}
45
46void DrawFrameTask::pushLayerUpdate(DeferredLayerUpdater* layer) {
47    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to pushLayerUpdate with!");
48
49    for (size_t i = 0; i < mLayers.size(); i++) {
50        if (mLayers[i].get() == layer) {
51            return;
52        }
53    }
54    mLayers.push_back(layer);
55}
56
57void DrawFrameTask::removeLayerUpdate(DeferredLayerUpdater* layer) {
58    for (size_t i = 0; i < mLayers.size(); i++) {
59        if (mLayers[i].get() == layer) {
60            mLayers.erase(mLayers.begin() + i);
61            return;
62        }
63    }
64}
65
66int DrawFrameTask::drawFrame() {
67    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
68
69    mSyncResult = kSync_OK;
70    mSyncQueued = systemTime(CLOCK_MONOTONIC);
71    postAndWait();
72
73    return mSyncResult;
74}
75
76void DrawFrameTask::postAndWait() {
77    AutoMutex _lock(mLock);
78    mRenderThread->queue(this);
79    mSignal.wait(mLock);
80}
81
82void DrawFrameTask::run() {
83    ATRACE_NAME("DrawFrame");
84
85    bool canUnblockUiThread;
86    bool canDrawThisFrame;
87    {
88        TreeInfo info(TreeInfo::MODE_FULL, mRenderThread->renderState());
89        canUnblockUiThread = syncFrameState(info);
90        canDrawThisFrame = info.out.canDrawThisFrame;
91    }
92
93    // Grab a copy of everything we need
94    CanvasContext* context = mContext;
95
96    // From this point on anything in "this" is *UNSAFE TO ACCESS*
97    if (canUnblockUiThread) {
98        unblockUiThread();
99    }
100
101    if (CC_LIKELY(canDrawThisFrame)) {
102        context->draw();
103    }
104
105    if (!canUnblockUiThread) {
106        unblockUiThread();
107    }
108}
109
110bool DrawFrameTask::syncFrameState(TreeInfo& info) {
111    ATRACE_CALL();
112    int64_t vsync = mFrameInfo[static_cast<int>(FrameInfoIndex::Vsync)];
113    mRenderThread->timeLord().vsyncReceived(vsync);
114    mContext->makeCurrent();
115    Caches::getInstance().textureCache.resetMarkInUse(mContext);
116
117    for (size_t i = 0; i < mLayers.size(); i++) {
118        mContext->processLayerUpdate(mLayers[i].get());
119    }
120    mLayers.clear();
121    mContext->prepareTree(info, mFrameInfo, mSyncQueued);
122
123    // This is after the prepareTree so that any pending operations
124    // (RenderNode tree state, prefetched layers, etc...) will be flushed.
125    if (CC_UNLIKELY(!mContext->hasSurface())) {
126        mSyncResult |= kSync_LostSurfaceRewardIfFound;
127    }
128
129    if (info.out.hasAnimations) {
130        if (info.out.requiresUiRedraw) {
131            mSyncResult |= kSync_UIRedrawRequired;
132        }
133    }
134    // If prepareTextures is false, we ran out of texture cache space
135    return info.prepareTextures;
136}
137
138void DrawFrameTask::unblockUiThread() {
139    AutoMutex _lock(mLock);
140    mSignal.signal();
141}
142
143} /* namespace renderthread */
144} /* namespace uirenderer */
145} /* namespace android */
146