DrawFrameTask.cpp revision d5a4a1aac980c304d6f46f07f15bfc5c94d8f9d0 
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(NULL)
36        , mContext(NULL)
37        , mDensity(1.0f) // safe enough default
38        , mSyncResult(kSync_OK) {
39}
40
41DrawFrameTask::~DrawFrameTask() {
42}
43
44void DrawFrameTask::setContext(RenderThread* thread, CanvasContext* context) {
45    mRenderThread = thread;
46    mContext = context;
47}
48
49void DrawFrameTask::pushLayerUpdate(DeferredLayerUpdater* layer) {
50    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to pushLayerUpdate with!");
51
52    for (size_t i = 0; i < mLayers.size(); i++) {
53        if (mLayers[i].get() == layer) {
54            return;
55        }
56    }
57    mLayers.push_back(layer);
58}
59
60void DrawFrameTask::removeLayerUpdate(DeferredLayerUpdater* layer) {
61    for (size_t i = 0; i < mLayers.size(); i++) {
62        if (mLayers[i].get() == layer) {
63            mLayers.erase(mLayers.begin() + i);
64            return;
65        }
66    }
67}
68
69int DrawFrameTask::drawFrame() {
70    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
71
72    mSyncResult = kSync_OK;
73    postAndWait();
74
75    return mSyncResult;
76}
77
78void DrawFrameTask::postAndWait() {
79    AutoMutex _lock(mLock);
80    mRenderThread->queue(this);
81    mSignal.wait(mLock);
82}
83
84void DrawFrameTask::run() {
85    ATRACE_NAME("DrawFrame");
86
87    mContext->profiler().setDensity(mDensity);
88    mContext->profiler().startFrame();
89
90    bool canUnblockUiThread;
91    bool canDrawThisFrame;
92    {
93        TreeInfo info(TreeInfo::MODE_FULL, mRenderThread->renderState());
94        canUnblockUiThread = syncFrameState(info);
95        canDrawThisFrame = info.out.canDrawThisFrame;
96    }
97
98    // Grab a copy of everything we need
99    CanvasContext* context = mContext;
100
101    // From this point on anything in "this" is *UNSAFE TO ACCESS*
102    if (canUnblockUiThread) {
103        unblockUiThread();
104    }
105
106    if (CC_LIKELY(canDrawThisFrame)) {
107        context->draw();
108    }
109
110    if (!canUnblockUiThread) {
111        unblockUiThread();
112    }
113}
114
115bool DrawFrameTask::syncFrameState(TreeInfo& info) {
116    ATRACE_CALL();
117    mRenderThread->timeLord().vsyncReceived(mFrameInfo[FrameInfoIndex::kVsync]);
118    mContext->makeCurrent();
119    Caches::getInstance().textureCache.resetMarkInUse();
120
121    for (size_t i = 0; i < mLayers.size(); i++) {
122        mContext->processLayerUpdate(mLayers[i].get());
123    }
124    mLayers.clear();
125    mContext->prepareTree(info, mFrameInfo);
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