DrawFrameTask.cpp revision 2de950d5a8b47c7b4648ada1b1260ce4b7342798 
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(SyncResult::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() {
69    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
70
71    mSyncResult = SyncResult::OK;
72    mSyncQueued = systemTime(CLOCK_MONOTONIC);
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    bool canUnblockUiThread;
88    bool canDrawThisFrame;
89    {
90        TreeInfo info(TreeInfo::MODE_FULL, *mContext);
91        canUnblockUiThread = syncFrameState(info);
92        canDrawThisFrame = info.out.canDrawThisFrame;
93    }
94
95    // Grab a copy of everything we need
96    CanvasContext* context = mContext;
97
98    // From this point on anything in "this" is *UNSAFE TO ACCESS*
99    if (canUnblockUiThread) {
100        unblockUiThread();
101    }
102
103    if (CC_LIKELY(canDrawThisFrame)) {
104        context->draw();
105    } else {
106        // wait on fences so tasks don't overlap next frame
107        context->waitOnFences();
108    }
109
110    if (!canUnblockUiThread) {
111        unblockUiThread();
112    }
113}
114
115bool DrawFrameTask::syncFrameState(TreeInfo& info) {
116    ATRACE_CALL();
117    int64_t vsync = mFrameInfo[static_cast<int>(FrameInfoIndex::Vsync)];
118    mRenderThread->timeLord().vsyncReceived(vsync);
119    bool canDraw = mContext->makeCurrent();
120    mContext->unpinImages();
121
122    for (size_t i = 0; i < mLayers.size(); i++) {
123        mLayers[i]->apply();
124    }
125    mLayers.clear();
126    mContext->prepareTree(info, mFrameInfo, mSyncQueued, mTargetNode);
127
128    // This is after the prepareTree so that any pending operations
129    // (RenderNode tree state, prefetched layers, etc...) will be flushed.
130    if (CC_UNLIKELY(!mContext->hasSurface() || !canDraw)) {
131        if (!mContext->hasSurface()) {
132            mSyncResult |= SyncResult::LostSurfaceRewardIfFound;
133        } else {
134            // If we have a surface but can't draw we must be stopped
135            mSyncResult |= SyncResult::ContextIsStopped;
136        }
137        info.out.canDrawThisFrame = false;
138    }
139
140    if (info.out.hasAnimations) {
141        if (info.out.requiresUiRedraw) {
142            mSyncResult |= SyncResult::UIRedrawRequired;
143        }
144    }
145    // If prepareTextures is false, we ran out of texture cache space
146    return info.prepareTextures;
147}
148
149void DrawFrameTask::unblockUiThread() {
150    AutoMutex _lock(mLock);
151    mSignal.signal();
152}
153
154} /* namespace renderthread */
155} /* namespace uirenderer */
156} /* namespace android */
157