DrawFrameTask.cpp revision d72e0a339b54af0c4e731513bbad120dff694723 
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        , mFrameTimeNanos(0)
38        , mRecordDurationNanos(0)
39        , mDensity(1.0f) // safe enough default
40        , mSyncResult(kSync_OK) {
41}
42
43DrawFrameTask::~DrawFrameTask() {
44}
45
46void DrawFrameTask::setContext(RenderThread* thread, CanvasContext* context) {
47    mRenderThread = thread;
48    mContext = context;
49}
50
51void DrawFrameTask::pushLayerUpdate(DeferredLayerUpdater* layer) {
52    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to pushLayerUpdate with!");
53
54    for (size_t i = 0; i < mLayers.size(); i++) {
55        if (mLayers[i].get() == layer) {
56            return;
57        }
58    }
59    mLayers.push_back(layer);
60}
61
62void DrawFrameTask::removeLayerUpdate(DeferredLayerUpdater* layer) {
63    for (size_t i = 0; i < mLayers.size(); i++) {
64        if (mLayers[i].get() == layer) {
65            mLayers.erase(mLayers.begin() + i);
66            return;
67        }
68    }
69}
70
71void DrawFrameTask::setDirty(int left, int top, int right, int bottom) {
72    mDirty.set(left, top, right, bottom);
73}
74
75int DrawFrameTask::drawFrame(nsecs_t frameTimeNanos, nsecs_t recordDurationNanos) {
76    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
77
78    mSyncResult = kSync_OK;
79    mFrameTimeNanos = frameTimeNanos;
80    mRecordDurationNanos = recordDurationNanos;
81    postAndWait();
82
83    // Reset the single-frame data
84    mFrameTimeNanos = 0;
85    mRecordDurationNanos = 0;
86    mDirty.setEmpty();
87
88    return mSyncResult;
89}
90
91void DrawFrameTask::postAndWait() {
92    AutoMutex _lock(mLock);
93    mRenderThread->queue(this);
94    mSignal.wait(mLock);
95}
96
97void DrawFrameTask::run() {
98    ATRACE_NAME("DrawFrame");
99
100    mContext->profiler().setDensity(mDensity);
101    mContext->profiler().startFrame(mRecordDurationNanos);
102
103    bool canUnblockUiThread;
104    bool canDrawThisFrame;
105    {
106        TreeInfo info;
107        canUnblockUiThread = syncFrameState(info);
108        canDrawThisFrame = info.out.canDrawThisFrame;
109    }
110
111    // Grab a copy of everything we need
112    Rect dirty(mDirty);
113    CanvasContext* context = mContext;
114
115    // From this point on anything in "this" is *UNSAFE TO ACCESS*
116    if (canUnblockUiThread) {
117        unblockUiThread();
118    }
119
120    if (CC_LIKELY(canDrawThisFrame)) {
121        context->draw(&dirty);
122    }
123
124    if (!canUnblockUiThread) {
125        unblockUiThread();
126    }
127}
128
129static void initTreeInfo(TreeInfo& info) {
130    info.prepareTextures = true;
131    info.performStagingPush = true;
132    info.evaluateAnimations = true;
133}
134
135bool DrawFrameTask::syncFrameState(TreeInfo& info) {
136    ATRACE_CALL();
137    mRenderThread->timeLord().vsyncReceived(mFrameTimeNanos);
138    mContext->makeCurrent();
139    Caches::getInstance().textureCache.resetMarkInUse();
140    initTreeInfo(info);
141
142    for (size_t i = 0; i < mLayers.size(); i++) {
143        mContext->processLayerUpdate(mLayers[i].get(), info);
144    }
145    mLayers.clear();
146    if (info.out.hasAnimations) {
147        // TODO: Uh... crap?
148    }
149    mContext->prepareTree(info);
150
151    if (info.out.hasAnimations) {
152        // TODO: dirty calculations, for now just do a full-screen inval
153        mDirty.setEmpty();
154        if (info.out.requiresUiRedraw) {
155            mSyncResult |= kSync_UIRedrawRequired;
156        }
157    }
158    // If prepareTextures is false, we ran out of texture cache space
159    return !info.out.hasFunctors && info.prepareTextures;
160}
161
162void DrawFrameTask::unblockUiThread() {
163    AutoMutex _lock(mLock);
164    mSignal.signal();
165}
166
167} /* namespace renderthread */
168} /* namespace uirenderer */
169} /* namespace android */
170