DrawFrameTask.cpp revision a5dda645da738da7b4ae15e28fa7d93d3b04b94f 
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 "../DisplayList.h"
25#include "../RenderNode.h"
26#include "CanvasContext.h"
27#include "RenderThread.h"
28
29namespace android {
30namespace uirenderer {
31namespace renderthread {
32
33DrawFrameTask::DrawFrameTask()
34        : mRenderThread(NULL)
35        , mContext(NULL)
36        , mFrameTimeNanos(0)
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::addLayer(DeferredLayerUpdater* layer) {
49    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to addLayer with!");
50
51    mLayers.push(layer);
52}
53
54void DrawFrameTask::removeLayer(DeferredLayerUpdater* layer) {
55    for (size_t i = 0; i < mLayers.size(); i++) {
56        if (mLayers[i] == layer) {
57            mLayers.removeAt(i);
58            break;
59        }
60    }
61}
62
63void DrawFrameTask::setDirty(int left, int top, int right, int bottom) {
64    mDirty.set(left, top, right, bottom);
65}
66
67int DrawFrameTask::drawFrame(nsecs_t frameTimeNanos) {
68    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
69
70    mSyncResult = kSync_OK;
71    mFrameTimeNanos = frameTimeNanos;
72    postAndWait();
73
74    // Reset the single-frame data
75    mFrameTimeNanos = 0;
76    mDirty.setEmpty();
77
78    return mSyncResult;
79}
80
81void DrawFrameTask::postAndWait() {
82    AutoMutex _lock(mLock);
83    mRenderThread->queue(this);
84    mSignal.wait(mLock);
85}
86
87void DrawFrameTask::run() {
88    ATRACE_NAME("DrawFrame");
89
90    bool canUnblockUiThread;
91    bool canDrawThisFrame;
92    {
93        TreeInfo info;
94        canUnblockUiThread = syncFrameState(info);
95        canDrawThisFrame = info.out.canDrawThisFrame;
96    }
97
98    // Grab a copy of everything we need
99    Rect dirty(mDirty);
100    CanvasContext* context = mContext;
101
102    // From this point on anything in "this" is *UNSAFE TO ACCESS*
103    if (canUnblockUiThread) {
104        unblockUiThread();
105    }
106
107    if (CC_LIKELY(canDrawThisFrame)) {
108        context->draw(&dirty);
109    }
110
111    if (!canUnblockUiThread) {
112        unblockUiThread();
113    }
114}
115
116static void initTreeInfo(TreeInfo& info) {
117    info.prepareTextures = true;
118    info.performStagingPush = true;
119    info.evaluateAnimations = true;
120}
121
122bool DrawFrameTask::syncFrameState(TreeInfo& info) {
123    ATRACE_CALL();
124    mRenderThread->timeLord().vsyncReceived(mFrameTimeNanos);
125    mContext->makeCurrent();
126    Caches::getInstance().textureCache.resetMarkInUse();
127    initTreeInfo(info);
128    mContext->prepareDraw(&mLayers, info);
129    if (info.out.hasAnimations) {
130        // TODO: dirty calculations, for now just do a full-screen inval
131        mDirty.setEmpty();
132        if (info.out.requiresUiRedraw) {
133            mSyncResult |= kSync_UIRedrawRequired;
134        }
135    }
136    // If prepareTextures is false, we ran out of texture cache space
137    return !info.out.hasFunctors && info.prepareTextures;
138}
139
140void DrawFrameTask::unblockUiThread() {
141    AutoMutex _lock(mLock);
142    mSignal.signal();
143}
144
145} /* namespace renderthread */
146} /* namespace uirenderer */
147} /* namespace android */
148