DrawFrameTask.cpp revision fe5e7b7346a54537b980796ceeca66bfdbd05561 
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        , mRecordDurationNanos(0)
38        , mDensity(1.0f) // safe enough default
39        , mSyncResult(kSync_OK) {
40}
41
42DrawFrameTask::~DrawFrameTask() {
43}
44
45void DrawFrameTask::setContext(RenderThread* thread, CanvasContext* context) {
46    mRenderThread = thread;
47    mContext = context;
48}
49
50void DrawFrameTask::addLayer(DeferredLayerUpdater* layer) {
51    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to addLayer with!");
52
53    mLayers.push(layer);
54}
55
56void DrawFrameTask::removeLayer(DeferredLayerUpdater* layer) {
57    for (size_t i = 0; i < mLayers.size(); i++) {
58        if (mLayers[i] == layer) {
59            mLayers.removeAt(i);
60            break;
61        }
62    }
63}
64
65void DrawFrameTask::setDirty(int left, int top, int right, int bottom) {
66    mDirty.set(left, top, right, bottom);
67}
68
69int DrawFrameTask::drawFrame(nsecs_t frameTimeNanos, nsecs_t recordDurationNanos) {
70    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
71
72    mSyncResult = kSync_OK;
73    mFrameTimeNanos = frameTimeNanos;
74    mRecordDurationNanos = recordDurationNanos;
75    postAndWait();
76
77    // Reset the single-frame data
78    mFrameTimeNanos = 0;
79    mRecordDurationNanos = 0;
80    mDirty.setEmpty();
81
82    return mSyncResult;
83}
84
85void DrawFrameTask::postAndWait() {
86    AutoMutex _lock(mLock);
87    mRenderThread->queue(this);
88    mSignal.wait(mLock);
89}
90
91void DrawFrameTask::run() {
92    ATRACE_NAME("DrawFrame");
93
94    mContext->profiler().setDensity(mDensity);
95    mContext->profiler().startFrame(mRecordDurationNanos);
96
97    bool canUnblockUiThread;
98    bool canDrawThisFrame;
99    {
100        TreeInfo info;
101        canUnblockUiThread = syncFrameState(info);
102        canDrawThisFrame = info.out.canDrawThisFrame;
103    }
104
105    // Grab a copy of everything we need
106    Rect dirty(mDirty);
107    CanvasContext* context = mContext;
108
109    // From this point on anything in "this" is *UNSAFE TO ACCESS*
110    if (canUnblockUiThread) {
111        unblockUiThread();
112    }
113
114    if (CC_LIKELY(canDrawThisFrame)) {
115        context->draw(&dirty);
116    }
117
118    if (!canUnblockUiThread) {
119        unblockUiThread();
120    }
121}
122
123static void initTreeInfo(TreeInfo& info) {
124    info.prepareTextures = true;
125    info.performStagingPush = true;
126    info.evaluateAnimations = true;
127}
128
129bool DrawFrameTask::syncFrameState(TreeInfo& info) {
130    ATRACE_CALL();
131    mRenderThread->timeLord().vsyncReceived(mFrameTimeNanos);
132    mContext->makeCurrent();
133    Caches::getInstance().textureCache.resetMarkInUse();
134    initTreeInfo(info);
135    mContext->prepareDraw(&mLayers, info);
136    if (info.out.hasAnimations) {
137        // TODO: dirty calculations, for now just do a full-screen inval
138        mDirty.setEmpty();
139        if (info.out.requiresUiRedraw) {
140            mSyncResult |= kSync_UIRedrawRequired;
141        }
142    }
143    // If prepareTextures is false, we ran out of texture cache space
144    return !info.out.hasFunctors && info.prepareTextures;
145}
146
147void DrawFrameTask::unblockUiThread() {
148    AutoMutex _lock(mLock);
149    mSignal.signal();
150}
151
152} /* namespace renderthread */
153} /* namespace uirenderer */
154} /* namespace android */
155