DrawFrameTask.cpp revision f9be77940e365036fecd8cc0e491e8545c34e79b 
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 = syncFrameState();
91
92    // Grab a copy of everything we need
93    Rect dirty(mDirty);
94    CanvasContext* context = mContext;
95
96    // From this point on anything in "this" is *UNSAFE TO ACCESS*
97    if (canUnblockUiThread) {
98        unblockUiThread();
99    }
100
101    context->draw(&dirty);
102
103    if (!canUnblockUiThread) {
104        unblockUiThread();
105    }
106}
107
108static void initTreeInfo(TreeInfo& info) {
109    info.prepareTextures = true;
110    info.performStagingPush = true;
111    info.evaluateAnimations = true;
112}
113
114bool DrawFrameTask::syncFrameState() {
115    ATRACE_CALL();
116    mRenderThread->timeLord().vsyncReceived(mFrameTimeNanos);
117    mContext->makeCurrent();
118    Caches::getInstance().textureCache.resetMarkInUse();
119    TreeInfo info;
120    initTreeInfo(info);
121    mContext->prepareDraw(&mLayers, info);
122    if (info.out.hasAnimations) {
123        // TODO: dirty calculations, for now just do a full-screen inval
124        mDirty.setEmpty();
125        if (info.out.requiresUiRedraw) {
126            mSyncResult |= kSync_UIRedrawRequired;
127        }
128    }
129    // If prepareTextures is false, we ran out of texture cache space
130    return !info.out.hasFunctors && info.prepareTextures;
131}
132
133void DrawFrameTask::unblockUiThread() {
134    AutoMutex _lock(mLock);
135    mSignal.signal();
136}
137
138} /* namespace renderthread */
139} /* namespace uirenderer */
140} /* namespace android */
141