DrawFrameTask.cpp revision 18f16e6fba74eda173e1e7c869e6e2e2acc073ff 
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(NULL) {
37}
38
39DrawFrameTask::~DrawFrameTask() {
40}
41
42void DrawFrameTask::setContext(RenderThread* thread, CanvasContext* context) {
43    mRenderThread = thread;
44    mContext = context;
45}
46
47void DrawFrameTask::addLayer(DeferredLayerUpdater* layer) {
48    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to addLayer with!");
49
50    mLayers.push(layer);
51}
52
53void DrawFrameTask::removeLayer(DeferredLayerUpdater* layer) {
54    for (size_t i = 0; i < mLayers.size(); i++) {
55        if (mLayers[i] == layer) {
56            mLayers.removeAt(i);
57            break;
58        }
59    }
60}
61
62void DrawFrameTask::setDirty(int left, int top, int right, int bottom) {
63    mDirty.set(left, top, right, bottom);
64}
65
66void DrawFrameTask::drawFrame(nsecs_t frameTimeNanos) {
67    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
68
69    mFrameTimeNanos = frameTimeNanos;
70    postAndWait();
71
72    // Reset the single-frame data
73    mFrameTimeNanos = 0;
74    mDirty.setEmpty();
75}
76
77void DrawFrameTask::postAndWait() {
78    AutoMutex _lock(mLock);
79    mRenderThread->queue(this);
80    mSignal.wait(mLock);
81}
82
83void DrawFrameTask::run() {
84    ATRACE_NAME("DrawFrame");
85
86    bool canUnblockUiThread = syncFrameState();
87
88    // Grab a copy of everything we need
89    Rect dirty(mDirty);
90    CanvasContext* context = mContext;
91
92    // From this point on anything in "this" is *UNSAFE TO ACCESS*
93    if (canUnblockUiThread) {
94        unblockUiThread();
95    }
96
97    context->draw(&dirty);
98
99    if (!canUnblockUiThread) {
100        unblockUiThread();
101    }
102}
103
104static void initTreeInfo(TreeInfo& info) {
105    info.prepareTextures = true;
106    info.performStagingPush = true;
107    info.evaluateAnimations = true;
108}
109
110bool DrawFrameTask::syncFrameState() {
111    ATRACE_CALL();
112    mRenderThread->timeLord().vsyncReceived(mFrameTimeNanos);
113    mContext->makeCurrent();
114    Caches::getInstance().textureCache.resetMarkInUse();
115    TreeInfo info;
116    initTreeInfo(info);
117    mContext->processLayerUpdates(&mLayers, info);
118    mContext->prepareTree(info);
119    if (info.hasAnimations) {
120        // TODO: dirty calculations, for now just do a full-screen inval
121        mDirty.setEmpty();
122    }
123    // If prepareTextures is false, we ran out of texture cache space
124    return !info.hasFunctors && info.prepareTextures;
125}
126
127void DrawFrameTask::unblockUiThread() {
128    AutoMutex _lock(mLock);
129    mSignal.signal();
130}
131
132} /* namespace renderthread */
133} /* namespace uirenderer */
134} /* namespace android */
135