DrawFrameTask.cpp revision 668f0e38ef0277d55d3118af37e17b8c435df85c 
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() : mContext(0), mRenderNode(0) {
34}
35
36DrawFrameTask::~DrawFrameTask() {
37}
38
39void DrawFrameTask::setContext(CanvasContext* context) {
40    mContext = context;
41}
42
43void DrawFrameTask::setDisplayListData(RenderNode* renderNode, DisplayListData* newData) {
44    SetDisplayListData setter;
45    setter.targetNode = renderNode;
46    setter.newData = newData;
47    mDisplayListDataUpdates.push(setter);
48}
49
50void DrawFrameTask::addLayer(DeferredLayerUpdater* layer) {
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::setRenderNode(RenderNode* renderNode) {
64    mRenderNode = renderNode;
65}
66
67void DrawFrameTask::setDirty(int left, int top, int right, int bottom) {
68    mDirty.set(left, top, right, bottom);
69}
70
71void DrawFrameTask::drawFrame(RenderThread* renderThread) {
72    LOG_ALWAYS_FATAL_IF(!mRenderNode, "Cannot drawFrame with no render node!");
73    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
74
75    AutoMutex _lock(mLock);
76    renderThread->queue(this);
77    mSignal.wait(mLock);
78
79    // Reset the single-frame data
80    mDirty.setEmpty();
81    mRenderNode = 0;
82}
83
84void DrawFrameTask::run() {
85    ATRACE_NAME("DrawFrame");
86
87    syncFrameState();
88
89    // Grab a copy of everything we need
90    Rect dirtyCopy(mDirty);
91    RenderNode* renderNode = mRenderNode;
92    CanvasContext* context = mContext;
93
94    // This is temporary until WebView has a solution for syncing frame state
95    bool canUnblockUiThread = !requiresSynchronousDraw(renderNode);
96
97    // From this point on anything in "this" is *UNSAFE TO ACCESS*
98    if (canUnblockUiThread) {
99        unblockUiThread();
100    }
101
102    drawRenderNode(context, renderNode, &dirtyCopy);
103
104    if (!canUnblockUiThread) {
105        unblockUiThread();
106    }
107}
108
109void DrawFrameTask::syncFrameState() {
110    ATRACE_CALL();
111
112    for (size_t i = 0; i < mDisplayListDataUpdates.size(); i++) {
113        const SetDisplayListData& setter = mDisplayListDataUpdates[i];
114        setter.targetNode->setData(setter.newData);
115    }
116    mDisplayListDataUpdates.clear();
117
118    mContext->processLayerUpdates(&mLayers);
119    mRenderNode->updateProperties();
120}
121
122void DrawFrameTask::unblockUiThread() {
123    AutoMutex _lock(mLock);
124    mSignal.signal();
125}
126
127void DrawFrameTask::drawRenderNode(CanvasContext* context, RenderNode* renderNode, Rect* dirty) {
128    ATRACE_CALL();
129
130    if (dirty->bottom == -1 && dirty->left == -1
131            && dirty->top == -1 && dirty->right == -1) {
132        dirty = 0;
133    }
134    context->drawDisplayList(renderNode, dirty);
135}
136
137bool DrawFrameTask::requiresSynchronousDraw(RenderNode* renderNode) {
138    return renderNode->hasFunctors();
139}
140
141} /* namespace renderthread */
142} /* namespace uirenderer */
143} /* namespace android */
144