DrawFrameTask.cpp revision 8de65a8e05285df52a1e6f0c1d5616dd233298a7 
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), mTaskMode(MODE_INVALID), mRenderNode(0) {
34}
35
36DrawFrameTask::~DrawFrameTask() {
37}
38
39void DrawFrameTask::setContext(CanvasContext* context) {
40    mContext = context;
41}
42
43void DrawFrameTask::addLayer(DeferredLayerUpdater* layer) {
44    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to addLayer with!");
45
46    mLayers.push(layer);
47}
48
49void DrawFrameTask::removeLayer(DeferredLayerUpdater* layer) {
50    for (size_t i = 0; i < mLayers.size(); i++) {
51        if (mLayers[i] == layer) {
52            mLayers.removeAt(i);
53            break;
54        }
55    }
56}
57
58void DrawFrameTask::setRenderNode(RenderNode* renderNode) {
59    LOG_ALWAYS_FATAL_IF(!mContext, "Lifecycle violation, there's no context to setRenderNode with!");
60
61    mRenderNode = renderNode;
62}
63
64void DrawFrameTask::setDirty(int left, int top, int right, int bottom) {
65    mDirty.set(left, top, right, bottom);
66}
67
68void DrawFrameTask::drawFrame(RenderThread* renderThread) {
69    LOG_ALWAYS_FATAL_IF(!mRenderNode.get(), "Cannot drawFrame with no render node!");
70    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
71
72    postAndWait(renderThread, MODE_FULL);
73
74    // Reset the single-frame data
75    mDirty.setEmpty();
76    mRenderNode = 0;
77}
78
79void DrawFrameTask::flushStateChanges(RenderThread* renderThread) {
80    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
81
82    postAndWait(renderThread, MODE_STATE_ONLY);
83}
84
85void DrawFrameTask::postAndWait(RenderThread* renderThread, TaskMode mode) {
86    LOG_ALWAYS_FATAL_IF(mode == MODE_INVALID, "That's not a real mode, silly!");
87
88    mTaskMode = mode;
89    AutoMutex _lock(mLock);
90    renderThread->queue(this);
91    mSignal.wait(mLock);
92}
93
94void DrawFrameTask::run() {
95    ATRACE_NAME("DrawFrame");
96
97    syncFrameState();
98
99    if (mTaskMode == MODE_STATE_ONLY) {
100        unblockUiThread();
101        return;
102    }
103
104    // Grab a copy of everything we need
105    Rect dirtyCopy(mDirty);
106    sp<RenderNode> renderNode = mRenderNode;
107    CanvasContext* context = mContext;
108
109    // This is temporary until WebView has a solution for syncing frame state
110    bool canUnblockUiThread = !requiresSynchronousDraw(renderNode.get());
111
112    // From this point on anything in "this" is *UNSAFE TO ACCESS*
113    if (canUnblockUiThread) {
114        unblockUiThread();
115    }
116
117    drawRenderNode(context, renderNode.get(), &dirtyCopy);
118
119    if (!canUnblockUiThread) {
120        unblockUiThread();
121    }
122}
123
124void DrawFrameTask::syncFrameState() {
125    ATRACE_CALL();
126
127    mContext->processLayerUpdates(&mLayers);
128
129    // If we don't have an mRenderNode this is a state flush only
130    if (mRenderNode.get()) {
131        mRenderNode->pushStagingChanges();
132    }
133}
134
135void DrawFrameTask::unblockUiThread() {
136    AutoMutex _lock(mLock);
137    mSignal.signal();
138}
139
140void DrawFrameTask::drawRenderNode(CanvasContext* context, RenderNode* renderNode, Rect* dirty) {
141    ATRACE_CALL();
142
143    if (dirty->bottom == -1 && dirty->left == -1
144            && dirty->top == -1 && dirty->right == -1) {
145        dirty = 0;
146    }
147    context->drawDisplayList(renderNode, dirty);
148}
149
150bool DrawFrameTask::requiresSynchronousDraw(RenderNode* renderNode) {
151    return renderNode->hasFunctors();
152}
153
154} /* namespace renderthread */
155} /* namespace uirenderer */
156} /* namespace android */
157