DrawFrameTask.cpp revision 860d155f866cc15a725e7ce03763280987f24901 
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::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);
73
74    // Reset the single-frame data
75    mDirty.setEmpty();
76    mRenderNode = 0;
77}
78
79void DrawFrameTask::postAndWait(RenderThread* renderThread) {
80    AutoMutex _lock(mLock);
81    renderThread->queue(this);
82    mSignal.wait(mLock);
83}
84
85void DrawFrameTask::run() {
86    ATRACE_NAME("DrawFrame");
87
88    bool canUnblockUiThread = syncFrameState();
89
90    // Grab a copy of everything we need
91    Rect dirtyCopy(mDirty);
92    sp<RenderNode> renderNode = mRenderNode;
93    CanvasContext* context = mContext;
94
95    // From this point on anything in "this" is *UNSAFE TO ACCESS*
96    if (canUnblockUiThread) {
97        unblockUiThread();
98    }
99
100    drawRenderNode(context, renderNode.get(), &dirtyCopy);
101
102    if (!canUnblockUiThread) {
103        unblockUiThread();
104    }
105}
106
107static void prepareTreeInfo(TreeInfo& info) {
108    info.prepareTextures = true;
109}
110
111bool DrawFrameTask::syncFrameState() {
112    ATRACE_CALL();
113    mContext->makeCurrent();
114    Caches::getInstance().textureCache.resetMarkInUse();
115    TreeInfo info;
116    prepareTreeInfo(info);
117    mContext->processLayerUpdates(&mLayers, info);
118    mRenderNode->prepareTree(info);
119    // If prepareTextures is false, we ran out of texture cache space
120    return !info.hasFunctors && info.prepareTextures;
121}
122
123void DrawFrameTask::unblockUiThread() {
124    AutoMutex _lock(mLock);
125    mSignal.signal();
126}
127
128void DrawFrameTask::drawRenderNode(CanvasContext* context, RenderNode* renderNode, Rect* dirty) {
129    ATRACE_CALL();
130
131    if (dirty->bottom == -1 && dirty->left == -1
132            && dirty->top == -1 && dirty->right == -1) {
133        dirty = 0;
134    }
135    context->drawDisplayList(renderNode, dirty);
136}
137
138} /* namespace renderthread */
139} /* namespace uirenderer */
140} /* namespace android */
141