DrawFrameTask.cpp revision 52244fff29042926e21fa897ef5ab11148e35299 
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) {
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::setDirty(int left, int top, int right, int bottom) {
59    mDirty.set(left, top, right, bottom);
60}
61
62void DrawFrameTask::drawFrame(RenderThread* renderThread) {
63    LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
64
65    postAndWait(renderThread);
66
67    // Reset the single-frame data
68    mDirty.setEmpty();
69}
70
71void DrawFrameTask::postAndWait(RenderThread* renderThread) {
72    AutoMutex _lock(mLock);
73    renderThread->queue(this);
74    mSignal.wait(mLock);
75}
76
77void DrawFrameTask::run() {
78    ATRACE_NAME("DrawFrame");
79
80    bool canUnblockUiThread = syncFrameState();
81
82    // Grab a copy of everything we need
83    Rect dirty(mDirty);
84    CanvasContext* context = mContext;
85
86    // From this point on anything in "this" is *UNSAFE TO ACCESS*
87    if (canUnblockUiThread) {
88        unblockUiThread();
89    }
90
91    context->draw(&dirty);
92
93    if (!canUnblockUiThread) {
94        unblockUiThread();
95    }
96}
97
98static void initTreeInfo(TreeInfo& info) {
99    info.prepareTextures = true;
100    info.performStagingPush = true;
101    info.evaluateAnimations = true;
102    // TODO: Get this from Choreographer
103    nsecs_t frameTimeNs = systemTime(CLOCK_MONOTONIC);
104    info.frameTimeMs = nanoseconds_to_milliseconds(frameTimeNs);
105}
106
107bool DrawFrameTask::syncFrameState() {
108    ATRACE_CALL();
109    mContext->makeCurrent();
110    Caches::getInstance().textureCache.resetMarkInUse();
111    TreeInfo info;
112    initTreeInfo(info);
113    mContext->processLayerUpdates(&mLayers, info);
114    mContext->prepareTree(info);
115    if (info.hasAnimations) {
116        // TODO: dirty calculations, for now just do a full-screen inval
117        mDirty.setEmpty();
118    }
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
128} /* namespace renderthread */
129} /* namespace uirenderer */
130} /* namespace android */
131