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      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 #include <GpuMemoryTracker.h>
     18 #include "CanvasContext.h"
     19 
     20 #include "AnimationContext.h"
     21 #include "Caches.h"
     22 #include "EglManager.h"
     23 #include "Frame.h"
     24 #include "LayerUpdateQueue.h"
     25 #include "Properties.h"
     26 #include "RenderThread.h"
     27 #include "hwui/Canvas.h"
     28 #include "renderstate/RenderState.h"
     29 #include "renderstate/Stencil.h"
     30 #include "protos/hwui.pb.h"
     31 #include "OpenGLPipeline.h"
     32 #include "pipeline/skia/SkiaOpenGLPipeline.h"
     33 #include "pipeline/skia/SkiaPipeline.h"
     34 #include "pipeline/skia/SkiaVulkanPipeline.h"
     35 #include "utils/GLUtils.h"
     36 #include "utils/TimeUtils.h"
     37 
     38 #include <cutils/properties.h>
     39 #include <google/protobuf/io/zero_copy_stream_impl.h>
     40 #include <private/hwui/DrawGlInfo.h>
     41 #include <strings.h>
     42 
     43 #include <algorithm>
     44 #include <fcntl.h>
     45 #include <sys/stat.h>
     46 
     47 #include <cstdlib>
     48 
     49 #define TRIM_MEMORY_COMPLETE 80
     50 #define TRIM_MEMORY_UI_HIDDEN 20
     51 
     52 #define ENABLE_RENDERNODE_SERIALIZATION false
     53 
     54 #define LOG_FRAMETIME_MMA 0
     55 
     56 #if LOG_FRAMETIME_MMA
     57 static float sBenchMma = 0;
     58 static int sFrameCount = 0;
     59 static const float NANOS_PER_MILLIS_F = 1000000.0f;
     60 #endif
     61 
     62 namespace android {
     63 namespace uirenderer {
     64 namespace renderthread {
     65 
     66 CanvasContext* CanvasContext::create(RenderThread& thread,
     67         bool translucent, RenderNode* rootRenderNode, IContextFactory* contextFactory) {
     68 
     69     auto renderType = Properties::getRenderPipelineType();
     70 
     71     switch (renderType) {
     72         case RenderPipelineType::OpenGL:
     73             return new CanvasContext(thread, translucent, rootRenderNode, contextFactory,
     74                     std::make_unique<OpenGLPipeline>(thread));
     75         case RenderPipelineType::SkiaGL:
     76             return new CanvasContext(thread, translucent, rootRenderNode, contextFactory,
     77                     std::make_unique<skiapipeline::SkiaOpenGLPipeline>(thread));
     78         case RenderPipelineType::SkiaVulkan:
     79             return new CanvasContext(thread, translucent, rootRenderNode, contextFactory,
     80                                 std::make_unique<skiapipeline::SkiaVulkanPipeline>(thread));
     81         default:
     82             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t) renderType);
     83             break;
     84     }
     85     return nullptr;
     86 }
     87 
     88 void CanvasContext::destroyLayer(RenderNode* node) {
     89     auto renderType = Properties::getRenderPipelineType();
     90     switch (renderType) {
     91         case RenderPipelineType::OpenGL:
     92             OpenGLPipeline::destroyLayer(node);
     93             break;
     94         case RenderPipelineType::SkiaGL:
     95         case RenderPipelineType::SkiaVulkan:
     96             skiapipeline::SkiaPipeline::destroyLayer(node);
     97             break;
     98         default:
     99             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t) renderType);
    100             break;
    101     }
    102 }
    103 
    104 void CanvasContext::invokeFunctor(const RenderThread& thread, Functor* functor) {
    105     ATRACE_CALL();
    106     auto renderType = Properties::getRenderPipelineType();
    107     switch (renderType) {
    108         case RenderPipelineType::OpenGL:
    109             OpenGLPipeline::invokeFunctor(thread, functor);
    110             break;
    111         case RenderPipelineType::SkiaGL:
    112             skiapipeline::SkiaOpenGLPipeline::invokeFunctor(thread, functor);
    113             break;
    114         case RenderPipelineType::SkiaVulkan:
    115             skiapipeline::SkiaVulkanPipeline::invokeFunctor(thread, functor);
    116             break;
    117         default:
    118             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t) renderType);
    119             break;
    120     }
    121 }
    122 
    123 void CanvasContext::prepareToDraw(const RenderThread& thread, Bitmap* bitmap) {
    124     auto renderType = Properties::getRenderPipelineType();
    125     switch (renderType) {
    126         case RenderPipelineType::OpenGL:
    127             OpenGLPipeline::prepareToDraw(thread, bitmap);
    128             break;
    129         case RenderPipelineType::SkiaGL:
    130         case RenderPipelineType::SkiaVulkan:
    131             skiapipeline::SkiaPipeline::prepareToDraw(thread, bitmap);
    132             break;
    133         default:
    134             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t) renderType);
    135             break;
    136     }
    137 }
    138 
    139 CanvasContext::CanvasContext(RenderThread& thread, bool translucent,
    140         RenderNode* rootRenderNode, IContextFactory* contextFactory,
    141         std::unique_ptr<IRenderPipeline> renderPipeline)
    142         : mRenderThread(thread)
    143         , mOpaque(!translucent)
    144         , mAnimationContext(contextFactory->createAnimationContext(mRenderThread.timeLord()))
    145         , mJankTracker(thread.mainDisplayInfo())
    146         , mProfiler(mFrames)
    147         , mContentDrawBounds(0, 0, 0, 0)
    148         , mRenderPipeline(std::move(renderPipeline)) {
    149     rootRenderNode->makeRoot();
    150     mRenderNodes.emplace_back(rootRenderNode);
    151     mRenderThread.renderState().registerCanvasContext(this);
    152     mProfiler.setDensity(mRenderThread.mainDisplayInfo().density);
    153 }
    154 
    155 CanvasContext::~CanvasContext() {
    156     destroy();
    157     mRenderThread.renderState().unregisterCanvasContext(this);
    158     for (auto& node : mRenderNodes) {
    159         node->clearRoot();
    160     }
    161     mRenderNodes.clear();
    162 }
    163 
    164 void CanvasContext::addRenderNode(RenderNode* node, bool placeFront) {
    165     int pos = placeFront ? 0 : static_cast<int>(mRenderNodes.size());
    166     node->makeRoot();
    167     mRenderNodes.emplace(mRenderNodes.begin() + pos, node);
    168 }
    169 
    170 void CanvasContext::removeRenderNode(RenderNode* node) {
    171     node->clearRoot();
    172     mRenderNodes.erase(std::remove(mRenderNodes.begin(), mRenderNodes.end(), node),
    173             mRenderNodes.end());
    174 }
    175 
    176 void CanvasContext::destroy() {
    177     stopDrawing();
    178     setSurface(nullptr);
    179     freePrefetchedLayers();
    180     destroyHardwareResources();
    181     mAnimationContext->destroy();
    182 }
    183 
    184 void CanvasContext::setSurface(Surface* surface) {
    185     ATRACE_CALL();
    186 
    187     mNativeSurface = surface;
    188 
    189     bool hasSurface = mRenderPipeline->setSurface(surface, mSwapBehavior);
    190 
    191     mFrameNumber = -1;
    192 
    193     if (hasSurface) {
    194          mHaveNewSurface = true;
    195          mSwapHistory.clear();
    196     } else {
    197          mRenderThread.removeFrameCallback(this);
    198     }
    199 }
    200 
    201 void CanvasContext::setSwapBehavior(SwapBehavior swapBehavior) {
    202     mSwapBehavior = swapBehavior;
    203 }
    204 
    205 void CanvasContext::initialize(Surface* surface) {
    206     setSurface(surface);
    207 }
    208 
    209 void CanvasContext::updateSurface(Surface* surface) {
    210     setSurface(surface);
    211 }
    212 
    213 bool CanvasContext::pauseSurface(Surface* surface) {
    214     return mRenderThread.removeFrameCallback(this);
    215 }
    216 
    217 void CanvasContext::setStopped(bool stopped) {
    218     if (mStopped != stopped) {
    219         mStopped = stopped;
    220         if (mStopped) {
    221             mRenderThread.removeFrameCallback(this);
    222             mRenderPipeline->onStop();
    223         } else if (mIsDirty && hasSurface()) {
    224             mRenderThread.postFrameCallback(this);
    225         }
    226     }
    227 }
    228 
    229 void CanvasContext::setup(float lightRadius,
    230         uint8_t ambientShadowAlpha, uint8_t spotShadowAlpha) {
    231     mLightGeometry.radius = lightRadius;
    232     mLightInfo.ambientShadowAlpha = ambientShadowAlpha;
    233     mLightInfo.spotShadowAlpha = spotShadowAlpha;
    234 }
    235 
    236 void CanvasContext::setLightCenter(const Vector3& lightCenter) {
    237     mLightGeometry.center = lightCenter;
    238 }
    239 
    240 void CanvasContext::setOpaque(bool opaque) {
    241     mOpaque = opaque;
    242 }
    243 
    244 bool CanvasContext::makeCurrent() {
    245     if (mStopped) return false;
    246 
    247     auto result = mRenderPipeline->makeCurrent();
    248     switch (result) {
    249         case MakeCurrentResult::AlreadyCurrent:
    250             return true;
    251         case MakeCurrentResult::Failed:
    252             mHaveNewSurface = true;
    253             setSurface(nullptr);
    254             return false;
    255         case MakeCurrentResult::Succeeded:
    256             mHaveNewSurface = true;
    257             return true;
    258         default:
    259             LOG_ALWAYS_FATAL("unexpected result %d from IRenderPipeline::makeCurrent",
    260                     (int32_t) result);
    261     }
    262 
    263     return true;
    264 }
    265 
    266 static bool wasSkipped(FrameInfo* info) {
    267     return info && ((*info)[FrameInfoIndex::Flags] & FrameInfoFlags::SkippedFrame);
    268 }
    269 
    270 bool CanvasContext::isSwapChainStuffed() {
    271     static const auto SLOW_THRESHOLD = 6_ms;
    272 
    273     if (mSwapHistory.size() != mSwapHistory.capacity()) {
    274         // We want at least 3 frames of history before attempting to
    275         // guess if the queue is stuffed
    276         return false;
    277     }
    278     nsecs_t frameInterval = mRenderThread.timeLord().frameIntervalNanos();
    279     auto& swapA = mSwapHistory[0];
    280 
    281     // Was there a happy queue & dequeue time? If so, don't
    282     // consider it stuffed
    283     if (swapA.dequeueDuration < SLOW_THRESHOLD
    284             && swapA.queueDuration < SLOW_THRESHOLD) {
    285         return false;
    286     }
    287 
    288     for (size_t i = 1; i < mSwapHistory.size(); i++) {
    289         auto& swapB = mSwapHistory[i];
    290 
    291         // If there's a multi-frameInterval gap we effectively already dropped a frame,
    292         // so consider the queue healthy.
    293         if (swapA.swapCompletedTime - swapB.swapCompletedTime > frameInterval * 3) {
    294             return false;
    295         }
    296 
    297         // Was there a happy queue & dequeue time? If so, don't
    298         // consider it stuffed
    299         if (swapB.dequeueDuration < SLOW_THRESHOLD
    300                 && swapB.queueDuration < SLOW_THRESHOLD) {
    301             return false;
    302         }
    303 
    304         swapA = swapB;
    305     }
    306 
    307     // All signs point to a stuffed swap chain
    308     ATRACE_NAME("swap chain stuffed");
    309     return true;
    310 }
    311 
    312 void CanvasContext::prepareTree(TreeInfo& info, int64_t* uiFrameInfo,
    313         int64_t syncQueued, RenderNode* target) {
    314     mRenderThread.removeFrameCallback(this);
    315 
    316     // If the previous frame was dropped we don't need to hold onto it, so
    317     // just keep using the previous frame's structure instead
    318     if (!wasSkipped(mCurrentFrameInfo)) {
    319         mCurrentFrameInfo = &mFrames.next();
    320     }
    321     mCurrentFrameInfo->importUiThreadInfo(uiFrameInfo);
    322     mCurrentFrameInfo->set(FrameInfoIndex::SyncQueued) = syncQueued;
    323     mCurrentFrameInfo->markSyncStart();
    324 
    325     info.damageAccumulator = &mDamageAccumulator;
    326     info.layerUpdateQueue = &mLayerUpdateQueue;
    327 
    328     mAnimationContext->startFrame(info.mode);
    329     for (const sp<RenderNode>& node : mRenderNodes) {
    330         // Only the primary target node will be drawn full - all other nodes would get drawn in
    331         // real time mode. In case of a window, the primary node is the window content and the other
    332         // node(s) are non client / filler nodes.
    333         info.mode = (node.get() == target ? TreeInfo::MODE_FULL : TreeInfo::MODE_RT_ONLY);
    334         node->prepareTree(info);
    335         GL_CHECKPOINT(MODERATE);
    336     }
    337     mAnimationContext->runRemainingAnimations(info);
    338     GL_CHECKPOINT(MODERATE);
    339 
    340     freePrefetchedLayers();
    341     GL_CHECKPOINT(MODERATE);
    342 
    343     mIsDirty = true;
    344 
    345     if (CC_UNLIKELY(!mNativeSurface.get())) {
    346         mCurrentFrameInfo->addFlag(FrameInfoFlags::SkippedFrame);
    347         info.out.canDrawThisFrame = false;
    348         return;
    349     }
    350 
    351     if (CC_LIKELY(mSwapHistory.size() && !Properties::forceDrawFrame)) {
    352         nsecs_t latestVsync = mRenderThread.timeLord().latestVsync();
    353         SwapHistory& lastSwap = mSwapHistory.back();
    354         nsecs_t vsyncDelta = std::abs(lastSwap.vsyncTime - latestVsync);
    355         // The slight fudge-factor is to deal with cases where
    356         // the vsync was estimated due to being slow handling the signal.
    357         // See the logic in TimeLord#computeFrameTimeNanos or in
    358         // Choreographer.java for details on when this happens
    359         if (vsyncDelta < 2_ms) {
    360             // Already drew for this vsync pulse, UI draw request missed
    361             // the deadline for RT animations
    362             info.out.canDrawThisFrame = false;
    363         } else if (vsyncDelta >= mRenderThread.timeLord().frameIntervalNanos() * 3
    364                 || (latestVsync - mLastDropVsync) < 500_ms) {
    365             // It's been several frame intervals, assume the buffer queue is fine
    366             // or the last drop was too recent
    367             info.out.canDrawThisFrame = true;
    368         } else {
    369             info.out.canDrawThisFrame = !isSwapChainStuffed();
    370             if (!info.out.canDrawThisFrame) {
    371                 // dropping frame
    372                 mLastDropVsync = mRenderThread.timeLord().latestVsync();
    373             }
    374         }
    375     } else {
    376         info.out.canDrawThisFrame = true;
    377     }
    378 
    379     if (!info.out.canDrawThisFrame) {
    380         mCurrentFrameInfo->addFlag(FrameInfoFlags::SkippedFrame);
    381     }
    382 
    383     if (info.out.hasAnimations || !info.out.canDrawThisFrame) {
    384         if (!info.out.requiresUiRedraw) {
    385             // If animationsNeedsRedraw is set don't bother posting for an RT anim
    386             // as we will just end up fighting the UI thread.
    387             mRenderThread.postFrameCallback(this);
    388         }
    389     }
    390 }
    391 
    392 void CanvasContext::stopDrawing() {
    393     mRenderThread.removeFrameCallback(this);
    394     mAnimationContext->pauseAnimators();
    395 }
    396 
    397 void CanvasContext::notifyFramePending() {
    398     ATRACE_CALL();
    399     mRenderThread.pushBackFrameCallback(this);
    400 }
    401 
    402 void CanvasContext::draw() {
    403     SkRect dirty;
    404     mDamageAccumulator.finish(&dirty);
    405 
    406     // TODO: Re-enable after figuring out cause of b/22592975
    407 //    if (dirty.isEmpty() && Properties::skipEmptyFrames) {
    408 //        mCurrentFrameInfo->addFlag(FrameInfoFlags::SkippedFrame);
    409 //        return;
    410 //    }
    411 
    412     mCurrentFrameInfo->markIssueDrawCommandsStart();
    413 
    414     Frame frame = mRenderPipeline->getFrame();
    415 
    416     SkRect windowDirty = computeDirtyRect(frame, &dirty);
    417 
    418     bool drew = mRenderPipeline->draw(frame, windowDirty, dirty, mLightGeometry, &mLayerUpdateQueue,
    419             mContentDrawBounds, mOpaque, mLightInfo, mRenderNodes, &(profiler()));
    420 
    421     waitOnFences();
    422 
    423     bool requireSwap = false;
    424     bool didSwap = mRenderPipeline->swapBuffers(frame, drew, windowDirty, mCurrentFrameInfo,
    425             &requireSwap);
    426 
    427     mIsDirty = false;
    428 
    429     if (requireSwap) {
    430         if (!didSwap) { //some error happened
    431             setSurface(nullptr);
    432         }
    433         SwapHistory& swap = mSwapHistory.next();
    434         swap.damage = windowDirty;
    435         swap.swapCompletedTime = systemTime(CLOCK_MONOTONIC);
    436         swap.vsyncTime = mRenderThread.timeLord().latestVsync();
    437         if (mNativeSurface.get()) {
    438             int durationUs;
    439             nsecs_t dequeueStart = mNativeSurface->getLastDequeueStartTime();
    440             if (dequeueStart < mCurrentFrameInfo->get(FrameInfoIndex::SyncStart)) {
    441                 // Ignoring dequeue duration as it happened prior to frame render start
    442                 // and thus is not part of the frame.
    443                 swap.dequeueDuration = 0;
    444             } else {
    445                 mNativeSurface->query(NATIVE_WINDOW_LAST_DEQUEUE_DURATION, &durationUs);
    446                 swap.dequeueDuration = us2ns(durationUs);
    447             }
    448             mNativeSurface->query(NATIVE_WINDOW_LAST_QUEUE_DURATION, &durationUs);
    449             swap.queueDuration = us2ns(durationUs);
    450         } else {
    451             swap.dequeueDuration = 0;
    452             swap.queueDuration = 0;
    453         }
    454         mCurrentFrameInfo->set(FrameInfoIndex::DequeueBufferDuration)
    455                 = swap.dequeueDuration;
    456         mCurrentFrameInfo->set(FrameInfoIndex::QueueBufferDuration)
    457                 = swap.queueDuration;
    458         mHaveNewSurface = false;
    459         mFrameNumber = -1;
    460     } else {
    461         mCurrentFrameInfo->set(FrameInfoIndex::DequeueBufferDuration) = 0;
    462         mCurrentFrameInfo->set(FrameInfoIndex::QueueBufferDuration) = 0;
    463     }
    464 
    465     // TODO: Use a fence for real completion?
    466     mCurrentFrameInfo->markFrameCompleted();
    467 
    468 #if LOG_FRAMETIME_MMA
    469     float thisFrame = mCurrentFrameInfo->duration(
    470             FrameInfoIndex::IssueDrawCommandsStart,
    471             FrameInfoIndex::FrameCompleted) / NANOS_PER_MILLIS_F;
    472     if (sFrameCount) {
    473         sBenchMma = ((9 * sBenchMma) + thisFrame) / 10;
    474     } else {
    475         sBenchMma = thisFrame;
    476     }
    477     if (++sFrameCount == 10) {
    478         sFrameCount = 1;
    479         ALOGD("Average frame time: %.4f", sBenchMma);
    480     }
    481 #endif
    482 
    483     mJankTracker.addFrame(*mCurrentFrameInfo);
    484     mRenderThread.jankTracker().addFrame(*mCurrentFrameInfo);
    485     if (CC_UNLIKELY(mFrameMetricsReporter.get() != nullptr)) {
    486         mFrameMetricsReporter->reportFrameMetrics(mCurrentFrameInfo->data());
    487     }
    488 
    489     GpuMemoryTracker::onFrameCompleted();
    490 #ifdef BUGREPORT_FONT_CACHE_USAGE
    491     auto renderType = Properties::getRenderPipelineType();
    492     if (RenderPipelineType::OpenGL == renderType) {
    493         Caches& caches = Caches::getInstance();
    494         caches.fontRenderer.getFontRenderer().historyTracker().frameCompleted();
    495     }
    496 #endif
    497 
    498 }
    499 
    500 // Called by choreographer to do an RT-driven animation
    501 void CanvasContext::doFrame() {
    502     if (!mRenderPipeline->isSurfaceReady()) return;
    503     prepareAndDraw(nullptr);
    504 }
    505 
    506 void CanvasContext::prepareAndDraw(RenderNode* node) {
    507     ATRACE_CALL();
    508 
    509     nsecs_t vsync = mRenderThread.timeLord().computeFrameTimeNanos();
    510     int64_t frameInfo[UI_THREAD_FRAME_INFO_SIZE];
    511     UiFrameInfoBuilder(frameInfo)
    512         .addFlag(FrameInfoFlags::RTAnimation)
    513         .setVsync(vsync, vsync);
    514 
    515     TreeInfo info(TreeInfo::MODE_RT_ONLY, *this);
    516     prepareTree(info, frameInfo, systemTime(CLOCK_MONOTONIC), node);
    517     if (info.out.canDrawThisFrame) {
    518         draw();
    519     } else {
    520         // wait on fences so tasks don't overlap next frame
    521         waitOnFences();
    522     }
    523 }
    524 
    525 void CanvasContext::markLayerInUse(RenderNode* node) {
    526     if (mPrefetchedLayers.erase(node)) {
    527         node->decStrong(nullptr);
    528     }
    529 }
    530 
    531 void CanvasContext::freePrefetchedLayers() {
    532     if (mPrefetchedLayers.size()) {
    533         for (auto& node : mPrefetchedLayers) {
    534             ALOGW("Incorrectly called buildLayer on View: %s, destroying layer...",
    535                     node->getName());
    536             node->destroyLayers();
    537             node->decStrong(nullptr);
    538         }
    539         mPrefetchedLayers.clear();
    540     }
    541 }
    542 
    543 void CanvasContext::buildLayer(RenderNode* node) {
    544     ATRACE_CALL();
    545     if (!mRenderPipeline->isContextReady()) return;
    546 
    547     // buildLayer() will leave the tree in an unknown state, so we must stop drawing
    548     stopDrawing();
    549 
    550     TreeInfo info(TreeInfo::MODE_FULL, *this);
    551     info.damageAccumulator = &mDamageAccumulator;
    552     info.layerUpdateQueue = &mLayerUpdateQueue;
    553     info.runAnimations = false;
    554     node->prepareTree(info);
    555     SkRect ignore;
    556     mDamageAccumulator.finish(&ignore);
    557     // Tickle the GENERIC property on node to mark it as dirty for damaging
    558     // purposes when the frame is actually drawn
    559     node->setPropertyFieldsDirty(RenderNode::GENERIC);
    560 
    561     mRenderPipeline->renderLayers(mLightGeometry, &mLayerUpdateQueue, mOpaque, mLightInfo);
    562 
    563     node->incStrong(nullptr);
    564     mPrefetchedLayers.insert(node);
    565 }
    566 
    567 bool CanvasContext::copyLayerInto(DeferredLayerUpdater* layer, SkBitmap* bitmap) {
    568     return mRenderPipeline->copyLayerInto(layer, bitmap);
    569 }
    570 
    571 void CanvasContext::destroyHardwareResources() {
    572     stopDrawing();
    573     if (mRenderPipeline->isContextReady()) {
    574         freePrefetchedLayers();
    575         for (const sp<RenderNode>& node : mRenderNodes) {
    576             node->destroyHardwareResources();
    577         }
    578         mRenderPipeline->onDestroyHardwareResources();
    579     }
    580 }
    581 
    582 void CanvasContext::trimMemory(RenderThread& thread, int level) {
    583     // No context means nothing to free
    584     if (!thread.eglManager().hasEglContext()) return;
    585 
    586     ATRACE_CALL();
    587     if (level >= TRIM_MEMORY_COMPLETE) {
    588         thread.renderState().flush(Caches::FlushMode::Full);
    589         thread.eglManager().destroy();
    590     } else if (level >= TRIM_MEMORY_UI_HIDDEN) {
    591         thread.renderState().flush(Caches::FlushMode::Moderate);
    592     }
    593 }
    594 
    595 DeferredLayerUpdater* CanvasContext::createTextureLayer() {
    596     return mRenderPipeline->createTextureLayer();
    597 }
    598 
    599 void CanvasContext::dumpFrames(int fd) {
    600     mJankTracker.dump(fd);
    601     FILE* file = fdopen(fd, "a");
    602     fprintf(file, "\n\n---PROFILEDATA---\n");
    603     for (size_t i = 0; i < static_cast<size_t>(FrameInfoIndex::NumIndexes); i++) {
    604         fprintf(file, "%s", FrameInfoNames[i].c_str());
    605         fprintf(file, ",");
    606     }
    607     for (size_t i = 0; i < mFrames.size(); i++) {
    608         FrameInfo& frame = mFrames[i];
    609         if (frame[FrameInfoIndex::SyncStart] == 0) {
    610             continue;
    611         }
    612         fprintf(file, "\n");
    613         for (int i = 0; i < static_cast<int>(FrameInfoIndex::NumIndexes); i++) {
    614             fprintf(file, "%" PRId64 ",", frame[i]);
    615         }
    616     }
    617     fprintf(file, "\n---PROFILEDATA---\n\n");
    618     fflush(file);
    619 }
    620 
    621 void CanvasContext::resetFrameStats() {
    622     mFrames.clear();
    623     mRenderThread.jankTracker().reset();
    624 }
    625 
    626 void CanvasContext::setName(const std::string&& name) {
    627     mJankTracker.setDescription(JankTrackerType::Window, std::move(name));
    628 }
    629 
    630 void CanvasContext::serializeDisplayListTree() {
    631 #if ENABLE_RENDERNODE_SERIALIZATION
    632     using namespace google::protobuf::io;
    633     char package[128];
    634     // Check whether tracing is enabled for this process.
    635     FILE * file = fopen("/proc/self/cmdline", "r");
    636     if (file) {
    637         if (!fgets(package, 128, file)) {
    638             ALOGE("Error reading cmdline: %s (%d)", strerror(errno), errno);
    639             fclose(file);
    640             return;
    641         }
    642         fclose(file);
    643     } else {
    644         ALOGE("Error opening /proc/self/cmdline: %s (%d)", strerror(errno),
    645                 errno);
    646         return;
    647     }
    648     char path[1024];
    649     snprintf(path, 1024, "/data/data/%s/cache/rendertree_dump", package);
    650     int fd = open(path, O_CREAT | O_WRONLY, S_IRWXU | S_IRGRP | S_IROTH);
    651     if (fd == -1) {
    652         ALOGD("Failed to open '%s'", path);
    653         return;
    654     }
    655     proto::RenderNode tree;
    656     // TODO: Streaming writes?
    657     mRootRenderNode->copyTo(&tree);
    658     std::string data = tree.SerializeAsString();
    659     write(fd, data.c_str(), data.length());
    660     close(fd);
    661 #endif
    662 }
    663 
    664 void CanvasContext::waitOnFences() {
    665     if (mFrameFences.size()) {
    666         ATRACE_CALL();
    667         for (auto& fence : mFrameFences) {
    668             fence->getResult();
    669         }
    670         mFrameFences.clear();
    671     }
    672 }
    673 
    674 class CanvasContext::FuncTaskProcessor : public TaskProcessor<bool> {
    675 public:
    676     explicit FuncTaskProcessor(TaskManager* taskManager)
    677             : TaskProcessor<bool>(taskManager) {}
    678 
    679     virtual void onProcess(const sp<Task<bool> >& task) override {
    680         FuncTask* t = static_cast<FuncTask*>(task.get());
    681         t->func();
    682         task->setResult(true);
    683     }
    684 };
    685 
    686 void CanvasContext::enqueueFrameWork(std::function<void()>&& func) {
    687     if (!mFrameWorkProcessor.get()) {
    688         mFrameWorkProcessor = new FuncTaskProcessor(mRenderPipeline->getTaskManager());
    689     }
    690     sp<FuncTask> task(new FuncTask());
    691     task->func = func;
    692     mFrameFences.push_back(task);
    693     mFrameWorkProcessor->add(task);
    694 }
    695 
    696 int64_t CanvasContext::getFrameNumber() {
    697     // mFrameNumber is reset to -1 when the surface changes or we swap buffers
    698     if (mFrameNumber == -1 && mNativeSurface.get()) {
    699         mFrameNumber = static_cast<int64_t>(mNativeSurface->getNextFrameNumber());
    700     }
    701     return mFrameNumber;
    702 }
    703 
    704 SkRect CanvasContext::computeDirtyRect(const Frame& frame, SkRect* dirty) {
    705     if (frame.width() != mLastFrameWidth || frame.height() != mLastFrameHeight) {
    706         // can't rely on prior content of window if viewport size changes
    707         dirty->setEmpty();
    708         mLastFrameWidth = frame.width();
    709         mLastFrameHeight = frame.height();
    710     } else if (mHaveNewSurface || frame.bufferAge() == 0) {
    711         // New surface needs a full draw
    712         dirty->setEmpty();
    713     } else {
    714         if (!dirty->isEmpty() && !dirty->intersect(0, 0, frame.width(), frame.height())) {
    715             ALOGW("Dirty " RECT_STRING " doesn't intersect with 0 0 %d %d ?",
    716                     SK_RECT_ARGS(*dirty), frame.width(), frame.height());
    717             dirty->setEmpty();
    718         }
    719         profiler().unionDirty(dirty);
    720     }
    721 
    722     if (dirty->isEmpty()) {
    723         dirty->set(0, 0, frame.width(), frame.height());
    724     }
    725 
    726     // At this point dirty is the area of the window to update. However,
    727     // the area of the frame we need to repaint is potentially different, so
    728     // stash the screen area for later
    729     SkRect windowDirty(*dirty);
    730 
    731     // If the buffer age is 0 we do a full-screen repaint (handled above)
    732     // If the buffer age is 1 the buffer contents are the same as they were
    733     // last frame so there's nothing to union() against
    734     // Therefore we only care about the > 1 case.
    735     if (frame.bufferAge() > 1) {
    736         if (frame.bufferAge() > (int) mSwapHistory.size()) {
    737             // We don't have enough history to handle this old of a buffer
    738             // Just do a full-draw
    739             dirty->set(0, 0, frame.width(), frame.height());
    740         } else {
    741             // At this point we haven't yet added the latest frame
    742             // to the damage history (happens below)
    743             // So we need to damage
    744             for (int i = mSwapHistory.size() - 1;
    745                     i > ((int) mSwapHistory.size()) - frame.bufferAge(); i--) {
    746                 dirty->join(mSwapHistory[i].damage);
    747             }
    748         }
    749     }
    750 
    751     return windowDirty;
    752 }
    753 
    754 } /* namespace renderthread */
    755 } /* namespace uirenderer */
    756 } /* namespace android */
    757