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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 "CanvasContext.h"
     18 #include <GpuMemoryTracker.h>
     19 
     20 #include "AnimationContext.h"
     21 #include "Caches.h"
     22 #include "EglManager.h"
     23 #include "Frame.h"
     24 #include "LayerUpdateQueue.h"
     25 #include "OpenGLPipeline.h"
     26 #include "Properties.h"
     27 #include "RenderThread.h"
     28 #include "hwui/Canvas.h"
     29 #include "pipeline/skia/SkiaOpenGLPipeline.h"
     30 #include "pipeline/skia/SkiaPipeline.h"
     31 #include "pipeline/skia/SkiaVulkanPipeline.h"
     32 #include "protos/hwui.pb.h"
     33 #include "renderstate/RenderState.h"
     34 #include "renderstate/Stencil.h"
     35 #include "utils/GLUtils.h"
     36 #include "utils/TimeUtils.h"
     37 #include "../Properties.h"
     38 
     39 #include <cutils/properties.h>
     40 #include <google/protobuf/io/zero_copy_stream_impl.h>
     41 #include <private/hwui/DrawGlInfo.h>
     42 #include <strings.h>
     43 
     44 #include <fcntl.h>
     45 #include <sys/stat.h>
     46 #include <algorithm>
     47 
     48 #include <cstdlib>
     49 #include <functional>
     50 
     51 #define TRIM_MEMORY_COMPLETE 80
     52 #define TRIM_MEMORY_UI_HIDDEN 20
     53 
     54 #define ENABLE_RENDERNODE_SERIALIZATION false
     55 
     56 #define LOG_FRAMETIME_MMA 0
     57 
     58 #if LOG_FRAMETIME_MMA
     59 static float sBenchMma = 0;
     60 static int sFrameCount = 0;
     61 static const float NANOS_PER_MILLIS_F = 1000000.0f;
     62 #endif
     63 
     64 namespace android {
     65 namespace uirenderer {
     66 namespace renderthread {
     67 
     68 CanvasContext* CanvasContext::create(RenderThread& thread, bool translucent,
     69                                      RenderNode* rootRenderNode, IContextFactory* contextFactory) {
     70     auto renderType = Properties::getRenderPipelineType();
     71 
     72     switch (renderType) {
     73         case RenderPipelineType::OpenGL:
     74             return new CanvasContext(thread, translucent, rootRenderNode, contextFactory,
     75                                      std::make_unique<OpenGLPipeline>(thread));
     76         case RenderPipelineType::SkiaGL:
     77             return new CanvasContext(thread, translucent, rootRenderNode, contextFactory,
     78                                      std::make_unique<skiapipeline::SkiaOpenGLPipeline>(thread));
     79         case RenderPipelineType::SkiaVulkan:
     80             return new CanvasContext(thread, translucent, rootRenderNode, contextFactory,
     81                                      std::make_unique<skiapipeline::SkiaVulkanPipeline>(thread));
     82         default:
     83             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t)renderType);
     84             break;
     85     }
     86     return nullptr;
     87 }
     88 
     89 void CanvasContext::destroyLayer(RenderNode* node) {
     90     auto renderType = Properties::getRenderPipelineType();
     91     switch (renderType) {
     92         case RenderPipelineType::OpenGL:
     93             OpenGLPipeline::destroyLayer(node);
     94             break;
     95         case RenderPipelineType::SkiaGL:
     96         case RenderPipelineType::SkiaVulkan:
     97             skiapipeline::SkiaPipeline::destroyLayer(node);
     98             break;
     99         default:
    100             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t)renderType);
    101             break;
    102     }
    103 }
    104 
    105 void CanvasContext::invokeFunctor(const RenderThread& thread, Functor* functor) {
    106     ATRACE_CALL();
    107     auto renderType = Properties::getRenderPipelineType();
    108     switch (renderType) {
    109         case RenderPipelineType::OpenGL:
    110             OpenGLPipeline::invokeFunctor(thread, functor);
    111             break;
    112         case RenderPipelineType::SkiaGL:
    113             skiapipeline::SkiaOpenGLPipeline::invokeFunctor(thread, functor);
    114             break;
    115         case RenderPipelineType::SkiaVulkan:
    116             skiapipeline::SkiaVulkanPipeline::invokeFunctor(thread, functor);
    117             break;
    118         default:
    119             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t)renderType);
    120             break;
    121     }
    122 }
    123 
    124 void CanvasContext::prepareToDraw(const RenderThread& thread, Bitmap* bitmap) {
    125     auto renderType = Properties::getRenderPipelineType();
    126     switch (renderType) {
    127         case RenderPipelineType::OpenGL:
    128             OpenGLPipeline::prepareToDraw(thread, bitmap);
    129             break;
    130         case RenderPipelineType::SkiaGL:
    131         case RenderPipelineType::SkiaVulkan:
    132             skiapipeline::SkiaPipeline::prepareToDraw(thread, bitmap);
    133             break;
    134         default:
    135             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t)renderType);
    136             break;
    137     }
    138 }
    139 
    140 CanvasContext::CanvasContext(RenderThread& thread, bool translucent, RenderNode* rootRenderNode,
    141                              IContextFactory* contextFactory,
    142                              std::unique_ptr<IRenderPipeline> renderPipeline)
    143         : mRenderThread(thread)
    144         , mGenerationID(0)
    145         , mOpaque(!translucent)
    146         , mAnimationContext(contextFactory->createAnimationContext(mRenderThread.timeLord()))
    147         , mJankTracker(&thread.globalProfileData(), thread.mainDisplayInfo())
    148         , mProfiler(mJankTracker.frames())
    149         , mContentDrawBounds(0, 0, 0, 0)
    150         , mRenderPipeline(std::move(renderPipeline)) {
    151     rootRenderNode->makeRoot();
    152     mRenderNodes.emplace_back(rootRenderNode);
    153     mRenderThread.renderState().registerCanvasContext(this);
    154     mProfiler.setDensity(mRenderThread.mainDisplayInfo().density);
    155 }
    156 
    157 CanvasContext::~CanvasContext() {
    158     destroy();
    159     mRenderThread.renderState().unregisterCanvasContext(this);
    160     for (auto& node : mRenderNodes) {
    161         node->clearRoot();
    162     }
    163     mRenderNodes.clear();
    164 }
    165 
    166 void CanvasContext::addRenderNode(RenderNode* node, bool placeFront) {
    167     int pos = placeFront ? 0 : static_cast<int>(mRenderNodes.size());
    168     node->makeRoot();
    169     mRenderNodes.emplace(mRenderNodes.begin() + pos, node);
    170 }
    171 
    172 void CanvasContext::removeRenderNode(RenderNode* node) {
    173     node->clearRoot();
    174     mRenderNodes.erase(std::remove(mRenderNodes.begin(), mRenderNodes.end(), node),
    175                        mRenderNodes.end());
    176 }
    177 
    178 void CanvasContext::destroy() {
    179     stopDrawing();
    180     setSurface(nullptr);
    181     freePrefetchedLayers();
    182     destroyHardwareResources();
    183     mAnimationContext->destroy();
    184 }
    185 
    186 void CanvasContext::setSurface(sp<Surface>&& surface) {
    187     ATRACE_CALL();
    188 
    189     mNativeSurface = std::move(surface);
    190 
    191     ColorMode colorMode = mWideColorGamut ? ColorMode::WideColorGamut : ColorMode::Srgb;
    192     bool hasSurface = mRenderPipeline->setSurface(mNativeSurface.get(), mSwapBehavior, colorMode);
    193 
    194     mFrameNumber = -1;
    195 
    196     if (hasSurface) {
    197         mHaveNewSurface = true;
    198         mSwapHistory.clear();
    199     } else {
    200         mRenderThread.removeFrameCallback(this);
    201         mGenerationID++;
    202     }
    203 }
    204 
    205 void CanvasContext::setSwapBehavior(SwapBehavior swapBehavior) {
    206     mSwapBehavior = swapBehavior;
    207 }
    208 
    209 bool CanvasContext::pauseSurface() {
    210     mGenerationID++;
    211     return mRenderThread.removeFrameCallback(this);
    212 }
    213 
    214 void CanvasContext::setStopped(bool stopped) {
    215     if (mStopped != stopped) {
    216         mStopped = stopped;
    217         if (mStopped) {
    218             mGenerationID++;
    219             mRenderThread.removeFrameCallback(this);
    220             mRenderPipeline->onStop();
    221         } else if (mIsDirty && hasSurface()) {
    222             mRenderThread.postFrameCallback(this);
    223         }
    224     }
    225 }
    226 
    227 void CanvasContext::setup(float lightRadius, uint8_t ambientShadowAlpha, uint8_t spotShadowAlpha) {
    228     mLightGeometry.radius = lightRadius;
    229     mLightInfo.ambientShadowAlpha = ambientShadowAlpha;
    230     mLightInfo.spotShadowAlpha = spotShadowAlpha;
    231 }
    232 
    233 void CanvasContext::setLightCenter(const Vector3& lightCenter) {
    234     mLightGeometry.center = lightCenter;
    235 }
    236 
    237 void CanvasContext::setOpaque(bool opaque) {
    238     mOpaque = opaque;
    239 }
    240 
    241 void CanvasContext::setWideGamut(bool wideGamut) {
    242     mWideColorGamut = wideGamut;
    243 }
    244 
    245 bool CanvasContext::makeCurrent() {
    246     if (mStopped) return false;
    247 
    248     auto result = mRenderPipeline->makeCurrent();
    249     switch (result) {
    250         case MakeCurrentResult::AlreadyCurrent:
    251             return true;
    252         case MakeCurrentResult::Failed:
    253             mHaveNewSurface = true;
    254             setSurface(nullptr);
    255             return false;
    256         case MakeCurrentResult::Succeeded:
    257             mHaveNewSurface = true;
    258             return true;
    259         default:
    260             LOG_ALWAYS_FATAL("unexpected result %d from IRenderPipeline::makeCurrent",
    261                              (int32_t)result);
    262     }
    263 
    264     return true;
    265 }
    266 
    267 static bool wasSkipped(FrameInfo* info) {
    268     return info && ((*info)[FrameInfoIndex::Flags] & FrameInfoFlags::SkippedFrame);
    269 }
    270 
    271 bool CanvasContext::isSwapChainStuffed() {
    272     static const auto SLOW_THRESHOLD = 6_ms;
    273 
    274     if (mSwapHistory.size() != mSwapHistory.capacity()) {
    275         // We want at least 3 frames of history before attempting to
    276         // guess if the queue is stuffed
    277         return false;
    278     }
    279     nsecs_t frameInterval = mRenderThread.timeLord().frameIntervalNanos();
    280     auto& swapA = mSwapHistory[0];
    281 
    282     // Was there a happy queue & dequeue time? If so, don't
    283     // consider it stuffed
    284     if (swapA.dequeueDuration < SLOW_THRESHOLD && 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 && swapB.queueDuration < SLOW_THRESHOLD) {
    300             return false;
    301         }
    302 
    303         swapA = swapB;
    304     }
    305 
    306     // All signs point to a stuffed swap chain
    307     ATRACE_NAME("swap chain stuffed");
    308     return true;
    309 }
    310 
    311 void CanvasContext::prepareTree(TreeInfo& info, int64_t* uiFrameInfo, int64_t syncQueued,
    312                                 RenderNode* target) {
    313     mRenderThread.removeFrameCallback(this);
    314 
    315     // If the previous frame was dropped we don't need to hold onto it, so
    316     // just keep using the previous frame's structure instead
    317     if (!wasSkipped(mCurrentFrameInfo)) {
    318         mCurrentFrameInfo = mJankTracker.startFrame();
    319     }
    320     mCurrentFrameInfo->importUiThreadInfo(uiFrameInfo);
    321     mCurrentFrameInfo->set(FrameInfoIndex::SyncQueued) = syncQueued;
    322     mCurrentFrameInfo->markSyncStart();
    323 
    324     info.damageAccumulator = &mDamageAccumulator;
    325     info.layerUpdateQueue = &mLayerUpdateQueue;
    326 
    327     mAnimationContext->startFrame(info.mode);
    328     mRenderPipeline->onPrepareTree();
    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         }
    364         /* This logic exists to try and recover from a display latch miss, which essentially
    365          * results in the bufferqueue being double-buffered instead of triple-buffered.
    366          * SurfaceFlinger itself now tries to handle & recover from this situation, so this
    367          * logic should no longer be necessary. As it's occasionally triggering when
    368          * undesired disable it.
    369          * TODO: Remove this entirely if the results are solid.
    370         else if (vsyncDelta >= mRenderThread.timeLord().frameIntervalNanos() * 3 ||
    371                    (latestVsync - mLastDropVsync) < 500_ms) {
    372             // It's been several frame intervals, assume the buffer queue is fine
    373             // or the last drop was too recent
    374             info.out.canDrawThisFrame = true;
    375         } else {
    376             info.out.canDrawThisFrame = !isSwapChainStuffed();
    377             if (!info.out.canDrawThisFrame) {
    378                 // dropping frame
    379                 mLastDropVsync = mRenderThread.timeLord().latestVsync();
    380             }
    381         }
    382         */
    383     } else {
    384         info.out.canDrawThisFrame = true;
    385     }
    386 
    387     // TODO: Do we need to abort out if the backdrop is added but not ready? Should that even
    388     // be an allowable combination?
    389     if (mRenderNodes.size() > 2 && !mRenderNodes[1]->isRenderable()) {
    390         info.out.canDrawThisFrame = false;
    391     }
    392 
    393     if (!info.out.canDrawThisFrame) {
    394         mCurrentFrameInfo->addFlag(FrameInfoFlags::SkippedFrame);
    395     }
    396 
    397     bool postedFrameCallback = false;
    398     if (info.out.hasAnimations || !info.out.canDrawThisFrame) {
    399         if (CC_UNLIKELY(!Properties::enableRTAnimations)) {
    400             info.out.requiresUiRedraw = true;
    401         }
    402         if (!info.out.requiresUiRedraw) {
    403             // If animationsNeedsRedraw is set don't bother posting for an RT anim
    404             // as we will just end up fighting the UI thread.
    405             mRenderThread.postFrameCallback(this);
    406             postedFrameCallback = true;
    407         }
    408     }
    409 
    410     if (!postedFrameCallback &&
    411         info.out.animatedImageDelay != TreeInfo::Out::kNoAnimatedImageDelay) {
    412         // Subtract the time of one frame so it can be displayed on time.
    413         const nsecs_t kFrameTime = mRenderThread.timeLord().frameIntervalNanos();
    414         if (info.out.animatedImageDelay <= kFrameTime) {
    415             mRenderThread.postFrameCallback(this);
    416         } else {
    417             const auto delay = info.out.animatedImageDelay - kFrameTime;
    418             int genId = mGenerationID;
    419             mRenderThread.queue().postDelayed(delay, [this, genId]() {
    420                 if (mGenerationID == genId) {
    421                     mRenderThread.postFrameCallback(this);
    422                 }
    423             });
    424         }
    425     }
    426 }
    427 
    428 void CanvasContext::stopDrawing() {
    429     mRenderThread.removeFrameCallback(this);
    430     mAnimationContext->pauseAnimators();
    431     mGenerationID++;
    432 }
    433 
    434 void CanvasContext::notifyFramePending() {
    435     ATRACE_CALL();
    436     mRenderThread.pushBackFrameCallback(this);
    437 }
    438 
    439 void CanvasContext::draw() {
    440     SkRect dirty;
    441     mDamageAccumulator.finish(&dirty);
    442 
    443     // TODO: Re-enable after figuring out cause of b/22592975
    444     //    if (dirty.isEmpty() && Properties::skipEmptyFrames) {
    445     //        mCurrentFrameInfo->addFlag(FrameInfoFlags::SkippedFrame);
    446     //        return;
    447     //    }
    448 
    449     mCurrentFrameInfo->markIssueDrawCommandsStart();
    450 
    451     Frame frame = mRenderPipeline->getFrame();
    452 
    453     SkRect windowDirty = computeDirtyRect(frame, &dirty);
    454 
    455     bool drew = mRenderPipeline->draw(frame, windowDirty, dirty, mLightGeometry, &mLayerUpdateQueue,
    456                                       mContentDrawBounds, mOpaque, mWideColorGamut, mLightInfo,
    457                                       mRenderNodes, &(profiler()));
    458 
    459     int64_t frameCompleteNr = mFrameCompleteCallbacks.size() ? getFrameNumber() : -1;
    460 
    461     waitOnFences();
    462 
    463     bool requireSwap = false;
    464     bool didSwap =
    465             mRenderPipeline->swapBuffers(frame, drew, windowDirty, mCurrentFrameInfo, &requireSwap);
    466 
    467     mIsDirty = false;
    468 
    469     if (requireSwap) {
    470         if (!didSwap) {  // some error happened
    471             setSurface(nullptr);
    472         }
    473         SwapHistory& swap = mSwapHistory.next();
    474         swap.damage = windowDirty;
    475         swap.swapCompletedTime = systemTime(CLOCK_MONOTONIC);
    476         swap.vsyncTime = mRenderThread.timeLord().latestVsync();
    477         if (mNativeSurface.get()) {
    478             int durationUs;
    479             nsecs_t dequeueStart = mNativeSurface->getLastDequeueStartTime();
    480             if (dequeueStart < mCurrentFrameInfo->get(FrameInfoIndex::SyncStart)) {
    481                 // Ignoring dequeue duration as it happened prior to frame render start
    482                 // and thus is not part of the frame.
    483                 swap.dequeueDuration = 0;
    484             } else {
    485                 mNativeSurface->query(NATIVE_WINDOW_LAST_DEQUEUE_DURATION, &durationUs);
    486                 swap.dequeueDuration = us2ns(durationUs);
    487             }
    488             mNativeSurface->query(NATIVE_WINDOW_LAST_QUEUE_DURATION, &durationUs);
    489             swap.queueDuration = us2ns(durationUs);
    490         } else {
    491             swap.dequeueDuration = 0;
    492             swap.queueDuration = 0;
    493         }
    494         mCurrentFrameInfo->set(FrameInfoIndex::DequeueBufferDuration) = swap.dequeueDuration;
    495         mCurrentFrameInfo->set(FrameInfoIndex::QueueBufferDuration) = swap.queueDuration;
    496         mHaveNewSurface = false;
    497         mFrameNumber = -1;
    498     } else {
    499         mCurrentFrameInfo->set(FrameInfoIndex::DequeueBufferDuration) = 0;
    500         mCurrentFrameInfo->set(FrameInfoIndex::QueueBufferDuration) = 0;
    501     }
    502 
    503     // TODO: Use a fence for real completion?
    504     mCurrentFrameInfo->markFrameCompleted();
    505 
    506 #if LOG_FRAMETIME_MMA
    507     float thisFrame = mCurrentFrameInfo->duration(FrameInfoIndex::IssueDrawCommandsStart,
    508                                                   FrameInfoIndex::FrameCompleted) /
    509                       NANOS_PER_MILLIS_F;
    510     if (sFrameCount) {
    511         sBenchMma = ((9 * sBenchMma) + thisFrame) / 10;
    512     } else {
    513         sBenchMma = thisFrame;
    514     }
    515     if (++sFrameCount == 10) {
    516         sFrameCount = 1;
    517         ALOGD("Average frame time: %.4f", sBenchMma);
    518     }
    519 #endif
    520 
    521     if (didSwap) {
    522         for (auto& func : mFrameCompleteCallbacks) {
    523             std::invoke(func, frameCompleteNr);
    524         }
    525         mFrameCompleteCallbacks.clear();
    526     }
    527 
    528     mJankTracker.finishFrame(*mCurrentFrameInfo);
    529     if (CC_UNLIKELY(mFrameMetricsReporter.get() != nullptr)) {
    530         mFrameMetricsReporter->reportFrameMetrics(mCurrentFrameInfo->data());
    531     }
    532 
    533     GpuMemoryTracker::onFrameCompleted();
    534 #ifdef BUGREPORT_FONT_CACHE_USAGE
    535     auto renderType = Properties::getRenderPipelineType();
    536     if (RenderPipelineType::OpenGL == renderType) {
    537         Caches& caches = Caches::getInstance();
    538         caches.fontRenderer.getFontRenderer().historyTracker().frameCompleted();
    539     }
    540 #endif
    541 }
    542 
    543 // Called by choreographer to do an RT-driven animation
    544 void CanvasContext::doFrame() {
    545     if (!mRenderPipeline->isSurfaceReady()) return;
    546     prepareAndDraw(nullptr);
    547 }
    548 
    549 void CanvasContext::prepareAndDraw(RenderNode* node) {
    550     ATRACE_CALL();
    551 
    552     nsecs_t vsync = mRenderThread.timeLord().computeFrameTimeNanos();
    553     int64_t frameInfo[UI_THREAD_FRAME_INFO_SIZE];
    554     UiFrameInfoBuilder(frameInfo).addFlag(FrameInfoFlags::RTAnimation).setVsync(vsync, vsync);
    555 
    556     TreeInfo info(TreeInfo::MODE_RT_ONLY, *this);
    557     prepareTree(info, frameInfo, systemTime(CLOCK_MONOTONIC), node);
    558     if (info.out.canDrawThisFrame) {
    559         draw();
    560     } else {
    561         // wait on fences so tasks don't overlap next frame
    562         waitOnFences();
    563     }
    564 }
    565 
    566 void CanvasContext::markLayerInUse(RenderNode* node) {
    567     if (mPrefetchedLayers.erase(node)) {
    568         node->decStrong(nullptr);
    569     }
    570 }
    571 
    572 void CanvasContext::freePrefetchedLayers() {
    573     if (mPrefetchedLayers.size()) {
    574         for (auto& node : mPrefetchedLayers) {
    575             ALOGW("Incorrectly called buildLayer on View: %s, destroying layer...",
    576                   node->getName());
    577             node->destroyLayers();
    578             node->decStrong(nullptr);
    579         }
    580         mPrefetchedLayers.clear();
    581     }
    582 }
    583 
    584 void CanvasContext::buildLayer(RenderNode* node) {
    585     ATRACE_CALL();
    586     if (!mRenderPipeline->isContextReady()) return;
    587 
    588     // buildLayer() will leave the tree in an unknown state, so we must stop drawing
    589     stopDrawing();
    590 
    591     TreeInfo info(TreeInfo::MODE_FULL, *this);
    592     info.damageAccumulator = &mDamageAccumulator;
    593     info.layerUpdateQueue = &mLayerUpdateQueue;
    594     info.runAnimations = false;
    595     node->prepareTree(info);
    596     SkRect ignore;
    597     mDamageAccumulator.finish(&ignore);
    598     // Tickle the GENERIC property on node to mark it as dirty for damaging
    599     // purposes when the frame is actually drawn
    600     node->setPropertyFieldsDirty(RenderNode::GENERIC);
    601 
    602     mRenderPipeline->renderLayers(mLightGeometry, &mLayerUpdateQueue, mOpaque, mWideColorGamut,
    603                                   mLightInfo);
    604 
    605     node->incStrong(nullptr);
    606     mPrefetchedLayers.insert(node);
    607 }
    608 
    609 bool CanvasContext::copyLayerInto(DeferredLayerUpdater* layer, SkBitmap* bitmap) {
    610     return mRenderPipeline->copyLayerInto(layer, bitmap);
    611 }
    612 
    613 void CanvasContext::destroyHardwareResources() {
    614     stopDrawing();
    615     if (mRenderPipeline->isContextReady()) {
    616         freePrefetchedLayers();
    617         for (const sp<RenderNode>& node : mRenderNodes) {
    618             node->destroyHardwareResources();
    619         }
    620         mRenderPipeline->onDestroyHardwareResources();
    621     }
    622 }
    623 
    624 void CanvasContext::trimMemory(RenderThread& thread, int level) {
    625     auto renderType = Properties::getRenderPipelineType();
    626     switch (renderType) {
    627         case RenderPipelineType::OpenGL: {
    628             // No context means nothing to free
    629             if (!thread.eglManager().hasEglContext()) return;
    630             ATRACE_CALL();
    631             if (level >= TRIM_MEMORY_COMPLETE) {
    632                 thread.renderState().flush(Caches::FlushMode::Full);
    633                 thread.eglManager().destroy();
    634             } else if (level >= TRIM_MEMORY_UI_HIDDEN) {
    635                 thread.renderState().flush(Caches::FlushMode::Moderate);
    636             }
    637             break;
    638         }
    639         case RenderPipelineType::SkiaGL:
    640         case RenderPipelineType::SkiaVulkan: {
    641             // No context means nothing to free
    642             if (!thread.getGrContext()) return;
    643             ATRACE_CALL();
    644             if (level >= TRIM_MEMORY_COMPLETE) {
    645                 thread.cacheManager().trimMemory(CacheManager::TrimMemoryMode::Complete);
    646                 thread.eglManager().destroy();
    647                 thread.vulkanManager().destroy();
    648             } else if (level >= TRIM_MEMORY_UI_HIDDEN) {
    649                 thread.cacheManager().trimMemory(CacheManager::TrimMemoryMode::UiHidden);
    650             }
    651             break;
    652         }
    653         default:
    654             LOG_ALWAYS_FATAL("canvas context type %d not supported", (int32_t)renderType);
    655             break;
    656     }
    657 }
    658 
    659 DeferredLayerUpdater* CanvasContext::createTextureLayer() {
    660     return mRenderPipeline->createTextureLayer();
    661 }
    662 
    663 void CanvasContext::dumpFrames(int fd) {
    664     mJankTracker.dumpStats(fd);
    665     mJankTracker.dumpFrames(fd);
    666 }
    667 
    668 void CanvasContext::resetFrameStats() {
    669     mJankTracker.reset();
    670 }
    671 
    672 void CanvasContext::setName(const std::string&& name) {
    673     mJankTracker.setDescription(JankTrackerType::Window, std::move(name));
    674 }
    675 
    676 void CanvasContext::serializeDisplayListTree() {
    677 #if ENABLE_RENDERNODE_SERIALIZATION
    678     using namespace google::protobuf::io;
    679     char package[128];
    680     // Check whether tracing is enabled for this process.
    681     FILE* file = fopen("/proc/self/cmdline", "r");
    682     if (file) {
    683         if (!fgets(package, 128, file)) {
    684             ALOGE("Error reading cmdline: %s (%d)", strerror(errno), errno);
    685             fclose(file);
    686             return;
    687         }
    688         fclose(file);
    689     } else {
    690         ALOGE("Error opening /proc/self/cmdline: %s (%d)", strerror(errno), errno);
    691         return;
    692     }
    693     char path[1024];
    694     snprintf(path, 1024, "/data/data/%s/cache/rendertree_dump", package);
    695     int fd = open(path, O_CREAT | O_WRONLY, S_IRWXU | S_IRGRP | S_IROTH);
    696     if (fd == -1) {
    697         ALOGD("Failed to open '%s'", path);
    698         return;
    699     }
    700     proto::RenderNode tree;
    701     // TODO: Streaming writes?
    702     mRootRenderNode->copyTo(&tree);
    703     std::string data = tree.SerializeAsString();
    704     write(fd, data.c_str(), data.length());
    705     close(fd);
    706 #endif
    707 }
    708 
    709 void CanvasContext::waitOnFences() {
    710     if (mFrameFences.size()) {
    711         ATRACE_CALL();
    712         for (auto& fence : mFrameFences) {
    713             fence->getResult();
    714         }
    715         mFrameFences.clear();
    716     }
    717 }
    718 
    719 class CanvasContext::FuncTaskProcessor : public TaskProcessor<bool> {
    720 public:
    721     explicit FuncTaskProcessor(TaskManager* taskManager) : TaskProcessor<bool>(taskManager) {}
    722 
    723     virtual void onProcess(const sp<Task<bool> >& task) override {
    724         FuncTask* t = static_cast<FuncTask*>(task.get());
    725         t->func();
    726         task->setResult(true);
    727     }
    728 };
    729 
    730 void CanvasContext::enqueueFrameWork(std::function<void()>&& func) {
    731     if (!mFrameWorkProcessor.get()) {
    732         mFrameWorkProcessor = new FuncTaskProcessor(mRenderPipeline->getTaskManager());
    733     }
    734     sp<FuncTask> task(new FuncTask());
    735     task->func = func;
    736     mFrameFences.push_back(task);
    737     mFrameWorkProcessor->add(task);
    738 }
    739 
    740 int64_t CanvasContext::getFrameNumber() {
    741     // mFrameNumber is reset to -1 when the surface changes or we swap buffers
    742     if (mFrameNumber == -1 && mNativeSurface.get()) {
    743         mFrameNumber = static_cast<int64_t>(mNativeSurface->getNextFrameNumber());
    744     }
    745     return mFrameNumber;
    746 }
    747 
    748 SkRect CanvasContext::computeDirtyRect(const Frame& frame, SkRect* dirty) {
    749     if (frame.width() != mLastFrameWidth || frame.height() != mLastFrameHeight) {
    750         // can't rely on prior content of window if viewport size changes
    751         dirty->setEmpty();
    752         mLastFrameWidth = frame.width();
    753         mLastFrameHeight = frame.height();
    754     } else if (mHaveNewSurface || frame.bufferAge() == 0) {
    755         // New surface needs a full draw
    756         dirty->setEmpty();
    757     } else {
    758         if (!dirty->isEmpty() && !dirty->intersect(0, 0, frame.width(), frame.height())) {
    759             ALOGW("Dirty " RECT_STRING " doesn't intersect with 0 0 %d %d ?", SK_RECT_ARGS(*dirty),
    760                   frame.width(), frame.height());
    761             dirty->setEmpty();
    762         }
    763         profiler().unionDirty(dirty);
    764     }
    765 
    766     if (dirty->isEmpty()) {
    767         dirty->set(0, 0, frame.width(), frame.height());
    768     }
    769 
    770     // At this point dirty is the area of the window to update. However,
    771     // the area of the frame we need to repaint is potentially different, so
    772     // stash the screen area for later
    773     SkRect windowDirty(*dirty);
    774 
    775     // If the buffer age is 0 we do a full-screen repaint (handled above)
    776     // If the buffer age is 1 the buffer contents are the same as they were
    777     // last frame so there's nothing to union() against
    778     // Therefore we only care about the > 1 case.
    779     if (frame.bufferAge() > 1) {
    780         if (frame.bufferAge() > (int)mSwapHistory.size()) {
    781             // We don't have enough history to handle this old of a buffer
    782             // Just do a full-draw
    783             dirty->set(0, 0, frame.width(), frame.height());
    784         } else {
    785             // At this point we haven't yet added the latest frame
    786             // to the damage history (happens below)
    787             // So we need to damage
    788             for (int i = mSwapHistory.size() - 1;
    789                  i > ((int)mSwapHistory.size()) - frame.bufferAge(); i--) {
    790                 dirty->join(mSwapHistory[i].damage);
    791             }
    792         }
    793     }
    794 
    795     return windowDirty;
    796 }
    797 
    798 } /* namespace renderthread */
    799 } /* namespace uirenderer */
    800 } /* namespace android */
    801