mirror of
https://github.com/mozilla/gecko-dev.git
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2c28cda879
The decoding loop in Decoder::Decode only pauses to report progress when it runs out of bytes to decode. So for long animated images where the network is keeping up with decoding it will be a relatively long time until we deliver the first frame complete notification and corresponding invalidation. In most cases this shouldn't be too expensive as it is just dispatching a runnable to the main thread from the decoding thread.
504 lines
12 KiB
C++
504 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "DecodePool.h"
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#include <algorithm>
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/Monitor.h"
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#include "nsCOMPtr.h"
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#include "nsIObserverService.h"
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#include "nsIThreadPool.h"
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#include "nsThreadManager.h"
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#include "nsThreadUtils.h"
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#include "nsXPCOMCIDInternal.h"
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#include "prsystem.h"
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#ifdef MOZ_NUWA_PROCESS
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#include "ipc/Nuwa.h"
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#endif
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#include "gfxPrefs.h"
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#include "Decoder.h"
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#include "RasterImage.h"
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using std::max;
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using std::min;
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namespace mozilla {
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namespace image {
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///////////////////////////////////////////////////////////////////////////////
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// Helper runnables.
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///////////////////////////////////////////////////////////////////////////////
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class NotifyProgressWorker : public Runnable
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{
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public:
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/**
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* Called by the DecodePool when it's done some significant portion of
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* decoding, so that progress can be recorded and notifications can be sent.
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*/
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static void Dispatch(RasterImage* aImage,
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Progress aProgress,
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const nsIntRect& aInvalidRect,
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SurfaceFlags aSurfaceFlags)
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{
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MOZ_ASSERT(aImage);
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nsCOMPtr<nsIRunnable> worker =
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new NotifyProgressWorker(aImage, aProgress, aInvalidRect, aSurfaceFlags);
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NS_DispatchToMainThread(worker);
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}
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NS_IMETHOD Run() override
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{
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MOZ_ASSERT(NS_IsMainThread());
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mImage->NotifyProgress(mProgress, mInvalidRect, mSurfaceFlags);
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return NS_OK;
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}
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private:
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NotifyProgressWorker(RasterImage* aImage,
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Progress aProgress,
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const nsIntRect& aInvalidRect,
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SurfaceFlags aSurfaceFlags)
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: mImage(aImage)
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, mProgress(aProgress)
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, mInvalidRect(aInvalidRect)
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, mSurfaceFlags(aSurfaceFlags)
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{ }
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RefPtr<RasterImage> mImage;
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const Progress mProgress;
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const nsIntRect mInvalidRect;
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const SurfaceFlags mSurfaceFlags;
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};
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class NotifyDecodeCompleteWorker : public Runnable
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{
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public:
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/**
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* Called by the DecodePool when decoding is complete, so that final cleanup
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* can be performed.
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*/
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static void Dispatch(Decoder* aDecoder)
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{
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MOZ_ASSERT(aDecoder);
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nsCOMPtr<nsIRunnable> worker = new NotifyDecodeCompleteWorker(aDecoder);
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NS_DispatchToMainThread(worker);
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}
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NS_IMETHOD Run() override
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{
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MOZ_ASSERT(NS_IsMainThread());
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mDecoder->GetImage()->FinalizeDecoder(mDecoder);
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return NS_OK;
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}
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private:
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explicit NotifyDecodeCompleteWorker(Decoder* aDecoder)
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: mDecoder(aDecoder)
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{ }
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RefPtr<Decoder> mDecoder;
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};
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#ifdef MOZ_NUWA_PROCESS
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class RegisterDecodeIOThreadWithNuwaRunnable : public Runnable
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{
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public:
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NS_IMETHOD Run()
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{
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NuwaMarkCurrentThread(static_cast<void(*)(void*)>(nullptr), nullptr);
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return NS_OK;
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}
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};
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#endif // MOZ_NUWA_PROCESS
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///////////////////////////////////////////////////////////////////////////////
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// DecodePool implementation.
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///////////////////////////////////////////////////////////////////////////////
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/* static */ StaticRefPtr<DecodePool> DecodePool::sSingleton;
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/* static */ uint32_t DecodePool::sNumCores = 0;
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NS_IMPL_ISUPPORTS(DecodePool, nsIObserver)
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struct Work
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{
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enum class Type {
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DECODE,
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SHUTDOWN
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} mType;
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RefPtr<Decoder> mDecoder;
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};
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class DecodePoolImpl
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{
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public:
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MOZ_DECLARE_REFCOUNTED_TYPENAME(DecodePoolImpl)
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DecodePoolImpl)
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DecodePoolImpl()
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: mMonitor("DecodePoolImpl")
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, mShuttingDown(false)
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{ }
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/// Initialize the current thread for use by the decode pool.
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void InitCurrentThread()
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{
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MOZ_ASSERT(!NS_IsMainThread());
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mThreadNaming.SetThreadPoolName(NS_LITERAL_CSTRING("ImgDecoder"));
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#ifdef MOZ_NUWA_PROCESS
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if (IsNuwaProcess()) {
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NuwaMarkCurrentThread(static_cast<void(*)(void*)>(nullptr), nullptr);
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}
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#endif // MOZ_NUWA_PROCESS
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}
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/// Shut down the provided decode pool thread.
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static void ShutdownThread(nsIThread* aThisThread)
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{
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// Threads have to be shut down from another thread, so we'll ask the
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// main thread to do it for us.
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NS_DispatchToMainThread(NewRunnableMethod(aThisThread, &nsIThread::Shutdown));
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}
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/**
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* Requests shutdown. New work items will be dropped on the floor, and all
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* decode pool threads will be shut down once existing work items have been
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* processed.
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*/
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void RequestShutdown()
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{
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MonitorAutoLock lock(mMonitor);
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mShuttingDown = true;
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mMonitor.NotifyAll();
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}
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/// Pushes a new decode work item.
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void PushWork(Decoder* aDecoder)
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{
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MOZ_ASSERT(aDecoder);
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RefPtr<Decoder> decoder(aDecoder);
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MonitorAutoLock lock(mMonitor);
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if (mShuttingDown) {
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// Drop any new work on the floor if we're shutting down.
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return;
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}
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if (aDecoder->IsMetadataDecode()) {
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mMetadataDecodeQueue.AppendElement(Move(decoder));
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} else {
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mFullDecodeQueue.AppendElement(Move(decoder));
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}
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mMonitor.Notify();
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}
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/// Pops a new work item, blocking if necessary.
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Work PopWork()
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{
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MonitorAutoLock lock(mMonitor);
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do {
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// Prioritize metadata decodes over full decodes.
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if (!mMetadataDecodeQueue.IsEmpty()) {
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return PopWorkFromQueue(mMetadataDecodeQueue);
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}
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if (!mFullDecodeQueue.IsEmpty()) {
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return PopWorkFromQueue(mFullDecodeQueue);
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}
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if (mShuttingDown) {
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Work work;
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work.mType = Work::Type::SHUTDOWN;
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return work;
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}
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// Nothing to do; block until some work is available.
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mMonitor.Wait();
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} while (true);
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}
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private:
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~DecodePoolImpl() { }
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Work PopWorkFromQueue(nsTArray<RefPtr<Decoder>>& aQueue)
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{
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Work work;
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work.mType = Work::Type::DECODE;
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work.mDecoder = aQueue.LastElement().forget();
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aQueue.RemoveElementAt(aQueue.Length() - 1);
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return work;
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}
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nsThreadPoolNaming mThreadNaming;
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// mMonitor guards the queues and mShuttingDown.
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Monitor mMonitor;
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nsTArray<RefPtr<Decoder>> mMetadataDecodeQueue;
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nsTArray<RefPtr<Decoder>> mFullDecodeQueue;
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bool mShuttingDown;
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};
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class DecodePoolWorker : public Runnable
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{
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public:
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explicit DecodePoolWorker(DecodePoolImpl* aImpl) : mImpl(aImpl) { }
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NS_IMETHOD Run()
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{
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MOZ_ASSERT(!NS_IsMainThread());
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mImpl->InitCurrentThread();
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nsCOMPtr<nsIThread> thisThread;
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nsThreadManager::get()->GetCurrentThread(getter_AddRefs(thisThread));
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do {
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Work work = mImpl->PopWork();
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switch (work.mType) {
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case Work::Type::DECODE:
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DecodePool::Singleton()->Decode(work.mDecoder);
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break;
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case Work::Type::SHUTDOWN:
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DecodePoolImpl::ShutdownThread(thisThread);
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return NS_OK;
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default:
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MOZ_ASSERT_UNREACHABLE("Unknown work type");
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}
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} while (true);
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MOZ_ASSERT_UNREACHABLE("Exiting thread without Work::Type::SHUTDOWN");
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return NS_OK;
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}
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private:
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RefPtr<DecodePoolImpl> mImpl;
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};
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/* static */ void
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DecodePool::Initialize()
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{
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MOZ_ASSERT(NS_IsMainThread());
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sNumCores = max<int32_t>(PR_GetNumberOfProcessors(), 1);
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DecodePool::Singleton();
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}
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/* static */ DecodePool*
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DecodePool::Singleton()
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{
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if (!sSingleton) {
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MOZ_ASSERT(NS_IsMainThread());
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sSingleton = new DecodePool();
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ClearOnShutdown(&sSingleton);
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}
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return sSingleton;
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}
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/* static */ uint32_t
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DecodePool::NumberOfCores()
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{
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return sNumCores;
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}
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DecodePool::DecodePool()
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: mImpl(new DecodePoolImpl)
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, mMutex("image::DecodePool")
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{
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// Determine the number of threads we want.
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int32_t prefLimit = gfxPrefs::ImageMTDecodingLimit();
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uint32_t limit;
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if (prefLimit <= 0) {
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int32_t numCores = NumberOfCores();
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if (numCores <= 1) {
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limit = 1;
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} else if (numCores == 2) {
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// On an otherwise mostly idle system, having two image decoding threads
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// doubles decoding performance, so it's worth doing on dual-core devices,
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// even if under load we can't actually get that level of parallelism.
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limit = 2;
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} else {
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limit = numCores - 1;
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}
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} else {
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limit = static_cast<uint32_t>(prefLimit);
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}
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if (limit > 32) {
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limit = 32;
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}
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// Initialize the thread pool.
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for (uint32_t i = 0 ; i < limit ; ++i) {
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nsCOMPtr<nsIRunnable> worker = new DecodePoolWorker(mImpl);
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nsCOMPtr<nsIThread> thread;
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nsresult rv = NS_NewThread(getter_AddRefs(thread), worker);
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MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv) && thread,
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"Should successfully create image decoding threads");
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mThreads.AppendElement(Move(thread));
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}
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// Initialize the I/O thread.
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nsresult rv = NS_NewNamedThread("ImageIO", getter_AddRefs(mIOThread));
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MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv) && mIOThread,
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"Should successfully create image I/O thread");
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#ifdef MOZ_NUWA_PROCESS
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nsCOMPtr<nsIRunnable> worker = new RegisterDecodeIOThreadWithNuwaRunnable();
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rv = mIOThread->Dispatch(worker, NS_DISPATCH_NORMAL);
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MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv),
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"Should register decode IO thread with Nuwa process");
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#endif
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nsCOMPtr<nsIObserverService> obsSvc = services::GetObserverService();
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if (obsSvc) {
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obsSvc->AddObserver(this, "xpcom-shutdown-threads", false);
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}
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}
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DecodePool::~DecodePool()
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{
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MOZ_ASSERT(NS_IsMainThread(), "Must shut down DecodePool on main thread!");
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}
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NS_IMETHODIMP
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DecodePool::Observe(nsISupports*, const char* aTopic, const char16_t*)
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{
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MOZ_ASSERT(strcmp(aTopic, "xpcom-shutdown-threads") == 0, "Unexpected topic");
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nsTArray<nsCOMPtr<nsIThread>> threads;
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nsCOMPtr<nsIThread> ioThread;
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{
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MutexAutoLock lock(mMutex);
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threads.SwapElements(mThreads);
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ioThread.swap(mIOThread);
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}
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mImpl->RequestShutdown();
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for (uint32_t i = 0 ; i < threads.Length() ; ++i) {
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threads[i]->Shutdown();
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}
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if (ioThread) {
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ioThread->Shutdown();
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}
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return NS_OK;
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}
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void
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DecodePool::AsyncDecode(Decoder* aDecoder)
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{
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MOZ_ASSERT(aDecoder);
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mImpl->PushWork(aDecoder);
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}
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void
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DecodePool::SyncDecodeIfSmall(Decoder* aDecoder)
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(aDecoder);
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if (aDecoder->ShouldSyncDecode(gfxPrefs::ImageMemDecodeBytesAtATime())) {
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Decode(aDecoder);
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return;
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}
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AsyncDecode(aDecoder);
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}
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void
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DecodePool::SyncDecodeIfPossible(Decoder* aDecoder)
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{
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MOZ_ASSERT(NS_IsMainThread());
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Decode(aDecoder);
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}
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already_AddRefed<nsIEventTarget>
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DecodePool::GetIOEventTarget()
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{
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MutexAutoLock threadPoolLock(mMutex);
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nsCOMPtr<nsIEventTarget> target = do_QueryInterface(mIOThread);
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return target.forget();
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}
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void
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DecodePool::Decode(Decoder* aDecoder)
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{
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MOZ_ASSERT(aDecoder);
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nsresult rv = aDecoder->Decode();
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if (NS_SUCCEEDED(rv) && !aDecoder->GetDecodeDone()) {
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// If this isn't a metadata decode, notify for the progress we've made so
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// far. It's important that metadata decode results are delivered
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// atomically, so for those decodes we wait until NotifyDecodeComplete.
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if (aDecoder->HasProgress() && !aDecoder->IsMetadataDecode()) {
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NotifyProgress(aDecoder);
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}
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// The decoder will ensure that a new worker gets enqueued to continue
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// decoding when more data is available.
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} else {
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NotifyDecodeComplete(aDecoder);
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}
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}
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void
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DecodePool::NotifyProgress(Decoder* aDecoder)
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{
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MOZ_ASSERT(aDecoder);
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MOZ_ASSERT(aDecoder->HasProgress() && !aDecoder->IsMetadataDecode());
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if (!NS_IsMainThread() ||
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(aDecoder->GetDecoderFlags() & DecoderFlags::ASYNC_NOTIFY)) {
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NotifyProgressWorker::Dispatch(aDecoder->GetImage(),
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aDecoder->TakeProgress(),
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aDecoder->TakeInvalidRect(),
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aDecoder->GetSurfaceFlags());
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return;
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}
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aDecoder->GetImage()->NotifyProgress(aDecoder->TakeProgress(),
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aDecoder->TakeInvalidRect(),
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aDecoder->GetSurfaceFlags());
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}
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void
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DecodePool::NotifyDecodeComplete(Decoder* aDecoder)
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{
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MOZ_ASSERT(aDecoder);
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if (!NS_IsMainThread() ||
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(aDecoder->GetDecoderFlags() & DecoderFlags::ASYNC_NOTIFY)) {
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NotifyDecodeCompleteWorker::Dispatch(aDecoder);
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return;
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}
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aDecoder->GetImage()->FinalizeDecoder(aDecoder);
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}
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} // namespace image
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} // namespace mozilla
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