From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- image/IDecodingTask.cpp | 221 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 221 insertions(+) create mode 100644 image/IDecodingTask.cpp (limited to 'image/IDecodingTask.cpp') diff --git a/image/IDecodingTask.cpp b/image/IDecodingTask.cpp new file mode 100644 index 0000000000..1816c9056b --- /dev/null +++ b/image/IDecodingTask.cpp @@ -0,0 +1,221 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "IDecodingTask.h" + +#include "nsThreadUtils.h" +#include "mozilla/AppShutdown.h" + +#include "Decoder.h" +#include "DecodePool.h" +#include "RasterImage.h" +#include "SurfaceCache.h" + +namespace mozilla { + +using gfx::IntRect; + +namespace image { + +/////////////////////////////////////////////////////////////////////////////// +// Helpers for sending notifications to the image associated with a decoder. +/////////////////////////////////////////////////////////////////////////////// + +void IDecodingTask::EnsureHasEventTarget(NotNull aImage) { + if (!mEventTarget) { + // We determine the event target as late as possible, at the first dispatch + // time, because the observers bound to an imgRequest will affect it. + // We cache it rather than query for the event target each time because the + // event target can change. We don't want to risk events being executed in + // a different order than they are dispatched, which can happen if we + // selected scheduler groups which have no ordering guarantees relative to + // each other (e.g. it moves from scheduler group A for doc group DA to + // scheduler group B for doc group DB due to changing observers -- if we + // dispatched the first event on A, and the second on B, we don't know which + // will execute first.) + RefPtr tracker = aImage->GetProgressTracker(); + if (tracker) { + mEventTarget = tracker->GetEventTarget(); + } else { + mEventTarget = GetMainThreadSerialEventTarget(); + } + } +} + +bool IDecodingTask::IsOnEventTarget() const { + // This is essentially equivalent to NS_IsOnMainThread() because all of the + // event targets are for the main thread (although perhaps with a different + // label / scheduler group). The observers in ProgressTracker may have + // different event targets from this, so this is just a best effort guess. + bool current = false; + mEventTarget->IsOnCurrentThread(¤t); + return current; +} + +void IDecodingTask::NotifyProgress(NotNull aImage, + NotNull aDecoder) { + MOZ_ASSERT(aDecoder->HasProgress() && !aDecoder->IsMetadataDecode()); + EnsureHasEventTarget(aImage); + + // Capture the decoder's state. If we need to notify asynchronously, it's + // important that we don't wait until the lambda actually runs to capture the + // state that we're going to notify. That would both introduce data races on + // the decoder's state and cause inconsistencies between the NotifyProgress() + // calls we make off-main-thread and the notifications that RasterImage + // actually receives, which would cause bugs. + Progress progress = aDecoder->TakeProgress(); + OrientedIntRect invalidRect = aDecoder->TakeInvalidRect(); + Maybe frameCount = aDecoder->TakeCompleteFrameCount(); + DecoderFlags decoderFlags = aDecoder->GetDecoderFlags(); + SurfaceFlags surfaceFlags = aDecoder->GetSurfaceFlags(); + + // Synchronously notify if we can. + if (IsOnEventTarget() && !(decoderFlags & DecoderFlags::ASYNC_NOTIFY)) { + aImage->NotifyProgress(progress, invalidRect, frameCount, decoderFlags, + surfaceFlags); + return; + } + + // Don't try to dispatch after shutdown, we'll just leak the runnable. + if (NS_WARN_IF( + AppShutdown::IsInOrBeyond(ShutdownPhase::XPCOMShutdownThreads))) { + return; + } + + // We're forced to notify asynchronously. + NotNull> image = aImage; + mEventTarget->Dispatch(CreateRenderBlockingRunnable(NS_NewRunnableFunction( + "IDecodingTask::NotifyProgress", + [=]() -> void { + image->NotifyProgress(progress, invalidRect, + frameCount, decoderFlags, + surfaceFlags); + })), + NS_DISPATCH_NORMAL); +} + +void IDecodingTask::NotifyDecodeComplete(NotNull aImage, + NotNull aDecoder) { + MOZ_ASSERT(aDecoder->HasError() || !aDecoder->InFrame(), + "Decode complete in the middle of a frame?"); + EnsureHasEventTarget(aImage); + + // Capture the decoder's state. + DecoderFinalStatus finalStatus = aDecoder->FinalStatus(); + ImageMetadata metadata = aDecoder->GetImageMetadata(); + DecoderTelemetry telemetry = aDecoder->Telemetry(); + Progress progress = aDecoder->TakeProgress(); + OrientedIntRect invalidRect = aDecoder->TakeInvalidRect(); + Maybe frameCount = aDecoder->TakeCompleteFrameCount(); + DecoderFlags decoderFlags = aDecoder->GetDecoderFlags(); + SurfaceFlags surfaceFlags = aDecoder->GetSurfaceFlags(); + + // Synchronously notify if we can. + if (IsOnEventTarget() && !(decoderFlags & DecoderFlags::ASYNC_NOTIFY)) { + aImage->NotifyDecodeComplete(finalStatus, metadata, telemetry, progress, + invalidRect, frameCount, decoderFlags, + surfaceFlags); + return; + } + + // Don't try to dispatch after shutdown, we'll just leak the runnable. + if (NS_WARN_IF( + AppShutdown::IsInOrBeyond(ShutdownPhase::XPCOMShutdownThreads))) { + return; + } + + // We're forced to notify asynchronously. + NotNull> image = aImage; + mEventTarget->Dispatch(CreateRenderBlockingRunnable(NS_NewRunnableFunction( + "IDecodingTask::NotifyDecodeComplete", + [=]() -> void { + image->NotifyDecodeComplete( + finalStatus, metadata, telemetry, progress, + invalidRect, frameCount, decoderFlags, + surfaceFlags); + })), + NS_DISPATCH_NORMAL); +} + +/////////////////////////////////////////////////////////////////////////////// +// IDecodingTask implementation. +/////////////////////////////////////////////////////////////////////////////// + +void IDecodingTask::Resume() { DecodePool::Singleton()->AsyncRun(this); } + +/////////////////////////////////////////////////////////////////////////////// +// MetadataDecodingTask implementation. +/////////////////////////////////////////////////////////////////////////////// + +MetadataDecodingTask::MetadataDecodingTask(NotNull aDecoder) + : mMutex("mozilla::image::MetadataDecodingTask"), mDecoder(aDecoder) { + MOZ_ASSERT(mDecoder->IsMetadataDecode(), + "Use DecodingTask for non-metadata decodes"); +} + +void MetadataDecodingTask::Run() { + MutexAutoLock lock(mMutex); + + LexerResult result = mDecoder->Decode(WrapNotNull(this)); + + if (result.is()) { + NotifyDecodeComplete(mDecoder->GetImage(), mDecoder); + return; // We're done. + } + + if (result == LexerResult(Yield::NEED_MORE_DATA)) { + // We can't make any more progress right now. We also don't want to report + // any progress, because it's important that metadata decode results are + // delivered atomically. The decoder itself will ensure that we get + // reenqueued when more data is available; just return for now. + return; + } + + MOZ_ASSERT_UNREACHABLE("Metadata decode yielded for an unexpected reason"); +} + +/////////////////////////////////////////////////////////////////////////////// +// AnonymousDecodingTask implementation. +/////////////////////////////////////////////////////////////////////////////// + +AnonymousDecodingTask::AnonymousDecodingTask(NotNull aDecoder, + bool aResumable) + : mDecoder(aDecoder), mResumable(aResumable) {} + +void AnonymousDecodingTask::Run() { + while (true) { + LexerResult result = mDecoder->Decode(WrapNotNull(this)); + + if (result.is()) { + return; // We're done. + } + + if (result == LexerResult(Yield::NEED_MORE_DATA)) { + // We can't make any more progress right now. Let the caller decide how to + // handle it. + return; + } + + // Right now we don't do anything special for other kinds of yields, so just + // keep working. + MOZ_ASSERT(result.is()); + } +} + +void AnonymousDecodingTask::Resume() { + // Anonymous decoders normally get all their data at once. We have tests + // where they don't; typically in these situations, the test re-runs them + // manually. However some tests want to verify Resume works, so they will + // explicitly request this behaviour. + if (mResumable) { + RefPtr self(this); + NS_DispatchToMainThread( + NS_NewRunnableFunction("image::AnonymousDecodingTask::Resume", + [self]() -> void { self->Run(); })); + } +} + +} // namespace image +} // namespace mozilla -- cgit v1.2.3