mirror of
https://github.com/mozilla/gecko-dev.git
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301 lines
9.8 KiB
C++
301 lines
9.8 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 "MultipartImage.h"
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#include "imgINotificationObserver.h"
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namespace mozilla {
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using gfx::IntSize;
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using gfx::SourceSurface;
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namespace image {
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///////////////////////////////////////////////////////////////////////////////
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// Helpers
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///////////////////////////////////////////////////////////////////////////////
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class NextPartObserver : public IProgressObserver {
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public:
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MOZ_DECLARE_REFCOUNTED_TYPENAME(NextPartObserver)
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NS_INLINE_DECL_REFCOUNTING(NextPartObserver, override)
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explicit NextPartObserver(MultipartImage* aOwner) : mOwner(aOwner) {
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MOZ_ASSERT(mOwner);
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}
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void BeginObserving(Image* aImage) {
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MOZ_ASSERT(aImage);
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mImage = aImage;
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RefPtr<ProgressTracker> tracker = mImage->GetProgressTracker();
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tracker->AddObserver(this);
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}
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void BlockUntilDecodedAndFinishObserving() {
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// Use RequestDecodeForSize() to block until our image finishes decoding.
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// The size is ignored because we don't pass the FLAG_HIGH_QUALITY_SCALING
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// flag.
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mImage->RequestDecodeForSize(gfx::IntSize(0, 0),
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imgIContainer::FLAG_SYNC_DECODE);
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// RequestDecodeForSize() should've sent synchronous notifications that
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// would have caused us to call FinishObserving() (and null out mImage)
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// already. If for some reason it didn't, we should do so here.
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if (mImage) {
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FinishObserving();
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}
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}
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virtual void Notify(int32_t aType,
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const nsIntRect* aRect = nullptr) override {
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if (!mImage) {
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// We've already finished observing the last image we were given.
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return;
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}
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if (aType == imgINotificationObserver::FRAME_COMPLETE) {
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FinishObserving();
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}
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}
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virtual void OnLoadComplete(bool aLastPart) override {
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if (!mImage) {
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// We've already finished observing the last image we were given.
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return;
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}
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// Retrieve the image's intrinsic size.
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int32_t width = 0;
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int32_t height = 0;
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mImage->GetWidth(&width);
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mImage->GetHeight(&height);
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// Request decoding at the intrinsic size.
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mImage->RequestDecodeForSize(IntSize(width, height),
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imgIContainer::DECODE_FLAGS_DEFAULT |
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imgIContainer::FLAG_HIGH_QUALITY_SCALING);
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// If there's already an error, we may never get a FRAME_COMPLETE
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// notification, so go ahead and notify our owner right away.
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RefPtr<ProgressTracker> tracker = mImage->GetProgressTracker();
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if (tracker->GetProgress() & FLAG_HAS_ERROR) {
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FinishObserving();
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}
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}
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// Other notifications are ignored.
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virtual void SetHasImage() override {}
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virtual bool NotificationsDeferred() const override { return false; }
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virtual void MarkPendingNotify() override {}
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virtual void ClearPendingNotify() override {}
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private:
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virtual ~NextPartObserver() {}
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void FinishObserving() {
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MOZ_ASSERT(mImage);
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RefPtr<ProgressTracker> tracker = mImage->GetProgressTracker();
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tracker->RemoveObserver(this);
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mImage = nullptr;
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mOwner->FinishTransition();
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}
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MultipartImage* mOwner;
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RefPtr<Image> mImage;
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};
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///////////////////////////////////////////////////////////////////////////////
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// Implementation
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///////////////////////////////////////////////////////////////////////////////
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MultipartImage::MultipartImage(Image* aFirstPart)
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: ImageWrapper(aFirstPart), mPendingNotify(false) {
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mNextPartObserver = new NextPartObserver(this);
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}
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void MultipartImage::Init() {
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(mTracker, "Should've called SetProgressTracker() by now");
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// Start observing the first part.
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RefPtr<ProgressTracker> firstPartTracker = InnerImage()->GetProgressTracker();
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firstPartTracker->AddObserver(this);
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InnerImage()->IncrementAnimationConsumers();
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}
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MultipartImage::~MultipartImage() {
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// Ask our ProgressTracker to drop its weak reference to us.
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mTracker->ResetImage();
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}
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NS_IMPL_ISUPPORTS_INHERITED0(MultipartImage, ImageWrapper)
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void MultipartImage::BeginTransitionToPart(Image* aNextPart) {
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(aNextPart);
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if (mNextPart) {
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// Let the decoder catch up so we don't drop frames.
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mNextPartObserver->BlockUntilDecodedAndFinishObserving();
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MOZ_ASSERT(!mNextPart);
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}
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mNextPart = aNextPart;
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// Start observing the next part; we'll complete the transition when
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// NextPartObserver calls FinishTransition.
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mNextPartObserver->BeginObserving(mNextPart);
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mNextPart->IncrementAnimationConsumers();
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}
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static Progress FilterProgress(Progress aProgress) {
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// Filter out onload blocking notifications, since we don't want to block
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// onload for multipart images.
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// Filter out errors, since we don't want errors in one part to error out
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// the whole stream.
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return aProgress & ~FLAG_HAS_ERROR;
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}
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void MultipartImage::FinishTransition() {
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(mNextPart, "Should have a next part here");
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RefPtr<ProgressTracker> newCurrentPartTracker =
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mNextPart->GetProgressTracker();
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if (newCurrentPartTracker->GetProgress() & FLAG_HAS_ERROR) {
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// This frame has an error; drop it.
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mNextPart = nullptr;
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// We still need to notify, though.
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mTracker->ResetForNewRequest();
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RefPtr<ProgressTracker> currentPartTracker =
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InnerImage()->GetProgressTracker();
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mTracker->SyncNotifyProgress(
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FilterProgress(currentPartTracker->GetProgress()));
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return;
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}
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// Stop observing the current part.
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{
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RefPtr<ProgressTracker> currentPartTracker =
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InnerImage()->GetProgressTracker();
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currentPartTracker->RemoveObserver(this);
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}
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// Make the next part become the current part.
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mTracker->ResetForNewRequest();
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SetInnerImage(mNextPart);
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mNextPart = nullptr;
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newCurrentPartTracker->AddObserver(this);
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// Finally, send all the notifications for the new current part and send a
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// FRAME_UPDATE notification so that observers know to redraw.
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mTracker->SyncNotifyProgress(
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FilterProgress(newCurrentPartTracker->GetProgress()),
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GetMaxSizedIntRect());
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}
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already_AddRefed<imgIContainer> MultipartImage::Unwrap() {
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// Although we wrap another image, we don't allow callers to unwrap as. As far
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// as external code is concerned, MultipartImage is atomic.
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nsCOMPtr<imgIContainer> image = this;
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return image.forget();
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}
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already_AddRefed<ProgressTracker> MultipartImage::GetProgressTracker() {
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MOZ_ASSERT(mTracker);
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RefPtr<ProgressTracker> tracker = mTracker;
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return tracker.forget();
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}
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void MultipartImage::SetProgressTracker(ProgressTracker* aTracker) {
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MOZ_ASSERT(aTracker);
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MOZ_ASSERT(!mTracker);
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mTracker = aTracker;
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}
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nsresult MultipartImage::OnImageDataAvailable(nsIRequest* aRequest,
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nsIInputStream* aInStr,
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uint64_t aSourceOffset,
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uint32_t aCount) {
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// Note that this method is special in that we forward it to the next part if
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// one exists, and *not* the current part.
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// We may trigger notifications that will free mNextPart, so keep it alive.
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RefPtr<Image> nextPart = mNextPart;
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if (nextPart) {
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nextPart->OnImageDataAvailable(aRequest, aInStr, aSourceOffset, aCount);
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} else {
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InnerImage()->OnImageDataAvailable(aRequest, aInStr, aSourceOffset, aCount);
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}
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return NS_OK;
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}
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nsresult MultipartImage::OnImageDataComplete(nsIRequest* aRequest,
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nsresult aStatus, bool aLastPart) {
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// Note that this method is special in that we forward it to the next part if
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// one exists, and *not* the current part.
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// We may trigger notifications that will free mNextPart, so keep it alive.
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RefPtr<Image> nextPart = mNextPart;
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if (nextPart) {
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nextPart->OnImageDataComplete(aRequest, aStatus, aLastPart);
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} else {
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InnerImage()->OnImageDataComplete(aRequest, aStatus, aLastPart);
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}
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return NS_OK;
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}
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void MultipartImage::Notify(int32_t aType,
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const nsIntRect* aRect /* = nullptr*/) {
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if (aType == imgINotificationObserver::SIZE_AVAILABLE) {
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mTracker->SyncNotifyProgress(FLAG_SIZE_AVAILABLE);
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} else if (aType == imgINotificationObserver::FRAME_UPDATE) {
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mTracker->SyncNotifyProgress(NoProgress, *aRect);
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} else if (aType == imgINotificationObserver::FRAME_COMPLETE) {
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mTracker->SyncNotifyProgress(FLAG_FRAME_COMPLETE);
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} else if (aType == imgINotificationObserver::LOAD_COMPLETE) {
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mTracker->SyncNotifyProgress(FLAG_LOAD_COMPLETE);
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} else if (aType == imgINotificationObserver::DECODE_COMPLETE) {
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mTracker->SyncNotifyProgress(FLAG_DECODE_COMPLETE);
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} else if (aType == imgINotificationObserver::DISCARD) {
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mTracker->OnDiscard();
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} else if (aType == imgINotificationObserver::UNLOCKED_DRAW) {
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mTracker->OnUnlockedDraw();
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} else if (aType == imgINotificationObserver::IS_ANIMATED) {
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mTracker->SyncNotifyProgress(FLAG_IS_ANIMATED);
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} else if (aType == imgINotificationObserver::HAS_TRANSPARENCY) {
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mTracker->SyncNotifyProgress(FLAG_HAS_TRANSPARENCY);
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} else {
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MOZ_ASSERT_UNREACHABLE("Notification list should be exhaustive");
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}
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}
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void MultipartImage::OnLoadComplete(bool aLastPart) {
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Progress progress = FLAG_LOAD_COMPLETE;
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if (aLastPart) {
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progress |= FLAG_LAST_PART_COMPLETE;
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}
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mTracker->SyncNotifyProgress(progress);
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}
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void MultipartImage::SetHasImage() { mTracker->OnImageAvailable(); }
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bool MultipartImage::NotificationsDeferred() const { return mPendingNotify; }
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void MultipartImage::MarkPendingNotify() { mPendingNotify = true; }
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void MultipartImage::ClearPendingNotify() { mPendingNotify = false; }
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} // namespace image
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} // namespace mozilla
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