зеркало из https://github.com/mozilla/gecko-dev.git
115 строки
3.7 KiB
C++
115 строки
3.7 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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/**
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* An ISurfaceProvider for animated images.
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*/
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#ifndef mozilla_image_AnimationSurfaceProvider_h
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#define mozilla_image_AnimationSurfaceProvider_h
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#include "FrameAnimator.h"
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#include "IDecodingTask.h"
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#include "ISurfaceProvider.h"
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#include "AnimationFrameBuffer.h"
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namespace mozilla {
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namespace image {
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/**
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* An ISurfaceProvider that manages the decoding of animated images and
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* dynamically generates surfaces for the current playback state of the
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* animation.
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*/
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class AnimationSurfaceProvider final
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: public ISurfaceProvider
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, public IDecodingTask
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{
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AnimationSurfaceProvider, override)
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AnimationSurfaceProvider(NotNull<RasterImage*> aImage,
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const SurfaceKey& aSurfaceKey,
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NotNull<Decoder*> aDecoder,
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size_t aCurrentFrame);
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//////////////////////////////////////////////////////////////////////////////
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// ISurfaceProvider implementation.
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//////////////////////////////////////////////////////////////////////////////
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public:
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// We use the ISurfaceProvider constructor of DrawableSurface to indicate that
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// our surfaces are computed lazily.
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DrawableSurface Surface() override { return DrawableSurface(WrapNotNull(this)); }
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bool IsFinished() const override;
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bool IsFullyDecoded() const override;
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size_t LogicalSizeInBytes() const override;
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void AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
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size_t& aHeapSizeOut,
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size_t& aNonHeapSizeOut,
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size_t& aExtHandlesOut) override;
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void Reset() override;
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void Advance(size_t aFrame) override;
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protected:
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DrawableFrameRef DrawableRef(size_t aFrame) override;
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// Animation frames are always locked. This is because we only want to release
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// their memory atomically (due to the surface cache discarding them). If they
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// were unlocked, the OS could end up releasing the memory of random frames
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// from the middle of the animation, which is not worth the complexity of
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// dealing with.
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bool IsLocked() const override { return true; }
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void SetLocked(bool) override { }
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//////////////////////////////////////////////////////////////////////////////
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// IDecodingTask implementation.
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//////////////////////////////////////////////////////////////////////////////
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public:
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void Run() override;
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bool ShouldPreferSyncRun() const override;
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// Full decodes are low priority compared to metadata decodes because they
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// don't block layout or page load.
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TaskPriority Priority() const override { return TaskPriority::eLow; }
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private:
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virtual ~AnimationSurfaceProvider();
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void DropImageReference();
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void AnnounceSurfaceAvailable();
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void FinishDecoding();
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// @returns Whether or not we should continue decoding.
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bool CheckForNewFrameAtYield();
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// @returns Whether or not we should restart decoding.
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bool CheckForNewFrameAtTerminalState();
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/// The image associated with our decoder.
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RefPtr<RasterImage> mImage;
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/// A mutex to protect mDecoder. Always taken before mFramesMutex.
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mutable Mutex mDecodingMutex;
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/// The decoder used to decode this animation.
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RefPtr<Decoder> mDecoder;
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/// A mutex to protect mFrames. Always taken after mDecodingMutex.
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mutable Mutex mFramesMutex;
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/// The frames of this animation, in order.
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AnimationFrameBuffer mFrames;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_AnimationSurfaceProvider_h
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