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90 lines
2.6 KiB
C++
90 lines
2.6 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 implemented for single-frame decoded surfaces.
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*/
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#ifndef mozilla_image_DecodedSurfaceProvider_h
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#define mozilla_image_DecodedSurfaceProvider_h
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#include "IDecodingTask.h"
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#include "ISurfaceProvider.h"
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#include "SurfaceCache.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 a single-frame image and
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* stores the resulting surface.
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*/
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class DecodedSurfaceProvider 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(DecodedSurfaceProvider, override)
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DecodedSurfaceProvider(NotNull<RasterImage*> aImage,
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const SurfaceKey& aSurfaceKey,
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NotNull<Decoder*> aDecoder);
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//////////////////////////////////////////////////////////////////////////////
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// ISurfaceProvider implementation.
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//////////////////////////////////////////////////////////////////////////////
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public:
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bool IsFinished() const override;
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size_t LogicalSizeInBytes() const override;
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protected:
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DrawableFrameRef DrawableRef(size_t aFrame) override;
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bool IsLocked() const override { return bool(mLockRef); }
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void SetLocked(bool aLocked) 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 ~DecodedSurfaceProvider();
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void DropImageReference();
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void CheckForNewSurface();
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void FinishDecoding();
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/// The image associated with our decoder. Dropped after decoding.
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RefPtr<RasterImage> mImage;
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/// Mutex protecting access to mDecoder.
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Mutex mMutex;
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/// The decoder that will generate our surface. Dropped after decoding.
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RefPtr<Decoder> mDecoder;
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/// Our surface. Initially null until it's generated by the decoder.
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RefPtr<imgFrame> mSurface;
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/// A drawable reference to our service; used for locking.
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DrawableFrameRef mLockRef;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_DecodedSurfaceProvider_h
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