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Beyond the necessary reinitialization methods, we need to protect ourselves from recycling a frame that some other entity in the browser is still using. Generally speaking the animated surface will only be used in imgFrame::Draw since we don't layerize animated images, which will be safe. However with OMTP or blob recordings, we could retain a reference to the surface outside the current stack context. Additional if something calls RasterImage::GetImageContainer(AtSize) or RasterImage::GetFrame(AtSize), it may also have a reference to the surface for an indetermine period of time. As such, if an imgFrame is a candidate for recycling, it will wrap imgFrame::mLockedSurface in a RecyclingSourceSurface. Its job is to track how many consumers there are still of the surface, so that after we advance the animation, the decoder will know if there are still outstanding consumers. If the surface is still in use, it will block for a finite period of time (the refresh interval) before giving up on reclaiming the surface, and will allocate a new surface. The old surface can then remain in circulation for as long as necessary without further blocking the animation progression, since we stop recycling that surface/imgFrame. Differential Revision: https://phabricator.services.mozilla.com/D7511
67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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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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#ifndef mozilla_image_RecyclingSourceSurface_h
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#define mozilla_image_RecyclingSourceSurface_h
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#include "mozilla/gfx/2D.h"
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namespace mozilla {
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namespace image {
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class imgFrame;
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/**
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* This surface subclass will prevent the underlying surface from being recycled
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* as long as it is still alive. We will create this surface to wrap imgFrame's
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* mLockedSurface, if we are accessing it on a path that will keep the surface
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* alive for an indeterminate period of time (e.g. imgFrame::GetSourceSurface,
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* imgFrame::Draw with a recording or capture DrawTarget).
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*/
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class RecyclingSourceSurface final : public gfx::DataSourceSurface
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{
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public:
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RecyclingSourceSurface(imgFrame* aParent, gfx::DataSourceSurface* aSurface);
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MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(RecyclingSourceSurface, override);
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uint8_t* GetData() override { return mSurface->GetData(); }
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int32_t Stride() override { return mSurface->Stride(); }
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gfx::SurfaceType GetType() const override { return mType; }
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gfx::IntSize GetSize() const override { return mSurface->GetSize(); }
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gfx::SurfaceFormat GetFormat() const override { return mSurface->GetFormat(); }
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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,
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uint64_t& aExtIdOut) const override
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{ }
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bool OnHeap() const override { return mSurface->OnHeap(); }
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bool Map(MapType aType, MappedSurface* aMappedSurface) override
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{
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return mSurface->Map(aType, aMappedSurface);
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}
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void Unmap() override { mSurface->Unmap(); }
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gfx::DataSourceSurface* GetChildSurface() const { return mSurface; }
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protected:
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void GuaranteePersistance() override { }
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~RecyclingSourceSurface() override;
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RefPtr<imgFrame> mParent;
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RefPtr<DataSourceSurface> mSurface;
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gfx::SurfaceType mType;
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};
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} // namespace image
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} // namespace mozilla
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#endif //mozilla_image_RecyclingSourceSurface_h
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