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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=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_GFX_SOURCESURFACEWEBGL_H_
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#define MOZILLA_GFX_SOURCESURFACEWEBGL_H_
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#include "mozilla/gfx/2D.h"
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#include "mozilla/WeakPtr.h"
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namespace mozilla::gfx {
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class DrawTargetWebgl;
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class SharedContextWebgl;
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class TextureHandle;
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// SourceSurfaceWebgl holds WebGL resources that can be used to efficiently
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// copy snapshot data between multiple DrawTargetWebgls. It also takes care
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// of copy-on-write behavior when the owner target is modified or destructs.
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class SourceSurfaceWebgl : public DataSourceSurface {
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public:
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MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(SourceSurfaceWebgl, override)
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explicit SourceSurfaceWebgl(DrawTargetWebgl* aDT);
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virtual ~SourceSurfaceWebgl();
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SurfaceType GetType() const override { return SurfaceType::WEBGL; }
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IntSize GetSize() const override { return mSize; }
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SurfaceFormat GetFormat() const override { return mFormat; }
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uint8_t* GetData() override;
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int32_t Stride() override;
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bool Map(MapType aType, MappedSurface* aMappedSurface) override;
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void Unmap() override;
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bool HasReadData() const { return !!mData; }
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already_AddRefed<SourceSurface> ExtractSubrect(const IntRect& aRect) override;
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private:
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friend class DrawTargetWebgl;
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friend class SharedContextWebgl;
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explicit SourceSurfaceWebgl(const RefPtr<SharedContextWebgl>& aSharedContext);
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bool EnsureData();
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void DrawTargetWillChange(bool aNeedHandle);
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void GiveTexture(RefPtr<TextureHandle> aHandle);
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void SetHandle(TextureHandle* aHandle);
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void OnUnlinkTexture(SharedContextWebgl* aContext);
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DrawTargetWebgl* GetTarget() const { return mDT.get(); }
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SurfaceFormat mFormat = SurfaceFormat::UNKNOWN;
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IntSize mSize;
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// Any data that has been read back from the WebGL context for mapping.
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RefPtr<DataSourceSurface> mData;
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// The draw target that currently owns the texture for this surface.
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WeakPtr<DrawTargetWebgl> mDT;
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// The actual shared context that any WebGL resources belong to.
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WeakPtr<SharedContextWebgl> mSharedContext;
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// If this snapshot has been copied into a cached texture handle.
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RefPtr<TextureHandle> mHandle;
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};
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} // namespace mozilla::gfx
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#endif /* MOZILLA_GFX_SOURCESURFACEWEBGL_H_ */
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