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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_GFX_SOURCESURFACEWEBGL_H_
#define MOZILLA_GFX_SOURCESURFACEWEBGL_H_
#include "mozilla/gfx/2D.h"
#include "mozilla/WeakPtr.h"
namespace mozilla::gfx {
class DrawTargetWebgl;
class TextureHandle;
// SourceSurfaceWebgl holds WebGL resources that can be used to efficiently
// copy snapshot data between multiple DrawTargetWebgls. It also takes care
// of copy-on-write behavior when the owner target is modified or destructs.
class SourceSurfaceWebgl : public DataSourceSurface {
public:
MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(SourceSurfaceWebgl, override)
explicit SourceSurfaceWebgl(DrawTargetWebgl* aDT);
SourceSurfaceWebgl(
const RefPtr<TextureHandle>& aHandle,
const RefPtr<typename DrawTargetWebgl::SharedContext>& aSharedContext);
virtual ~SourceSurfaceWebgl();
SurfaceType GetType() const override { return SurfaceType::WEBGL; }
IntSize GetSize() const override { return mSize; }
SurfaceFormat GetFormat() const override { return mFormat; }
uint8_t* GetData() override;
int32_t Stride() override;
bool Map(MapType aType, MappedSurface* aMappedSurface) override;
void Unmap() override;
bool HasReadData() const { return !!mData; }
already_AddRefed<SourceSurface> ExtractSubrect(const IntRect& aRect) override;
private:
friend class DrawTargetWebgl;
bool EnsureData();
void DrawTargetWillChange(bool aNeedHandle);
void GiveTexture(RefPtr<TextureHandle> aHandle);
void OnUnlinkTexture(typename DrawTargetWebgl::SharedContext* aContext);
DrawTargetWebgl* GetTarget() const { return mDT.get(); }
SurfaceFormat mFormat = SurfaceFormat::UNKNOWN;
IntSize mSize;
// Any data that has been read back from the WebGL context for mapping.
RefPtr<DataSourceSurface> mData;
// The draw target that currently owns the texture for this surface.
WeakPtr<DrawTargetWebgl> mDT;
// The actual shared context that any WebGL resources belong to.
WeakPtr<typename DrawTargetWebgl::SharedContext> mSharedContext;
// If this snapshot has been copied into a cached texture handle.
RefPtr<TextureHandle> mHandle;
};
} // namespace mozilla::gfx
#endif /* MOZILLA_GFX_SOURCESURFACEWEBGL_H_ */
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