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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrAHardwareBufferImageGenerator_DEFINED
#define GrAHardwareBufferImageGenerator_DEFINED
#include "SkImageGenerator.h"
extern "C" {
typedef struct AHardwareBuffer AHardwareBuffer;
}
/**
* GrAHardwareBufferImageGenerator allows to create an SkImage attached to
* an existing android native hardware buffer. A hardware buffer has to be
* created with AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE usage, because it is
* bound to an external texture using an EGLImage. The image generator will
* keep a reference to the hardware buffer for its lifetime. A hardware buffer
* can be shared between processes and same buffer can be used in multiple GPU
* contexts.
* To implement certain features like tiling, Skia may copy the texture to
* avoid OpenGL API limitations.
*/
class GrAHardwareBufferImageGenerator : public SkImageGenerator {
public:
static std::unique_ptr<SkImageGenerator> Make(AHardwareBuffer*, SkAlphaType,
sk_sp<SkColorSpace>);
~GrAHardwareBufferImageGenerator() override;
protected:
bool onIsValid(GrContext*) const override;
#if SK_SUPPORT_GPU
TexGenType onCanGenerateTexture() const override { return TexGenType::kCheap; }
sk_sp<GrTextureProxy> onGenerateTexture(GrContext*, const SkImageInfo&, const SkIPoint&,
SkTransferFunctionBehavior,
bool willNeedMipMaps) override;
#endif
private:
GrAHardwareBufferImageGenerator(const SkImageInfo&, AHardwareBuffer*, SkAlphaType);
sk_sp<GrTextureProxy> makeProxy(GrContext* context);
void clear();
static void deleteImageTexture(void* ctx);
AHardwareBuffer* fGraphicBuffer;
GrTexture* fOriginalTexture = nullptr;
uint32_t fOwningContextID;
typedef SkImageGenerator INHERITED;
};
#endif // GrAHardwareBufferImageGenerator_DEFINED
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