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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 GrBackendTextureImageGenerator_DEFINED
#define GrBackendTextureImageGenerator_DEFINED
#include "SkImageGenerator.h"
#include "GrBackendSurface.h"
#include "SkAtomics.h"
class GrSemaphore;
class GrBackendTextureImageGenerator : public SkImageGenerator {
public:
static std::unique_ptr<SkImageGenerator> Make(sk_sp<GrTexture>, GrSurfaceOrigin,
sk_sp<GrSemaphore>,
SkAlphaType, sk_sp<SkColorSpace>);
~GrBackendTextureImageGenerator() override;
protected:
// NOTE: We would like to validate that the owning context hasn't been abandoned, but we can't
// do that safely (we might be on another thread). So assume everything is fine.
bool onIsValid(GrContext*) const override { return true; }
#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:
GrBackendTextureImageGenerator(const SkImageInfo& info, GrTexture*, GrSurfaceOrigin,
uint32_t owningContextID, sk_sp<GrSemaphore>,
const GrBackendTexture&);
static void ReleaseRefHelper_TextureReleaseProc(void* ctx);
class RefHelper : public SkNVRefCnt<RefHelper> {
public:
RefHelper(GrTexture* texture, uint32_t owningContextID)
: fOriginalTexture(texture)
, fOwningContextID(owningContextID)
, fBorrowedTexture(nullptr)
, fBorrowingContextID(SK_InvalidGenID) { }
~RefHelper();
GrTexture* fOriginalTexture;
uint32_t fOwningContextID;
// There is never a ref associated with this pointer. We rely on our atomic bookkeeping
// with the context ID to know when this pointer is valid and safe to use. This lets us
// avoid releasing a ref from another thread, or get into races during context shutdown.
GrTexture* fBorrowedTexture;
SkAtomic<uint32_t> fBorrowingContextID;
};
RefHelper* fRefHelper;
sk_sp<GrSemaphore> fSemaphore;
uint32_t fLastBorrowingContextID;
GrBackendTexture fBackendTexture;
GrSurfaceOrigin fSurfaceOrigin;
typedef SkImageGenerator INHERITED;
};
#endif // GrBackendTextureImageGenerator_DEFINED
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