blob: 1124b9628b3d22da1b07923ef114fb8ea8ffe6cc [file] [log] [blame]
* 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 {
static std::unique_ptr<SkImageGenerator> Make(sk_sp<GrTexture>, sk_sp<GrSemaphore>,
SkAlphaType, sk_sp<SkColorSpace>);
~GrBackendTextureImageGenerator() override;
// 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; }
TexGenType onCanGenerateTexture() const override { return TexGenType::kCheap; }
sk_sp<GrTextureProxy> onGenerateTexture(GrContext*, const SkImageInfo&, const SkIPoint&,
SkTransferFunctionBehavior) override;
GrBackendTextureImageGenerator(const SkImageInfo& info, GrTexture*,
uint32_t owningContextID, sk_sp<GrSemaphore>,
const GrBackendTexture&);
static void ReleaseRefHelper_TextureReleaseProc(void* ctx);
class RefHelper : public SkNVRefCnt<RefHelper> {
RefHelper(GrTexture* texture, uint32_t owningContextID)
: fOriginalTexture(texture)
, fOwningContextID(owningContextID)
, fBorrowedTexture(nullptr)
, fBorrowingContextID(SK_InvalidGenID) { }
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