| /* |
| * 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>, 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) override; |
| #endif |
| |
| private: |
| GrBackendTextureImageGenerator(const SkImageInfo& info, GrTexture*, |
| 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 |