| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrTextureProvider_DEFINED |
| #define GrTextureProvider_DEFINED |
| |
| #include "GrTexture.h" |
| #include "SkImageFilter.h" |
| |
| class SK_API GrTextureProvider { |
| public: |
| /////////////////////////////////////////////////////////////////////////// |
| // Textures |
| |
| /** |
| * Creates a new texture in the resource cache and returns it. The caller owns a |
| * ref on the returned texture which must be balanced by a call to unref. |
| * |
| * @param desc Description of the texture properties. |
| * @param budgeted Does the texture count against the resource cache budget? |
| * @param srcData Pointer to the pixel values (optional). |
| * @param rowBytes The number of bytes between rows of the texture. Zero |
| * implies tightly packed rows. For compressed pixel configs, this |
| * field is ignored. |
| */ |
| GrTexture* createTexture(const GrSurfaceDesc& desc, bool budgeted, const void* srcData, |
| size_t rowBytes); |
| |
| /** Shortcut for creating a texture with no initial data to upload. */ |
| GrTexture* createTexture(const GrSurfaceDesc& desc, bool budgeted) { |
| return this->createTexture(desc, budgeted, NULL, 0); |
| } |
| |
| /** Assigns a unique key to the texture. The texture will be findable via this key using |
| findTextureByUniqueKey(). If an existing texture has this key, it's key will be removed. */ |
| void assignUniqueKeyToTexture(const GrUniqueKey& key, GrTexture* texture) { |
| this->assignUniqueKeyToResource(key, texture); |
| } |
| |
| /** Finds a texture by unique key. If the texture is found it is ref'ed and returned. */ |
| GrTexture* findAndRefTextureByUniqueKey(const GrUniqueKey& key) { |
| GrGpuResource* resource = this->findAndRefResourceByUniqueKey(key); |
| if (resource) { |
| GrTexture* texture = static_cast<GrSurface*>(resource)->asTexture(); |
| SkASSERT(texture); |
| return texture; |
| } |
| return NULL; |
| } |
| |
| /** |
| * Determines whether a texture is associated with the unique key. If the texture is found it |
| * will not be locked or returned. This call does not affect the priority of the resource for |
| * deletion. |
| */ |
| bool existsTextureWithUniqueKey(const GrUniqueKey& key) const { |
| return this->existsResourceWithUniqueKey(key); |
| } |
| |
| /** |
| * Finds a texture that approximately matches the descriptor. Will be at least as large in width |
| * and height as desc specifies. If desc specifies that the texture should be a render target |
| * then result will be a render target. Format and sample count will always match the request. |
| * The contents of the texture are undefined. The caller owns a ref on the returned texture and |
| * must balance with a call to unref. |
| */ |
| GrTexture* createApproxTexture(const GrSurfaceDesc&); |
| |
| enum SizeConstraint { |
| kExact_SizeConstraint, |
| kApprox_SizeConstraint, |
| }; |
| |
| GrTexture* createTexture(const GrSurfaceDesc& desc, SizeConstraint constraint) { |
| switch (constraint) { |
| case kExact_SizeConstraint: |
| return this->createTexture(desc, true); |
| case kApprox_SizeConstraint: |
| return this->createApproxTexture(desc); |
| } |
| sk_throw(); |
| return nullptr; |
| } |
| |
| static SizeConstraint FromImageFilter(SkImageFilter::SizeConstraint constraint) { |
| if (SkImageFilter::kExact_SizeConstraint == constraint) { |
| return kExact_SizeConstraint; |
| } else { |
| SkASSERT(SkImageFilter::kApprox_SizeConstraint == constraint); |
| return kApprox_SizeConstraint; |
| } |
| } |
| |
| /** Legacy function that no longer should be used. */ |
| enum ScratchTexMatch { |
| kExact_ScratchTexMatch, |
| kApprox_ScratchTexMatch |
| }; |
| GrTexture* refScratchTexture(const GrSurfaceDesc& desc, ScratchTexMatch match) { |
| if (kApprox_ScratchTexMatch == match) { |
| return this->createApproxTexture(desc); |
| } else { |
| return this->createTexture(desc, true); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Wrapped Backend Surfaces |
| |
| /** |
| * Wraps an existing texture with a GrTexture object. |
| * |
| * OpenGL: if the object is a texture Gr may change its GL texture params |
| * when it is drawn. |
| * |
| * @return GrTexture object or NULL on failure. |
| */ |
| GrTexture* wrapBackendTexture(const GrBackendTextureDesc& desc, |
| GrWrapOwnership = kBorrow_GrWrapOwnership); |
| |
| /** |
| * Wraps an existing render target with a GrRenderTarget object. It is |
| * similar to wrapBackendTexture but can be used to draw into surfaces |
| * that are not also textures (e.g. FBO 0 in OpenGL, or an MSAA buffer that |
| * the client will resolve to a texture). Currently wrapped render targets |
| * always use the kBorrow_GrWrapOwnership semantics. |
| * |
| * @return GrTexture object or NULL on failure. |
| */ |
| GrRenderTarget* wrapBackendRenderTarget(const GrBackendRenderTargetDesc& desc); |
| |
| protected: |
| GrTextureProvider(GrGpu* gpu, GrResourceCache* cache) : fCache(cache), fGpu(gpu) {} |
| |
| /** |
| * Assigns a unique key to a resource. If the key is associated with another resource that |
| * association is removed and replaced by this resource. |
| */ |
| void assignUniqueKeyToResource(const GrUniqueKey&, GrGpuResource*); |
| |
| /** |
| * Finds a resource in the cache, based on the specified key. This is intended for use in |
| * conjunction with addResourceToCache(). The return value will be NULL if not found. The |
| * caller must balance with a call to unref(). |
| */ |
| GrGpuResource* findAndRefResourceByUniqueKey(const GrUniqueKey&); |
| |
| /** |
| * Determines whether a resource is in the cache. If the resource is found it |
| * will not be locked or returned. This call does not affect the priority of |
| * the resource for deletion. |
| */ |
| bool existsResourceWithUniqueKey(const GrUniqueKey& key) const; |
| |
| enum ScratchTextureFlags { |
| kExact_ScratchTextureFlag = 0x1, |
| kNoPendingIO_ScratchTextureFlag = 0x2, // (http://skbug.com/4156) |
| kNoCreate_ScratchTextureFlag = 0x4, |
| }; |
| |
| /** A common impl for GrTextureProvider and GrResourceProvider variants. */ |
| GrTexture* internalCreateApproxTexture(const GrSurfaceDesc& desc, uint32_t scratchTextureFlags); |
| |
| GrTexture* refScratchTexture(const GrSurfaceDesc&, uint32_t scratchTextureFlags); |
| |
| void abandon() { |
| fCache = NULL; |
| fGpu = NULL; |
| } |
| |
| GrResourceCache* cache() { return fCache; } |
| const GrResourceCache* cache() const { return fCache; } |
| |
| GrGpu* gpu() { return fGpu; } |
| const GrGpu* gpu() const { return fGpu; } |
| |
| bool isAbandoned() const { |
| SkASSERT(SkToBool(fGpu) == SkToBool(fCache)); |
| return !SkToBool(fCache); |
| } |
| |
| private: |
| GrResourceCache* fCache; |
| GrGpu* fGpu; |
| }; |
| |
| #endif |