1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrTextureMaker_DEFINED 9 #define GrTextureMaker_DEFINED 10 11 #include "GrTextureProducer.h" 12 13 /** 14 * Base class for sources that start out as something other than a texture (encoded image, 15 * picture, ...). 16 */ 17 class GrTextureMaker : public GrTextureProducer { 18 public: 19 enum class AllowedTexGenType : bool { kCheap, kAny }; 20 21 /** 22 * Returns a texture that is safe for use with the params. If the size of the returned texture 23 * does not match width()/height() then the contents of the original must be scaled to fit 24 * the texture. Additionally, the 'scaleAdjust' must be applied to the texture matrix 25 * in order to correct the absolute texture coordinates. 26 * Places the color space of the texture in (*texColorSpace). 27 */ 28 sk_sp<GrTextureProxy> refTextureProxyForParams(const GrSamplerParams&, 29 SkColorSpace* dstColorSpace, 30 sk_sp<SkColorSpace>* texColorSpace, 31 SkScalar scaleAdjust[2]); 32 33 sk_sp<GrFragmentProcessor> createFragmentProcessor( 34 const SkMatrix& textureMatrix, 35 const SkRect& constraintRect, 36 FilterConstraint filterConstraint, 37 bool coordsLimitedToConstraintRect, 38 const GrSamplerParams::FilterMode* filterOrNullForBicubic, 39 SkColorSpace* dstColorSpace) override; 40 41 protected: GrTextureMaker(GrContext * context,int width,int height,bool isAlphaOnly)42 GrTextureMaker(GrContext* context, int width, int height, bool isAlphaOnly) 43 : INHERITED(width, height, isAlphaOnly) 44 , fContext(context) {} 45 46 /** 47 * Return the maker's "original" texture. It is the responsibility of the maker to handle any 48 * caching of the original if desired. 49 * If "genType" argument equals AllowedTexGenType::kCheap and the texture is not trivial to 50 * construct then refOriginalTextureProxy should return nullptr (for example if texture is made 51 * by drawing into a render target). 52 */ 53 virtual sk_sp<GrTextureProxy> refOriginalTextureProxy(bool willBeMipped, 54 SkColorSpace* dstColorSpace, 55 AllowedTexGenType genType) = 0; 56 57 /** 58 * Returns the color space of the maker's "original" texture, assuming it was retrieved with 59 * the same destination color space. 60 */ 61 virtual sk_sp<SkColorSpace> getColorSpace(SkColorSpace* dstColorSpace) = 0; 62 63 /** 64 * Return a new (uncached) texture that is the stretch of the maker's original. 65 * 66 * The base-class handles general logic for this, and only needs access to the following 67 * method: 68 * - refOriginalTextureProxy() 69 * 70 * Subclass may override this if they can handle creating the texture more directly than 71 * by copying. 72 */ 73 virtual sk_sp<GrTextureProxy> generateTextureProxyForParams(const CopyParams&, 74 bool willBeMipped, 75 SkColorSpace* dstColorSpace); 76 context()77 GrContext* context() const { return fContext; } 78 79 private: 80 GrContext* fContext; 81 82 typedef GrTextureProducer INHERITED; 83 }; 84 85 #endif 86