1 /* 2 * Copyright 2012 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 GrSingleTextureEffect_DEFINED 9 #define GrSingleTextureEffect_DEFINED 10 11 #include "GrEffect.h" 12 #include "SkMatrix.h" 13 14 class GrTexture; 15 16 /** 17 * A base class for effects that draw a single texture with a texture matrix. 18 */ 19 class GrSingleTextureEffect : public GrEffect { 20 public: 21 virtual ~GrSingleTextureEffect(); 22 23 const SkMatrix& getMatrix() const { return fMatrix; } 24 25 protected: 26 GrSingleTextureEffect(GrTexture*, const SkMatrix&); /* unfiltered, clamp mode */ 27 GrSingleTextureEffect(GrTexture*, const SkMatrix&, bool bilerp); /* clamp mode */ 28 GrSingleTextureEffect(GrTexture*, const SkMatrix&, const GrTextureParams&); 29 30 /** 31 * Helper for subclass onIsEqual() functions. 32 */ 33 bool hasSameTextureParamsAndMatrix(const GrSingleTextureEffect& other) const { 34 const GrTextureAccess& otherAccess = other.fTextureAccess; 35 // We don't have to check the accesses' swizzles because they are inferred from the texture. 36 return fTextureAccess.getTexture() == otherAccess.getTexture() && 37 fTextureAccess.getParams() == otherAccess.getParams() && 38 this->getMatrix().cheapEqualTo(other.getMatrix()); 39 } 40 41 /** 42 * Can be used as a helper to implement subclass getConstantColorComponents(). It assumes that 43 * the subclass output color will be a modulation of the input color with a value read from the 44 * texture. 45 */ 46 void updateConstantColorComponentsForModulation(GrColor* color, uint32_t* validFlags) const { 47 if ((*validFlags & kA_ValidComponentFlag) && 0xFF == GrColorUnpackA(*color) && 48 GrPixelConfigIsOpaque(this->texture(0)->config())) { 49 *validFlags = kA_ValidComponentFlag; 50 } else { 51 *validFlags = 0; 52 } 53 } 54 55 private: 56 GrTextureAccess fTextureAccess; 57 SkMatrix fMatrix; 58 59 typedef GrEffect INHERITED; 60 }; 61 62 #endif 63
