1 /* 2 * Copyright 2013 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 GrDistanceFieldTextureEffect_DEFINED 9 #define GrDistanceFieldTextureEffect_DEFINED 10 11 #include "GrEffect.h" 12 #include "GrVertexEffect.h" 13 14 class GrGLDistanceFieldTextureEffect; 15 16 /** 17 * The output color of this effect is a modulation of the input color and a sample from a 18 * distance field texture (using a smoothed step function near 0.5). 19 * It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input 20 * coords are a custom attribute. 21 */ 22 class GrDistanceFieldTextureEffect : public GrVertexEffect { 23 public: Create(GrTexture * tex,const GrTextureParams & p)24 static GrEffectRef* Create(GrTexture* tex, const GrTextureParams& p) { 25 AutoEffectUnref effect(SkNEW_ARGS(GrDistanceFieldTextureEffect, (tex, p))); 26 return CreateEffectRef(effect); 27 } 28 ~GrDistanceFieldTextureEffect()29 virtual ~GrDistanceFieldTextureEffect() {} 30 Name()31 static const char* Name() { return "Texture"; } 32 33 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 34 35 typedef GrGLDistanceFieldTextureEffect GLEffect; 36 37 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 38 39 private: 40 GrDistanceFieldTextureEffect(GrTexture* texture, const GrTextureParams& params); 41 42 virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE; 43 44 GrTextureAccess fTextureAccess; 45 46 GR_DECLARE_EFFECT_TEST; 47 48 typedef GrVertexEffect INHERITED; 49 }; 50 51 #endif 52