michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef GrDistanceFieldTextureEffect_DEFINED
michael@0: #define GrDistanceFieldTextureEffect_DEFINED
michael@0: 
michael@0: #include "GrEffect.h"
michael@0: #include "GrVertexEffect.h"
michael@0: 
michael@0: class GrGLDistanceFieldTextureEffect;
michael@0: 
michael@0: /**
michael@0:  * The output color of this effect is a modulation of the input color and a sample from a
michael@0:  * distance field texture (using a smoothed step function near 0.5).
michael@0:  * It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input
michael@0:  * coords are a custom attribute.
michael@0:  */
michael@0: class GrDistanceFieldTextureEffect : public GrVertexEffect {
michael@0: public:
michael@0:     static GrEffectRef* Create(GrTexture* tex, const GrTextureParams& p, const SkISize& s) {
michael@0:         AutoEffectUnref effect(SkNEW_ARGS(GrDistanceFieldTextureEffect, (tex, p, s)));
michael@0:         return CreateEffectRef(effect);
michael@0:     }
michael@0: 
michael@0:     virtual ~GrDistanceFieldTextureEffect() {}
michael@0: 
michael@0:     static const char* Name() { return "DistanceFieldTexture"; }
michael@0: 
michael@0:     virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
michael@0:     const SkSize& getSize() const { return fSize; }
michael@0: 
michael@0:     typedef GrGLDistanceFieldTextureEffect GLEffect;
michael@0: 
michael@0:     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     GrDistanceFieldTextureEffect(GrTexture* texture, const GrTextureParams& params,
michael@0:                                  const SkISize& textureSize);
michael@0: 
michael@0:     virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE;
michael@0: 
michael@0:     GrTextureAccess fTextureAccess;
michael@0:     SkSize          fSize;
michael@0: 
michael@0:     GR_DECLARE_EFFECT_TEST;
michael@0: 
michael@0:     typedef GrVertexEffect INHERITED;
michael@0: };
michael@0: 
michael@0: #endif