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 GrBicubicTextureEffect_DEFINED
michael@0: #define GrBicubicTextureEffect_DEFINED
michael@0: 
michael@0: #include "GrSingleTextureEffect.h"
michael@0: #include "GrTextureDomain.h"
michael@0: #include "GrDrawEffect.h"
michael@0: #include "gl/GrGLEffect.h"
michael@0: #include "GrTBackendEffectFactory.h"
michael@0: 
michael@0: class GrGLBicubicEffect;
michael@0: 
michael@0: class GrBicubicEffect : public GrSingleTextureEffect {
michael@0: public:
michael@0:     enum {
michael@0:         kFilterTexelPad = 2, // Given a src rect in texels to be filtered, this number of
michael@0:                              // surrounding texels are needed by the kernel in x and y.
michael@0:     };
michael@0:     virtual ~GrBicubicEffect();
michael@0: 
michael@0:     static const char* Name() { return "Bicubic"; }
michael@0:     const float* coefficients() const { return fCoefficients; }
michael@0: 
michael@0:     typedef GrGLBicubicEffect GLEffect;
michael@0: 
michael@0:     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
michael@0:     virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
michael@0: 
michael@0:     const GrTextureDomain& domain() const { return fDomain; }
michael@0: 
michael@0:     /**
michael@0:      * Create a simple filter effect with custom bicubic coefficients and optional domain.
michael@0:      */
michael@0:     static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16],
michael@0:                                const SkRect* domain = NULL) {
michael@0:         if (NULL == domain) {
michael@0:             static const SkShader::TileMode kTileModes[] = { SkShader::kClamp_TileMode,
michael@0:                                                              SkShader::kClamp_TileMode };
michael@0:             return Create(tex, coefficients, MakeDivByTextureWHMatrix(tex), kTileModes);
michael@0:         } else {
michael@0:             AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients,
michael@0:                                                                 MakeDivByTextureWHMatrix(tex),
michael@0:                                                                 *domain)));
michael@0:             return CreateEffectRef(effect);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Create a Mitchell filter effect with specified texture matrix and x/y tile modes.
michael@0:      */
michael@0:     static GrEffectRef* Create(GrTexture* tex, const SkMatrix& matrix,
michael@0:                                SkShader::TileMode tileModes[2]) {
michael@0:         return Create(tex, gMitchellCoefficients, matrix, tileModes);
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Create a filter effect with custom bicubic coefficients, the texture matrix, and the x/y
michael@0:      * tilemodes.
michael@0:      */
michael@0:     static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16],
michael@0:                                const SkMatrix& matrix, const SkShader::TileMode tileModes[2]) {
michael@0:         AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients, matrix, tileModes)));
michael@0:         return CreateEffectRef(effect);
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Create a Mitchell filter effect with a texture matrix and a domain.
michael@0:      */
michael@0:     static GrEffectRef* Create(GrTexture* tex, const SkMatrix& matrix, const SkRect& domain) {
michael@0:         AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, gMitchellCoefficients, matrix,
michael@0:                                                             domain)));
michael@0:         return CreateEffectRef(effect);
michael@0:     }
michael@0: 
michael@0: private:
michael@0:     GrBicubicEffect(GrTexture*, const SkScalar coefficients[16],
michael@0:                     const SkMatrix &matrix, const SkShader::TileMode tileModes[2]);
michael@0:     GrBicubicEffect(GrTexture*, const SkScalar coefficients[16],
michael@0:                     const SkMatrix &matrix, const SkRect& domain);
michael@0:     virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
michael@0: 
michael@0:     float           fCoefficients[16];
michael@0:     GrTextureDomain fDomain;
michael@0: 
michael@0:     GR_DECLARE_EFFECT_TEST;
michael@0: 
michael@0:     static const SkScalar gMitchellCoefficients[16];
michael@0: 
michael@0:     typedef GrSingleTextureEffect INHERITED;
michael@0: };
michael@0: 
michael@0: #endif