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 GrBicubicTextureEffect_DEFINED 9 #define GrBicubicTextureEffect_DEFINED 10 11 #include "GrSingleTextureEffect.h" 12 #include "GrDrawEffect.h" 13 #include "gl/GrGLEffect.h" 14 #include "GrTBackendEffectFactory.h" 15 16 class GrGLBicubicEffect; 17 18 class GrBicubicEffect : public GrSingleTextureEffect { 19 public: 20 enum { 21 kFilterTexelPad = 2, // Given a src rect in texels to be filtered, this number of 22 // surrounding texels are needed by the kernel in x and y. 23 }; 24 virtual ~GrBicubicEffect(); 25 26 static const char* Name() { return "Bicubic"; } 27 const float* coefficients() const { return fCoefficients; } 28 29 typedef GrGLBicubicEffect GLEffect; 30 31 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 32 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 33 34 /** 35 * Create a simple Mitchell filter effect. 36 */ 37 static GrEffectRef* Create(GrTexture* tex) { 38 return Create(tex, gMitchellCoefficients); 39 } 40 41 /** 42 * Create a simple filter effect with custom bicubic coefficients. 43 */ 44 static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16]) { 45 const SkShader::TileMode tm[] = { SkShader::kClamp_TileMode, SkShader::kClamp_TileMode }; 46 return Create(tex, coefficients, MakeDivByTextureWHMatrix(tex), tm); 47 } 48 49 /** 50 * Create a Mitchell filter effect with specified texture matrix and x/y tile modes. 51 */ 52 static GrEffectRef* Create(GrTexture* tex, 53 const SkMatrix& matrix, 54 SkShader::TileMode tileModes[2]) { 55 return Create(tex, gMitchellCoefficients, matrix, tileModes); 56 } 57 58 /** 59 * The most general Create method. This allows specification of the bicubic coefficients, the 60 * texture matrix, and the x/y tilemodes. 61 */ 62 static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16], 63 const SkMatrix& matrix, 64 const SkShader::TileMode tileModes[2]) { 65 AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients, matrix, tileModes))); 66 return CreateEffectRef(effect); 67 } 68 69 private: 70 GrBicubicEffect(GrTexture*, const SkScalar coefficients[16], 71 const SkMatrix &matrix, const SkShader::TileMode tileModes[2]); 72 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; 73 float fCoefficients[16]; 74 75 GR_DECLARE_EFFECT_TEST; 76 77 static const SkScalar gMitchellCoefficients[16]; 78 79 typedef GrSingleTextureEffect INHERITED; 80 }; 81 82 #endif 83
