1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/gpu/effects/GrBicubicEffect.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,98 @@
1.4 +/*
1.5 + * Copyright 2013 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef GrBicubicTextureEffect_DEFINED
1.12 +#define GrBicubicTextureEffect_DEFINED
1.13 +
1.14 +#include "GrSingleTextureEffect.h"
1.15 +#include "GrTextureDomain.h"
1.16 +#include "GrDrawEffect.h"
1.17 +#include "gl/GrGLEffect.h"
1.18 +#include "GrTBackendEffectFactory.h"
1.19 +
1.20 +class GrGLBicubicEffect;
1.21 +
1.22 +class GrBicubicEffect : public GrSingleTextureEffect {
1.23 +public:
1.24 + enum {
1.25 + kFilterTexelPad = 2, // Given a src rect in texels to be filtered, this number of
1.26 + // surrounding texels are needed by the kernel in x and y.
1.27 + };
1.28 + virtual ~GrBicubicEffect();
1.29 +
1.30 + static const char* Name() { return "Bicubic"; }
1.31 + const float* coefficients() const { return fCoefficients; }
1.32 +
1.33 + typedef GrGLBicubicEffect GLEffect;
1.34 +
1.35 + virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
1.36 + virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
1.37 +
1.38 + const GrTextureDomain& domain() const { return fDomain; }
1.39 +
1.40 + /**
1.41 + * Create a simple filter effect with custom bicubic coefficients and optional domain.
1.42 + */
1.43 + static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16],
1.44 + const SkRect* domain = NULL) {
1.45 + if (NULL == domain) {
1.46 + static const SkShader::TileMode kTileModes[] = { SkShader::kClamp_TileMode,
1.47 + SkShader::kClamp_TileMode };
1.48 + return Create(tex, coefficients, MakeDivByTextureWHMatrix(tex), kTileModes);
1.49 + } else {
1.50 + AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients,
1.51 + MakeDivByTextureWHMatrix(tex),
1.52 + *domain)));
1.53 + return CreateEffectRef(effect);
1.54 + }
1.55 + }
1.56 +
1.57 + /**
1.58 + * Create a Mitchell filter effect with specified texture matrix and x/y tile modes.
1.59 + */
1.60 + static GrEffectRef* Create(GrTexture* tex, const SkMatrix& matrix,
1.61 + SkShader::TileMode tileModes[2]) {
1.62 + return Create(tex, gMitchellCoefficients, matrix, tileModes);
1.63 + }
1.64 +
1.65 + /**
1.66 + * Create a filter effect with custom bicubic coefficients, the texture matrix, and the x/y
1.67 + * tilemodes.
1.68 + */
1.69 + static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16],
1.70 + const SkMatrix& matrix, const SkShader::TileMode tileModes[2]) {
1.71 + AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients, matrix, tileModes)));
1.72 + return CreateEffectRef(effect);
1.73 + }
1.74 +
1.75 + /**
1.76 + * Create a Mitchell filter effect with a texture matrix and a domain.
1.77 + */
1.78 + static GrEffectRef* Create(GrTexture* tex, const SkMatrix& matrix, const SkRect& domain) {
1.79 + AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, gMitchellCoefficients, matrix,
1.80 + domain)));
1.81 + return CreateEffectRef(effect);
1.82 + }
1.83 +
1.84 +private:
1.85 + GrBicubicEffect(GrTexture*, const SkScalar coefficients[16],
1.86 + const SkMatrix &matrix, const SkShader::TileMode tileModes[2]);
1.87 + GrBicubicEffect(GrTexture*, const SkScalar coefficients[16],
1.88 + const SkMatrix &matrix, const SkRect& domain);
1.89 + virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
1.90 +
1.91 + float fCoefficients[16];
1.92 + GrTextureDomain fDomain;
1.93 +
1.94 + GR_DECLARE_EFFECT_TEST;
1.95 +
1.96 + static const SkScalar gMitchellCoefficients[16];
1.97 +
1.98 + typedef GrSingleTextureEffect INHERITED;
1.99 +};
1.100 +
1.101 +#endif
