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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrDistanceFieldTextureEffect_DEFINED
#define GrDistanceFieldTextureEffect_DEFINED
#include "GrProcessor.h"
#include "GrGeometryProcessor.h"
class GrGLDistanceFieldTextureEffect;
class GrGLDistanceFieldNoGammaTextureEffect;
class GrGLDistanceFieldLCDTextureEffect;
class GrInvariantOutput;
enum GrDistanceFieldEffectFlags {
kSimilarity_DistanceFieldEffectFlag = 0x01, // ctm is similarity matrix
kRectToRect_DistanceFieldEffectFlag = 0x02, // ctm maps rects to rects
kUseLCD_DistanceFieldEffectFlag = 0x04, // use lcd text
kBGR_DistanceFieldEffectFlag = 0x08, // lcd display has bgr order
kPortrait_DistanceFieldEffectFlag = 0x10, // lcd display is in portrait mode (not used yet)
kInvalid_DistanceFieldEffectFlag = 0x80, // invalid state (for initialization)
kUniformScale_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag |
kRectToRect_DistanceFieldEffectFlag,
// The subset of the flags relevant to GrDistanceFieldTextureEffect
kNonLCD_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag,
// The subset of the flags relevant to GrDistanceFieldLCDTextureEffect
kLCD_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag |
kRectToRect_DistanceFieldEffectFlag |
kUseLCD_DistanceFieldEffectFlag |
kBGR_DistanceFieldEffectFlag,
};
/**
* The output color of this effect is a modulation of the input color and a sample from a
* distance field texture (using a smoothed step function near 0.5).
* It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input
* coords are a custom attribute. Gamma correction is handled via a texture LUT.
*/
class GrDistanceFieldTextureEffect : public GrGeometryProcessor {
public:
#ifdef SK_GAMMA_APPLY_TO_A8
static GrGeometryProcessor* Create(GrTexture* tex, const GrTextureParams& params,
GrTexture* gamma, const GrTextureParams& gammaParams,
float lum, uint32_t flags) {
return SkNEW_ARGS(GrDistanceFieldTextureEffect, (tex, params, gamma, gammaParams, lum,
flags));
}
#else
static GrGeometryProcessor* Create(GrTexture* tex, const GrTextureParams& params,
uint32_t flags) {
return SkNEW_ARGS(GrDistanceFieldTextureEffect, (tex, params, flags));
}
#endif
virtual ~GrDistanceFieldTextureEffect() {}
static const char* Name() { return "DistanceFieldTexture"; }
const GrShaderVar& inTextureCoords() const { return fInTextureCoords; }
#ifdef SK_GAMMA_APPLY_TO_A8
float getLuminance() const { return fLuminance; }
#endif
uint32_t getFlags() const { return fFlags; }
typedef GrGLDistanceFieldTextureEffect GLProcessor;
virtual const GrBackendGeometryProcessorFactory& getFactory() const SK_OVERRIDE;
private:
GrDistanceFieldTextureEffect(GrTexture* texture, const GrTextureParams& params,
#ifdef SK_GAMMA_APPLY_TO_A8
GrTexture* gamma, const GrTextureParams& gammaParams, float lum,
#endif
uint32_t flags);
virtual bool onIsEqual(const GrGeometryProcessor& other) const SK_OVERRIDE;
virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
GrTextureAccess fTextureAccess;
#ifdef SK_GAMMA_APPLY_TO_A8
GrTextureAccess fGammaTextureAccess;
float fLuminance;
#endif
uint32_t fFlags;
const GrShaderVar& fInTextureCoords;
GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
typedef GrGeometryProcessor INHERITED;
};
/**
* The output color of this effect is a modulation of the input color and a sample from a
* distance field texture (using a smoothed step function near 0.5).
* It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input
* coords are a custom attribute. No gamma correct blending is applied.
*/
class GrDistanceFieldNoGammaTextureEffect : public GrGeometryProcessor {
public:
static GrGeometryProcessor* Create(GrTexture* tex, const GrTextureParams& params,
uint32_t flags) {
return SkNEW_ARGS(GrDistanceFieldNoGammaTextureEffect, (tex, params, flags));
}
virtual ~GrDistanceFieldNoGammaTextureEffect() {}
static const char* Name() { return "DistanceFieldTexture"; }
const GrShaderVar& inTextureCoords() const { return fInTextureCoords; }
uint32_t getFlags() const { return fFlags; }
typedef GrGLDistanceFieldNoGammaTextureEffect GLProcessor;
virtual const GrBackendGeometryProcessorFactory& getFactory() const SK_OVERRIDE;
private:
GrDistanceFieldNoGammaTextureEffect(GrTexture* texture, const GrTextureParams& params,
uint32_t flags);
virtual bool onIsEqual(const GrGeometryProcessor& other) const SK_OVERRIDE;
virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
GrTextureAccess fTextureAccess;
uint32_t fFlags;
const GrShaderVar& fInTextureCoords;
GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
typedef GrGeometryProcessor INHERITED;
};
/**
* The output color of this effect is a modulation of the input color and samples from a
* distance field texture (using a smoothed step function near 0.5), adjusted for LCD displays.
* It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input
* coords are a custom attribute. Gamma correction is handled via a texture LUT.
*/
class GrDistanceFieldLCDTextureEffect : public GrGeometryProcessor {
public:
static GrGeometryProcessor* Create(GrTexture* tex, const GrTextureParams& params,
GrTexture* gamma, const GrTextureParams& gammaParams,
SkColor textColor, uint32_t flags) {
return SkNEW_ARGS(GrDistanceFieldLCDTextureEffect,
(tex, params, gamma, gammaParams, textColor, flags));
}
virtual ~GrDistanceFieldLCDTextureEffect() {}
static const char* Name() { return "DistanceFieldLCDTexture"; }
const GrShaderVar& inTextureCoords() const { return fInTextureCoords; }
GrColor getTextColor() const { return fTextColor; }
uint32_t getFlags() const { return fFlags; }
typedef GrGLDistanceFieldLCDTextureEffect GLProcessor;
virtual const GrBackendGeometryProcessorFactory& getFactory() const SK_OVERRIDE;
private:
GrDistanceFieldLCDTextureEffect(GrTexture* texture, const GrTextureParams& params,
GrTexture* gamma, const GrTextureParams& gammaParams,
SkColor textColor,
uint32_t flags);
virtual bool onIsEqual(const GrGeometryProcessor& other) const SK_OVERRIDE;
virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE;
GrTextureAccess fTextureAccess;
GrTextureAccess fGammaTextureAccess;
GrColor fTextColor;
uint32_t fFlags;
const GrShaderVar& fInTextureCoords;
GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
typedef GrGeometryProcessor INHERITED;
};
#endif
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