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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 GrDistanceFieldGeoProc_DEFINED
#define GrDistanceFieldGeoProc_DEFINED
#include "src/core/SkArenaAlloc.h"
#include "src/gpu/GrGeometryProcessor.h"
#include "src/gpu/GrProcessor.h"
class GrGLDistanceFieldA8TextGeoProc;
class GrGLDistanceFieldPathGeoProc;
class GrGLDistanceFieldLCDTextGeoProc;
class GrInvariantOutput;
enum GrDistanceFieldEffectFlags {
kSimilarity_DistanceFieldEffectFlag = 0x01, // ctm is similarity matrix
kScaleOnly_DistanceFieldEffectFlag = 0x02, // ctm has only scale and translate
kPerspective_DistanceFieldEffectFlag = 0x04, // ctm has perspective (and positions are x,y,w)
kUseLCD_DistanceFieldEffectFlag = 0x08, // use lcd text
kBGR_DistanceFieldEffectFlag = 0x10, // lcd display has bgr order
kPortrait_DistanceFieldEffectFlag = 0x20, // lcd display is in portrait mode (not used yet)
kGammaCorrect_DistanceFieldEffectFlag = 0x40, // assume gamma-correct output (linear blending)
kAliased_DistanceFieldEffectFlag = 0x80, // monochrome output
kInvalid_DistanceFieldEffectFlag = 0x100, // invalid state (for initialization)
kUniformScale_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag |
kScaleOnly_DistanceFieldEffectFlag,
// The subset of the flags relevant to GrDistanceFieldA8TextGeoProc
kNonLCD_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag |
kScaleOnly_DistanceFieldEffectFlag |
kPerspective_DistanceFieldEffectFlag |
kGammaCorrect_DistanceFieldEffectFlag |
kAliased_DistanceFieldEffectFlag,
// The subset of the flags relevant to GrDistanceFieldLCDTextGeoProc
kLCD_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag |
kScaleOnly_DistanceFieldEffectFlag |
kPerspective_DistanceFieldEffectFlag |
kUseLCD_DistanceFieldEffectFlag |
kBGR_DistanceFieldEffectFlag |
kGammaCorrect_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 (GrSamplerState). The input
* coords are a custom attribute. Gamma correction is handled via a texture LUT.
*/
class GrDistanceFieldA8TextGeoProc : public GrGeometryProcessor {
public:
inline static constexpr int kMaxTextures = 4;
/** The local matrix should be identity if local coords are not required by the GrPipeline. */
#ifdef SK_GAMMA_APPLY_TO_A8
static GrGeometryProcessor* Make(SkArenaAlloc* arena,
const GrShaderCaps& caps,
const GrSurfaceProxyView* views,
int numActiveViews,
GrSamplerState params,
float lum,
uint32_t flags,
const SkMatrix& localMatrixIfUsesLocalCoords) {
return arena->make([&](void* ptr) {
return new (ptr) GrDistanceFieldA8TextGeoProc(
caps, views, numActiveViews, params, lum, flags, localMatrixIfUsesLocalCoords);
});
}
#else
static GrGeometryProcessor* Make(SkArenaAlloc* arena,
const GrShaderCaps& caps,
const GrSurfaceProxyView* views,
int numActiveViews,
GrSamplerState params,
uint32_t flags,
const SkMatrix& localMatrixIfUsesLocalCoords) {
return arena->make([&](void* ptr) {
return new (ptr) GrDistanceFieldA8TextGeoProc(
caps, views, numActiveViews, params, flags, localMatrixIfUsesLocalCoords);
});
}
#endif
~GrDistanceFieldA8TextGeoProc() override {}
const char* name() const override { return "DistanceFieldA8Text"; }
void addNewViews(const GrSurfaceProxyView* views, int numViews, GrSamplerState);
void addToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override;
std::unique_ptr<ProgramImpl> makeProgramImpl(const GrShaderCaps&) const override;
private:
class Impl;
GrDistanceFieldA8TextGeoProc(const GrShaderCaps& caps,
const GrSurfaceProxyView* views,
int numActiveViews,
GrSamplerState params,
#ifdef SK_GAMMA_APPLY_TO_A8
float distanceAdjust,
#endif
uint32_t flags,
const SkMatrix& localMatrix);
const TextureSampler& onTextureSampler(int i) const override { return fTextureSamplers[i]; }
TextureSampler fTextureSamplers[kMaxTextures];
SkISize fAtlasDimensions; // dimensions for all textures used with fTextureSamplers[].
SkMatrix fLocalMatrix;
Attribute fInPosition;
Attribute fInColor;
Attribute fInTextureCoords;
uint32_t fFlags;
#ifdef SK_GAMMA_APPLY_TO_A8
float fDistanceAdjust;
#endif
GR_DECLARE_GEOMETRY_PROCESSOR_TEST
using INHERITED = GrGeometryProcessor;
};
/**
* 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 (GrSamplerState). The input
* coords are a custom attribute. No gamma correct blending is applied. Used for paths only.
*/
class GrDistanceFieldPathGeoProc : public GrGeometryProcessor {
public:
inline static constexpr int kMaxTextures = 4;
/** The local matrix should be identity if local coords are not required by the GrPipeline. */
static GrGeometryProcessor* Make(SkArenaAlloc* arena, const GrShaderCaps& caps,
const SkMatrix& matrix, bool wideColor,
const GrSurfaceProxyView* views, int numActiveViews,
GrSamplerState params, uint32_t flags) {
return arena->make([&](void* ptr) {
return new (ptr) GrDistanceFieldPathGeoProc(caps, matrix, wideColor, views,
numActiveViews, params, flags);
});
}
~GrDistanceFieldPathGeoProc() override {}
const char* name() const override { return "DistanceFieldPath"; }
void addNewViews(const GrSurfaceProxyView*, int numActiveViews, GrSamplerState);
void addToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override;
std::unique_ptr<ProgramImpl> makeProgramImpl(const GrShaderCaps&) const override;
private:
class Impl;
GrDistanceFieldPathGeoProc(const GrShaderCaps& caps,
const SkMatrix& matrix,
bool wideColor,
const GrSurfaceProxyView* views,
int numActiveViews,
GrSamplerState,
uint32_t flags);
const TextureSampler& onTextureSampler(int i) const override { return fTextureSamplers[i]; }
SkMatrix fMatrix; // view matrix if perspective, local matrix otherwise
TextureSampler fTextureSamplers[kMaxTextures];
SkISize fAtlasDimensions; // dimensions for all textures used with fTextureSamplers[].
Attribute fInPosition;
Attribute fInColor;
Attribute fInTextureCoords;
uint32_t fFlags;
GR_DECLARE_GEOMETRY_PROCESSOR_TEST
using INHERITED = GrGeometryProcessor;
};
/**
* 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 (GrSamplerState). The input
* coords are a custom attribute. Gamma correction is handled via a texture LUT.
*/
class GrDistanceFieldLCDTextGeoProc : public GrGeometryProcessor {
public:
inline static constexpr int kMaxTextures = 4;
struct DistanceAdjust {
SkScalar fR, fG, fB;
static DistanceAdjust Make(SkScalar r, SkScalar g, SkScalar b) {
DistanceAdjust result;
result.fR = r; result.fG = g; result.fB = b;
return result;
}
bool operator==(const DistanceAdjust& wa) const {
return (fR == wa.fR && fG == wa.fG && fB == wa.fB);
}
bool operator!=(const DistanceAdjust& wa) const {
return !(*this == wa);
}
};
static GrGeometryProcessor* Make(SkArenaAlloc* arena,
const GrShaderCaps& caps,
const GrSurfaceProxyView* views,
int numActiveViews,
GrSamplerState params,
DistanceAdjust distanceAdjust,
uint32_t flags,
const SkMatrix& localMatrixIfUsesLocalCoords) {
return arena->make([&](void* ptr) {
return new (ptr) GrDistanceFieldLCDTextGeoProc(caps, views, numActiveViews, params,
distanceAdjust, flags,
localMatrixIfUsesLocalCoords);
});
}
~GrDistanceFieldLCDTextGeoProc() override {}
const char* name() const override { return "DistanceFieldLCDText"; }
void addNewViews(const GrSurfaceProxyView*, int numActiveViews, GrSamplerState);
void addToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override;
std::unique_ptr<ProgramImpl> makeProgramImpl(const GrShaderCaps&) const override;
private:
class Impl;
GrDistanceFieldLCDTextGeoProc(const GrShaderCaps& caps, const GrSurfaceProxyView* views,
int numActiveViews, GrSamplerState params, DistanceAdjust wa,
uint32_t flags, const SkMatrix& localMatrix);
const TextureSampler& onTextureSampler(int i) const override { return fTextureSamplers[i]; }
TextureSampler fTextureSamplers[kMaxTextures];
SkISize fAtlasDimensions; // dimensions for all textures used with fTextureSamplers[].
const SkMatrix fLocalMatrix;
DistanceAdjust fDistanceAdjust;
Attribute fInPosition;
Attribute fInColor;
Attribute fInTextureCoords;
uint32_t fFlags;
GR_DECLARE_GEOMETRY_PROCESSOR_TEST
using INHERITED = GrGeometryProcessor;
};
#endif