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 GrDistanceFieldGeoProc_DEFINED 9 #define GrDistanceFieldGeoProc_DEFINED 10 11 #include "GrProcessor.h" 12 #include "GrGeometryProcessor.h" 13 14 class GrGLDistanceFieldA8TextGeoProc; 15 class GrGLDistanceFieldPathGeoProc; 16 class GrGLDistanceFieldLCDTextGeoProc; 17 class GrInvariantOutput; 18 19 enum GrDistanceFieldEffectFlags { 20 kSimilarity_DistanceFieldEffectFlag = 0x01, // ctm is similarity matrix 21 kRectToRect_DistanceFieldEffectFlag = 0x02, // ctm maps rects to rects 22 kUseLCD_DistanceFieldEffectFlag = 0x04, // use lcd text 23 kBGR_DistanceFieldEffectFlag = 0x08, // lcd display has bgr order 24 kPortrait_DistanceFieldEffectFlag = 0x10, // lcd display is in portrait mode (not used yet) 25 kColorAttr_DistanceFieldEffectFlag = 0x20, // color vertex attribute 26 27 kInvalid_DistanceFieldEffectFlag = 0x80, // invalid state (for initialization) 28 29 kUniformScale_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag | 30 kRectToRect_DistanceFieldEffectFlag, 31 // The subset of the flags relevant to GrDistanceFieldA8TextGeoProc 32 kNonLCD_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag | 33 kColorAttr_DistanceFieldEffectFlag, 34 // The subset of the flags relevant to GrDistanceFieldLCDTextGeoProc 35 kLCD_DistanceFieldEffectMask = kSimilarity_DistanceFieldEffectFlag | 36 kRectToRect_DistanceFieldEffectFlag | 37 kUseLCD_DistanceFieldEffectFlag | 38 kBGR_DistanceFieldEffectFlag, 39 }; 40 41 /** 42 * The output color of this effect is a modulation of the input color and a sample from a 43 * distance field texture (using a smoothed step function near 0.5). 44 * It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input 45 * coords are a custom attribute. Gamma correction is handled via a texture LUT. 46 */ 47 class GrDistanceFieldA8TextGeoProc : public GrGeometryProcessor { 48 public: 49 #ifdef SK_GAMMA_APPLY_TO_A8 50 static GrGeometryProcessor* Create(GrColor color, const SkMatrix& viewMatrix, 51 GrTexture* tex, const GrTextureParams& params, 52 float lum, uint32_t flags) { 53 return SkNEW_ARGS(GrDistanceFieldA8TextGeoProc, (color, viewMatrix, tex, params, lum, 54 flags)); 55 } 56 #else 57 static GrGeometryProcessor* Create(GrColor color, const SkMatrix& viewMatrix, 58 GrTexture* tex, const GrTextureParams& params, 59 uint32_t flags) { 60 return SkNEW_ARGS(GrDistanceFieldA8TextGeoProc, (color, viewMatrix, tex, params, flags)); 61 } 62 #endif 63 64 virtual ~GrDistanceFieldA8TextGeoProc() {} 65 66 const char* name() const override { return "DistanceFieldTexture"; } 67 68 const Attribute* inPosition() const { return fInPosition; } 69 const Attribute* inColor() const { return fInColor; } 70 const Attribute* inTextureCoords() const { return fInTextureCoords; } 71 GrColor color() const { return fColor; } 72 const SkMatrix& viewMatrix() const { return fViewMatrix; } 73 #ifdef SK_GAMMA_APPLY_TO_A8 74 float getDistanceAdjust() const { return fDistanceAdjust; } 75 #endif 76 uint32_t getFlags() const { return fFlags; } 77 78 virtual void getGLProcessorKey(const GrBatchTracker& bt, 79 const GrGLSLCaps& caps, 80 GrProcessorKeyBuilder* b) const override; 81 82 virtual GrGLPrimitiveProcessor* createGLInstance(const GrBatchTracker& bt, 83 const GrGLSLCaps&) const override; 84 85 void initBatchTracker(GrBatchTracker* bt, const GrPipelineInfo& init) const override; 86 87 private: 88 GrDistanceFieldA8TextGeoProc(GrColor, const SkMatrix& viewMatrix, 89 GrTexture* texture, const GrTextureParams& params, 90 #ifdef SK_GAMMA_APPLY_TO_A8 91 float distanceAdjust, 92 #endif 93 uint32_t flags); 94 95 GrColor fColor; 96 SkMatrix fViewMatrix; 97 GrTextureAccess fTextureAccess; 98 #ifdef SK_GAMMA_APPLY_TO_A8 99 float fDistanceAdjust; 100 #endif 101 uint32_t fFlags; 102 const Attribute* fInPosition; 103 const Attribute* fInColor; 104 const Attribute* fInTextureCoords; 105 106 GR_DECLARE_GEOMETRY_PROCESSOR_TEST; 107 108 typedef GrGeometryProcessor INHERITED; 109 }; 110 111 112 /** 113 * The output color of this effect is a modulation of the input color and a sample from a 114 * distance field texture (using a smoothed step function near 0.5). 115 * It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input 116 * coords are a custom attribute. No gamma correct blending is applied. Used for paths only. 117 */ 118 class GrDistanceFieldPathGeoProc : public GrGeometryProcessor { 119 public: 120 static GrGeometryProcessor* Create(GrColor color, const SkMatrix& viewMatrix, GrTexture* tex, 121 const GrTextureParams& params, 122 uint32_t flags) { 123 return SkNEW_ARGS(GrDistanceFieldPathGeoProc, (color, viewMatrix, tex, params, flags)); 124 } 125 126 virtual ~GrDistanceFieldPathGeoProc() {} 127 128 const char* name() const override { return "DistanceFieldTexture"; } 129 130 const Attribute* inPosition() const { return fInPosition; } 131 const Attribute* inColor() const { return fInColor; } 132 const Attribute* inTextureCoords() const { return fInTextureCoords; } 133 GrColor color() const { return fColor; } 134 const SkMatrix& viewMatrix() const { return fViewMatrix; } 135 uint32_t getFlags() const { return fFlags; } 136 137 virtual void getGLProcessorKey(const GrBatchTracker& bt, 138 const GrGLSLCaps& caps, 139 GrProcessorKeyBuilder* b) const override; 140 141 virtual GrGLPrimitiveProcessor* createGLInstance(const GrBatchTracker& bt, 142 const GrGLSLCaps&) const override; 143 144 void initBatchTracker(GrBatchTracker* bt, const GrPipelineInfo& init) const override; 145 146 private: 147 GrDistanceFieldPathGeoProc(GrColor, const SkMatrix& viewMatrix, GrTexture* texture, 148 const GrTextureParams& params, uint32_t flags); 149 150 GrColor fColor; 151 SkMatrix fViewMatrix; 152 GrTextureAccess fTextureAccess; 153 uint32_t fFlags; 154 const Attribute* fInPosition; 155 const Attribute* fInColor; 156 const Attribute* fInTextureCoords; 157 158 GR_DECLARE_GEOMETRY_PROCESSOR_TEST; 159 160 typedef GrGeometryProcessor INHERITED; 161 }; 162 163 /** 164 * The output color of this effect is a modulation of the input color and samples from a 165 * distance field texture (using a smoothed step function near 0.5), adjusted for LCD displays. 166 * It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input 167 * coords are a custom attribute. Gamma correction is handled via a texture LUT. 168 */ 169 class GrDistanceFieldLCDTextGeoProc : public GrGeometryProcessor { 170 public: 171 struct DistanceAdjust { 172 SkScalar fR, fG, fB; 173 static DistanceAdjust Make(SkScalar r, SkScalar g, SkScalar b) { 174 DistanceAdjust result; 175 result.fR = r; result.fG = g; result.fB = b; 176 return result; 177 } 178 bool operator==(const DistanceAdjust& wa) const { 179 return (fR == wa.fR && fG == wa.fG && fB == wa.fB); 180 } 181 bool operator!=(const DistanceAdjust& wa) const { 182 return !(*this == wa); 183 } 184 }; 185 186 static GrGeometryProcessor* Create(GrColor color, const SkMatrix& viewMatrix, 187 GrTexture* tex, const GrTextureParams& params, 188 DistanceAdjust distanceAdjust, uint32_t flags) { 189 return SkNEW_ARGS(GrDistanceFieldLCDTextGeoProc, 190 (color, viewMatrix, tex, params, distanceAdjust, flags)); 191 } 192 193 virtual ~GrDistanceFieldLCDTextGeoProc() {} 194 195 const char* name() const override { return "DistanceFieldLCDTexture"; } 196 197 const Attribute* inPosition() const { return fInPosition; } 198 const Attribute* inTextureCoords() const { return fInTextureCoords; } 199 DistanceAdjust getDistanceAdjust() const { return fDistanceAdjust; } 200 GrColor color() const { return fColor; } 201 const SkMatrix& viewMatrix() const { return fViewMatrix; } 202 uint32_t getFlags() const { return fFlags; } 203 204 virtual void getGLProcessorKey(const GrBatchTracker& bt, 205 const GrGLSLCaps& caps, 206 GrProcessorKeyBuilder* b) const override; 207 208 virtual GrGLPrimitiveProcessor* createGLInstance(const GrBatchTracker& bt, 209 const GrGLSLCaps&) const override; 210 211 void initBatchTracker(GrBatchTracker* bt, const GrPipelineInfo& init) const override; 212 213 private: 214 GrDistanceFieldLCDTextGeoProc(GrColor, const SkMatrix& viewMatrix, 215 GrTexture* texture, const GrTextureParams& params, 216 DistanceAdjust wa, uint32_t flags); 217 218 GrColor fColor; 219 SkMatrix fViewMatrix; 220 GrTextureAccess fTextureAccess; 221 DistanceAdjust fDistanceAdjust; 222 uint32_t fFlags; 223 const Attribute* fInPosition; 224 const Attribute* fInTextureCoords; 225 226 GR_DECLARE_GEOMETRY_PROCESSOR_TEST; 227 228 typedef GrGeometryProcessor INHERITED; 229 }; 230 231 #endif 232
