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comparison: gfx/skia/trunk/src/effects/gradients/SkGradientShaderPriv.h
gfx/skia/trunk/src/effects/gradients/SkGradientShaderPriv.h
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| -1:000000000000 | 0:a38d9c6b7002 |
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| 1 /* | |
| 2 * Copyright 2012 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 SkGradientShaderPriv_DEFINED | |
| 9 #define SkGradientShaderPriv_DEFINED | |
| 10 | |
| 11 #include "SkGradientShader.h" | |
| 12 #include "SkClampRange.h" | |
| 13 #include "SkColorPriv.h" | |
| 14 #include "SkReadBuffer.h" | |
| 15 #include "SkWriteBuffer.h" | |
| 16 #include "SkMallocPixelRef.h" | |
| 17 #include "SkUnitMapper.h" | |
| 18 #include "SkUtils.h" | |
| 19 #include "SkTemplates.h" | |
| 20 #include "SkBitmapCache.h" | |
| 21 #include "SkShader.h" | |
| 22 | |
| 23 static inline void sk_memset32_dither(uint32_t dst[], uint32_t v0, uint32_t v1, | |
| 24 int count) { | |
| 25 if (count > 0) { | |
| 26 if (v0 == v1) { | |
| 27 sk_memset32(dst, v0, count); | |
| 28 } else { | |
| 29 int pairs = count >> 1; | |
| 30 for (int i = 0; i < pairs; i++) { | |
| 31 *dst++ = v0; | |
| 32 *dst++ = v1; | |
| 33 } | |
| 34 if (count & 1) { | |
| 35 *dst = v0; | |
| 36 } | |
| 37 } | |
| 38 } | |
| 39 } | |
| 40 | |
| 41 // Clamp | |
| 42 | |
| 43 static inline SkFixed clamp_tileproc(SkFixed x) { | |
| 44 return SkClampMax(x, 0xFFFF); | |
| 45 } | |
| 46 | |
| 47 // Repeat | |
| 48 | |
| 49 static inline SkFixed repeat_tileproc(SkFixed x) { | |
| 50 return x & 0xFFFF; | |
| 51 } | |
| 52 | |
| 53 // Mirror | |
| 54 | |
| 55 // Visual Studio 2010 (MSC_VER=1600) optimizes bit-shift code incorrectly. | |
| 56 // See http://code.google.com/p/skia/issues/detail?id=472 | |
| 57 #if defined(_MSC_VER) && (_MSC_VER >= 1600) | |
| 58 #pragma optimize("", off) | |
| 59 #endif | |
| 60 | |
| 61 static inline SkFixed mirror_tileproc(SkFixed x) { | |
| 62 int s = x << 15 >> 31; | |
| 63 return (x ^ s) & 0xFFFF; | |
| 64 } | |
| 65 | |
| 66 #if defined(_MSC_VER) && (_MSC_VER >= 1600) | |
| 67 #pragma optimize("", on) | |
| 68 #endif | |
| 69 | |
| 70 /////////////////////////////////////////////////////////////////////////////// | |
| 71 | |
| 72 typedef SkFixed (*TileProc)(SkFixed); | |
| 73 | |
| 74 /////////////////////////////////////////////////////////////////////////////// | |
| 75 | |
| 76 static const TileProc gTileProcs[] = { | |
| 77 clamp_tileproc, | |
| 78 repeat_tileproc, | |
| 79 mirror_tileproc | |
| 80 }; | |
| 81 | |
| 82 /////////////////////////////////////////////////////////////////////////////// | |
| 83 | |
| 84 class SkGradientShaderBase : public SkShader { | |
| 85 public: | |
| 86 struct Descriptor { | |
| 87 Descriptor() { | |
| 88 sk_bzero(this, sizeof(*this)); | |
| 89 fTileMode = SkShader::kClamp_TileMode; | |
| 90 } | |
| 91 | |
| 92 const SkColor* fColors; | |
| 93 const SkScalar* fPos; | |
| 94 int fCount; | |
| 95 SkShader::TileMode fTileMode; | |
| 96 SkUnitMapper* fMapper; | |
| 97 uint32_t fFlags; | |
| 98 }; | |
| 99 | |
| 100 public: | |
| 101 SkGradientShaderBase(const Descriptor& desc); | |
| 102 virtual ~SkGradientShaderBase(); | |
| 103 | |
| 104 virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&) SK_OVERRIDE; | |
| 105 virtual uint32_t getFlags() SK_OVERRIDE { return fFlags; } | |
| 106 virtual bool isOpaque() const SK_OVERRIDE; | |
| 107 | |
| 108 void getGradientTableBitmap(SkBitmap*) const; | |
| 109 | |
| 110 enum { | |
| 111 /// Seems like enough for visual accuracy. TODO: if pos[] deserves | |
| 112 /// it, use a larger cache. | |
| 113 kCache16Bits = 8, | |
| 114 kCache16Count = (1 << kCache16Bits), | |
| 115 kCache16Shift = 16 - kCache16Bits, | |
| 116 kSqrt16Shift = 8 - kCache16Bits, | |
| 117 | |
| 118 /// Seems like enough for visual accuracy. TODO: if pos[] deserves | |
| 119 /// it, use a larger cache. | |
| 120 kCache32Bits = 8, | |
| 121 kCache32Count = (1 << kCache32Bits), | |
| 122 kCache32Shift = 16 - kCache32Bits, | |
| 123 kSqrt32Shift = 8 - kCache32Bits, | |
| 124 | |
| 125 /// This value is used to *read* the dither cache; it may be 0 | |
| 126 /// if dithering is disabled. | |
| 127 kDitherStride32 = kCache32Count, | |
| 128 kDitherStride16 = kCache16Count, | |
| 129 }; | |
| 130 | |
| 131 | |
| 132 protected: | |
| 133 SkGradientShaderBase(SkReadBuffer& ); | |
| 134 virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE; | |
| 135 SK_TO_STRING_OVERRIDE() | |
| 136 | |
| 137 SkUnitMapper* fMapper; | |
| 138 SkMatrix fPtsToUnit; // set by subclass | |
| 139 SkMatrix fDstToIndex; | |
| 140 SkMatrix::MapXYProc fDstToIndexProc; | |
| 141 TileMode fTileMode; | |
| 142 TileProc fTileProc; | |
| 143 int fColorCount; | |
| 144 uint8_t fDstToIndexClass; | |
| 145 uint8_t fFlags; | |
| 146 uint8_t fGradFlags; | |
| 147 | |
| 148 struct Rec { | |
| 149 SkFixed fPos; // 0...1 | |
| 150 uint32_t fScale; // (1 << 24) / range | |
| 151 }; | |
| 152 Rec* fRecs; | |
| 153 | |
| 154 const uint16_t* getCache16() const; | |
| 155 const SkPMColor* getCache32() const; | |
| 156 | |
| 157 void commonAsAGradient(GradientInfo*) const; | |
| 158 | |
| 159 private: | |
| 160 enum { | |
| 161 kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space | |
| 162 | |
| 163 kStorageSize = kColorStorageCount * (sizeof(SkColor) + sizeof(Rec)) | |
| 164 }; | |
| 165 SkColor fStorage[(kStorageSize + 3) >> 2]; | |
| 166 SkColor* fOrigColors; // original colors, before modulation by paint in setContext | |
| 167 bool fColorsAreOpaque; | |
| 168 | |
| 169 mutable uint16_t* fCache16; // working ptr. If this is NULL, we need to recompute the cache values | |
| 170 mutable SkPMColor* fCache32; // working ptr. If this is NULL, we need to recompute the cache values | |
| 171 | |
| 172 mutable uint16_t* fCache16Storage; // storage for fCache16, allocated on demand | |
| 173 mutable SkMallocPixelRef* fCache32PixelRef; | |
| 174 mutable unsigned fCacheAlpha; // the alpha value we used when we computed the cache. larger than 8bits so we can store uninitialized value | |
| 175 | |
| 176 static void Build16bitCache(uint16_t[], SkColor c0, SkColor c1, int count); | |
| 177 static void Build32bitCache(SkPMColor[], SkColor c0, SkColor c1, int count, | |
| 178 U8CPU alpha, uint32_t gradFlags); | |
| 179 void setCacheAlpha(U8CPU alpha) const; | |
| 180 void initCommon(); | |
| 181 | |
| 182 typedef SkShader INHERITED; | |
| 183 }; | |
| 184 | |
| 185 static inline int init_dither_toggle(int x, int y) { | |
| 186 x &= 1; | |
| 187 y = (y & 1) << 1; | |
| 188 return (x | y) * SkGradientShaderBase::kDitherStride32; | |
| 189 } | |
| 190 | |
| 191 static inline int next_dither_toggle(int toggle) { | |
| 192 return toggle ^ SkGradientShaderBase::kDitherStride32; | |
| 193 } | |
| 194 | |
| 195 static inline int init_dither_toggle16(int x, int y) { | |
| 196 return ((x ^ y) & 1) * SkGradientShaderBase::kDitherStride16; | |
| 197 } | |
| 198 | |
| 199 static inline int next_dither_toggle16(int toggle) { | |
| 200 return toggle ^ SkGradientShaderBase::kDitherStride16; | |
| 201 } | |
| 202 | |
| 203 /////////////////////////////////////////////////////////////////////////////// | |
| 204 | |
| 205 #if SK_SUPPORT_GPU | |
| 206 | |
| 207 #include "GrCoordTransform.h" | |
| 208 #include "gl/GrGLEffect.h" | |
| 209 | |
| 210 class GrEffectStage; | |
| 211 class GrBackendEffectFactory; | |
| 212 | |
| 213 /* | |
| 214 * The interpretation of the texture matrix depends on the sample mode. The | |
| 215 * texture matrix is applied both when the texture coordinates are explicit | |
| 216 * and when vertex positions are used as texture coordinates. In the latter | |
| 217 * case the texture matrix is applied to the pre-view-matrix position | |
| 218 * values. | |
| 219 * | |
| 220 * Normal SampleMode | |
| 221 * The post-matrix texture coordinates are in normalize space with (0,0) at | |
| 222 * the top-left and (1,1) at the bottom right. | |
| 223 * RadialGradient | |
| 224 * The matrix specifies the radial gradient parameters. | |
| 225 * (0,0) in the post-matrix space is center of the radial gradient. | |
| 226 * Radial2Gradient | |
| 227 * Matrix transforms to space where first circle is centered at the | |
| 228 * origin. The second circle will be centered (x, 0) where x may be | |
| 229 * 0 and is provided by setRadial2Params. The post-matrix space is | |
| 230 * normalized such that 1 is the second radius - first radius. | |
| 231 * SweepGradient | |
| 232 * The angle from the origin of texture coordinates in post-matrix space | |
| 233 * determines the gradient value. | |
| 234 */ | |
| 235 | |
| 236 class GrTextureStripAtlas; | |
| 237 | |
| 238 // Base class for Gr gradient effects | |
| 239 class GrGradientEffect : public GrEffect { | |
| 240 public: | |
| 241 | |
| 242 GrGradientEffect(GrContext* ctx, | |
| 243 const SkGradientShaderBase& shader, | |
| 244 const SkMatrix& matrix, | |
| 245 SkShader::TileMode tileMode); | |
| 246 | |
| 247 virtual ~GrGradientEffect(); | |
| 248 | |
| 249 bool useAtlas() const { return SkToBool(-1 != fRow); } | |
| 250 SkScalar getYCoord() const { return fYCoord; }; | |
| 251 | |
| 252 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; | |
| 253 | |
| 254 enum ColorType { | |
| 255 kTwo_ColorType, | |
| 256 kThree_ColorType, | |
| 257 kTexture_ColorType | |
| 258 }; | |
| 259 | |
| 260 ColorType getColorType() const { return fColorType; } | |
| 261 | |
| 262 enum PremulType { | |
| 263 kBeforeInterp_PremulType, | |
| 264 kAfterInterp_PremulType, | |
| 265 }; | |
| 266 | |
| 267 PremulType getPremulType() const { return fPremulType; } | |
| 268 | |
| 269 const SkColor* getColors(int pos) const { | |
| 270 SkASSERT(fColorType != kTexture_ColorType); | |
| 271 SkASSERT((pos-1) <= fColorType); | |
| 272 return &fColors[pos]; | |
| 273 } | |
| 274 | |
| 275 protected: | |
| 276 | |
| 277 /** Populates a pair of arrays with colors and stop info to construct a random gradient. | |
| 278 The function decides whether stop values should be used or not. The return value indicates | |
| 279 the number of colors, which will be capped by kMaxRandomGradientColors. colors should be | |
| 280 sized to be at least kMaxRandomGradientColors. stops is a pointer to an array of at least | |
| 281 size kMaxRandomGradientColors. It may be updated to NULL, indicating that NULL should be | |
| 282 passed to the gradient factory rather than the array. | |
| 283 */ | |
| 284 static const int kMaxRandomGradientColors = 4; | |
| 285 static int RandomGradientParams(SkRandom* r, | |
| 286 SkColor colors[kMaxRandomGradientColors], | |
| 287 SkScalar** stops, | |
| 288 SkShader::TileMode* tm); | |
| 289 | |
| 290 virtual bool onIsEqual(const GrEffect& effect) const SK_OVERRIDE; | |
| 291 | |
| 292 const GrCoordTransform& getCoordTransform() const { return fCoordTransform; } | |
| 293 | |
| 294 private: | |
| 295 static const GrCoordSet kCoordSet = kLocal_GrCoordSet; | |
| 296 | |
| 297 enum { | |
| 298 kMaxAnalyticColors = 3 // if more colors use texture | |
| 299 }; | |
| 300 | |
| 301 GrCoordTransform fCoordTransform; | |
| 302 GrTextureAccess fTextureAccess; | |
| 303 SkScalar fYCoord; | |
| 304 GrTextureStripAtlas* fAtlas; | |
| 305 int fRow; | |
| 306 bool fIsOpaque; | |
| 307 ColorType fColorType; | |
| 308 SkColor fColors[kMaxAnalyticColors]; | |
| 309 PremulType fPremulType; // This only changes behavior for two and three color special cases. | |
| 310 // It is already baked into to the table for texture gradients. | |
| 311 typedef GrEffect INHERITED; | |
| 312 | |
| 313 }; | |
| 314 | |
| 315 /////////////////////////////////////////////////////////////////////////////// | |
| 316 | |
| 317 // Base class for GL gradient effects | |
| 318 class GrGLGradientEffect : public GrGLEffect { | |
| 319 public: | |
| 320 GrGLGradientEffect(const GrBackendEffectFactory& factory); | |
| 321 virtual ~GrGLGradientEffect(); | |
| 322 | |
| 323 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; | |
| 324 | |
| 325 protected: | |
| 326 enum { | |
| 327 kPremulTypeKeyBitCnt = 1, | |
| 328 kPremulTypeMask = 1, | |
| 329 kPremulBeforeInterpKey = kPremulTypeMask, | |
| 330 | |
| 331 kTwoColorKey = 2 << kPremulTypeKeyBitCnt, | |
| 332 kThreeColorKey = 3 << kPremulTypeKeyBitCnt, | |
| 333 kColorKeyMask = kTwoColorKey | kThreeColorKey, | |
| 334 kColorKeyBitCnt = 2, | |
| 335 | |
| 336 // Subclasses must shift any key bits they produce up by this amount | |
| 337 // and combine with the result of GenBaseGradientKey. | |
| 338 kBaseKeyBitCnt = (kPremulTypeKeyBitCnt + kColorKeyBitCnt) | |
| 339 }; | |
| 340 | |
| 341 static GrGradientEffect::ColorType ColorTypeFromKey(EffectKey key){ | |
| 342 if (kTwoColorKey == (key & kColorKeyMask)) { | |
| 343 return GrGradientEffect::kTwo_ColorType; | |
| 344 } else if (kThreeColorKey == (key & kColorKeyMask)) { | |
| 345 return GrGradientEffect::kThree_ColorType; | |
| 346 } else {return GrGradientEffect::kTexture_ColorType;} | |
| 347 } | |
| 348 | |
| 349 static GrGradientEffect::PremulType PremulTypeFromKey(EffectKey key){ | |
| 350 if (kPremulBeforeInterpKey == (key & kPremulTypeMask)) { | |
| 351 return GrGradientEffect::kBeforeInterp_PremulType; | |
| 352 } else { | |
| 353 return GrGradientEffect::kAfterInterp_PremulType; | |
| 354 } | |
| 355 } | |
| 356 | |
| 357 /** | |
| 358 * Subclasses must call this. It will return a value restricted to the lower kBaseKeyBitCnt | |
| 359 * bits. | |
| 360 */ | |
| 361 static EffectKey GenBaseGradientKey(const GrDrawEffect&); | |
| 362 | |
| 363 // Emits the uniform used as the y-coord to texture samples in derived classes. Subclasses | |
| 364 // should call this method from their emitCode(). | |
| 365 void emitUniforms(GrGLShaderBuilder* builder, EffectKey key); | |
| 366 | |
| 367 | |
| 368 // emit code that gets a fragment's color from an expression for t; Has branches for 3 separate | |
| 369 // control flows inside -- 2 color gradients, 3 color symmetric gradients (both using | |
| 370 // native GLSL mix), and 4+ color gradients that use the traditional texture lookup. | |
| 371 void emitColor(GrGLShaderBuilder* builder, | |
| 372 const char* gradientTValue, | |
| 373 EffectKey key, | |
| 374 const char* outputColor, | |
| 375 const char* inputColor, | |
| 376 const TextureSamplerArray& samplers); | |
| 377 | |
| 378 private: | |
| 379 SkScalar fCachedYCoord; | |
| 380 GrGLUniformManager::UniformHandle fFSYUni; | |
| 381 GrGLUniformManager::UniformHandle fColorStartUni; | |
| 382 GrGLUniformManager::UniformHandle fColorMidUni; | |
| 383 GrGLUniformManager::UniformHandle fColorEndUni; | |
| 384 | |
| 385 typedef GrGLEffect INHERITED; | |
| 386 }; | |
| 387 | |
| 388 #endif | |
| 389 | |
| 390 #endif |
