1 /* 2 * Copyright 2014 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 #include "gl/builders/GrGLProgramBuilder.h" 9 #include "GrRRectEffect.h" 10 11 #include "gl/GrGLProcessor.h" 12 #include "gl/GrGLSL.h" 13 #include "GrConvexPolyEffect.h" 14 #include "GrOvalEffect.h" 15 #include "GrTBackendProcessorFactory.h" 16 17 #include "SkRRect.h" 18 19 // The effects defined here only handle rrect radii >= kRadiusMin. 20 static const SkScalar kRadiusMin = SK_ScalarHalf; 21 22 ////////////////////////////////////////////////////////////////////////////// 23 24 class GLCircularRRectEffect; 25 26 class CircularRRectEffect : public GrFragmentProcessor { 27 public: 28 29 enum CornerFlags { 30 kTopLeft_CornerFlag = (1 << SkRRect::kUpperLeft_Corner), 31 kTopRight_CornerFlag = (1 << SkRRect::kUpperRight_Corner), 32 kBottomRight_CornerFlag = (1 << SkRRect::kLowerRight_Corner), 33 kBottomLeft_CornerFlag = (1 << SkRRect::kLowerLeft_Corner), 34 35 kLeft_CornerFlags = kTopLeft_CornerFlag | kBottomLeft_CornerFlag, 36 kTop_CornerFlags = kTopLeft_CornerFlag | kTopRight_CornerFlag, 37 kRight_CornerFlags = kTopRight_CornerFlag | kBottomRight_CornerFlag, 38 kBottom_CornerFlags = kBottomLeft_CornerFlag | kBottomRight_CornerFlag, 39 40 kAll_CornerFlags = kTopLeft_CornerFlag | kTopRight_CornerFlag | 41 kBottomLeft_CornerFlag | kBottomRight_CornerFlag, 42 43 kNone_CornerFlags = 0 44 }; 45 46 // The flags are used to indicate which corners are circluar (unflagged corners are assumed to 47 // be square). 48 static GrFragmentProcessor* Create(GrPrimitiveEdgeType, uint32_t circularCornerFlags, 49 const SkRRect&); 50 51 virtual ~CircularRRectEffect() {}; 52 static const char* Name() { return "CircularRRect"; } 53 54 const SkRRect& getRRect() const { return fRRect; } 55 56 uint32_t getCircularCornerFlags() const { return fCircularCornerFlags; } 57 58 GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } 59 60 typedef GLCircularRRectEffect GLProcessor; 61 62 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 63 64 virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE; 65 66 private: 67 CircularRRectEffect(GrPrimitiveEdgeType, uint32_t circularCornerFlags, const SkRRect&); 68 69 virtual bool onIsEqual(const GrProcessor& other) const SK_OVERRIDE; 70 71 SkRRect fRRect; 72 GrPrimitiveEdgeType fEdgeType; 73 uint32_t fCircularCornerFlags; 74 75 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 76 77 typedef GrFragmentProcessor INHERITED; 78 }; 79 80 GrFragmentProcessor* CircularRRectEffect::Create(GrPrimitiveEdgeType edgeType, 81 uint32_t circularCornerFlags, 82 const SkRRect& rrect) { 83 if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) { 84 return NULL; 85 } 86 return SkNEW_ARGS(CircularRRectEffect, (edgeType, circularCornerFlags, rrect)); 87 } 88 89 void CircularRRectEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { 90 *validFlags = 0; 91 } 92 93 const GrBackendFragmentProcessorFactory& CircularRRectEffect::getFactory() const { 94 return GrTBackendFragmentProcessorFactory<CircularRRectEffect>::getInstance(); 95 } 96 97 CircularRRectEffect::CircularRRectEffect(GrPrimitiveEdgeType edgeType, uint32_t circularCornerFlags, 98 const SkRRect& rrect) 99 : fRRect(rrect) 100 , fEdgeType(edgeType) 101 , fCircularCornerFlags(circularCornerFlags) { 102 this->setWillReadFragmentPosition(); 103 } 104 105 bool CircularRRectEffect::onIsEqual(const GrProcessor& other) const { 106 const CircularRRectEffect& crre = other.cast<CircularRRectEffect>(); 107 // The corner flags are derived from fRRect, so no need to check them. 108 return fEdgeType == crre.fEdgeType && fRRect == crre.fRRect; 109 } 110 111 ////////////////////////////////////////////////////////////////////////////// 112 113 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(CircularRRectEffect); 114 115 GrFragmentProcessor* CircularRRectEffect::TestCreate(SkRandom* random, 116 GrContext*, 117 const GrDrawTargetCaps& caps, 118 GrTexture*[]) { 119 SkScalar w = random->nextRangeScalar(20.f, 1000.f); 120 SkScalar h = random->nextRangeScalar(20.f, 1000.f); 121 SkScalar r = random->nextRangeF(kRadiusMin, 9.f); 122 SkRRect rrect; 123 rrect.setRectXY(SkRect::MakeWH(w, h), r, r); 124 GrFragmentProcessor* fp; 125 do { 126 GrPrimitiveEdgeType et = 127 (GrPrimitiveEdgeType)random->nextULessThan(kGrProcessorEdgeTypeCnt); 128 fp = GrRRectEffect::Create(et, rrect); 129 } while (NULL == fp); 130 return fp; 131 } 132 133 ////////////////////////////////////////////////////////////////////////////// 134 135 class GLCircularRRectEffect : public GrGLFragmentProcessor { 136 public: 137 GLCircularRRectEffect(const GrBackendProcessorFactory&, const GrProcessor&); 138 139 virtual void emitCode(GrGLProgramBuilder* builder, 140 const GrFragmentProcessor& fp, 141 const GrProcessorKey& key, 142 const char* outputColor, 143 const char* inputColor, 144 const TransformedCoordsArray&, 145 const TextureSamplerArray&) SK_OVERRIDE; 146 147 static inline void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKeyBuilder*); 148 149 virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE; 150 151 private: 152 GrGLProgramDataManager::UniformHandle fInnerRectUniform; 153 GrGLProgramDataManager::UniformHandle fRadiusPlusHalfUniform; 154 SkRRect fPrevRRect; 155 typedef GrGLFragmentProcessor INHERITED; 156 }; 157 158 GLCircularRRectEffect::GLCircularRRectEffect(const GrBackendProcessorFactory& factory, 159 const GrProcessor& ) 160 : INHERITED (factory) { 161 fPrevRRect.setEmpty(); 162 } 163 164 void GLCircularRRectEffect::emitCode(GrGLProgramBuilder* builder, 165 const GrFragmentProcessor& fp, 166 const GrProcessorKey& key, 167 const char* outputColor, 168 const char* inputColor, 169 const TransformedCoordsArray&, 170 const TextureSamplerArray& samplers) { 171 const CircularRRectEffect& crre = fp.cast<CircularRRectEffect>(); 172 const char *rectName; 173 const char *radiusPlusHalfName; 174 // The inner rect is the rrect bounds inset by the radius. Its left, top, right, and bottom 175 // edges correspond to components x, y, z, and w, respectively. When a side of the rrect has 176 // only rectangular corners, that side's value corresponds to the rect edge's value outset by 177 // half a pixel. 178 fInnerRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 179 kVec4f_GrSLType, 180 "innerRect", 181 &rectName); 182 fRadiusPlusHalfUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 183 kFloat_GrSLType, 184 "radiusPlusHalf", 185 &radiusPlusHalfName); 186 187 GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); 188 const char* fragmentPos = fsBuilder->fragmentPosition(); 189 // At each quarter-circle corner we compute a vector that is the offset of the fragment position 190 // from the circle center. The vector is pinned in x and y to be in the quarter-plane relevant 191 // to that corner. This means that points near the interior near the rrect top edge will have 192 // a vector that points straight up for both the TL left and TR corners. Computing an 193 // alpha from this vector at either the TR or TL corner will give the correct result. Similarly, 194 // fragments near the other three edges will get the correct AA. Fragments in the interior of 195 // the rrect will have a (0,0) vector at all four corners. So long as the radius > 0.5 they will 196 // correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas. 197 // The code below is a simplified version of the above that performs maxs on the vector 198 // components before computing distances and alpha values so that only one distance computation 199 // need be computed to determine the min alpha. 200 // 201 // For the cases where one half of the rrect is rectangular we drop one of the x or y 202 // computations, compute a separate rect edge alpha for the rect side, and mul the two computed 203 // alphas together. 204 switch (crre.getCircularCornerFlags()) { 205 case CircularRRectEffect::kAll_CornerFlags: 206 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos); 207 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName); 208 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n"); 209 fsBuilder->codeAppendf("\t\tfloat alpha = clamp(%s - length(dxy), 0.0, 1.0);\n", 210 radiusPlusHalfName); 211 break; 212 case CircularRRectEffect::kTopLeft_CornerFlag: 213 fsBuilder->codeAppendf("\t\tvec2 dxy = max(%s.xy - %s.xy, 0.0);\n", 214 rectName, fragmentPos); 215 fsBuilder->codeAppendf("\t\tfloat rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);\n", 216 rectName, fragmentPos); 217 fsBuilder->codeAppendf("\t\tfloat bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);\n", 218 rectName, fragmentPos); 219 fsBuilder->codeAppendf("\t\tfloat alpha = bottomAlpha * rightAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 220 radiusPlusHalfName); 221 break; 222 case CircularRRectEffect::kTopRight_CornerFlag: 223 fsBuilder->codeAppendf("\t\tvec2 dxy = max(vec2(%s.x - %s.z, %s.y - %s.y), 0.0);\n", 224 fragmentPos, rectName, rectName, fragmentPos); 225 fsBuilder->codeAppendf("\t\tfloat leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);\n", 226 fragmentPos, rectName); 227 fsBuilder->codeAppendf("\t\tfloat bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);\n", 228 rectName, fragmentPos); 229 fsBuilder->codeAppendf("\t\tfloat alpha = bottomAlpha * leftAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 230 radiusPlusHalfName); 231 break; 232 case CircularRRectEffect::kBottomRight_CornerFlag: 233 fsBuilder->codeAppendf("\t\tvec2 dxy = max(%s.xy - %s.zw, 0.0);\n", 234 fragmentPos, rectName); 235 fsBuilder->codeAppendf("\t\tfloat leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);\n", 236 fragmentPos, rectName); 237 fsBuilder->codeAppendf("\t\tfloat topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);\n", 238 fragmentPos, rectName); 239 fsBuilder->codeAppendf("\t\tfloat alpha = topAlpha * leftAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 240 radiusPlusHalfName); 241 break; 242 case CircularRRectEffect::kBottomLeft_CornerFlag: 243 fsBuilder->codeAppendf("\t\tvec2 dxy = max(vec2(%s.x - %s.x, %s.y - %s.w), 0.0);\n", 244 rectName, fragmentPos, fragmentPos, rectName); 245 fsBuilder->codeAppendf("\t\tfloat rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);\n", 246 rectName, fragmentPos); 247 fsBuilder->codeAppendf("\t\tfloat topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);\n", 248 fragmentPos, rectName); 249 fsBuilder->codeAppendf("\t\tfloat alpha = topAlpha * rightAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 250 radiusPlusHalfName); 251 break; 252 case CircularRRectEffect::kLeft_CornerFlags: 253 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos); 254 fsBuilder->codeAppendf("\t\tfloat dy1 = %s.y - %s.w;\n", fragmentPos, rectName); 255 fsBuilder->codeAppend("\t\tvec2 dxy = max(vec2(dxy0.x, max(dxy0.y, dy1)), 0.0);\n"); 256 fsBuilder->codeAppendf("\t\tfloat rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);\n", 257 rectName, fragmentPos); 258 fsBuilder->codeAppendf("\t\tfloat alpha = rightAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 259 radiusPlusHalfName); 260 break; 261 case CircularRRectEffect::kTop_CornerFlags: 262 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos); 263 fsBuilder->codeAppendf("\t\tfloat dx1 = %s.x - %s.z;\n", fragmentPos, rectName); 264 fsBuilder->codeAppend("\t\tvec2 dxy = max(vec2(max(dxy0.x, dx1), dxy0.y), 0.0);\n"); 265 fsBuilder->codeAppendf("\t\tfloat bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);\n", 266 rectName, fragmentPos); 267 fsBuilder->codeAppendf("\t\tfloat alpha = bottomAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 268 radiusPlusHalfName); 269 break; 270 case CircularRRectEffect::kRight_CornerFlags: 271 fsBuilder->codeAppendf("\t\tfloat dy0 = %s.y - %s.y;\n", rectName, fragmentPos); 272 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName); 273 fsBuilder->codeAppend("\t\tvec2 dxy = max(vec2(dxy1.x, max(dy0, dxy1.y)), 0.0);\n"); 274 fsBuilder->codeAppendf("\t\tfloat leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);\n", 275 fragmentPos, rectName); 276 fsBuilder->codeAppendf("\t\tfloat alpha = leftAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 277 radiusPlusHalfName); 278 break; 279 case CircularRRectEffect::kBottom_CornerFlags: 280 fsBuilder->codeAppendf("\t\tfloat dx0 = %s.x - %s.x;\n", rectName, fragmentPos); 281 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName); 282 fsBuilder->codeAppend("\t\tvec2 dxy = max(vec2(max(dx0, dxy1.x), dxy1.y), 0.0);\n"); 283 fsBuilder->codeAppendf("\t\tfloat topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);\n", 284 fragmentPos, rectName); 285 fsBuilder->codeAppendf("\t\tfloat alpha = topAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 286 radiusPlusHalfName); 287 break; 288 } 289 290 if (kInverseFillAA_GrProcessorEdgeType == crre.getEdgeType()) { 291 fsBuilder->codeAppend("\t\talpha = 1.0 - alpha;\n"); 292 } 293 294 fsBuilder->codeAppendf("\t\t%s = %s;\n", outputColor, 295 (GrGLSLExpr4(inputColor) * GrGLSLExpr1("alpha")).c_str()); 296 } 297 298 void GLCircularRRectEffect::GenKey(const GrProcessor& processor, const GrGLCaps&, 299 GrProcessorKeyBuilder* b) { 300 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>(); 301 GR_STATIC_ASSERT(kGrProcessorEdgeTypeCnt <= 8); 302 b->add32((crre.getCircularCornerFlags() << 3) | crre.getEdgeType()); 303 } 304 305 void GLCircularRRectEffect::setData(const GrGLProgramDataManager& pdman, 306 const GrProcessor& processor) { 307 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>(); 308 const SkRRect& rrect = crre.getRRect(); 309 if (rrect != fPrevRRect) { 310 SkRect rect = rrect.getBounds(); 311 SkScalar radius = 0; 312 switch (crre.getCircularCornerFlags()) { 313 case CircularRRectEffect::kAll_CornerFlags: 314 SkASSERT(rrect.isSimpleCircular()); 315 radius = rrect.getSimpleRadii().fX; 316 SkASSERT(radius >= kRadiusMin); 317 rect.inset(radius, radius); 318 break; 319 case CircularRRectEffect::kTopLeft_CornerFlag: 320 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 321 rect.fLeft += radius; 322 rect.fTop += radius; 323 rect.fRight += 0.5f; 324 rect.fBottom += 0.5f; 325 break; 326 case CircularRRectEffect::kTopRight_CornerFlag: 327 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX; 328 rect.fLeft -= 0.5f; 329 rect.fTop += radius; 330 rect.fRight -= radius; 331 rect.fBottom += 0.5f; 332 break; 333 case CircularRRectEffect::kBottomRight_CornerFlag: 334 radius = rrect.radii(SkRRect::kLowerRight_Corner).fX; 335 rect.fLeft -= 0.5f; 336 rect.fTop -= 0.5f; 337 rect.fRight -= radius; 338 rect.fBottom -= radius; 339 break; 340 case CircularRRectEffect::kBottomLeft_CornerFlag: 341 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX; 342 rect.fLeft += radius; 343 rect.fTop -= 0.5f; 344 rect.fRight += 0.5f; 345 rect.fBottom -= radius; 346 break; 347 case CircularRRectEffect::kLeft_CornerFlags: 348 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 349 rect.fLeft += radius; 350 rect.fTop += radius; 351 rect.fRight += 0.5f; 352 rect.fBottom -= radius; 353 break; 354 case CircularRRectEffect::kTop_CornerFlags: 355 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 356 rect.fLeft += radius; 357 rect.fTop += radius; 358 rect.fRight -= radius; 359 rect.fBottom += 0.5f; 360 break; 361 case CircularRRectEffect::kRight_CornerFlags: 362 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX; 363 rect.fLeft -= 0.5f; 364 rect.fTop += radius; 365 rect.fRight -= radius; 366 rect.fBottom -= radius; 367 break; 368 case CircularRRectEffect::kBottom_CornerFlags: 369 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX; 370 rect.fLeft += radius; 371 rect.fTop -= 0.5f; 372 rect.fRight -= radius; 373 rect.fBottom -= radius; 374 break; 375 default: 376 SkFAIL("Should have been one of the above cases."); 377 } 378 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom); 379 pdman.set1f(fRadiusPlusHalfUniform, radius + 0.5f); 380 fPrevRRect = rrect; 381 } 382 } 383 384 ////////////////////////////////////////////////////////////////////////////// 385 386 class GLEllipticalRRectEffect; 387 388 class EllipticalRRectEffect : public GrFragmentProcessor { 389 public: 390 static GrFragmentProcessor* Create(GrPrimitiveEdgeType, const SkRRect&); 391 392 virtual ~EllipticalRRectEffect() {}; 393 static const char* Name() { return "EllipticalRRect"; } 394 395 const SkRRect& getRRect() const { return fRRect; } 396 397 398 GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } 399 400 typedef GLEllipticalRRectEffect GLProcessor; 401 402 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 403 404 virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE; 405 406 private: 407 EllipticalRRectEffect(GrPrimitiveEdgeType, const SkRRect&); 408 409 virtual bool onIsEqual(const GrProcessor& other) const SK_OVERRIDE; 410 411 SkRRect fRRect; 412 GrPrimitiveEdgeType fEdgeType; 413 414 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 415 416 typedef GrFragmentProcessor INHERITED; 417 }; 418 419 GrFragmentProcessor* 420 EllipticalRRectEffect::Create(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) { 421 if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) { 422 return NULL; 423 } 424 return SkNEW_ARGS(EllipticalRRectEffect, (edgeType, rrect)); 425 } 426 427 void EllipticalRRectEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { 428 *validFlags = 0; 429 } 430 431 const GrBackendFragmentProcessorFactory& EllipticalRRectEffect::getFactory() const { 432 return GrTBackendFragmentProcessorFactory<EllipticalRRectEffect>::getInstance(); 433 } 434 435 EllipticalRRectEffect::EllipticalRRectEffect(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) 436 : fRRect(rrect) 437 , fEdgeType(edgeType){ 438 this->setWillReadFragmentPosition(); 439 } 440 441 bool EllipticalRRectEffect::onIsEqual(const GrProcessor& other) const { 442 const EllipticalRRectEffect& erre = other.cast<EllipticalRRectEffect>(); 443 return fEdgeType == erre.fEdgeType && fRRect == erre.fRRect; 444 } 445 446 ////////////////////////////////////////////////////////////////////////////// 447 448 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(EllipticalRRectEffect); 449 450 GrFragmentProcessor* EllipticalRRectEffect::TestCreate(SkRandom* random, 451 GrContext*, 452 const GrDrawTargetCaps& caps, 453 GrTexture*[]) { 454 SkScalar w = random->nextRangeScalar(20.f, 1000.f); 455 SkScalar h = random->nextRangeScalar(20.f, 1000.f); 456 SkVector r[4]; 457 r[SkRRect::kUpperLeft_Corner].fX = random->nextRangeF(kRadiusMin, 9.f); 458 // ensure at least one corner really is elliptical 459 do { 460 r[SkRRect::kUpperLeft_Corner].fY = random->nextRangeF(kRadiusMin, 9.f); 461 } while (r[SkRRect::kUpperLeft_Corner].fY == r[SkRRect::kUpperLeft_Corner].fX); 462 463 SkRRect rrect; 464 if (random->nextBool()) { 465 // half the time create a four-radii rrect. 466 r[SkRRect::kLowerRight_Corner].fX = random->nextRangeF(kRadiusMin, 9.f); 467 r[SkRRect::kLowerRight_Corner].fY = random->nextRangeF(kRadiusMin, 9.f); 468 469 r[SkRRect::kUpperRight_Corner].fX = r[SkRRect::kLowerRight_Corner].fX; 470 r[SkRRect::kUpperRight_Corner].fY = r[SkRRect::kUpperLeft_Corner].fY; 471 472 r[SkRRect::kLowerLeft_Corner].fX = r[SkRRect::kUpperLeft_Corner].fX; 473 r[SkRRect::kLowerLeft_Corner].fY = r[SkRRect::kLowerRight_Corner].fY; 474 475 rrect.setRectRadii(SkRect::MakeWH(w, h), r); 476 } else { 477 rrect.setRectXY(SkRect::MakeWH(w, h), r[SkRRect::kUpperLeft_Corner].fX, 478 r[SkRRect::kUpperLeft_Corner].fY); 479 } 480 GrFragmentProcessor* fp; 481 do { 482 GrPrimitiveEdgeType et = (GrPrimitiveEdgeType)random->nextULessThan(kGrProcessorEdgeTypeCnt); 483 fp = GrRRectEffect::Create(et, rrect); 484 } while (NULL == fp); 485 return fp; 486 } 487 488 ////////////////////////////////////////////////////////////////////////////// 489 490 class GLEllipticalRRectEffect : public GrGLFragmentProcessor { 491 public: 492 GLEllipticalRRectEffect(const GrBackendProcessorFactory&, const GrProcessor&); 493 494 virtual void emitCode(GrGLProgramBuilder* builder, 495 const GrFragmentProcessor& effect, 496 const GrProcessorKey& key, 497 const char* outputColor, 498 const char* inputColor, 499 const TransformedCoordsArray&, 500 const TextureSamplerArray&) SK_OVERRIDE; 501 502 static inline void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKeyBuilder*); 503 504 virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE; 505 506 private: 507 GrGLProgramDataManager::UniformHandle fInnerRectUniform; 508 GrGLProgramDataManager::UniformHandle fInvRadiiSqdUniform; 509 SkRRect fPrevRRect; 510 typedef GrGLFragmentProcessor INHERITED; 511 }; 512 513 GLEllipticalRRectEffect::GLEllipticalRRectEffect(const GrBackendProcessorFactory& factory, 514 const GrProcessor& effect) 515 : INHERITED (factory) { 516 fPrevRRect.setEmpty(); 517 } 518 519 void GLEllipticalRRectEffect::emitCode(GrGLProgramBuilder* builder, 520 const GrFragmentProcessor& effect, 521 const GrProcessorKey& key, 522 const char* outputColor, 523 const char* inputColor, 524 const TransformedCoordsArray&, 525 const TextureSamplerArray& samplers) { 526 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); 527 const char *rectName; 528 // The inner rect is the rrect bounds inset by the x/y radii 529 fInnerRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 530 kVec4f_GrSLType, 531 "innerRect", 532 &rectName); 533 534 GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder(); 535 const char* fragmentPos = fsBuilder->fragmentPosition(); 536 // At each quarter-ellipse corner we compute a vector that is the offset of the fragment pos 537 // to the ellipse center. The vector is pinned in x and y to be in the quarter-plane relevant 538 // to that corner. This means that points near the interior near the rrect top edge will have 539 // a vector that points straight up for both the TL left and TR corners. Computing an 540 // alpha from this vector at either the TR or TL corner will give the correct result. Similarly, 541 // fragments near the other three edges will get the correct AA. Fragments in the interior of 542 // the rrect will have a (0,0) vector at all four corners. So long as the radii > 0.5 they will 543 // correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas. 544 // The code below is a simplified version of the above that performs maxs on the vector 545 // components before computing distances and alpha values so that only one distance computation 546 // need be computed to determine the min alpha. 547 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos); 548 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName); 549 switch (erre.getRRect().getType()) { 550 case SkRRect::kSimple_Type: { 551 const char *invRadiiXYSqdName; 552 fInvRadiiSqdUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 553 kVec2f_GrSLType, 554 "invRadiiXY", 555 &invRadiiXYSqdName); 556 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n"); 557 // Z is the x/y offsets divided by squared radii. 558 fsBuilder->codeAppendf("\t\tvec2 Z = dxy * %s;\n", invRadiiXYSqdName); 559 break; 560 } 561 case SkRRect::kNinePatch_Type: { 562 const char *invRadiiLTRBSqdName; 563 fInvRadiiSqdUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 564 kVec4f_GrSLType, 565 "invRadiiLTRB", 566 &invRadiiLTRBSqdName); 567 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n"); 568 // Z is the x/y offsets divided by squared radii. We only care about the (at most) one 569 // corner where both the x and y offsets are positive, hence the maxes. (The inverse 570 // squared radii will always be positive.) 571 fsBuilder->codeAppendf("\t\tvec2 Z = max(max(dxy0 * %s.xy, dxy1 * %s.zw), 0.0);\n", 572 invRadiiLTRBSqdName, invRadiiLTRBSqdName); 573 break; 574 } 575 default: 576 SkFAIL("RRect should always be simple or nine-patch."); 577 } 578 // implicit is the evaluation of (x/a)^2 + (y/b)^2 - 1. 579 fsBuilder->codeAppend("\t\tfloat implicit = dot(Z, dxy) - 1.0;\n"); 580 // grad_dot is the squared length of the gradient of the implicit. 581 fsBuilder->codeAppendf("\t\tfloat grad_dot = 4.0 * dot(Z, Z);\n"); 582 // avoid calling inversesqrt on zero. 583 fsBuilder->codeAppend("\t\tgrad_dot = max(grad_dot, 1.0e-4);\n"); 584 fsBuilder->codeAppendf("\t\tfloat approx_dist = implicit * inversesqrt(grad_dot);\n"); 585 586 if (kFillAA_GrProcessorEdgeType == erre.getEdgeType()) { 587 fsBuilder->codeAppend("\t\tfloat alpha = clamp(0.5 - approx_dist, 0.0, 1.0);\n"); 588 } else { 589 fsBuilder->codeAppend("\t\tfloat alpha = clamp(0.5 + approx_dist, 0.0, 1.0);\n"); 590 } 591 592 fsBuilder->codeAppendf("\t\t%s = %s;\n", outputColor, 593 (GrGLSLExpr4(inputColor) * GrGLSLExpr1("alpha")).c_str()); 594 } 595 596 void GLEllipticalRRectEffect::GenKey(const GrProcessor& effect, const GrGLCaps&, 597 GrProcessorKeyBuilder* b) { 598 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); 599 GR_STATIC_ASSERT(kLast_GrProcessorEdgeType < (1 << 3)); 600 b->add32(erre.getRRect().getType() | erre.getEdgeType() << 3); 601 } 602 603 void GLEllipticalRRectEffect::setData(const GrGLProgramDataManager& pdman, 604 const GrProcessor& effect) { 605 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); 606 const SkRRect& rrect = erre.getRRect(); 607 if (rrect != fPrevRRect) { 608 SkRect rect = rrect.getBounds(); 609 const SkVector& r0 = rrect.radii(SkRRect::kUpperLeft_Corner); 610 SkASSERT(r0.fX >= kRadiusMin); 611 SkASSERT(r0.fY >= kRadiusMin); 612 switch (erre.getRRect().getType()) { 613 case SkRRect::kSimple_Type: 614 rect.inset(r0.fX, r0.fY); 615 pdman.set2f(fInvRadiiSqdUniform, 1.f / (r0.fX * r0.fX), 616 1.f / (r0.fY * r0.fY)); 617 break; 618 case SkRRect::kNinePatch_Type: { 619 const SkVector& r1 = rrect.radii(SkRRect::kLowerRight_Corner); 620 SkASSERT(r1.fX >= kRadiusMin); 621 SkASSERT(r1.fY >= kRadiusMin); 622 rect.fLeft += r0.fX; 623 rect.fTop += r0.fY; 624 rect.fRight -= r1.fX; 625 rect.fBottom -= r1.fY; 626 pdman.set4f(fInvRadiiSqdUniform, 1.f / (r0.fX * r0.fX), 627 1.f / (r0.fY * r0.fY), 628 1.f / (r1.fX * r1.fX), 629 1.f / (r1.fY * r1.fY)); 630 break; 631 } 632 default: 633 SkFAIL("RRect should always be simple or nine-patch."); 634 } 635 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom); 636 fPrevRRect = rrect; 637 } 638 } 639 640 ////////////////////////////////////////////////////////////////////////////// 641 642 GrFragmentProcessor* GrRRectEffect::Create(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) { 643 if (rrect.isRect()) { 644 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 645 } 646 647 if (rrect.isOval()) { 648 return GrOvalEffect::Create(edgeType, rrect.getBounds()); 649 } 650 651 if (rrect.isSimple()) { 652 if (rrect.getSimpleRadii().fX < kRadiusMin || rrect.getSimpleRadii().fY < kRadiusMin) { 653 // In this case the corners are extremely close to rectangular and we collapse the 654 // clip to a rectangular clip. 655 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 656 } 657 if (rrect.getSimpleRadii().fX == rrect.getSimpleRadii().fY) { 658 return CircularRRectEffect::Create(edgeType, CircularRRectEffect::kAll_CornerFlags, 659 rrect); 660 } else { 661 return EllipticalRRectEffect::Create(edgeType, rrect); 662 } 663 } 664 665 if (rrect.isComplex() || rrect.isNinePatch()) { 666 // Check for the "tab" cases - two adjacent circular corners and two square corners. 667 SkScalar circularRadius = 0; 668 uint32_t cornerFlags = 0; 669 670 SkVector radii[4]; 671 bool squashedRadii = false; 672 for (int c = 0; c < 4; ++c) { 673 radii[c] = rrect.radii((SkRRect::Corner)c); 674 SkASSERT((0 == radii[c].fX) == (0 == radii[c].fY)); 675 if (0 == radii[c].fX) { 676 // The corner is square, so no need to squash or flag as circular. 677 continue; 678 } 679 if (radii[c].fX < kRadiusMin || radii[c].fY < kRadiusMin) { 680 radii[c].set(0, 0); 681 squashedRadii = true; 682 continue; 683 } 684 if (radii[c].fX != radii[c].fY) { 685 cornerFlags = ~0U; 686 break; 687 } 688 if (!cornerFlags) { 689 circularRadius = radii[c].fX; 690 cornerFlags = 1 << c; 691 } else { 692 if (radii[c].fX != circularRadius) { 693 cornerFlags = ~0U; 694 break; 695 } 696 cornerFlags |= 1 << c; 697 } 698 } 699 700 switch (cornerFlags) { 701 case CircularRRectEffect::kAll_CornerFlags: 702 // This rrect should have been caught in the simple case above. Though, it would 703 // be correctly handled in the fallthrough code. 704 SkASSERT(false); 705 case CircularRRectEffect::kTopLeft_CornerFlag: 706 case CircularRRectEffect::kTopRight_CornerFlag: 707 case CircularRRectEffect::kBottomRight_CornerFlag: 708 case CircularRRectEffect::kBottomLeft_CornerFlag: 709 case CircularRRectEffect::kLeft_CornerFlags: 710 case CircularRRectEffect::kTop_CornerFlags: 711 case CircularRRectEffect::kRight_CornerFlags: 712 case CircularRRectEffect::kBottom_CornerFlags: { 713 SkTCopyOnFirstWrite<SkRRect> rr(rrect); 714 if (squashedRadii) { 715 rr.writable()->setRectRadii(rrect.getBounds(), radii); 716 } 717 return CircularRRectEffect::Create(edgeType, cornerFlags, *rr); 718 } 719 case CircularRRectEffect::kNone_CornerFlags: 720 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 721 default: { 722 if (squashedRadii) { 723 // If we got here then we squashed some but not all the radii to zero. (If all 724 // had been squashed cornerFlags would be 0.) The elliptical effect doesn't 725 // support some rounded and some square corners. 726 return NULL; 727 } 728 if (rrect.isNinePatch()) { 729 return EllipticalRRectEffect::Create(edgeType, rrect); 730 } 731 return NULL; 732 } 733 } 734 } 735 736 return NULL; 737 } 738
