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 "GrRRectEffect.h" 9 10 #include "GrConvexPolyEffect.h" 11 #include "GrFragmentProcessor.h" 12 #include "GrInvariantOutput.h" 13 #include "GrOvalEffect.h" 14 #include "SkRRect.h" 15 #include "gl/GrGLProcessor.h" 16 #include "gl/GrGLSL.h" 17 #include "gl/builders/GrGLProgramBuilder.h" 18 19 // The effects defined here only handle rrect radii >= kRadiusMin. 20 static const SkScalar kRadiusMin = SK_ScalarHalf; 21 22 ////////////////////////////////////////////////////////////////////////////// 23 24 class CircularRRectEffect : public GrFragmentProcessor { 25 public: 26 27 enum CornerFlags { 28 kTopLeft_CornerFlag = (1 << SkRRect::kUpperLeft_Corner), 29 kTopRight_CornerFlag = (1 << SkRRect::kUpperRight_Corner), 30 kBottomRight_CornerFlag = (1 << SkRRect::kLowerRight_Corner), 31 kBottomLeft_CornerFlag = (1 << SkRRect::kLowerLeft_Corner), 32 33 kLeft_CornerFlags = kTopLeft_CornerFlag | kBottomLeft_CornerFlag, 34 kTop_CornerFlags = kTopLeft_CornerFlag | kTopRight_CornerFlag, 35 kRight_CornerFlags = kTopRight_CornerFlag | kBottomRight_CornerFlag, 36 kBottom_CornerFlags = kBottomLeft_CornerFlag | kBottomRight_CornerFlag, 37 38 kAll_CornerFlags = kTopLeft_CornerFlag | kTopRight_CornerFlag | 39 kBottomLeft_CornerFlag | kBottomRight_CornerFlag, 40 41 kNone_CornerFlags = 0 42 }; 43 44 // The flags are used to indicate which corners are circluar (unflagged corners are assumed to 45 // be square). 46 static GrFragmentProcessor* Create(GrPrimitiveEdgeType, uint32_t circularCornerFlags, 47 const SkRRect&); 48 49 virtual ~CircularRRectEffect() {}; 50 51 const char* name() const override { return "CircularRRect"; } 52 53 void getGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; 54 55 GrGLFragmentProcessor* createGLInstance() const override; 56 57 const SkRRect& getRRect() const { return fRRect; } 58 59 uint32_t getCircularCornerFlags() const { return fCircularCornerFlags; } 60 61 GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } 62 63 private: 64 CircularRRectEffect(GrPrimitiveEdgeType, uint32_t circularCornerFlags, const SkRRect&); 65 66 bool onIsEqual(const GrFragmentProcessor& other) const override; 67 68 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; 69 70 SkRRect fRRect; 71 GrPrimitiveEdgeType fEdgeType; 72 uint32_t fCircularCornerFlags; 73 74 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 75 76 typedef GrFragmentProcessor INHERITED; 77 }; 78 79 GrFragmentProcessor* CircularRRectEffect::Create(GrPrimitiveEdgeType edgeType, 80 uint32_t circularCornerFlags, 81 const SkRRect& rrect) { 82 if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) { 83 return NULL; 84 } 85 return SkNEW_ARGS(CircularRRectEffect, (edgeType, circularCornerFlags, rrect)); 86 } 87 88 void CircularRRectEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { 89 inout->mulByUnknownSingleComponent(); 90 } 91 92 CircularRRectEffect::CircularRRectEffect(GrPrimitiveEdgeType edgeType, uint32_t circularCornerFlags, 93 const SkRRect& rrect) 94 : fRRect(rrect) 95 , fEdgeType(edgeType) 96 , fCircularCornerFlags(circularCornerFlags) { 97 this->initClassID<CircularRRectEffect>(); 98 this->setWillReadFragmentPosition(); 99 } 100 101 bool CircularRRectEffect::onIsEqual(const GrFragmentProcessor& other) const { 102 const CircularRRectEffect& crre = other.cast<CircularRRectEffect>(); 103 // The corner flags are derived from fRRect, so no need to check them. 104 return fEdgeType == crre.fEdgeType && fRRect == crre.fRRect; 105 } 106 107 ////////////////////////////////////////////////////////////////////////////// 108 109 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(CircularRRectEffect); 110 111 GrFragmentProcessor* CircularRRectEffect::TestCreate(SkRandom* random, 112 GrContext*, 113 const GrDrawTargetCaps& caps, 114 GrTexture*[]) { 115 SkScalar w = random->nextRangeScalar(20.f, 1000.f); 116 SkScalar h = random->nextRangeScalar(20.f, 1000.f); 117 SkScalar r = random->nextRangeF(kRadiusMin, 9.f); 118 SkRRect rrect; 119 rrect.setRectXY(SkRect::MakeWH(w, h), r, r); 120 GrFragmentProcessor* fp; 121 do { 122 GrPrimitiveEdgeType et = 123 (GrPrimitiveEdgeType)random->nextULessThan(kGrProcessorEdgeTypeCnt); 124 fp = GrRRectEffect::Create(et, rrect); 125 } while (NULL == fp); 126 return fp; 127 } 128 129 ////////////////////////////////////////////////////////////////////////////// 130 131 class GLCircularRRectEffect : public GrGLFragmentProcessor { 132 public: 133 GLCircularRRectEffect(const GrProcessor&); 134 135 virtual void emitCode(GrGLFPBuilder* builder, 136 const GrFragmentProcessor& fp, 137 const char* outputColor, 138 const char* inputColor, 139 const TransformedCoordsArray&, 140 const TextureSamplerArray&) override; 141 142 static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*); 143 144 void setData(const GrGLProgramDataManager&, const GrProcessor&) override; 145 146 private: 147 GrGLProgramDataManager::UniformHandle fInnerRectUniform; 148 GrGLProgramDataManager::UniformHandle fRadiusPlusHalfUniform; 149 SkRRect fPrevRRect; 150 typedef GrGLFragmentProcessor INHERITED; 151 }; 152 153 GLCircularRRectEffect::GLCircularRRectEffect(const GrProcessor& ) { 154 fPrevRRect.setEmpty(); 155 } 156 157 void GLCircularRRectEffect::emitCode(GrGLFPBuilder* builder, 158 const GrFragmentProcessor& fp, 159 const char* outputColor, 160 const char* inputColor, 161 const TransformedCoordsArray&, 162 const TextureSamplerArray& samplers) { 163 const CircularRRectEffect& crre = fp.cast<CircularRRectEffect>(); 164 const char *rectName; 165 const char *radiusPlusHalfName; 166 // The inner rect is the rrect bounds inset by the radius. Its left, top, right, and bottom 167 // edges correspond to components x, y, z, and w, respectively. When a side of the rrect has 168 // only rectangular corners, that side's value corresponds to the rect edge's value outset by 169 // half a pixel. 170 fInnerRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 171 kVec4f_GrSLType, kDefault_GrSLPrecision, 172 "innerRect", 173 &rectName); 174 fRadiusPlusHalfUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 175 kFloat_GrSLType, kDefault_GrSLPrecision, 176 "radiusPlusHalf", 177 &radiusPlusHalfName); 178 179 GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); 180 const char* fragmentPos = fsBuilder->fragmentPosition(); 181 // At each quarter-circle corner we compute a vector that is the offset of the fragment position 182 // from the circle center. The vector is pinned in x and y to be in the quarter-plane relevant 183 // to that corner. This means that points near the interior near the rrect top edge will have 184 // a vector that points straight up for both the TL left and TR corners. Computing an 185 // alpha from this vector at either the TR or TL corner will give the correct result. Similarly, 186 // fragments near the other three edges will get the correct AA. Fragments in the interior of 187 // the rrect will have a (0,0) vector at all four corners. So long as the radius > 0.5 they will 188 // correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas. 189 // The code below is a simplified version of the above that performs maxs on the vector 190 // components before computing distances and alpha values so that only one distance computation 191 // need be computed to determine the min alpha. 192 // 193 // For the cases where one half of the rrect is rectangular we drop one of the x or y 194 // computations, compute a separate rect edge alpha for the rect side, and mul the two computed 195 // alphas together. 196 switch (crre.getCircularCornerFlags()) { 197 case CircularRRectEffect::kAll_CornerFlags: 198 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos); 199 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName); 200 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n"); 201 fsBuilder->codeAppendf("\t\tfloat alpha = clamp(%s - length(dxy), 0.0, 1.0);\n", 202 radiusPlusHalfName); 203 break; 204 case CircularRRectEffect::kTopLeft_CornerFlag: 205 fsBuilder->codeAppendf("\t\tvec2 dxy = max(%s.xy - %s.xy, 0.0);\n", 206 rectName, fragmentPos); 207 fsBuilder->codeAppendf("\t\tfloat rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);\n", 208 rectName, fragmentPos); 209 fsBuilder->codeAppendf("\t\tfloat bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);\n", 210 rectName, fragmentPos); 211 fsBuilder->codeAppendf("\t\tfloat alpha = bottomAlpha * rightAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 212 radiusPlusHalfName); 213 break; 214 case CircularRRectEffect::kTopRight_CornerFlag: 215 fsBuilder->codeAppendf("\t\tvec2 dxy = max(vec2(%s.x - %s.z, %s.y - %s.y), 0.0);\n", 216 fragmentPos, rectName, rectName, fragmentPos); 217 fsBuilder->codeAppendf("\t\tfloat leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);\n", 218 fragmentPos, rectName); 219 fsBuilder->codeAppendf("\t\tfloat bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);\n", 220 rectName, fragmentPos); 221 fsBuilder->codeAppendf("\t\tfloat alpha = bottomAlpha * leftAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 222 radiusPlusHalfName); 223 break; 224 case CircularRRectEffect::kBottomRight_CornerFlag: 225 fsBuilder->codeAppendf("\t\tvec2 dxy = max(%s.xy - %s.zw, 0.0);\n", 226 fragmentPos, rectName); 227 fsBuilder->codeAppendf("\t\tfloat leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);\n", 228 fragmentPos, rectName); 229 fsBuilder->codeAppendf("\t\tfloat topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);\n", 230 fragmentPos, rectName); 231 fsBuilder->codeAppendf("\t\tfloat alpha = topAlpha * leftAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 232 radiusPlusHalfName); 233 break; 234 case CircularRRectEffect::kBottomLeft_CornerFlag: 235 fsBuilder->codeAppendf("\t\tvec2 dxy = max(vec2(%s.x - %s.x, %s.y - %s.w), 0.0);\n", 236 rectName, fragmentPos, fragmentPos, rectName); 237 fsBuilder->codeAppendf("\t\tfloat rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);\n", 238 rectName, fragmentPos); 239 fsBuilder->codeAppendf("\t\tfloat topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);\n", 240 fragmentPos, rectName); 241 fsBuilder->codeAppendf("\t\tfloat alpha = topAlpha * rightAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 242 radiusPlusHalfName); 243 break; 244 case CircularRRectEffect::kLeft_CornerFlags: 245 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos); 246 fsBuilder->codeAppendf("\t\tfloat dy1 = %s.y - %s.w;\n", fragmentPos, rectName); 247 fsBuilder->codeAppend("\t\tvec2 dxy = max(vec2(dxy0.x, max(dxy0.y, dy1)), 0.0);\n"); 248 fsBuilder->codeAppendf("\t\tfloat rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);\n", 249 rectName, fragmentPos); 250 fsBuilder->codeAppendf("\t\tfloat alpha = rightAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 251 radiusPlusHalfName); 252 break; 253 case CircularRRectEffect::kTop_CornerFlags: 254 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos); 255 fsBuilder->codeAppendf("\t\tfloat dx1 = %s.x - %s.z;\n", fragmentPos, rectName); 256 fsBuilder->codeAppend("\t\tvec2 dxy = max(vec2(max(dxy0.x, dx1), dxy0.y), 0.0);\n"); 257 fsBuilder->codeAppendf("\t\tfloat bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);\n", 258 rectName, fragmentPos); 259 fsBuilder->codeAppendf("\t\tfloat alpha = bottomAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 260 radiusPlusHalfName); 261 break; 262 case CircularRRectEffect::kRight_CornerFlags: 263 fsBuilder->codeAppendf("\t\tfloat dy0 = %s.y - %s.y;\n", rectName, fragmentPos); 264 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName); 265 fsBuilder->codeAppend("\t\tvec2 dxy = max(vec2(dxy1.x, max(dy0, dxy1.y)), 0.0);\n"); 266 fsBuilder->codeAppendf("\t\tfloat leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);\n", 267 fragmentPos, rectName); 268 fsBuilder->codeAppendf("\t\tfloat alpha = leftAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 269 radiusPlusHalfName); 270 break; 271 case CircularRRectEffect::kBottom_CornerFlags: 272 fsBuilder->codeAppendf("\t\tfloat dx0 = %s.x - %s.x;\n", rectName, fragmentPos); 273 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName); 274 fsBuilder->codeAppend("\t\tvec2 dxy = max(vec2(max(dx0, dxy1.x), dxy1.y), 0.0);\n"); 275 fsBuilder->codeAppendf("\t\tfloat topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);\n", 276 fragmentPos, rectName); 277 fsBuilder->codeAppendf("\t\tfloat alpha = topAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n", 278 radiusPlusHalfName); 279 break; 280 } 281 282 if (kInverseFillAA_GrProcessorEdgeType == crre.getEdgeType()) { 283 fsBuilder->codeAppend("\t\talpha = 1.0 - alpha;\n"); 284 } 285 286 fsBuilder->codeAppendf("\t\t%s = %s;\n", outputColor, 287 (GrGLSLExpr4(inputColor) * GrGLSLExpr1("alpha")).c_str()); 288 } 289 290 void GLCircularRRectEffect::GenKey(const GrProcessor& processor, const GrGLSLCaps&, 291 GrProcessorKeyBuilder* b) { 292 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>(); 293 GR_STATIC_ASSERT(kGrProcessorEdgeTypeCnt <= 8); 294 b->add32((crre.getCircularCornerFlags() << 3) | crre.getEdgeType()); 295 } 296 297 void GLCircularRRectEffect::setData(const GrGLProgramDataManager& pdman, 298 const GrProcessor& processor) { 299 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>(); 300 const SkRRect& rrect = crre.getRRect(); 301 if (rrect != fPrevRRect) { 302 SkRect rect = rrect.getBounds(); 303 SkScalar radius = 0; 304 switch (crre.getCircularCornerFlags()) { 305 case CircularRRectEffect::kAll_CornerFlags: 306 SkASSERT(rrect.isSimpleCircular()); 307 radius = rrect.getSimpleRadii().fX; 308 SkASSERT(radius >= kRadiusMin); 309 rect.inset(radius, radius); 310 break; 311 case CircularRRectEffect::kTopLeft_CornerFlag: 312 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 313 rect.fLeft += radius; 314 rect.fTop += radius; 315 rect.fRight += 0.5f; 316 rect.fBottom += 0.5f; 317 break; 318 case CircularRRectEffect::kTopRight_CornerFlag: 319 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX; 320 rect.fLeft -= 0.5f; 321 rect.fTop += radius; 322 rect.fRight -= radius; 323 rect.fBottom += 0.5f; 324 break; 325 case CircularRRectEffect::kBottomRight_CornerFlag: 326 radius = rrect.radii(SkRRect::kLowerRight_Corner).fX; 327 rect.fLeft -= 0.5f; 328 rect.fTop -= 0.5f; 329 rect.fRight -= radius; 330 rect.fBottom -= radius; 331 break; 332 case CircularRRectEffect::kBottomLeft_CornerFlag: 333 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX; 334 rect.fLeft += radius; 335 rect.fTop -= 0.5f; 336 rect.fRight += 0.5f; 337 rect.fBottom -= radius; 338 break; 339 case CircularRRectEffect::kLeft_CornerFlags: 340 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 341 rect.fLeft += radius; 342 rect.fTop += radius; 343 rect.fRight += 0.5f; 344 rect.fBottom -= radius; 345 break; 346 case CircularRRectEffect::kTop_CornerFlags: 347 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 348 rect.fLeft += radius; 349 rect.fTop += radius; 350 rect.fRight -= radius; 351 rect.fBottom += 0.5f; 352 break; 353 case CircularRRectEffect::kRight_CornerFlags: 354 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX; 355 rect.fLeft -= 0.5f; 356 rect.fTop += radius; 357 rect.fRight -= radius; 358 rect.fBottom -= radius; 359 break; 360 case CircularRRectEffect::kBottom_CornerFlags: 361 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX; 362 rect.fLeft += radius; 363 rect.fTop -= 0.5f; 364 rect.fRight -= radius; 365 rect.fBottom -= radius; 366 break; 367 default: 368 SkFAIL("Should have been one of the above cases."); 369 } 370 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom); 371 pdman.set1f(fRadiusPlusHalfUniform, radius + 0.5f); 372 fPrevRRect = rrect; 373 } 374 } 375 376 //////////////////////////////////////////////////////////////////////////////////////////////////// 377 378 void CircularRRectEffect::getGLProcessorKey(const GrGLSLCaps& caps, 379 GrProcessorKeyBuilder* b) const { 380 GLCircularRRectEffect::GenKey(*this, caps, b); 381 } 382 383 GrGLFragmentProcessor* CircularRRectEffect::createGLInstance() const { 384 return SkNEW_ARGS(GLCircularRRectEffect, (*this)); 385 } 386 387 ////////////////////////////////////////////////////////////////////////////// 388 389 class EllipticalRRectEffect : public GrFragmentProcessor { 390 public: 391 static GrFragmentProcessor* Create(GrPrimitiveEdgeType, const SkRRect&); 392 393 virtual ~EllipticalRRectEffect() {}; 394 395 const char* name() const override { return "EllipticalRRect"; } 396 397 void getGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; 398 399 GrGLFragmentProcessor* createGLInstance() const override; 400 401 const SkRRect& getRRect() const { return fRRect; } 402 403 GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } 404 405 private: 406 EllipticalRRectEffect(GrPrimitiveEdgeType, const SkRRect&); 407 408 bool onIsEqual(const GrFragmentProcessor& other) const override; 409 410 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; 411 412 SkRRect fRRect; 413 GrPrimitiveEdgeType fEdgeType; 414 415 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 416 417 typedef GrFragmentProcessor INHERITED; 418 }; 419 420 GrFragmentProcessor* 421 EllipticalRRectEffect::Create(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) { 422 if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) { 423 return NULL; 424 } 425 return SkNEW_ARGS(EllipticalRRectEffect, (edgeType, rrect)); 426 } 427 428 void EllipticalRRectEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { 429 inout->mulByUnknownSingleComponent(); 430 } 431 432 EllipticalRRectEffect::EllipticalRRectEffect(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) 433 : fRRect(rrect) 434 , fEdgeType(edgeType) { 435 this->initClassID<EllipticalRRectEffect>(); 436 this->setWillReadFragmentPosition(); 437 } 438 439 bool EllipticalRRectEffect::onIsEqual(const GrFragmentProcessor& other) const { 440 const EllipticalRRectEffect& erre = other.cast<EllipticalRRectEffect>(); 441 return fEdgeType == erre.fEdgeType && fRRect == erre.fRRect; 442 } 443 444 ////////////////////////////////////////////////////////////////////////////// 445 446 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(EllipticalRRectEffect); 447 448 GrFragmentProcessor* EllipticalRRectEffect::TestCreate(SkRandom* random, 449 GrContext*, 450 const GrDrawTargetCaps& caps, 451 GrTexture*[]) { 452 SkScalar w = random->nextRangeScalar(20.f, 1000.f); 453 SkScalar h = random->nextRangeScalar(20.f, 1000.f); 454 SkVector r[4]; 455 r[SkRRect::kUpperLeft_Corner].fX = random->nextRangeF(kRadiusMin, 9.f); 456 // ensure at least one corner really is elliptical 457 do { 458 r[SkRRect::kUpperLeft_Corner].fY = random->nextRangeF(kRadiusMin, 9.f); 459 } while (r[SkRRect::kUpperLeft_Corner].fY == r[SkRRect::kUpperLeft_Corner].fX); 460 461 SkRRect rrect; 462 if (random->nextBool()) { 463 // half the time create a four-radii rrect. 464 r[SkRRect::kLowerRight_Corner].fX = random->nextRangeF(kRadiusMin, 9.f); 465 r[SkRRect::kLowerRight_Corner].fY = random->nextRangeF(kRadiusMin, 9.f); 466 467 r[SkRRect::kUpperRight_Corner].fX = r[SkRRect::kLowerRight_Corner].fX; 468 r[SkRRect::kUpperRight_Corner].fY = r[SkRRect::kUpperLeft_Corner].fY; 469 470 r[SkRRect::kLowerLeft_Corner].fX = r[SkRRect::kUpperLeft_Corner].fX; 471 r[SkRRect::kLowerLeft_Corner].fY = r[SkRRect::kLowerRight_Corner].fY; 472 473 rrect.setRectRadii(SkRect::MakeWH(w, h), r); 474 } else { 475 rrect.setRectXY(SkRect::MakeWH(w, h), r[SkRRect::kUpperLeft_Corner].fX, 476 r[SkRRect::kUpperLeft_Corner].fY); 477 } 478 GrFragmentProcessor* fp; 479 do { 480 GrPrimitiveEdgeType et = (GrPrimitiveEdgeType)random->nextULessThan(kGrProcessorEdgeTypeCnt); 481 fp = GrRRectEffect::Create(et, rrect); 482 } while (NULL == fp); 483 return fp; 484 } 485 486 ////////////////////////////////////////////////////////////////////////////// 487 488 class GLEllipticalRRectEffect : public GrGLFragmentProcessor { 489 public: 490 GLEllipticalRRectEffect(const GrProcessor&); 491 492 virtual void emitCode(GrGLFPBuilder* builder, 493 const GrFragmentProcessor& effect, 494 const char* outputColor, 495 const char* inputColor, 496 const TransformedCoordsArray&, 497 const TextureSamplerArray&) override; 498 499 static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*); 500 501 void setData(const GrGLProgramDataManager&, const GrProcessor&) override; 502 503 private: 504 GrGLProgramDataManager::UniformHandle fInnerRectUniform; 505 GrGLProgramDataManager::UniformHandle fInvRadiiSqdUniform; 506 SkRRect fPrevRRect; 507 typedef GrGLFragmentProcessor INHERITED; 508 }; 509 510 GLEllipticalRRectEffect::GLEllipticalRRectEffect(const GrProcessor& effect) { 511 fPrevRRect.setEmpty(); 512 } 513 514 void GLEllipticalRRectEffect::emitCode(GrGLFPBuilder* builder, 515 const GrFragmentProcessor& effect, 516 const char* outputColor, 517 const char* inputColor, 518 const TransformedCoordsArray&, 519 const TextureSamplerArray& samplers) { 520 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); 521 const char *rectName; 522 // The inner rect is the rrect bounds inset by the x/y radii 523 fInnerRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 524 kVec4f_GrSLType, kDefault_GrSLPrecision, 525 "innerRect", 526 &rectName); 527 528 GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); 529 const char* fragmentPos = fsBuilder->fragmentPosition(); 530 // At each quarter-ellipse corner we compute a vector that is the offset of the fragment pos 531 // to the ellipse center. The vector is pinned in x and y to be in the quarter-plane relevant 532 // to that corner. This means that points near the interior near the rrect top edge will have 533 // a vector that points straight up for both the TL left and TR corners. Computing an 534 // alpha from this vector at either the TR or TL corner will give the correct result. Similarly, 535 // fragments near the other three edges will get the correct AA. Fragments in the interior of 536 // the rrect will have a (0,0) vector at all four corners. So long as the radii > 0.5 they will 537 // correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas. 538 // The code below is a simplified version of the above that performs maxs on the vector 539 // components before computing distances and alpha values so that only one distance computation 540 // need be computed to determine the min alpha. 541 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos); 542 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName); 543 switch (erre.getRRect().getType()) { 544 case SkRRect::kSimple_Type: { 545 const char *invRadiiXYSqdName; 546 fInvRadiiSqdUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 547 kVec2f_GrSLType, kDefault_GrSLPrecision, 548 "invRadiiXY", 549 &invRadiiXYSqdName); 550 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n"); 551 // Z is the x/y offsets divided by squared radii. 552 fsBuilder->codeAppendf("\t\tvec2 Z = dxy * %s;\n", invRadiiXYSqdName); 553 break; 554 } 555 case SkRRect::kNinePatch_Type: { 556 const char *invRadiiLTRBSqdName; 557 fInvRadiiSqdUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility, 558 kVec4f_GrSLType, kDefault_GrSLPrecision, 559 "invRadiiLTRB", 560 &invRadiiLTRBSqdName); 561 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n"); 562 // Z is the x/y offsets divided by squared radii. We only care about the (at most) one 563 // corner where both the x and y offsets are positive, hence the maxes. (The inverse 564 // squared radii will always be positive.) 565 fsBuilder->codeAppendf("\t\tvec2 Z = max(max(dxy0 * %s.xy, dxy1 * %s.zw), 0.0);\n", 566 invRadiiLTRBSqdName, invRadiiLTRBSqdName); 567 break; 568 } 569 default: 570 SkFAIL("RRect should always be simple or nine-patch."); 571 } 572 // implicit is the evaluation of (x/a)^2 + (y/b)^2 - 1. 573 fsBuilder->codeAppend("\t\tfloat implicit = dot(Z, dxy) - 1.0;\n"); 574 // grad_dot is the squared length of the gradient of the implicit. 575 fsBuilder->codeAppendf("\t\tfloat grad_dot = 4.0 * dot(Z, Z);\n"); 576 // avoid calling inversesqrt on zero. 577 fsBuilder->codeAppend("\t\tgrad_dot = max(grad_dot, 1.0e-4);\n"); 578 fsBuilder->codeAppendf("\t\tfloat approx_dist = implicit * inversesqrt(grad_dot);\n"); 579 580 if (kFillAA_GrProcessorEdgeType == erre.getEdgeType()) { 581 fsBuilder->codeAppend("\t\tfloat alpha = clamp(0.5 - approx_dist, 0.0, 1.0);\n"); 582 } else { 583 fsBuilder->codeAppend("\t\tfloat alpha = clamp(0.5 + approx_dist, 0.0, 1.0);\n"); 584 } 585 586 fsBuilder->codeAppendf("\t\t%s = %s;\n", outputColor, 587 (GrGLSLExpr4(inputColor) * GrGLSLExpr1("alpha")).c_str()); 588 } 589 590 void GLEllipticalRRectEffect::GenKey(const GrProcessor& effect, const GrGLSLCaps&, 591 GrProcessorKeyBuilder* b) { 592 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); 593 GR_STATIC_ASSERT(kLast_GrProcessorEdgeType < (1 << 3)); 594 b->add32(erre.getRRect().getType() | erre.getEdgeType() << 3); 595 } 596 597 void GLEllipticalRRectEffect::setData(const GrGLProgramDataManager& pdman, 598 const GrProcessor& effect) { 599 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); 600 const SkRRect& rrect = erre.getRRect(); 601 if (rrect != fPrevRRect) { 602 SkRect rect = rrect.getBounds(); 603 const SkVector& r0 = rrect.radii(SkRRect::kUpperLeft_Corner); 604 SkASSERT(r0.fX >= kRadiusMin); 605 SkASSERT(r0.fY >= kRadiusMin); 606 switch (erre.getRRect().getType()) { 607 case SkRRect::kSimple_Type: 608 rect.inset(r0.fX, r0.fY); 609 pdman.set2f(fInvRadiiSqdUniform, 1.f / (r0.fX * r0.fX), 610 1.f / (r0.fY * r0.fY)); 611 break; 612 case SkRRect::kNinePatch_Type: { 613 const SkVector& r1 = rrect.radii(SkRRect::kLowerRight_Corner); 614 SkASSERT(r1.fX >= kRadiusMin); 615 SkASSERT(r1.fY >= kRadiusMin); 616 rect.fLeft += r0.fX; 617 rect.fTop += r0.fY; 618 rect.fRight -= r1.fX; 619 rect.fBottom -= r1.fY; 620 pdman.set4f(fInvRadiiSqdUniform, 1.f / (r0.fX * r0.fX), 621 1.f / (r0.fY * r0.fY), 622 1.f / (r1.fX * r1.fX), 623 1.f / (r1.fY * r1.fY)); 624 break; 625 } 626 default: 627 SkFAIL("RRect should always be simple or nine-patch."); 628 } 629 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom); 630 fPrevRRect = rrect; 631 } 632 } 633 634 //////////////////////////////////////////////////////////////////////////////////////////////////// 635 636 void EllipticalRRectEffect::getGLProcessorKey(const GrGLSLCaps& caps, 637 GrProcessorKeyBuilder* b) const { 638 GLEllipticalRRectEffect::GenKey(*this, caps, b); 639 } 640 641 GrGLFragmentProcessor* EllipticalRRectEffect::createGLInstance() const { 642 return SkNEW_ARGS(GLEllipticalRRectEffect, (*this)); 643 } 644 645 ////////////////////////////////////////////////////////////////////////////// 646 647 GrFragmentProcessor* GrRRectEffect::Create(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) { 648 if (rrect.isRect()) { 649 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 650 } 651 652 if (rrect.isOval()) { 653 return GrOvalEffect::Create(edgeType, rrect.getBounds()); 654 } 655 656 if (rrect.isSimple()) { 657 if (rrect.getSimpleRadii().fX < kRadiusMin || rrect.getSimpleRadii().fY < kRadiusMin) { 658 // In this case the corners are extremely close to rectangular and we collapse the 659 // clip to a rectangular clip. 660 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 661 } 662 if (rrect.getSimpleRadii().fX == rrect.getSimpleRadii().fY) { 663 return CircularRRectEffect::Create(edgeType, CircularRRectEffect::kAll_CornerFlags, 664 rrect); 665 } else { 666 return EllipticalRRectEffect::Create(edgeType, rrect); 667 } 668 } 669 670 if (rrect.isComplex() || rrect.isNinePatch()) { 671 // Check for the "tab" cases - two adjacent circular corners and two square corners. 672 SkScalar circularRadius = 0; 673 uint32_t cornerFlags = 0; 674 675 SkVector radii[4]; 676 bool squashedRadii = false; 677 for (int c = 0; c < 4; ++c) { 678 radii[c] = rrect.radii((SkRRect::Corner)c); 679 SkASSERT((0 == radii[c].fX) == (0 == radii[c].fY)); 680 if (0 == radii[c].fX) { 681 // The corner is square, so no need to squash or flag as circular. 682 continue; 683 } 684 if (radii[c].fX < kRadiusMin || radii[c].fY < kRadiusMin) { 685 radii[c].set(0, 0); 686 squashedRadii = true; 687 continue; 688 } 689 if (radii[c].fX != radii[c].fY) { 690 cornerFlags = ~0U; 691 break; 692 } 693 if (!cornerFlags) { 694 circularRadius = radii[c].fX; 695 cornerFlags = 1 << c; 696 } else { 697 if (radii[c].fX != circularRadius) { 698 cornerFlags = ~0U; 699 break; 700 } 701 cornerFlags |= 1 << c; 702 } 703 } 704 705 switch (cornerFlags) { 706 case CircularRRectEffect::kAll_CornerFlags: 707 // This rrect should have been caught in the simple case above. Though, it would 708 // be correctly handled in the fallthrough code. 709 SkASSERT(false); 710 case CircularRRectEffect::kTopLeft_CornerFlag: 711 case CircularRRectEffect::kTopRight_CornerFlag: 712 case CircularRRectEffect::kBottomRight_CornerFlag: 713 case CircularRRectEffect::kBottomLeft_CornerFlag: 714 case CircularRRectEffect::kLeft_CornerFlags: 715 case CircularRRectEffect::kTop_CornerFlags: 716 case CircularRRectEffect::kRight_CornerFlags: 717 case CircularRRectEffect::kBottom_CornerFlags: { 718 SkTCopyOnFirstWrite<SkRRect> rr(rrect); 719 if (squashedRadii) { 720 rr.writable()->setRectRadii(rrect.getBounds(), radii); 721 } 722 return CircularRRectEffect::Create(edgeType, cornerFlags, *rr); 723 } 724 case CircularRRectEffect::kNone_CornerFlags: 725 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 726 default: { 727 if (squashedRadii) { 728 // If we got here then we squashed some but not all the radii to zero. (If all 729 // had been squashed cornerFlags would be 0.) The elliptical effect doesn't 730 // support some rounded and some square corners. 731 return NULL; 732 } 733 if (rrect.isNinePatch()) { 734 return EllipticalRRectEffect::Create(edgeType, rrect); 735 } 736 return NULL; 737 } 738 } 739 } 740 741 return NULL; 742 } 743
