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 "SkTLazy.h" 16 #include "glsl/GrGLSLFragmentProcessor.h" 17 #include "glsl/GrGLSLFragmentShaderBuilder.h" 18 #include "glsl/GrGLSLProgramDataManager.h" 19 #include "glsl/GrGLSLUniformHandler.h" 20 21 // The effects defined here only handle rrect radii >= kRadiusMin. 22 static const SkScalar kRadiusMin = SK_ScalarHalf; 23 24 ////////////////////////////////////////////////////////////////////////////// 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 53 const char* name() const override { return "CircularRRect"; } 54 55 const SkRRect& getRRect() const { return fRRect; } 56 57 uint32_t getCircularCornerFlags() const { return fCircularCornerFlags; } 58 59 GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } 60 61 private: 62 CircularRRectEffect(GrPrimitiveEdgeType, uint32_t circularCornerFlags, const SkRRect&); 63 64 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 65 66 void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; 67 68 bool onIsEqual(const GrFragmentProcessor& other) const override; 69 70 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; 71 72 SkRRect fRRect; 73 GrPrimitiveEdgeType fEdgeType; 74 uint32_t fCircularCornerFlags; 75 76 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 77 78 typedef GrFragmentProcessor INHERITED; 79 }; 80 81 GrFragmentProcessor* CircularRRectEffect::Create(GrPrimitiveEdgeType edgeType, 82 uint32_t circularCornerFlags, 83 const SkRRect& rrect) { 84 if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) { 85 return nullptr; 86 } 87 return new CircularRRectEffect(edgeType, circularCornerFlags, rrect); 88 } 89 90 void CircularRRectEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { 91 inout->mulByUnknownSingleComponent(); 92 } 93 94 CircularRRectEffect::CircularRRectEffect(GrPrimitiveEdgeType edgeType, uint32_t circularCornerFlags, 95 const SkRRect& rrect) 96 : fRRect(rrect) 97 , fEdgeType(edgeType) 98 , fCircularCornerFlags(circularCornerFlags) { 99 this->initClassID<CircularRRectEffect>(); 100 this->setWillReadFragmentPosition(); 101 } 102 103 bool CircularRRectEffect::onIsEqual(const GrFragmentProcessor& other) const { 104 const CircularRRectEffect& crre = other.cast<CircularRRectEffect>(); 105 // The corner flags are derived from fRRect, so no need to check them. 106 return fEdgeType == crre.fEdgeType && fRRect == crre.fRRect; 107 } 108 109 ////////////////////////////////////////////////////////////////////////////// 110 111 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(CircularRRectEffect); 112 113 const GrFragmentProcessor* CircularRRectEffect::TestCreate(GrProcessorTestData* d) { 114 SkScalar w = d->fRandom->nextRangeScalar(20.f, 1000.f); 115 SkScalar h = d->fRandom->nextRangeScalar(20.f, 1000.f); 116 SkScalar r = d->fRandom->nextRangeF(kRadiusMin, 9.f); 117 SkRRect rrect; 118 rrect.setRectXY(SkRect::MakeWH(w, h), r, r); 119 GrFragmentProcessor* fp; 120 do { 121 GrPrimitiveEdgeType et = 122 (GrPrimitiveEdgeType)d->fRandom->nextULessThan(kGrProcessorEdgeTypeCnt); 123 fp = GrRRectEffect::Create(et, rrect); 124 } while (nullptr == fp); 125 return fp; 126 } 127 128 ////////////////////////////////////////////////////////////////////////////// 129 130 class GLCircularRRectEffect : public GrGLSLFragmentProcessor { 131 public: 132 GLCircularRRectEffect() { 133 fPrevRRect.setEmpty(); 134 } 135 136 virtual void emitCode(EmitArgs&) override; 137 138 static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*); 139 140 protected: 141 void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override; 142 143 private: 144 GrGLSLProgramDataManager::UniformHandle fInnerRectUniform; 145 GrGLSLProgramDataManager::UniformHandle fRadiusPlusHalfUniform; 146 SkRRect fPrevRRect; 147 typedef GrGLSLFragmentProcessor INHERITED; 148 }; 149 150 void GLCircularRRectEffect::emitCode(EmitArgs& args) { 151 const CircularRRectEffect& crre = args.fFp.cast<CircularRRectEffect>(); 152 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; 153 const char *rectName; 154 const char *radiusPlusHalfName; 155 // The inner rect is the rrect bounds inset by the radius. Its left, top, right, and bottom 156 // edges correspond to components x, y, z, and w, respectively. When a side of the rrect has 157 // only rectangular corners, that side's value corresponds to the rect edge's value outset by 158 // half a pixel. 159 fInnerRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 160 kVec4f_GrSLType, kDefault_GrSLPrecision, 161 "innerRect", 162 &rectName); 163 // x is (r + .5) and y is 1/(r + .5) 164 fRadiusPlusHalfUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 165 kVec2f_GrSLType, kDefault_GrSLPrecision, 166 "radiusPlusHalf", 167 &radiusPlusHalfName); 168 169 // If we're on a device with a "real" mediump then the length calculation could overflow. 170 SkString clampedCircleDistance; 171 if (args.fGLSLCaps->floatPrecisionVaries()) { 172 clampedCircleDistance.printf("clamp(%s.x * (1.0 - length(dxy * %s.y)), 0.0, 1.0);", 173 radiusPlusHalfName, radiusPlusHalfName); 174 } else { 175 clampedCircleDistance.printf("clamp(%s.x - length(dxy), 0.0, 1.0);", radiusPlusHalfName); 176 } 177 178 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; 179 const char* fragmentPos = fragBuilder->fragmentPosition(); 180 // At each quarter-circle corner we compute a vector that is the offset of the fragment position 181 // from the circle center. The vector is pinned in x and y to be in the quarter-plane relevant 182 // to that corner. This means that points near the interior near the rrect top edge will have 183 // a vector that points straight up for both the TL left and TR corners. Computing an 184 // alpha from this vector at either the TR or TL corner will give the correct result. Similarly, 185 // fragments near the other three edges will get the correct AA. Fragments in the interior of 186 // the rrect will have a (0,0) vector at all four corners. So long as the radius > 0.5 they will 187 // correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas. 188 // The code below is a simplified version of the above that performs maxs on the vector 189 // components before computing distances and alpha values so that only one distance computation 190 // need be computed to determine the min alpha. 191 // 192 // For the cases where one half of the rrect is rectangular we drop one of the x or y 193 // computations, compute a separate rect edge alpha for the rect side, and mul the two computed 194 // alphas together. 195 switch (crre.getCircularCornerFlags()) { 196 case CircularRRectEffect::kAll_CornerFlags: 197 fragBuilder->codeAppendf("vec2 dxy0 = %s.xy - %s.xy;", rectName, fragmentPos); 198 fragBuilder->codeAppendf("vec2 dxy1 = %s.xy - %s.zw;", fragmentPos, rectName); 199 fragBuilder->codeAppend("vec2 dxy = max(max(dxy0, dxy1), 0.0);"); 200 fragBuilder->codeAppendf("float alpha = %s;", clampedCircleDistance.c_str()); 201 break; 202 case CircularRRectEffect::kTopLeft_CornerFlag: 203 fragBuilder->codeAppendf("vec2 dxy = max(%s.xy - %s.xy, 0.0);", 204 rectName, fragmentPos); 205 fragBuilder->codeAppendf("float rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);", 206 rectName, fragmentPos); 207 fragBuilder->codeAppendf("float bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);", 208 rectName, fragmentPos); 209 fragBuilder->codeAppendf("float alpha = bottomAlpha * rightAlpha * %s;", 210 clampedCircleDistance.c_str()); 211 break; 212 case CircularRRectEffect::kTopRight_CornerFlag: 213 fragBuilder->codeAppendf("vec2 dxy = max(vec2(%s.x - %s.z, %s.y - %s.y), 0.0);", 214 fragmentPos, rectName, rectName, fragmentPos); 215 fragBuilder->codeAppendf("float leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);", 216 fragmentPos, rectName); 217 fragBuilder->codeAppendf("float bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);", 218 rectName, fragmentPos); 219 fragBuilder->codeAppendf("float alpha = bottomAlpha * leftAlpha * %s;", 220 clampedCircleDistance.c_str()); 221 break; 222 case CircularRRectEffect::kBottomRight_CornerFlag: 223 fragBuilder->codeAppendf("vec2 dxy = max(%s.xy - %s.zw, 0.0);", 224 fragmentPos, rectName); 225 fragBuilder->codeAppendf("float leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);", 226 fragmentPos, rectName); 227 fragBuilder->codeAppendf("float topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);", 228 fragmentPos, rectName); 229 fragBuilder->codeAppendf("float alpha = topAlpha * leftAlpha * %s;", 230 clampedCircleDistance.c_str()); 231 break; 232 case CircularRRectEffect::kBottomLeft_CornerFlag: 233 fragBuilder->codeAppendf("vec2 dxy = max(vec2(%s.x - %s.x, %s.y - %s.w), 0.0);", 234 rectName, fragmentPos, fragmentPos, rectName); 235 fragBuilder->codeAppendf("float rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);", 236 rectName, fragmentPos); 237 fragBuilder->codeAppendf("float topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);", 238 fragmentPos, rectName); 239 fragBuilder->codeAppendf("float alpha = topAlpha * rightAlpha * %s;", 240 clampedCircleDistance.c_str()); 241 break; 242 case CircularRRectEffect::kLeft_CornerFlags: 243 fragBuilder->codeAppendf("vec2 dxy0 = %s.xy - %s.xy;", rectName, fragmentPos); 244 fragBuilder->codeAppendf("float dy1 = %s.y - %s.w;", fragmentPos, rectName); 245 fragBuilder->codeAppend("vec2 dxy = max(vec2(dxy0.x, max(dxy0.y, dy1)), 0.0);"); 246 fragBuilder->codeAppendf("float rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);", 247 rectName, fragmentPos); 248 fragBuilder->codeAppendf("float alpha = rightAlpha * %s;", 249 clampedCircleDistance.c_str()); 250 break; 251 case CircularRRectEffect::kTop_CornerFlags: 252 fragBuilder->codeAppendf("vec2 dxy0 = %s.xy - %s.xy;", rectName, fragmentPos); 253 fragBuilder->codeAppendf("float dx1 = %s.x - %s.z;", fragmentPos, rectName); 254 fragBuilder->codeAppend("vec2 dxy = max(vec2(max(dxy0.x, dx1), dxy0.y), 0.0);"); 255 fragBuilder->codeAppendf("float bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);", 256 rectName, fragmentPos); 257 fragBuilder->codeAppendf("float alpha = bottomAlpha * %s;", 258 clampedCircleDistance.c_str()); 259 break; 260 case CircularRRectEffect::kRight_CornerFlags: 261 fragBuilder->codeAppendf("float dy0 = %s.y - %s.y;", rectName, fragmentPos); 262 fragBuilder->codeAppendf("vec2 dxy1 = %s.xy - %s.zw;", fragmentPos, rectName); 263 fragBuilder->codeAppend("vec2 dxy = max(vec2(dxy1.x, max(dy0, dxy1.y)), 0.0);"); 264 fragBuilder->codeAppendf("float leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);", 265 fragmentPos, rectName); 266 fragBuilder->codeAppendf("float alpha = leftAlpha * %s;", 267 clampedCircleDistance.c_str()); 268 break; 269 case CircularRRectEffect::kBottom_CornerFlags: 270 fragBuilder->codeAppendf("float dx0 = %s.x - %s.x;", rectName, fragmentPos); 271 fragBuilder->codeAppendf("vec2 dxy1 = %s.xy - %s.zw;", fragmentPos, rectName); 272 fragBuilder->codeAppend("vec2 dxy = max(vec2(max(dx0, dxy1.x), dxy1.y), 0.0);"); 273 fragBuilder->codeAppendf("float topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);", 274 fragmentPos, rectName); 275 fragBuilder->codeAppendf("float alpha = topAlpha * %s;", 276 clampedCircleDistance.c_str()); 277 break; 278 } 279 280 if (kInverseFillAA_GrProcessorEdgeType == crre.getEdgeType()) { 281 fragBuilder->codeAppend("alpha = 1.0 - alpha;"); 282 } 283 284 fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, 285 (GrGLSLExpr4(args.fInputColor) * GrGLSLExpr1("alpha")).c_str()); 286 } 287 288 void GLCircularRRectEffect::GenKey(const GrProcessor& processor, const GrGLSLCaps&, 289 GrProcessorKeyBuilder* b) { 290 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>(); 291 GR_STATIC_ASSERT(kGrProcessorEdgeTypeCnt <= 8); 292 b->add32((crre.getCircularCornerFlags() << 3) | crre.getEdgeType()); 293 } 294 295 void GLCircularRRectEffect::onSetData(const GrGLSLProgramDataManager& pdman, 296 const GrProcessor& processor) { 297 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>(); 298 const SkRRect& rrect = crre.getRRect(); 299 if (rrect != fPrevRRect) { 300 SkRect rect = rrect.getBounds(); 301 SkScalar radius = 0; 302 switch (crre.getCircularCornerFlags()) { 303 case CircularRRectEffect::kAll_CornerFlags: 304 SkASSERT(rrect.isSimpleCircular()); 305 radius = rrect.getSimpleRadii().fX; 306 SkASSERT(radius >= kRadiusMin); 307 rect.inset(radius, radius); 308 break; 309 case CircularRRectEffect::kTopLeft_CornerFlag: 310 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 311 rect.fLeft += radius; 312 rect.fTop += radius; 313 rect.fRight += 0.5f; 314 rect.fBottom += 0.5f; 315 break; 316 case CircularRRectEffect::kTopRight_CornerFlag: 317 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX; 318 rect.fLeft -= 0.5f; 319 rect.fTop += radius; 320 rect.fRight -= radius; 321 rect.fBottom += 0.5f; 322 break; 323 case CircularRRectEffect::kBottomRight_CornerFlag: 324 radius = rrect.radii(SkRRect::kLowerRight_Corner).fX; 325 rect.fLeft -= 0.5f; 326 rect.fTop -= 0.5f; 327 rect.fRight -= radius; 328 rect.fBottom -= radius; 329 break; 330 case CircularRRectEffect::kBottomLeft_CornerFlag: 331 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX; 332 rect.fLeft += radius; 333 rect.fTop -= 0.5f; 334 rect.fRight += 0.5f; 335 rect.fBottom -= radius; 336 break; 337 case CircularRRectEffect::kLeft_CornerFlags: 338 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 339 rect.fLeft += radius; 340 rect.fTop += radius; 341 rect.fRight += 0.5f; 342 rect.fBottom -= radius; 343 break; 344 case CircularRRectEffect::kTop_CornerFlags: 345 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 346 rect.fLeft += radius; 347 rect.fTop += radius; 348 rect.fRight -= radius; 349 rect.fBottom += 0.5f; 350 break; 351 case CircularRRectEffect::kRight_CornerFlags: 352 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX; 353 rect.fLeft -= 0.5f; 354 rect.fTop += radius; 355 rect.fRight -= radius; 356 rect.fBottom -= radius; 357 break; 358 case CircularRRectEffect::kBottom_CornerFlags: 359 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX; 360 rect.fLeft += radius; 361 rect.fTop -= 0.5f; 362 rect.fRight -= radius; 363 rect.fBottom -= radius; 364 break; 365 default: 366 SkFAIL("Should have been one of the above cases."); 367 } 368 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom); 369 radius += 0.5f; 370 pdman.set2f(fRadiusPlusHalfUniform, radius, 1.f / radius); 371 fPrevRRect = rrect; 372 } 373 } 374 375 //////////////////////////////////////////////////////////////////////////////////////////////////// 376 377 void CircularRRectEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps, 378 GrProcessorKeyBuilder* b) const { 379 GLCircularRRectEffect::GenKey(*this, caps, b); 380 } 381 382 GrGLSLFragmentProcessor* CircularRRectEffect::onCreateGLSLInstance() const { 383 return new GLCircularRRectEffect; 384 } 385 386 ////////////////////////////////////////////////////////////////////////////// 387 388 class EllipticalRRectEffect : public GrFragmentProcessor { 389 public: 390 static GrFragmentProcessor* Create(GrPrimitiveEdgeType, const SkRRect&); 391 392 virtual ~EllipticalRRectEffect() {}; 393 394 const char* name() const override { return "EllipticalRRect"; } 395 396 const SkRRect& getRRect() const { return fRRect; } 397 398 GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } 399 400 private: 401 EllipticalRRectEffect(GrPrimitiveEdgeType, const SkRRect&); 402 403 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 404 405 void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; 406 407 bool onIsEqual(const GrFragmentProcessor& other) const override; 408 409 void onComputeInvariantOutput(GrInvariantOutput* inout) const 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 nullptr; 423 } 424 return new EllipticalRRectEffect(edgeType, rrect); 425 } 426 427 void EllipticalRRectEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { 428 inout->mulByUnknownSingleComponent(); 429 } 430 431 EllipticalRRectEffect::EllipticalRRectEffect(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) 432 : fRRect(rrect) 433 , fEdgeType(edgeType) { 434 this->initClassID<EllipticalRRectEffect>(); 435 this->setWillReadFragmentPosition(); 436 } 437 438 bool EllipticalRRectEffect::onIsEqual(const GrFragmentProcessor& other) const { 439 const EllipticalRRectEffect& erre = other.cast<EllipticalRRectEffect>(); 440 return fEdgeType == erre.fEdgeType && fRRect == erre.fRRect; 441 } 442 443 ////////////////////////////////////////////////////////////////////////////// 444 445 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(EllipticalRRectEffect); 446 447 const GrFragmentProcessor* EllipticalRRectEffect::TestCreate(GrProcessorTestData* d) { 448 SkScalar w = d->fRandom->nextRangeScalar(20.f, 1000.f); 449 SkScalar h = d->fRandom->nextRangeScalar(20.f, 1000.f); 450 SkVector r[4]; 451 r[SkRRect::kUpperLeft_Corner].fX = d->fRandom->nextRangeF(kRadiusMin, 9.f); 452 // ensure at least one corner really is elliptical 453 do { 454 r[SkRRect::kUpperLeft_Corner].fY = d->fRandom->nextRangeF(kRadiusMin, 9.f); 455 } while (r[SkRRect::kUpperLeft_Corner].fY == r[SkRRect::kUpperLeft_Corner].fX); 456 457 SkRRect rrect; 458 if (d->fRandom->nextBool()) { 459 // half the time create a four-radii rrect. 460 r[SkRRect::kLowerRight_Corner].fX = d->fRandom->nextRangeF(kRadiusMin, 9.f); 461 r[SkRRect::kLowerRight_Corner].fY = d->fRandom->nextRangeF(kRadiusMin, 9.f); 462 463 r[SkRRect::kUpperRight_Corner].fX = r[SkRRect::kLowerRight_Corner].fX; 464 r[SkRRect::kUpperRight_Corner].fY = r[SkRRect::kUpperLeft_Corner].fY; 465 466 r[SkRRect::kLowerLeft_Corner].fX = r[SkRRect::kUpperLeft_Corner].fX; 467 r[SkRRect::kLowerLeft_Corner].fY = r[SkRRect::kLowerRight_Corner].fY; 468 469 rrect.setRectRadii(SkRect::MakeWH(w, h), r); 470 } else { 471 rrect.setRectXY(SkRect::MakeWH(w, h), r[SkRRect::kUpperLeft_Corner].fX, 472 r[SkRRect::kUpperLeft_Corner].fY); 473 } 474 GrFragmentProcessor* fp; 475 do { 476 GrPrimitiveEdgeType et = 477 (GrPrimitiveEdgeType)d->fRandom->nextULessThan(kGrProcessorEdgeTypeCnt); 478 fp = GrRRectEffect::Create(et, rrect); 479 } while (nullptr == fp); 480 return fp; 481 } 482 483 ////////////////////////////////////////////////////////////////////////////// 484 485 class GLEllipticalRRectEffect : public GrGLSLFragmentProcessor { 486 public: 487 GLEllipticalRRectEffect() { 488 fPrevRRect.setEmpty(); 489 } 490 491 void emitCode(EmitArgs&) override; 492 493 static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*); 494 495 protected: 496 void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override; 497 498 private: 499 GrGLSLProgramDataManager::UniformHandle fInnerRectUniform; 500 GrGLSLProgramDataManager::UniformHandle fInvRadiiSqdUniform; 501 GrGLSLProgramDataManager::UniformHandle fScaleUniform; 502 SkRRect fPrevRRect; 503 typedef GrGLSLFragmentProcessor INHERITED; 504 }; 505 506 void GLEllipticalRRectEffect::emitCode(EmitArgs& args) { 507 const EllipticalRRectEffect& erre = args.fFp.cast<EllipticalRRectEffect>(); 508 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; 509 const char *rectName; 510 // The inner rect is the rrect bounds inset by the x/y radii 511 fInnerRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 512 kVec4f_GrSLType, kDefault_GrSLPrecision, 513 "innerRect", 514 &rectName); 515 516 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; 517 const char* fragmentPos = fragBuilder->fragmentPosition(); 518 // At each quarter-ellipse corner we compute a vector that is the offset of the fragment pos 519 // to the ellipse center. The vector is pinned in x and y to be in the quarter-plane relevant 520 // to that corner. This means that points near the interior near the rrect top edge will have 521 // a vector that points straight up for both the TL left and TR corners. Computing an 522 // alpha from this vector at either the TR or TL corner will give the correct result. Similarly, 523 // fragments near the other three edges will get the correct AA. Fragments in the interior of 524 // the rrect will have a (0,0) vector at all four corners. So long as the radii > 0.5 they will 525 // correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas. 526 // 527 // The code below is a simplified version of the above that performs maxs on the vector 528 // components before computing distances and alpha values so that only one distance computation 529 // need be computed to determine the min alpha. 530 fragBuilder->codeAppendf("vec2 dxy0 = %s.xy - %s.xy;", rectName, fragmentPos); 531 fragBuilder->codeAppendf("vec2 dxy1 = %s.xy - %s.zw;", fragmentPos, rectName); 532 533 // If we're on a device with a "real" mediump then we'll do the distance computation in a space 534 // that is normalized by the largest radius. The scale uniform will be scale, 1/scale. The 535 // radii uniform values are already in this normalized space. 536 const char* scaleName = nullptr; 537 if (args.fGLSLCaps->floatPrecisionVaries()) { 538 fScaleUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 539 kVec2f_GrSLType, kDefault_GrSLPrecision, 540 "scale", &scaleName); 541 } 542 543 // The uniforms with the inv squared radii are highp to prevent underflow. 544 switch (erre.getRRect().getType()) { 545 case SkRRect::kSimple_Type: { 546 const char *invRadiiXYSqdName; 547 fInvRadiiSqdUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 548 kVec2f_GrSLType, 549 kDefault_GrSLPrecision, 550 "invRadiiXY", 551 &invRadiiXYSqdName); 552 fragBuilder->codeAppend("vec2 dxy = max(max(dxy0, dxy1), 0.0);"); 553 if (scaleName) { 554 fragBuilder->codeAppendf("dxy *= %s.y;", scaleName); 555 } 556 // Z is the x/y offsets divided by squared radii. 557 fragBuilder->codeAppendf("vec2 Z = dxy * %s.xy;", invRadiiXYSqdName); 558 break; 559 } 560 case SkRRect::kNinePatch_Type: { 561 const char *invRadiiLTRBSqdName; 562 fInvRadiiSqdUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 563 kVec4f_GrSLType, 564 kDefault_GrSLPrecision, 565 "invRadiiLTRB", 566 &invRadiiLTRBSqdName); 567 if (scaleName) { 568 fragBuilder->codeAppendf("dxy0 *= %s.y;", scaleName); 569 fragBuilder->codeAppendf("dxy1 *= %s.y;", scaleName); 570 } 571 fragBuilder->codeAppend("vec2 dxy = max(max(dxy0, dxy1), 0.0);"); 572 // Z is the x/y offsets divided by squared radii. We only care about the (at most) one 573 // corner where both the x and y offsets are positive, hence the maxes. (The inverse 574 // squared radii will always be positive.) 575 fragBuilder->codeAppendf("vec2 Z = max(max(dxy0 * %s.xy, dxy1 * %s.zw), 0.0);", 576 invRadiiLTRBSqdName, invRadiiLTRBSqdName); 577 578 break; 579 } 580 default: 581 SkFAIL("RRect should always be simple or nine-patch."); 582 } 583 // implicit is the evaluation of (x/a)^2 + (y/b)^2 - 1. 584 fragBuilder->codeAppend("float implicit = dot(Z, dxy) - 1.0;"); 585 // grad_dot is the squared length of the gradient of the implicit. 586 fragBuilder->codeAppend("float grad_dot = 4.0 * dot(Z, Z);"); 587 // avoid calling inversesqrt on zero. 588 fragBuilder->codeAppend("grad_dot = max(grad_dot, 1.0e-4);"); 589 fragBuilder->codeAppend("float approx_dist = implicit * inversesqrt(grad_dot);"); 590 if (scaleName) { 591 fragBuilder->codeAppendf("approx_dist *= %s.x;", scaleName); 592 } 593 594 if (kFillAA_GrProcessorEdgeType == erre.getEdgeType()) { 595 fragBuilder->codeAppend("float alpha = clamp(0.5 - approx_dist, 0.0, 1.0);"); 596 } else { 597 fragBuilder->codeAppend("float alpha = clamp(0.5 + approx_dist, 0.0, 1.0);"); 598 } 599 600 fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, 601 (GrGLSLExpr4(args.fInputColor) * GrGLSLExpr1("alpha")).c_str()); 602 } 603 604 void GLEllipticalRRectEffect::GenKey(const GrProcessor& effect, const GrGLSLCaps&, 605 GrProcessorKeyBuilder* b) { 606 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); 607 GR_STATIC_ASSERT(kLast_GrProcessorEdgeType < (1 << 3)); 608 b->add32(erre.getRRect().getType() | erre.getEdgeType() << 3); 609 } 610 611 void GLEllipticalRRectEffect::onSetData(const GrGLSLProgramDataManager& pdman, 612 const GrProcessor& effect) { 613 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); 614 const SkRRect& rrect = erre.getRRect(); 615 // If we're using a scale factor to work around precision issues, choose the largest radius 616 // as the scale factor. The inv radii need to be pre-adjusted by the scale factor. 617 if (rrect != fPrevRRect) { 618 SkRect rect = rrect.getBounds(); 619 const SkVector& r0 = rrect.radii(SkRRect::kUpperLeft_Corner); 620 SkASSERT(r0.fX >= kRadiusMin); 621 SkASSERT(r0.fY >= kRadiusMin); 622 switch (erre.getRRect().getType()) { 623 case SkRRect::kSimple_Type: 624 rect.inset(r0.fX, r0.fY); 625 if (fScaleUniform.isValid()) { 626 if (r0.fX > r0.fY) { 627 pdman.set2f(fInvRadiiSqdUniform, 1.f, (r0.fX * r0.fX) / (r0.fY * r0.fY)); 628 pdman.set2f(fScaleUniform, r0.fX, 1.f / r0.fX); 629 } else { 630 pdman.set2f(fInvRadiiSqdUniform, (r0.fY * r0.fY) / (r0.fX * r0.fX), 1.f); 631 pdman.set2f(fScaleUniform, r0.fY, 1.f / r0.fY); 632 } 633 } else { 634 pdman.set2f(fInvRadiiSqdUniform, 1.f / (r0.fX * r0.fX), 635 1.f / (r0.fY * r0.fY)); 636 } 637 break; 638 case SkRRect::kNinePatch_Type: { 639 const SkVector& r1 = rrect.radii(SkRRect::kLowerRight_Corner); 640 SkASSERT(r1.fX >= kRadiusMin); 641 SkASSERT(r1.fY >= kRadiusMin); 642 rect.fLeft += r0.fX; 643 rect.fTop += r0.fY; 644 rect.fRight -= r1.fX; 645 rect.fBottom -= r1.fY; 646 if (fScaleUniform.isValid()) { 647 float scale = SkTMax(SkTMax(r0.fX, r0.fY), SkTMax(r1.fX, r1.fY)); 648 float scaleSqd = scale * scale; 649 pdman.set4f(fInvRadiiSqdUniform, scaleSqd / (r0.fX * r0.fX), 650 scaleSqd / (r0.fY * r0.fY), 651 scaleSqd / (r1.fX * r1.fX), 652 scaleSqd / (r1.fY * r1.fY)); 653 pdman.set2f(fScaleUniform, scale, 1.f / scale); 654 } else { 655 pdman.set4f(fInvRadiiSqdUniform, 1.f / (r0.fX * r0.fX), 656 1.f / (r0.fY * r0.fY), 657 1.f / (r1.fX * r1.fX), 658 1.f / (r1.fY * r1.fY)); 659 } 660 break; 661 } 662 default: 663 SkFAIL("RRect should always be simple or nine-patch."); 664 } 665 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom); 666 fPrevRRect = rrect; 667 } 668 } 669 670 //////////////////////////////////////////////////////////////////////////////////////////////////// 671 672 void EllipticalRRectEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps, 673 GrProcessorKeyBuilder* b) const { 674 GLEllipticalRRectEffect::GenKey(*this, caps, b); 675 } 676 677 GrGLSLFragmentProcessor* EllipticalRRectEffect::onCreateGLSLInstance() const { 678 return new GLEllipticalRRectEffect; 679 } 680 681 ////////////////////////////////////////////////////////////////////////////// 682 683 GrFragmentProcessor* GrRRectEffect::Create(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) { 684 if (rrect.isRect()) { 685 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 686 } 687 688 if (rrect.isOval()) { 689 return GrOvalEffect::Create(edgeType, rrect.getBounds()); 690 } 691 692 if (rrect.isSimple()) { 693 if (rrect.getSimpleRadii().fX < kRadiusMin || rrect.getSimpleRadii().fY < kRadiusMin) { 694 // In this case the corners are extremely close to rectangular and we collapse the 695 // clip to a rectangular clip. 696 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 697 } 698 if (rrect.getSimpleRadii().fX == rrect.getSimpleRadii().fY) { 699 return CircularRRectEffect::Create(edgeType, CircularRRectEffect::kAll_CornerFlags, 700 rrect); 701 } else { 702 return EllipticalRRectEffect::Create(edgeType, rrect); 703 } 704 } 705 706 if (rrect.isComplex() || rrect.isNinePatch()) { 707 // Check for the "tab" cases - two adjacent circular corners and two square corners. 708 SkScalar circularRadius = 0; 709 uint32_t cornerFlags = 0; 710 711 SkVector radii[4]; 712 bool squashedRadii = false; 713 for (int c = 0; c < 4; ++c) { 714 radii[c] = rrect.radii((SkRRect::Corner)c); 715 SkASSERT((0 == radii[c].fX) == (0 == radii[c].fY)); 716 if (0 == radii[c].fX) { 717 // The corner is square, so no need to squash or flag as circular. 718 continue; 719 } 720 if (radii[c].fX < kRadiusMin || radii[c].fY < kRadiusMin) { 721 radii[c].set(0, 0); 722 squashedRadii = true; 723 continue; 724 } 725 if (radii[c].fX != radii[c].fY) { 726 cornerFlags = ~0U; 727 break; 728 } 729 if (!cornerFlags) { 730 circularRadius = radii[c].fX; 731 cornerFlags = 1 << c; 732 } else { 733 if (radii[c].fX != circularRadius) { 734 cornerFlags = ~0U; 735 break; 736 } 737 cornerFlags |= 1 << c; 738 } 739 } 740 741 switch (cornerFlags) { 742 case CircularRRectEffect::kAll_CornerFlags: 743 // This rrect should have been caught in the simple case above. Though, it would 744 // be correctly handled in the fallthrough code. 745 SkASSERT(false); 746 case CircularRRectEffect::kTopLeft_CornerFlag: 747 case CircularRRectEffect::kTopRight_CornerFlag: 748 case CircularRRectEffect::kBottomRight_CornerFlag: 749 case CircularRRectEffect::kBottomLeft_CornerFlag: 750 case CircularRRectEffect::kLeft_CornerFlags: 751 case CircularRRectEffect::kTop_CornerFlags: 752 case CircularRRectEffect::kRight_CornerFlags: 753 case CircularRRectEffect::kBottom_CornerFlags: { 754 SkTCopyOnFirstWrite<SkRRect> rr(rrect); 755 if (squashedRadii) { 756 rr.writable()->setRectRadii(rrect.getBounds(), radii); 757 } 758 return CircularRRectEffect::Create(edgeType, cornerFlags, *rr); 759 } 760 case CircularRRectEffect::kNone_CornerFlags: 761 return GrConvexPolyEffect::Create(edgeType, rrect.getBounds()); 762 default: { 763 if (squashedRadii) { 764 // If we got here then we squashed some but not all the radii to zero. (If all 765 // had been squashed cornerFlags would be 0.) The elliptical effect doesn't 766 // support some rounded and some square corners. 767 return nullptr; 768 } 769 if (rrect.isNinePatch()) { 770 return EllipticalRRectEffect::Create(edgeType, rrect); 771 } 772 return nullptr; 773 } 774 } 775 } 776 777 return nullptr; 778 } 779
