GrRRectEffect.cpp revision 587e08f361ee3e775a6bbc6dca761dbba82e422c
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 "GrShaderCaps.h" 15#include "SkRRect.h" 16#include "SkTLazy.h" 17#include "glsl/GrGLSLFragmentProcessor.h" 18#include "glsl/GrGLSLFragmentShaderBuilder.h" 19#include "glsl/GrGLSLProgramDataManager.h" 20#include "glsl/GrGLSLUniformHandler.h" 21 22// The effects defined here only handle rrect radii >= kRadiusMin. 23static const SkScalar kRadiusMin = SK_ScalarHalf; 24 25////////////////////////////////////////////////////////////////////////////// 26 27class CircularRRectEffect : public GrFragmentProcessor { 28public: 29 30 enum CornerFlags { 31 kTopLeft_CornerFlag = (1 << SkRRect::kUpperLeft_Corner), 32 kTopRight_CornerFlag = (1 << SkRRect::kUpperRight_Corner), 33 kBottomRight_CornerFlag = (1 << SkRRect::kLowerRight_Corner), 34 kBottomLeft_CornerFlag = (1 << SkRRect::kLowerLeft_Corner), 35 36 kLeft_CornerFlags = kTopLeft_CornerFlag | kBottomLeft_CornerFlag, 37 kTop_CornerFlags = kTopLeft_CornerFlag | kTopRight_CornerFlag, 38 kRight_CornerFlags = kTopRight_CornerFlag | kBottomRight_CornerFlag, 39 kBottom_CornerFlags = kBottomLeft_CornerFlag | kBottomRight_CornerFlag, 40 41 kAll_CornerFlags = kTopLeft_CornerFlag | kTopRight_CornerFlag | 42 kBottomLeft_CornerFlag | kBottomRight_CornerFlag, 43 44 kNone_CornerFlags = 0 45 }; 46 47 // The flags are used to indicate which corners are circluar (unflagged corners are assumed to 48 // be square). 49 static sk_sp<GrFragmentProcessor> Make(GrPrimitiveEdgeType, uint32_t circularCornerFlags, 50 const SkRRect&); 51 52 virtual ~CircularRRectEffect() {} 53 54 const char* name() const override { return "CircularRRect"; } 55 56 const SkRRect& getRRect() const { return fRRect; } 57 58 uint32_t getCircularCornerFlags() const { return fCircularCornerFlags; } 59 60 GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } 61 62private: 63 CircularRRectEffect(GrPrimitiveEdgeType, uint32_t circularCornerFlags, const SkRRect&); 64 65 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 66 67 void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; 68 69 bool onIsEqual(const GrFragmentProcessor& other) const override; 70 71 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; 72 73 SkRRect fRRect; 74 GrPrimitiveEdgeType fEdgeType; 75 uint32_t fCircularCornerFlags; 76 77 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 78 79 typedef GrFragmentProcessor INHERITED; 80}; 81 82sk_sp<GrFragmentProcessor> CircularRRectEffect::Make(GrPrimitiveEdgeType edgeType, 83 uint32_t circularCornerFlags, 84 const SkRRect& rrect) { 85 if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) { 86 return nullptr; 87 } 88 return sk_sp<GrFragmentProcessor>( 89 new CircularRRectEffect(edgeType, circularCornerFlags, rrect)); 90} 91 92void CircularRRectEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { 93 inout->mulByUnknownSingleComponent(); 94} 95 96CircularRRectEffect::CircularRRectEffect(GrPrimitiveEdgeType edgeType, uint32_t circularCornerFlags, 97 const SkRRect& rrect) 98 : INHERITED(kModulatesInput_OptimizationFlag) 99 , fRRect(rrect) 100 , fEdgeType(edgeType) 101 , fCircularCornerFlags(circularCornerFlags) { 102 this->initClassID<CircularRRectEffect>(); 103} 104 105bool CircularRRectEffect::onIsEqual(const GrFragmentProcessor& 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 113GR_DEFINE_FRAGMENT_PROCESSOR_TEST(CircularRRectEffect); 114 115sk_sp<GrFragmentProcessor> CircularRRectEffect::TestCreate(GrProcessorTestData* d) { 116 SkScalar w = d->fRandom->nextRangeScalar(20.f, 1000.f); 117 SkScalar h = d->fRandom->nextRangeScalar(20.f, 1000.f); 118 SkScalar r = d->fRandom->nextRangeF(kRadiusMin, 9.f); 119 SkRRect rrect; 120 rrect.setRectXY(SkRect::MakeWH(w, h), r, r); 121 sk_sp<GrFragmentProcessor> fp; 122 do { 123 GrPrimitiveEdgeType et = 124 (GrPrimitiveEdgeType)d->fRandom->nextULessThan(kGrProcessorEdgeTypeCnt); 125 fp = GrRRectEffect::Make(et, rrect); 126 } while (nullptr == fp); 127 return fp; 128} 129 130////////////////////////////////////////////////////////////////////////////// 131 132class GLCircularRRectEffect : public GrGLSLFragmentProcessor { 133public: 134 GLCircularRRectEffect() { 135 fPrevRRect.setEmpty(); 136 } 137 138 virtual void emitCode(EmitArgs&) override; 139 140 static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*); 141 142protected: 143 void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override; 144 145private: 146 GrGLSLProgramDataManager::UniformHandle fInnerRectUniform; 147 GrGLSLProgramDataManager::UniformHandle fRadiusPlusHalfUniform; 148 SkRRect fPrevRRect; 149 typedef GrGLSLFragmentProcessor INHERITED; 150}; 151 152void GLCircularRRectEffect::emitCode(EmitArgs& args) { 153 const CircularRRectEffect& crre = args.fFp.cast<CircularRRectEffect>(); 154 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; 155 const char *rectName; 156 const char *radiusPlusHalfName; 157 // The inner rect is the rrect bounds inset by the radius. Its left, top, right, and bottom 158 // edges correspond to components x, y, z, and w, respectively. When a side of the rrect has 159 // only rectangular corners, that side's value corresponds to the rect edge's value outset by 160 // half a pixel. 161 fInnerRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 162 kVec4f_GrSLType, kDefault_GrSLPrecision, 163 "innerRect", 164 &rectName); 165 // x is (r + .5) and y is 1/(r + .5) 166 fRadiusPlusHalfUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 167 kVec2f_GrSLType, kDefault_GrSLPrecision, 168 "radiusPlusHalf", 169 &radiusPlusHalfName); 170 171 // If we're on a device with a "real" mediump then the length calculation could overflow. 172 SkString clampedCircleDistance; 173 if (args.fShaderCaps->floatPrecisionVaries()) { 174 clampedCircleDistance.printf("clamp(%s.x * (1.0 - length(dxy * %s.y)), 0.0, 1.0);", 175 radiusPlusHalfName, radiusPlusHalfName); 176 } else { 177 clampedCircleDistance.printf("clamp(%s.x - length(dxy), 0.0, 1.0);", radiusPlusHalfName); 178 } 179 180 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; 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 fragBuilder->codeAppendf("vec2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName); 199 fragBuilder->codeAppendf("vec2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName); 200 fragBuilder->codeAppend("vec2 dxy = max(max(dxy0, dxy1), 0.0);"); 201 fragBuilder->codeAppendf("float alpha = %s;", clampedCircleDistance.c_str()); 202 break; 203 case CircularRRectEffect::kTopLeft_CornerFlag: 204 fragBuilder->codeAppendf("vec2 dxy = max(%s.xy - sk_FragCoord.xy, 0.0);", 205 rectName); 206 fragBuilder->codeAppendf("float rightAlpha = clamp(%s.z - sk_FragCoord.x, 0.0, 1.0);", 207 rectName); 208 fragBuilder->codeAppendf("float bottomAlpha = clamp(%s.w - sk_FragCoord.y, 0.0, 1.0);", 209 rectName); 210 fragBuilder->codeAppendf("float alpha = bottomAlpha * rightAlpha * %s;", 211 clampedCircleDistance.c_str()); 212 break; 213 case CircularRRectEffect::kTopRight_CornerFlag: 214 fragBuilder->codeAppendf("vec2 dxy = max(vec2(sk_FragCoord.x - %s.z, " 215 "%s.y - sk_FragCoord.y), 0.0);", 216 rectName, rectName); 217 fragBuilder->codeAppendf("float leftAlpha = clamp(sk_FragCoord.x - %s.x, 0.0, 1.0);", 218 rectName); 219 fragBuilder->codeAppendf("float bottomAlpha = clamp(%s.w - sk_FragCoord.y, 0.0, 1.0);", 220 rectName); 221 fragBuilder->codeAppendf("float alpha = bottomAlpha * leftAlpha * %s;", 222 clampedCircleDistance.c_str()); 223 break; 224 case CircularRRectEffect::kBottomRight_CornerFlag: 225 fragBuilder->codeAppendf("vec2 dxy = max(sk_FragCoord.xy - %s.zw, 0.0);", 226 rectName); 227 fragBuilder->codeAppendf("float leftAlpha = clamp(sk_FragCoord.x - %s.x, 0.0, 1.0);", 228 rectName); 229 fragBuilder->codeAppendf("float topAlpha = clamp(sk_FragCoord.y - %s.y, 0.0, 1.0);", 230 rectName); 231 fragBuilder->codeAppendf("float alpha = topAlpha * leftAlpha * %s;", 232 clampedCircleDistance.c_str()); 233 break; 234 case CircularRRectEffect::kBottomLeft_CornerFlag: 235 fragBuilder->codeAppendf("vec2 dxy = max(vec2(%s.x - sk_FragCoord.x, sk_FragCoord.y - " 236 "%s.w), 0.0);", 237 rectName, rectName); 238 fragBuilder->codeAppendf("float rightAlpha = clamp(%s.z - sk_FragCoord.x, 0.0, 1.0);", 239 rectName); 240 fragBuilder->codeAppendf("float topAlpha = clamp(sk_FragCoord.y - %s.y, 0.0, 1.0);", 241 rectName); 242 fragBuilder->codeAppendf("float alpha = topAlpha * rightAlpha * %s;", 243 clampedCircleDistance.c_str()); 244 break; 245 case CircularRRectEffect::kLeft_CornerFlags: 246 fragBuilder->codeAppendf("vec2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName); 247 fragBuilder->codeAppendf("float dy1 = sk_FragCoord.y - %s.w;", rectName); 248 fragBuilder->codeAppend("vec2 dxy = max(vec2(dxy0.x, max(dxy0.y, dy1)), 0.0);"); 249 fragBuilder->codeAppendf("float rightAlpha = clamp(%s.z - sk_FragCoord.x, 0.0, 1.0);", 250 rectName); 251 fragBuilder->codeAppendf("float alpha = rightAlpha * %s;", 252 clampedCircleDistance.c_str()); 253 break; 254 case CircularRRectEffect::kTop_CornerFlags: 255 fragBuilder->codeAppendf("vec2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName); 256 fragBuilder->codeAppendf("float dx1 = sk_FragCoord.x - %s.z;", rectName); 257 fragBuilder->codeAppend("vec2 dxy = max(vec2(max(dxy0.x, dx1), dxy0.y), 0.0);"); 258 fragBuilder->codeAppendf("float bottomAlpha = clamp(%s.w - sk_FragCoord.y, 0.0, 1.0);", 259 rectName); 260 fragBuilder->codeAppendf("float alpha = bottomAlpha * %s;", 261 clampedCircleDistance.c_str()); 262 break; 263 case CircularRRectEffect::kRight_CornerFlags: 264 fragBuilder->codeAppendf("float dy0 = %s.y - sk_FragCoord.y;", rectName); 265 fragBuilder->codeAppendf("vec2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName); 266 fragBuilder->codeAppend("vec2 dxy = max(vec2(dxy1.x, max(dy0, dxy1.y)), 0.0);"); 267 fragBuilder->codeAppendf("float leftAlpha = clamp(sk_FragCoord.x - %s.x, 0.0, 1.0);", 268 rectName); 269 fragBuilder->codeAppendf("float alpha = leftAlpha * %s;", 270 clampedCircleDistance.c_str()); 271 break; 272 case CircularRRectEffect::kBottom_CornerFlags: 273 fragBuilder->codeAppendf("float dx0 = %s.x - sk_FragCoord.x;", rectName); 274 fragBuilder->codeAppendf("vec2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName); 275 fragBuilder->codeAppend("vec2 dxy = max(vec2(max(dx0, dxy1.x), dxy1.y), 0.0);"); 276 fragBuilder->codeAppendf("float topAlpha = clamp(sk_FragCoord.y - %s.y, 0.0, 1.0);", 277 rectName); 278 fragBuilder->codeAppendf("float alpha = topAlpha * %s;", 279 clampedCircleDistance.c_str()); 280 break; 281 } 282 283 if (kInverseFillAA_GrProcessorEdgeType == crre.getEdgeType()) { 284 fragBuilder->codeAppend("alpha = 1.0 - alpha;"); 285 } 286 287 fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, 288 (GrGLSLExpr4(args.fInputColor) * GrGLSLExpr1("alpha")).c_str()); 289} 290 291void GLCircularRRectEffect::GenKey(const GrProcessor& processor, const GrShaderCaps&, 292 GrProcessorKeyBuilder* b) { 293 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>(); 294 GR_STATIC_ASSERT(kGrProcessorEdgeTypeCnt <= 8); 295 b->add32((crre.getCircularCornerFlags() << 3) | crre.getEdgeType()); 296} 297 298void GLCircularRRectEffect::onSetData(const GrGLSLProgramDataManager& pdman, 299 const GrProcessor& processor) { 300 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>(); 301 const SkRRect& rrect = crre.getRRect(); 302 if (rrect != fPrevRRect) { 303 SkRect rect = rrect.getBounds(); 304 SkScalar radius = 0; 305 switch (crre.getCircularCornerFlags()) { 306 case CircularRRectEffect::kAll_CornerFlags: 307 SkASSERT(rrect.isSimpleCircular()); 308 radius = rrect.getSimpleRadii().fX; 309 SkASSERT(radius >= kRadiusMin); 310 rect.inset(radius, radius); 311 break; 312 case CircularRRectEffect::kTopLeft_CornerFlag: 313 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 314 rect.fLeft += radius; 315 rect.fTop += radius; 316 rect.fRight += 0.5f; 317 rect.fBottom += 0.5f; 318 break; 319 case CircularRRectEffect::kTopRight_CornerFlag: 320 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX; 321 rect.fLeft -= 0.5f; 322 rect.fTop += radius; 323 rect.fRight -= radius; 324 rect.fBottom += 0.5f; 325 break; 326 case CircularRRectEffect::kBottomRight_CornerFlag: 327 radius = rrect.radii(SkRRect::kLowerRight_Corner).fX; 328 rect.fLeft -= 0.5f; 329 rect.fTop -= 0.5f; 330 rect.fRight -= radius; 331 rect.fBottom -= radius; 332 break; 333 case CircularRRectEffect::kBottomLeft_CornerFlag: 334 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX; 335 rect.fLeft += radius; 336 rect.fTop -= 0.5f; 337 rect.fRight += 0.5f; 338 rect.fBottom -= radius; 339 break; 340 case CircularRRectEffect::kLeft_CornerFlags: 341 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 342 rect.fLeft += radius; 343 rect.fTop += radius; 344 rect.fRight += 0.5f; 345 rect.fBottom -= radius; 346 break; 347 case CircularRRectEffect::kTop_CornerFlags: 348 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX; 349 rect.fLeft += radius; 350 rect.fTop += radius; 351 rect.fRight -= radius; 352 rect.fBottom += 0.5f; 353 break; 354 case CircularRRectEffect::kRight_CornerFlags: 355 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX; 356 rect.fLeft -= 0.5f; 357 rect.fTop += radius; 358 rect.fRight -= radius; 359 rect.fBottom -= radius; 360 break; 361 case CircularRRectEffect::kBottom_CornerFlags: 362 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX; 363 rect.fLeft += radius; 364 rect.fTop -= 0.5f; 365 rect.fRight -= radius; 366 rect.fBottom -= radius; 367 break; 368 default: 369 SkFAIL("Should have been one of the above cases."); 370 } 371 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom); 372 radius += 0.5f; 373 pdman.set2f(fRadiusPlusHalfUniform, radius, 1.f / radius); 374 fPrevRRect = rrect; 375 } 376} 377 378//////////////////////////////////////////////////////////////////////////////////////////////////// 379 380void CircularRRectEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, 381 GrProcessorKeyBuilder* b) const { 382 GLCircularRRectEffect::GenKey(*this, caps, b); 383} 384 385GrGLSLFragmentProcessor* CircularRRectEffect::onCreateGLSLInstance() const { 386 return new GLCircularRRectEffect; 387} 388 389////////////////////////////////////////////////////////////////////////////// 390 391class EllipticalRRectEffect : public GrFragmentProcessor { 392public: 393 static sk_sp<GrFragmentProcessor> Make(GrPrimitiveEdgeType, const SkRRect&); 394 395 virtual ~EllipticalRRectEffect() {} 396 397 const char* name() const override { return "EllipticalRRect"; } 398 399 const SkRRect& getRRect() const { return fRRect; } 400 401 GrPrimitiveEdgeType getEdgeType() const { return fEdgeType; } 402 403private: 404 EllipticalRRectEffect(GrPrimitiveEdgeType, const SkRRect&); 405 406 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 407 408 void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; 409 410 bool onIsEqual(const GrFragmentProcessor& other) const override; 411 412 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; 413 414 SkRRect fRRect; 415 GrPrimitiveEdgeType fEdgeType; 416 417 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 418 419 typedef GrFragmentProcessor INHERITED; 420}; 421 422sk_sp<GrFragmentProcessor> 423EllipticalRRectEffect::Make(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) { 424 if (kFillAA_GrProcessorEdgeType != edgeType && kInverseFillAA_GrProcessorEdgeType != edgeType) { 425 return nullptr; 426 } 427 return sk_sp<GrFragmentProcessor>(new EllipticalRRectEffect(edgeType, rrect)); 428} 429 430void EllipticalRRectEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { 431 inout->mulByUnknownSingleComponent(); 432} 433 434EllipticalRRectEffect::EllipticalRRectEffect(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) 435 : INHERITED(kModulatesInput_OptimizationFlag), fRRect(rrect), fEdgeType(edgeType) { 436 this->initClassID<EllipticalRRectEffect>(); 437} 438 439bool 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 446GR_DEFINE_FRAGMENT_PROCESSOR_TEST(EllipticalRRectEffect); 447 448sk_sp<GrFragmentProcessor> EllipticalRRectEffect::TestCreate(GrProcessorTestData* d) { 449 SkScalar w = d->fRandom->nextRangeScalar(20.f, 1000.f); 450 SkScalar h = d->fRandom->nextRangeScalar(20.f, 1000.f); 451 SkVector r[4]; 452 r[SkRRect::kUpperLeft_Corner].fX = d->fRandom->nextRangeF(kRadiusMin, 9.f); 453 // ensure at least one corner really is elliptical 454 do { 455 r[SkRRect::kUpperLeft_Corner].fY = d->fRandom->nextRangeF(kRadiusMin, 9.f); 456 } while (r[SkRRect::kUpperLeft_Corner].fY == r[SkRRect::kUpperLeft_Corner].fX); 457 458 SkRRect rrect; 459 if (d->fRandom->nextBool()) { 460 // half the time create a four-radii rrect. 461 r[SkRRect::kLowerRight_Corner].fX = d->fRandom->nextRangeF(kRadiusMin, 9.f); 462 r[SkRRect::kLowerRight_Corner].fY = d->fRandom->nextRangeF(kRadiusMin, 9.f); 463 464 r[SkRRect::kUpperRight_Corner].fX = r[SkRRect::kLowerRight_Corner].fX; 465 r[SkRRect::kUpperRight_Corner].fY = r[SkRRect::kUpperLeft_Corner].fY; 466 467 r[SkRRect::kLowerLeft_Corner].fX = r[SkRRect::kUpperLeft_Corner].fX; 468 r[SkRRect::kLowerLeft_Corner].fY = r[SkRRect::kLowerRight_Corner].fY; 469 470 rrect.setRectRadii(SkRect::MakeWH(w, h), r); 471 } else { 472 rrect.setRectXY(SkRect::MakeWH(w, h), r[SkRRect::kUpperLeft_Corner].fX, 473 r[SkRRect::kUpperLeft_Corner].fY); 474 } 475 sk_sp<GrFragmentProcessor> fp; 476 do { 477 GrPrimitiveEdgeType et = 478 (GrPrimitiveEdgeType)d->fRandom->nextULessThan(kGrProcessorEdgeTypeCnt); 479 fp = GrRRectEffect::Make(et, rrect); 480 } while (nullptr == fp); 481 return fp; 482} 483 484////////////////////////////////////////////////////////////////////////////// 485 486class GLEllipticalRRectEffect : public GrGLSLFragmentProcessor { 487public: 488 GLEllipticalRRectEffect() { 489 fPrevRRect.setEmpty(); 490 } 491 492 void emitCode(EmitArgs&) override; 493 494 static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*); 495 496protected: 497 void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override; 498 499private: 500 GrGLSLProgramDataManager::UniformHandle fInnerRectUniform; 501 GrGLSLProgramDataManager::UniformHandle fInvRadiiSqdUniform; 502 GrGLSLProgramDataManager::UniformHandle fScaleUniform; 503 SkRRect fPrevRRect; 504 typedef GrGLSLFragmentProcessor INHERITED; 505}; 506 507void GLEllipticalRRectEffect::emitCode(EmitArgs& args) { 508 const EllipticalRRectEffect& erre = args.fFp.cast<EllipticalRRectEffect>(); 509 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; 510 const char *rectName; 511 // The inner rect is the rrect bounds inset by the x/y radii 512 fInnerRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, 513 kVec4f_GrSLType, kDefault_GrSLPrecision, 514 "innerRect", 515 &rectName); 516 517 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; 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 - sk_FragCoord.xy;", rectName); 531 fragBuilder->codeAppendf("vec2 dxy1 = sk_FragCoord.xy - %s.zw;", 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.fShaderCaps->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 604void GLEllipticalRRectEffect::GenKey(const GrProcessor& effect, const GrShaderCaps&, 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 611void 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 672void EllipticalRRectEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, 673 GrProcessorKeyBuilder* b) const { 674 GLEllipticalRRectEffect::GenKey(*this, caps, b); 675} 676 677GrGLSLFragmentProcessor* EllipticalRRectEffect::onCreateGLSLInstance() const { 678 return new GLEllipticalRRectEffect; 679} 680 681////////////////////////////////////////////////////////////////////////////// 682 683sk_sp<GrFragmentProcessor> GrRRectEffect::Make(GrPrimitiveEdgeType edgeType, const SkRRect& rrect) { 684 if (rrect.isRect()) { 685 return GrConvexPolyEffect::Make(edgeType, rrect.getBounds()); 686 } 687 688 if (rrect.isOval()) { 689 return GrOvalEffect::Make(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::Make(edgeType, rrect.getBounds()); 697 } 698 if (rrect.getSimpleRadii().fX == rrect.getSimpleRadii().fY) { 699 return CircularRRectEffect::Make(edgeType, CircularRRectEffect::kAll_CornerFlags, 700 rrect); 701 } else { 702 return EllipticalRRectEffect::Make(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::Make(edgeType, cornerFlags, *rr); 759 } 760 case CircularRRectEffect::kNone_CornerFlags: 761 return GrConvexPolyEffect::Make(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::Make(edgeType, rrect); 771 } 772 return nullptr; 773 } 774 } 775 } 776 777 return nullptr; 778} 779