1 /* 2 * Copyright 2006 The Android Open Source Project 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 "SkAvoidXfermode.h" 9 #include "SkColorPriv.h" 10 #include "SkReadBuffer.h" 11 #include "SkWriteBuffer.h" 12 #include "SkString.h" 13 14 SkAvoidXfermode::SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode) { 15 if (tolerance > 255) { 16 tolerance = 255; 17 } 18 fTolerance = SkToU8(tolerance); 19 fOpColor = opColor; 20 fDistMul = (256 << 14) / (tolerance + 1); 21 fMode = mode; 22 } 23 24 SkFlattenable* SkAvoidXfermode::CreateProc(SkReadBuffer& buffer) { 25 const SkColor color = buffer.readColor(); 26 const unsigned tolerance = buffer.readUInt(); 27 const unsigned mode = buffer.readUInt(); 28 return Create(color, tolerance, (Mode)mode); 29 } 30 31 void SkAvoidXfermode::flatten(SkWriteBuffer& buffer) const { 32 buffer.writeColor(fOpColor); 33 buffer.writeUInt(fTolerance); 34 buffer.writeUInt(fMode); 35 } 36 37 // returns 0..31 38 static unsigned color_dist16(uint16_t c, unsigned r, unsigned g, unsigned b) { 39 SkASSERT(r <= SK_R16_MASK); 40 SkASSERT(g <= SK_G16_MASK); 41 SkASSERT(b <= SK_B16_MASK); 42 43 unsigned dr = SkAbs32(SkGetPackedR16(c) - r); 44 unsigned dg = SkAbs32(SkGetPackedG16(c) - g) >> (SK_G16_BITS - SK_R16_BITS); 45 unsigned db = SkAbs32(SkGetPackedB16(c) - b); 46 47 return SkMax32(dr, SkMax32(dg, db)); 48 } 49 50 // returns 0..255 51 static unsigned color_dist32(SkPMColor c, U8CPU r, U8CPU g, U8CPU b) { 52 SkASSERT(r <= 0xFF); 53 SkASSERT(g <= 0xFF); 54 SkASSERT(b <= 0xFF); 55 56 unsigned dr = SkAbs32(SkGetPackedR32(c) - r); 57 unsigned dg = SkAbs32(SkGetPackedG32(c) - g); 58 unsigned db = SkAbs32(SkGetPackedB32(c) - b); 59 60 return SkMax32(dr, SkMax32(dg, db)); 61 } 62 63 static int scale_dist_14(int dist, uint32_t mul, uint32_t sub) { 64 int tmp = dist * mul - sub; 65 int result = (tmp + (1 << 13)) >> 14; 66 67 return result; 68 } 69 70 static inline unsigned Accurate255To256(unsigned x) { 71 return x + (x >> 7); 72 } 73 74 void SkAvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count, 75 const SkAlpha aa[]) const { 76 unsigned opR = SkColorGetR(fOpColor); 77 unsigned opG = SkColorGetG(fOpColor); 78 unsigned opB = SkColorGetB(fOpColor); 79 uint32_t mul = fDistMul; 80 uint32_t sub = (fDistMul - (1 << 14)) << 8; 81 82 int MAX, mask; 83 84 if (kTargetColor_Mode == fMode) { 85 mask = -1; 86 MAX = 255; 87 } else { 88 mask = 0; 89 MAX = 0; 90 } 91 92 for (int i = 0; i < count; i++) { 93 int d = color_dist32(dst[i], opR, opG, opB); 94 // now reverse d if we need to 95 d = MAX + (d ^ mask) - mask; 96 SkASSERT((unsigned)d <= 255); 97 d = Accurate255To256(d); 98 99 d = scale_dist_14(d, mul, sub); 100 SkASSERT(d <= 256); 101 102 if (d > 0) { 103 if (aa) { 104 d = SkAlphaMul(d, Accurate255To256(*aa++)); 105 if (0 == d) { 106 continue; 107 } 108 } 109 dst[i] = SkFourByteInterp256(src[i], dst[i], d); 110 } 111 } 112 } 113 114 static inline U16CPU SkBlend3216(SkPMColor src, U16CPU dst, unsigned scale) { 115 SkASSERT(scale <= 32); 116 scale <<= 3; 117 118 return SkPackRGB16(SkAlphaBlend(SkPacked32ToR16(src), SkGetPackedR16(dst), scale), 119 SkAlphaBlend(SkPacked32ToG16(src), SkGetPackedG16(dst), scale), 120 SkAlphaBlend(SkPacked32ToB16(src), SkGetPackedB16(dst), scale)); 121 } 122 123 void SkAvoidXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count, 124 const SkAlpha aa[]) const { 125 unsigned opR = SkColorGetR(fOpColor) >> (8 - SK_R16_BITS); 126 unsigned opG = SkColorGetG(fOpColor) >> (8 - SK_G16_BITS); 127 unsigned opB = SkColorGetB(fOpColor) >> (8 - SK_R16_BITS); 128 uint32_t mul = fDistMul; 129 uint32_t sub = (fDistMul - (1 << 14)) << SK_R16_BITS; 130 131 int MAX, mask; 132 133 if (kTargetColor_Mode == fMode) { 134 mask = -1; 135 MAX = 31; 136 } else { 137 mask = 0; 138 MAX = 0; 139 } 140 141 for (int i = 0; i < count; i++) { 142 int d = color_dist16(dst[i], opR, opG, opB); 143 // now reverse d if we need to 144 d = MAX + (d ^ mask) - mask; 145 SkASSERT((unsigned)d <= 31); 146 // convert from 0..31 to 0..32 147 d += d >> 4; 148 d = scale_dist_14(d, mul, sub); 149 SkASSERT(d <= 32); 150 151 if (d > 0) { 152 if (aa) { 153 d = SkAlphaMul(d, Accurate255To256(*aa++)); 154 if (0 == d) { 155 continue; 156 } 157 } 158 dst[i] = SkBlend3216(src[i], dst[i], d); 159 } 160 } 161 } 162 163 void SkAvoidXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count, 164 const SkAlpha aa[]) const { 165 } 166 167 168 #if SK_SUPPORT_GPU 169 170 #include "GrFragmentProcessor.h" 171 #include "GrInvariantOutput.h" 172 #include "GrXferProcessor.h" 173 #include "glsl/GrGLSLFragmentProcessor.h" 174 #include "glsl/GrGLSLFragmentShaderBuilder.h" 175 #include "glsl/GrGLSLUniformHandler.h" 176 #include "glsl/GrGLSLXferProcessor.h" 177 178 /////////////////////////////////////////////////////////////////////////////// 179 // Fragment Processor 180 /////////////////////////////////////////////////////////////////////////////// 181 182 class GLAvoidFP; 183 184 class AvoidFP : public GrFragmentProcessor { 185 public: 186 static const GrFragmentProcessor* Create(SkColor opColor, uint8_t tolerance, 187 SkAvoidXfermode::Mode mode, 188 const GrFragmentProcessor* dst) { 189 return new AvoidFP(opColor, tolerance, mode, dst); 190 } 191 192 ~AvoidFP() override { } 193 194 const char* name() const override { return "Avoid"; } 195 196 SkString dumpInfo() const override { 197 SkString str; 198 str.appendf("Color: 0x%08x Tol: %d Mode: %s", 199 fOpColor, fTolerance, 200 fMode == SkAvoidXfermode::kAvoidColor_Mode ? "Avoid" : "Target"); 201 return str; 202 } 203 204 SkColor opColor() const { return fOpColor; } 205 uint8_t tol() const { return fTolerance; } 206 SkAvoidXfermode::Mode mode() const { return fMode; } 207 208 private: 209 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; 210 211 void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; 212 213 bool onIsEqual(const GrFragmentProcessor& fpBase) const override { 214 const AvoidFP& fp = fpBase.cast<AvoidFP>(); 215 216 return fOpColor == fp.fOpColor && 217 fTolerance == fp.fTolerance && 218 fMode == fp.fMode; 219 } 220 221 void onComputeInvariantOutput(GrInvariantOutput* inout) const override { 222 inout->setToUnknown(GrInvariantOutput::kWill_ReadInput); 223 } 224 225 AvoidFP(SkColor opColor, uint8_t tolerance, 226 SkAvoidXfermode::Mode mode, const GrFragmentProcessor* dst) 227 : fOpColor(opColor), fTolerance(tolerance), fMode(mode) { 228 this->initClassID<AvoidFP>(); 229 230 SkASSERT(dst); 231 SkDEBUGCODE(int dstIndex = )this->registerChildProcessor(dst); 232 SkASSERT(0 == dstIndex); 233 } 234 235 SkColor fOpColor; 236 uint8_t fTolerance; 237 SkAvoidXfermode::Mode fMode; 238 239 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 240 typedef GrFragmentProcessor INHERITED; 241 }; 242 243 /////////////////////////////////////////////////////////////////////////////// 244 245 // Add common code for calculating avoid's distance value 246 static void add_avoid_code(GrGLSLFragmentBuilder* fragBuilder, 247 const char* dstColor, 248 const char* srcCoverage, 249 const char* kColorAndTolUni, 250 const char* kCoverageName, 251 SkAvoidXfermode::Mode mode) { 252 253 fragBuilder->codeAppendf("vec3 temp = %s.rgb - %s.rgb;", dstColor, kColorAndTolUni); 254 fragBuilder->codeAppendf("float dist = max(max(abs(temp.r), abs(temp.g)), abs(temp.b));"); 255 256 if (SkAvoidXfermode::kTargetColor_Mode == mode) { 257 fragBuilder->codeAppendf("dist = 1.0 - dist;"); 258 } 259 260 // the 'a' portion of the uniform is the scaled and inverted tolerance 261 fragBuilder->codeAppendf("dist = dist * %s.a - (%s.a - 1.0);", 262 kColorAndTolUni, kColorAndTolUni); 263 264 fragBuilder->codeAppendf("vec4 %s = vec4(dist);", kCoverageName); 265 if (srcCoverage) { 266 fragBuilder->codeAppendf("%s *= %s;", kCoverageName, srcCoverage); 267 } 268 } 269 270 class GLAvoidFP : public GrGLSLFragmentProcessor { 271 public: 272 void emitCode(EmitArgs& args) override { 273 const AvoidFP& avoid = args.fFp.cast<AvoidFP>(); 274 275 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; 276 SkString dstColor("dstColor"); 277 this->emitChild(0, nullptr, &dstColor, args); 278 279 fColorAndTolUni = args.fUniformHandler->addUniform( 280 kFragment_GrShaderFlag, 281 kVec4f_GrSLType, kDefault_GrSLPrecision, 282 "colorAndTol"); 283 const char* kColorAndTolUni = args.fUniformHandler->getUniformCStr(fColorAndTolUni); 284 285 const char* kCoverageName = "newCoverage"; 286 287 // add_avoid_code emits the code needed to compute the new coverage 288 add_avoid_code(fragBuilder, 289 dstColor.c_str(), nullptr, 290 kColorAndTolUni, kCoverageName, avoid.mode()); 291 292 // The raster implementation's quantization and behavior yield a very noticeable 293 // effect near zero (0.0039 = 1/256). 294 fragBuilder->codeAppendf("if (%s.r < 0.0039) { %s = %s; } else {", 295 kCoverageName, args.fOutputColor, dstColor.c_str()); 296 fragBuilder->codeAppendf("%s = %s * %s + (vec4(1.0)-%s) * %s;", 297 args.fOutputColor, 298 kCoverageName, args.fInputColor ? args.fInputColor : "vec4(1.0)", 299 kCoverageName, dstColor.c_str()); 300 fragBuilder->codeAppend("}"); 301 } 302 303 static void GenKey(const GrProcessor& proc, const GrGLSLCaps&, GrProcessorKeyBuilder* b) { 304 const AvoidFP& avoid = proc.cast<AvoidFP>(); 305 uint32_t key = avoid.mode() == SkAvoidXfermode::kTargetColor_Mode ? 1 : 0; 306 b->add32(key); 307 } 308 309 protected: 310 void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) override { 311 const AvoidFP& avoid = proc.cast<AvoidFP>(); 312 pdman.set4f(fColorAndTolUni, 313 SkColorGetR(avoid.opColor())/255.0f, 314 SkColorGetG(avoid.opColor())/255.0f, 315 SkColorGetB(avoid.opColor())/255.0f, 316 256.0f/(avoid.tol()+1.0f)); 317 } 318 319 private: 320 GrGLSLProgramDataManager::UniformHandle fColorAndTolUni; 321 322 typedef GrGLSLFragmentProcessor INHERITED; 323 }; 324 325 /////////////////////////////////////////////////////////////////////////////// 326 327 GrGLSLFragmentProcessor* AvoidFP::onCreateGLSLInstance() const { 328 return new GLAvoidFP; 329 } 330 331 void AvoidFP::onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const { 332 GLAvoidFP::GenKey(*this, caps, b); 333 } 334 335 const GrFragmentProcessor* AvoidFP::TestCreate(GrProcessorTestData* d) { 336 SkColor opColor = d->fRandom->nextU(); 337 uint8_t tolerance = d->fRandom->nextBits(8); 338 SkAvoidXfermode::Mode mode = d->fRandom->nextBool() ? SkAvoidXfermode::kAvoidColor_Mode 339 : SkAvoidXfermode::kTargetColor_Mode; 340 341 SkAutoTUnref<const GrFragmentProcessor> dst(GrProcessorUnitTest::CreateChildFP(d)); 342 return new AvoidFP(opColor, tolerance, mode, dst); 343 } 344 345 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(AvoidFP); 346 347 /////////////////////////////////////////////////////////////////////////////// 348 // Xfer Processor 349 /////////////////////////////////////////////////////////////////////////////// 350 351 class AvoidXP : public GrXferProcessor { 352 public: 353 AvoidXP(const DstTexture* dstTexture, bool hasMixedSamples, 354 SkColor opColor, uint8_t tolerance, SkAvoidXfermode::Mode mode) 355 : INHERITED(dstTexture, true, hasMixedSamples) 356 , fOpColor(opColor) 357 , fTolerance(tolerance) 358 , fMode(mode) { 359 this->initClassID<AvoidXP>(); 360 } 361 362 const char* name() const override { return "Avoid"; } 363 364 GrGLSLXferProcessor* createGLSLInstance() const override; 365 366 SkColor opColor() const { return fOpColor; } 367 uint8_t tol() const { return fTolerance; } 368 SkAvoidXfermode::Mode mode() const { return fMode; } 369 370 private: 371 GrXferProcessor::OptFlags onGetOptimizations(const GrPipelineOptimizations& optimizations, 372 bool doesStencilWrite, 373 GrColor* overrideColor, 374 const GrCaps& caps) const override { 375 return GrXferProcessor::kNone_OptFlags; 376 } 377 378 void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override; 379 380 bool onIsEqual(const GrXferProcessor& xpBase) const override { 381 const AvoidXP& xp = xpBase.cast<AvoidXP>(); 382 383 return fOpColor == xp.fOpColor && 384 fTolerance == xp.fTolerance && 385 fMode == xp.fMode; 386 } 387 388 SkColor fOpColor; 389 uint8_t fTolerance; 390 SkAvoidXfermode::Mode fMode; 391 392 typedef GrXferProcessor INHERITED; 393 }; 394 395 /////////////////////////////////////////////////////////////////////////////// 396 397 class GLAvoidXP : public GrGLSLXferProcessor { 398 public: 399 static void GenKey(const GrProcessor& processor, const GrGLSLCaps&, GrProcessorKeyBuilder* b) { 400 const AvoidXP& avoid = processor.cast<AvoidXP>(); 401 uint32_t key = SkAvoidXfermode::kTargetColor_Mode == avoid.mode() ? 1 : 0; 402 b->add32(key); 403 } 404 405 private: 406 void emitBlendCodeForDstRead(GrGLSLXPFragmentBuilder* fragBuilder, 407 GrGLSLUniformHandler* uniformHandler, 408 const char* srcColor, 409 const char* srcCoverage, 410 const char* dstColor, 411 const char* outColor, 412 const char* outColorSecondary, 413 const GrXferProcessor& proc) override { 414 const AvoidXP& avoid = proc.cast<AvoidXP>(); 415 416 fColorAndTolUni = uniformHandler->addUniform(kFragment_GrShaderFlag, 417 kVec4f_GrSLType, kDefault_GrSLPrecision, 418 "colorAndTol"); 419 const char* kColorandTolUni = uniformHandler->getUniformCStr(fColorAndTolUni); 420 421 const char* kCoverageName = "newCoverage"; 422 423 // add_avoid_code emits the code needed to compute the new coverage 424 add_avoid_code(fragBuilder, 425 dstColor, srcCoverage, 426 kColorandTolUni, kCoverageName, avoid.mode()); 427 428 // The raster implementation's quantization and behavior yield a very noticeable 429 // effect near zero (0.0039 = 1/256). 430 fragBuilder->codeAppendf("if (%s.r < 0.0039) { %s = %s; } else {", 431 kCoverageName, outColor, dstColor); 432 fragBuilder->codeAppendf("%s = %s;", outColor, srcColor ? srcColor : "vec4(1.0)"); 433 INHERITED::DefaultCoverageModulation(fragBuilder, kCoverageName, dstColor, outColor, 434 outColorSecondary, proc); 435 fragBuilder->codeAppend("}"); 436 } 437 438 void onSetData(const GrGLSLProgramDataManager& pdman, 439 const GrXferProcessor& processor) override { 440 const AvoidXP& avoid = processor.cast<AvoidXP>(); 441 pdman.set4f(fColorAndTolUni, 442 SkColorGetR(avoid.opColor())/255.0f, 443 SkColorGetG(avoid.opColor())/255.0f, 444 SkColorGetB(avoid.opColor())/255.0f, 445 256.0f/(avoid.tol()+1.0f)); 446 }; 447 448 GrGLSLProgramDataManager::UniformHandle fColorAndTolUni; 449 450 typedef GrGLSLXferProcessor INHERITED; 451 }; 452 453 /////////////////////////////////////////////////////////////////////////////// 454 455 void AvoidXP::onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const { 456 GLAvoidXP::GenKey(*this, caps, b); 457 } 458 459 GrGLSLXferProcessor* AvoidXP::createGLSLInstance() const { return new GLAvoidXP; } 460 461 /////////////////////////////////////////////////////////////////////////////// 462 class GrAvoidXPFactory : public GrXPFactory { 463 public: 464 static GrXPFactory* Create(SkColor opColor, uint8_t tolerance, 465 SkAvoidXfermode::Mode mode) { 466 return new GrAvoidXPFactory(opColor, tolerance, mode); 467 } 468 469 void getInvariantBlendedColor(const GrProcOptInfo& colorPOI, 470 GrXPFactory::InvariantBlendedColor* blendedColor) const override { 471 blendedColor->fWillBlendWithDst = true; 472 blendedColor->fKnownColorFlags = kNone_GrColorComponentFlags; 473 } 474 475 private: 476 GrAvoidXPFactory(SkColor opColor, uint8_t tolerance, SkAvoidXfermode::Mode mode) 477 : fOpColor(opColor) 478 , fTolerance(tolerance) 479 , fMode(mode) { 480 this->initClassID<GrAvoidXPFactory>(); 481 } 482 483 GrXferProcessor* onCreateXferProcessor(const GrCaps& caps, 484 const GrPipelineOptimizations& optimizations, 485 bool hasMixedSamples, 486 const DstTexture* dstTexture) const override { 487 return new AvoidXP(dstTexture, hasMixedSamples, fOpColor, fTolerance, fMode); 488 } 489 490 bool onWillReadDstColor(const GrCaps& caps, 491 const GrPipelineOptimizations& optimizations, 492 bool hasMixedSamples) const override { 493 return true; 494 } 495 496 bool onIsEqual(const GrXPFactory& xpfBase) const override { 497 const GrAvoidXPFactory& xpf = xpfBase.cast<GrAvoidXPFactory>(); 498 return fOpColor == xpf.fOpColor && 499 fTolerance == xpf.fTolerance && 500 fMode == xpf.fMode; 501 } 502 503 GR_DECLARE_XP_FACTORY_TEST; 504 505 SkColor fOpColor; 506 uint8_t fTolerance; 507 SkAvoidXfermode::Mode fMode; 508 509 typedef GrXPFactory INHERITED; 510 }; 511 512 GR_DEFINE_XP_FACTORY_TEST(GrAvoidXPFactory); 513 514 const GrXPFactory* GrAvoidXPFactory::TestCreate(GrProcessorTestData* d) { 515 SkColor opColor = d->fRandom->nextU(); 516 uint8_t tolerance = d->fRandom->nextBits(8); 517 SkAvoidXfermode::Mode mode = d->fRandom->nextBool() ? SkAvoidXfermode::kAvoidColor_Mode 518 : SkAvoidXfermode::kTargetColor_Mode; 519 return GrAvoidXPFactory::Create(opColor, tolerance, mode); 520 } 521 522 /////////////////////////////////////////////////////////////////////////////// 523 524 const GrFragmentProcessor* SkAvoidXfermode::getFragmentProcessorForImageFilter( 525 const GrFragmentProcessor* dst) const { 526 return AvoidFP::Create(fOpColor, fTolerance, fMode, dst); 527 } 528 529 GrXPFactory* SkAvoidXfermode::asXPFactory() const { 530 return GrAvoidXPFactory::Create(fOpColor, fTolerance, fMode); 531 } 532 #endif 533 534 #ifndef SK_IGNORE_TO_STRING 535 void SkAvoidXfermode::toString(SkString* str) const { 536 str->append("AvoidXfermode: opColor: "); 537 str->appendHex(fOpColor); 538 str->appendf("tolerance: %d ", fTolerance); 539 540 static const char* gModeStrings[] = { "Avoid", "Target" }; 541 542 str->appendf("mode: %s", gModeStrings[fMode]); 543 } 544 #endif 545
