SkColorSpace.cpp revision 3e50027f2269195a08e6dd861f504ec5b90b4279
1/* 2 * Copyright 2016 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 "SkColorSpace.h" 9#include "SkColorSpace_Base.h" 10#include "SkColorSpace_XYZ.h" 11#include "SkColorSpacePriv.h" 12#include "SkOnce.h" 13#include "SkPoint3.h" 14 15bool SkColorSpacePrimaries::toXYZD50(SkMatrix44* toXYZ_D50) const { 16 if (!is_zero_to_one(fRX) || !is_zero_to_one(fRY) || 17 !is_zero_to_one(fGX) || !is_zero_to_one(fGY) || 18 !is_zero_to_one(fBX) || !is_zero_to_one(fBY) || 19 !is_zero_to_one(fWX) || !is_zero_to_one(fWY)) 20 { 21 return false; 22 } 23 24 // First, we need to convert xy values (primaries) to XYZ. 25 SkMatrix primaries; 26 primaries.setAll( fRX, fGX, fBX, 27 fRY, fGY, fBY, 28 1.0f - fRX - fRY, 1.0f - fGX - fGY, 1.0f - fBX - fBY); 29 SkMatrix primariesInv; 30 if (!primaries.invert(&primariesInv)) { 31 return false; 32 } 33 34 // Assumes that Y is 1.0f. 35 SkVector3 wXYZ = SkVector3::Make(fWX / fWY, 1.0f, (1.0f - fWX - fWY) / fWY); 36 SkVector3 XYZ; 37 XYZ.fX = primariesInv[0] * wXYZ.fX + primariesInv[1] * wXYZ.fY + primariesInv[2] * wXYZ.fZ; 38 XYZ.fY = primariesInv[3] * wXYZ.fX + primariesInv[4] * wXYZ.fY + primariesInv[5] * wXYZ.fZ; 39 XYZ.fZ = primariesInv[6] * wXYZ.fX + primariesInv[7] * wXYZ.fY + primariesInv[8] * wXYZ.fZ; 40 SkMatrix toXYZ; 41 toXYZ.setAll(XYZ.fX, 0.0f, 0.0f, 42 0.0f, XYZ.fY, 0.0f, 43 0.0f, 0.0f, XYZ.fZ); 44 toXYZ.postConcat(primaries); 45 46 // Now convert toXYZ matrix to toXYZD50. 47 SkVector3 wXYZD50 = SkVector3::Make(0.96422f, 1.0f, 0.82521f); 48 49 // Calculate the chromatic adaptation matrix. We will use the Bradford method, thus 50 // the matrices below. The Bradford method is used by Adobe and is widely considered 51 // to be the best. 52 SkMatrix mA, mAInv; 53 mA.setAll(+0.8951f, +0.2664f, -0.1614f, 54 -0.7502f, +1.7135f, +0.0367f, 55 +0.0389f, -0.0685f, +1.0296f); 56 mAInv.setAll(+0.9869929f, -0.1470543f, +0.1599627f, 57 +0.4323053f, +0.5183603f, +0.0492912f, 58 -0.0085287f, +0.0400428f, +0.9684867f); 59 60 SkVector3 srcCone; 61 srcCone.fX = mA[0] * wXYZ.fX + mA[1] * wXYZ.fY + mA[2] * wXYZ.fZ; 62 srcCone.fY = mA[3] * wXYZ.fX + mA[4] * wXYZ.fY + mA[5] * wXYZ.fZ; 63 srcCone.fZ = mA[6] * wXYZ.fX + mA[7] * wXYZ.fY + mA[8] * wXYZ.fZ; 64 SkVector3 dstCone; 65 dstCone.fX = mA[0] * wXYZD50.fX + mA[1] * wXYZD50.fY + mA[2] * wXYZD50.fZ; 66 dstCone.fY = mA[3] * wXYZD50.fX + mA[4] * wXYZD50.fY + mA[5] * wXYZD50.fZ; 67 dstCone.fZ = mA[6] * wXYZD50.fX + mA[7] * wXYZD50.fY + mA[8] * wXYZD50.fZ; 68 69 SkMatrix DXToD50; 70 DXToD50.setIdentity(); 71 DXToD50[0] = dstCone.fX / srcCone.fX; 72 DXToD50[4] = dstCone.fY / srcCone.fY; 73 DXToD50[8] = dstCone.fZ / srcCone.fZ; 74 DXToD50.postConcat(mAInv); 75 DXToD50.preConcat(mA); 76 77 toXYZ.postConcat(DXToD50); 78 toXYZ_D50->set3x3(toXYZ[0], toXYZ[3], toXYZ[6], 79 toXYZ[1], toXYZ[4], toXYZ[7], 80 toXYZ[2], toXYZ[5], toXYZ[8]); 81 return true; 82} 83 84/////////////////////////////////////////////////////////////////////////////////////////////////// 85 86SkColorSpace_Base::SkColorSpace_Base(sk_sp<SkData> profileData) 87 : fProfileData(std::move(profileData)) 88{} 89 90/** 91 * Checks if our toXYZ matrix is a close match to a known color gamut. 92 * 93 * @param toXYZD50 transformation matrix deduced from profile data 94 * @param standard 3x3 canonical transformation matrix 95 */ 96static bool xyz_almost_equal(const SkMatrix44& toXYZD50, const float* standard) { 97 return color_space_almost_equal(toXYZD50.getFloat(0, 0), standard[0]) && 98 color_space_almost_equal(toXYZD50.getFloat(0, 1), standard[1]) && 99 color_space_almost_equal(toXYZD50.getFloat(0, 2), standard[2]) && 100 color_space_almost_equal(toXYZD50.getFloat(1, 0), standard[3]) && 101 color_space_almost_equal(toXYZD50.getFloat(1, 1), standard[4]) && 102 color_space_almost_equal(toXYZD50.getFloat(1, 2), standard[5]) && 103 color_space_almost_equal(toXYZD50.getFloat(2, 0), standard[6]) && 104 color_space_almost_equal(toXYZD50.getFloat(2, 1), standard[7]) && 105 color_space_almost_equal(toXYZD50.getFloat(2, 2), standard[8]) && 106 color_space_almost_equal(toXYZD50.getFloat(0, 3), 0.0f) && 107 color_space_almost_equal(toXYZD50.getFloat(1, 3), 0.0f) && 108 color_space_almost_equal(toXYZD50.getFloat(2, 3), 0.0f) && 109 color_space_almost_equal(toXYZD50.getFloat(3, 0), 0.0f) && 110 color_space_almost_equal(toXYZD50.getFloat(3, 1), 0.0f) && 111 color_space_almost_equal(toXYZD50.getFloat(3, 2), 0.0f) && 112 color_space_almost_equal(toXYZD50.getFloat(3, 3), 1.0f); 113} 114 115sk_sp<SkColorSpace> SkColorSpace_Base::MakeRGB(SkGammaNamed gammaNamed, const SkMatrix44& toXYZD50) 116{ 117 switch (gammaNamed) { 118 case kSRGB_SkGammaNamed: 119 if (xyz_almost_equal(toXYZD50, gSRGB_toXYZD50)) { 120 return SkColorSpace_Base::MakeNamed(kSRGB_Named); 121 } 122 break; 123 case k2Dot2Curve_SkGammaNamed: 124 if (xyz_almost_equal(toXYZD50, gAdobeRGB_toXYZD50)) { 125 return SkColorSpace_Base::MakeNamed(kAdobeRGB_Named); 126 } 127 break; 128 case kLinear_SkGammaNamed: 129 if (xyz_almost_equal(toXYZD50, gSRGB_toXYZD50)) { 130 return SkColorSpace_Base::MakeNamed(kSRGBLinear_Named); 131 } 132 break; 133 case kNonStandard_SkGammaNamed: 134 // This is not allowed. 135 return nullptr; 136 default: 137 break; 138 } 139 140 return sk_sp<SkColorSpace>(new SkColorSpace_XYZ(gammaNamed, toXYZD50)); 141} 142 143sk_sp<SkColorSpace> SkColorSpace::MakeRGB(RenderTargetGamma gamma, const SkMatrix44& toXYZD50) { 144 switch (gamma) { 145 case kLinear_RenderTargetGamma: 146 return SkColorSpace_Base::MakeRGB(kLinear_SkGammaNamed, toXYZD50); 147 case kSRGB_RenderTargetGamma: 148 return SkColorSpace_Base::MakeRGB(kSRGB_SkGammaNamed, toXYZD50); 149 default: 150 return nullptr; 151 } 152} 153 154sk_sp<SkColorSpace> SkColorSpace::MakeRGB(const SkColorSpaceTransferFn& coeffs, 155 const SkMatrix44& toXYZD50) { 156 if (!is_valid_transfer_fn(coeffs)) { 157 return nullptr; 158 } 159 160 if (is_almost_srgb(coeffs)) { 161 return SkColorSpace::MakeRGB(kSRGB_RenderTargetGamma, toXYZD50); 162 } 163 164 if (is_almost_2dot2(coeffs)) { 165 return SkColorSpace_Base::MakeRGB(k2Dot2Curve_SkGammaNamed, toXYZD50); 166 } 167 168 if (is_almost_linear(coeffs)) { 169 return SkColorSpace_Base::MakeRGB(kLinear_SkGammaNamed, toXYZD50); 170 } 171 172 void* memory = sk_malloc_throw(sizeof(SkGammas) + sizeof(SkColorSpaceTransferFn)); 173 sk_sp<SkGammas> gammas = sk_sp<SkGammas>(new (memory) SkGammas(3)); 174 SkColorSpaceTransferFn* fn = SkTAddOffset<SkColorSpaceTransferFn>(memory, sizeof(SkGammas)); 175 *fn = coeffs; 176 SkGammas::Data data; 177 data.fParamOffset = 0; 178 for (int channel = 0; channel < 3; ++channel) { 179 gammas->fType[channel] = SkGammas::Type::kParam_Type; 180 gammas->fData[channel] = data; 181 } 182 return sk_sp<SkColorSpace>(new SkColorSpace_XYZ(kNonStandard_SkGammaNamed, 183 std::move(gammas), toXYZD50, nullptr)); 184} 185 186sk_sp<SkColorSpace> SkColorSpace::MakeRGB(RenderTargetGamma gamma, Gamut gamut) { 187 SkMatrix44 toXYZD50(SkMatrix44::kUninitialized_Constructor); 188 to_xyz_d50(&toXYZD50, gamut); 189 return SkColorSpace::MakeRGB(gamma, toXYZD50); 190} 191 192sk_sp<SkColorSpace> SkColorSpace::MakeRGB(const SkColorSpaceTransferFn& coeffs, Gamut gamut) { 193 SkMatrix44 toXYZD50(SkMatrix44::kUninitialized_Constructor); 194 to_xyz_d50(&toXYZD50, gamut); 195 return SkColorSpace::MakeRGB(coeffs, toXYZD50); 196} 197 198static SkColorSpace* gAdobeRGB; 199static SkColorSpace* gSRGB; 200static SkColorSpace* gSRGBLinear; 201 202sk_sp<SkColorSpace> SkColorSpace_Base::MakeNamed(Named named) { 203 static SkOnce sRGBOnce; 204 static SkOnce adobeRGBOnce; 205 static SkOnce sRGBLinearOnce; 206 207 switch (named) { 208 case kSRGB_Named: { 209 sRGBOnce([] { 210 SkMatrix44 srgbToxyzD50(SkMatrix44::kUninitialized_Constructor); 211 srgbToxyzD50.set3x3RowMajorf(gSRGB_toXYZD50); 212 213 // Force the mutable type mask to be computed. This avoids races. 214 (void)srgbToxyzD50.getType(); 215 gSRGB = new SkColorSpace_XYZ(kSRGB_SkGammaNamed, srgbToxyzD50); 216 }); 217 return sk_ref_sp<SkColorSpace>(gSRGB); 218 } 219 case kAdobeRGB_Named: { 220 adobeRGBOnce([] { 221 SkMatrix44 adobergbToxyzD50(SkMatrix44::kUninitialized_Constructor); 222 adobergbToxyzD50.set3x3RowMajorf(gAdobeRGB_toXYZD50); 223 224 // Force the mutable type mask to be computed. This avoids races. 225 (void)adobergbToxyzD50.getType(); 226 gAdobeRGB = new SkColorSpace_XYZ(k2Dot2Curve_SkGammaNamed, adobergbToxyzD50); 227 }); 228 return sk_ref_sp<SkColorSpace>(gAdobeRGB); 229 } 230 case kSRGBLinear_Named: { 231 sRGBLinearOnce([] { 232 SkMatrix44 srgbToxyzD50(SkMatrix44::kUninitialized_Constructor); 233 srgbToxyzD50.set3x3RowMajorf(gSRGB_toXYZD50); 234 235 // Force the mutable type mask to be computed. This avoids races. 236 (void)srgbToxyzD50.getType(); 237 gSRGBLinear = new SkColorSpace_XYZ(kLinear_SkGammaNamed, srgbToxyzD50); 238 }); 239 return sk_ref_sp<SkColorSpace>(gSRGBLinear); 240 } 241 default: 242 break; 243 } 244 return nullptr; 245} 246 247sk_sp<SkColorSpace> SkColorSpace::MakeSRGB() { 248 return SkColorSpace_Base::MakeNamed(SkColorSpace_Base::kSRGB_Named); 249} 250 251sk_sp<SkColorSpace> SkColorSpace::MakeSRGBLinear() { 252 return SkColorSpace_Base::MakeNamed(SkColorSpace_Base::kSRGBLinear_Named); 253} 254 255/////////////////////////////////////////////////////////////////////////////////////////////////// 256 257bool SkColorSpace::gammaCloseToSRGB() const { 258 return as_CSB(this)->onGammaCloseToSRGB(); 259} 260 261bool SkColorSpace::gammaIsLinear() const { 262 return as_CSB(this)->onGammaIsLinear(); 263} 264 265bool SkColorSpace::toXYZD50(SkMatrix44* toXYZD50) const { 266 const SkMatrix44* matrix = as_CSB(this)->toXYZD50(); 267 if (matrix) { 268 *toXYZD50 = *matrix; 269 return true; 270 } 271 272 return false; 273} 274 275/////////////////////////////////////////////////////////////////////////////////////////////////// 276 277enum Version { 278 k0_Version, // Initial version, header + flags for matrix and profile 279}; 280 281struct ColorSpaceHeader { 282 /** 283 * It is only valid to set zero or one flags. 284 * Setting multiple flags is invalid. 285 */ 286 287 /** 288 * If kMatrix_Flag is set, we will write 12 floats after the header. 289 */ 290 static constexpr uint8_t kMatrix_Flag = 1 << 0; 291 292 /** 293 * If kICC_Flag is set, we will write an ICC profile after the header. 294 * The ICC profile will be written as a uint32 size, followed immediately 295 * by the data (padded to 4 bytes). 296 */ 297 static constexpr uint8_t kICC_Flag = 1 << 1; 298 299 /** 300 * If kTransferFn_Flag is set, we will write 19 floats after the header. 301 * The first seven represent the transfer fn, and the next twelve are the 302 * matrix. 303 */ 304 static constexpr uint8_t kTransferFn_Flag = 1 << 3; 305 306 static ColorSpaceHeader Pack(Version version, uint8_t named, uint8_t gammaNamed, uint8_t flags) 307 { 308 ColorSpaceHeader header; 309 310 SkASSERT(k0_Version == version); 311 header.fVersion = (uint8_t) version; 312 313 SkASSERT(named <= SkColorSpace_Base::kSRGBLinear_Named); 314 header.fNamed = (uint8_t) named; 315 316 SkASSERT(gammaNamed <= kNonStandard_SkGammaNamed); 317 header.fGammaNamed = (uint8_t) gammaNamed; 318 319 SkASSERT(flags <= kTransferFn_Flag); 320 header.fFlags = flags; 321 return header; 322 } 323 324 uint8_t fVersion; // Always zero 325 uint8_t fNamed; // Must be a SkColorSpace::Named 326 uint8_t fGammaNamed; // Must be a SkGammaNamed 327 uint8_t fFlags; // Some combination of the flags listed above 328}; 329 330size_t SkColorSpace::writeToMemory(void* memory) const { 331 // Start by trying the serialization fast path. If we haven't saved ICC profile data, 332 // we must have a profile that we can serialize easily. 333 if (!as_CSB(this)->fProfileData) { 334 // Profile data is mandatory for A2B0 color spaces. 335 SkASSERT(SkColorSpace_Base::Type::kXYZ == as_CSB(this)->type()); 336 const SkColorSpace_XYZ* thisXYZ = static_cast<const SkColorSpace_XYZ*>(this); 337 // If we have a named profile, only write the enum. 338 const SkGammaNamed gammaNamed = thisXYZ->gammaNamed(); 339 if (this == gSRGB) { 340 if (memory) { 341 *((ColorSpaceHeader*) memory) = ColorSpaceHeader::Pack( 342 k0_Version, SkColorSpace_Base::kSRGB_Named, gammaNamed, 0); 343 } 344 return sizeof(ColorSpaceHeader); 345 } else if (this == gAdobeRGB) { 346 if (memory) { 347 *((ColorSpaceHeader*) memory) = ColorSpaceHeader::Pack( 348 k0_Version, SkColorSpace_Base::kAdobeRGB_Named, gammaNamed, 0); 349 } 350 return sizeof(ColorSpaceHeader); 351 } else if (this == gSRGBLinear) { 352 if (memory) { 353 *((ColorSpaceHeader*) memory) = ColorSpaceHeader::Pack( 354 k0_Version, SkColorSpace_Base::kSRGBLinear_Named, gammaNamed, 0); 355 } 356 return sizeof(ColorSpaceHeader); 357 } 358 359 // If we have a named gamma, write the enum and the matrix. 360 switch (gammaNamed) { 361 case kSRGB_SkGammaNamed: 362 case k2Dot2Curve_SkGammaNamed: 363 case kLinear_SkGammaNamed: { 364 if (memory) { 365 *((ColorSpaceHeader*) memory) = 366 ColorSpaceHeader::Pack(k0_Version, 0, gammaNamed, 367 ColorSpaceHeader::kMatrix_Flag); 368 memory = SkTAddOffset<void>(memory, sizeof(ColorSpaceHeader)); 369 thisXYZ->toXYZD50()->as3x4RowMajorf((float*) memory); 370 } 371 return sizeof(ColorSpaceHeader) + 12 * sizeof(float); 372 } 373 default: { 374 const SkGammas* gammas = thisXYZ->gammas(); 375 SkASSERT(gammas); 376 SkASSERT(gammas->isParametric(0)); 377 SkASSERT(gammas->isParametric(1)); 378 SkASSERT(gammas->isParametric(2)); 379 SkASSERT(gammas->data(0) == gammas->data(1)); 380 SkASSERT(gammas->data(0) == gammas->data(2)); 381 382 if (memory) { 383 *((ColorSpaceHeader*) memory) = 384 ColorSpaceHeader::Pack(k0_Version, 0, thisXYZ->fGammaNamed, 385 ColorSpaceHeader::kTransferFn_Flag); 386 memory = SkTAddOffset<void>(memory, sizeof(ColorSpaceHeader)); 387 388 *(((float*) memory) + 0) = gammas->params(0).fA; 389 *(((float*) memory) + 1) = gammas->params(0).fB; 390 *(((float*) memory) + 2) = gammas->params(0).fC; 391 *(((float*) memory) + 3) = gammas->params(0).fD; 392 *(((float*) memory) + 4) = gammas->params(0).fE; 393 *(((float*) memory) + 5) = gammas->params(0).fF; 394 *(((float*) memory) + 6) = gammas->params(0).fG; 395 memory = SkTAddOffset<void>(memory, 7 * sizeof(float)); 396 397 thisXYZ->fToXYZD50.as3x4RowMajorf((float*) memory); 398 } 399 400 return sizeof(ColorSpaceHeader) + 19 * sizeof(float); 401 } 402 } 403 } 404 405 // Otherwise, serialize the ICC data. 406 size_t profileSize = as_CSB(this)->fProfileData->size(); 407 if (SkAlign4(profileSize) != (uint32_t) SkAlign4(profileSize)) { 408 return 0; 409 } 410 411 if (memory) { 412 *((ColorSpaceHeader*) memory) = ColorSpaceHeader::Pack(k0_Version, 0, 413 kNonStandard_SkGammaNamed, 414 ColorSpaceHeader::kICC_Flag); 415 memory = SkTAddOffset<void>(memory, sizeof(ColorSpaceHeader)); 416 417 *((uint32_t*) memory) = (uint32_t) SkAlign4(profileSize); 418 memory = SkTAddOffset<void>(memory, sizeof(uint32_t)); 419 420 memcpy(memory, as_CSB(this)->fProfileData->data(), profileSize); 421 memset(SkTAddOffset<void>(memory, profileSize), 0, SkAlign4(profileSize) - profileSize); 422 } 423 return sizeof(ColorSpaceHeader) + sizeof(uint32_t) + SkAlign4(profileSize); 424} 425 426sk_sp<SkData> SkColorSpace::serialize() const { 427 size_t size = this->writeToMemory(nullptr); 428 if (0 == size) { 429 return nullptr; 430 } 431 432 sk_sp<SkData> data = SkData::MakeUninitialized(size); 433 this->writeToMemory(data->writable_data()); 434 return data; 435} 436 437sk_sp<SkColorSpace> SkColorSpace::Deserialize(const void* data, size_t length) { 438 if (length < sizeof(ColorSpaceHeader)) { 439 return nullptr; 440 } 441 442 ColorSpaceHeader header = *((const ColorSpaceHeader*) data); 443 data = SkTAddOffset<const void>(data, sizeof(ColorSpaceHeader)); 444 length -= sizeof(ColorSpaceHeader); 445 if (0 == header.fFlags) { 446 return SkColorSpace_Base::MakeNamed((SkColorSpace_Base::Named) header.fNamed); 447 } 448 449 switch ((SkGammaNamed) header.fGammaNamed) { 450 case kSRGB_SkGammaNamed: 451 case k2Dot2Curve_SkGammaNamed: 452 case kLinear_SkGammaNamed: { 453 if (ColorSpaceHeader::kMatrix_Flag != header.fFlags || length < 12 * sizeof(float)) { 454 return nullptr; 455 } 456 457 SkMatrix44 toXYZ(SkMatrix44::kUninitialized_Constructor); 458 toXYZ.set3x4RowMajorf((const float*) data); 459 return SkColorSpace_Base::MakeRGB((SkGammaNamed) header.fGammaNamed, toXYZ); 460 } 461 default: 462 break; 463 } 464 465 switch (header.fFlags) { 466 case ColorSpaceHeader::kICC_Flag: { 467 if (length < sizeof(uint32_t)) { 468 return nullptr; 469 } 470 471 uint32_t profileSize = *((uint32_t*) data); 472 data = SkTAddOffset<const void>(data, sizeof(uint32_t)); 473 length -= sizeof(uint32_t); 474 if (length < profileSize) { 475 return nullptr; 476 } 477 478 return MakeICC(data, profileSize); 479 } 480 case ColorSpaceHeader::kTransferFn_Flag: { 481 if (length < 19 * sizeof(float)) { 482 return nullptr; 483 } 484 485 SkColorSpaceTransferFn transferFn; 486 transferFn.fA = *(((const float*) data) + 0); 487 transferFn.fB = *(((const float*) data) + 1); 488 transferFn.fC = *(((const float*) data) + 2); 489 transferFn.fD = *(((const float*) data) + 3); 490 transferFn.fE = *(((const float*) data) + 4); 491 transferFn.fF = *(((const float*) data) + 5); 492 transferFn.fG = *(((const float*) data) + 6); 493 data = SkTAddOffset<const void>(data, 7 * sizeof(float)); 494 495 SkMatrix44 toXYZ(SkMatrix44::kUninitialized_Constructor); 496 toXYZ.set3x4RowMajorf((const float*) data); 497 return SkColorSpace::MakeRGB(transferFn, toXYZ); 498 } 499 default: 500 return nullptr; 501 } 502} 503 504bool SkColorSpace::Equals(const SkColorSpace* src, const SkColorSpace* dst) { 505 if (src == dst) { 506 return true; 507 } 508 509 if (!src || !dst) { 510 return false; 511 } 512 513 SkData* srcData = as_CSB(src)->fProfileData.get(); 514 SkData* dstData = as_CSB(dst)->fProfileData.get(); 515 if (srcData || dstData) { 516 if (srcData && dstData) { 517 return srcData->size() == dstData->size() && 518 0 == memcmp(srcData->data(), dstData->data(), srcData->size()); 519 } 520 521 return false; 522 } 523 524 // profiles are mandatory for A2B0 color spaces 525 SkASSERT(as_CSB(src)->type() == SkColorSpace_Base::Type::kXYZ); 526 const SkColorSpace_XYZ* srcXYZ = static_cast<const SkColorSpace_XYZ*>(src); 527 const SkColorSpace_XYZ* dstXYZ = static_cast<const SkColorSpace_XYZ*>(dst); 528 529 if (srcXYZ->gammaNamed() != dstXYZ->gammaNamed()) { 530 return false; 531 } 532 533 switch (srcXYZ->gammaNamed()) { 534 case kSRGB_SkGammaNamed: 535 case k2Dot2Curve_SkGammaNamed: 536 case kLinear_SkGammaNamed: 537 if (srcXYZ->toXYZD50Hash() == dstXYZ->toXYZD50Hash()) { 538 SkASSERT(*srcXYZ->toXYZD50() == *dstXYZ->toXYZD50() && "Hash collision"); 539 return true; 540 } 541 return false; 542 default: 543 // It is unlikely that we will reach this case. 544 sk_sp<SkData> serializedSrcData = src->serialize(); 545 sk_sp<SkData> serializedDstData = dst->serialize(); 546 return serializedSrcData->size() == serializedDstData->size() && 547 0 == memcmp(serializedSrcData->data(), serializedDstData->data(), 548 serializedSrcData->size()); 549 } 550} 551