| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkAutoMalloc.h" |
| #include "SkColorSpace_Base.h" |
| #include "SkColorSpace_XYZ.h" |
| #include "SkColorSpacePriv.h" |
| #include "SkColorSpaceXformPriv.h" |
| #include "SkEndian.h" |
| #include "SkFixed.h" |
| #include "SkICC.h" |
| #include "SkICCPriv.h" |
| |
| SkICC::SkICC(sk_sp<SkColorSpace> colorSpace) |
| : fColorSpace(std::move(colorSpace)) |
| {} |
| |
| sk_sp<SkICC> SkICC::Make(const void* ptr, size_t len) { |
| sk_sp<SkColorSpace> colorSpace = SkColorSpace::MakeICC(ptr, len); |
| if (!colorSpace) { |
| return nullptr; |
| } |
| |
| return sk_sp<SkICC>(new SkICC(std::move(colorSpace))); |
| } |
| |
| bool SkICC::toXYZD50(SkMatrix44* toXYZD50) const { |
| const SkMatrix44* m = as_CSB(fColorSpace)->toXYZD50(); |
| if (!m) { |
| return false; |
| } |
| |
| *toXYZD50 = *m; |
| return true; |
| } |
| |
| bool SkICC::isNumericalTransferFn(SkColorSpaceTransferFn* coeffs) const { |
| return as_CSB(fColorSpace)->onIsNumericalTransferFn(coeffs); |
| } |
| |
| static const int kDefaultTableSize = 512; // Arbitrary |
| |
| void fn_to_table(float* tablePtr, const SkColorSpaceTransferFn& fn) { |
| // Y = (aX + b)^g + e for X >= d |
| // Y = cX + f otherwise |
| for (int i = 0; i < kDefaultTableSize; i++) { |
| float x = ((float) i) / ((float) (kDefaultTableSize - 1)); |
| if (x >= fn.fD) { |
| tablePtr[i] = clamp_0_1(powf(fn.fA * x + fn.fB, fn.fG) + fn.fE); |
| } else { |
| tablePtr[i] = clamp_0_1(fn.fC * x + fn.fF); |
| } |
| } |
| } |
| |
| void copy_to_table(float* tablePtr, const SkGammas* gammas, int index) { |
| SkASSERT(gammas->isTable(index)); |
| const float* ptr = gammas->table(index); |
| const size_t bytes = gammas->tableSize(index) * sizeof(float); |
| memcpy(tablePtr, ptr, bytes); |
| } |
| |
| bool SkICC::rawTransferFnData(Tables* tables) const { |
| if (SkColorSpace_Base::Type::kA2B == as_CSB(fColorSpace)->type()) { |
| return false; |
| } |
| SkColorSpace_XYZ* colorSpace = (SkColorSpace_XYZ*) fColorSpace.get(); |
| |
| SkColorSpaceTransferFn fn; |
| if (this->isNumericalTransferFn(&fn)) { |
| tables->fStorage = SkData::MakeUninitialized(kDefaultTableSize * sizeof(float)); |
| fn_to_table((float*) tables->fStorage->writable_data(), fn); |
| tables->fRed.fOffset = tables->fGreen.fOffset = tables->fBlue.fOffset = 0; |
| tables->fRed.fCount = tables->fGreen.fCount = tables->fBlue.fCount = kDefaultTableSize; |
| return true; |
| } |
| |
| const SkGammas* gammas = colorSpace->gammas(); |
| SkASSERT(gammas); |
| if (gammas->data(0) == gammas->data(1) && gammas->data(0) == gammas->data(2)) { |
| SkASSERT(gammas->isTable(0)); |
| tables->fStorage = SkData::MakeUninitialized(gammas->tableSize(0) * sizeof(float)); |
| copy_to_table((float*) tables->fStorage->writable_data(), gammas, 0); |
| tables->fRed.fOffset = tables->fGreen.fOffset = tables->fBlue.fOffset = 0; |
| tables->fRed.fCount = tables->fGreen.fCount = tables->fBlue.fCount = gammas->tableSize(0); |
| return true; |
| } |
| |
| // Determine the storage size. |
| size_t storageSize = 0; |
| for (int i = 0; i < 3; i++) { |
| if (gammas->isTable(i)) { |
| storageSize += gammas->tableSize(i) * sizeof(float); |
| } else { |
| storageSize += kDefaultTableSize * sizeof(float); |
| } |
| } |
| |
| // Fill in the tables. |
| tables->fStorage = SkData::MakeUninitialized(storageSize); |
| float* ptr = (float*) tables->fStorage->writable_data(); |
| size_t offset = 0; |
| Channel rgb[3]; |
| for (int i = 0; i < 3; i++) { |
| if (gammas->isTable(i)) { |
| copy_to_table(ptr, gammas, i); |
| rgb[i].fOffset = offset; |
| rgb[i].fCount = gammas->tableSize(i); |
| offset += rgb[i].fCount * sizeof(float); |
| ptr += rgb[i].fCount; |
| continue; |
| } |
| |
| if (gammas->isNamed(i)) { |
| SkAssertResult(named_to_parametric(&fn, gammas->data(i).fNamed)); |
| } else if (gammas->isValue(i)) { |
| value_to_parametric(&fn, gammas->data(i).fValue); |
| } else { |
| SkASSERT(gammas->isParametric(i)); |
| fn = gammas->params(i); |
| } |
| |
| fn_to_table(ptr, fn); |
| rgb[i].fOffset = offset; |
| rgb[i].fCount = kDefaultTableSize; |
| offset += kDefaultTableSize * sizeof(float); |
| ptr += kDefaultTableSize; |
| } |
| |
| tables->fRed = rgb[0]; |
| tables->fGreen = rgb[1]; |
| tables->fBlue = rgb[2]; |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| // Google Skia (UTF-16) |
| static constexpr uint8_t kDescriptionTagBody[] = { |
| 0x00, 0x47, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x67, 0x00, 0x6c, 0x00, 0x65, 0x00, 0x20, 0x00, |
| 0x53, 0x00, 0x6b, 0x00, 0x69, 0x00, 0x61, 0x00, 0x20, |
| }; |
| static_assert(SkIsAlign4(sizeof(kDescriptionTagBody)), "Description must be aligned to 4-bytes."); |
| static constexpr uint32_t kDescriptionTagHeader[7] { |
| SkEndian_SwapBE32(kTAG_TextType), // Type signature |
| 0, // Reserved |
| SkEndian_SwapBE32(1), // Number of records |
| SkEndian_SwapBE32(12), // Record size (must be 12) |
| SkEndian_SwapBE32(SkSetFourByteTag('e', 'n', 'U', 'S')), // English USA |
| SkEndian_SwapBE32(sizeof(kDescriptionTagBody)), // Length of string |
| SkEndian_SwapBE32(28), // Offset of string |
| }; |
| |
| static constexpr uint32_t kWhitePointTag[5] { |
| SkEndian_SwapBE32(kXYZ_PCSSpace), |
| 0, |
| SkEndian_SwapBE32(0x0000f6d6), // X = 0.96420 (D50) |
| SkEndian_SwapBE32(0x00010000), // Y = 1.00000 (D50) |
| SkEndian_SwapBE32(0x0000d32d), // Z = 0.82491 (D50) |
| }; |
| |
| // Google Inc. 2016 (UTF-16) |
| static constexpr uint8_t kCopyrightTagBody[] = { |
| 0x00, 0x47, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x67, 0x00, 0x6c, 0x00, 0x65, 0x00, 0x20, 0x00, |
| 0x49, 0x00, 0x6e, 0x00, 0x63, 0x00, 0x2e, 0x00, 0x20, 0x00, 0x32, 0x00, 0x30, 0x00, 0x31, |
| 0x00, 0x36, |
| }; |
| static_assert(SkIsAlign4(sizeof(kCopyrightTagBody)), "Copyright must be aligned to 4-bytes."); |
| static constexpr uint32_t kCopyrightTagHeader[7] { |
| SkEndian_SwapBE32(kTAG_TextType), // Type signature |
| 0, // Reserved |
| SkEndian_SwapBE32(1), // Number of records |
| SkEndian_SwapBE32(12), // Record size (must be 12) |
| SkEndian_SwapBE32(SkSetFourByteTag('e', 'n', 'U', 'S')), // English USA |
| SkEndian_SwapBE32(sizeof(kCopyrightTagBody)), // Length of string |
| SkEndian_SwapBE32(28), // Offset of string |
| }; |
| |
| // We will write a profile with the minimum nine required tags. |
| static constexpr uint32_t kICCNumEntries = 9; |
| |
| static constexpr uint32_t kTAG_desc = SkSetFourByteTag('d', 'e', 's', 'c'); |
| static constexpr uint32_t kTAG_desc_Bytes = sizeof(kDescriptionTagHeader) + |
| sizeof(kDescriptionTagBody); |
| static constexpr uint32_t kTAG_desc_Offset = kICCHeaderSize + |
| kICCNumEntries * kICCTagTableEntrySize; |
| |
| static constexpr uint32_t kTAG_XYZ_Bytes = 20; |
| static constexpr uint32_t kTAG_rXYZ_Offset = kTAG_desc_Offset + kTAG_desc_Bytes; |
| static constexpr uint32_t kTAG_gXYZ_Offset = kTAG_rXYZ_Offset + kTAG_XYZ_Bytes; |
| static constexpr uint32_t kTAG_bXYZ_Offset = kTAG_gXYZ_Offset + kTAG_XYZ_Bytes; |
| |
| static constexpr uint32_t kTAG_TRC_Bytes = 40; |
| static constexpr uint32_t kTAG_rTRC_Offset = kTAG_bXYZ_Offset + kTAG_XYZ_Bytes; |
| static constexpr uint32_t kTAG_gTRC_Offset = kTAG_rTRC_Offset; |
| static constexpr uint32_t kTAG_bTRC_Offset = kTAG_rTRC_Offset; |
| |
| static constexpr uint32_t kTAG_wtpt = SkSetFourByteTag('w', 't', 'p', 't'); |
| static constexpr uint32_t kTAG_wtpt_Offset = kTAG_bTRC_Offset + kTAG_TRC_Bytes; |
| |
| static constexpr uint32_t kTAG_cprt = SkSetFourByteTag('c', 'p', 'r', 't'); |
| static constexpr uint32_t kTAG_cprt_Bytes = sizeof(kCopyrightTagHeader) + |
| sizeof(kCopyrightTagBody); |
| static constexpr uint32_t kTAG_cprt_Offset = kTAG_wtpt_Offset + kTAG_XYZ_Bytes; |
| |
| static constexpr uint32_t kICCProfileSize = kTAG_cprt_Offset + kTAG_cprt_Bytes; |
| |
| static constexpr uint32_t kICCHeader[kICCHeaderSize / 4] { |
| SkEndian_SwapBE32(kICCProfileSize), // Size of the profile |
| 0, // Preferred CMM type (ignored) |
| SkEndian_SwapBE32(0x02100000), // Version 2.1 |
| SkEndian_SwapBE32(kDisplay_Profile), // Display device profile |
| SkEndian_SwapBE32(kRGB_ColorSpace), // RGB input color space |
| SkEndian_SwapBE32(kXYZ_PCSSpace), // XYZ profile connection space |
| 0, 0, 0, // Date and time (ignored) |
| SkEndian_SwapBE32(kACSP_Signature), // Profile signature |
| 0, // Platform target (ignored) |
| 0x00000000, // Flags: not embedded, can be used independently |
| 0, // Device manufacturer (ignored) |
| 0, // Device model (ignored) |
| 0, 0, // Device attributes (ignored) |
| SkEndian_SwapBE32(1), // Relative colorimetric rendering intent |
| SkEndian_SwapBE32(0x0000f6d6), // D50 standard illuminant (X) |
| SkEndian_SwapBE32(0x00010000), // D50 standard illuminant (Y) |
| SkEndian_SwapBE32(0x0000d32d), // D50 standard illuminant (Z) |
| 0, // Profile creator (ignored) |
| 0, 0, 0, 0, // Profile id checksum (ignored) |
| 0, 0, 0, 0, 0, 0, 0, // Reserved (ignored) |
| SkEndian_SwapBE32(kICCNumEntries), // Number of tags |
| }; |
| |
| static constexpr uint32_t kICCTagTable[3 * kICCNumEntries] { |
| // Profile description |
| SkEndian_SwapBE32(kTAG_desc), |
| SkEndian_SwapBE32(kTAG_desc_Offset), |
| SkEndian_SwapBE32(kTAG_desc_Bytes), |
| |
| // rXYZ |
| SkEndian_SwapBE32(kTAG_rXYZ), |
| SkEndian_SwapBE32(kTAG_rXYZ_Offset), |
| SkEndian_SwapBE32(kTAG_XYZ_Bytes), |
| |
| // gXYZ |
| SkEndian_SwapBE32(kTAG_gXYZ), |
| SkEndian_SwapBE32(kTAG_gXYZ_Offset), |
| SkEndian_SwapBE32(kTAG_XYZ_Bytes), |
| |
| // bXYZ |
| SkEndian_SwapBE32(kTAG_bXYZ), |
| SkEndian_SwapBE32(kTAG_bXYZ_Offset), |
| SkEndian_SwapBE32(kTAG_XYZ_Bytes), |
| |
| // rTRC |
| SkEndian_SwapBE32(kTAG_rTRC), |
| SkEndian_SwapBE32(kTAG_rTRC_Offset), |
| SkEndian_SwapBE32(kTAG_TRC_Bytes), |
| |
| // gTRC |
| SkEndian_SwapBE32(kTAG_gTRC), |
| SkEndian_SwapBE32(kTAG_gTRC_Offset), |
| SkEndian_SwapBE32(kTAG_TRC_Bytes), |
| |
| // bTRC |
| SkEndian_SwapBE32(kTAG_bTRC), |
| SkEndian_SwapBE32(kTAG_bTRC_Offset), |
| SkEndian_SwapBE32(kTAG_TRC_Bytes), |
| |
| // White point |
| SkEndian_SwapBE32(kTAG_wtpt), |
| SkEndian_SwapBE32(kTAG_wtpt_Offset), |
| SkEndian_SwapBE32(kTAG_XYZ_Bytes), |
| |
| // Copyright |
| SkEndian_SwapBE32(kTAG_cprt), |
| SkEndian_SwapBE32(kTAG_cprt_Offset), |
| SkEndian_SwapBE32(kTAG_cprt_Bytes), |
| }; |
| |
| static void write_xyz_tag(uint32_t* ptr, const SkMatrix44& toXYZ, int col) { |
| ptr[0] = SkEndian_SwapBE32(kXYZ_PCSSpace); |
| ptr[1] = 0; |
| ptr[2] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(0, col))); |
| ptr[3] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(1, col))); |
| ptr[4] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(2, col))); |
| } |
| |
| static void write_trc_tag(uint32_t* ptr, const SkColorSpaceTransferFn& fn) { |
| ptr[0] = SkEndian_SwapBE32(kTAG_ParaCurveType); |
| ptr[1] = 0; |
| ptr[2] = (uint32_t) (SkEndian_SwapBE16(kGABCDEF_ParaCurveType)); |
| ptr[3] = SkEndian_SwapBE32(SkFloatToFixed(fn.fG)); |
| ptr[4] = SkEndian_SwapBE32(SkFloatToFixed(fn.fA)); |
| ptr[5] = SkEndian_SwapBE32(SkFloatToFixed(fn.fB)); |
| ptr[6] = SkEndian_SwapBE32(SkFloatToFixed(fn.fC)); |
| ptr[7] = SkEndian_SwapBE32(SkFloatToFixed(fn.fD)); |
| ptr[8] = SkEndian_SwapBE32(SkFloatToFixed(fn.fE)); |
| ptr[9] = SkEndian_SwapBE32(SkFloatToFixed(fn.fF)); |
| } |
| |
| static bool is_3x3(const SkMatrix44& toXYZD50) { |
| return 0.0f == toXYZD50.get(3, 0) && 0.0f == toXYZD50.get(3, 1) && 0.0f == toXYZD50.get(3, 2) && |
| 0.0f == toXYZD50.get(0, 3) && 0.0f == toXYZD50.get(1, 3) && 0.0f == toXYZD50.get(2, 3) && |
| 1.0f == toXYZD50.get(3, 3); |
| } |
| |
| sk_sp<SkData> SkICC::WriteToICC(const SkColorSpaceTransferFn& fn, const SkMatrix44& toXYZD50) { |
| if (!is_3x3(toXYZD50) || !is_valid_transfer_fn(fn)) { |
| return nullptr; |
| } |
| |
| SkAutoMalloc profile(kICCProfileSize); |
| uint8_t* ptr = (uint8_t*) profile.get(); |
| |
| // Write profile header |
| memcpy(ptr, kICCHeader, sizeof(kICCHeader)); |
| ptr += sizeof(kICCHeader); |
| |
| // Write tag table |
| memcpy(ptr, kICCTagTable, sizeof(kICCTagTable)); |
| ptr += sizeof(kICCTagTable); |
| |
| // Write profile description tag |
| memcpy(ptr, kDescriptionTagHeader, sizeof(kDescriptionTagHeader)); |
| ptr += sizeof(kDescriptionTagHeader); |
| memcpy(ptr, kDescriptionTagBody, sizeof(kDescriptionTagBody)); |
| ptr += sizeof(kDescriptionTagBody); |
| |
| // Write XYZ tags |
| write_xyz_tag((uint32_t*) ptr, toXYZD50, 0); |
| ptr += kTAG_XYZ_Bytes; |
| write_xyz_tag((uint32_t*) ptr, toXYZD50, 1); |
| ptr += kTAG_XYZ_Bytes; |
| write_xyz_tag((uint32_t*) ptr, toXYZD50, 2); |
| ptr += kTAG_XYZ_Bytes; |
| |
| // Write TRC tag |
| write_trc_tag((uint32_t*) ptr, fn); |
| ptr += kTAG_TRC_Bytes; |
| |
| // Write white point tag (must be D50) |
| memcpy(ptr, kWhitePointTag, sizeof(kWhitePointTag)); |
| ptr += sizeof(kWhitePointTag); |
| |
| // Write copyright tag |
| memcpy(ptr, kCopyrightTagHeader, sizeof(kCopyrightTagHeader)); |
| ptr += sizeof(kCopyrightTagHeader); |
| memcpy(ptr, kCopyrightTagBody, sizeof(kCopyrightTagBody)); |
| ptr += sizeof(kCopyrightTagBody); |
| |
| SkASSERT(kICCProfileSize == ptr - (uint8_t*) profile.get()); |
| return SkData::MakeFromMalloc(profile.release(), kICCProfileSize); |
| } |
