/* * 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 "SkColorSpace_Base.h" #include "SkColorSpace_XYZ.h" #include "SkColorSpacePriv.h" #include "SkEndian.h" #include "SkFixed.h" #include "SkICC.h" #include "SkICCPriv.h" SkICC::SkICC(sk_sp colorSpace) : fColorSpace(std::move(colorSpace)) {} sk_sp SkICC::Make(const void* ptr, size_t len) { sk_sp colorSpace = SkColorSpace::MakeICC(ptr, len); if (!colorSpace) { return nullptr; } return sk_sp(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); } /////////////////////////////////////////////////////////////////////////////////////////////////// // 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 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); }