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- /*
- * Copyright (c) 2022-2023, Nico Weber <thakis@chromium.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/Endian.h>
- #include <LibGfx/CIELAB.h>
- #include <LibGfx/CMYKBitmap.h>
- #include <LibGfx/ICC/BinaryFormat.h>
- #include <LibGfx/ICC/Profile.h>
- #include <LibGfx/ICC/Tags.h>
- #include <LibGfx/Matrix3x3.h>
- #include <math.h>
- #include <time.h>
- // V2 spec: https://color.org/specification/ICC.1-2001-04.pdf
- // V4 spec: https://color.org/specification/ICC.1-2022-05.pdf
- namespace Gfx::ICC {
- namespace {
- ErrorOr<DateTime> parse_date_time_number(DateTimeNumber const& date_time)
- {
- return DateTime {
- .year = date_time.year,
- .month = date_time.month,
- .day = date_time.day,
- .hours = date_time.hours,
- .minutes = date_time.minutes,
- .seconds = date_time.seconds,
- };
- }
- ErrorOr<u32> parse_size(ICCHeader const& header, ReadonlyBytes icc_bytes)
- {
- // ICC v4, 7.2.2 Profile size field
- // "The value in the profile size field shall be the exact size obtained by combining the profile header,
- // the tag table, and the tagged element data, including the pad bytes for the last tag."
- // Valid files have enough data for profile header and tag table entry count.
- if (header.profile_size < sizeof(ICCHeader) + sizeof(u32))
- return Error::from_string_literal("ICC::Profile: Profile size too small");
- if (header.profile_size > icc_bytes.size())
- return Error::from_string_literal("ICC::Profile: Profile size larger than input data");
- // ICC v4, 7.1.2:
- // "NOTE 1 This implies that the length is required to be a multiple of four."
- // The ICC v2 spec doesn't have this note. It instead has:
- // ICC v2, 6.2.2 Offset:
- // "All tag data is required to start on a 4-byte boundary"
- // And indeed, there are files in the wild where the last tag has a size that isn't a multiple of four,
- // resulting in an ICC file whose size isn't a multiple of four either.
- if (header.profile_version_major >= 4 && header.profile_size % 4 != 0)
- return Error::from_string_literal("ICC::Profile: Profile size not a multiple of four");
- return header.profile_size;
- }
- Optional<PreferredCMMType> parse_preferred_cmm_type(ICCHeader const& header)
- {
- // ICC v4, 7.2.3 Preferred CMM type field
- // "This field may be used to identify the preferred CMM to be used.
- // If used, it shall match a CMM type signature registered in the ICC Tag Registry"
- // https://www.color.org/signatures2.xalter currently links to
- // https://www.color.org/registry/signature/TagRegistry-2021-03.pdf, which contains
- // some CMM signatures.
- // This requirement is often honored in practice, but not always. For example,
- // JPEGs exported in Adobe Lightroom contain profiles that set this to 'Lino',
- // which is not present in the "CMM Signatures" table in that PDF.
- // "If no preferred CMM is identified, this field shall be set to zero (00000000h)."
- if (header.preferred_cmm_type == PreferredCMMType { 0 })
- return {};
- return header.preferred_cmm_type;
- }
- ErrorOr<Version> parse_version(ICCHeader const& header)
- {
- // ICC v4, 7.2.4 Profile version field
- if (header.profile_version_zero != 0)
- return Error::from_string_literal("ICC::Profile: Reserved version bytes not zero");
- return Version(header.profile_version_major, header.profile_version_minor_bugfix);
- }
- ErrorOr<DeviceClass> parse_device_class(ICCHeader const& header)
- {
- // ICC v4, 7.2.5 Profile/device class field
- switch (header.profile_device_class) {
- case DeviceClass::InputDevice:
- case DeviceClass::DisplayDevice:
- case DeviceClass::OutputDevice:
- case DeviceClass::DeviceLink:
- case DeviceClass::ColorSpace:
- case DeviceClass::Abstract:
- case DeviceClass::NamedColor:
- return header.profile_device_class;
- }
- return Error::from_string_literal("ICC::Profile: Invalid device class");
- }
- ErrorOr<ColorSpace> parse_color_space(ColorSpace color_space)
- {
- // ICC v4, Table 19 — Data colour space signatures
- switch (color_space) {
- case ColorSpace::nCIEXYZ:
- case ColorSpace::CIELAB:
- case ColorSpace::CIELUV:
- case ColorSpace::YCbCr:
- case ColorSpace::CIEYxy:
- case ColorSpace::RGB:
- case ColorSpace::Gray:
- case ColorSpace::HSV:
- case ColorSpace::HLS:
- case ColorSpace::CMYK:
- case ColorSpace::CMY:
- case ColorSpace::TwoColor:
- case ColorSpace::ThreeColor:
- case ColorSpace::FourColor:
- case ColorSpace::FiveColor:
- case ColorSpace::SixColor:
- case ColorSpace::SevenColor:
- case ColorSpace::EightColor:
- case ColorSpace::NineColor:
- case ColorSpace::TenColor:
- case ColorSpace::ElevenColor:
- case ColorSpace::TwelveColor:
- case ColorSpace::ThirteenColor:
- case ColorSpace::FourteenColor:
- case ColorSpace::FifteenColor:
- return color_space;
- }
- return Error::from_string_literal("ICC::Profile: Invalid color space");
- }
- ErrorOr<ColorSpace> parse_data_color_space(ICCHeader const& header)
- {
- // ICC v4, 7.2.6 Data colour space field
- return parse_color_space(header.data_color_space);
- }
- ErrorOr<ColorSpace> parse_connection_space(ICCHeader const& header)
- {
- // ICC v4, 7.2.7 PCS field
- // and Annex D
- auto space = TRY(parse_color_space(header.profile_connection_space));
- if (header.profile_device_class != DeviceClass::DeviceLink && (space != ColorSpace::PCSXYZ && space != ColorSpace::PCSLAB))
- return Error::from_string_literal("ICC::Profile: Invalid profile connection space: Non-PCS space on non-DeviceLink profile");
- return space;
- }
- ErrorOr<DateTime> parse_creation_date_time(ICCHeader const& header)
- {
- // ICC v4, 7.2.8 Date and time field
- return parse_date_time_number(header.profile_creation_time);
- }
- ErrorOr<void> parse_file_signature(ICCHeader const& header)
- {
- // ICC v4, 7.2.9 Profile file signature field
- if (header.profile_file_signature != ProfileFileSignature)
- return Error::from_string_literal("ICC::Profile: profile file signature not 'acsp'");
- return {};
- }
- ErrorOr<Optional<PrimaryPlatform>> parse_primary_platform(ICCHeader const& header)
- {
- // ICC v4, 7.2.10 Primary platform field
- // "If there is no primary platform identified, this field shall be set to zero (00000000h)."
- if (header.primary_platform == PrimaryPlatform { 0 })
- return OptionalNone {};
- switch (header.primary_platform) {
- case PrimaryPlatform::Apple:
- case PrimaryPlatform::Microsoft:
- case PrimaryPlatform::SiliconGraphics:
- case PrimaryPlatform::Sun:
- return header.primary_platform;
- }
- return Error::from_string_literal("ICC::Profile: Invalid primary platform");
- }
- Optional<DeviceManufacturer> parse_device_manufacturer(ICCHeader const& header)
- {
- // ICC v4, 7.2.12 Device manufacturer field
- // "This field may be used to identify a device manufacturer.
- // If used the signature shall match the signature contained in the appropriate section of the ICC signature registry found at www.color.org"
- // Device manufacturers can be looked up at https://www.color.org/signatureRegistry/index.xalter
- // For example: https://www.color.org/signatureRegistry/?entityEntry=APPL-4150504C
- // Some icc files use codes not in that registry. For example. D50_XYZ.icc from https://www.color.org/XYZprofiles.xalter
- // has its device manufacturer set to 'none', but https://www.color.org/signatureRegistry/?entityEntry=none-6E6F6E65 does not exist.
- // "If not used this field shall be set to zero (00000000h)."
- if (header.device_manufacturer == DeviceManufacturer { 0 })
- return {};
- return header.device_manufacturer;
- }
- Optional<DeviceModel> parse_device_model(ICCHeader const& header)
- {
- // ICC v4, 7.2.13 Device model field
- // "This field may be used to identify a device model.
- // If used the signature shall match the signature contained in the appropriate section of the ICC signature registry found at www.color.org"
- // Device models can be looked up at https://www.color.org/signatureRegistry/deviceRegistry/index.xalter
- // For example: https://www.color.org/signatureRegistry/deviceRegistry/?entityEntry=7FD8-37464438
- // Some icc files use codes not in that registry. For example. D50_XYZ.icc from https://www.color.org/XYZprofiles.xalter
- // has its device model set to 'none', but https://www.color.org/signatureRegistry/deviceRegistry?entityEntry=none-6E6F6E65 does not exist.
- // "If not used this field shall be set to zero (00000000h)."
- if (header.device_model == DeviceModel { 0 })
- return {};
- return header.device_model;
- }
- ErrorOr<DeviceAttributes> parse_device_attributes(ICCHeader const& header)
- {
- // ICC v4, 7.2.14 Device attributes field
- // "4 to 31": "Reserved (set to binary zero)"
- if (header.device_attributes & 0xffff'fff0)
- return Error::from_string_literal("ICC::Profile: Device attributes reserved bits not set to 0");
- return DeviceAttributes { header.device_attributes };
- }
- ErrorOr<RenderingIntent> parse_rendering_intent(ICCHeader const& header)
- {
- // ICC v4, 7.2.15 Rendering intent field
- switch (header.rendering_intent) {
- case RenderingIntent::Perceptual:
- case RenderingIntent::MediaRelativeColorimetric:
- case RenderingIntent::Saturation:
- case RenderingIntent::ICCAbsoluteColorimetric:
- return header.rendering_intent;
- }
- return Error::from_string_literal("ICC::Profile: Invalid rendering intent");
- }
- ErrorOr<XYZ> parse_pcs_illuminant(ICCHeader const& header)
- {
- // ICC v4, 7.2.16 PCS illuminant field
- XYZ xyz = (XYZ)header.pcs_illuminant;
- /// "The value, when rounded to four decimals, shall be X = 0,9642, Y = 1,0 and Z = 0,8249."
- if (round(xyz.X * 10'000) != 9'642 || round(xyz.Y * 10'000) != 10'000 || round(xyz.Z * 10'000) != 8'249)
- return Error::from_string_literal("ICC::Profile: Invalid pcs illuminant");
- return xyz;
- }
- Optional<Creator> parse_profile_creator(ICCHeader const& header)
- {
- // ICC v4, 7.2.17 Profile creator field
- // "This field may be used to identify the creator of the profile.
- // If used the signature should match the signature contained in the device manufacturer section of the ICC signature registry found at www.color.org."
- // This is not always true in practice.
- // For example, .icc files in /System/ColorSync/Profiles on macOS 12.6 set this to 'appl', which is a CMM signature, not a device signature (that one would be 'APPL').
- // "If not used this field shall be set to zero (00000000h)."
- if (header.profile_creator == Creator { 0 })
- return {};
- return header.profile_creator;
- }
- template<size_t N>
- bool all_bytes_are_zero(const u8 (&bytes)[N])
- {
- for (u8 byte : bytes) {
- if (byte != 0)
- return false;
- }
- return true;
- }
- ErrorOr<Optional<Crypto::Hash::MD5::DigestType>> parse_profile_id(ICCHeader const& header, ReadonlyBytes icc_bytes)
- {
- // ICC v4, 7.2.18 Profile ID field
- // "A profile ID field value of zero (00h) shall indicate that a profile ID has not been calculated."
- if (all_bytes_are_zero(header.profile_id))
- return OptionalNone {};
- Crypto::Hash::MD5::DigestType id;
- static_assert(sizeof(id.data) == sizeof(header.profile_id));
- memcpy(id.data, header.profile_id, sizeof(id.data));
- auto computed_id = Profile::compute_id(icc_bytes);
- if (id != computed_id)
- return Error::from_string_literal("ICC::Profile: Invalid profile id");
- return id;
- }
- ErrorOr<void> parse_reserved(ICCHeader const& header)
- {
- // ICC v4, 7.2.19 Reserved field
- // "This field of the profile header is reserved for future ICC definition and shall be set to zero."
- if (!all_bytes_are_zero(header.reserved))
- return Error::from_string_literal("ICC::Profile: Reserved header bytes are not zero");
- return {};
- }
- }
- URL device_manufacturer_url(DeviceManufacturer device_manufacturer)
- {
- return URL(ByteString::formatted("https://www.color.org/signatureRegistry/?entityEntry={:c}{:c}{:c}{:c}-{:08X}",
- device_manufacturer.c0(), device_manufacturer.c1(), device_manufacturer.c2(), device_manufacturer.c3(), device_manufacturer.value));
- }
- URL device_model_url(DeviceModel device_model)
- {
- return URL(ByteString::formatted("https://www.color.org/signatureRegistry/deviceRegistry/?entityEntry={:c}{:c}{:c}{:c}-{:08X}",
- device_model.c0(), device_model.c1(), device_model.c2(), device_model.c3(), device_model.value));
- }
- Flags::Flags() = default;
- Flags::Flags(u32 bits)
- : m_bits(bits)
- {
- }
- DeviceAttributes::DeviceAttributes() = default;
- DeviceAttributes::DeviceAttributes(u64 bits)
- : m_bits(bits)
- {
- }
- static ErrorOr<void> validate_date_time(DateTime const& date_time)
- {
- // Returns if a DateTime is valid per ICC V4, 4.2 dateTimeNumber.
- // In practice, some profiles contain invalid dates, but we should enforce this for data we write at least.
- // "Number of the month (1 to 12)"
- if (date_time.month < 1 || date_time.month > 12)
- return Error::from_string_literal("ICC::Profile: dateTimeNumber month out of bounds");
- // "Number of the day of the month (1 to 31)"
- if (date_time.day < 1 || date_time.day > 31)
- return Error::from_string_literal("ICC::Profile: dateTimeNumber day out of bounds");
- // "Number of hours (0 to 23)"
- if (date_time.hours > 23)
- return Error::from_string_literal("ICC::Profile: dateTimeNumber hours out of bounds");
- // "Number of minutes (0 to 59)"
- if (date_time.minutes > 59)
- return Error::from_string_literal("ICC::Profile: dateTimeNumber minutes out of bounds");
- // "Number of seconds (0 to 59)"
- // ICC profiles apparently can't be created during leap seconds (seconds would be 60 there, but the spec doesn't allow that).
- if (date_time.seconds > 59)
- return Error::from_string_literal("ICC::Profile: dateTimeNumber seconds out of bounds");
- return {};
- }
- ErrorOr<time_t> DateTime::to_time_t() const
- {
- TRY(validate_date_time(*this));
- struct tm tm = {};
- tm.tm_year = year - 1900;
- tm.tm_mon = month - 1;
- tm.tm_mday = day;
- tm.tm_hour = hours;
- tm.tm_min = minutes;
- tm.tm_sec = seconds;
- // timegm() doesn't read tm.tm_isdst, tm.tm_wday, and tm.tm_yday, no need to fill them in.
- time_t timestamp = timegm(&tm);
- if (timestamp == -1)
- return Error::from_string_literal("ICC::Profile: dateTimeNumber not representable as timestamp");
- return timestamp;
- }
- ErrorOr<DateTime> DateTime::from_time_t(time_t timestamp)
- {
- struct tm gmt_tm;
- if (gmtime_r(×tamp, &gmt_tm) == NULL)
- return Error::from_string_literal("ICC::Profile: timestamp not representable as DateTimeNumber");
- // FIXME: Range-check, using something like `TRY(Checked<u16>(x).try_value())`?
- DateTime result {
- .year = static_cast<u16>(gmt_tm.tm_year + 1900),
- .month = static_cast<u16>(gmt_tm.tm_mon + 1),
- .day = static_cast<u16>(gmt_tm.tm_mday),
- .hours = static_cast<u16>(gmt_tm.tm_hour),
- .minutes = static_cast<u16>(gmt_tm.tm_min),
- .seconds = static_cast<u16>(gmt_tm.tm_sec),
- };
- TRY(validate_date_time(result));
- return result;
- }
- static ErrorOr<ProfileHeader> read_header(ReadonlyBytes bytes)
- {
- if (bytes.size() < sizeof(ICCHeader))
- return Error::from_string_literal("ICC::Profile: Not enough data for header");
- ProfileHeader header;
- auto raw_header = *bit_cast<ICCHeader const*>(bytes.data());
- TRY(parse_file_signature(raw_header));
- header.on_disk_size = TRY(parse_size(raw_header, bytes));
- header.preferred_cmm_type = parse_preferred_cmm_type(raw_header);
- header.version = TRY(parse_version(raw_header));
- header.device_class = TRY(parse_device_class(raw_header));
- header.data_color_space = TRY(parse_data_color_space(raw_header));
- header.connection_space = TRY(parse_connection_space(raw_header));
- header.creation_timestamp = TRY(parse_creation_date_time(raw_header));
- header.primary_platform = TRY(parse_primary_platform(raw_header));
- header.flags = Flags { raw_header.profile_flags };
- header.device_manufacturer = parse_device_manufacturer(raw_header);
- header.device_model = parse_device_model(raw_header);
- header.device_attributes = TRY(parse_device_attributes(raw_header));
- header.rendering_intent = TRY(parse_rendering_intent(raw_header));
- header.pcs_illuminant = TRY(parse_pcs_illuminant(raw_header));
- header.creator = parse_profile_creator(raw_header);
- header.id = TRY(parse_profile_id(raw_header, bytes));
- TRY(parse_reserved(raw_header));
- return header;
- }
- static ErrorOr<NonnullRefPtr<TagData>> read_tag(ReadonlyBytes bytes, u32 offset_to_beginning_of_tag_data_element, u32 size_of_tag_data_element)
- {
- // "All tag data elements shall start on a 4-byte boundary (relative to the start of the profile data stream)"
- if (offset_to_beginning_of_tag_data_element % 4 != 0)
- return Error::from_string_literal("ICC::Profile: Tag data not aligned");
- if (static_cast<u64>(offset_to_beginning_of_tag_data_element) + size_of_tag_data_element > bytes.size())
- return Error::from_string_literal("ICC::Profile: Tag data out of bounds");
- auto tag_bytes = bytes.slice(offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- // ICC v4, 9 Tag definitions
- // ICC v4, 9.1 General
- // "All tags, including private tags, have as their first four bytes a tag signature to identify to profile readers
- // what kind of data is contained within a tag."
- if (tag_bytes.size() < sizeof(u32))
- return Error::from_string_literal("ICC::Profile: Not enough data for tag type");
- auto type = tag_type(tag_bytes);
- switch (type) {
- case ChromaticityTagData::Type:
- return ChromaticityTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case CicpTagData::Type:
- return CicpTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case CurveTagData::Type:
- return CurveTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case Lut16TagData::Type:
- return Lut16TagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case Lut8TagData::Type:
- return Lut8TagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case LutAToBTagData::Type:
- return LutAToBTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case LutBToATagData::Type:
- return LutBToATagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case MeasurementTagData::Type:
- return MeasurementTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case MultiLocalizedUnicodeTagData::Type:
- return MultiLocalizedUnicodeTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case NamedColor2TagData::Type:
- return NamedColor2TagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case ParametricCurveTagData::Type:
- return ParametricCurveTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case S15Fixed16ArrayTagData::Type:
- return S15Fixed16ArrayTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case SignatureTagData::Type:
- return SignatureTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case TextDescriptionTagData::Type:
- return TextDescriptionTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case TextTagData::Type:
- return TextTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case ViewingConditionsTagData::Type:
- return ViewingConditionsTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- case XYZTagData::Type:
- return XYZTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
- default:
- // FIXME: optionally ignore tags of unknown type
- return try_make_ref_counted<UnknownTagData>(offset_to_beginning_of_tag_data_element, size_of_tag_data_element, type);
- }
- }
- static ErrorOr<OrderedHashMap<TagSignature, NonnullRefPtr<TagData>>> read_tag_table(ReadonlyBytes bytes)
- {
- OrderedHashMap<TagSignature, NonnullRefPtr<TagData>> tag_table;
- // ICC v4, 7.3 Tag table
- // ICC v4, 7.3.1 Overview
- // "The tag table acts as a table of contents for the tags and an index into the tag data element in the profiles. It
- // shall consist of a 4-byte entry that contains a count of the number of tags in the table followed by a series of 12-
- // byte entries with one entry for each tag. The tag table therefore contains 4+12n bytes where n is the number of
- // tags contained in the profile. The entries for the tags within the table are not required to be in any particular
- // order nor are they required to match the sequence of tag data element within the profile.
- // Each 12-byte tag entry following the tag count shall consist of a 4-byte tag signature, a 4-byte offset to define
- // the beginning of the tag data element, and a 4-byte entry identifying the length of the tag data element in bytes.
- // [...]
- // The tag table shall define a contiguous sequence of unique tag elements, with no gaps between the last byte
- // of any tag data element referenced from the tag table (inclusive of any necessary additional pad bytes required
- // to reach a four-byte boundary) and the byte offset of the following tag element, or the end of the file.
- // Duplicate tag signatures shall not be included in the tag table.
- // Tag data elements shall not partially overlap, so there shall be no part of any tag data element that falls within
- // the range defined for another tag in the tag table."
- ReadonlyBytes tag_table_bytes = bytes.slice(sizeof(ICCHeader));
- if (tag_table_bytes.size() < sizeof(u32))
- return Error::from_string_literal("ICC::Profile: Not enough data for tag count");
- auto tag_count = *bit_cast<BigEndian<u32> const*>(tag_table_bytes.data());
- tag_table_bytes = tag_table_bytes.slice(sizeof(u32));
- if (tag_table_bytes.size() < tag_count * sizeof(TagTableEntry))
- return Error::from_string_literal("ICC::Profile: Not enough data for tag table entries");
- auto tag_table_entries = bit_cast<TagTableEntry const*>(tag_table_bytes.data());
- // "The tag table may contain multiple tags signatures that all reference the same tag data element offset, allowing
- // efficient reuse of tag data elements."
- HashMap<u32, NonnullRefPtr<TagData>> offset_to_tag_data;
- for (u32 i = 0; i < tag_count; ++i) {
- // FIXME: optionally ignore tags with unknown signature
- // Dedupe identical offset/sizes.
- NonnullRefPtr<TagData> tag_data = TRY(offset_to_tag_data.try_ensure(tag_table_entries[i].offset_to_beginning_of_tag_data_element, [&]() {
- return read_tag(bytes, tag_table_entries[i].offset_to_beginning_of_tag_data_element, tag_table_entries[i].size_of_tag_data_element);
- }));
- // "In such cases, both the offset and size of the tag data elements in the tag table shall be the same."
- if (tag_data->size() != tag_table_entries[i].size_of_tag_data_element)
- return Error::from_string_literal("ICC::Profile: two tags have same offset but different sizes");
- // "Duplicate tag signatures shall not be included in the tag table."
- if (TRY(tag_table.try_set(tag_table_entries[i].tag_signature, move(tag_data))) != AK::HashSetResult::InsertedNewEntry)
- return Error::from_string_literal("ICC::Profile: duplicate tag signature");
- }
- return tag_table;
- }
- static bool is_xCLR(ColorSpace color_space)
- {
- switch (color_space) {
- case ColorSpace::TwoColor:
- case ColorSpace::ThreeColor:
- case ColorSpace::FourColor:
- case ColorSpace::FiveColor:
- case ColorSpace::SixColor:
- case ColorSpace::SevenColor:
- case ColorSpace::EightColor:
- case ColorSpace::NineColor:
- case ColorSpace::TenColor:
- case ColorSpace::ElevenColor:
- case ColorSpace::TwelveColor:
- case ColorSpace::ThirteenColor:
- case ColorSpace::FourteenColor:
- case ColorSpace::FifteenColor:
- return true;
- default:
- return false;
- }
- }
- ErrorOr<void> Profile::check_required_tags()
- {
- // ICC v4, 8 Required tags
- // ICC v4, 8.2 Common requirements
- // "With the exception of DeviceLink profiles, all profiles shall contain the following tags:
- // - profileDescriptionTag (see 9.2.41);
- // - copyrightTag (see 9.2.21);
- // - mediaWhitePointTag (see 9.2.34);
- // - chromaticAdaptationTag, when the measurement data used to calculate the profile was specified for an
- // adopted white with a chromaticity different from that of the PCS adopted white (see 9.2.15).
- // NOTE A DeviceLink profile is not required to have either a mediaWhitePointTag or a chromaticAdaptationTag."
- // profileDescriptionTag, copyrightTag are required for DeviceLink too (see ICC v4, 8.6 DeviceLink profile).
- // profileDescriptionTag, copyrightTag, mediaWhitePointTag are required in ICC v2 as well.
- // chromaticAdaptationTag isn't required in v2 profiles as far as I can tell.
- if (!m_tag_table.contains(profileDescriptionTag))
- return Error::from_string_literal("ICC::Profile: required profileDescriptionTag is missing");
- if (!m_tag_table.contains(copyrightTag))
- return Error::from_string_literal("ICC::Profile: required copyrightTag is missing");
- if (device_class() != DeviceClass::DeviceLink) {
- if (!m_tag_table.contains(mediaWhitePointTag))
- return Error::from_string_literal("ICC::Profile: required mediaWhitePointTag is missing");
- // FIXME: Check for chromaticAdaptationTag after figuring out when exactly it needs to be present.
- }
- auto has_tag = [&](auto& tag) { return m_tag_table.contains(tag); };
- auto has_all_tags = [&]<class T>(T tags) { return all_of(tags, has_tag); };
- switch (device_class()) {
- case DeviceClass::InputDevice: {
- // ICC v4, 8.3 Input profiles
- // "8.3.1 General
- // Input profiles are generally used with devices such as scanners and digital cameras. The types of profiles
- // available for use as Input profiles are N-component LUT-based, Three-component matrix-based, and
- // monochrome.
- // 8.3.2 N-component LUT-based Input profiles
- // In addition to the tags listed in 8.2 an N-component LUT-based Input profile shall contain the following tag:
- // - AToB0Tag (see 9.2.1).
- // 8.3.3 Three-component matrix-based Input profiles
- // In addition to the tags listed in 8.2, a three-component matrix-based Input profile shall contain the following tags:
- // - redMatrixColumnTag (see 9.2.44);
- // - greenMatrixColumnTag (see 9.2.30);
- // - blueMatrixColumnTag (see 9.2.4);
- // - redTRCTag (see 9.2.45);
- // - greenTRCTag (see 9.2.31);
- // - blueTRCTag (see 9.2.5).
- // [...] Only the PCSXYZ encoding can be used with matrix/TRC models.
- // 8.3.4 Monochrome Input profiles
- // In addition to the tags listed in 8.2, a monochrome Input profile shall contain the following tag:
- // - grayTRCTag (see 9.2.29)."
- bool has_n_component_lut_based_tags = has_tag(AToB0Tag);
- bool has_three_component_matrix_based_tags = has_all_tags(Array { redMatrixColumnTag, greenMatrixColumnTag, blueMatrixColumnTag, redTRCTag, greenTRCTag, blueTRCTag });
- bool has_monochrome_tags = has_tag(grayTRCTag);
- if (!has_n_component_lut_based_tags && !has_three_component_matrix_based_tags && !has_monochrome_tags)
- return Error::from_string_literal("ICC::Profile: InputDevice required tags are missing");
- if (!has_n_component_lut_based_tags && has_three_component_matrix_based_tags && connection_space() != ColorSpace::PCSXYZ)
- return Error::from_string_literal("ICC::Profile: InputDevice three-component matrix-based profile must use PCSXYZ");
- break;
- }
- case DeviceClass::DisplayDevice: {
- // ICC v4, 8.4 Display profiles
- // "8.4.1 General
- // This class of profiles represents display devices such as monitors. The types of profiles available for use as
- // Display profiles are N-component LUT-based, Three-component matrix-based, and monochrome.
- // 8.4.2 N-Component LUT-based Display profiles
- // In addition to the tags listed in 8.2 an N-component LUT-based Input profile shall contain the following tags:
- // - AToB0Tag (see 9.2.1);
- // - BToA0Tag (see 9.2.6).
- // 8.4.3 Three-component matrix-based Display profiles
- // In addition to the tags listed in 8.2, a three-component matrix-based Display profile shall contain the following
- // tags:
- // - redMatrixColumnTag (see 9.2.44);
- // - greenMatrixColumnTag (see 9.2.30);
- // - blueMatrixColumnTag (see 9.2.4);
- // - redTRCTag (see 9.2.45);
- // - greenTRCTag (see 9.2.31);
- // - blueTRCTag (see 9.2.5).
- // [...] Only the PCSXYZ encoding can be used with matrix/TRC models.
- // 8.4.4 Monochrome Display profiles
- // In addition to the tags listed in 8.2 a monochrome Display profile shall contain the following tag:
- // - grayTRCTag (see 9.2.29)."
- bool has_n_component_lut_based_tags = has_all_tags(Array { AToB0Tag, BToA0Tag });
- bool has_three_component_matrix_based_tags = has_all_tags(Array { redMatrixColumnTag, greenMatrixColumnTag, blueMatrixColumnTag, redTRCTag, greenTRCTag, blueTRCTag });
- bool has_monochrome_tags = has_tag(grayTRCTag);
- if (!has_n_component_lut_based_tags && !has_three_component_matrix_based_tags && !has_monochrome_tags)
- return Error::from_string_literal("ICC::Profile: DisplayDevice required tags are missing");
- if (!has_n_component_lut_based_tags && has_three_component_matrix_based_tags && connection_space() != ColorSpace::PCSXYZ)
- return Error::from_string_literal("ICC::Profile: DisplayDevice three-component matrix-based profile must use PCSXYZ");
- break;
- }
- case DeviceClass::OutputDevice: {
- // ICC v4, 8.5 Output profiles
- // "8.5.1 General
- // Output profiles are used to support devices such as printers and film recorders. The types of profiles available
- // for use as Output profiles are N-component LUT-based and Monochrome.
- // 8.5.2 N-component LUT-based Output profiles
- // In addition to the tags listed in 8.2 an N-component LUT-based Output profile shall contain the following tags:
- // - AToB0Tag (see 9.2.1);
- // - AToB1Tag (see 9.2.2);
- // - AToB2Tag (see 9.2.3);
- // - BToA0Tag (see 9.2.6);
- // - BToA1Tag (see 9.2.7);
- // - BToA2Tag (see 9.2.8);
- // - gamutTag (see 9.2.28);
- // - colorantTableTag (see 9.2.18), for the xCLR colour spaces (see 7.2.6)
- // 8.5.3 Monochrome Output profiles
- // In addition to the tags listed in 8.2 a monochrome Output profile shall contain the following tag:
- // - grayTRCTag (see 9.2.29)."
- // The colorantTableTag requirement is new in v4.
- Vector<TagSignature, 8> required_n_component_lut_based_tags = { AToB0Tag, AToB1Tag, AToB2Tag, BToA0Tag, BToA1Tag, BToA2Tag, gamutTag };
- if (is_v4() && is_xCLR(connection_space()))
- required_n_component_lut_based_tags.append(colorantTableTag);
- bool has_n_component_lut_based_tags = has_all_tags(required_n_component_lut_based_tags);
- bool has_monochrome_tags = has_tag(grayTRCTag);
- if (!has_n_component_lut_based_tags && !has_monochrome_tags)
- return Error::from_string_literal("ICC::Profile: OutputDevice required tags are missing");
- break;
- }
- case DeviceClass::DeviceLink: {
- // ICC v4, 8.6 DeviceLink profile
- // "A DeviceLink profile shall contain the following tags:
- // - profileDescriptionTag (see 9.2.41);
- // - copyrightTag (see 9.2.21);
- // - profileSequenceDescTag (see 9.2.42);
- // - AToB0Tag (see 9.2.1);
- // - colorantTableTag (see 9.2.18) which is required only if the data colour space field is xCLR, where x is
- // hexadecimal 2 to F (see 7.2.6);
- // - colorantTableOutTag (see 9.2.19), required only if the PCS field is xCLR, where x is hexadecimal 2 to F
- // (see 7.2.6)"
- // profileDescriptionTag and copyrightTag are already checked above, in the code for section 8.2.
- Vector<TagSignature, 4> required_tags = { profileSequenceDescTag, AToB0Tag };
- if (is_v4() && is_xCLR(connection_space())) { // This requirement is new in v4.
- required_tags.append(colorantTableTag);
- required_tags.append(colorantTableOutTag);
- }
- if (!has_all_tags(required_tags))
- return Error::from_string_literal("ICC::Profile: DeviceLink required tags are missing");
- // "The data colour space field (see 7.2.6) in the DeviceLink profile will be the same as the data colour space field
- // of the first profile in the sequence used to construct the device link. The PCS field (see 7.2.7) will be the same
- // as the data colour space field of the last profile in the sequence."
- // FIXME: Check that if profileSequenceDescType parsing is implemented.
- break;
- }
- case DeviceClass::ColorSpace:
- // ICC v4, 8.7 ColorSpace profile
- // "In addition to the tags listed in 8.2, a ColorSpace profile shall contain the following tags:
- // - BToA0Tag (see 9.2.6);
- // - AToB0Tag (see 9.2.1).
- // [...] ColorSpace profiles may be embedded in images."
- if (!has_all_tags(Array { AToB0Tag, BToA0Tag }))
- return Error::from_string_literal("ICC::Profile: ColorSpace required tags are missing");
- break;
- case DeviceClass::Abstract:
- // ICC v4, 8.8 Abstract profile
- // "In addition to the tags listed in 8.2, an Abstract profile shall contain the following tag:
- // - AToB0Tag (see 9.2.1).
- // [...] Abstract profiles cannot be embedded in images."
- if (!has_tag(AToB0Tag))
- return Error::from_string_literal("ICC::Profile: Abstract required AToB0Tag is missing");
- break;
- case DeviceClass::NamedColor:
- // ICC v4, 8.9 NamedColor profile
- // "In addition to the tags listed in 8.2, a NamedColor profile shall contain the following tag:
- // - namedColor2Tag (see 9.2.35)."
- if (!has_tag(namedColor2Tag))
- return Error::from_string_literal("ICC::Profile: NamedColor required namedColor2Tag is missing");
- break;
- }
- m_cached_has_any_a_to_b_tag = has_tag(AToB0Tag) || has_tag(AToB1Tag) || has_tag(AToB2Tag);
- m_cached_has_a_to_b0_tag = has_tag(AToB0Tag);
- m_cached_has_any_b_to_a_tag = has_tag(BToA0Tag) || has_tag(BToA1Tag) || has_tag(BToA2Tag);
- m_cached_has_b_to_a0_tag = has_tag(BToA0Tag);
- m_cached_has_all_rgb_matrix_tags = has_all_tags(Array { redMatrixColumnTag, greenMatrixColumnTag, blueMatrixColumnTag, redTRCTag, greenTRCTag, blueTRCTag });
- return {};
- }
- ErrorOr<void> Profile::check_tag_types()
- {
- // This uses m_tag_table.get() even for tags that are guaranteed to exist after check_required_tags()
- // so that the two functions can be called in either order.
- // Profile ID of /System/Library/ColorSync/Profiles/ITU-2020.icc on macOS 13.1.
- static constexpr Crypto::Hash::MD5::DigestType apple_itu_2020_id = { 0x57, 0x0b, 0x1b, 0x76, 0xc6, 0xa0, 0x50, 0xaa, 0x9f, 0x6c, 0x53, 0x8d, 0xbe, 0x2d, 0x3e, 0xf0 };
- // Profile ID of the "Display P3" profiles embedded in the images on https://webkit.org/blog-files/color-gamut/comparison.html
- // (The macOS 13.1 /System/Library/ColorSync/Profiles/Display\ P3.icc file no longer has this quirk.)
- static constexpr Crypto::Hash::MD5::DigestType apple_p3_2015_id = { 0xe5, 0xbb, 0x0e, 0x98, 0x67, 0xbd, 0x46, 0xcd, 0x4b, 0xbe, 0x44, 0x6e, 0xbd, 0x1b, 0x75, 0x98 };
- // Profile ID of the "Display P3" profile in object 881 in https://fredrikbk.com/publications/copy-and-patch.pdf
- // (The macOS 13.1 /System/Library/ColorSync/Profiles/Display\ P3.icc file no longer has this quirk.)
- static constexpr Crypto::Hash::MD5::DigestType apple_p3_2017_id = { 0xca, 0x1a, 0x95, 0x82, 0x25, 0x7f, 0x10, 0x4d, 0x38, 0x99, 0x13, 0xd5, 0xd1, 0xea, 0x15, 0x82 };
- auto has_type = [&](auto tag, std::initializer_list<TagTypeSignature> types, std::initializer_list<TagTypeSignature> v4_types) {
- if (auto type = m_tag_table.get(tag); type.has_value()) {
- auto type_matches = [&](auto wanted_type) { return type.value()->type() == wanted_type; };
- return any_of(types, type_matches) || (is_v4() && any_of(v4_types, type_matches));
- }
- return true;
- };
- // ICC v4, 9.2.1 AToB0Tag
- // "Permitted tag types: lut8Type or lut16Type or lutAToBType"
- // ICC v2, 6.4.1 AToB0Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(AToB0Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutAToBTagData::Type }))
- return Error::from_string_literal("ICC::Profile: AToB0Tag has unexpected type");
- // ICC v4, 9.2.2 AToB1Tag
- // "Permitted tag types: lut8Type or lut16Type or lutAToBType"
- // ICC v2, 6.4.2 AToB1Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(AToB1Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutAToBTagData::Type }))
- return Error::from_string_literal("ICC::Profile: AToB1Tag has unexpected type");
- // ICC v4, 9.2.3 AToB2Tag
- // "Permitted tag types: lut8Type or lut16Type or lutAToBType"
- // ICC v2, 6.4.3 AToB2Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(AToB2Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutAToBTagData::Type }))
- return Error::from_string_literal("ICC::Profile: AToB2Tag has unexpected type");
- // ICC v4, 9.2.4 blueMatrixColumnTag
- // "Permitted tag types: XYZType
- // This tag contains the third column in the matrix used in matrix/TRC transforms."
- // (Called blueColorantTag in the v2 spec, otherwise identical there.)
- if (auto type = m_tag_table.get(blueMatrixColumnTag); type.has_value()) {
- if (type.value()->type() != XYZTagData::Type)
- return Error::from_string_literal("ICC::Profile: blueMatrixColumnTag has unexpected type");
- if (static_cast<XYZTagData const&>(*type.value()).xyzs().size() != 1)
- return Error::from_string_literal("ICC::Profile: blueMatrixColumnTag has unexpected size");
- }
- // ICC v4, 9.2.5 blueTRCTag
- // "Permitted tag types: curveType or parametricCurveType"
- // ICC v2, 6.4.5 blueTRCTag
- // "Tag Type: curveType"
- if (!has_type(blueTRCTag, { CurveTagData::Type }, { ParametricCurveTagData::Type }))
- return Error::from_string_literal("ICC::Profile: blueTRCTag has unexpected type");
- // ICC v4, 9.2.6 BToA0Tag
- // "Permitted tag types: lut8Type or lut16Type or lutBToAType"
- // ICC v2, 6.4.6 BToA0Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(BToA0Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutBToATagData::Type }))
- return Error::from_string_literal("ICC::Profile: BToA0Tag has unexpected type");
- // ICC v4, 9.2.7 BToA1Tag
- // "Permitted tag types: lut8Type or lut16Type or lutBToAType"
- // ICC v2, 6.4.7 BToA1Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(BToA1Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutBToATagData::Type }))
- return Error::from_string_literal("ICC::Profile: BToA1Tag has unexpected type");
- // ICC v4, 9.2.8 BToA2Tag
- // "Permitted tag types: lut8Type or lut16Type or lutBToAType"
- // ICC v2, 6.4.8 BToA2Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(BToA2Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutBToATagData::Type }))
- return Error::from_string_literal("ICC::Profile: BToA2Tag has unexpected type");
- // ICC v4, 9.2.9 BToD0Tag
- // "Permitted tag types: multiProcessElementsType"
- // FIXME
- // ICC v4, 9.2.10 BToD1Tag
- // "Permitted tag types: multiProcessElementsType"
- // FIXME
- // ICC v4, 9.2.11 BToD2Tag
- // "Permitted tag types: multiProcessElementsType"
- // FIXME
- // ICC v4, 9.2.12 BToD3Tag
- // "Permitted tag types: multiProcessElementsType"
- // FIXME
- // ICC v4, 9.2.13 calibrationDateTimeTag
- // "Permitted tag types: dateTimeType"
- // FIXME
- // ICC v4, 9.2.14 charTargetTag
- // "Permitted tag types: textType"
- if (!has_type(charTargetTag, { TextTagData::Type }, {}))
- return Error::from_string_literal("ICC::Profile: charTargetTag has unexpected type");
- // ICC v4, 9.2.15 chromaticAdaptationTag
- // "Permitted tag types: s15Fixed16ArrayType [...]
- // Such a 3 x 3 chromatic adaptation matrix is organized as a 9-element array"
- if (auto type = m_tag_table.get(chromaticAdaptationTag); type.has_value()) {
- if (type.value()->type() != S15Fixed16ArrayTagData::Type)
- return Error::from_string_literal("ICC::Profile: chromaticAdaptationTag has unexpected type");
- if (static_cast<S15Fixed16ArrayTagData const&>(*type.value()).values().size() != 9)
- return Error::from_string_literal("ICC::Profile: chromaticAdaptationTag has unexpected size");
- }
- // ICC v4, 9.2.16 chromaticityTag
- // "Permitted tag types: chromaticityType"
- if (!has_type(chromaticityTag, { ChromaticityTagData::Type }, {}))
- return Error::from_string_literal("ICC::Profile: ChromaticityTagData has unexpected type");
- // ICC v4, 9.2.17 cicpTag
- // "Permitted tag types: cicpType"
- if (auto type = m_tag_table.get(cicpTag); type.has_value()) {
- if (type.value()->type() != CicpTagData::Type)
- return Error::from_string_literal("ICC::Profile: cicpTag has unexpected type");
- // "The colour encoding specified by the CICP tag content shall be equivalent to the data colour space encoding
- // represented by this ICC profile.
- // NOTE The ICC colour transform cannot match every possible rendering of a CICP colour encoding."
- // FIXME: Figure out what that means and check for it.
- // "This tag may be present when the data colour space in the profile header is RGB, YCbCr, or XYZ, and the
- // profile class in the profile header is Input or Display. The tag shall not be present for other data colour spaces
- // or profile classes indicated in the profile header."
- bool is_color_space_allowed = data_color_space() == ColorSpace::RGB || data_color_space() == ColorSpace::YCbCr || data_color_space() == ColorSpace::nCIEXYZ;
- bool is_profile_class_allowed = device_class() == DeviceClass::InputDevice || device_class() == DeviceClass::DisplayDevice;
- bool cicp_is_allowed = is_color_space_allowed && is_profile_class_allowed;
- if (!cicp_is_allowed)
- return Error::from_string_literal("ICC::Profile: cicpTag present but not allowed");
- }
- // ICC v4, 9.2.18 colorantOrderTag
- // "Permitted tag types: colorantOrderType"
- // FIXME
- // ICC v4, 9.2.19 colorantTableTag
- // "Permitted tag types: colorantTableType"
- // FIXME
- // ICC v4, 9.2.20 colorantTableOutTag
- // "Permitted tag types: colorantTableType"
- // FIXME
- // ICC v4, 9.2.21 colorimetricIntentImageStateTag
- // "Permitted tag types: signatureType"
- if (!has_type(colorimetricIntentImageStateTag, { SignatureTagData::Type }, {}))
- return Error::from_string_literal("ICC::Profile: colorimetricIntentImageStateTag has unexpected type");
- // ICC v4, 9.2.22 copyrightTag
- // "Permitted tag types: multiLocalizedUnicodeType"
- // ICC v2, 6.4.13 copyrightTag
- // "Tag Type: textType"
- if (auto type = m_tag_table.get(copyrightTag); type.has_value()) {
- // The v4 spec requires multiLocalizedUnicodeType for this, but I'm aware of a single file
- // that still uses the v2 'text' type here: /System/Library/ColorSync/Profiles/ITU-2020.icc on macOS 13.1.
- // https://openradar.appspot.com/radar?id=5529765549178880
- bool has_v2_cprt_type_in_v4_file_quirk = id() == apple_itu_2020_id || id() == apple_p3_2015_id || id() == apple_p3_2017_id;
- if (is_v4() && type.value()->type() != MultiLocalizedUnicodeTagData::Type && (!has_v2_cprt_type_in_v4_file_quirk || type.value()->type() != TextTagData::Type))
- return Error::from_string_literal("ICC::Profile: copyrightTag has unexpected v4 type");
- if (is_v2() && type.value()->type() != TextTagData::Type)
- return Error::from_string_literal("ICC::Profile: copyrightTag has unexpected v2 type");
- }
- // ICC v4, 9.2.23 deviceMfgDescTag
- // "Permitted tag types: multiLocalizedUnicodeType"
- // ICC v2, 6.4.15 deviceMfgDescTag
- // "Tag Type: textDescriptionType"
- if (auto type = m_tag_table.get(deviceMfgDescTag); type.has_value()) {
- if (is_v4() && type.value()->type() != MultiLocalizedUnicodeTagData::Type)
- return Error::from_string_literal("ICC::Profile: deviceMfgDescTag has unexpected v4 type");
- if (is_v2() && type.value()->type() != TextDescriptionTagData::Type)
- return Error::from_string_literal("ICC::Profile: deviceMfgDescTag has unexpected v2 type");
- }
- // ICC v4, 9.2.24 deviceModelDescTag
- // "Permitted tag types: multiLocalizedUnicodeType"
- // ICC v2, 6.4.16 deviceModelDescTag
- // "Tag Type: textDescriptionType"
- if (auto type = m_tag_table.get(deviceModelDescTag); type.has_value()) {
- if (is_v4() && type.value()->type() != MultiLocalizedUnicodeTagData::Type)
- return Error::from_string_literal("ICC::Profile: deviceModelDescTag has unexpected v4 type");
- if (is_v2() && type.value()->type() != TextDescriptionTagData::Type)
- return Error::from_string_literal("ICC::Profile: deviceModelDescTag has unexpected v2 type");
- }
- // ICC v4, 9.2.25 DToB0Tag
- // "Permitted tag types: multiProcessElementsType"
- // FIXME
- // ICC v4, 9.2.26 DToB1Tag
- // "Permitted tag types: multiProcessElementsType"
- // FIXME
- // ICC v4, 9.2.27 DToB2Tag
- // "Permitted tag types: multiProcessElementsType"
- // FIXME
- // ICC v4, 9.2.28 DToB3Tag
- // "Permitted tag types: multiProcessElementsType"
- // FIXME
- // ICC v4, 9.2.29 gamutTag
- // "Permitted tag types: lut8Type or lut16Type or lutBToAType"
- // ICC v2, 6.4.18 gamutTag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(gamutTag, { Lut8TagData::Type, Lut16TagData::Type }, { LutBToATagData::Type }))
- return Error::from_string_literal("ICC::Profile: gamutTag has unexpected type");
- // ICC v4, 9.2.30 grayTRCTag
- // "Permitted tag types: curveType or parametricCurveType"
- // ICC v2, 6.4.19 grayTRCTag
- // "Tag Type: curveType"
- if (!has_type(grayTRCTag, { CurveTagData::Type }, { ParametricCurveTagData::Type }))
- return Error::from_string_literal("ICC::Profile: grayTRCTag has unexpected type");
- // ICC v4, 9.2.31 greenMatrixColumnTag
- // "Permitted tag types: XYZType
- // This tag contains the second column in the matrix, which is used in matrix/TRC transforms."
- // (Called greenColorantTag in the v2 spec, otherwise identical there.)
- if (auto type = m_tag_table.get(greenMatrixColumnTag); type.has_value()) {
- if (type.value()->type() != XYZTagData::Type)
- return Error::from_string_literal("ICC::Profile: greenMatrixColumnTag has unexpected type");
- if (static_cast<XYZTagData const&>(*type.value()).xyzs().size() != 1)
- return Error::from_string_literal("ICC::Profile: greenMatrixColumnTag has unexpected size");
- }
- // ICC v4, 9.2.32 greenTRCTag
- // "Permitted tag types: curveType or parametricCurveType"
- // ICC v2, 6.4.21 greenTRCTag
- // "Tag Type: curveType"
- if (!has_type(greenTRCTag, { CurveTagData::Type }, { ParametricCurveTagData::Type }))
- return Error::from_string_literal("ICC::Profile: greenTRCTag has unexpected type");
- // ICC v4, 9.2.33 luminanceTag
- // "Permitted tag types: XYZType"
- // This tag contains the absolute luminance of emissive devices in candelas per square metre as described by the
- // Y channel.
- // NOTE The X and Z values are set to zero."
- // ICC v2, 6.4.22 luminanceTag
- // "Absolute luminance of emissive devices in candelas per square meter as described by the Y channel. The
- // X and Z channels are ignored in all cases."
- if (auto type = m_tag_table.get(luminanceTag); type.has_value()) {
- if (type.value()->type() != XYZTagData::Type)
- return Error::from_string_literal("ICC::Profile: luminanceTag has unexpected type");
- auto& xyz_type = static_cast<XYZTagData const&>(*type.value());
- if (xyz_type.xyzs().size() != 1)
- return Error::from_string_literal("ICC::Profile: luminanceTag has unexpected size");
- if (is_v4() && xyz_type.xyzs()[0].X != 0)
- return Error::from_string_literal("ICC::Profile: luminanceTag.x unexpectedly not 0");
- if (is_v4() && xyz_type.xyzs()[0].Z != 0)
- return Error::from_string_literal("ICC::Profile: luminanceTag.z unexpectedly not 0");
- }
- // ICC v4, 9.2.34 measurementTag
- // "Permitted tag types: measurementType"
- if (!has_type(measurementTag, { MeasurementTagData::Type }, {}))
- return Error::from_string_literal("ICC::Profile: measurementTag has unexpected type");
- // ICC v4, 9.2.35 metadataTag
- // "Permitted tag types: dictType"
- // FIXME
- // ICC v4, 9.2.36 mediaWhitePointTag
- // "Permitted tag types: XYZType
- // This tag, which is used for generating the ICC-absolute colorimetric intent, specifies the chromatically adapted
- // nCIEXYZ tristimulus values of the media white point. When the measurement data used to create the profile
- // were specified relative to an adopted white with a chromaticity different from that of the PCS adopted white, the
- // media white point nCIEXYZ values shall be adapted to be relative to the PCS adopted white chromaticity using
- // the chromaticAdaptationTag matrix, before recording in the tag. For capture devices, the media white point is
- // the encoding maximum white for the capture encoding. For displays, the values specified shall be those of the
- // PCS illuminant as defined in 7.2.16.
- // See Clause 6 and Annex A for a more complete description of the use of the media white point."
- // ICC v2, 6.4.25 mediaWhitePointTag
- // "This tag specifies the media white point and is used for generating ICC-absolute colorimetric intent. See
- // Annex A for a more complete description of its use."
- if (auto type = m_tag_table.get(mediaWhitePointTag); type.has_value()) {
- if (type.value()->type() != XYZTagData::Type)
- return Error::from_string_literal("ICC::Profile: mediaWhitePointTag has unexpected type");
- auto& xyz_type = static_cast<XYZTagData const&>(*type.value());
- if (xyz_type.xyzs().size() != 1)
- return Error::from_string_literal("ICC::Profile: mediaWhitePointTag has unexpected size");
- // V4 requires "For displays, the values specified shall be those of the PCS illuminant".
- // But in practice that's not always true. For example, on macOS 13.1, '/System/Library/ColorSync/Profiles/DCI(P3) RGB.icc'
- // has these values in the header: 0000F6D6 00010000 0000D32D
- // but these values in the tag: 0000F6D5 00010000 0000D32C
- // These are close, but not equal.
- // FIXME: File bug for these, and add id-based quirk instead.
- // if (is_v4() && device_class() == DeviceClass::DisplayDevice && xyz_type.xyzs()[0] != pcs_illuminant())
- // return Error::from_string_literal("ICC::Profile: mediaWhitePointTag for displays should be equal to PCS illuminant");
- }
- // ICC v4, 9.2.37 namedColor2Tag
- // "Permitted tag types: namedColor2Type"
- if (auto type = m_tag_table.get(namedColor2Tag); type.has_value()) {
- if (type.value()->type() != NamedColor2TagData::Type)
- return Error::from_string_literal("ICC::Profile: namedColor2Tag has unexpected type");
- // ICC v4, 10.17 namedColor2Type
- // "The device representation corresponds to the header’s “data colour space” field.
- // This representation should be consistent with the “number of device coordinates” field in the namedColor2Type.
- // If this field is 0, device coordinates are not provided."
- if (auto number_of_device_coordinates = static_cast<NamedColor2TagData const&>(*type.value()).number_of_device_coordinates();
- number_of_device_coordinates != 0 && number_of_device_coordinates != number_of_components_in_color_space(data_color_space())) {
- return Error::from_string_literal("ICC::Profile: namedColor2Tag number of device coordinates inconsistent with data color space");
- }
- }
- // ICC v4, 9.2.38 outputResponseTag
- // "Permitted tag types: responseCurveSet16Type"
- // FIXME
- // ICC v4, 9.2.39 perceptualRenderingIntentGamutTag
- // "Permitted tag types: signatureType"
- if (!has_type(perceptualRenderingIntentGamutTag, { SignatureTagData::Type }, {}))
- return Error::from_string_literal("ICC::Profile: perceptualRenderingIntentGamutTag has unexpected type");
- // ICC v4, 9.2.40 preview0Tag
- // "Permitted tag types: lut8Type or lut16Type or lutAToBType or lutBToAType"
- // ICC v2, 6.4.29 preview0Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(preview0Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutBToATagData::Type, LutBToATagData::Type }))
- return Error::from_string_literal("ICC::Profile: preview0Tag has unexpected type");
- // ICC v4, 9.2.41 preview1Tag
- // "Permitted tag types: lut8Type or lut16Type or lutBToAType"
- // ICC v2, 6.4.30 preview1Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(preview1Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutBToATagData::Type }))
- return Error::from_string_literal("ICC::Profile: preview1Tag has unexpected type");
- // ICC v4, 9.2.42 preview2Tag
- // "Permitted tag types: lut8Type or lut16Type or lutBToAType"
- // ICC v2, 6.4.31 preview2Tag
- // "Tag Type: lut8Type or lut16Type"
- if (!has_type(preview2Tag, { Lut8TagData::Type, Lut16TagData::Type }, { LutBToATagData::Type }))
- return Error::from_string_literal("ICC::Profile: preview2Tag has unexpected type");
- // ICC v4, 9.2.43 profileDescriptionTag
- // "Permitted tag types: multiLocalizedUnicodeType"
- // ICC v2, 6.4.32 profileDescriptionTag
- // "Tag Type: textDescriptionType"
- if (auto type = m_tag_table.get(profileDescriptionTag); type.has_value()) {
- // The v4 spec requires multiLocalizedUnicodeType for this, but I'm aware of a single file
- // that still uses the v2 'desc' type here: /System/Library/ColorSync/Profiles/ITU-2020.icc on macOS 13.1.
- // https://openradar.appspot.com/radar?id=5529765549178880
- bool has_v2_desc_type_in_v4_file_quirk = id() == apple_itu_2020_id || id() == apple_p3_2015_id || id() == apple_p3_2017_id;
- if (is_v4() && type.value()->type() != MultiLocalizedUnicodeTagData::Type && (!has_v2_desc_type_in_v4_file_quirk || type.value()->type() != TextDescriptionTagData::Type))
- return Error::from_string_literal("ICC::Profile: profileDescriptionTag has unexpected v4 type");
- if (is_v2() && type.value()->type() != TextDescriptionTagData::Type)
- return Error::from_string_literal("ICC::Profile: profileDescriptionTag has unexpected v2 type");
- }
- // ICC v4, 9.2.44 profileSequenceDescTag
- // "Permitted tag types: profileSequenceDescType"
- // FIXME
- // ICC v4, 9.2.45 profileSequenceIdentifierTag
- // "Permitted tag types: profileSequenceIdentifierType"
- // FIXME
- // ICC v4, 9.2.46 redMatrixColumnTag
- // "Permitted tag types: XYZType
- // This tag contains the first column in the matrix, which is used in matrix/TRC transforms."
- // (Called redColorantTag in the v2 spec, otherwise identical there.)
- if (auto type = m_tag_table.get(redMatrixColumnTag); type.has_value()) {
- if (type.value()->type() != XYZTagData::Type)
- return Error::from_string_literal("ICC::Profile: redMatrixColumnTag has unexpected type");
- if (static_cast<XYZTagData const&>(*type.value()).xyzs().size() != 1)
- return Error::from_string_literal("ICC::Profile: redMatrixColumnTag has unexpected size");
- }
- // ICC v4, 9.2.47 redTRCTag
- // "Permitted tag types: curveType or parametricCurveType"
- // ICC v2, 6.4.41 redTRCTag
- // "Tag Type: curveType"
- if (!has_type(redTRCTag, { CurveTagData::Type }, { ParametricCurveTagData::Type }))
- return Error::from_string_literal("ICC::Profile: redTRCTag has unexpected type");
- // ICC v4, 9.2.48 saturationRenderingIntentGamutTag
- // "Permitted tag types: signatureType"
- if (!has_type(saturationRenderingIntentGamutTag, { SignatureTagData::Type }, {}))
- return Error::from_string_literal("ICC::Profile: saturationRenderingIntentGamutTag has unexpected type");
- // ICC v4, 9.2.49 technologyTag
- // "Permitted tag types: signatureType"
- if (!has_type(technologyTag, { SignatureTagData::Type }, {}))
- return Error::from_string_literal("ICC::Profile: technologyTag has unexpected type");
- // ICC v4, 9.2.50 viewingCondDescTag
- // "Permitted tag types: multiLocalizedUnicodeType"
- // ICC v2, 6.4.46 viewingCondDescTag
- // "Tag Type: textDescriptionType"
- if (auto type = m_tag_table.get(viewingCondDescTag); type.has_value()) {
- if (is_v4() && type.value()->type() != MultiLocalizedUnicodeTagData::Type)
- return Error::from_string_literal("ICC::Profile: viewingCondDescTag has unexpected v4 type");
- if (is_v2() && type.value()->type() != TextDescriptionTagData::Type)
- return Error::from_string_literal("ICC::Profile: viewingCondDescTag has unexpected v2 type");
- }
- // ICC v4, 9.2.51 viewingConditionsTag
- // "Permitted tag types: viewingConditionsType"
- if (!has_type(viewingConditionsTag, { ViewingConditionsTagData::Type }, {}))
- return Error::from_string_literal("ICC::Profile: viewingConditionsTag has unexpected type");
- // FIXME: Add validation for v2-only tags:
- // - ICC v2, 6.4.14 crdInfoTag
- // "Tag Type: crdInfoType"
- // - ICC v2, 6.4.17 deviceSettingsTag
- // "Tag Type: deviceSettingsType"
- // - ICC v2, 6.4.24 mediaBlackPointTag
- // "Tag Type: XYZType"
- // - ICC v2, 6.4.26 namedColorTag
- // "Tag Type: namedColorType"
- // - ICC v2, 6.4.34 ps2CRD0Tag
- // "Tag Type: dataType"
- // - ICC v2, 6.4.35 ps2CRD1Tag
- // "Tag Type: dataType"
- // - ICC v2, 6.4.36 ps2CRD2Tag
- // "Tag Type: dataType"
- // - ICC v2, 6.4.37 ps2CRD3Tag
- // "Tag Type: dataType"
- // - ICC v2, 6.4.38 ps2CSATag
- // "Tag Type: dataType"
- // - ICC v2, 6.4.39 ps2RenderingIntentTag
- // "Tag Type: dataType"
- // - ICC v2, 6.4.42 screeningDescTag
- // "Tag Type: textDescriptionType"
- // - ICC v2, 6.4.43 screeningTag
- // "Tag Type: screeningType"
- // - ICC v2, 6.4.45 ucrbgTag
- // "Tag Type: ucrbgType"
- // https://www.color.org/v2profiles.xalter says about these tags:
- // "it is also recommended that optional tags in the v2 specification that have subsequently become
- // obsolete are not included in future profiles made to the v2 specification."
- return {};
- }
- ErrorOr<NonnullRefPtr<Profile>> Profile::try_load_from_externally_owned_memory(ReadonlyBytes bytes)
- {
- auto header = TRY(read_header(bytes));
- bytes = bytes.trim(header.on_disk_size);
- auto tag_table = TRY(read_tag_table(bytes));
- return create(header, move(tag_table));
- }
- ErrorOr<NonnullRefPtr<Profile>> Profile::create(ProfileHeader const& header, OrderedHashMap<TagSignature, NonnullRefPtr<TagData>> tag_table)
- {
- auto profile = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) Profile(header, move(tag_table))));
- TRY(profile->check_required_tags());
- TRY(profile->check_tag_types());
- return profile;
- }
- Crypto::Hash::MD5::DigestType Profile::compute_id(ReadonlyBytes bytes)
- {
- // ICC v4, 7.2.18 Profile ID field
- // "The Profile ID shall be calculated using the MD5 fingerprinting method as defined in Internet RFC 1321.
- // The entire profile, whose length is given by the size field in the header, with the
- // profile flags field (bytes 44 to 47, see 7.2.11),
- // rendering intent field (bytes 64 to 67, see 7.2.15),
- // and profile ID field (bytes 84 to 99)
- // in the profile header temporarily set to zeros (00h),
- // shall be used to calculate the ID."
- const u8 zero[16] = {};
- Crypto::Hash::MD5 md5;
- md5.update(bytes.slice(0, 44));
- md5.update(ReadonlyBytes { zero, 4 }); // profile flags field
- md5.update(bytes.slice(48, 64 - 48));
- md5.update(ReadonlyBytes { zero, 4 }); // rendering intent field
- md5.update(bytes.slice(68, 84 - 68));
- md5.update(ReadonlyBytes { zero, 16 }); // profile ID field
- md5.update(bytes.slice(100));
- return md5.digest();
- }
- static TagSignature forward_transform_tag_for_rendering_intent(RenderingIntent rendering_intent)
- {
- // ICCv4, Table 25 — Profile type/profile tag and defined rendering intents
- // This function assumes a profile class of InputDevice, DisplayDevice, OutputDevice, or ColorSpace.
- switch (rendering_intent) {
- case RenderingIntent::Perceptual:
- return AToB0Tag;
- case RenderingIntent::MediaRelativeColorimetric:
- case RenderingIntent::ICCAbsoluteColorimetric:
- return AToB1Tag;
- case RenderingIntent::Saturation:
- return AToB2Tag;
- }
- VERIFY_NOT_REACHED();
- }
- ErrorOr<FloatVector3> Profile::to_pcs_a_to_b(TagData const& tag_data, ReadonlyBytes color) const
- {
- // Assumes a "normal" device_class() (i.e. not DeviceLink).
- VERIFY(number_of_components_in_color_space(connection_space()) == 3);
- if (m_to_pcs_clut_cache.has_value() && m_to_pcs_clut_cache->key == color)
- return m_to_pcs_clut_cache->value;
- FloatVector3 result;
- switch (tag_data.type()) {
- case Lut16TagData::Type: {
- auto const& a_to_b = static_cast<Lut16TagData const&>(tag_data);
- result = TRY(a_to_b.evaluate(data_color_space(), connection_space(), color));
- break;
- }
- case Lut8TagData::Type: {
- auto const& a_to_b = static_cast<Lut8TagData const&>(tag_data);
- result = TRY(a_to_b.evaluate(data_color_space(), connection_space(), color));
- break;
- }
- case LutAToBTagData::Type: {
- auto const& a_to_b = static_cast<LutAToBTagData const&>(tag_data);
- if (a_to_b.number_of_input_channels() != number_of_components_in_color_space(data_color_space()))
- return Error::from_string_literal("ICC::Profile::to_pcs_a_to_b: mAB input channel count does not match color space size");
- if (a_to_b.number_of_output_channels() != number_of_components_in_color_space(connection_space()))
- return Error::from_string_literal("ICC::Profile::to_pcs_a_to_b: mAB output channel count does not match profile connection space size");
- result = TRY(a_to_b.evaluate(connection_space(), color));
- break;
- }
- default:
- VERIFY_NOT_REACHED();
- }
- if (!m_to_pcs_clut_cache.has_value())
- m_to_pcs_clut_cache = OneElementCLUTCache {};
- m_to_pcs_clut_cache->key = Vector<u8, 4>(color);
- m_to_pcs_clut_cache->value = result;
- return result;
- }
- ErrorOr<FloatVector3> Profile::to_pcs(ReadonlyBytes color) const
- {
- if (color.size() != number_of_components_in_color_space(data_color_space()))
- return Error::from_string_literal("ICC::Profile: input color doesn't match color space size");
- auto get_tag = [&](auto tag) { return m_tag_table.get(tag); };
- switch (device_class()) {
- case DeviceClass::InputDevice:
- case DeviceClass::DisplayDevice:
- case DeviceClass::OutputDevice:
- case DeviceClass::ColorSpace: {
- // ICC v4, 8.10 Precedence order of tag usage
- // "There are several methods of colour transformation that can function within a single CMM. If data for more than
- // one method are included in the same profile, the following selection algorithm shall be used by the software
- // implementation."
- // ICC v4, 8.10.2 Input, display, output, or colour space profile types
- // "a) Use the BToD0Tag, BToD1Tag, BToD2Tag, BToD3Tag, DToB0Tag, DToB1Tag, DToB2Tag, or
- // DToB3Tag designated for the rendering intent if the tag is present, except where this tag is not needed or
- // supported by the CMM (if a particular processing element within the tag is not supported the tag is not
- // supported)."
- // FIXME: Implement multiProcessElementsType one day.
- // "b) Use the BToA0Tag, BToA1Tag, BToA2Tag, AToB0Tag, AToB1Tag, or AToB2Tag designated for the
- // rendering intent if present, when the tag in a) is not used."
- if (m_cached_has_any_a_to_b_tag)
- if (auto tag = get_tag(forward_transform_tag_for_rendering_intent(rendering_intent())); tag.has_value())
- return to_pcs_a_to_b(*tag.value(), color);
- // "c) Use the BToA0Tag or AToB0Tag if present, when the tags in a) and b) are not used."
- // AToB0Tag is for the conversion _to_ PCS (BToA0Tag is for conversion _from_ PCS, so not needed in this function).
- if (m_cached_has_a_to_b0_tag)
- if (auto tag = get_tag(AToB0Tag); tag.has_value())
- return to_pcs_a_to_b(*tag.value(), color);
- // "d) Use TRCs (redTRCTag, greenTRCTag, blueTRCTag, or grayTRCTag) and colorants
- // (redMatrixColumnTag, greenMatrixColumnTag, blueMatrixColumnTag) when tags in a), b), and c) are not
- // used."
- auto evaluate_curve = [this](TagSignature curve_tag, float f) {
- auto const& trc = *m_tag_table.get(curve_tag).value();
- VERIFY(trc.type() == CurveTagData::Type || trc.type() == ParametricCurveTagData::Type);
- if (trc.type() == CurveTagData::Type)
- return static_cast<CurveTagData const&>(trc).evaluate(f);
- return static_cast<ParametricCurveTagData const&>(trc).evaluate(f);
- };
- if (data_color_space() == ColorSpace::Gray) {
- VERIFY(color.size() == 1); // True because of color.size() check further up.
- // ICC v4, F.2 grayTRCTag
- // "connection = grayTRC[device]"
- float gray = evaluate_curve(grayTRCTag, color[0] / 255.f);
- FloatVector3 white { pcs_illuminant().X, pcs_illuminant().Y, pcs_illuminant().Z };
- return white * gray;
- }
- // FIXME: Per ICC v4, A.1 General, this should also handle HLS, HSV, YCbCr.
- if (data_color_space() == ColorSpace::RGB) {
- if (!m_cached_has_all_rgb_matrix_tags)
- return Error::from_string_literal("ICC::Profile::to_pcs: RGB color space but neither LUT-based nor matrix-based tags present");
- VERIFY(color.size() == 3); // True because of color.size() check further up.
- // ICC v4, F.3 Three-component matrix-based profiles
- // "linear_r = redTRC[device_r]
- // linear_g = greenTRC[device_g]
- // linear_b = blueTRC[device_b]
- // [connection_X] = [redMatrixColumn_X greenMatrixColumn_X blueMatrixColumn_X] [ linear_r ]
- // [connection_Y] = [redMatrixColumn_Y greenMatrixColumn_Y blueMatrixColumn_Y] * [ linear_g ]
- // [connection_Z] = [redMatrixColumn_Z greenMatrixColumn_Z blueMatrixColumn_Z] [ linear_b ]"
- FloatVector3 linear_rgb {
- evaluate_curve(redTRCTag, color[0] / 255.f),
- evaluate_curve(greenTRCTag, color[1] / 255.f),
- evaluate_curve(blueTRCTag, color[2] / 255.f),
- };
- return rgb_to_xyz_matrix() * linear_rgb;
- }
- return Error::from_string_literal("ICC::Profile::to_pcs: What happened?!");
- }
- case DeviceClass::DeviceLink:
- case DeviceClass::Abstract:
- // ICC v4, 8.10.3 DeviceLink or Abstract profile types
- // FIXME
- return Error::from_string_literal("ICC::Profile::to_pcs: conversion for DeviceLink and Abstract not implemented");
- case DeviceClass::NamedColor:
- return Error::from_string_literal("ICC::Profile::to_pcs: to_pcs with NamedColor profile does not make sense");
- }
- VERIFY_NOT_REACHED();
- }
- static FloatVector3 lab_from_xyz(FloatVector3 xyz, XYZ white_point)
- {
- // 6.3.2.2 Translation between media-relative colorimetric data and ICC-absolute colorimetric data
- // 6.3.2.3 Computation of PCSLAB
- // 6.3.4 Colour space encodings for the PCS
- // A.3 PCS encodings
- auto f = [](float x) {
- if (x > powf(6.f / 29.f, 3))
- return cbrtf(x);
- return x / (3 * powf(6.f / 29.f, 2)) + 4.f / 29.f;
- };
- // "X/Xn is replaced by Xr/Xi (or Xa/Xmw)"
- // 6.3.2.2 Translation between media-relative colorimetric data and ICC-absolute colorimetric data
- // "The translation from ICC-absolute colorimetric data to media-relative colorimetry data is given by Equations
- // Xr = (Xi/Xmw) * Xa
- // where
- // Xr media-relative colorimetric data (i.e. PCSXYZ);
- // Xa ICC-absolute colorimetric data (i.e. nCIEXYZ);
- // Xmw nCIEXYZ values of the media white point as specified in the mediaWhitePointTag;
- // Xi PCSXYZ values of the PCS white point defined in 6.3.4.3."
- // 6.3.4.3 PCS encodings for white and black
- // "Table 14 — Encodings of PCS white point: X 0,9642 Y 1,0000 Z 0,8249"
- // That's identical to the values in 7.2.16 PCS illuminant field (Bytes 68 to 79).
- // 9.2.36 mediaWhitePointTag
- // "For displays, the values specified shall be those of the PCS illuminant as defined in 7.2.16."
- // ...so for displays, this is all equivalent I think? It's maybe different for OutputDevice profiles?
- float Xn = white_point.X;
- float Yn = white_point.Y;
- float Zn = white_point.Z;
- float x = xyz[0] / Xn;
- float y = xyz[1] / Yn;
- float z = xyz[2] / Zn;
- float L = 116 * f(y) - 16;
- float a = 500 * (f(x) - f(y));
- float b = 200 * (f(y) - f(z));
- return { L, a, b };
- }
- static FloatVector3 xyz_from_lab(FloatVector3 lab, XYZ white_point)
- {
- // Inverse of lab_from_xyz().
- auto L_star = lab[0];
- auto a_star = lab[1];
- auto b_star = lab[2];
- auto L = (L_star + 16) / 116 + a_star / 500; // f(x)
- auto M = (L_star + 16) / 116; // f(y)
- auto N = (L_star + 16) / 116 - b_star / 200; // f(z)
- // Inverse of f in lab_from_xyz().
- auto g = [](float x) {
- if (x >= 6.0f / 29.0f)
- return powf(x, 3);
- return (x - 4.0f / 29.0f) * (3 * powf(6.f / 29.f, 2));
- };
- return { white_point.X * g(L), white_point.Y * g(M), white_point.Z * g(N) };
- }
- static TagSignature backward_transform_tag_for_rendering_intent(RenderingIntent rendering_intent)
- {
- // ICCv4, Table 25 — Profile type/profile tag and defined rendering intents
- // This function assumes a profile class of InputDevice, DisplayDevice, OutputDevice, or ColorSpace.
- switch (rendering_intent) {
- case RenderingIntent::Perceptual:
- return BToA0Tag;
- case RenderingIntent::MediaRelativeColorimetric:
- case RenderingIntent::ICCAbsoluteColorimetric:
- return BToA1Tag;
- case RenderingIntent::Saturation:
- return BToA2Tag;
- }
- VERIFY_NOT_REACHED();
- }
- ErrorOr<void> Profile::from_pcs_b_to_a(TagData const& tag_data, FloatVector3 const& pcs, Bytes out_bytes) const
- {
- switch (tag_data.type()) {
- case Lut16TagData::Type:
- // FIXME
- return Error::from_string_literal("ICC::Profile::to_pcs: BToA*Tag handling for mft2 tags not yet implemented");
- case Lut8TagData::Type:
- // FIXME
- return Error::from_string_literal("ICC::Profile::to_pcs: BToA*Tag handling for mft1 tags not yet implemented");
- case LutBToATagData::Type: {
- auto const& b_to_a = static_cast<LutBToATagData const&>(tag_data);
- if (b_to_a.number_of_input_channels() != number_of_components_in_color_space(connection_space()))
- return Error::from_string_literal("ICC::Profile::from_pcs_b_to_a: mBA input channel count does not match color space size");
- if (b_to_a.number_of_output_channels() != number_of_components_in_color_space(data_color_space()))
- return Error::from_string_literal("ICC::Profile::from_pcs_b_to_a: mBA output channel count does not match profile connection space size");
- return b_to_a.evaluate(connection_space(), pcs, out_bytes);
- }
- }
- VERIFY_NOT_REACHED();
- }
- ErrorOr<void> Profile::from_pcs(Profile const& source_profile, FloatVector3 pcs, Bytes color) const
- {
- if (source_profile.connection_space() != connection_space()) {
- if (source_profile.connection_space() == ColorSpace::PCSLAB) {
- VERIFY(connection_space() == ColorSpace::PCSXYZ);
- pcs = xyz_from_lab(pcs, source_profile.pcs_illuminant());
- } else {
- VERIFY(source_profile.connection_space() == ColorSpace::PCSXYZ);
- VERIFY(connection_space() == ColorSpace::PCSLAB);
- pcs = lab_from_xyz(pcs, pcs_illuminant());
- }
- }
- // See `to_pcs()` for spec links.
- // This function is very similar, but uses BToAn instead of AToBn for LUT profiles,
- // and an inverse transform for matrix profiles.
- if (color.size() != number_of_components_in_color_space(data_color_space()))
- return Error::from_string_literal("ICC::Profile: output color doesn't match color space size");
- auto get_tag = [&](auto tag) { return m_tag_table.get(tag); };
- switch (device_class()) {
- case DeviceClass::InputDevice:
- case DeviceClass::DisplayDevice:
- case DeviceClass::OutputDevice:
- case DeviceClass::ColorSpace: {
- // FIXME: Implement multiProcessElementsType one day.
- if (m_cached_has_any_b_to_a_tag)
- if (auto tag = get_tag(backward_transform_tag_for_rendering_intent(rendering_intent())); tag.has_value())
- return from_pcs_b_to_a(*tag.value(), pcs, color);
- if (m_cached_has_b_to_a0_tag)
- if (auto tag = get_tag(BToA0Tag); tag.has_value())
- return from_pcs_b_to_a(*tag.value(), pcs, color);
- if (data_color_space() == ColorSpace::Gray) {
- // FIXME
- return Error::from_string_literal("ICC::Profile::from_pcs: Gray handling not yet implemented");
- }
- // FIXME: Per ICC v4, A.1 General, this should also handle HLS, HSV, YCbCr.
- if (data_color_space() == ColorSpace::RGB) {
- if (!m_cached_has_all_rgb_matrix_tags)
- return Error::from_string_literal("ICC::Profile::from_pcs: RGB color space but neither LUT-based nor matrix-based tags present");
- VERIFY(color.size() == 3); // True because of color.size() check further up.
- // ICC v4, F.3 Three-component matrix-based profiles
- // "The inverse model is given by the following equations:
- // [linear_r] = [redMatrixColumn_X greenMatrixColumn_X blueMatrixColumn_X]^-1 [ connection_X ]
- // [linear_g] = [redMatrixColumn_Y greenMatrixColumn_Y blueMatrixColumn_Y] * [ connection_Y ]
- // [linear_b] = [redMatrixColumn_Z greenMatrixColumn_Z blueMatrixColumn_Z] [ connection_Z ]
- //
- // for linear_r < 0, device_r = redTRC^-1[0] (F.8)
- // for 0 ≤ linear_r ≤ 1, device_r = redTRC^-1[linear_r] (F.9)
- // for linear_r > 1, device_r = redTRC^-1[1] (F.10)
- //
- // for linear_g < 0, device_g = greenTRC^-1[0] (F.11)
- // for 0 ≤ linear_g ≤ 1, device_g = greenTRC^-1[linear_g] (F.12)
- // for linear_g > 1, device_g = greenTRC^-1[1] (F.13)
- //
- // for linear_b < 0, device_b = blueTRC^-1[0] (F.14)
- // for 0 ≤ linear_b ≤ 1, device_b = blueTRC^-1[linear_b] (F.15)
- // for linear_b > 1, device_b = blueTRC^-1[1] (F.16)
- //
- // where redTRC^-1, greenTRC^-1, and blueTRC^-1 indicate the inverse functions of the redTRC greenTRC and
- // blueTRC functions respectively.
- // If the redTRC, greenTRC, or blueTRC function is not invertible the behaviour of the corresponding redTRC^-1,
- // greenTRC^-1, and blueTRC^-1 function is undefined. If a one-dimensional curve is constant, the curve cannot be
- // inverted."
- // Convert from XYZ to linear rgb.
- // FIXME: Inverting curves on every call to this function is very inefficient.
- FloatVector3 linear_rgb = TRY(xyz_to_rgb_matrix()) * pcs;
- auto evaluate_curve_inverse = [this](TagSignature curve_tag, float f) {
- auto const& trc = *m_tag_table.get(curve_tag).value();
- VERIFY(trc.type() == CurveTagData::Type || trc.type() == ParametricCurveTagData::Type);
- if (trc.type() == CurveTagData::Type)
- return static_cast<CurveTagData const&>(trc).evaluate_inverse(f);
- return static_cast<ParametricCurveTagData const&>(trc).evaluate_inverse(f);
- };
- // Convert from linear rgb to device rgb.
- // See equations (F.8) - (F.16) above.
- // FIXME: The spec says to do this, but it loses information. Color.js returns unclamped
- // values instead (...but how do those make it through the TRC?) and has a separate
- // clipping step. Maybe that's better?
- // Also, maybe doing actual gamut mapping would look better?
- // (For LUT profiles, I think the gamut mapping is baked into the BToA* data in the profile (?).
- // But for matrix profiles, it'd have to be done in code.)
- linear_rgb.clamp(0.f, 1.f);
- float device_r = evaluate_curve_inverse(redTRCTag, linear_rgb[0]);
- float device_g = evaluate_curve_inverse(greenTRCTag, linear_rgb[1]);
- float device_b = evaluate_curve_inverse(blueTRCTag, linear_rgb[2]);
- color[0] = round(255 * device_r);
- color[1] = round(255 * device_g);
- color[2] = round(255 * device_b);
- return {};
- }
- return Error::from_string_literal("ICC::Profile::from_pcs: What happened?!");
- }
- case DeviceClass::DeviceLink:
- case DeviceClass::Abstract:
- // ICC v4, 8.10.3 DeviceLink or Abstract profile types
- // FIXME
- return Error::from_string_literal("ICC::Profile::from_pcs: conversion for DeviceLink and Abstract not implemented");
- case DeviceClass::NamedColor:
- return Error::from_string_literal("ICC::Profile::from_pcs: from_pcs with NamedColor profile does not make sense");
- }
- VERIFY_NOT_REACHED();
- }
- ErrorOr<CIELAB> Profile::to_lab(ReadonlyBytes color) const
- {
- auto pcs = TRY(to_pcs(color));
- if (connection_space() == ColorSpace::PCSLAB)
- return CIELAB { pcs[0], pcs[1], pcs[2] };
- if (connection_space() != ColorSpace::PCSXYZ) {
- VERIFY(device_class() == DeviceClass::DeviceLink);
- return Error::from_string_literal("ICC::Profile::to_lab: conversion for DeviceLink not implemented");
- }
- FloatVector3 lab = lab_from_xyz(pcs, pcs_illuminant());
- return CIELAB { lab[0], lab[1], lab[2] };
- }
- MatrixMatrixConversion::MatrixMatrixConversion(LutCurveType source_red_TRC,
- LutCurveType source_green_TRC,
- LutCurveType source_blue_TRC,
- FloatMatrix3x3 matrix,
- LutCurveType destination_red_TRC,
- LutCurveType destination_green_TRC,
- LutCurveType destination_blue_TRC)
- : m_source_red_TRC(move(source_red_TRC))
- , m_source_green_TRC(move(source_green_TRC))
- , m_source_blue_TRC(move(source_blue_TRC))
- , m_matrix(matrix)
- , m_destination_red_TRC(move(destination_red_TRC))
- , m_destination_green_TRC(move(destination_green_TRC))
- , m_destination_blue_TRC(move(destination_blue_TRC))
- {
- auto check = [](auto const& trc) {
- VERIFY(trc->type() == CurveTagData::Type || trc->type() == ParametricCurveTagData::Type);
- };
- check(m_source_red_TRC);
- check(m_source_green_TRC);
- check(m_source_blue_TRC);
- check(m_destination_red_TRC);
- check(m_destination_green_TRC);
- check(m_destination_blue_TRC);
- }
- Optional<MatrixMatrixConversion> Profile::matrix_matrix_conversion(Profile const& source_profile) const
- {
- auto has_normal_device_class = [](DeviceClass device) {
- return device == DeviceClass::InputDevice
- || device == DeviceClass::DisplayDevice
- || device == DeviceClass::OutputDevice
- || device == DeviceClass::ColorSpace;
- };
- bool is_matrix_matrix_conversion = has_normal_device_class(device_class())
- && has_normal_device_class(source_profile.device_class())
- && connection_space() == ColorSpace::PCSXYZ
- && source_profile.connection_space() == ColorSpace::PCSXYZ
- && data_color_space() == ColorSpace::RGB
- && source_profile.data_color_space() == ColorSpace::RGB
- && !m_cached_has_any_a_to_b_tag
- && !source_profile.m_cached_has_any_a_to_b_tag
- && m_cached_has_all_rgb_matrix_tags
- && source_profile.m_cached_has_all_rgb_matrix_tags
- && rgb_to_xyz_matrix().is_invertible();
- if (!is_matrix_matrix_conversion)
- return OptionalNone {};
- LutCurveType sourceRedTRC = *source_profile.m_tag_table.get(redTRCTag).value();
- LutCurveType sourceGreenTRC = *source_profile.m_tag_table.get(greenTRCTag).value();
- LutCurveType sourceBlueTRC = *source_profile.m_tag_table.get(blueTRCTag).value();
- FloatMatrix3x3 matrix = MUST(xyz_to_rgb_matrix()) * source_profile.rgb_to_xyz_matrix();
- LutCurveType destinationRedTRC = *m_tag_table.get(redTRCTag).value();
- LutCurveType destinationGreenTRC = *m_tag_table.get(greenTRCTag).value();
- LutCurveType destinationBlueTRC = *m_tag_table.get(blueTRCTag).value();
- return MatrixMatrixConversion(sourceRedTRC, sourceGreenTRC, sourceBlueTRC, matrix, destinationRedTRC, destinationGreenTRC, destinationBlueTRC);
- }
- ErrorOr<void> Profile::convert_image_matrix_matrix(Gfx::Bitmap& bitmap, MatrixMatrixConversion const& map) const
- {
- for (auto& pixel : bitmap) {
- FloatVector3 rgb { (float)Color::from_argb(pixel).red(), (float)Color::from_argb(pixel).green(), (float)Color::from_argb(pixel).blue() };
- auto out = map.map(rgb / 255.0f);
- out.set_alpha(Color::from_argb(pixel).alpha());
- pixel = out.value();
- }
- return {};
- }
- ErrorOr<void> Profile::convert_image(Gfx::Bitmap& bitmap, Profile const& source_profile) const
- {
- if (auto map = matrix_matrix_conversion(source_profile); map.has_value())
- return convert_image_matrix_matrix(bitmap, map.value());
- for (auto& pixel : bitmap) {
- u8 rgb[] = { Color::from_argb(pixel).red(), Color::from_argb(pixel).green(), Color::from_argb(pixel).blue() };
- auto pcs = TRY(source_profile.to_pcs(rgb));
- TRY(from_pcs(source_profile, pcs, rgb));
- pixel = Color(rgb[0], rgb[1], rgb[2], Color::from_argb(pixel).alpha()).value();
- }
- return {};
- }
- ErrorOr<void> Profile::convert_cmyk_image(Bitmap& out, CMYKBitmap const& in, Profile const& source_profile) const
- {
- if (out.size() != in.size())
- return Error::from_string_literal("ICC::Profile::convert_cmyk_image: out and in must have the same dimensions");
- // Might fail if `out` has a scale_factor() != 1.
- if (out.data_size() != in.data_size())
- return Error::from_string_literal("ICC::Profile::convert_cmyk_image: out and in must have the same buffer size");
- static_assert(sizeof(ARGB32) == sizeof(CMYK));
- ARGB32* out_data = out.begin();
- CMYK const* in_data = const_cast<CMYKBitmap&>(in).begin();
- for (size_t i = 0; i < in.data_size() / sizeof(CMYK); ++i) {
- u8 cmyk[] = { in_data[i].c, in_data[i].m, in_data[i].y, in_data[i].k };
- auto pcs = TRY(source_profile.to_pcs(cmyk));
- u8 rgb[3];
- TRY(from_pcs(source_profile, pcs, rgb));
- out_data[i] = Color(rgb[0], rgb[1], rgb[2]).value();
- }
- return {};
- }
- XYZ const& Profile::red_matrix_column() const { return xyz_data(redMatrixColumnTag); }
- XYZ const& Profile::green_matrix_column() const { return xyz_data(greenMatrixColumnTag); }
- XYZ const& Profile::blue_matrix_column() const { return xyz_data(blueMatrixColumnTag); }
- Optional<String> Profile::tag_string_data(TagSignature signature) const
- {
- auto maybe_tag_data = tag_data(signature);
- if (!maybe_tag_data.has_value())
- return {};
- auto& tag_data = maybe_tag_data.release_value();
- if (tag_data.type() == Gfx::ICC::MultiLocalizedUnicodeTagData::Type) {
- auto& multi_localized_unicode = static_cast<Gfx::ICC::MultiLocalizedUnicodeTagData const&>(tag_data);
- // Try to find 'en-US', otherwise any 'en' language, otherwise the first record.
- Optional<String> en_string;
- constexpr u16 language_en = ('e' << 8) + 'n';
- constexpr u16 country_us = ('U' << 8) + 'S';
- for (auto const& record : multi_localized_unicode.records()) {
- if (record.iso_639_1_language_code == language_en) {
- if (record.iso_3166_1_country_code == country_us)
- return record.text;
- en_string = record.text;
- }
- }
- if (en_string.has_value())
- return en_string.value();
- if (!multi_localized_unicode.records().is_empty())
- return multi_localized_unicode.records().first().text;
- return {};
- }
- if (tag_data.type() == Gfx::ICC::TextDescriptionTagData::Type) {
- auto& text_description = static_cast<Gfx::ICC::TextDescriptionTagData const&>(tag_data);
- return text_description.ascii_description();
- }
- if (tag_data.type() == Gfx::ICC::TextTagData::Type) {
- auto& text = static_cast<Gfx::ICC::TextTagData const&>(tag_data);
- return text.text();
- }
- return {};
- }
- ErrorOr<FloatMatrix3x3> Profile::xyz_to_rgb_matrix() const
- {
- if (!m_cached_xyz_to_rgb_matrix.has_value()) {
- FloatMatrix3x3 forward_matrix = rgb_to_xyz_matrix();
- if (!forward_matrix.is_invertible())
- return Error::from_string_literal("ICC::Profile::from_pcs: matrix not invertible");
- m_cached_xyz_to_rgb_matrix = forward_matrix.inverse();
- }
- return m_cached_xyz_to_rgb_matrix.value();
- }
- FloatMatrix3x3 Profile::rgb_to_xyz_matrix() const
- {
- auto const& red_matrix_column = this->red_matrix_column();
- auto const& green_matrix_column = this->green_matrix_column();
- auto const& blue_matrix_column = this->blue_matrix_column();
- return FloatMatrix3x3 {
- red_matrix_column.X, green_matrix_column.X, blue_matrix_column.X,
- red_matrix_column.Y, green_matrix_column.Y, blue_matrix_column.Y,
- red_matrix_column.Z, green_matrix_column.Z, blue_matrix_column.Z
- };
- }
- }
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