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LibGfx+icc: Print fields that are fourccs registered with the ICC
Namely: - preferred CMM type - device manufacturer - device model - profile creator These all have in common that they can take arbitrary values, so I added a FourCC class to deal with them, instead of using an enum class. I made distinct types for each of them, so that they aren't accidentally mixed up.
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@ -116,6 +116,25 @@ struct ICCHeader {
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};
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static_assert(sizeof(ICCHeader) == 128);
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Optional<PreferredCMMType> parse_preferred_cmm_type(ICCHeader const& header)
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{
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// ICC v4, 7.2.3 Preferred CMM type field
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// "This field may be used to identify the preferred CMM to be used.
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// If used, it shall match a CMM type signature registered in the ICC Tag Registry"
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// https://www.color.org/signatures2.xalter currently links to
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// https://www.color.org/registry/signature/TagRegistry-2021-03.pdf, which contains
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// some CMM signatures.
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// This requirement is often honored in practice, but not always. For example,
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// JPEGs exported in Adobe Lightroom contain profiles that set this to 'Lino',
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// which is not present in the "CMM Signatures" table in that PDF.
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// "If no preferred CMM is identified, this field shall be set to zero (00000000h)."
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if (header.preferred_cmm_type == 0)
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return {};
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return PreferredCMMType { header.preferred_cmm_type };
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}
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ErrorOr<Version> parse_version(ICCHeader const& header)
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{
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// ICC v4, 7.2.4 Profile version field
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@ -217,6 +236,38 @@ ErrorOr<void> parse_file_signature(ICCHeader const& header)
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return {};
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}
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Optional<DeviceManufacturer> parse_device_manufacturer(ICCHeader const& header)
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{
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// ICC v4, 7.2.12 Device manufacturer field
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// "This field may be used to identify a device manufacturer.
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// If used the signature shall match the signature contained in the appropriate section of the ICC signature registry found at www.color.org"
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// Device manufacturers can be looked up at https://www.color.org/signatureRegistry/index.xalter
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// For example: https://www.color.org/signatureRegistry/?entityEntry=APPL-4150504C
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// Some icc files use codes not in that registry. For example. D50_XYZ.icc from https://www.color.org/XYZprofiles.xalter
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// has its device manufacturer set to 'none', but https://www.color.org/signatureRegistry/?entityEntry=none-6E6F6E65 does not exist.
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// "If not used this field shall be set to zero (00000000h)."
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if (header.device_manufacturer == 0)
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return {};
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return DeviceManufacturer { header.device_manufacturer };
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}
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Optional<DeviceModel> parse_device_model(ICCHeader const& header)
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{
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// ICC v4, 7.2.13 Device model field
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// "This field may be used to identify a device model.
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// If used the signature shall match the signature contained in the appropriate section of the ICC signature registry found at www.color.org"
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// Device models can be looked up at https://www.color.org/signatureRegistry/deviceRegistry/index.xalter
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// For example: https://www.color.org/signatureRegistry/deviceRegistry/?entityEntry=7FD8-37464438
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// Some icc files use codes not in that registry. For example. D50_XYZ.icc from https://www.color.org/XYZprofiles.xalter
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// has its device model set to 'none', but https://www.color.org/signatureRegistry/deviceRegistry?entityEntry=none-6E6F6E65 does not exist.
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// "If not used this field shall be set to zero (00000000h)."
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if (header.device_model == 0)
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return {};
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return DeviceModel { header.device_model };
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}
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ErrorOr<RenderingIntent> parse_rendering_intent(ICCHeader const& header)
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{
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// ICC v4, 7.2.15 Rendering intent field
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@ -245,6 +296,20 @@ ErrorOr<XYZ> parse_pcs_illuminant(ICCHeader const& header)
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return xyz;
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}
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Optional<Creator> parse_profile_creator(ICCHeader const& header)
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{
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// ICC v4, 7.2.17 Profile creator field
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// "This field may be used to identify the creator of the profile.
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// If used the signature should match the signature contained in the device manufacturer section of the ICC signature registry found at www.color.org."
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// This is not always true in practice.
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// 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').
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// "If not used this field shall be set to zero (00000000h)."
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if (header.profile_creator == 0)
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return {};
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return Creator { header.profile_creator };
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}
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template<size_t N>
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bool all_bytes_are_zero(const u8 (&bytes)[N])
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{
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@ -410,15 +475,19 @@ ErrorOr<NonnullRefPtr<Profile>> Profile::try_load_from_externally_owned_memory(R
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auto header = *bit_cast<ICCHeader const*>(bytes.data());
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TRY(parse_file_signature(header));
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profile->m_preferred_cmm_type = parse_preferred_cmm_type(header);
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profile->m_version = TRY(parse_version(header));
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profile->m_device_class = TRY(parse_device_class(header));
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profile->m_data_color_space = TRY(parse_data_color_space(header));
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profile->m_connection_space = TRY(parse_connection_space(header));
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profile->m_creation_timestamp = TRY(parse_creation_date_time(header));
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profile->m_flags = Flags { header.profile_flags };
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profile->m_device_manufacturer = parse_device_manufacturer(header);
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profile->m_device_model = parse_device_model(header);
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profile->m_device_attributes = TRY(parse_device_attributes(header));
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profile->m_rendering_intent = TRY(parse_rendering_intent(header));
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profile->m_pcs_illuminant = TRY(parse_pcs_illuminant(header));
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profile->m_creator = parse_profile_creator(header);
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profile->m_id = TRY(parse_profile_id(header, bytes));
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TRY(parse_reserved(header));
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