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- /*
- * Copyright (c) 2023, Nico Weber <thakis@chromium.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #pragma once
- #include <AK/Endian.h>
- #include <LibGfx/ICC/DistinctFourCC.h>
- #include <LibGfx/ICC/Profile.h>
- #include <LibGfx/ICC/TagTypes.h>
- #include <math.h>
- namespace Gfx::ICC {
- // ICC V4, 4.2 dateTimeNumber
- // "All the dateTimeNumber values in a profile shall be in Coordinated Universal Time [...]."
- struct DateTimeNumber {
- BigEndian<u16> year;
- BigEndian<u16> month;
- BigEndian<u16> day;
- BigEndian<u16> hours;
- BigEndian<u16> minutes;
- BigEndian<u16> seconds;
- };
- // ICC V4, 4.6 s15Fixed16Number
- using s15Fixed16Number = i32;
- // ICC V4, 4.7 u16Fixed16Number
- using u16Fixed16Number = u32;
- // ICC V4, 4.14 XYZNumber
- struct XYZNumber {
- BigEndian<s15Fixed16Number> X;
- BigEndian<s15Fixed16Number> Y;
- BigEndian<s15Fixed16Number> Z;
- XYZNumber() = default;
- XYZNumber(XYZ const& xyz)
- : X(round(xyz.X * 0x1'0000))
- , Y(round(xyz.Y * 0x1'0000))
- , Z(round(xyz.Z * 0x1'0000))
- {
- }
- operator XYZ() const
- {
- return XYZ { X / (float)0x1'0000, Y / (float)0x1'0000, Z / (float)0x1'0000 };
- }
- };
- // ICC V4, 7.2 Profile header
- struct ICCHeader {
- BigEndian<u32> profile_size;
- BigEndian<PreferredCMMType> preferred_cmm_type;
- u8 profile_version_major;
- u8 profile_version_minor_bugfix;
- BigEndian<u16> profile_version_zero;
- BigEndian<DeviceClass> profile_device_class;
- BigEndian<ColorSpace> data_color_space;
- BigEndian<ColorSpace> profile_connection_space; // "PCS" in the spec.
- DateTimeNumber profile_creation_time;
- BigEndian<u32> profile_file_signature;
- BigEndian<PrimaryPlatform> primary_platform;
- BigEndian<u32> profile_flags;
- BigEndian<DeviceManufacturer> device_manufacturer;
- BigEndian<DeviceModel> device_model;
- BigEndian<u64> device_attributes;
- BigEndian<RenderingIntent> rendering_intent;
- XYZNumber pcs_illuminant;
- BigEndian<Creator> profile_creator;
- u8 profile_id[16];
- u8 reserved[28];
- };
- static_assert(AssertSize<ICCHeader, 128>());
- // ICC v4, 7.2.9 Profile file signature field
- // "The profile file signature field shall contain the value “acsp” (61637370h) as a profile file signature."
- constexpr u32 ProfileFileSignature = 0x61637370;
- // ICC V4, 7.3 Tag table, Table 24 - Tag table structure
- struct TagTableEntry {
- BigEndian<TagSignature> tag_signature;
- BigEndian<u32> offset_to_beginning_of_tag_data_element;
- BigEndian<u32> size_of_tag_data_element;
- };
- static_assert(AssertSize<TagTableEntry, 12>());
- // Common bits of ICC v4, Table 40 — lut16Type encoding and Table 44 — lut8Type encoding
- struct LUTHeader {
- u8 number_of_input_channels;
- u8 number_of_output_channels;
- u8 number_of_clut_grid_points;
- u8 reserved_for_padding;
- BigEndian<s15Fixed16Number> e_parameters[9];
- };
- static_assert(AssertSize<LUTHeader, 40>());
- // Common bits of ICC v4, Table 45 — lutAToBType encoding and Table 47 — lutBToAType encoding
- struct AdvancedLUTHeader {
- u8 number_of_input_channels;
- u8 number_of_output_channels;
- BigEndian<u16> reserved_for_padding;
- BigEndian<u32> offset_to_b_curves;
- BigEndian<u32> offset_to_matrix;
- BigEndian<u32> offset_to_m_curves;
- BigEndian<u32> offset_to_clut;
- BigEndian<u32> offset_to_a_curves;
- };
- static_assert(AssertSize<AdvancedLUTHeader, 24>());
- // ICC v4, Table 46 — lutAToBType CLUT encoding
- // ICC v4, Table 48 — lutBToAType CLUT encoding
- // (They're identical.)
- struct CLUTHeader {
- u8 number_of_grid_points_in_dimension[16];
- u8 precision_of_data_elements; // 1 for u8 entries, 2 for u16 entries.
- u8 reserved_for_padding[3];
- };
- static_assert(AssertSize<CLUTHeader, 20>());
- // Table 49 — measurementType structure
- struct MeasurementHeader {
- BigEndian<MeasurementTagData::StandardObserver> standard_observer;
- XYZNumber tristimulus_value_for_measurement_backing;
- BigEndian<MeasurementTagData::MeasurementGeometry> measurement_geometry;
- BigEndian<u16Fixed16Number> measurement_flare;
- BigEndian<MeasurementTagData::StandardIlluminant> standard_illuminant;
- };
- static_assert(AssertSize<MeasurementHeader, 28>());
- // ICC v4, 10.15 multiLocalizedUnicodeType
- struct MultiLocalizedUnicodeRawRecord {
- BigEndian<u16> language_code;
- BigEndian<u16> country_code;
- BigEndian<u32> string_length_in_bytes;
- BigEndian<u32> string_offset_in_bytes;
- };
- static_assert(AssertSize<MultiLocalizedUnicodeRawRecord, 12>());
- // Table 66 — namedColor2Type encoding
- struct NamedColorHeader {
- BigEndian<u32> vendor_specific_flag;
- BigEndian<u32> count_of_named_colors;
- BigEndian<u32> number_of_device_coordinates_of_each_named_color;
- u8 prefix_for_each_color_name[32]; // null-terminated
- u8 suffix_for_each_color_name[32]; // null-terminated
- };
- static_assert(AssertSize<NamedColorHeader, 76>());
- // Table 84 — viewingConditionsType encoding
- struct ViewingConditionsHeader {
- XYZNumber unnormalized_ciexyz_values_for_illuminant; // "(in which Y is in cd/m2)"
- XYZNumber unnormalized_ciexyz_values_for_surround; // "(in which Y is in cd/m2)"
- BigEndian<MeasurementTagData::StandardIlluminant> illuminant_type;
- };
- static_assert(AssertSize<ViewingConditionsHeader, 28>());
- }
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