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LibGfx+icc: Print pcs illuminant

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Nico Weber 2023-01-01 07:09:38 -05:00 • committed by Andreas Kling
parent 3df2eb66be
commit 79badfd650
3 changed files with 47 additions and 3 deletions
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33
Userland/Libraries/LibGfx/ICCProfile.cpp
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@ -6,6 +6,7 @@
#include <AK/Endian.h>
#include <LibGfx/ICCProfile.h>
#include <math.h>
#include <time.h>
// V2 spec: https://color.org/specification/ICC.1-2001-04.pdf
@ -26,6 +27,21 @@ struct DateTimeNumber {
BigEndian<u16> seconds;
};
// ICC V4, 4.6 s15Fixed16Number
using s15Fixed16Number = i32;
// ICC V4, 4.14 XYZNumber
struct XYZNumber {
BigEndian<s15Fixed16Number> x;
BigEndian<s15Fixed16Number> y;
BigEndian<s15Fixed16Number> z;
operator XYZ() const
{
return XYZ { x / (double)0x1'0000, y / (double)0x1'0000, z / (double)0x1'0000 };
}
};
ErrorOr<time_t> parse_date_time_number(DateTimeNumber const& date_time)
{
// ICC V4, 4.2 dateTimeNumber
@ -91,9 +107,7 @@ struct ICCHeader {
BigEndian<u64> device_attributes;
BigEndian<u32> rendering_intent;
BigEndian<i32> pcs_illuminant_x;
BigEndian<i32> pcs_illuminant_y;
BigEndian<i32> pcs_illuminant_z;
XYZNumber pcs_illuminant;
BigEndian<u32> profile_creator;
@ -194,6 +208,18 @@ ErrorOr<RenderingIntent> parse_rendering_intent(ICCHeader const& header)
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;
}
ErrorOr<time_t> parse_creation_date_time(ICCHeader const& header)
{
// iCC v4, 7.2.8 Date and time field
@ -337,6 +363,7 @@ ErrorOr<NonnullRefPtr<Profile>> Profile::try_load_from_externally_owned_memory(R
profile->m_creation_timestamp = TRY(parse_creation_date_time(header));
profile->m_flags = Flags { header.profile_flags };
profile->m_rendering_intent = TRY(parse_rendering_intent(header));
profile->m_pcs_illuminant = TRY(parse_pcs_illuminant(header));
return profile;
}