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LibGfx/ICC: Extract sRGB_curve() function

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This returns just the tone reproduction curve of the sRGB profile.
This commit is contained in:
Nico Weber 2023-04-11 08:53:28 -04:00 • committed by Linus Groh
parent 5da9057a8f
commit 5df35d030f
2 changed files with 10 additions and 3 deletions
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11
Userland/Libraries/LibGfx/ICC/WellKnownProfiles.cpp
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@ -38,6 +38,13 @@ static ErrorOr<NonnullRefPtr<XYZTagData>> XYZ_data(XYZ xyz)
return try_make_ref_counted<XYZTagData>(0, 0, move(xyzs));
}
ErrorOr<NonnullRefPtr<TagData>> sRGB_curve()
{
// Numbers from https://en.wikipedia.org/wiki/SRGB#From_sRGB_to_CIE_XYZ
Array<S15Fixed16, 7> curve_parameters = { 2.4, 1 / 1.055, 0.055 / 1.055, 1 / 12.92, 0.04045 };
return try_make_ref_counted<ParametricCurveTagData>(0, 0, ParametricCurveTagData::FunctionType::sRGB, curve_parameters);
}
ErrorOr<NonnullRefPtr<Profile>> sRGB()
{
// Returns an sRGB profile.
@ -54,9 +61,7 @@ ErrorOr<NonnullRefPtr<Profile>> sRGB()
TRY(tag_table.try_set(copyrightTag, TRY(en_US("Public Domain"sv))));
// Transfer function.
// Numbers from https://en.wikipedia.org/wiki/SRGB#From_sRGB_to_CIE_XYZ
Array<S15Fixed16, 7> curve_parameters = { 2.4, 1 / 1.055, 0.055 / 1.055, 1 / 12.92, 0.04045 };
auto curve = TRY(try_make_ref_counted<ParametricCurveTagData>(0, 0, ParametricCurveTagData::FunctionType::sRGB, curve_parameters));
auto curve = TRY(sRGB_curve());
TRY(tag_table.try_set(redTRCTag, curve));
TRY(tag_table.try_set(greenTRCTag, curve));
TRY(tag_table.try_set(blueTRCTag, curve));

2
Userland/Libraries/LibGfx/ICC/WellKnownProfiles.h
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@ -15,4 +15,6 @@ class Profile;
ErrorOr<NonnullRefPtr<Profile>> sRGB();
ErrorOr<NonnullRefPtr<TagData>> sRGB_curve();
}