mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-09-25 10:48:53 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 9

LibPDF: Ignore input whitepoint in convert_to_d65()

Browse source 
CalRGBColorSpace::color() converts into a flat xyz space,
which already takes input whitepoint into account.

It shouldn't be taken into account again when converting from
the flat color space to D65.
This commit is contained in:
Nico Weber 2023-10-31 21:03:19 -04:00 • committed by Tim Flynn
commit bdd2404453
Notes: sideshowbarker 2024-07-17 20:19:08 +09:00
1 changed files with 3 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Userland/Libraries/LibPDF/ColorSpace.cpp
View file

@ -293,17 +293,13 @@ constexpr Array<float, 3> scale_black_point(Array<float, 3> blackpoint, Array<fl
} }
// https://en.wikipedia.org/wiki/Illuminant_D65 // https://en.wikipedia.org/wiki/Illuminant_D65
constexpr Array<float, 3> convert_to_d65(Array<float, 3> whitepoint, Array<float, 3> xyz) constexpr Array<float, 3> convert_to_d65(Array<float, 3> xyz)
{ {
constexpr float d65x = 0.95047f; constexpr float d65x = 0.95047f;
constexpr float d65y = 1.0f; constexpr float d65y = 1.0f;
constexpr float d65z = 1.08883f; constexpr float d65z = 1.08883f;
return { return { xyz[0] * d65x, xyz[1] * d65y, xyz[2] * d65z };
(xyz[0] * d65x) / whitepoint[0],
(xyz[1] * d65y) / whitepoint[1],
(xyz[2] * d65z) / whitepoint[2],
};
} }
// https://en.wikipedia.org/wiki/SRGB // https://en.wikipedia.org/wiki/SRGB
@ -343,7 +339,7 @@ PDFErrorOr<Color> CalRGBColorSpace::color(ReadonlySpan<Value> arguments) const
auto flattened_xyz = flatten_and_normalize_whitepoint(m_whitepoint, { x, y, z }); auto flattened_xyz = flatten_and_normalize_whitepoint(m_whitepoint, { x, y, z });
auto scaled_black_point_xyz = scale_black_point(m_blackpoint, flattened_xyz); auto scaled_black_point_xyz = scale_black_point(m_blackpoint, flattened_xyz);
auto d65_normalized = convert_to_d65(m_whitepoint, scaled_black_point_xyz); auto d65_normalized = convert_to_d65(scaled_black_point_xyz);
auto srgb = convert_to_srgb(d65_normalized); auto srgb = convert_to_srgb(d65_normalized);
auto red = static_cast<u8>(srgb[0] * 255.0f); auto red = static_cast<u8>(srgb[0] * 255.0f);