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chore: rename NiColor::ToXYZ to Luminance

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-10-16 11:13:19 -05:00
parent fc70efa503
commit db0bae76d0
1 changed files with 2 additions and 20 deletions
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22
dCommon/NiColor.h
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@@ -9,26 +9,8 @@ struct NiColor {
constexpr NiColor(float red, float green, float blue) : m_Red(red), m_Green(green), m_Blue(blue) {}
constexpr NiColor() : NiColor(0.0f, 0.0f, 0.0f) {}
/* reduce RGB files to grayscale, with or without alpha
* using the equation given in Poynton's ColorFAQ at
* <http://www.inforamp.net/~poynton/> // dead link
* Copyright (c) 1998-01-04 Charles Poynton poynton at inforamp.net
*
* Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
*
* We approximate this with
*
* Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
*
* which can be expressed with integers as
*
* Y = (6969 * R + 23434 * G + 2365 * B)/32768
*
* The calculation is to be done in a linear colorspace.
*
* Other integer coefficents can be used via png_set_rgb_to_gray().
*/
float ToXYZ() const { return (m_Red * 0.212671f) + (m_Green * 0.71516f) + (m_Blue * 0.072169f); };
// Relative luminance (Rec. 709 weights) of a linear color
constexpr float Luminance() const { return (m_Red * 0.212671f) + (m_Green * 0.71516f) + (m_Blue * 0.072169f); }
};
#endif // NICOLOR_H