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Update dCommon/NiColor.h

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
Aaron Kimbrell
2026-03-20 13:19:03 -05:00
committed by GitHub
parent 705a9ab236
commit b50e9d9339
1 changed files with 25 additions and 25 deletions
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50
dCommon/NiColor.h
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@@ -2,33 +2,33 @@
#define NICOLOR_H #define NICOLOR_H
struct NiColor { struct NiColor {
float m_Red; float m_Red;
float m_Green; float m_Green;
float m_Blue; float m_Blue;
NiColor(float red, float green, float blue) : m_Red(red), m_Green(green), m_Blue(blue) {} NiColor(float red, float green, float blue) : m_Red(red), m_Green(green), m_Blue(blue) {}
NiColor() : NiColor(0.0f, 0.0f, 0.0f) {} NiColor() : NiColor(0.0f, 0.0f, 0.0f) {}
/* reduce RGB files to grayscale, with or without alpha /* reduce RGB files to grayscale, with or without alpha
* using the equation given in Poynton's ColorFAQ at * using the equation given in Poynton's ColorFAQ at
* <http://www.inforamp.net/~poynton/> // dead link * <http://www.inforamp.net/~poynton/> // dead link
* Copyright (c) 1998-01-04 Charles Poynton poynton at inforamp.net * Copyright (c) 1998-01-04 Charles Poynton poynton at inforamp.net
* *
* Y = 0.212671 * R + 0.715160 * G + 0.072169 * B * Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
* *
* We approximate this with * We approximate this with
* *
* Y = 0.21268 * R + 0.7151 * G + 0.07217 * B * Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
* *
* which can be expressed with integers as * which can be expressed with integers as
* *
* Y = (6969 * R + 23434 * G + 2365 * B)/32768 * Y = (6969 * R + 23434 * G + 2365 * B)/32768
* *
* The calculation is to be done in a linear colorspace. * The calculation is to be done in a linear colorspace.
* *
* Other integer coefficents can be used via png_set_rgb_to_gray(). * 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); }; float ToXYZ() const { return (m_Red * 0.212671f) + (m_Green * 0.71516f) + (m_Blue * 0.072169f); };
}; };
#endif // NICOLOR_H #endif // NICOLOR_H