mirror of https://github.com/GNOME/gimp.git
129 lines
4.6 KiB
C
129 lines
4.6 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* This library is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#if !defined (__GIMP_COLOR_H_INSIDE__) && !defined (GIMP_COLOR_COMPILATION)
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#error "Only <libgimpcolor/gimpcolor.h> can be included directly."
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#endif
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#ifndef __GIMP_RGB_H__
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#define __GIMP_RGB_H__
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G_BEGIN_DECLS
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/* For information look into the C source or the html documentation */
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/*
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* GIMP_TYPE_RGB
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*/
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#define GIMP_TYPE_RGB (gimp_rgb_get_type ())
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GType gimp_rgb_get_type (void) G_GNUC_CONST;
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/* RGB and RGBA color types and operations taken from LibGCK */
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/**
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* GimpRGBCompositeMode:
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* @GIMP_RGB_COMPOSITE_NONE: don't do compositing
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* @GIMP_RGB_COMPOSITE_NORMAL: composite on top
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* @GIMP_RGB_COMPOSITE_BEHIND: composite behind
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**/
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typedef enum
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{
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GIMP_RGB_COMPOSITE_NONE = 0,
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GIMP_RGB_COMPOSITE_NORMAL,
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GIMP_RGB_COMPOSITE_BEHIND
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} GimpRGBCompositeMode;
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void gimp_rgb_set (GimpRGB *rgb,
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gdouble red,
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gdouble green,
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gdouble blue);
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void gimp_rgb_set_alpha (GimpRGB *rgb,
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gdouble alpha);
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void gimp_rgb_set_uchar (GimpRGB *rgb,
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guchar red,
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guchar green,
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guchar blue);
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void gimp_rgb_get_uchar (const GimpRGB *rgb,
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guchar *red,
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guchar *green,
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guchar *blue);
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void gimp_rgb_add (GimpRGB *rgb1,
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const GimpRGB *rgb2);
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void gimp_rgb_multiply (GimpRGB *rgb1,
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gdouble factor);
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gdouble gimp_rgb_max (const GimpRGB *rgb);
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gdouble gimp_rgb_min (const GimpRGB *rgb);
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void gimp_rgb_clamp (GimpRGB *rgb);
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void gimp_rgb_composite (GimpRGB *color1,
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const GimpRGB *color2,
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GimpRGBCompositeMode mode);
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void gimp_rgba_set (GimpRGB *rgba,
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gdouble red,
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gdouble green,
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gdouble blue,
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gdouble alpha);
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void gimp_rgba_set_uchar (GimpRGB *rgba,
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guchar red,
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guchar green,
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guchar blue,
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guchar alpha);
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void gimp_rgba_get_uchar (const GimpRGB *rgba,
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guchar *red,
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guchar *green,
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guchar *blue,
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guchar *alpha);
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gdouble gimp_rgba_distance (const GimpRGB *rgba1,
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const GimpRGB *rgba2);
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/* Map D50-adapted sRGB to luminance */
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/*
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* The weights to compute true CIE luminance from linear red, green
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* and blue as defined by the sRGB color space specs in an ICC profile
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* color managed application. The weights below have been chromatically
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* adapted from D65 (as specified by the sRGB color space specs)
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* to D50 (as specified by D50 illuminant values in the ICC V4 specs).
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*/
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#define GIMP_RGB_LUMINANCE_RED (0.22248840)
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#define GIMP_RGB_LUMINANCE_GREEN (0.71690369)
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#define GIMP_RGB_LUMINANCE_BLUE (0.06060791)
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#define GIMP_RGB_LUMINANCE(r,g,b) ((r) * GIMP_RGB_LUMINANCE_RED + \
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(g) * GIMP_RGB_LUMINANCE_GREEN + \
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(b) * GIMP_RGB_LUMINANCE_BLUE)
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G_END_DECLS
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#endif /* __GIMP_RGB_H__ */
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