mirror of https://github.com/GNOME/gimp.git
117 lines
3.6 KiB
C
117 lines
3.6 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 2 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GIMP_RGB_H__
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#define __GIMP_RGB_H__
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* For information look into the C source or the html documentation */
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/* RGB and RGBA color types and operations taken from LibGCK */
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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 r,
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gdouble g,
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gdouble b);
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void gimp_rgb_set_alpha (GimpRGB *rgb,
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gdouble a);
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void gimp_rgb_set_uchar (GimpRGB *rgb,
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guchar r,
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guchar g,
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guchar b);
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void gimp_rgb_get_uchar (const GimpRGB *rgb,
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guchar *r,
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guchar *g,
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guchar *b);
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void gimp_rgb_add (GimpRGB *rgb1,
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const GimpRGB *rgb2);
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void gimp_rgb_subtract (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_distance (const GimpRGB *rgb1,
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const GimpRGB *rgb2);
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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_gamma (GimpRGB *rgb,
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gdouble gamma);
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gdouble gimp_rgb_intensity (const GimpRGB *rgb);
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guchar gimp_rgb_intensity_uchar (const 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 r,
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gdouble g,
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gdouble b,
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gdouble a);
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void gimp_rgba_set_uchar (GimpRGB *rgba,
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guchar r,
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guchar g,
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guchar b,
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guchar a);
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void gimp_rgba_get_uchar (const GimpRGB *rgba,
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guchar *r,
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guchar *g,
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guchar *b,
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guchar *a);
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void gimp_rgba_add (GimpRGB *rgba1,
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const GimpRGB *rgba2);
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void gimp_rgba_subtract (GimpRGB *rgba1,
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const GimpRGB *rgba2);
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void gimp_rgba_multiply (GimpRGB *rgba,
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gdouble factor);
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gdouble gimp_rgba_distance (const GimpRGB *rgba1,
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const GimpRGB *rgba2);
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/* Map RGB to intensity */
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#define INTENSITY_RED 0.30
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#define INTENSITY_GREEN 0.59
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#define INTENSITY_BLUE 0.11
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#define INTENSITY(r,g,b) ((r) * INTENSITY_RED + \
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(g) * INTENSITY_GREEN + \
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(b) * INTENSITY_BLUE + 0.001)
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GIMP_RGB_H__ */
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