mirror of https://github.com/GNOME/gimp.git
226 lines
8.7 KiB
C
226 lines
8.7 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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* <http://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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#define GIMP_VALUE_HOLDS_RGB(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_RGB))
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GType gimp_rgb_get_type (void) G_GNUC_CONST;
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void gimp_value_get_rgb (const GValue *value,
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GimpRGB *rgb);
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void gimp_value_set_rgb (GValue *value,
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const GimpRGB *rgb);
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/*
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* GIMP_TYPE_PARAM_RGB
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*/
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#define GIMP_TYPE_PARAM_RGB (gimp_param_rgb_get_type ())
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#define GIMP_IS_PARAM_SPEC_RGB(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_RGB))
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GType gimp_param_rgb_get_type (void) G_GNUC_CONST;
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GParamSpec * gimp_param_spec_rgb (const gchar *name,
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const gchar *nick,
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const gchar *blurb,
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gboolean has_alpha,
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const GimpRGB *default_value,
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GParamFlags flags);
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gboolean gimp_param_spec_rgb_has_alpha (GParamSpec *pspec);
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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 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_pixel (GimpRGB *rgb,
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const Babl *format,
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gconstpointer pixel);
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void gimp_rgb_get_pixel (const GimpRGB *rgb,
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const Babl *format,
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gpointer pixel);
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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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gboolean gimp_rgb_parse_name (GimpRGB *rgb,
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const gchar *name,
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gint len);
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gboolean gimp_rgb_parse_hex (GimpRGB *rgb,
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const gchar *hex,
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gint len);
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gboolean gimp_rgb_parse_css (GimpRGB *rgb,
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const gchar *css,
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gint len);
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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_luminance (const GimpRGB *rgb);
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guchar gimp_rgb_luminance_uchar (const GimpRGB *rgb);
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GIMP_DEPRECATED_FOR(gimp_rgb_luminance)
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gdouble gimp_rgb_intensity (const GimpRGB *rgb);
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GIMP_DEPRECATED_FOR(gimp_rgb_luminance_uchar)
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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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/* access to the list of color names */
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gint gimp_rgb_list_names (const gchar ***names,
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GimpRGB **colors);
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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_pixel (GimpRGB *rgba,
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const Babl *format,
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gconstpointer pixel);
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void gimp_rgba_get_pixel (const GimpRGB *rgba,
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const Babl *format,
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gpointer pixel);
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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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gboolean gimp_rgba_parse_css (GimpRGB *rgba,
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const gchar *css,
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gint len);
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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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/*
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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 ITU-R Recommendation BT.709, "Basic
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* Parameter Values for the HDTV Standard for the Studio and for
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* International Programme Exchange" (1990). Also suggested in the
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* sRGB colorspace specification by the W3C.
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*/
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#define GIMP_RGB_LUMINANCE_RED (0.2126)
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#define GIMP_RGB_LUMINANCE_GREEN (0.7152)
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#define GIMP_RGB_LUMINANCE_BLUE (0.0722)
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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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#ifndef GIMP_DISABLE_DEPRECATED
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/*
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* The coefficients below properly computed luminance for monitors
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* having phosphors that were contemporary at the introduction of NTSC
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* television in 1953. They are still appropriate for computing video
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* luma. However, these coefficients do not accurately compute
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* luminance for contemporary monitors. The use of these definitions
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* is deprecated.
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*/
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#define GIMP_RGB_INTENSITY_RED (0.30)
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#define GIMP_RGB_INTENSITY_GREEN (0.59)
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#define GIMP_RGB_INTENSITY_BLUE (0.11)
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#define GIMP_RGB_INTENSITY(r,g,b) ((r) * GIMP_RGB_INTENSITY_RED + \
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(g) * GIMP_RGB_INTENSITY_GREEN + \
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(b) * GIMP_RGB_INTENSITY_BLUE)
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#endif
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G_END_DECLS
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#endif /* __GIMP_RGB_H__ */
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