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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GIMP_RGB_H__
#define __GIMP_RGB_H__
G_BEGIN_DECLS
/* For information look into the C source or the html documentation */
/*
* GIMP_TYPE_RGB
*/
#define GIMP_TYPE_RGB (gimp_rgb_get_type ())
#define GIMP_VALUE_HOLDS_RGB(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_RGB))
GType gimp_rgb_get_type (void) G_GNUC_CONST;
void gimp_value_get_rgb (const GValue *value,
GimpRGB *rgb);
void gimp_value_set_rgb (GValue *value,
const GimpRGB *rgb);
/*
* GIMP_TYPE_PARAM_RGB
*/
#define GIMP_TYPE_PARAM_RGB (gimp_param_rgb_get_type ())
#define GIMP_IS_PARAM_SPEC_RGB(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_RGB))
GType gimp_param_rgb_get_type (void) G_GNUC_CONST;
GParamSpec * gimp_param_spec_rgb (const gchar *name,
const gchar *nick,
const gchar *blurb,
gboolean has_alpha,
const GimpRGB *default_value,
GParamFlags flags);
gboolean gimp_param_spec_rgb_has_alpha (GParamSpec *pspec);
/* RGB and RGBA color types and operations taken from LibGCK */
typedef enum
{
GIMP_RGB_COMPOSITE_NONE = 0,
GIMP_RGB_COMPOSITE_NORMAL,
GIMP_RGB_COMPOSITE_BEHIND
} GimpRGBCompositeMode;
void gimp_rgb_set (GimpRGB *rgb,
gdouble red,
gdouble green,
gdouble blue);
void gimp_rgb_set_alpha (GimpRGB *rgb,
gdouble alpha);
void gimp_rgb_set_uchar (GimpRGB *rgb,
guchar red,
guchar green,
guchar blue);
void gimp_rgb_get_uchar (const GimpRGB *rgb,
guchar *red,
guchar *green,
guchar *blue);
gboolean gimp_rgb_parse_name (GimpRGB *rgb,
const gchar *name,
gint len);
gboolean gimp_rgb_parse_hex (GimpRGB *rgb,
const gchar *hex,
gint len);
gboolean gimp_rgb_parse_css (GimpRGB *rgb,
const gchar *css,
gint len);
void gimp_rgb_add (GimpRGB *rgb1,
const GimpRGB *rgb2);
void gimp_rgb_subtract (GimpRGB *rgb1,
const GimpRGB *rgb2);
void gimp_rgb_multiply (GimpRGB *rgb1,
gdouble factor);
gdouble gimp_rgb_distance (const GimpRGB *rgb1,
const GimpRGB *rgb2);
gdouble gimp_rgb_max (const GimpRGB *rgb);
gdouble gimp_rgb_min (const GimpRGB *rgb);
void gimp_rgb_clamp (GimpRGB *rgb);
void gimp_rgb_gamma (GimpRGB *rgb,
gdouble gamma);
gdouble gimp_rgb_luminance (const GimpRGB *rgb);
guchar gimp_rgb_luminance_uchar (const GimpRGB *rgb);
#ifndef GIMP_DISABLE_DEPRECATED
gdouble gimp_rgb_intensity (const GimpRGB *rgb);
guchar gimp_rgb_intensity_uchar (const GimpRGB *rgb);
#endif
void gimp_rgb_composite (GimpRGB *color1,
const GimpRGB *color2,
GimpRGBCompositeMode mode);
/* access to the list of color names */
gint gimp_rgb_list_names (const gchar ***names,
GimpRGB **colors);
void gimp_rgba_set (GimpRGB *rgba,
gdouble red,
gdouble green,
gdouble blue,
gdouble alpha);
void gimp_rgba_set_uchar (GimpRGB *rgba,
guchar red,
guchar green,
guchar blue,
guchar alpha);
void gimp_rgba_get_uchar (const GimpRGB *rgba,
guchar *red,
guchar *green,
guchar *blue,
guchar *alpha);
gboolean gimp_rgba_parse_css (GimpRGB *rgba,
const gchar *css,
gint len);
void gimp_rgba_add (GimpRGB *rgba1,
const GimpRGB *rgba2);
void gimp_rgba_subtract (GimpRGB *rgba1,
const GimpRGB *rgba2);
void gimp_rgba_multiply (GimpRGB *rgba,
gdouble factor);
gdouble gimp_rgba_distance (const GimpRGB *rgba1,
const GimpRGB *rgba2);
/* Map RGB to intensity */
/*
* The weights to compute true CIE luminance from linear red, green
* and blue, as defined by the ITU-R Recommendation BT.709, "Basic
* Parameter Values for the HDTV Standard for the Studio and for
* International Programme Exchange" (1990). Also suggested in the
* sRGB colorspace specification by the W3C.
*/
#define GIMP_RGB_LUMINANCE_RED (0.2126)
#define GIMP_RGB_LUMINANCE_GREEN (0.7152)
#define GIMP_RGB_LUMINANCE_BLUE (0.0722)
#define GIMP_RGB_LUMINANCE(r,g,b) ((r) * GIMP_RGB_LUMINANCE_RED + \
(g) * GIMP_RGB_LUMINANCE_GREEN + \
(b) * GIMP_RGB_LUMINANCE_BLUE)
#ifndef GIMP_DISABLE_DEPRECATED
/*
* The coefficients below properly computed luminance for monitors
* having phosphors that were contemporary at the introduction of NTSC
* television in 1953. They are still appropriate for computing video
* luma. However, these coefficients do not accurately compute
* luminance for contemporary monitors. The use of these definitions
* is deprecated.
*/
#define GIMP_RGB_INTENSITY_RED (0.30)
#define GIMP_RGB_INTENSITY_GREEN (0.59)
#define GIMP_RGB_INTENSITY_BLUE (0.11)
#define GIMP_RGB_INTENSITY(r,g,b) ((r) * GIMP_RGB_INTENSITY_RED + \
(g) * GIMP_RGB_INTENSITY_GREEN + \
(b) * GIMP_RGB_INTENSITY_BLUE)
#endif
G_END_DECLS
#endif /* __GIMP_RGB_H__ */
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