/* LIBPIKA - The PIKA 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 3 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, see
* .
*/
#if !defined (__PIKA_COLOR_H_INSIDE__) && !defined (PIKA_COLOR_COMPILATION)
#error "Only can be included directly."
#endif
#ifndef __PIKA_RGB_H__
#define __PIKA_RGB_H__
G_BEGIN_DECLS
/* For information look into the C source or the html documentation */
/*
* PIKA_TYPE_RGB
*/
#define PIKA_TYPE_RGB (pika_rgb_get_type ())
#define PIKA_VALUE_HOLDS_RGB(value) (G_TYPE_CHECK_VALUE_TYPE ((value), PIKA_TYPE_RGB))
GType pika_rgb_get_type (void) G_GNUC_CONST;
void pika_value_get_rgb (const GValue *value,
PikaRGB *rgb);
void pika_value_set_rgb (GValue *value,
const PikaRGB *rgb);
/*
* PIKA_TYPE_PARAM_RGB
*/
#define PIKA_TYPE_PARAM_RGB (pika_param_rgb_get_type ())
#define PIKA_IS_PARAM_SPEC_RGB(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), PIKA_TYPE_PARAM_RGB))
typedef struct _PikaParamSpecRGB PikaParamSpecRGB;
GType pika_param_rgb_get_type (void) G_GNUC_CONST;
GParamSpec * pika_param_spec_rgb (const gchar *name,
const gchar *nick,
const gchar *blurb,
gboolean has_alpha,
const PikaRGB *default_value,
GParamFlags flags);
void pika_param_spec_rgb_get_default (GParamSpec *pspec,
PikaRGB *default_value);
gboolean pika_param_spec_rgb_has_alpha (GParamSpec *pspec);
/* RGB and RGBA color types and operations taken from LibGCK */
/**
* PikaRGBCompositeMode:
* @PIKA_RGB_COMPOSITE_NONE: don't do compositing
* @PIKA_RGB_COMPOSITE_NORMAL: composite on top
* @PIKA_RGB_COMPOSITE_BEHIND: composite behind
**/
typedef enum
{
PIKA_RGB_COMPOSITE_NONE = 0,
PIKA_RGB_COMPOSITE_NORMAL,
PIKA_RGB_COMPOSITE_BEHIND
} PikaRGBCompositeMode;
void pika_rgb_set (PikaRGB *rgb,
gdouble red,
gdouble green,
gdouble blue);
void pika_rgb_set_alpha (PikaRGB *rgb,
gdouble alpha);
void pika_rgb_set_pixel (PikaRGB *rgb,
const Babl *format,
gconstpointer pixel);
void pika_rgb_get_pixel (const PikaRGB *rgb,
const Babl *format,
gpointer pixel);
void pika_rgb_set_uchar (PikaRGB *rgb,
guchar red,
guchar green,
guchar blue);
void pika_rgb_get_uchar (const PikaRGB *rgb,
guchar *red,
guchar *green,
guchar *blue);
gboolean pika_rgb_parse_name (PikaRGB *rgb,
const gchar *name,
gint len);
gboolean pika_rgb_parse_hex (PikaRGB *rgb,
const gchar *hex,
gint len);
gboolean pika_rgb_parse_css (PikaRGB *rgb,
const gchar *css,
gint len);
void pika_rgb_add (PikaRGB *rgb1,
const PikaRGB *rgb2);
void pika_rgb_subtract (PikaRGB *rgb1,
const PikaRGB *rgb2);
void pika_rgb_multiply (PikaRGB *rgb1,
gdouble factor);
gdouble pika_rgb_distance (const PikaRGB *rgb1,
const PikaRGB *rgb2);
gdouble pika_rgb_max (const PikaRGB *rgb);
gdouble pika_rgb_min (const PikaRGB *rgb);
void pika_rgb_clamp (PikaRGB *rgb);
void pika_rgb_gamma (PikaRGB *rgb,
gdouble gamma);
gdouble pika_rgb_luminance (const PikaRGB *rgb);
guchar pika_rgb_luminance_uchar (const PikaRGB *rgb);
void pika_rgb_composite (PikaRGB *color1,
const PikaRGB *color2,
PikaRGBCompositeMode mode);
/* access to the list of color names */
void pika_rgb_list_names (const gchar ***names,
PikaRGB **colors,
gint *n_colors);
void pika_rgba_set (PikaRGB *rgba,
gdouble red,
gdouble green,
gdouble blue,
gdouble alpha);
void pika_rgba_set_pixel (PikaRGB *rgba,
const Babl *format,
gconstpointer pixel);
void pika_rgba_get_pixel (const PikaRGB *rgba,
const Babl *format,
gpointer pixel);
void pika_rgba_set_uchar (PikaRGB *rgba,
guchar red,
guchar green,
guchar blue,
guchar alpha);
void pika_rgba_get_uchar (const PikaRGB *rgba,
guchar *red,
guchar *green,
guchar *blue,
guchar *alpha);
gboolean pika_rgba_parse_css (PikaRGB *rgba,
const gchar *css,
gint len);
void pika_rgba_add (PikaRGB *rgba1,
const PikaRGB *rgba2);
void pika_rgba_subtract (PikaRGB *rgba1,
const PikaRGB *rgba2);
void pika_rgba_multiply (PikaRGB *rgba,
gdouble factor);
gdouble pika_rgba_distance (const PikaRGB *rgba1,
const PikaRGB *rgba2);
/* Map D50-adapted sRGB to luminance */
/*
* The weights to compute true CIE luminance from linear red, green
* and blue as defined by the sRGB color space specs in an ICC profile
* color managed application. The weights below have been chromatically
* adapted from D65 (as specified by the sRGB color space specs)
* to D50 (as specified by D50 illuminant values in the ICC V4 specs).
*/
#define PIKA_RGB_LUMINANCE_RED (0.22248840)
#define PIKA_RGB_LUMINANCE_GREEN (0.71690369)
#define PIKA_RGB_LUMINANCE_BLUE (0.06060791)
#define PIKA_RGB_LUMINANCE(r,g,b) ((r) * PIKA_RGB_LUMINANCE_RED + \
(g) * PIKA_RGB_LUMINANCE_GREEN + \
(b) * PIKA_RGB_LUMINANCE_BLUE)
G_END_DECLS
#endif /* __PIKA_RGB_H__ */