209 lines
8.3 KiB
C
209 lines
8.3 KiB
C
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/* LIBPIKA - The PIKA 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 (__PIKA_COLOR_H_INSIDE__) && !defined (PIKA_COLOR_COMPILATION)
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#error "Only <libpikacolor/pikacolor.h> can be included directly."
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#endif
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#ifndef __PIKA_RGB_H__
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#define __PIKA_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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* PIKA_TYPE_RGB
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*/
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#define PIKA_TYPE_RGB (pika_rgb_get_type ())
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#define PIKA_VALUE_HOLDS_RGB(value) (G_TYPE_CHECK_VALUE_TYPE ((value), PIKA_TYPE_RGB))
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GType pika_rgb_get_type (void) G_GNUC_CONST;
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void pika_value_get_rgb (const GValue *value,
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PikaRGB *rgb);
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void pika_value_set_rgb (GValue *value,
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const PikaRGB *rgb);
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/*
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* PIKA_TYPE_PARAM_RGB
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*/
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#define PIKA_TYPE_PARAM_RGB (pika_param_rgb_get_type ())
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#define PIKA_IS_PARAM_SPEC_RGB(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), PIKA_TYPE_PARAM_RGB))
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typedef struct _PikaParamSpecRGB PikaParamSpecRGB;
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GType pika_param_rgb_get_type (void) G_GNUC_CONST;
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GParamSpec * pika_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 PikaRGB *default_value,
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GParamFlags flags);
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void pika_param_spec_rgb_get_default (GParamSpec *pspec,
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PikaRGB *default_value);
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gboolean pika_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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/**
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* PikaRGBCompositeMode:
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* @PIKA_RGB_COMPOSITE_NONE: don't do compositing
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* @PIKA_RGB_COMPOSITE_NORMAL: composite on top
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* @PIKA_RGB_COMPOSITE_BEHIND: composite behind
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**/
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typedef enum
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{
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PIKA_RGB_COMPOSITE_NONE = 0,
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PIKA_RGB_COMPOSITE_NORMAL,
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PIKA_RGB_COMPOSITE_BEHIND
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} PikaRGBCompositeMode;
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void pika_rgb_set (PikaRGB *rgb,
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gdouble red,
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gdouble green,
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gdouble blue);
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void pika_rgb_set_alpha (PikaRGB *rgb,
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gdouble alpha);
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void pika_rgb_set_pixel (PikaRGB *rgb,
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const Babl *format,
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gconstpointer pixel);
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void pika_rgb_get_pixel (const PikaRGB *rgb,
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const Babl *format,
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gpointer pixel);
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void pika_rgb_set_uchar (PikaRGB *rgb,
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guchar red,
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guchar green,
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guchar blue);
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void pika_rgb_get_uchar (const PikaRGB *rgb,
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guchar *red,
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guchar *green,
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guchar *blue);
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gboolean pika_rgb_parse_name (PikaRGB *rgb,
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const gchar *name,
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gint len);
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gboolean pika_rgb_parse_hex (PikaRGB *rgb,
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const gchar *hex,
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gint len);
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gboolean pika_rgb_parse_css (PikaRGB *rgb,
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const gchar *css,
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gint len);
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void pika_rgb_add (PikaRGB *rgb1,
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const PikaRGB *rgb2);
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void pika_rgb_subtract (PikaRGB *rgb1,
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const PikaRGB *rgb2);
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void pika_rgb_multiply (PikaRGB *rgb1,
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gdouble factor);
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gdouble pika_rgb_distance (const PikaRGB *rgb1,
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const PikaRGB *rgb2);
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gdouble pika_rgb_max (const PikaRGB *rgb);
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gdouble pika_rgb_min (const PikaRGB *rgb);
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void pika_rgb_clamp (PikaRGB *rgb);
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void pika_rgb_gamma (PikaRGB *rgb,
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gdouble gamma);
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gdouble pika_rgb_luminance (const PikaRGB *rgb);
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guchar pika_rgb_luminance_uchar (const PikaRGB *rgb);
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void pika_rgb_composite (PikaRGB *color1,
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const PikaRGB *color2,
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PikaRGBCompositeMode mode);
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/* access to the list of color names */
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void pika_rgb_list_names (const gchar ***names,
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PikaRGB **colors,
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gint *n_colors);
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void pika_rgba_set (PikaRGB *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 pika_rgba_set_pixel (PikaRGB *rgba,
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const Babl *format,
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gconstpointer pixel);
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void pika_rgba_get_pixel (const PikaRGB *rgba,
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const Babl *format,
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gpointer pixel);
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void pika_rgba_set_uchar (PikaRGB *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 pika_rgba_get_uchar (const PikaRGB *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 pika_rgba_parse_css (PikaRGB *rgba,
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const gchar *css,
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gint len);
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void pika_rgba_add (PikaRGB *rgba1,
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const PikaRGB *rgba2);
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void pika_rgba_subtract (PikaRGB *rgba1,
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const PikaRGB *rgba2);
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void pika_rgba_multiply (PikaRGB *rgba,
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gdouble factor);
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gdouble pika_rgba_distance (const PikaRGB *rgba1,
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const PikaRGB *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 PIKA_RGB_LUMINANCE_RED (0.22248840)
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#define PIKA_RGB_LUMINANCE_GREEN (0.71690369)
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#define PIKA_RGB_LUMINANCE_BLUE (0.06060791)
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#define PIKA_RGB_LUMINANCE(r,g,b) ((r) * PIKA_RGB_LUMINANCE_RED + \
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(g) * PIKA_RGB_LUMINANCE_GREEN + \
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(b) * PIKA_RGB_LUMINANCE_BLUE)
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G_END_DECLS
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#endif /* __PIKA_RGB_H__ */
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