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/* color.c: declarations for color handling.
Copyright (C) 2000, 2001, 2002 Martin Weber
The author can be contacted at <martweb@gmx.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* Def: HAVE_CONFIG_H */
#include "intl.h"
#include "color.h"
#include "exception.h"
#include <string.h>
#include <stdlib.h>
at_color *at_color_new(unsigned char r, unsigned char g, unsigned char b)
{
at_color *color;
color = g_new(at_color, 1);
color->r = r;
color->g = g;
color->b = b;
return color;
}
at_color *at_color_parse(const gchar * string, GError ** err)
{
GError *local_err = NULL;
unsigned char c[6];
int i;
if (!string)
return NULL;
else if (string[0] == '\0')
return NULL;
else if (strlen(string) != 6) {
g_set_error(err, AT_ERROR, AT_ERROR_WRONG_COLOR_STRING, _("color string is too short: %s"), string);
return NULL;
}
for (i = 0; i < 6; i++) {
char *endptr;
c[i] = (int)strtol(&string[i], &endptr, 16);
if (endptr == &string[i]) {
g_set_error(&local_err, AT_ERROR, AT_ERROR_WRONG_COLOR_STRING, _("wrong char in color string: %c"), string[i]);
g_propagate_error(err, local_err);
return NULL;
}
}
return at_color_new((unsigned char)(16 * c[0] + c[1]), (unsigned char)(16 * c[2] + c[3]), (unsigned char)(16 * c[4] + c[5]));
}
at_color *at_color_copy(const at_color * original)
{
if (original == NULL)
return NULL;
return at_color_new(original->r, original->g, original->b);
}
gboolean at_color_equal(const at_color * c1, const at_color * c2)
{
if (c1 == c2 || ((c1->r == c2->r) && (c1->g == c2->g) && (c1->b == c2->b)))
return TRUE;
return FALSE;
}
void at_color_set(at_color * c, unsigned char r, unsigned char g, unsigned char b)
{
g_return_if_fail(c);
c->r = r;
c->g = g;
c->b = b;
}
unsigned char at_color_luminance(const at_color * color)
{
return ((unsigned char)((color->r) * 0.30 + (color->g) * 0.59 + (color->b) * 0.11 + 0.5));
}
void at_color_free(at_color * color)
{
g_free(color);
}
GType at_color_get_type(void)
{
static GType our_type = 0;
if (our_type == 0)
our_type = g_boxed_type_register_static("AtColor", (GBoxedCopyFunc) at_color_copy, (GBoxedFreeFunc) at_color_free);
return our_type;
}
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