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/* vim: set ts=8 sw=8 noexpandtab: */
/* The Cairo CSS Drawing Library.
* Copyright (C) 2008 Robert Staudinger
*
* Portions of this file are derived from gtkrc.c, licensed under
* the GNU Lesser General Public License; either version 2 of the
* License, or (at your option) any later version. Copyright (C)
* the GTK+ Team, see the ChangeLog at ftp://ftp.gtk.org/pub/gtk/.
*
* 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
* Lesser 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., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <stdbool.h>
#include <gtk/gtk.h>
#include "ccss-gtk-color.h"
#include "config.h"
bool
ccss_gtk_color_lookup (char const *spec,
GdkColor *color)
{
GtkSettings *settings;
GHashTable *colors;
GdkColor *system_color;
g_return_val_if_fail (spec, false);
settings = gtk_settings_get_default ();
colors = NULL;
g_object_get (G_OBJECT (settings), "color-hash", &colors, NULL);
g_return_val_if_fail (colors, false);
system_color = (GdkColor *) g_hash_table_lookup (colors, spec);
if (system_color) {
color->red = system_color->red;
color->green = system_color->green;
color->blue = system_color->blue;
return true;
}
/* Try to parse the color. */
return gdk_color_parse (spec, color);
}
static void
rgb_to_hls (gdouble *r,
gdouble *g,
gdouble *b)
{
gdouble min;
gdouble max;
gdouble red;
gdouble green;
gdouble blue;
gdouble h, l, s;
gdouble delta;
red = *r;
green = *g;
blue = *b;
if (red > green)
{
if (red > blue)
max = red;
else
max = blue;
if (green < blue)
min = green;
else
min = blue;
}
else
{
if (green > blue)
max = green;
else
max = blue;
if (red < blue)
min = red;
else
min = blue;
}
l = (max + min) / 2;
s = 0;
h = 0;
if (max != min)
{
if (l <= 0.5)
s = (max - min) / (max + min);
else
s = (max - min) / (2 - max - min);
delta = max -min;
if (red == max)
h = (green - blue) / delta;
else if (green == max)
h = 2 + (blue - red) / delta;
else if (blue == max)
h = 4 + (red - green) / delta;
h *= 60;
if (h < 0.0)
h += 360;
}
*r = h;
*g = l;
*b = s;
}
static void
hls_to_rgb (gdouble *h,
gdouble *l,
gdouble *s)
{
gdouble hue;
gdouble lightness;
gdouble saturation;
gdouble m1, m2;
gdouble r, g, b;
lightness = *l;
saturation = *s;
if (lightness <= 0.5)
m2 = lightness * (1 + saturation);
else
m2 = lightness + saturation - lightness * saturation;
m1 = 2 * lightness - m2;
if (saturation == 0)
{
*h = lightness;
*l = lightness;
*s = lightness;
}
else
{
hue = *h + 120;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
r = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
r = m2;
else if (hue < 240)
r = m1 + (m2 - m1) * (240 - hue) / 60;
else
r = m1;
hue = *h;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
g = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
g = m2;
else if (hue < 240)
g = m1 + (m2 - m1) * (240 - hue) / 60;
else
g = m1;
hue = *h - 120;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
b = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
b = m2;
else if (hue < 240)
b = m1 + (m2 - m1) * (240 - hue) / 60;
else
b = m1;
*h = r;
*l = g;
*s = b;
}
}
bool
ccss_gtk_color_mix (double factor,
GdkColor const *color1,
GdkColor const *color2,
GdkColor *result)
{
result->red = factor * color1->red + (1.0 - factor) * color2->red;
result->green = factor * color1->green + (1.0 - factor) * color2->green;
result->blue = factor * color1->blue + (1.0 - factor) * color2->blue;
return true;
}
bool
ccss_gtk_color_shade (double factor,
GdkColor *color)
{
gdouble red;
gdouble green;
gdouble blue;
red = (gdouble) color->red / 65535.0;
green = (gdouble) color->green / 65535.0;
blue = (gdouble) color->blue / 65535.0;
rgb_to_hls (&red, &green, &blue);
green *= factor;
if (green > 1.0)
green = 1.0;
else if (green < 0.0)
green = 0.0;
blue *= factor;
if (blue > 1.0)
blue = 1.0;
else if (blue < 0.0)
blue = 0.0;
hls_to_rgb (&red, &green, &blue);
color->red = (guint16) (red * 65535.0);
color->green = (guint16) (green * 65535.0);
color->blue = (guint16) (blue * 65535.0);
return true;
}
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