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#include <gdk/gdk.h>
#include "hsla.h"
void
_gdk_hsla_init_from_rgba (GdkHSLA *hsla,
const GdkRGBA *rgba)
{
float min;
float max;
float red;
float green;
float blue;
float delta;
g_return_if_fail (hsla != NULL);
g_return_if_fail (rgba != NULL);
red = rgba->red;
green = rgba->green;
blue = rgba->blue;
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;
}
hsla->lightness = (max + min) / 2;
hsla->saturation = 0;
hsla->hue = 0;
hsla->alpha = rgba->alpha;
if (max != min)
{
if (hsla->lightness <= 0.5)
hsla->saturation = (max - min) / (max + min);
else
hsla->saturation = (max - min) / (2 - max - min);
delta = max -min;
if (red == max)
hsla->hue = (green - blue) / delta;
else if (green == max)
hsla->hue = 2 + (blue - red) / delta;
else if (blue == max)
hsla->hue = 4 + (red - green) / delta;
hsla->hue *= 60;
if (hsla->hue < 0.0)
hsla->hue += 360;
}
}
void
_gdk_rgba_init_from_hsla (GdkRGBA *rgba,
const GdkHSLA *hsla)
{
float hue;
float lightness;
float saturation;
float m1, m2;
lightness = hsla->lightness;
saturation = hsla->saturation;
if (lightness <= 0.5)
m2 = lightness * (1 + saturation);
else
m2 = lightness + saturation - lightness * saturation;
m1 = 2 * lightness - m2;
rgba->alpha = hsla->alpha;
if (saturation == 0)
{
rgba->red = lightness;
rgba->green = lightness;
rgba->blue = lightness;
}
else
{
hue = hsla->hue + 120;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
rgba->red = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
rgba->red = m2;
else if (hue < 240)
rgba->red = m1 + (m2 - m1) * (240 - hue) / 60;
else
rgba->red = m1;
hue = hsla->hue;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
rgba->green = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
rgba->green = m2;
else if (hue < 240)
rgba->green = m1 + (m2 - m1) * (240 - hue) / 60;
else
rgba->green = m1;
hue = hsla->hue - 120;
while (hue > 360)
hue -= 360;
while (hue < 0)
hue += 360;
if (hue < 60)
rgba->blue = m1 + (m2 - m1) * hue / 60;
else if (hue < 180)
rgba->blue = m2;
else if (hue < 240)
rgba->blue = m1 + (m2 - m1) * (240 - hue) / 60;
else
rgba->blue = m1;
}
}
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