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colorutils: Refactor hsv_to_rgb and fold into only caller

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Timm Bäder 2020-09-26 09:59:27 +02:00 committed by Matthias Clasen
parent 663ae67935
commit 8e9a810045
1 changed files with 57 additions and 81 deletions
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138
gtk/gtkcolorutils.c
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@ -34,80 +34,6 @@
#include "gtkcolorutils.h"
/* Converts from HSV to RGB */
static void
hsv_to_rgb (float *h,
float *s,
float *v)
{
float hue, saturation, value;
float f, p, q, t;
if (*s == 0.0)
{
*h = *v;
*s = *v;
*v = *v; /* heh */
}
else
{
hue = *h * 6.0;
saturation = *s;
value = *v;
if (hue == 6.0)
hue = 0.0;
f = hue - (int) hue;
p = value * (1.0 - saturation);
q = value * (1.0 - saturation * f);
t = value * (1.0 - saturation * (1.0 - f));
switch ((int) hue)
{
case 0:
*h = value;
*s = t;
*v = p;
break;
case 1:
*h = q;
*s = value;
*v = p;
break;
case 2:
*h = p;
*s = value;
*v = t;
break;
case 3:
*h = p;
*s = q;
*v = value;
break;
case 4:
*h = t;
*s = p;
*v = value;
break;
case 5:
*h = value;
*s = p;
*v = q;
break;
default:
g_assert_not_reached ();
}
}
}
/* Converts from RGB to HSV */
static void
rgb_to_hsv (float *r,
@ -201,20 +127,70 @@ void
gtk_hsv_to_rgb (float h, float s, float v,
float *r, float *g, float *b)
{
float hue;
float f, p;
int ihue;
g_return_if_fail (h >= 0.0 && h <= 1.0);
g_return_if_fail (s >= 0.0 && s <= 1.0);
g_return_if_fail (v >= 0.0 && v <= 1.0);
g_return_if_fail (r);
g_return_if_fail (g);
g_return_if_fail (b);
hsv_to_rgb (&h, &s, &v);
if (s == 0.0)
{
*r = v;
*g = v;
*b = v;
return;
}
if (r)
*r = h;
hue = h * 6.0;
if (g)
*g = s;
if (hue == 6.0)
hue = 0.0;
if (b)
*b = v;
ihue = (int)hue;
f = hue - ihue;
p = v * (1.0 - s);
if (ihue == 0)
{
*r = v;
*g = v * (1.0 - s * (1.0 - f));
*b = p;
}
else if (ihue == 1)
{
*r = v * (1.0 - s * f);
*g = v;
*b = p;
}
else if (ihue == 2)
{
*r = p;
*g = v;
*b = v * (1.0 - s * (1.0 - f));
}
else if (ihue == 3)
{
*r = p;
*g = v * (1.0 - s * f);
*b = v;
}
else if (ihue == 4)
{
*r = v * (1.0 - s * (1.0 - f));
*g = p;
*b = v;
}
else if (ihue == 5)
{
*r = v;
*g = p;
*b = v * (1.0 - s * f);
}
}
/**