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color-util: make return values of rgb_to_hsv() optional

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When we want to tint the bg color we don't care about the hue, we want
to set it ourself after all, hence make the arguments optional, so that
we don't even have to ask for it.
This commit is contained in:
Lennart Poettering
2024-01-19 23:59:00 +01:00
parent 3d8ba7b83f
commit f9bc96f657
1 changed files with 22 additions and 19 deletions
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41
src/shared/color-util.c
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@@ -11,35 +11,38 @@ void rgb_to_hsv(double r, double g, double b,
assert(r >= 0 && r <= 1);
assert(g >= 0 && g <= 1);
assert(b >= 0 && b <= 1);
assert(ret_h);
assert(ret_s);
assert(ret_v);
double max_color = fmax(r, fmax(g, b));
double min_color = fmin(r, fmin(g, b));
double delta = max_color - min_color;
*ret_v = max_color * 100.0;
if (ret_v)
*ret_v = max_color * 100.0;
if (max_color > 0)
*ret_s = delta / max_color * 100.0;
else {
*ret_s = 0;
*ret_h = NAN;
if (max_color <= 0) {
if (ret_s)
*ret_s = 0;
if (ret_h)
*ret_h = NAN;
return;
}
if (delta > 0) {
if (r >= max_color)
*ret_h = 60 * fmod((g - b) / delta, 6);
else if (g >= max_color)
*ret_h = 60 * (((b - r) / delta) + 2);
else if (b >= max_color)
*ret_h = 60 * (((r - g) / delta) + 4);
if (ret_s)
*ret_s = delta / max_color * 100.0;
*ret_h = fmod(*ret_h, 360);
} else
*ret_h = NAN;
if (ret_h) {
if (delta > 0) {
if (r >= max_color)
*ret_h = 60 * fmod((g - b) / delta, 6);
else if (g >= max_color)
*ret_h = 60 * (((b - r) / delta) + 2);
else if (b >= max_color)
*ret_h = 60 * (((r - g) / delta) + 4);
*ret_h = fmod(*ret_h, 360);
} else
*ret_h = NAN;
}
}
void hsv_to_rgb(double h, double s, double v,