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zephr/ui: dynamically determine color picker buttons' text color and crosshairs selection's color

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Illusion
2024-01-09 01:13:01 +02:00
parent 080f2f1aa4
commit 12626a513e
7 changed files with 67 additions and 19 deletions
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zephr_math.c
+25
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@@ -1,5 +1,6 @@
#include <math.h>
#include "zephr.h"
#include "zephr_math.h"
float to_radians(float degrees) {
@@ -107,3 +108,27 @@ Color hsv2rgb(float h, float s, float v) {
return (Color){(u8)((r + m) * 255), (u8)((g + m) * 255), (u8)((b + m) * 255), 255};
}
f32 get_srgb(u8 c) {
return (f32)(c / 255.f <= 0.03928f
? c / 255.f / 12.92f
: pow((c / 255.f + 0.055f) / 1.055f, 2.4f));
}
f32 get_luminance(Color *color) {
return ((0.2126f * (f32)get_srgb(color->r)) + (0.7152f * (f32)get_srgb(color->g)) + (0.0722f * (f32)get_srgb(color->b))) / 255.f;
}
f32 get_contrast(Color *fg, Color *bg) {
f32 l1 = get_luminance(fg);
f32 l2 = get_luminance(bg);
return (CORE_MAX(l1, l2) + 0.05f) / (CORE_MIN(l1, l2) + 0.05f);
}
Color determine_color_contrast(Color *bg) {
f32 white_contrast = get_contrast(bg, &COLOR_WHITE);
f32 black_contrast = get_contrast(bg, &COLOR_BLACK);
return white_contrast > black_contrast ? COLOR_WHITE : COLOR_BLACK;
}