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fix: revert changes to hsb_to_rgb

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Kellen 2021-10-22 12:35:47 -07:00
parent dddb9e7042
commit 20ad9ea98d
1 changed files with 29 additions and 37 deletions
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66
app/src/rgb_underglow.c
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@ -68,60 +68,52 @@ static struct zmk_led_hsb hsb_scale_zero_max(struct zmk_led_hsb hsb) {
return hsb; return hsb;
} }
// Conversion algorithm taken from https://en.wikipedia.org/wiki/HSL_and_HSV#HSV_to_RGB
static struct led_rgb hsb_to_rgb(struct zmk_led_hsb hsb) { static struct led_rgb hsb_to_rgb(struct zmk_led_hsb hsb) {
struct led_rgb rgb; double r, g, b;
uint32_t from_h = hsb.h; uint8_t i = hsb.h / 60;
uint32_t from_s = hsb.s; double v = hsb.b / ((float)BRT_MAX);
uint32_t from_b = hsb.b; double s = hsb.s / ((float)SAT_MAX);
double f = hsb.h / ((float)HUE_MAX) * 6 - i;
double p = v * (1 - s);
double q = v * (1 - f * s);
double t = v * (1 - (1 - f) * s);
// Scale brightness from [0-100] to [0-255] switch (i % 6) {
uint32_t max_brightness = from_b * 2.55f;
uint32_t min_brightness = from_b * (100 - from_s) * 0.0255f;
uint32_t sector = from_h / 60;
uint32_t distance_into_sector = sector % 60;
uint32_t offset = (max_brightness - min_brightness) * distance_into_sector / 60;
switch (sector) {
case 0: case 0:
rgb.r = max_brightness; r = v;
rgb.g = min_brightness + offset; g = t;
rgb.b = min_brightness; b = p;
break; break;
case 1: case 1:
rgb.r = max_brightness - offset; r = q;
rgb.g = max_brightness; g = v;
rgb.b = min_brightness; b = p;
break; break;
case 2: case 2:
rgb.r = min_brightness; r = p;
rgb.g = max_brightness; g = v;
rgb.b = min_brightness + offset; b = t;
break; break;
case 3: case 3:
rgb.r = min_brightness; r = p;
rgb.g = max_brightness - offset; g = q;
rgb.b = max_brightness; b = v;
break; break;
case 4: case 4:
rgb.r = min_brightness + offset; r = t;
rgb.g = min_brightness; g = p;
rgb.b = max_brightness; b = v;
break; break;
case 5: case 5:
rgb.r = max_brightness; r = v;
rgb.g = min_brightness; g = p;
rgb.b = max_brightness - offset; b = q;
break;
default:
rgb.r = 0;
rgb.g = 0;
rgb.b = 0;
break; break;
} }
struct led_rgb rgb = {r : r * 255, g : g * 255, b : b * 255};
return rgb; return rgb;
} }