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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | 3x 3x 3x 3x 3x 3x 1122x 1122x 1101x 21x 63x 21x 21x 21x 21x | import Solver from "3x3-equation-solver";
import { hexDec } from "shared/lib/helpers/8bit";
import clamp from "shared/lib/helpers/clamp";
const rgbToGBCCache: Record<string, string> = {};
/**
* Convert hex to closest GBC compatible hex
*/
export const GBCHexToClosestHex = (hex: string) => {
Iif (hex.toLowerCase() === "ff0000") return hex; // otherwise comes back as 31,3,0
const r = Math.floor(hexDec(hex.substring(0, 2)));
const g = Math.floor(hexDec(hex.substring(2, 4)));
const b = Math.floor(hexDec(hex.substring(4)));
return rgbToClosestGBCHex(r, g, b);
};
/**
* Convert rgb values to closest GBC compatible hex
*/
export const rgbToClosestGBCHex = (r: number, g: number, b: number): string => {
const key = `${r}_${g}_${b}`;
if (rgbToGBCCache[key]) {
return rgbToGBCCache[key];
}
const clamp31 = (value: number) => {
return clamp(value, 0, 31);
};
const [r2, g2, b2] = Solver([
[13, 2, 1, r << 1],
[0, 3, 1, g >> 1],
[3, 2, 11, b << 1],
]);
const hex = (
(Math.round(255 * (clamp31(r2) / 31)) << 16) +
(Math.round(255 * (clamp31(g2) / 31)) << 8) +
Math.round(255 * (clamp31(b2) / 31))
)
.toString(16)
.padStart(6, "0");
rgbToGBCCache[key] = hex;
return hex;
};
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