add oklch color function support please

[oonxt]

got error:
Error: Attempting to parse an unsupported color function "oklch"
at Object.parse (dompdf__js.js?v=a93db034:2116:21)
at parseColor$1 (dompdf__js.js?v=a93db034:2233:24)
at parseBackgroundColor$1 (dompdf__js.js?v=a93db034:17017:56)
at dompdf__js.js?v=a93db034:16962:36
at step (dompdf__js.js?v=a93db034:132:23)
at Object.next (dompdf__js.js?v=a93db034:84:20)
at fulfilled (dompdf__js.js?v=a93db034:56:30) 'err'

[zvn2060]

I used AI to analyze the root cause:

because of below function, currently only support hex value and rgba()

dompdf.js/src/snapshot.ts

Lines 609 to 629 in f103473

	function parseColor(str: string | null | undefined): [number, number, number, number] {
	if (!colorCtx) return [0, 0, 0, 1];
	if (!str) return [0, 0, 0, 0];
	colorCtx.fillStyle = '#000';
	colorCtx.fillStyle = str;
	const f = colorCtx.fillStyle;
	if (typeof f === 'string' && f.startsWith('#')) {
	return [
	parseInt(f.slice(1, 3), 16) / 255,
	parseInt(f.slice(3, 5), 16) / 255,
	parseInt(f.slice(5, 7), 16) / 255,
	1,
	];
	}
	const m = /rgba?\(([^)]+)\)/.exec(f);
	if (m) {
	const p = m[1].split(',').map((s) => parseFloat(s));
	return [p[0] / 255, p[1] / 255, p[2] / 255, p[3] === undefined ? 1 : p[3]];
	}
	return [0, 0, 0, 0];
	}

It should modify to this implementation in below, which support other function: oklch(), hsl()...

function parseColor(str) {
    if (!colorCtx) return [0, 0, 0, 1];
    if (!str) return [0, 0, 0, 0];
    colorCtx.clearRect(0, 0, 1, 1);
    colorCtx.fillStyle = '#000';
    colorCtx.fillStyle = str;
    colorCtx.fillRect(0, 0, 1, 1);
    const [r, g, b, a] = colorCtx.getImageData(0, 0, 1, 1).data;
    return [r / 255, g / 255, b / 255, a / 255];
}