Function brighten

src/renderers/createHighlightRenderer.ts:54–57

(rgba: readonly [number, number, number, number], factor: number)

  Number.isFinite(s.x) && Number.isFinite(s.y) && Number.isFinite(s.w) && Number.isFinite(s.h);

const brighten = (rgba: readonly [number, number, number, number], factor: number): readonly [number, number, number, number] => {
  const f = Number.isFinite(factor) ? factor : 1;
  return [clamp01(rgba[0] * f), clamp01(rgba[1] * f), clamp01(rgba[2] * f), clamp01(rgba[3])] as const;
};

const luminance = (rgba: readonly [number, number, number, number]): number =>
  0.2126 * rgba[0] + 0.7152 * rgba[1] + 0.0722 * rgba[2];