Function gray

packages/opencode/src/cli/cmd/run/theme.ts:335–364

(level: number)

  const cast = 0.25 * (1 - chroma(bg)) ** 2

  const gray = (level: number) => {
    const factor = level / 12

    if (isDark && lum < 10) {
      const value = Math.floor(factor * 0.4 * 255)
      return map(RGBA.fromInts(value, value, value))
    }

    if (!isDark && lum > 245) {
      const value = Math.floor(255 - factor * 0.4 * 255)
      return map(RGBA.fromInts(value, value, value))
    }

    const value = isDark ? lum + (255 - lum) * factor * 0.4 : lum * (1 - factor * 0.4)
    const tone = RGBA.fromInts(Math.floor(value), Math.floor(value), Math.floor(value))
    if (cast === 0) return map(tone)

    const ratio = lum === 0 ? 0 : value / lum
    return map(
      tint(
        tone,
        RGBA.fromInts(
          Math.floor(Math.max(0, Math.min(r * ratio, 255))),
          Math.floor(Math.max(0, Math.min(g * ratio, 255))),
          Math.floor(Math.max(0, Math.min(b * ratio, 255))),
        ),
        cast,
      ),
    )
  }

  return Object.fromEntries(Array.from({ length: 12 }, (_, index) => [index + 1, gray(index + 1)]))
}