/** Get device pixel ratio, clamped to reasonable range. */
export function getDpr(): number {
  if (typeof window === 'undefined') return 1
  return Math.min(window.devicePixelRatio || 1, 3)
}

/** Apply DPR scaling to canvas context. */
export function applyDpr(
  ctx: CanvasRenderingContext2D,
  dpr: number,
  w: number,
  h: number,
) {
  ctx.setTransform(dpr, 0, 0, dpr, 0, 0)
  ctx.clearRect(0, 0, w, h)
}