export function makeWatermarkShader()

in packages/core/src/canvas/watermark-shader.ts [10:36]

• 25 lines of code
• 2 McCabe index (conditional complexity)

export function makeWatermarkShader(text: string, bounds = WATERMARK_BOUNDS) {
  if (cache[text]) {
    return cache[text]
  }

  const options = { width: bounds.width, height: bounds.height }

  const context = PlatformAdapter.createRenderingContext(options.width, options.height)
  assert(context)
  context.beginPath()
  context.setLineDash([20, 3, 3, 3, 3, 3, 3, 3])
  context.moveTo(bounds.left, bounds.top)
  context.lineTo(bounds.width, bounds.height)
  context.moveTo(bounds.width, bounds.top)
  context.lineTo(bounds.left, bounds.height)
  context.closePath()
  context.strokeStyle = 'rgba(0, 0, 0, 0.1)'
  context.stroke()
  context.fillStyle = 'rgba(0, 0, 0, 0.2)'
  context.textAlign = 'center'
  context.textBaseline = 'middle'
  context.font = '16px Monospace'
  context.fillText(text, bounds.width / 2, bounds.height / 2)
  const pattern = context.createPattern(context.canvas, 'repeat')
  assert(pattern)
  return cache[text] = Shader.fromPattern(pattern)
}