code: func DebugPrint(image *ebiten.Image, str string) error {
  	DebugPrintAt(image, str, 0, 0)
  	return nil
  }
docs: // DebugPrint draws the string str on the image on left top corner.
  //
  // The available runes are in U+0000 to U+00FF, which is C0 Controls and Basic Latin and C1 Controls and Latin-1 Supplement.
  //
  // DebugPrint always returns nil as of 1.5.0-alpha.