code: func (dc *Context) SetHexColor(x string) {
  	r, g, b, a := parseHexColor(x)
  	dc.SetRGBA255(r, g, b, a)
  }
docs: // SetHexColor sets the current color using a hex string. The leading pound
  // sign (#) is optional. Both 3- and 6-digit variations are supported. 8 digits
  // may be provided to set the alpha value as well.