code: func (f *Fpdf) GetFillColor() (int, int, int) {
  	return f.color.fill.ir, f.color.fill.ig, f.color.fill.ib
  }
docs: // GetFillColor returns the most recently set fill color as RGB components (0 -
  // 255). This will not be the current value if a fill color of some other type
  // (for example, spot) has been more recently set.