func (gc *GraphicContext) SetFontData(fontData draw2d.FontData) {
	// TODO: call Makefont embed if json file does not exist yet
	gc.StackGraphicContext.SetFontData(fontData)
	var style string
	if fontData.Style&draw2d.FontStyleBold != 0 {
		style += "B"
	}
	if fontData.Style&draw2d.FontStyleItalic != 0 {
		style += "I"
	}
	fn := draw2d.FontFileName(fontData)
	fn = fn[:len(fn)-4]
	size, _ := gc.pdf.GetFontSize()
	gc.pdf.AddFont(fontData.Name, style, fn+".json")
	gc.pdf.SetFont(fontData.Name, style, size)
}
func (gc *GraphicContext) SetFontData(fontData draw2d.FontData) {
	// TODO: call Makefont embed if json file does not exist yet
	gc.StackGraphicContext.SetFontData(fontData)
	var style string
	if fontData.Style&draw2d.FontStyleBold != 0 {
		style += "B"
	}
	if fontData.Style&draw2d.FontStyleItalic != 0 {
		style += "I"
	}
	fn := draw2d.FontFileName(fontData)
	fn = fn[:len(fn)-4]
	size, _ := gc.pdf.GetFontSize()
	gc.pdf.AddFont(fontData.Name, style, fn+".json")
	gc.pdf.SetFont(fontData.Name, style, size)
}
// SetFontData sets the current font used to draw text. Always use
// this method, as SetFont is unsupported by the pdf graphic context.
// It is mandatory to call this method at least once before printing
// text or the resulting document will not be valid.
// It is necessary to generate a font definition file first with the
// makefont utility. It is not necessary to call this function for the
// core PDF fonts (courier, helvetica, times, zapfdingbats).
// go get github.com/jung-kurt/gofpdf/makefont
// http://godoc.org/github.com/jung-kurt/gofpdf#Fpdf.AddFont