示例#1
0
func (dw *DocWriter) widthsForFontCodepage(f *font.Font, cpi codepage.CodepageIndex) *indirectObject {
	var widths [256]int
	upm := f.UnitsPerEm()
	// Avoid divide by zero error for unusual fonts.
	if upm > 0 {
		for i, r := range cpi.Map() {
			designWidth, _ := f.AdvanceWidth(r)
			widths[i] = designWidth * 1000 / upm
		}
	}
	pdfWidths := arrayFromInts(widths[32:])
	ioWidths := &indirectObject{dw.nextSeq(), 0, &pdfWidths}
	return ioWidths
}
示例#2
0
func (dw *DocWriter) fontKey(f *font.Font, cpi codepage.CodepageIndex) string {
	if f == nil {
		panic("fontKey: No font specified.")
	}
	if !f.HasMetrics() {
		panic("fontKey: font missing metrics.")
	}
	name := fmt.Sprintf("%s/%s-%s", f.PostScriptName(), cpi, f.SubType())
	if key, ok := dw.fontKeys[name]; ok {
		return key
	}
	descriptor := newFontDescriptor(
		dw.nextSeq(), 0,
		f.PostScriptName(), f.Family(),
		f.Flags(),
		f.BoundingBox(),
		0, // missingWidth
		f.StemV(),
		0, // stemH
		f.ItalicAngle(),
		f.CapHeight(),
		f.XHeight(),
		f.Ascent(),
		f.Descent(),
		f.Leading(),
		0, 0) // maxWidth, avgWidth
	dw.file.body.add(descriptor)
	key := fmt.Sprintf("F%d", len(dw.fontKeys))
	dw.fontKeys[name] = key
	widths := dw.widthsForFontCodepage(f, cpi)
	dw.file.body.add(widths)
	var font *simpleFont
	switch f.SubType() {
	case "Type1":
		if useStandardEncoding(f.Family()) {
			font = newType1Font(
				dw.nextSeq(), 0,
				f.PostScriptName(),
				32, 255, widths,
				descriptor, nil)
		} else {
			encoding, ok := dw.fontEncodings[cpi.String()]
			if !ok {
				differences := glyphDiffs(codepage.Idx_CP1252, cpi, 32, 255)
				encoding = newFontEncoding(dw.nextSeq(), 0, "WinAnsiEncoding", differences)
				dw.file.body.add(encoding)
				dw.fontEncodings[cpi.String()] = encoding
			}
			font = newType1Font(
				dw.nextSeq(), 0,
				f.PostScriptName(),
				32, 255, widths,
				descriptor, &indirectObjectRef{encoding})
		}
	case "TrueType":
		font = newTrueTypeFont(
			dw.nextSeq(), 0,
			f.PostScriptName(),
			32, 255, widths,
			descriptor)
	}
	dw.file.body.add(font)
	dw.resources.fonts[key] = &indirectObjectRef{font}
	return key
}