func glyphDiffs(cp1, cp2 codepage.CodepageIndex, first, last int) (diffs array) {
map1, map2 := cp1.Map(), cp2.Map()
same := true
for i := first; i <= last; i++ {
if same {
if map1[i] != map2[i] {
same = false
r := afm.RuneGlyphs[map2[i]]
if r == "" {
r = "question"
}
diffs = append(diffs, integer(i), name(r))
}
} else {
if map1[i] == map2[i] {
same = true
} else {
r := afm.RuneGlyphs[map2[i]]
if r == "" {
r = "question"
}
diffs = append(diffs, name(r))
}
}
}
return
}
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
}