glyph.item
to
give the effect of typographic letter spacing.pangoGlyphItemLetterSpace(glyph.item, text, log.attrs)
glyph.item
text
glyph.item
corresponds to
(glyph_item->item->offset is an offset from the
start of text
)log.attrs
PangoLogAttr
] logical attributes for the item (the
first logical attribute refers to the position
before the first character in the item)