On 29/10/13 10:49, eduardo wrote:
Is there any reason other than the kerning? Bacause it can be extracted
quite easily using the FT_Get_Kerning function.
Many reasons. GPOS positioning is far more flexible than just kern
pairs. E.g. there could be a simple kern for "To", but a different kern
value to be used when the "o" has a combining accent following it.
FT_Get_Kerning will only report simple kern pairs from the 'kern' table
(if present); I don't think it even looks at GPOS, and it certainly
can't return any meaningful data about more general positioning rules.
Maybe you should read up about the OpenType layout process...
http://www.microsoft.com/typography/SpecificationsOverview.mspx
On Tue, 29 Oct 2013 10:40:59 +0000, Jonathan Kew wrote:
On 29/10/13 10:19, eduardo wrote:
Hi,
Why does hb return a list of advances when, given a glyph, it can easily
be extracted from the font? Are the glyph advances context dependant? If
so, what is a good language/script to see the difference?
Yes, of course they're context-dependent. The simplest example may be
kerning. If the GPOS table contains a kern pair for "AV", then the
advances you get from harfbuzz for the 'A' and 'V' glyphs will not be
the same as the individual glyph advances you'd find in the font.
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