[HarfBuzz] What is the utility of the advances list?

[eduardo]

Is there any reason other than the kerning? Bacause it can be extracted 
quite easily using the FT_Get_Kerning function.

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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