[HarfBuzz] U+1A55 TAI THAM MEDIAL RA Reordering in HarfBuzz?

[Behdad Esfahbod]

Just give me a sequence and a font, with current hb-shape output and expected
output!  I really am no expert in those scripts...

On 13-04-23 05:18 PM, Ed Trager wrote:
> Hi, Behdad and List Members,
> 
> In Firefox 20.0 on Mac OS X and in Firefox 18.0.2 on Ubuntu, I see that the
> five PREFIXED TAI THAM DEPENDENT VOWEL SIGNS  U+1A6E, 1A6F, 1A70, 1A71, 1A72
> are correctly reordered and the spacing/kerning after reordering is also correct.
> 
> HOWEVER, U+1A55 TAI THAM MEDIAL RA is *NOT* being reordered in these two
> versions of Firefox ...  May I kindly ask WHY IS THAT ?
> 
> Surely FF 18.0.2 on Ubuntu is using HarfBuzz, yes?  I'm not sure about FF 20.0
> on Mac OS X -- also using HarfBuzz or not ?
> 
> On a related note, I see that Google Chrome Version 26.0.1410.65 on Mac OS X
> attempts to reorder both the PREFIXED DEP VOWEL SIGNS and MEDIAL RA but the
> spacing is all wrong and all of the reordered glyphs are just left-aligned to
> the base consonant instead of actually prefixed.  I'm not sure which layout
> engine is Chrome using on OS X?
> 
> Best - Ed
> 
> <IMAGE SHOWING RESULTS IS ATTACHED>
> 
> 
> 
> 
> 
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-- 
behdad
http://behdad.org/