[Qt-interest] Text Handling speed on Mac (ATSUI, Core Text, Harfbuzz?)

[Josh]

Thanks for this info, very helpful. Interesting about Core Text being more 
capable than Harfbuzz. When I opened my program I immediately saw some 
(minor) OpenType issues that were not present in Linux/Windows. But I'm 
working with Hebrew, so it might just be in that area. Anyway, I could 
always try to get Qt/X11 working on Mac, I know others have done so, and 
that would give me Harfbuzz, but if anyone has ideas about how to get 
Harfbuzz working on Qt/Mac, let me know. Thanks!

Josh

>> 1) Can someone confirm that Qt is still using ATSUI for Mac?
>>
>> 2) Is there any plans to move to Core Text or even Harfbuzz on Mac?
>
> Qt will use Core Text when built against Cocoa. This is the default for
> 64-bit builds, but I believe 32-bit builds will still use Carbon/ATSUI
> etc by default. We're using the Cocoa build on both 32 and 64-bit and
> it's working well.
>
>> 3) Is there any reason I couldn't make a couple minor changes to the
> Qt
>> code and use Harfbuzz on Mac (I don't need any system fonts, I supply
> all
>> my own which are all TrueType/OpenType).
>
> I've not investigated this, though the idea is interesting. In my
> experience so far, the Core Text engine is rather more capable than the
> Harfbuzz implementation on Windows. For example the latter doesn't
> correctly kern OpenType fonts using the GPOS table (see QTBUG-11389).
>
> James
>
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