[cairo] Quartz bug with right-to-left and bidirectional text

Vladimir Vukicevic vladimir at pobox.com
Mon Oct 27 10:46:05 PDT 2008

Hey Ben,

Can you provide a testcase for this?  The quartz surface backend  
itself just deals with positioned glyphs; if you're using the cairo  
toy font backend, I don't think it provides any guarantees about  
support for RTL or bidi text.  Are you using pango?

     - Vlad

On Oct 27, 2008, at 5:49 AM, Ben Schmidt wrote:

> Hi,
> The Quartz backend, presumably because of bidirectional support in  
> Quartz which
> doesn't behave as Cairo expects, renders right-to-left and  
> bidirectional text
> differently to other Cairo backends. Since Cairo output should be  
> independent of
> the backend, this is of course a bug.
> I noticed it using a GTK+2 GUI version of Vim which I use for  
> reading and writing
> Hebrew text. When the Cairo Quartz support was enabled, the output  
> went wrong! I
> requested a +no_quartz variant to the MacPorts Cairo installation  
> and attached
> screen shots and a text file to demonstrate the bug here:
> https://trac.macports.org/ticket/16778
> It would be good if this could be added to your bug tracker and CC  
> me regarding
> changes/progress. Or if this is a known bug, if you could CC me on  
> that, it'd be
> great. I did a quick search of the bug database and couldn't spot it  
> there
> already, though. I don't intend to stay subscribed to this list for  
> more than a
> few days to field replies to this report.
> Thanks very much.
> Ben.
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