Re: Thai issue for 2.0 timeframe

Jean-Marc Desperrier wrote:
> This is not that guaranteed to change in Cairo/FF 3. It depends on what
> ROC implements and he said in the comment of his blog :
> http://weblogs.mozillazine.org/roc/archives/2006/02/post_1.html
> 
> "It might make sense to eventually get line-breaking information from
> UPA. However, ultimate control has to stay with nsTextFrame so we can do
> hyphenation, CSS 'whitespace', and other effects. Given that, the
> simplest thing to do for now, while we get everything else working, is
> to keep on getting line-break information the way we currently do."
> 
> I think it's worth insisting that FF 3 needs UPA level line-breaking.

I'm sure we'll be happy to accept a patch...

In the new world we construct UPA (Uniscribe/Pango/ATSUI) textrun
objects only for spans of consistently styled text. For Thai line
breaking I assume we need to analyze text runs containing text with
different styles, which would be a big performance hit if we don't need
it. So I think that even if we get linebreak information from UPA, we'll
get it via a different interface than the gfxTextRun interface we're
using to render with UPA.

Rob