[HarfBuzz] Ligatures and color changes

[Lóránt Pintér]

Hi,

I have a problem with half-colored ligatures, like "(5) mfim" in the image:

I figured out two ways to do this, but neither is good enough:
I can shape each color range separately, but then I lose the kerning between them, breaking (6)
I can tell HarfBuzz to disable ligatures for the last of the first character of each color range, but then it breaks (2) or (3) and (4).


Is there maybe a way to tell HarfBuzz to ignore ligatures if they span that color boundary? Or is there maybe a way to (quickly) assess if "liga" would be applied to a range of characters?

Thanks.

--  
Lóránt Pintér
Developer at Prezi (http://prezi.com)


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/harfbuzz/attachments/20130219/640e4e39/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 71298 bytes
Desc: not available
URL: <http://lists.freedesktop.org/archives/harfbuzz/attachments/20130219/640e4e39/attachment.png>