Hey,
Every few months I've got asked questions by colleagues as to what
construes a pass for various bidi tests with a pass condition such as,
"Test passes if characters are in the same order".
These questions normally resolve around whether two glyphs are
realizations of the same grapheme (i.e., they are allographs). This has
been especially problematic in cases where we've failed to render
ligatures correctly, and hence the deviation from the reference image is
even greater.
Attached are a couple of examples of the sort of result that causes
issues (direction-unicode-bidi-017 and direction-unicode-bidi-026
respectively). I believe both screenshots represent a pass, though
Arabic is not a language I'm immensely familiar with. :)
I wonder how many of the bidi tests could be rewritten to be reftests,
and have a (very) small set of manually inspected pages (I wonder if
there's any way to get a better reference text in cases where a reftest
isn't possible?)… Any ideas? (I starred at the bidi algorithm for a bit,
then realized I'd need to spend far more time than it's really worth now
to get that all in my head again.)
--
Geoffrey Sneddon — Opera Software
<http://gsnedders.com>
<http://opera.com>
