On 11/6/2012 5:22 PM, Otared Kavian wrote:
Dear Dalyoung,
I can confirm that there is still a serious issue with the way mkiv handles the
bounds of integral signs, and this has been reported several times by Aditya,
myself and others.
In particular the latest beta (version 2012.11.06 09:56) handles the bounds
somwhat inconsistently, depending on the fonts used:
• with the default LM fonts, the bounds of the integral sign are
correct in displayed maths, but are too close whith inline maths;
• with the default xits fonts, the bounds of the integral sign are too
far away in displayed maths, but are a little bit far whith inline maths.
Here are the source file for my testing and the resulting PDF file. PLease
typeset the file both with mkii and mkiv to see the differences.
Hans did some changes recently, which resulted in a better behaviour of the
bug, but still the problem is not completely solved.
The problem with integrals is that we need to support new fonts as well
as old ones. One issue is that the width of an integral sign is not the
real with but has some interference with italic corrections. Also, older
versions of luatex has issues with this and for that context has some
mechanisms that could deal with it. The current version of luatex has
improved math so those hacks can go away. Also, math fonts have been
adapted to the latest interpretations of the open type math
specification (and those that don't ... well, lets forget about using
them). In due time all math fonts will be real otf fonts, but I like to
keep the virtual variant(s) around (as I've too much time invested in
it, they server as example of defining virtual fonts, and as benchmark
for traditional fonts).
At the same time we need to deal with italic corrections, in text, where
open type does not have such a property, as well as in math, where fonts
can have italic corrections but (as with more cases) the implementation
of them can be limited.
Anyhow, I now trust luatex do some of that better than before (let's
assume recent engines and fonts). However, some automagic italic
correction between italic shapes and non italic shapes as well as math /
text boundaries are still dealt with.
Yet another issue is that we have double and triple integrals so from
now on that's also done differently for the virtual fonts (read: more
mkiv like) as we had already the mechanisms for that in place.
So ... another attempt.
Hans
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