On 22-10-2012 21:41, Otared Kavian wrote:
On 22 oct. 2012, at 18:47, Marco Pessotto <melmo...@gmail.com> wrote:
[…]
Should the attached (compiled with the latest beta, as fixed by Hans) be
used as referenced?
Hi Marco and Hans,
Thanks to everyone for your attention, and many thanks to Hans for having tried
to fix the bug in mkiv.
Unfortunately the bug is still there, as it can be seen from the comparison of
the two PDF files I am sending with this message: they are both the result of
typesetting the same source file I sent you. The one typeset with mkii has the
correct output, while the one with mkiv is not correct (the spacing of the
bounds of the integrals and the spacing between the integrals when they are
invoked with \iint or \iiint are incorrect). (I tried this with ConTeXt version
2012-10-22, 11:01).
The « reference » output should be the file « math-integral-mkii-2012-10-22.pdf
»
Keep in mind that mkiv and mkii will never produce the same results
(e.g.: more granularity in font metrics in mkiv, less juggling with
combined shapes in mkiv, etc). SO, it can never be the pixel wise reference.
The issue with italic correction is complex. First of all italic
corrections are a tex thing while in otf advanced kerning mechanism is
used. This means that the engine has to deal with traditional as well ad
new mechanisms. In the process of developing luatex and mkiv, we went
through several phases, one is that the italic correction had to be
added to the width (a handicap is that luatex has to make some guesses,
and the mkiv vf is a wide font on the one hand but still a traditional
one).
Anyhow, already quite a while ago, mkiv got two mechanisms to deal with
italic correction, one for text and one for math (otf text fonts have no
italic correction). Both mechanism can be configured to adapt themselves
to the situation. For math we have 4 variants.
\setupmathematics[italics=1] % fontitalics
\setupmathematics[italics=2] % fontdata
\setupmathematics[italics=3] % quad based
\setupmathematics[italics=4] % combination of 1 and 3
\setupmathematics[italics=none]
Depending on available italic info or the lack of it, correction is
applied. Of course this can be improved.
Once they are complete, we can make the new gyre math fonts default and
some of the problems will go away. The virtuals will then be kept as an
example of defining virtual fonts.
Concerning the issue: i removed adding the italic correction to the
width (something that was needed in a previous version of luatex).
Hans
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
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