[XeTeX] misplaced accents in printout only?

[Zdenek Wagner]

Hi all,

years ago the problems with csfonts occured when the document was printed
from Adobe Reader 5 and it was consistent on all platforms and all
printers. It was not the case of other versions of Acrobat and Ghostscript.
It thus seems to me that some renderers are more tolerant to font bugs.

Zdeněk Wagner
http://ttsm.icpf.cas.cz/team/wagner.shtml
http://icebearsoft.euweb.cz

2016-01-19 13:39 GMT+01:00 Philip Taylor <P.Taylor at rhul.ac.uk>:

>
>
> Dominik Wujastyk wrote:
>
> > But when I /print/ his document on my HP LaserJet Pro 400 MFP
> > printer, the underdots have turned into overdots, and are shifted
> > slightly horizontally.  I attach a scan of the printed output,
> > kkk-pdf-scan.pdf.
>
> Unable to replicate that on a Dell 3310, HP CP1215, Epson R300 or Adobe
> PostScript driver, Dominik, but in all cases I printed from Adobe
> Acrobat Pro V7 rather than from one of your more esoteric PDF renderers.
> Are you in a position to be able to test using a genuine Adobe rendering
> engine ?
>
> This not to suggest for one second that I disagree with Zdeněk's
> putative hypothesis :
>
> > A naive idea is to draw the accent first, then move back to the
> > reference point and then draw "a". Doing this you have two move
> > operations in a sequence, one from the end of the accent outline to
> > the reference font, another from the reference point to the beginning
> > of the "a" outline. this is not allowed. Some rasterizes can cope
> > with it and the result looks as expected, some rasterizers do funny
> > things (they usually delete one of the moves. It might be your case,
> > so probably the font contains a sequence of two moves for the
> > dotbelow accent.
>
> but perhaps an Adobe rendering engine might handle things better.
>
> ** Phil.
>
>
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