[NTG-context] SVG fonts not working properly

Hans Hagen j.hagen at xs4all.nl
Fri Feb 5 23:02:52 CET 2021

On 2/5/2021 6:29 PM, Jairo A. del Rio wrote:
> The following examples doesn't work as expected:
> \definefontfeature[emojis][default,color:svg][script=latn,language=dflt]
> \definefont[gilbert][file:Gilbert-ColorBoldPreview5*emojis @ 13bp]
> \starttext
> {\gilbert abcdefghijklmnpqrstuvwxyz}
> \stoptext
> Letters are displayed correctly, but ascenders and descenders don't. It 
> looks like characters are inserted like images rather than actual 
> characters. Am I missing something? Thank you in advance.
svg fonts are a bit of a mess adn there are not many (scaling, offset 
etc. and specs kind of fuzzy .. one needs for instance treat the visible 
area in a special way .. there is no metadata wrt the glyph involved so 
we need to experiment a bit (i don't want to end up with heuristics 
based on guesswork)

anyway, them being svg they are actually images (there was time that 
acrobat has svg on board but that was dropped) so what we end up is with 
is a pdf stream but in such a way that they are actual characters

you can try this:

\definefontfeature[color:svg]    [ccmp=yes,dist=yes,svg=fixdepth]

and patch lpdf-emb with

                              -- local y     = - b[4] - b[2] - (d.depth 
or 0)
                                 local y     = - (d.depth or 0)

and try some more (like emoji) ... no time now ... so you do the 
checking and later i will look at the result


                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl

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