Le Sun, Jan 30, 2022 at 08:44:05AM -0500, ibrahim via 9fans a écrit :
> On Sunday, 30 January 2022, at 8:55 AM, tlaronde wrote:
> > The lacking piece is the end: converting DVI to something else than PS
> and extending DVI to include drawing primitives so that there is a
> "MetaPost" generating DVI (Metadraw). The other points are already
> addressed.
>
> Perhaps xdvi is a good start point to understand how to convert dvi to raw
> images. dvi isn't a ready to display format you have to prepare the missing
> glyphs (fonts). Knuth has provided a converter to make dvi files human
> readable and you task is to interpret this output. If you take a viewer as a
> start point you could store the fineshed rendering in a file instead of
> saving that. Like ps dvi is also a virtual machine code but much simpler.
There is nothing difficult in the task per se. But when adding a
new block of DVI commands, it has to be done with some care. METAFONT
is also a rasterizer, so the fundamental bits are already there to
obtain a rasterized image. But there are, too, converters to develop
to translate the glyphes shapes of alien fonts in something
METAFONT can understand---TeX only uses the metrics informations,
it doesn't care about what is drawn in the boxes, this is why one
can use easily PS fonts with TeX; rendering, when what has to be
drawn is involved, is another story...
And xdvi is the perfect example of the problem: it has a myriad of
dependencies.
--
Thierry Laronde <tlaronde +AT+ polynum +dot+ com>
http://www.kergis.com/
http://kertex.kergis.com/
http://www.sbfa.fr/
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