Re: math as image in Info INFO_MATH_IMAGES

[Patrice Dumas]

On Tue, Dec 24, 2024 at 05:21:36PM +0000, Gavin Smith wrote:
> On Tue, Dec 24, 2024 at 02:36:22PM +0100, Patrice Dumas wrote:
> > Hello,
> > 
> > In the last commits, I have implemented math as images in Info as
> > discussed here:
> > https://lists.gnu.org/archive/html/help-texinfo/2024-08/msg00001.html
> > 
> > The customization variable is called: INFO_MATH_IMAGES (but it may
> > change if you have proposals).
> > 
> > The result is ok, but not too good.  Indeed, for @math, the images tend
> > to be bigger than the flow of text, their size is not scaled correctly.
> > @displaymath is even worse, even though I can open the image produced
> > with emacs and the image is fine, it does not show up if I open the
> > Info file in emacs.
> 
> Surely this is an issue with the Info viewer as the Info file itself
> does not have a size for text?

I do not think so, I think that it is an issue with the way the images
are generated, they should be generated for an approximate size of
displayed text or something like that, but I may be wrong.

> I tried this myself in emacs (I installed emacs specially for this).
> You can open an Info file with "C-u C-h i FILENAME".
> 
> The images is generated correctly for displaymath, just most of it is
> off the edge of the screen as the images are far too big for the
> text.  See screen shot.  The horizontal lines come from the image.

Ok, thanks, my screen was not big enough to see the --, so it should be
the same issue as for @math.

> We could ask Emacs users or developers if there is a way to make
> the images be displayed smaller in Info mode.

I have seen screenshots of AUCTeX (I believe) where the size of one line
from TeX was very similar to the size of one line in Emacs, my wild
guess is that it was not by chance.  It probably isn't possible to do
exactly the same if the size of the font in emacs display is needed to
be known, but at least having the images corresponding to the typical
size of fonts on screen would be nice.

-- 
Pat