On 01/11/2023 12:36, Hans Hagen via ntg-context wrote:
On 10/31/2023 8:18 PM, Vincent Hennebert wrote:
Hello there,
I had mentioned this on a thread some (long) time ago, finally got
around to finishing a first version of a typescript with the Adobe
Source font family, in all its weight alternatives and design sizes
(the latter being available in the Serif style only).
Comments welcome. If it looks good I can upload it to the wiki, on the
Typescripts_examples page I guess.
I have no tiem now to figure out this (somewhat excessive) amount of
fonts - hopefully we will not end up in a world where all fonts have
many weights which makes it easier for designers not to make choices and
delegate that to users instead. That said,
- attached a different approach
Interesting. I’ll try and extend it to include the sans and mono styles.
I’m not sure which version will be more readable in the end. My Lua
function to determine the font file name is a bit convoluted indeed.
- in your variant you can put the lua in the lfg file (at the top) and
then add \loadfontgoodies[...] before where the functions are used
Ok. But then that means that the designsizes table will be used all the
time, including when design sizes are disabled, right? Which would mean
that I _must_ define the regular size as a fallback.
I'm not sure if we can talk of design sizes here. It's more about
'usage' because a display vs subhead vs ... variant is not about mixing
depending on scale (e.g. using display for 20 pt in a 15 pt setup versus
using scaled regular for 20pt and then display 20pt for e.g. a title
page or 50pt on posters).
I think I see your point. I think we can still talk about design sizes
but, instead of thinking in absolute sizes, we would want to think in
sizes relative to the font setup.
That is, instead of saying ‘Caption shall be used for sizes 6.5pt and
below, SmText for 9.5pt and below etc.’, we would want to say ‘Caption
shall be used for 50% of the body font size and below, SmText for 75%
and below, etc.’
This way, design sizes would be used ‘harmoniously’ no matter the
scaling. A poster, for instance, would usually be viewed at such a
distance that the apparent size of small text (typeset at, say, 25pt
when the main text is at 50pt, therefore using Caption) would match the
apparent size of caption text in a regular document typeset at 12pt and
read from a normal distance.
Make sense?
As a corollary: Does the design sizes mechanism used in goodies file
allow to use relative sizes?
(I have Questions For the Experts further down...)
maybe a side effect of not defining a math font
About Adobe Source
==================
The fonts are available on GitHub [1]. They are the descendants of the
Source {Serif,Sans,Code} Pro fonts described in the
type-imp-source.mkiv typescript available in the ConTeXt distribution.
Due to major changes, Serif Pro was renamed into Serif 4 in, well, its
version 4 [2] (that’s the version that introduces design sizes, a.k.a.
optical sizes), and Sans Pro was renamed into Sans 3 [3].
[1] https://github.com/adobe-fonts/
[2] https://github.com/adobe-fonts/source-serif/releases/tag/4.004R
[3] https://github.com/adobe-fonts/source-sans/issues/192
Usage
=====
Short version: store the attached typescript and its helper Lua files
somewhere on your file system where ConTeXt will find them
($HOME/texmf for example), then use in your document:
\setupbodyfont[adobesource]
Long version: The default typescript name is adobesource (also
available as adobesource-regular) and has design sizes enabled.
Each weight is also available: adobesource-extralight,
adobesource-light, etc., all the way to adobesource-black. There is
also a medium weight, that selects the regular versions of Serif and
Sans, but the medium version of Mono (just slightly bolder than the
regular one, presumably for better on-screen rendering in terminals).
Design sizes can be disabled by adding -nodesignsize- to the
typescript name: adobesource-nodesignsize-extralight, etc.
Finally, I thought it would be cool to over-engineer the typescript a
little bit and provide direct access to the design sizes (in case one
would want a narrower version for body text, or a bolder and more
expanded version for titles, etc.). Here they are, again in all their
weights: adobesource-caption-extralight, adobesource-smtext-light,
adobesource-subhead, adobesource-display-bold, etc. The ‘regular’
design size is accessed by simply using adobesource-nodesignsize.
Questions For the Experts
=========================
To avoid a gigantic typescript file with a lot of duplication, I
offloaded the font filename calculation to a Lua function (see
attached adobesource.lua). I initially wanted to put the Lua code
inside the typescript, but then I had all sorts of weird Lua
compilation errors. The very same code works fine when included in a
normal document though. Could it be that typescripts are processed in
some special mode that doesn’t like Lua syntax? As a workaround, I put
the code in an external file and require it from inside the typescript.
In the goodies file, I use what I believe is the largest possible font
size that can be used in ConTeXt (16,383pt) to select the Display
design size. Otherwise, text above that size will fall back to the
default, regular design size.
Now, since I use the goodies file only when design sizes are enabled,
I thought I could make it more robust by using AdobeSource4Display as
a default, that is, for any size above 16.5pt. However, if I mix
design sizes enabled and disabled in a document, the disabled one
seems to be using the goodies file even though it’s not mentioned in
the typescript. Any idea of why? For example:
\usetypescriptfile[adobesource]
\usebodyfont[adobesource]
\setupbodyfont[adobesource-nodesignsize]
\starttext
This text is typeset in Display when Regular should be used.
\switchtobodyfont[adobesource]
This text is typeset in Regular with design sizes enabled.
\stoptext
What’s Next
===========
* A harmonious-looking companion math font.
* A harmonious-looking companion math font that uses glyphs from Adobe
Serif 4 when available.
Thanks,
Vincent
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl /
https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
archive : https://github.com/contextgarden/context
wiki : https://wiki.contextgarden.net
___________________________________________________________________________________
