Re: [Freefont-bugs] [PATCH] Remove math constructions that do not have glyph extenders

[Steve White]

Hello Frédéric et al,

We did a lot of work on the MATH tables this weekend.  Thanks for your
great test page!

Several were added or corrected, and some new glyphs were added to
make further extensible characters.

There are already several vertical sizes for sum, integral, and slash.
The largest sizes of these are already at the bounds prescribed by the
font.  To go farther would cause serious line spacing issues -- we
can't do that.

A simple mechanism of constructing larger characters from two halves
would permit a summation twice as high, as well as neatly shaped angle
brackets twice as high.  However, on your advice we have removed the
table entries in the font that were meant to do this.

It escapes me why the existing font tables can't be used for that
purpose -- I presume it's just forbidden in some standards document,
but I don't think I've seen that document.

Could you provide a link to the standards document governing the use
of the OpenType MATH tables, which makes this clear?

Cheers!



On Sat, Apr 18, 2015 at 8:20 AM, Frédéric WANG <address@hidden> wrote:
> Hi Steve,
>
> Per the feedback by Jonathan & Khaled, math constructions without glyph
> extenders are invalid so the attached patch removes them. However, we
> probably want to add larger variants for slash, backslash, and
> left/right angle brackets...
>
> --
> Frédéric Wang
> maths-informatique-jeux.com/blog/frederic
>