Re: Problem with narrow vs condensed fonts

[Jason Rumney <jasonr@gnu.org>]

Kenichi Handa wrote:
> By the way, I think having different numeric values for
> Windows is not right.  The function font-spec accepts also
> numeric values for style parameters (:weight, :slant,
> :width).  So, it is better that the numeric values are
> consistent in all versions of Emacs.  Is it difficult (or
> time consuming) to map windows numeric values to what
> specified in font-XXX-table in w32_enumfont_pattern_entity?
>   

It is probably quite difficult and error prone, as we would be mapping a 
larger range (100-900 for weight on windows) onto a smaller range 
(0-210), and the mapping appears to be non-linear. Although in practice, 
most fonts probably use the fixed values currently defined in 
font-weight-table, I don't think it is guaranteed.

I don't think users will be surprised if numeric weights are defined as 
backend specific. Perhaps we shouldn't even allow them for the x 
backend, since they are not supported natively.