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Re: display-mm-width return value off on Windows

From: David Kastrup
Subject: Re: display-mm-width return value off on Windows
Date: Mon, 10 Jul 2006 12:45:06 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

address@hidden (Kim F. Storm) writes:

> So I tried to do fix that (in a way similar to the one proposed for
> display-mm-*) some time ago, but didn't complete it, as it wasn't
> really clear what had to be done.
> First of all, it had to be done per-display (at least X supports
> multiple display),
> Secondly, it was not clear to me whether this problem was specific
> to X, but I guessed it was not, so changes had to be done for
> all platforms (as it involved added stuff to "display-info".)
> Last, but not least, it was unclear what other parts of the code
> would also need changes -- e.g. display-mm-* -- which would have
> to be reworked to not just use some X-macro like WidthMMOfScreen.

Whatever solution is chosen in the end: it is important that the same
algorithm is used for converting point size of fonts into pixel size
and vice versa.

preview-latex needs to guess how many pixels a given font will occupy
on the screen in order to create graphics matching in size.  And the
font sizes are returned in points, namely physical dimensions.

David Kastrup, Kriemhildstr. 15, 44793 Bochum

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