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

From: Jason Rumney
Subject: Re: display-mm-width return value off on Windows
Date: Mon, 10 Jul 2006 14:29:29 +0100
User-agent: Thunderbird (Windows/20060516)

David Kastrup wrote:
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
At least on Windows, point sizes for fonts are based on user configuration, not the actual physical size of the monitor. So I don't think you should be using display-mm-* for calculating sizes you expect to be relative to fonts anyway. Why not use the pixel size of the font? Surely that will be more accurate for the purpose you want.

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