From: storm@cua.dk (Kim F. Storm)
Cc: Ralf Angeli <angeli@caeruleus.net>,
lennart.borgman.073@student.lu.se, jasonr@gnu.org,
emacs-devel@gnu.org
Subject: Re: display-mm-width return value off on Windows
Date: Mon, 10 Jul 2006 12:30:24 +0200 [thread overview]
Message-ID: <m31wstkb0f.fsf@kfs-l.imdomain.dk> (raw)
In-Reply-To: <uodvyoc91.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 09 Jul 2006 21:37:46 +0300")
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Ralf Angeli <angeli@caeruleus.net>
>> Cc: Lennart Borgman <lennart.borgman.073@student.lu.se>, Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
>> Date: Sun, 09 Jul 2006 09:41:53 +0200
>>
>> If `GetDeviceCaps (hdc, HORSIZE)' always assumes a fixed DPI value
>> that would explain why the values are so inaccurate especially on
>> displays with a high DPI value. In that case I think it makes sense
>> to use the DPI value when calculating the size (as my patch does) and
>> assume that the user set it to a value matching her monitor.
>>
>> As a last resort we could provide user options (in Emacs) for setting
>> the correct size of the screen which will be used as return values for
>> `display-mm-{width,height}'.
>
> Sounds like a good plan to me.
I have had problems on X too (where the drivers provide wrong DPI
values), so the following piece of code in xdisp.c fails to DTRT:
#ifdef HAVE_WINDOW_SYSTEM
if (FRAME_WINDOW_P (it->f)
&& (ppi = (width_p
? FRAME_X_DISPLAY_INFO (it->f)->resx
: FRAME_X_DISPLAY_INFO (it->f)->resy),
ppi > 0))
return OK_PIXELS (ppi / pixels);
#endif
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.
--
Kim F. Storm <storm@cua.dk> http://www.cua.dk
next prev parent reply other threads:[~2006-07-10 10:30 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-06 17:50 display-mm-width return value off on Windows Ralf Angeli
2006-07-06 21:08 ` Eli Zaretskii
2006-07-06 21:25 ` David Kastrup
2006-07-07 5:56 ` Ralf Angeli
2006-07-07 10:18 ` Eli Zaretskii
2006-07-07 10:22 ` Eli Zaretskii
2006-07-07 12:05 ` Lennart Borgman
2006-07-07 16:54 ` Ralf Angeli
2006-07-08 12:58 ` Eli Zaretskii
2006-07-08 13:23 ` Lennart Borgman
2006-07-08 14:42 ` Eli Zaretskii
2006-07-08 21:27 ` Jason Rumney
2006-07-08 22:23 ` David Kastrup
2006-07-08 23:03 ` Jason Rumney
2006-07-09 7:36 ` Ralf Angeli
2006-07-09 8:03 ` David Kastrup
2006-07-09 7:41 ` Ralf Angeli
2006-07-09 8:05 ` David Kastrup
2006-07-09 18:37 ` Eli Zaretskii
2006-07-10 10:30 ` Kim F. Storm [this message]
2006-07-10 10:45 ` David Kastrup
2006-07-10 13:29 ` Jason Rumney
2006-07-10 14:19 ` David Kastrup
2006-07-10 21:28 ` Jason Rumney
2006-07-10 22:05 ` David Kastrup
2006-07-10 20:12 ` Eli Zaretskii
2006-07-10 23:17 ` Kim F. Storm
2006-07-10 23:22 ` David Kastrup
2006-07-11 18:43 ` Ralf Angeli
2006-07-12 13:07 ` Kim F. Storm
2006-07-12 19:22 ` Richard Stallman
2006-07-13 19:38 ` Ralf Angeli
2006-07-13 19:59 ` David Kastrup
2006-07-14 17:03 ` Richard Stallman
2006-07-14 18:16 ` Stefan Monnier
2006-07-14 18:33 ` David Kastrup
2006-07-14 21:37 ` Stefan Monnier
2006-07-15 22:06 ` Ralf Angeli
2006-07-16 17:04 ` Ralf Angeli
2006-07-14 17:03 ` Richard Stallman
2006-07-09 9:31 ` Jan Djärv
2006-07-08 17:40 ` Robert J. Chassell
2006-07-06 22:09 ` Jason Rumney
2006-07-06 22:37 ` Lennart Borgman
2006-07-07 5:50 ` Ralf Angeli
2006-07-07 9:09 ` Eli Zaretskii
2006-08-05 14:50 ` Ralf Angeli
2006-08-19 15:15 ` Ralf Angeli
2006-08-19 15:37 ` David Kastrup
2006-08-19 16:31 ` Jason Rumney
2006-08-19 17:54 ` Ralf Angeli
2006-08-19 22:34 ` Jason Rumney
2006-08-20 8:19 ` Ralf Angeli
2006-08-21 9:06 ` Eli Zaretskii
2006-08-21 9:17 ` Lennart Borgman
2006-08-21 10:22 ` Eli Zaretskii
2006-08-21 10:36 ` David Kastrup
2006-08-21 11:45 ` Jason Rumney
2006-08-21 11:55 ` David Kastrup
2006-08-21 10:43 ` Lennart Borgman
2006-08-21 14:07 ` Eli Zaretskii
2006-08-21 15:03 ` Lennart Borgman
2006-08-21 19:22 ` Ralf Angeli
2006-08-21 23:10 ` Eli Zaretskii
2006-08-22 5:57 ` Ralf Angeli
2006-08-22 19:16 ` Ralf Angeli
2006-08-22 21:38 ` Kim F. Storm
2006-08-23 18:31 ` Ralf Angeli
2006-08-23 22:44 ` Kim F. Storm
2006-08-24 16:14 ` Ralf Angeli
2006-08-24 20:18 ` Kim F. Storm
2006-08-25 16:38 ` Ralf Angeli
2006-08-25 22:28 ` Kim F. Storm
2006-08-21 23:25 ` Jason Rumney
2006-08-22 5:51 ` Ralf Angeli
2006-08-22 7:46 ` Jason Rumney
2006-08-22 19:24 ` Ralf Angeli
-- strict thread matches above, loose matches on Subject: below --
2006-07-14 23:55 Robert J. Chassell
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