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

From: Ralf Angeli
Subject: Re: display-mm-width return value off on Windows
Date: Tue, 11 Jul 2006 20:43:11 +0200

* Eli Zaretskii (2006-07-09) writes:

>> From: Ralf Angeli <address@hidden>
>> 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.

Here are change log entries and patches to achieve that:

2006-07-11  Ralf Angeli  <address@hidden>

        * frame.el (display-mm-height): New variable.
        (display-mm-height): Use it.
        (display-mm-width): New variable.
        (display-mm-width): Use it.

Attachment: frame.el.patch
Description: Text Data

2006-07-11  Ralf Angeli  <address@hidden>

        * w32fns.c (Fx_display_mm_height, Fx_display_mm_width): Calculate
        size of display by means of size in pixels and number of pixels
        per inch.

Attachment: w32fns.c.patch
Description: Text Data


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