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bug#20432: GDK_SCALE=2 GDK_DPI_SCALE=0.5 destroys GTK+ 3 scroll bar

From: Jan Djärv
Subject: bug#20432: GDK_SCALE=2 GDK_DPI_SCALE=0.5 destroys GTK+ 3 scroll bar
Date: Thu, 14 May 2015 15:13:03 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

Den 2015-05-14 14:46, Felix E. Klee skrev:
On Thu, May 14, 2015 at 1:33 PM, Jan Djärv <address@hidden> wrote:
That is what `GDK_DPI_SCALE` is for. Example:

      export GDK_SCALE=2
      export GDK_DPI_SCALE=0.5

That does not help. For WM hints, Gtk+ uses GDK_SCALE.

OK. BTW on the system I’ve set up I position and resize windows with the
WM (FVWM), and there are no issues with `GDK_SCALE`. If I specify that a
window should be sized 2000 × 1000 px, then it’s set to that size.
`GDK_SCALE` only affects the contents of the window.

That is true, and part of why this is a half-baked solution.
xrandr --scale works fine for me, no need to fiddle with per application settings. Also, it works fine to plug in a non-hidpi monitor and move apps from one monitor to another. GDK_SCALE absolutely breaks that.

An alternative would be for Emacs to multply font sizes with

Why bother? Don’t fonts get rendered via the GTK+ API?

Gtk+ is only used for the tool bar, menus and scroll bar (more or less).
Gtk+ is not a requirement for Emacs.
Anyway, its a lot of work. A lot of Emacs internals needs to know the font size and the scaling needs to be applied in many places.

        Jan D.

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