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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 13:34:18 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0


Den 2015-04-26 12:01, Felix E. Klee skrev:
I'm running Emacs on high DPI screen, and for scaling icons and other UI
elements in GTK+ applications, I've set in the environment:


This, however, confuses EMACS: The scrollbar gets squished.

This GTK feature is very poorly designed. We can not support it correctly, as we don't use Gtk+ exclusively. There is a race between Gtk+ and the window manager and Emacs that will result in different frame sizes on frame creation. Sometimes its the default size (80x34), sometimes its twice as big.

Also, the Gtk+ code blindly multiplies anything with GTK_SCALE. So for example, given GTK_SCALE=2, if we have font size 15, it becomes 30. But in order to compensate for this multiplication we need to divide with 2 before passing sizes to Gtk+. So 15 becomes 7 (integer division), which Gtk+ turns to 14. So there will be glitches, live with it.

But at least we draw things correctly in the trunk now.

        Jan D.

In GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.2)
  of 2015-04-20 on bitzer.hoetzel.info
Windowing system distributor `The X.Org Foundation', version 11.0.11701000
System Description: Arch Linux

Configured using:
  `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
  --localstatedir=/var --with-x-toolkit=gtk3 --with-xft
  'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
  --param=ssp-buffer-size=4' CPPFLAGS=-D_FORTIFY_SOURCE=2

Important settings:
   value of $LANG: en_US.UTF-8
   locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
   tooltip-mode: t
   electric-indent-mode: t
   mouse-wheel-mode: t
   tool-bar-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   blink-cursor-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   buffer-read-only: t
   line-number-mode: t
   transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...
Making completion list...
scroll-up-command: End of buffer

Load-path shadows:
None found.

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Memory information:
((conses 16 74597 8753)
  (symbols 48 17662 0)
  (miscs 40 64 138)
  (strings 32 9283 4419)
  (string-bytes 1 253558)
  (vectors 16 8988)
  (vector-slots 8 384078 17367)
  (floats 8 64 222)
  (intervals 56 183 16)
  (buffers 960 13)
  (heap 1024 24992 889))

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