GNU bug report logs - #20432
GDK_SCALE=2 GDK_DPI_SCALE=0.5 destroys GTK+ 3 scroll bar

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: "Felix E. Klee" <felix.klee <at> inka.de>
Subject: bug#20432: closed (Re: bug#20432: GDK_SCALE=2 GDK_DPI_SCALE=0.5
 destroys GTK+ 3 scroll bar)
Date: Thu, 14 May 2015 11:35:04 +0000

[Message part 1 (text/plain, inline)]

Your bug report

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

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 20432 <at> debbugs.gnu.org.

-- 
20432: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20432
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Jan Djärv <jan.h.d <at> swipnet.se>
To: "Felix E. Klee" <felix.klee <at> inka.de>, 20432-done <at> debbugs.gnu.org
Subject: Re: bug#20432: GDK_SCALE=2 GDK_DPI_SCALE=0.5 destroys GTK+ 3 scroll
 bar
Date: Thu, 14 May 2015 13:34:18 +0200

Hi.

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:
>
>      GDK_SCALE=2
>      GDK_DPI_SCALE=0.5
>
> 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
>   LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'
>
> 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...
> Quit
> Making completion list...
> Quit
> scroll-up-command: End of buffer
>
> Load-path shadows:
> None found.
>
> Features:
> (shadow sort gnus-util mail-extr emacsbug message idna format-spec
> rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
> mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
> mm-util help-fns mail-prsvr mail-utils help-mode easymenu time-date
> tooltip electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
> x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list
> newcomment lisp-mode prog-mode register page menu-bar rfn-eshadow timer
> select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
> frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
> tai-viet lao korean japanese hebrew greek romanian slovak czech european
> ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
> simple abbrev minibuffer nadvice loaddefs button faces cus-face macroexp
> files text-properties overlay sha1 md5 base64 format env code-pages mule
> custom widget hashtable-print-readable backquote make-network-process
> dbusbind gfilenotify dynamic-setting system-font-setting
> font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)
>
> 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))
>
>

[Message part 3 (message/rfc822, inline)]

From: "Felix E. Klee" <felix.klee <at> inka.de>
To: bug-gnu-emacs <at> gnu.org
Subject: GDK_SCALE=2 GDK_DPI_SCALE=0.5 destroys GTK+ 3 scroll bar
Date: Sun, 26 Apr 2015 11:01:09 +0100

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:

    GDK_SCALE=2
    GDK_DPI_SCALE=0.5

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



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
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'

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...
Quit
Making completion list...
Quit
scroll-up-command: End of buffer

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message idna format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns mail-prsvr mail-utils help-mode easymenu time-date
tooltip electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list
newcomment lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer nadvice loaddefs button faces cus-face macroexp
files text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

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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