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Re: A question about program icons ...
- From: Jon TURNEY <jon dot turney at dronecode dot org dot uk>
- To: cygwin-xfree at cygwin dot com, moss at cs dot umass dot edu
- Date: Mon, 01 Aug 2011 16:11:54 +0100
- Subject: Re: A question about program icons ...
- References: <4E318481.4010501@cs.umass.edu> <CAEhDDbCuy2FYkGmfXT4reKJ=s+XP9LhmMLbg3hsmHv64dUefwg@mail.gmail.com>
- Reply-to: cygwin-xfree <cygwin-xfree at cygwin dot com>
- Reply-to: cygwin-xfree at cygwin dot com
On 29/07/2011 15:10, Csaba Raduly wrote:
On Thu, Jul 28, 2011 at 5:47 PM, Eliot Moss wrote:
Recently I started using startxwin and .XWinrc and am
getting used to -multiwindow mode. Something I have been
wondering is where the program icons actually come from.
For example, I cannot for the life of me find the icons
used for xemacs (has a little red XE in it)
That seems to be /usr/share/xemacs-21.4.22/etc/xemacs-icon.xpm and
xemacs appears to set it programatically.
The window icons (shown on taskbar, top-left of window, etc.) are indeed set
programmatically.
This is the case for normal windows applications as well. There is no
requirement that the icon associated with a shortcut and the window icon which
is actually used by an application started by that shortcut be the same.
The multiwindow mode integrated WM understands about _NET_WM_ICON [1] and
WM_HINTS [2] X window properties and hopefully converts a suitable icon found
there on the fly into a Windows icon.
It's up to the X application itself how those properties get set.
[1] http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#id2507733
[2] http://tronche.com/gui/x/icccm/sec-4.html#WM_HINTS
When started from mintty, the xemach window has the generic Cywgin-X
icon, then switches to the red XE icon after it gets initialized.
xemacs is just a shortcut:
$ ls -l /bin/xemacs
lrwxrwxrwx 1 ecsardu root 18 Jul 29 15:41 /bin/xemacs -> xemacs-21.4.22.exe*
When started from a windows shortcut pointing to xemacs-21.4.22.exe,
it shows up with the icon of xemacs-21.4.22.exe and does not change
(because there is no DISPLAY in my Windows environment).
--
Jon TURNEY
Volunteer Cygwin/X X Server maintainer
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