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/* -*- Mode: C; tab-width: 2 -*- */ |
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/*****************************************************************************/ |
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/** Copyright 1991 by Andreas Stolcke **/ |
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/** Copyright 1990 by Solbourne Computer Inc. **/ |
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/** Longmont, Colorado **/ |
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/** **/ |
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/** All Rights Reserved **/ |
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/** **/ |
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/** Permission to use, copy, modify, and distribute this software and **/ |
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/** its documentation for any purpose and without fee is hereby **/ |
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/** granted, provided that the above copyright notice appear in all **/ |
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/** copies and that both that copyright notice and this permis- **/ |
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/** sion notice appear in supporting documentation, and that the **/ |
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/** name of Solbourne not be used in advertising **/ |
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/** in publicity pertaining to distribution of the software without **/ |
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/** specific, written prior permission. **/ |
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/** **/ |
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/** ANDREAS STOLCKE AND SOLBOURNE COMPUTER INC. DISCLAIMS ALL WARRANTIES **/ |
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/** WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF **/ |
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/** MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL ANDREAS STOLCKE **/ |
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/** OR SOLBOURNE BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL **/ |
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/** DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA **/ |
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/** OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER **/ |
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/** TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE **/ |
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/** OR PERFORMANCE OF THIS SOFTWARE. **/ |
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/*****************************************************************************/ |
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/* |
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* vroot.h -- Virtual Root Window handling header file |
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* |
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* This header file redefines the X11 macros RootWindow and DefaultRootWindow, |
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* making them look for a virtual root window as provided by certain `virtual' |
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* window managers like swm and tvtwm. If none is found, the ordinary root |
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* window is returned, thus retaining backward compatibility with standard |
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* window managers. |
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* The function implementing the virtual root lookup remembers the result of |
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* its last invocation to avoid overhead in the case of repeated calls |
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* on the same display and screen arguments. |
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* The lookup code itself is taken from Tom LaStrange's ssetroot program. |
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* |
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* Most simple root window changing X programs can be converted to using |
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* virtual roots by just including |
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* |
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* #include <X11/vroot.h> |
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* |
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* after all the X11 header files. It has been tested on such popular |
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* X clients as xphoon, xfroot, xloadimage, and xaqua. |
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* It also works with the core clients xprop, xwininfo, xwd, and editres |
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* (and is necessary to get those clients working under tvtwm). |
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* It does NOT work with xsetroot; get the xsetroot replacement included in |
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* the tvtwm distribution instead. |
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* |
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* Andreas Stolcke <stolcke@ICSI.Berkeley.EDU>, 9/7/90 |
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* - replaced all NULL's with properly cast 0's, 5/6/91 |
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* - free children list (suggested by Mark Martin <mmm@cetia.fr>), 5/16/91 |
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* - include X11/Xlib.h and support RootWindowOfScreen, too 9/17/91 |
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* |
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* Jamie Zawinski <jwz@jwz.org>, 28-Apr-1997 |
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* - use ANSI C |
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* |
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* Jamie Zawinski <jwz@jwz.org>, 3-Sep-2003 |
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* - if the environment variable "XSCREENSAVER_WINDOW" is set, use that |
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* as the root window instead of searching for __SWM_VROOT. |
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*/ |
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|
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#ifndef _VROOT_H_ |
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#define _VROOT_H_ |
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#define _XSCREENSAVER_VROOT_H_ |
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|
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#if !defined(lint) && !defined(SABER) |
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static const char vroot_rcsid[] = |
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"#Id: vroot.h,v 1.5 2003/09/04 01:04:38 jwz Exp #" "\n" |
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"#Id: vroot.h,v 1.4 1991/09/30 19:23:16 stolcke Exp stolcke #"; |
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#endif |
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|
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#include <stdlib.h> |
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#include <X11/X.h> |
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#include <X11/Xatom.h> |
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#include <X11/Xlib.h> |
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|
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static Window |
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#ifdef __STDC__ /* ANSIfication added by jwz, to avoid superfluous warnings. */ |
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VirtualRootWindowOfScreen(Screen *screen) |
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#else /* !__STDC__ */ |
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VirtualRootWindowOfScreen(screen) Screen *screen; |
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#endif /* !__STDC__ */ |
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{ |
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static Screen *save_screen = (Screen *)0; |
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static Window root = (Window)0; |
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|
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if (screen != save_screen) { |
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Display *dpy = DisplayOfScreen(screen); |
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Atom __SWM_VROOT = None; |
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int i; |
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Window rootReturn, parentReturn, *children; |
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unsigned int numChildren; |
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|
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/* first check for a hex or decimal window ID in the environment */ |
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const char *xss_id = getenv("XSCREENSAVER_WINDOW"); |
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if (xss_id && *xss_id) { |
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unsigned long id = 0; |
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char c; |
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if (1 == sscanf (xss_id, " 0x%lx %c", &id, &c) || |
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1 == sscanf (xss_id, " %lu %c", &id, &c)) { |
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root = (Window) id; |
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save_screen = screen; |
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return root; |
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} |
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} |
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|
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root = RootWindowOfScreen(screen); |
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|
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/* go look for a virtual root */ |
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__SWM_VROOT = XInternAtom(dpy, "__SWM_VROOT", False); |
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if (XQueryTree(dpy, root, &rootReturn, &parentReturn, |
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&children, &numChildren)) { |
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for (i = 0; i < numChildren; i++) { |
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Atom actual_type; |
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int actual_format; |
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unsigned long nitems, bytesafter; |
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Window *newRoot = (Window *)0; |
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|
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if (XGetWindowProperty(dpy, children[i], |
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__SWM_VROOT, 0, 1, False, XA_WINDOW, |
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&actual_type, &actual_format, |
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&nitems, &bytesafter, |
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(unsigned char **) &newRoot) == Success |
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&& newRoot) { |
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root = *newRoot; |
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break; |
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} |
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} |
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if (children) |
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XFree((char *)children); |
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} |
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|
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save_screen = screen; |
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} |
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|
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return root; |
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} |
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|
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#undef RootWindowOfScreen |
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#define RootWindowOfScreen(s) VirtualRootWindowOfScreen(s) |
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|
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#undef RootWindow |
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#define RootWindow(dpy,screen) VirtualRootWindowOfScreen(ScreenOfDisplay(dpy,screen)) |
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|
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#undef DefaultRootWindow |
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#define DefaultRootWindow(dpy) VirtualRootWindowOfScreen(DefaultScreenOfDisplay(dpy)) |
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|
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#endif /* _VROOT_H_ */ |
