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120 lines
4.8 KiB
C
120 lines
4.8 KiB
C
/*****************************************************************************/
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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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#ifndef _VROOT_H_
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#define _VROOT_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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static Window
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VirtualRootWindowOfScreen(screen)
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Screen *screen;
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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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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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root = RootWindowOfScreen(screen);
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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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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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save_screen = screen;
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}
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return root;
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}
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#undef RootWindowOfScreen
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#define RootWindowOfScreen(s) VirtualRootWindowOfScreen(s)
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#undef RootWindow
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#define RootWindow(dpy,screen) VirtualRootWindowOfScreen(ScreenOfDisplay(dpy,screen))
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#undef DefaultRootWindow
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#define DefaultRootWindow(dpy) VirtualRootWindowOfScreen(DefaultScreenOfDisplay(dpy))
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#endif /* _VROOT_H_ */
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