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sync code with last improvements from OpenBSD

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purplerain 2023-08-28 05:57:34 +00:00
commit 88965415ff
Signed by: purplerain
GPG key ID: F42C07F07E2E35B7
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#ifndef _VROOT_H_
#define _VROOT_H_
#if !defined( lint ) && !defined( SABER )
/* #ident "@(#)vroot.h 4.14 99/06/17 xlockmore" */
#endif
/*****************************************************************************/
/** Copyright 1991 by Andreas Stolcke **/
/** Copyright 1990 by Solbourne Computer Inc. **/
/** Longmont, Colorado **/
/** **/
/** All Rights Reserved **/
/** **/
/** Permission to use, copy, modify, and distribute this software and **/
/** its documentation for any purpose and without fee is hereby **/
/** granted, provided that the above copyright notice appear in all **/
/** copies and that both that copyright notice and this permis- **/
/** sion notice appear in supporting documentation, and that the **/
/** name of Solbourne not be used in advertising **/
/** in publicity pertaining to distribution of the software without **/
/** specific, written prior permission. **/
/** **/
/** ANDREAS STOLCKE AND SOLBOURNE COMPUTER INC. DISCLAIMS ALL WARRANTIES **/
/** WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF **/
/** MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL ANDREAS STOLCKE **/
/** OR SOLBOURNE BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL **/
/** DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA **/
/** OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER **/
/** TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE **/
/** OR PERFORMANCE OF THIS SOFTWARE. **/
/*****************************************************************************/
/*-
* vroot.h -- Virtual Root Window handling header file
*
* This header file redefines the X11 macros RootWindow and DefaultRootWindow,
* making them look for a virtual root window as provided by certain `virtual'
* window managers like swm and tvtwm. If none is found, the ordinary root
* window is returned, thus retaining backward compatibility with standard
* window managers.
* The function implementing the virtual root lookup remembers the result of
* its last invocation to avoid overhead in the case of repeated calls
* on the same display and screen arguments.
* The lookup code itself is taken from Tom LaStrange's ssetroot program.
*
* Most simple root window changing X programs can be converted to using
* virtual roots by just including
*
* #include <X11/vroot.h>
*
* after all the X11 header files. It has been tested on such popular
* X clients as xphoon, xfroot, xloadimage, and xaqua.
* It also works with the core clients xprop, xwininfo, xwd, and editres
* (and is necessary to get those clients working under tvtwm).
* It does NOT work with xsetroot; get the xsetroot replacement included in
* the tvtwm distribution instead.
*
* Andreas Stolcke <stolcke@ICSI.Berkeley.EDU>, 9/7/90
* - replaced all NULL's with properly cast 0's, 5/6/91
* - free children list (suggested by Mark Martin <mmm@cetia.fr>), 5/16/91
* - include X11/Xlib.h and support RootWindowOfScreen, too 9/17/91
*/
#ifdef VMS
#include "vms_x_fix.h"
#endif
#include <X11/X.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
static Window
VirtualRootWindowOfScreen(Screen * s)
{
static Screen *save_screen = (Screen *) 0;
static Window root = (Window) 0;
if (s != save_screen) {
root = RootWindowOfScreen(s);
/* go look for a virtual root */
#if 0
/*-
* I forget why I put this here....
* With this it screws up the mouse focus with xscreensaver.
*/
if (inroot)
#endif
{
Display *dpy = DisplayOfScreen(s);
Atom __SWM_VROOT;
int i;
Window rootReturn, parentReturn, *children;
unsigned int numChildren;
__SWM_VROOT = XInternAtom(dpy, "__SWM_VROOT", False);
if (XQueryTree(dpy, root, &rootReturn, &parentReturn,
&children, &numChildren)) {
for (i = 0; i < (int) numChildren; i++) {
Atom actual_type;
int actual_format;
unsigned long nitems, bytesafter;
Window *newRoot = (Window *) 0;
if (XGetWindowProperty(dpy, children[i],
__SWM_VROOT, 0, 1, False, XA_WINDOW,
&actual_type, &actual_format,
&nitems, &bytesafter,
(unsigned char **) &newRoot) == Success && newRoot) {
root = *newRoot;
break;
}
}
if (children)
XFree((caddr_t) children);
}
}
save_screen = s;
}
return root;
}
#undef RootWindowOfScreen
#define RootWindowOfScreen(s) VirtualRootWindowOfScreen(s)
#undef RootWindow
#define RootWindow(dpy,s) VirtualRootWindowOfScreen(ScreenOfDisplay(dpy,s))
#undef DefaultRootWindow
#define DefaultRootWindow(dpy) VirtualRootWindowOfScreen(DefaultScreenOfDisplay(dpy))
#endif /* _VROOT_H_ */