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Diffstat (limited to 'libkscreensaver/kscreensaver_vroot.h')
| -rw-r--r-- | libkscreensaver/kscreensaver_vroot.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/libkscreensaver/kscreensaver_vroot.h b/libkscreensaver/kscreensaver_vroot.h new file mode 100644 index 000000000..62ac73889 --- /dev/null +++ b/libkscreensaver/kscreensaver_vroot.h @@ -0,0 +1,132 @@ +/*****************************************************************************/ +/** 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 + */ + +#ifndef _VROOT_H_ +#define _VROOT_H_ + +#if !defined(lint) && !defined(SABER) +static const char vroot_rcsid[] = "#Id: vroot.h,v 1.4 1991/09/30 19:23:16 stolcke Exp stolcke #"; +#endif + +#include <qwidget.h> +#ifdef Q_WS_X11 +#include <X11/X.h> +#include <X11/Xatom.h> +#include <X11/Xlib.h> + +static Window +#if defined(__STDC__) || defined(__cplusplus) /* ANSIfication added by jwz, to avoid superfluous warnings. */ +VirtualRootWindowOfScreen(Screen *screen) +#else /* !__STDC__ */ +VirtualRootWindowOfScreen(screen) Screen *screen; +#endif /* !__STDC__ */ +{ + static Screen *save_screen = (Screen *)0; + static Window root = (Window)0; + + if (screen != save_screen) { + Display *dpy = DisplayOfScreen(screen); + Atom __SWM_VROOT = None; + uint i; + Window rootReturn, parentReturn, *children; + unsigned int numChildren; + + root = RootWindowOfScreen(screen); + + /* go look for a virtual root */ + __SWM_VROOT = XInternAtom(dpy, "__SWM_VROOT", False); + if (XQueryTree(dpy, root, &rootReturn, &parentReturn, + &children, &numChildren)) { + for (i = 0; i < numChildren; i++) { + Atom actual_type; + int actual_format; + unsigned long nitems, bytesafter; + unsigned char *newRoot = 0; + + if (XGetWindowProperty(dpy, children[i], + __SWM_VROOT, 0, 1, False, XA_WINDOW, + &actual_type, &actual_format, + &nitems, &bytesafter, + &newRoot) == Success + && newRoot) + { + void *tmpRoot = (void *) newRoot; + root = *(Window*) tmpRoot; + XFree( (char*) newRoot ); + break; + } + } + if (children) + XFree((char *)children); + } + + save_screen = screen; + } + + return root; +} + +#undef RootWindowOfScreen +#define RootWindowOfScreen(s) VirtualRootWindowOfScreen(s) + +#undef RootWindow +#define RootWindow(dpy,screen) VirtualRootWindowOfScreen(ScreenOfDisplay(dpy,screen)) + +#undef DefaultRootWindow +#define DefaultRootWindow(dpy) VirtualRootWindowOfScreen(DefaultScreenOfDisplay(dpy)) +#endif + +#endif /* _VROOT_H_ */ |