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/* root.c:
*
* this loads an image onto the root window. changes to allow proper
* freeing of previously allocated resources made by Deron Dann Johnson
* (dj@eng.sun.com).
*
* jim frost 10.03.89
*
* Copyright 1989, 1990, 1991 Jim Frost.
* See included file "copyright.h" for complete copyright information.
*/
#include "copyright.h"
#include "xloadimage.h"
#include <X11/Xatom.h>
#define RETAIN_PROP_NAME "_XSETROOT_ID"
void updateProperty(dpy, w, name, type, format, data, nelem)
Display *dpy;
Window w;
char *name;
Atom type;
int format;
int data;
int nelem;
{
/* intern the property name */
Atom atom = XInternAtom(dpy, name, 0);
/* create or replace the property */
XChangeProperty(dpy, w, atom, type, format, PropModeReplace,
(unsigned char *)&data, nelem);
}
/* Sets the close-down mode of the client to 'RetainPermanent'
* so all client resources will be preserved after the client
* exits. Puts a property on the default root window containing
* an XID of the client so that the resources can later be killed.
*/
static void
preserveResource(dpy, w)
Display *dpy;
Window w;
{
/* create dummy resource */
Pixmap pm= XCreatePixmap(dpy, w, 1, 1, 1);
/* create/replace the property */
updateProperty(dpy, w, RETAIN_PROP_NAME, XA_PIXMAP, 32, (int)pm, 1);
/* retain all client resources until explicitly killed */
XSetCloseDownMode(dpy, RetainPermanent);
}
/* Flushes any resources previously retained by the client,
* if any exist.
*/
static void
freePrevious(dpy, w)
Display *dpy;
Window w;
{
Pixmap *pm;
Atom actual_type; /* NOTUSED */
int format;
int nitems;
int bytes_after;
/* intern the property name */
Atom atom = XInternAtom(dpy, RETAIN_PROP_NAME, 0);
/* look for existing resource allocation */
if ((XGetWindowProperty(dpy, w, atom, 0, 1, 1/*delete*/,
AnyPropertyType, &actual_type, &format, (unsigned long *)&nitems,
(unsigned long *)&bytes_after, (unsigned char **)&pm) == Success) &&
nitems == 1) {
if ((actual_type == XA_PIXMAP) && (format == 32) &&
(nitems == 1) && (bytes_after == 0)) {
/* blast it away */
XKillClient(dpy, (XID) *pm);
XFree((char *)pm);
}
else if (actual_type != None) {
fprintf(stderr,
"%s: warning: invalid format encountered for property %s\n",
RETAIN_PROP_NAME, "xloadimage");
}
}
}
#if FIND_DEC_ROOTWINDOW
/* this returns the root window for DECWindows servers. this is right
* out of xsetroot with minor formatting changes.
*/
static Window getWmRootWindow(dpy, root)
Display *dpy;
Window root;
{
Window parent;
Window *child;
unsigned int nchildren;
XWindowAttributes rootatt, childatt;
if (!XGetWindowAttributes (dpy, root, &rootatt))
return(0);
if (XQueryTree (dpy, root, &root, &parent, &child, &nchildren)) {
int i;
for (i = 0; i < nchildren; i++) {
if (!XGetWindowAttributes (dpy, child[i], &childatt))
continue;
if ((rootatt.width == childatt.width) &&
(rootatt.height == childatt.height))
return child[i];
}
return root;
}
else
return((Window)0);
}
static Window getDECRootWindow(dpy, root)
Display *dpy;
Window root;
{
Window temporary_rootW;
if (!(temporary_rootW = getWmRootWindow(dpy, root)) ||
!(temporary_rootW = getWmRootWindow(dpy, temporary_rootW))) {
fprintf(stderr, "Can't find false root window on DECWINDOWS server, using true root\n");
return(root);
}
return(temporary_rootW);
}
#endif /* FIND_DEC_ROOTWINDOW */
void imageOnRoot(disp, scrn, image, options, verbose)
Display *disp;
int scrn;
Image *image;
OptionSet *options;
unsigned int verbose;
{ Option *opt;
Pixmap pixmap;
XImageInfo *ximageinfo;
Atom __SWM_VROOT = None;
Window root, rootReturn, parentReturn, *children;
unsigned int numChildren;
int i;
#ifdef FIND_DEC_ROOTWINDOW
char *s;
#endif /* FIND_DEC_ROOTWINDOW */
if ((opt= getOption(options, WINDOWID)))
root= opt->info.windowid;
else {
root = RootWindow(disp, scrn);
#ifdef FIND_DEC_ROOTWINDOW
/* look for DECWindows servers because they do strange stuff with the
* root window. they should be shot for that one.
*
* some X terminal vendors put DECWINDOWS in their vendor string to
* get DEC X utilities to work. to get around them, we look for
* the string "DECWINDOWS Digital" because as of this writing DEC's
* vendorstrings look like "DECWINDOWS DigitalEquipmentCorporation".
*/
for (s= ServerVendor(disp); *s; s++)
if (!strncmp(s, "DECWINDOWS Digital", 18))
root= getDECRootWindow(disp, scrn);
#endif /* FIND_DEC_ROOTWINDOW */
/* Added for window managers like swm and tvtwm that follow solbourne's
* virtual root window concept.
*/
__SWM_VROOT = XInternAtom(disp, "__SWM_VROOT", False);
XQueryTree(disp, root, &rootReturn, &parentReturn, &children, &numChildren);
for(i = 0; i < numChildren; i++) {
Atom actual_type;
int actual_format;
long nitems, bytesafter;
Window *newRoot = NULL;
if (XGetWindowProperty (disp, children[i], __SWM_VROOT,0,1,
False, XA_WINDOW, &actual_type, &actual_format,
(unsigned long *)&nitems, (unsigned long *)&bytesafter,
(unsigned char **) &newRoot) ==
Success && newRoot) {
root = *newRoot;
break;
}
}
}
freePrevious(disp, root);
if (! (ximageinfo= imageToXImage(disp, scrn,
DefaultVisual(disp, scrn),
DefaultDepth(disp, scrn),
image, False, True, verbose))) {
fprintf(stderr, "Cannot convert Image to XImage\n");
exit(1);
}
if ((pixmap= ximageToPixmap(disp, root, ximageinfo)) == None) {
printf("Cannot create background (not enough resources, sorry)\n");
exit(1);
}
/* changing the root colormap is A Bad Thing, so deny it.
*/
if (ximageinfo->cmap != DefaultColormap(disp, scrn)) {
printf("Loading image onto root would change default colormap (sorry)\n");
XFreePixmap(disp, pixmap);
exit(1);
}
XSetWindowBackgroundPixmap(disp, root, pixmap);
XClearWindow(disp, root);
XFreePixmap(disp, pixmap);
freeXImage(image, ximageinfo);
preserveResource(disp, root);
}
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