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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 "xli.h"
#define RETAIN_PROP_NAME "_XSETROOT_ID"
static void updateProperty(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(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(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((caddr_t) pm);
} else if (actual_type != None) {
fprintf(stderr, "%s: warning: invalid format encountered for property %s\n",
"xli", RETAIN_PROP_NAME);
}
}
/* this returns the root window for DECWindows servers. this is right
* out of xsetroot with minor formatting changes.
* (Later DEC OSF/1 releases don't need this stuff)
*/
static Window getWmRootWindow(Display * dpy, Window root)
{
Window parent, retv;
Window *child;
unsigned int nchildren;
XWindowAttributes rootatt, childatt;
retv = None;
if (!XGetWindowAttributes(dpy, root, &rootatt)) {
fprintf(stderr, "XGetWindowAttributes on root failed.\n");
exit(1);
}
if (XQueryTree(dpy, root, &root, &parent, &child, &nchildren)) {
int i;
for (i = 0; i < nchildren; i++) {
if (!XGetWindowAttributes(dpy, child[i], &childatt)) {
XFree((caddr_t) child);
fprintf(stderr, "XGetWindowAttributes on child failed.\n");
exit(1);
}
if ((rootatt.width == childatt.width) &&
(rootatt.height == childatt.height))
retv = child[i];
}
XFree((caddr_t) child);
return retv;
} else {
fprintf(stderr, "XQueryTree failed (window doesn't exist).\n");
exit(1);
}
}
static Window getDECRootWindow(Display * dpy, Window root)
{
Window temporary_rootW;
temporary_rootW = getWmRootWindow(dpy, root);
return (getWmRootWindow(dpy, temporary_rootW));
}
void imageOnRoot(DisplayInfo * dinfo, Image * image, ImageOptions * options)
{
Display *disp = dinfo->disp;
int scrn = dinfo->scrn;
Pixmap pixmap;
XImageInfo *ximageinfo;
Atom __SWM_VROOT = None;
Window root, rootReturn, parentReturn, *children;
unsigned int numChildren;
int i;
char *s;
if (globals.dest_window)
root = globals.dest_window;
else {
root = RootWindow(disp, scrn);
/* look for DECWindows servers because they do strange stuff with the
* root window. they should be shot for that one.
* (Later DEC OSF/1 releases don't need this stuff)
*/
for (s = ServerVendor(disp); *s; s++)
if (!strncmp(s, "DECWINDOWS", 10) &&
!xlistrstr(s, "OSF/1"))
root = getDECRootWindow(disp, root);
/* 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;
}
}
XFree((caddr_t) children);
}
freePrevious(disp, root);
if (!(ximageinfo = imageToXImage(disp, scrn,
DefaultVisual(disp, scrn),
DefaultDepth(disp, scrn),
image, FALSE, TRUE, options))) {
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);
ximageinfo->rootimage = TRUE; /* make sure colors arn't freed */
freeXImage(image, ximageinfo);
preserveResource(disp, root);
}
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