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// SPDX-License-Identifier: BSD-3-Clause
// xresize.c - find a window by name substring and resize/move it (Xvfb has
// no WM, so a client-side XMoveResizeWindow is the only way to force the
// game window onto the screen).
// Usage: xresize <display> <name-substr> <w> <h> <x> <y>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
static Window find_named(Display *d, Window root, const char *sub)
{
Window r, parent, *kids = NULL;
unsigned int nkids = 0;
if (!XQueryTree(d, root, &r, &parent, &kids, &nkids))
return 0;
for (unsigned int i = 0; i < nkids; i++) {
char *name = NULL;
if (XFetchName(d, kids[i], &name) && name) {
int hit = strstr(name, sub) != NULL;
XFree(name);
if (hit) {
Window w = kids[i];
if (kids)
XFree(kids);
return w;
}
}
}
if (kids)
XFree(kids);
return 0;
}
int main(int argc, char **argv)
{
Display *d;
Window w;
if (argc < 6) {
fprintf(stderr, "usage: xresize <display> <name> <w> <h> <x> <y>\n");
return 2;
}
d = XOpenDisplay(argv[1]);
if (!d) {
fprintf(stderr, "no display\n");
return 1;
}
w = find_named(d, DefaultRootWindow(d), argv[2]);
if (!w) {
fprintf(stderr, "window '%s' not found\n", argv[2]);
return 1;
}
XMoveResizeWindow(d, w, atoi(argv[5]), atoi(argv[6]), atoi(argv[3]),
atoi(argv[4]));
XFlush(d);
printf("resized 0x%lx to %sx%s at %s,%s\n", w, argv[3], argv[4],
argv[5], argv[6]);
XCloseDisplay(d);
return 0;
}
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