From 375d627a7abd0c07b95d70395ce89b2f4c42d106 Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Wed, 28 Oct 2026 13:10:58 -0400
Subject: tools/guest-diag: guest frame capture + input driving for the two-VM
 GZDoom video (Xvfb XGetImage capture, SDL present shim, window resize, XTEST
 input, QGA range fetch)

---
 tools/guest-diag/xresize.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 tools/guest-diag/xresize.c

(limited to 'tools/guest-diag/xresize.c')

diff --git a/tools/guest-diag/xresize.c b/tools/guest-diag/xresize.c
new file mode 100644
index 0000000..877f0e9
--- /dev/null
+++ b/tools/guest-diag/xresize.c
@@ -0,0 +1,66 @@
+// 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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