tools/guest-diag: working guest-GL capture and input for virtio-gpu virgl guests (SDL swap-hook capture; XSendEvent input - SDL ignores XTEST here; region capture, focus query, window resize)

1 files changed, 69 insertions, 0 deletions

diff --git a/tools/guest-diag/xfocus.c b/tools/guest-diag/xfocus.c
new file mode 100644
index 0000000..e0ec05d
--- /dev/null
+++ b/tools/guest-diag/xfocus.c
@@ -0,0 +1,69 @@
+// xfocus.c - print the current X input focus and the gzdoom window, and try
+// to focus the gzdoom window; then report again. Diagnostic for WM-less X.
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <stdio.h>
+#include <string.h>
+
+static Window find_named(Display *d, Window root, const char *sub,
+                         char *title, size_t tl)
+{
+    Window r, parent, *kids = NULL;
+    unsigned int nk = 0;
+
+    title[0] = 0;
+    if (!XQueryTree(d, root, &r, &parent, &kids, &nk))
+        return 0;
+    for (unsigned int i = 0; i < nk; i++) {
+        char *name = NULL;
+
+        if (XFetchName(d, kids[i], &name) && name) {
+            if (strstr(name, sub)) {
+                snprintf(title, tl, "%s", name);
+                Window w = kids[i];
+
+                XFree(name);
+                if (kids)
+                    XFree(kids);
+                return w;
+            }
+            XFree(name);
+        }
+    }
+    if (kids)
+        XFree(kids);
+    return 0;
+}
+
+int main(void)
+{
+    Display *d = XOpenDisplay(NULL);
+    Window root, focus, w, croot;
+    int rx, ry, wx, wy;
+    unsigned int mask;
+    char title[256];
+
+    if (!d) {
+        printf("no display\n");
+        return 1;
+    }
+    root = DefaultRootWindow(d);
+    w = find_named(d, root, "Freedoom", title, sizeof(title));
+    XGetInputFocus(d, &focus, &rx);
+    printf("gzdoom window: 0x%lx '%s'\n", w, title);
+    printf("input focus:   0x%lx\n", focus);
+    printf("pointer window: ");
+    if (XQueryPointer(d, root, &croot, &rx /*reuse*/, &wx, &wy, &rx, &ry,
+                      &mask))
+        printf("0x%lx at %d,%d mask=0x%x\n", rx, wx, wy, mask);
+    else
+        printf("query failed\n");
+    if (w) {
+        XSetInputFocus(d, w, RevertToParent, CurrentTime);
+        XFlush(d);
+        XGetInputFocus(d, &focus, &rx);
+        printf("after set:     0x%lx\n", focus);
+    }
+    XCloseDisplay(d);
+    return 0;
+}