XCB/window: catch resize events

modules/video_output/xcb/window.c

@@ -247,7 +247,7 @@ static int Open (vout_window_t *wnd, const vout_window_cfg_t *cfg)
         /* XCB_CW_BACK_PIXEL */
         scr->black_pixel,
         /* XCB_CW_EVENT_MASK */
-        XCB_EVENT_MASK_KEY_PRESS,
+        XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_STRUCTURE_NOTIFY,
     };
 
     xcb_window_t window = xcb_generate_id (conn);
@@ -329,6 +329,15 @@ static int Open (vout_window_t *wnd, const vout_window_cfg_t *cfg)
     /* Make the window visible */
     xcb_map_window (conn, window);
 
+    /* Get the initial mapped size (may differ from requested size) */
+    xcb_get_geometry_reply_t *geo =
+        xcb_get_geometry_reply (conn, xcb_get_geometry (conn, window), NULL);
+    if (geo != NULL)
+    {
+        vout_window_ReportSize(wnd, geo->width, geo->height);
+        free (geo);
+    }
+
     /* Create the event thread. It will dequeue all events, so any checked
      * request from this thread must be completed at this point. */
     if ((p_sys->keys != NULL)
@@ -368,6 +377,30 @@ static void Close (vout_window_t *wnd)
     free (p_sys);
 }
 
+static void ProcessEvent (vout_window_t *wnd, xcb_generic_event_t *ev)
+{
+    vout_window_sys_t *sys = wnd->sys;
+
+    if (sys->keys != NULL && XCB_keyHandler_Process (sys->keys, ev) == 0)
+        return;
+
+    switch (ev->response_type & 0x7f)
+    {
+        case XCB_CONFIGURE_NOTIFY:
+        {
+            xcb_configure_notify_event_t *cne = (void *)ev;
+            vout_window_ReportSize (wnd, cne->width, cne->height);
+            break;
+        }
+        case XCB_MAPPING_NOTIFY:
+            break;
+
+        default:
+            msg_Dbg (wnd, "unhandled event %"PRIu8, ev->response_type);
+    }
+
+    free (ev);
+}
 
 /** Background thread for X11 events handling */
 static void *Thread (void *data)
@@ -389,12 +422,7 @@ static void *Thread (void *data)
 
         int canc = vlc_savecancel ();
         while ((ev = xcb_poll_for_event (conn)) != NULL)
-        {
-            if (XCB_keyHandler_Process (p_sys->keys, ev) == 0)
-                continue;
-            msg_Dbg (wnd, "unhandled event: %"PRIu8, ev->response_type);
-            free (ev);
-        }
+            ProcessEvent(wnd, ev);
         vlc_restorecancel (canc);
 
         if (xcb_connection_has_error (conn))
@@ -583,6 +611,12 @@ static int EmOpen (vout_window_t *wnd, const vout_window_cfg_t *cfg)
 
     p_sys->conn = conn;
 
+    /* Subscribe to window events (_before_ the geometry is queried) */
+    uint32_t mask = XCB_CW_EVENT_MASK;
+    uint32_t value = XCB_EVENT_MASK_STRUCTURE_NOTIFY;
+
+    xcb_change_window_attributes (conn, window, mask, &value);
+
     xcb_get_geometry_reply_t *geo =
         xcb_get_geometry_reply (conn, xcb_get_geometry (conn, window), NULL);
     if (geo == NULL)
@@ -591,21 +625,21 @@ static int EmOpen (vout_window_t *wnd, const vout_window_cfg_t *cfg)
         goto error;
     }
     p_sys->root = geo->root;
+    vout_window_ReportSize(wnd, geo->width, geo->height);
     free (geo);
 
+    /* Try to subscribe to keyboard events (only one X11 client can
+     * subscribe to input events, so this can fail). */
     if (var_InheritBool (wnd, "keyboard-events"))
     {
         p_sys->keys = XCB_keyHandler_Create (VLC_OBJECT(wnd), conn);
         if (p_sys->keys != NULL)
-        {
-            const uint32_t mask = XCB_CW_EVENT_MASK;
-            const uint32_t values[1] = {
-                XCB_EVENT_MASK_KEY_PRESS,
-            };
-            xcb_change_window_attributes (conn, window, mask, values);
-        }
+            value |= XCB_EVENT_MASK_KEY_PRESS;
     }
 
+    if (value & ~XCB_EVENT_MASK_STRUCTURE_NOTIFY)
+        xcb_change_window_attributes (conn, window, mask, &value);
+
     CacheAtoms (p_sys);
     if ((p_sys->keys != NULL)
      && vlc_clone (&p_sys->thread, Thread, wnd, VLC_THREAD_PRIORITY_LOW))