Add a function for sending XEMBED messages

meson.build

@@ -33,6 +33,7 @@ threads_dep = dependency('threads')
 # The built in threads dependency does not know how to handle winegcc
 wine_threads_dep = declare_dependency(link_args : '-lpthread')
 xcb_dep = dependency('xcb')
+xcb_ewmh_dep = dependency('xcb-ewmh')
 
 include_dir = include_directories('src/include')
 
@@ -62,7 +63,7 @@ executable(
   ],
   native : false,
   include_directories : include_dir,
-  dependencies : [boost_dep, bitsery_dep, wine_threads_dep, xcb_dep],
+  dependencies : [boost_dep, bitsery_dep, wine_threads_dep, xcb_dep, xcb_ewmh_dep],
   cpp_args : compiler_options,
   link_args : []
 )

src/wine-host/editor.cpp

@@ -1,5 +1,8 @@
 #include "editor.h"
 
+#include <xcb/xcb_ewmh.h>
+
+constexpr char xembed_proeprty[] = "_XEMBED";
 constexpr char xembed_info_proeprty[] = "_XEMBED_INFO";
 
 ATOM register_window_class(std::string window_class_name);
@@ -10,10 +13,14 @@ Editor::Editor(std::string window_class_name)
     // We need a bunch of property atoms for the XEmbed protocol
     xcb_generic_error_t* err;
 
+    const auto xembed_cookie = xcb_intern_atom(
+        x11_connection.get(), 0, strlen(xembed_proeprty), xembed_proeprty);
     const auto xembed_info_cookie =
         xcb_intern_atom(x11_connection.get(), 0, strlen(xembed_info_proeprty),
                         xembed_info_proeprty);
 
+    xcb_xembed =
+        xcb_intern_atom_reply(x11_connection.get(), xembed_cookie, &err)->atom;
     xcb_xembed_info =
         xcb_intern_atom_reply(x11_connection.get(), xembed_info_cookie, &err)
             ->atom;
@@ -126,6 +133,19 @@ std::optional<size_t> Editor::get_x11_handle() {
         GetProp(win32_handle.value().get(), "__wine_x11_whole_window"));
 }
 
+void Editor::send_xembed_event(const xcb_window_t& window,
+                               const uint32_t message,
+                               const uint32_t detail,
+                               const uint32_t data1,
+                               const uint32_t data2) {
+    const std::array<uint32_t, 5> event_data{XCB_TIME_CURRENT_TIME, message,
+                                             detail, data1, data2};
+
+    xcb_ewmh_send_client_message(x11_connection.get(), window, window,
+                                 xcb_xembed, event_data.size(),
+                                 event_data.data());
+}
+
 ATOM register_window_class(std::string window_class_name) {
     WNDCLASSEX window_class{};
 

src/wine-host/editor.h

@@ -70,6 +70,17 @@ class Editor {
      */
     std::optional<size_t> get_x11_handle();
 
+    /**
+     * Send an XEmbed message to a window. See the spec for more information.
+     *
+     * https://specifications.freedesktop.org/xembed-spec/xembed-spec-latest.html#lifecycle
+     */
+    void send_xembed_event(const xcb_window_t& window,
+                           const uint32_t message,
+                           const uint32_t detail,
+                           const uint32_t data1,
+                           const uint32_t data2);
+
     /**
      * The Win32 window class registered for the window window.
      */
@@ -84,5 +95,6 @@ class Editor {
         win32_handle;
 
     std::unique_ptr<xcb_connection_t, decltype(&xcb_disconnect)> x11_connection;
+    xcb_atom_t xcb_xembed;
     xcb_atom_t xcb_xembed_info;
 };