[目次] (https://qiita.com/Yutaka_Aoki/items/9d38ea98406f4096435b)

Inside Wine; WM_MOUSEMOVE メッセージの生成

通常時、WM_MOUSEMOVE がキューへ追加される時の実行経路

X11DRV_MsgWaitForMultipleObjectsEx()
--> process_events()
---> call_event_handler( Display *display, XEvent *event )
---> handlers[event->type]( hwnd, event );
      event->type = MotionNotify (6)
---> X11DRV_MotionNotify( HWND hwnd, XEvent *xev )
      XMotionEvent *event = &xev->xmotion;
      INPUT input;
---> send_mouse_input( hwnd, event->window, event->state, &input );
---> __wine_send_input( HWND hwnd, const INPUT *input )
---> send_hardware_message( hwnd, input, 0 );
      SERVER_START_REQ( send_hardware_message ) {
        switch (input->type)
        case INPUT_MOUSE:
      }
---> wine_server_call( req );
---> DECL_HANDLER(send_hardware_message)
     (send a hardware message to a thread queue)
---> queue_mouse_message( desktop, req->win, &req->input, req->flags, sender );
     messages[MOUSEEVENTF_MOVE (1)] = WM_MOUSEMOVE
---> queue_hardware_message() : WM_MOUSEMOVE
        list_add_tail( &input->msg_list, &msg->entry );
        set_queue_bits( thread->queue, get_hardware_msg_bit(msg) );
--->
    if (!always_queue || merge_message( input, msg )) free_message( msg );
    else {
        msg->unique_id = 0;  /* will be set once we return it to the app */
        list_add_tail( &input->msg_list, &msg->entry );
        set_queue_bits( thread->queue, get_hardware_msg_bit(msg) );
    }

WM_NCMOUSEMOVE は WM_MOUSEMOVE から修正される

PeekMessageW() または GetMessageW() の中で、hittest が HTCLIENT 以外
の場合は、WM_MOUSEMOVE が WM_NCMOUSEMOVE に修正される :

PeekMessageW() または、GetMessageW()
---> peek_message()
---> switch(info.type)
　　 case MSG_HARDWARE :
---> process_hardware_message()
---> process_mouse_message() {
　　 if (hittest != HTCLIENT) {
　　　 message += WM_NCMOUSEMOVE - WM_MOUSEMOVE;
　　　 wparam = hittest;
　　 }

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