[PATCH v2 3/6] server: Merge WM_POINTERUPDATE messages.

[Paul Gofman]

From: Paul Gofman

---
 server/queue.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/server/queue.c b/server/queue.c
index 44d13122cfc..4ac6a670cd7 100644
--- a/server/queue.c
+++ b/server/queue.c
@@ -891,6 +891,35 @@ static int merge_unique_message( struct thread_input *input, unsigned int messag
     return 1;
 }

+/* try to merge pointer update message with the last in the list; return 1 if successful */
+static int merge_pointerupdate( struct thread_input *input, const struct message *msg )
+{
+    struct message *prev;
+
+    LIST_FOR_EACH_ENTRY_REV( prev, &input->msg_list, struct message, entry )
+    {
+        if (prev->msg == msg->msg) break;
+        if (prev->msg >= WM_POINTERUPDATE && prev->msg <= WM_POINTERLEAVE) return 0;
+    }
+
+    if (&prev->entry == &input->msg_list) return 0;
+
+    if (prev->result) return 0;
+    if (prev->win != msg->win) return 0;
+    if (prev->type != msg->type) return 0;
+    if (prev->wparam != msg->wparam) return 0;
+    if (prev->lparam != msg->lparam) return 0;
+
+    /* now we can merge it */
+    prev->x       = msg->x;
+    prev->y       = msg->y;
+    prev->time    = msg->time;
+    list_remove( &prev->entry );
+    list_add_tail( &input->msg_list, &prev->entry );
+
+    return 1;
+}
+
 /* try to merge a message with the messages in the list; return 1 if successful */
 static int merge_message( struct thread_input *input, const struct message *msg )
 {
@@ -898,6 +927,7 @@ static int merge_message( struct thread_input *input, const struct message *msg
     if (msg->msg == WM_MOUSEMOVE) return merge_mousemove( input, msg );
     if (msg->msg == WM_WINE_CLIPCURSOR) return merge_unique_message( input, WM_WINE_CLIPCURSOR, msg );
     if (msg->msg == WM_WINE_SETCURSOR) return merge_unique_message( input, WM_WINE_SETCURSOR, msg );
+    if (msg->msg == WM_POINTERUPDATE) return merge_pointerupdate( input, msg );
     return 0;
 }