quartz: add evil casting to make sure time wraps correctly on 32bit machines

get_time_from_ns_event(): apply patch from Michael Hutchinson which
makes sure the returned guint32 wraps correctly on 32 bit machines
when the uptime exceeds 2^32 ms.

diff --git a/gdk/quartz/gdkevents-quartz.c b/gdk/quartz/gdkevents-quartz.c
index 4921fcd510aad1809530ce55ad0c9ad28ad5a6f9..0c4c240793af550592e5e5a2b72f66f631911645 100644 (file)
--- a/gdk/quartz/gdkevents-quartz.c
+++ b/gdk/quartz/gdkevents-quartz.c
@@ -172,8 +172,11 @@ static guint32
 get_time_from_ns_event (NSEvent *event)
 {
   double time = [event timestamp];
-  
-  return time * 1000.0;
+
+  /* cast via double->uint64 conversion to make sure that it is
+   * wrapped on 32-bit machines when it overflows
+   */
+  return (guint32) (guint64) (time * 1000.0);
 }
 
 static int