-/* values for key_status */
-#define KEY_NOT_PRESSED FALSE
-#define KEY_RELEASED FALSE
-#define KEY_PRESSED TRUE
+
+static boolean cursor_inside_playfield = FALSE;
+static boolean playfield_cursor_set = FALSE;
+static unsigned long playfield_cursor_delay = 0;
+
+
+/* event filter especially needed for SDL event filtering due to
+ delay problems with lots of mouse motion events when mouse button
+ not pressed (X11 can handle this with 'PointerMotionHintMask') */
+
+int FilterMouseMotionEvents(const Event *event)
+{
+ MotionEvent *motion;
+
+ /* non-motion events are directly passed to event handler functions */
+ if (event->type != EVENT_MOTIONNOTIFY)
+ return 1;
+
+ motion = (MotionEvent *)event;
+ cursor_inside_playfield = (motion->x >= SX && motion->x < SX + SXSIZE &&
+ motion->y >= SY && motion->y < SY + SYSIZE);
+
+ if (game_status == GAME_MODE_PLAYING && playfield_cursor_set)
+ {
+ SetMouseCursor(CURSOR_DEFAULT);
+ playfield_cursor_set = FALSE;
+ DelayReached(&playfield_cursor_delay, 0);
+ }
+
+ /* skip mouse motion events without pressed button outside level editor */
+ if (button_status == MB_RELEASED && game_status != GAME_MODE_EDITOR &&
+ game_status != GAME_MODE_PLAYING)
+ return 0;
+ else
+ return 1;
+}
+
+/* this is only really needed for non-SDL targets to filter unwanted events;
+ when using SDL with properly installed event filter, this function can be
+ replaced with a simple "NextEvent()" call, but it doesn't hurt either */
+
+static boolean NextValidEvent(Event *event)
+{
+ while (PendingEvent())
+ {
+ NextEvent(event);
+
+ if (FilterMouseMotionEvents(event))
+ return TRUE;
+ }
+
+ return FALSE;
+}