commit 21ed660f30a3f96c787ab00a16499e0fb034b2ad
Author: Chris Humbert <freedesktop@mahadri.com>
Date:   Fri May 7 17:02:43 2010 +1000

    dix: make DeviceEvent coordinates signed for Xinerama. #24986
    
    With Xinerama enabled, event coordinates are relative to Screen 0, so
    they can be negative.  The new DeviceEvent's coordinates are of type
    uint16_t, making screens above and to the left of Screen 0 unusable.
    
    X.Org Bug 24986 <https://bugs.freedesktop.org/show_bug.cgi?id=24986>
    
    Signed-off-by: Chris Humbert <freedesktop@mahadri.com>
    Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
    Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/include/eventstr.h b/include/eventstr.h
index 79685c1..433227e 100644
--- a/include/eventstr.h
+++ b/include/eventstr.h
@@ -91,9 +91,9 @@ struct _DeviceEvent
         uint32_t button;  /**< Button number */
         uint32_t key;     /**< Key code */
     } detail;
-    uint16_t root_x;      /**< Pos relative to root window in integral data */
+    int16_t root_x;       /**< Pos relative to root window in integral data */
     float root_x_frac;    /**< Pos relative to root window in frac part */
-    uint16_t root_y;      /**< Pos relative to root window in integral part */
+    int16_t root_y;       /**< Pos relative to root window in integral part */
     float root_y_frac;    /**< Pos relative to root window in frac part */
     uint8_t    buttons[(MAX_BUTTONS + 7)/8]; /**< Button mask */
     struct {