[PATCH weston] compositor-rdp: Correct mouse scrolling direction

[Jason Gerecke]

The direction of scrolling in the RDP compositor appears to be inverted.
When using Weston directly in X, sending X11 button 4 cuases window
contents to scroll up and button 4 to be reported to xwayland clients.
Conversely, when using Weston through RDP (xfreerdp client), sending
X11 button 4 causes window contents to scroll down and button 5 to be
reported to xwayland clients. The xfreerdp client does not seem to be
the cause of this since scrolling works correctly when connecting to
a Windows host.

Signed-off-by: Jason Gerecke <jason.gerecke at wacom.com>
---
 libweston/compositor-rdp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libweston/compositor-rdp.c b/libweston/compositor-rdp.c
index 4a4dc696..ee68e969 100644
--- a/libweston/compositor-rdp.c
+++ b/libweston/compositor-rdp.c
@@ -1062,7 +1062,7 @@ xf_mouseEvent(rdpInput *input, UINT16 flags, UINT16 x, UINT16 y)
 		 *
 		 * https://blogs.msdn.microsoft.com/oldnewthing/20130123-00/?p=5473 explains the 120 value
 		 */
-		value = (flags & 0xff) / 120.0;
+		value = -(flags & 0xff) / 120.0;
 		if (flags & PTR_FLAGS_WHEEL_NEGATIVE)
 			value = -value;
 
-- 
2.16.1