[PATCH] dix: mark motion events as emulated if we're scrolling from button press

[Peter Hutterer]

The protocol requires that the emulated event is marked as such. So if a
driver with smooth scrolling axis sends legacy button events, the motion
event must be marked as emulated.

Pass the real type to emulate_scroll_button_events and create the events
accordingly. For real button press or relase events, only that event must be
generated since a release event will follow or a press event has already
occured, respectively. (This fixes a bug where we'd get two release events
for each legacy button event)

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 dix/getevents.c |   31 ++++++++++++++++++++++---------
 1 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/dix/getevents.c b/dix/getevents.c
index adf945f..c55e1a0 100644
--- a/dix/getevents.c
+++ b/dix/getevents.c
@@ -1294,6 +1294,7 @@ fill_pointer_events(InternalEvent *events, DeviceIntPtr pDev, int type,
  *
  * @param events The pointer to the event list to fill the events
  * @param dev The device to generate the events for
+ * @param type The real type of the event
  * @param axis The axis number to generate events for
  * @param mask State before this event in absolute coords
  * @param[in,out] last Last scroll state posted in absolute coords (modified
@@ -1305,6 +1306,7 @@ fill_pointer_events(InternalEvent *events, DeviceIntPtr pDev, int type,
 static int
 emulate_scroll_button_events(InternalEvent *events,
                              DeviceIntPtr dev,
+                             int type,
                              int axis,
                              const ValuatorMask *mask,
                              ValuatorMask *last,
@@ -1317,6 +1319,7 @@ emulate_scroll_button_events(InternalEvent *events,
     int num_events = 0;
     double total;
     int b;
+    int flags = 0;
 
     if (dev->valuator->axes[axis].scroll.type == SCROLL_TYPE_NONE)
         return 0;
@@ -1327,6 +1330,9 @@ emulate_scroll_button_events(InternalEvent *events,
     ax = &dev->valuator->axes[axis];
     incr = ax->scroll.increment;
 
+    if (type != ButtonPress && type != ButtonRelease)
+        flags |= POINTER_EMULATED;
+
     if (!valuator_mask_isset(last, axis))
         valuator_mask_set_double(last, axis, 0);
 
@@ -1354,14 +1360,19 @@ emulate_scroll_button_events(InternalEvent *events,
          */
         if (num_events + 4 < max_events)
         {
-            nev_tmp = fill_pointer_events(events, dev, ButtonPress, b, ms,
-                                          POINTER_EMULATED, NULL);
-            events += nev_tmp;
-            num_events += nev_tmp;
-            nev_tmp = fill_pointer_events(events, dev, ButtonRelease, b, ms,
-                                          POINTER_EMULATED, NULL);
-            events += nev_tmp;
-            num_events += nev_tmp;
+            if (type != ButtonRelease) {
+                nev_tmp = fill_pointer_events(events, dev, ButtonPress, b, ms,
+                                              flags, NULL);
+                events += nev_tmp;
+                num_events += nev_tmp;
+            }
+            if (type != ButtonPress)
+            {
+                nev_tmp = fill_pointer_events(events, dev, ButtonRelease, b, ms,
+                                              flags, NULL);
+                events += nev_tmp;
+                num_events += nev_tmp;
+            }
         }
     }
 
@@ -1406,6 +1417,7 @@ GetPointerEvents(InternalEvent *events, DeviceIntPtr pDev, int type,
     ValuatorMask mask;
     ValuatorMask scroll;
     int i;
+    int realtype = type;
 
     /* refuse events from disabled devices */
     if (!pDev->enabled)
@@ -1458,6 +1470,7 @@ GetPointerEvents(InternalEvent *events, DeviceIntPtr pDev, int type,
             valuator_mask_set_double(&mask, axis, val);
             type = MotionNotify;
             buttons = 0;
+            flags |= POINTER_EMULATED;
         }
     }
 
@@ -1477,7 +1490,7 @@ GetPointerEvents(InternalEvent *events, DeviceIntPtr pDev, int type,
 
         valuator_mask_set_double(&scroll, i, pDev->last.valuators[i]);
 
-        nev_tmp = emulate_scroll_button_events(events, pDev, i, &scroll,
+        nev_tmp = emulate_scroll_button_events(events, pDev, realtype, i, &scroll,
                                                pDev->last.scroll, ms,
                                                GetMaximumEventsNum() - num_events);
         events += nev_tmp;
-- 
1.7.6.4