I do fear that with some devices your patch will collapse too many
events and make it harder to follow small radius curves.
Right, I did not consider this case. If this is a problem, perhaps
the code could be changed to only collapse a pair of DELTA_X and
DELTA_Y events, but never more than that. This way it might still
incorrectly merge two independent motions along the axes into one
diagonal motion, but I would expect that to be rare, and the deltas
to be so small that it has very little impact on anything.
Here's a diff that does just that. If ws receives more than one
delta along an axis, it will not sum these; each will go in a separate
event. But if it gets an X delta followed by an Y delta (or vice versa),
these will be combined into a single event.
Index: xenocara/driver/xf86-input-ws/src/ws.c
===
RCS file: /cvs/xenocara/driver/xf86-input-ws/src/ws.c,v
retrieving revision 1.57
diff -u -p -r1.57 ws.c
--- xenocara/driver/xf86-input-ws/src/ws.c 8 Jul 2012 14:22:03 -
1.57
+++ xenocara/driver/xf86-input-ws/src/ws.c 8 Jul 2013 17:12:27 -
@@ -474,7 +474,7 @@ wsReadInput(InputInfoPtr pInfo)
{
WSDevicePtr priv = (WSDevicePtr)pInfo-private;
static struct wscons_event eventList[NUMEVENTS];
- int n, c;
+ int n, c, dx, dy;
struct wscons_event *event = eventList;
unsigned char *pBuf;
@@ -488,10 +488,11 @@ wsReadInput(InputInfoPtr pInfo)
if (n == 0)
return;
+ dx = dy = 0;
n /= sizeof(struct wscons_event);
while (n--) {
int buttons = priv-lastButtons;
- int dx = 0, dy = 0, dz = 0, dw = 0, ax = 0, ay = 0;
+ int newdx = 0, newdy = 0, dz = 0, dw = 0, ax = 0, ay = 0;
int zbutton = 0, wbutton = 0;
switch (event-type) {
@@ -506,11 +507,17 @@ wsReadInput(InputInfoPtr pInfo)
buttons));
break;
case WSCONS_EVENT_MOUSE_DELTA_X:
- dx = event-value;
+ if (!dx)
+ dx = event-value;
+ else
+ newdx = event-value;
DBG(4, ErrorF(Relative X %d\n, event-value));
break;
case WSCONS_EVENT_MOUSE_DELTA_Y:
- dy = -event-value;
+ if (!dy)
+ dy = -event-value;
+ else
+ newdy = -event-value;
DBG(4, ErrorF(Relative Y %d\n, event-value));
break;
case WSCONS_EVENT_MOUSE_ABSOLUTE_X:
@@ -548,14 +555,20 @@ wsReadInput(InputInfoPtr pInfo)
}
++event;
- if (dx || dy) {
- if (wsWheelEmuFilterMotion(pInfo, dx, dy))
+ if ((newdx || newdy) || ((dx || dy)
+ event-type != WSCONS_EVENT_MOUSE_DELTA_X
+ event-type != WSCONS_EVENT_MOUSE_DELTA_Y)) {
+ int tmpx = dx, tmpy = dy;
+ dx = newdx;
+ dy = newdy;
+
+ if (wsWheelEmuFilterMotion(pInfo, tmpx, tmpy))
continue;
/* relative motion event */
DBG(3, ErrorF(postMotionEvent dX %d dY %d\n,
- dx, dy));
- xf86PostMotionEvent(pInfo-dev, 0, 0, 2, dx, dy);
+ tmpx, tmpy));
+ xf86PostMotionEvent(pInfo-dev, 0, 0, 2, tmpx, tmpy);
}
if (dz priv-Z.negative != WS_NOMAP
priv-Z.positive != WS_NOMAP) {
@@ -583,9 +596,9 @@ wsReadInput(InputInfoPtr pInfo)
ay = tmp;
}
if (ax) {
- dx = ax - priv-old_ax;
+ int xdelta = ax - priv-old_ax;
priv-old_ax = ax;
- if (wsWheelEmuFilterMotion(pInfo, dx, 0))
+ if (wsWheelEmuFilterMotion(pInfo, xdelta, 0))
continue;
/* absolute position event */
@@ -593,15 +606,24 @@ wsReadInput(InputInfoPtr pInfo)
xf86PostMotionEvent(pInfo-dev, 1, 0, 1, ax);
}
if (ay) {
- dy = ay - priv-old_ay;
+ int ydelta = ay - priv-old_ay;
priv-old_ay = ay;
- if (wsWheelEmuFilterMotion(pInfo, 0, dy))
+ if (wsWheelEmuFilterMotion(pInfo, 0, ydelta))
continue;
/* absolute position event */
DBG(3,
