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dix: Reallocate touchpoint buffer at input event time [v2] 

Now that input is threaded, malloc can be used at event time to resize
the touchpoint buffer as needed.x

v2: Remove "Need to grow the queue means dropping events."
    from comment as it no longer applies. (Peter Hutterer)

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Keith Packard 2015-12-08 14:20:21 -08:00
parent e2df803fca
commit f84703b50c
1 changed files with 29 additions and 59 deletions
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88
dix/touch.c
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@ -42,9 +42,6 @@
#define TOUCH_HISTORY_SIZE 100
/* If a touch queue resize is needed, the device id's bit is set. */
static unsigned char resize_waiting[(MAXDEVICES + 7) / 8];
/**
* Some documentation about touch points:
* The driver submits touch events with it's own (unique) touch point ID.
@ -74,47 +71,27 @@ static unsigned char resize_waiting[(MAXDEVICES + 7) / 8];
* @return Always True. If we fail to grow we probably will topple over soon
* anyway and re-executing this won't help.
*/
static Bool
TouchResizeQueue(ClientPtr client, void *closure)
TouchResizeQueue(DeviceIntPtr dev)
{
int i;
DDXTouchPointInfoPtr tmp;
size_t size;
input_lock();
/* Grow sufficiently so we don't need to do it often */
size = dev->last.num_touches + dev->last.num_touches / 2 + 1;
/* first two ids are reserved */
for (i = 2; i < MAXDEVICES; i++) {
DeviceIntPtr dev;
DDXTouchPointInfoPtr tmp;
size_t size;
if (!BitIsOn(resize_waiting, i))
continue;
ClearBit(resize_waiting, i);
/* device may have disappeared by now */
dixLookupDevice(&dev, i, serverClient, DixWriteAccess);
if (!dev)
continue;
/* Need to grow the queue means dropping events. Grow sufficiently so we
* don't need to do it often */
size = dev->last.num_touches + dev->last.num_touches / 2 + 1;
tmp = reallocarray(dev->last.touches, size, sizeof(*dev->last.touches));
if (tmp) {
int j;
dev->last.touches = tmp;
for (j = dev->last.num_touches; j < size; j++)
TouchInitDDXTouchPoint(dev, &dev->last.touches[j]);
dev->last.num_touches = size;
}
tmp = reallocarray(dev->last.touches, size, sizeof(*dev->last.touches));
if (tmp) {
int j;
dev->last.touches = tmp;
for (j = dev->last.num_touches; j < size; j++)
TouchInitDDXTouchPoint(dev, &dev->last.touches[j]);
dev->last.num_touches = size;
return TRUE;
}
input_unlock();
return TRUE;
return FALSE;
}
/**
@ -172,14 +149,20 @@ TouchBeginDDXTouch(DeviceIntPtr dev, uint32_t ddx_id)
if (TouchFindByDDXID(dev, ddx_id, FALSE))
return NULL;
for (i = 0; i < dev->last.num_touches; i++) {
/* Only emulate pointer events on the first touch */
if (dev->last.touches[i].active)
emulate_pointer = FALSE;
else if (!ti) /* ti is now first non-active touch rec */
ti = &dev->last.touches[i];
for (;;) {
for (i = 0; i < dev->last.num_touches; i++) {
/* Only emulate pointer events on the first touch */
if (dev->last.touches[i].active)
emulate_pointer = FALSE;
else if (!ti) /* ti is now first non-active touch rec */
ti = &dev->last.touches[i];
if (!emulate_pointer && ti)
if (!emulate_pointer && ti)
break;
}
if (ti)
break;
if (!TouchResizeQueue(dev))
break;
}
@ -194,21 +177,8 @@ TouchBeginDDXTouch(DeviceIntPtr dev, uint32_t ddx_id)
next_client_id = 1;
ti->client_id = client_id;
ti->emulate_pointer = emulate_pointer;
return ti;
}
/* If we get here, then we've run out of touches and we need to drop the
* event (we're inside the SIGIO handler here) schedule a WorkProc to
* grow the queue for us for next time. */
ErrorFSigSafe("%s: not enough space for touch events (max %u touchpoints). "
"Dropping this event.\n", dev->name, dev->last.num_touches);
if (!BitIsOn(resize_waiting, dev->id)) {
SetBit(resize_waiting, dev->id);
QueueWorkProc(TouchResizeQueue, serverClient, NULL);
}
return NULL;
return ti;
}
void