diff options
author | Peter Hutterer <peter.hutterer@who-t.net> | 2011-12-14 15:56:05 +1000 |
---|---|---|
committer | Chase Douglas <chase.douglas@canonical.com> | 2011-12-21 10:34:11 -0800 |
commit | d877022c852976c8b0b072d8388ede068bd31998 (patch) | |
tree | 7ee347cdf8c3d09d87079a306c77404599d28a09 | |
parent | 27e63ca898dc91a96c9fa1ecf976e648a74cb3f2 (diff) |
dix: add touch event history helper functions
If touch client has not registered for ownership events and a grab above
that client is rejected, the client needs to receive the complete event
history.
The history currently doesn't really do fancy overflow handling. We assume
that the first TOUCH_HISTORY_SIZE events are the important ones and anything
after that is dropped. If that is a problem, fix the client that takes > 100
event to decide whether to accept or reject.
Events marked with TOUCH_CLIENT_ID or TOUCH_REPLAYING must not be stored in
the history, they are events created by the DIX to comply with the protocol.
Any such event should already be in the history anyway.
A fixme in this patch: we don't have a function to actually deliver the
event yet.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Chase Douglas <chase.douglas@canonical.com>
-rw-r--r-- | dix/touch.c | 109 | ||||
-rw-r--r-- | include/input.h | 4 |
2 files changed, 113 insertions, 0 deletions
diff --git a/dix/touch.c b/dix/touch.c index dfb7ff041..792ebcdd7 100644 --- a/dix/touch.c +++ b/dix/touch.c @@ -35,6 +35,9 @@ #include "eventstr.h" #include "exevents.h" +#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]; @@ -394,6 +397,112 @@ TouchEndTouch(DeviceIntPtr dev, TouchPointInfoPtr ti) ti->num_grabs = 0; ti->client_id = 0; + TouchEventHistoryFree(ti); + valuator_mask_zero(ti->valuators); } +/** + * Allocate the event history for this touch pointer. Calling this on a + * touchpoint that already has an event history does nothing but counts as + * as success. + * + * @return TRUE on success, FALSE on allocation errors + */ +Bool +TouchEventHistoryAllocate(TouchPointInfoPtr ti) +{ + if (ti->history) + return TRUE; + + ti->history = calloc(TOUCH_HISTORY_SIZE, sizeof(*ti->history)); + ti->history_elements = 0; + if (ti->history) + ti->history_size = TOUCH_HISTORY_SIZE; + return ti->history != NULL; +} + +void +TouchEventHistoryFree(TouchPointInfoPtr ti) +{ + free(ti->history); + ti->history = NULL; + ti->history_size = 0; + ti->history_elements = 0; +} + +/** + * Store the given event on the event history (if one exists) + * A touch event history consists of one TouchBegin and several TouchUpdate + * events (if applicable) but no TouchEnd event. + * If more than one TouchBegin is pushed onto the stack, the push is + * ignored, calling this function multiple times for the TouchBegin is + * valid. + */ +void +TouchEventHistoryPush(TouchPointInfoPtr ti, const DeviceEvent *ev) +{ + if (!ti->history) + return; + + switch(ev->type) + { + case ET_TouchBegin: + /* don't store the same touchbegin twice */ + if (ti->history_elements > 0) + return; + break; + case ET_TouchUpdate: + break; + case ET_TouchEnd: + return; /* no TouchEnd events in the history */ + default: + return; + } + + /* We only store real events in the history */ + if (ev->flags & (TOUCH_CLIENT_ID|TOUCH_REPLAYING)) + return; + + ti->history[ti->history_elements++] = *ev; + /* FIXME: proper overflow fixes */ + if (ti->history_elements > ti->history_size - 1) + { + ti->history_elements = ti->history_size - 1; + DebugF("source device %d: history size %d overflowing for touch %u\n", + ti->sourceid, ti->history_size, ti->client_id); + } +} + +void +TouchEventHistoryReplay(TouchPointInfoPtr ti, DeviceIntPtr dev, XID resource) +{ + InternalEvent *tel = InitEventList(GetMaximumEventsNum()); + ValuatorMask *mask = valuator_mask_new(0); + int i, nev; + int flags; + + if (!ti->history) + return; + + valuator_mask_set_double(mask, 0, ti->history[0].valuators.data[0]); + valuator_mask_set_double(mask, 1, ti->history[0].valuators.data[1]); + + flags = TOUCH_CLIENT_ID|TOUCH_REPLAYING; + if (ti->emulate_pointer) + flags |= TOUCH_POINTER_EMULATED; + /* send fake begin event to next owner */ + nev = GetTouchEvents(tel, dev, ti->client_id, XI_TouchBegin, flags, mask); + /* FIXME: deliver the event */ + + valuator_mask_free(&mask); + FreeEventList(tel, GetMaximumEventsNum()); + + /* First event was TouchBegin, already replayed that one */ + for (i = 1; i < ti->history_elements; i++) + { + DeviceEvent *ev = &ti->history[i]; + ev->flags |= TOUCH_REPLAYING; + /* FIXME: deliver the event */ + } +} diff --git a/include/input.h b/include/input.h index 4d60792cd..8ce5f2b9d 100644 --- a/include/input.h +++ b/include/input.h @@ -607,6 +607,10 @@ extern TouchPointInfoPtr TouchBeginTouch(DeviceIntPtr dev, int sourceid, extern TouchPointInfoPtr TouchFindByClientID(DeviceIntPtr dev, uint32_t client_id); extern void TouchEndTouch(DeviceIntPtr dev, TouchPointInfoPtr ti); +extern Bool TouchEventHistoryAllocate(TouchPointInfoPtr ti); +extern void TouchEventHistoryFree(TouchPointInfoPtr ti); +extern void TouchEventHistoryPush(TouchPointInfoPtr ti, const DeviceEvent *ev); +extern void TouchEventHistoryReplay(TouchPointInfoPtr ti, DeviceIntPtr dev, XID resource); /* misc event helpers */ extern Mask GetEventMask(DeviceIntPtr dev, xEvent* ev, InputClientsPtr clients); |