/* Lock the event queue, take a peep at it, and unlock it */
int
SDL_PeepEvents(SDL_Event * events, int numevents, SDL_eventaction action,
Uint32 minType, Uint32 maxType)
{
int i, used;
/* Don't look after we've quit */
if (!SDL_EventQ.active) {
return (-1);
}
/* Lock the event queue */
used = 0;
if (SDL_mutexP(SDL_EventQ.lock) == 0) {
if (action == SDL_ADDEVENT) {
for (i = 0; i < numevents; ++i) {
used += SDL_AddEvent(&events[i]);
}
} else {
SDL_Event tmpevent;
int spot;
/* If 'events' is NULL, just see if they exist */
if (events == NULL) {
action = SDL_PEEKEVENT;
numevents = 1;
events = &tmpevent;
}
spot = SDL_EventQ.head;
while ((used < numevents) && (spot != SDL_EventQ.tail)) {
Uint32 type = SDL_EventQ.event[spot].type;
if (minType <= type && type <= maxType) {
events[used++] = SDL_EventQ.event[spot];
if (action == SDL_GETEVENT) {
spot = SDL_CutEvent(spot);
} else {
spot = (spot + 1) % MAXEVENTS;
}
} else {
spot = (spot + 1) % MAXEVENTS;
}
}
}
SDL_mutexV(SDL_EventQ.lock);
} else {
SDL_SetError("Couldn't lock event queue");
used = -1;
}
return (used);
}
int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action,
Uint32 mask)
{
int i, used;
if ( ! SDL_EventQ.active ) {
return(-1);
}
used = 0;
if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) {
if ( action == SDL_ADDEVENT ) {
for ( i=0; i<numevents; ++i ) {
used += SDL_AddEvent(&events[i]);
}
} else {
SDL_Event tmpevent;
int spot;
if ( events == NULL ) {
action = SDL_PEEKEVENT;
numevents = 1;
events = &tmpevent;
}
spot = SDL_EventQ.head;
while ((used < numevents)&&(spot != SDL_EventQ.tail)) {
if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) {
events[used++] = SDL_EventQ.event[spot];
if ( action == SDL_GETEVENT ) {
spot = SDL_CutEvent(spot);
} else {
spot = (spot+1)%MAXEVENTS;
}
} else {
spot = (spot+1)%MAXEVENTS;
}
}
}
SDL_mutexV(SDL_EventQ.lock);
} else {
SDL_SetError("Couldn't lock event queue");
used = -1;
}
return(used);
}
void
SDL_FilterEvents(SDL_EventFilter filter, void *userdata)
{
if (SDL_mutexP(SDL_EventQ.lock) == 0) {
int spot;
spot = SDL_EventQ.head;
while (spot != SDL_EventQ.tail) {
if (filter(userdata, &SDL_EventQ.event[spot])) {
spot = (spot + 1) % MAXEVENTS;
} else {
spot = SDL_CutEvent(spot);
}
}
}
SDL_mutexV(SDL_EventQ.lock);
}
