bool NativeDisplayEventReceiver::processPendingEvents(
nsecs_t* outTimestamp, int32_t* outId, uint32_t* outCount) {
bool gotVsync = false;
DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
ssize_t n;
while ((n = mReceiver.getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
ALOGV("receiver %p ~ Read %d events.", this, int(n));
for (ssize_t i = 0; i < n; i++) {
const DisplayEventReceiver::Event& ev = buf[i];
switch (ev.header.type) {
case DisplayEventReceiver::DISPLAY_EVENT_VSYNC:
// Later vsync events will just overwrite the info from earlier
// ones. That's fine, we only care about the most recent.
gotVsync = true;
*outTimestamp = ev.header.timestamp;
*outId = ev.header.id;
*outCount = ev.vsync.count;
break;
case DisplayEventReceiver::DISPLAY_EVENT_HOTPLUG:
dispatchHotplug(ev.header.timestamp, ev.header.id, ev.hotplug.connected);
break;
default:
ALOGW("receiver %p ~ ignoring unknown event type %#x", this, ev.header.type);
break;
}
}
}
if (n < 0) {
ALOGW("Failed to get events from display event receiver, status=%d", status_t(n));
}
return gotVsync;
}
bool NativeDisplayEventReceiver::readLastVsyncMessage(
nsecs_t* outTimestamp, int32_t* outId, uint32_t* outCount)
{
android::DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
ssize_t n;
while ((n = mReceiver.getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
ALOGV("receiver %p ~ Read %d events.", this, int(n));
while (n-- > 0) {
const android::DisplayEventReceiver::Event& ev = buf[n];
if (ev.header.type == android::DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
*outTimestamp = ev.header.timestamp;
*outId = ev.header.id;
*outCount = ev.vsync.count;
return true; // stop at last vsync in the buffer
}
if (ev.header.type == android::DisplayEventReceiver::DISPLAY_EVENT_HOTPLUG) {
dispatchHotplug(ev.header.timestamp, ev.header.id, ev.hotplug.connected);
}
}
}
if (n < 0) {
ALOGW("Failed to get events from display event receiver, status=%d", android::status_t(n));
}
return false;
}
