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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <string.h>
#include <utils/Errors.h>
#include <gui/BitTube.h>
#include <gui/DisplayEventReceiver.h>
#include <gui/IDisplayEventConnection.h>
#include <private/gui/ComposerService.h>
#include <surfaceflinger/ISurfaceComposer.h>
// ---------------------------------------------------------------------------
namespace android {
// ---------------------------------------------------------------------------
DisplayEventReceiver::DisplayEventReceiver() {
sp<ISurfaceComposer> sf(ComposerService::getComposerService());
if (sf != NULL) {
mEventConnection = sf->createDisplayEventConnection();
if (mEventConnection != NULL) {
mDataChannel = mEventConnection->getDataChannel();
}
}
}
DisplayEventReceiver::~DisplayEventReceiver() {
}
status_t DisplayEventReceiver::initCheck() const {
if (mDataChannel != NULL)
return NO_ERROR;
return NO_INIT;
}
int DisplayEventReceiver::getFd() const {
if (mDataChannel == NULL)
return NO_INIT;
return mDataChannel->getFd();
}
ssize_t DisplayEventReceiver::getEvents(DisplayEventReceiver::Event* events,
size_t count) {
ssize_t size = mDataChannel->read(events, sizeof(events[0])*count);
LOGE_IF(size<0,
"DisplayEventReceiver::getEvents error (%s)",
strerror(-size));
if (size >= 0) {
// Note: if (size % sizeof(events[0])) != 0, we've got a
// partial read. This can happen if the queue filed up (ie: if we
// didn't pull from it fast enough).
// We discard the partial event and rely on the sender to
// re-send the event if appropriate (some events, like VSYNC
// can be lost forever).
// returns number of events read
size /= sizeof(events[0]);
}
return size;
}
// ---------------------------------------------------------------------------
}; // namespace android
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