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/*
* Copyright (C) 2009 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.
*/
#ifndef ANDROID_MESSAGE_QUEUE_H
#define ANDROID_MESSAGE_QUEUE_H
#include <stdint.h>
#include <errno.h>
#include <sys/types.h>
#include <utils/threads.h>
#include <utils/Timers.h>
#include <utils/Looper.h>
#include <private/gui/BitTube.h>
#include <gui/DisplayEventReceiver.h>
#include "Barrier.h"
#include <functional>
namespace android {
class IDisplayEventConnection;
class EventThread;
class SurfaceFlinger;
// ---------------------------------------------------------------------------
class MessageBase : public MessageHandler
{
public:
MessageBase();
// return true if message has a handler
virtual bool handler() = 0;
// waits for the handler to be processed
void wait() const { barrier.wait(); }
protected:
virtual ~MessageBase();
private:
virtual void handleMessage(const Message& message);
mutable Barrier barrier;
};
class LambdaMessage : public MessageBase {
public:
explicit LambdaMessage(std::function<void()> handler)
: MessageBase(), mHandler(std::move(handler)) {}
bool handler() override {
mHandler();
// This return value is no longer checked, so it's always safe to return true
return true;
}
private:
const std::function<void()> mHandler;
};
// ---------------------------------------------------------------------------
class MessageQueue {
class Handler : public MessageHandler {
enum {
eventMaskInvalidate = 0x1,
eventMaskRefresh = 0x2,
eventMaskTransaction = 0x4
};
MessageQueue& mQueue;
int32_t mEventMask;
public:
explicit Handler(MessageQueue& queue) : mQueue(queue), mEventMask(0) { }
virtual void handleMessage(const Message& message);
void dispatchRefresh();
void dispatchInvalidate();
};
friend class Handler;
sp<SurfaceFlinger> mFlinger;
sp<Looper> mLooper;
sp<EventThread> mEventThread;
sp<IDisplayEventConnection> mEvents;
gui::BitTube mEventTube;
sp<Handler> mHandler;
static int cb_eventReceiver(int fd, int events, void* data);
int eventReceiver(int fd, int events);
public:
enum {
INVALIDATE = 0,
REFRESH = 1,
};
MessageQueue();
~MessageQueue();
void init(const sp<SurfaceFlinger>& flinger);
void setEventThread(const sp<EventThread>& events);
void waitMessage();
status_t postMessage(const sp<MessageBase>& message, nsecs_t reltime=0);
// sends INVALIDATE message at next VSYNC
void invalidate();
// sends REFRESH message at next VSYNC
void refresh();
};
// ---------------------------------------------------------------------------
}; // namespace android
#endif /* ANDROID_MESSAGE_QUEUE_H */
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