| /* |
| * 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 */ |