1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_MESSAGE_QUEUE_H 18 #define ANDROID_MESSAGE_QUEUE_H 19 20 #include <errno.h> 21 #include <stdint.h> 22 #include <sys/types.h> 23 24 #include <utils/Looper.h> 25 #include <utils/Timers.h> 26 #include <utils/threads.h> 27 28 #include <gui/IDisplayEventConnection.h> 29 #include <private/gui/BitTube.h> 30 31 #include "Barrier.h" 32 33 #include <functional> 34 35 namespace android { 36 37 class EventThread; 38 class SurfaceFlinger; 39 40 // --------------------------------------------------------------------------- 41 42 class MessageBase : public MessageHandler { 43 public: 44 MessageBase(); 45 46 // return true if message has a handler 47 virtual bool handler() = 0; 48 49 // waits for the handler to be processed 50 void wait() const { barrier.wait(); } 51 52 protected: 53 virtual ~MessageBase(); 54 55 private: 56 virtual void handleMessage(const Message& message); 57 58 mutable Barrier barrier; 59 }; 60 61 class LambdaMessage : public MessageBase { 62 public: 63 explicit LambdaMessage(std::function<void()> handler) 64 : MessageBase(), mHandler(std::move(handler)) {} 65 66 bool handler() override { 67 mHandler(); 68 // This return value is no longer checked, so it's always safe to return true 69 return true; 70 } 71 72 private: 73 const std::function<void()> mHandler; 74 }; 75 76 // --------------------------------------------------------------------------- 77 78 class MessageQueue { 79 public: 80 enum { 81 INVALIDATE = 0, 82 REFRESH = 1, 83 }; 84 85 virtual ~MessageQueue(); 86 87 virtual void init(const sp<SurfaceFlinger>& flinger) = 0; 88 virtual void setEventThread(EventThread* events) = 0; 89 virtual void waitMessage() = 0; 90 virtual status_t postMessage(const sp<MessageBase>& message, nsecs_t reltime = 0) = 0; 91 virtual void invalidate() = 0; 92 virtual void refresh() = 0; 93 }; 94 95 // --------------------------------------------------------------------------- 96 97 namespace impl { 98 99 class MessageQueue final : public android::MessageQueue { 100 class Handler : public MessageHandler { 101 enum { eventMaskInvalidate = 0x1, eventMaskRefresh = 0x2, eventMaskTransaction = 0x4 }; 102 MessageQueue& mQueue; 103 int32_t mEventMask; 104 105 public: 106 explicit Handler(MessageQueue& queue) : mQueue(queue), mEventMask(0) {} 107 virtual void handleMessage(const Message& message); 108 void dispatchRefresh(); 109 void dispatchInvalidate(); 110 }; 111 112 friend class Handler; 113 114 sp<SurfaceFlinger> mFlinger; 115 sp<Looper> mLooper; 116 android::EventThread* mEventThread; 117 sp<IDisplayEventConnection> mEvents; 118 gui::BitTube mEventTube; 119 sp<Handler> mHandler; 120 121 static int cb_eventReceiver(int fd, int events, void* data); 122 int eventReceiver(int fd, int events); 123 124 public: 125 ~MessageQueue() override = default; 126 void init(const sp<SurfaceFlinger>& flinger) override; 127 void setEventThread(android::EventThread* events) override; 128 129 void waitMessage() override; 130 status_t postMessage(const sp<MessageBase>& message, nsecs_t reltime = 0) override; 131 132 // sends INVALIDATE message at next VSYNC 133 void invalidate() override; 134 // sends REFRESH message at next VSYNC 135 void refresh() override; 136 }; 137 138 // --------------------------------------------------------------------------- 139 140 } // namespace impl 141 } // namespace android 142 143 #endif /* ANDROID_MESSAGE_QUEUE_H */ 144
