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137 lines
3.9 KiB
137 lines
3.9 KiB
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_GUI_DISPLAY_EVENT_H
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#define ANDROID_GUI_DISPLAY_EVENT_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Errors.h>
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#include <utils/RefBase.h>
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#include <utils/Timers.h>
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#include <binder/IInterface.h>
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// ----------------------------------------------------------------------------
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namespace android {
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// ----------------------------------------------------------------------------
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class BitTube;
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class IDisplayEventConnection;
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// ----------------------------------------------------------------------------
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class DisplayEventReceiver {
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public:
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enum {
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DISPLAY_EVENT_VSYNC = 'vsyn',
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DISPLAY_EVENT_HOTPLUG = 'plug'
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};
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struct Event {
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struct Header {
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uint32_t type;
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uint32_t id;
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nsecs_t timestamp __attribute__((aligned(8)));
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};
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struct VSync {
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uint32_t count;
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};
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struct Hotplug {
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bool connected;
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};
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Header header;
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union {
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VSync vsync;
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Hotplug hotplug;
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};
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};
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public:
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/*
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* DisplayEventReceiver creates and registers an event connection with
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* SurfaceFlinger. VSync events are disabled by default. Call setVSyncRate
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* or requestNextVsync to receive them.
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* Other events start being delivered immediately.
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*/
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DisplayEventReceiver();
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/*
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* ~DisplayEventReceiver severs the connection with SurfaceFlinger, new events
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* stop being delivered immediately. Note that the queue could have
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* some events pending. These will be delivered.
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*/
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~DisplayEventReceiver();
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/*
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* initCheck returns the state of DisplayEventReceiver after construction.
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*/
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status_t initCheck() const;
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/*
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* getFd returns the file descriptor to use to receive events.
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* OWNERSHIP IS RETAINED by DisplayEventReceiver. DO NOT CLOSE this
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* file-descriptor.
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*/
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int getFd() const;
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/*
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* getEvents reads events from the queue and returns how many events were
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* read. Returns 0 if there are no more events or a negative error code.
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* If NOT_ENOUGH_DATA is returned, the object has become invalid forever, it
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* should be destroyed and getEvents() shouldn't be called again.
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*/
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ssize_t getEvents(Event* events, size_t count);
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static ssize_t getEvents(const sp<BitTube>& dataChannel,
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Event* events, size_t count);
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/*
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* sendEvents write events to the queue and returns how many events were
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* written.
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*/
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static ssize_t sendEvents(const sp<BitTube>& dataChannel,
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Event const* events, size_t count);
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/*
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* setVsyncRate() sets the Event::VSync delivery rate. A value of
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* 1 returns every Event::VSync. A value of 2 returns every other event,
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* etc... a value of 0 returns no event unless requestNextVsync() has
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* been called.
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*/
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status_t setVsyncRate(uint32_t count);
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/*
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* requestNextVsync() schedules the next Event::VSync. It has no effect
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* if the vsync rate is > 0.
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*/
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status_t requestNextVsync();
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private:
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sp<IDisplayEventConnection> mEventConnection;
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sp<BitTube> mDataChannel;
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};
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_GUI_DISPLAY_EVENT_H
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