Add support for sending VSYNC events to the framework (d0566bc2) · Commits · e / os / android_frameworks_native

include/gui/DisplayEventReceiver.h

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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.
		*/

		#ifndef ANDROID_GUI_DISPLAY_EVENT_H
		#define ANDROID_GUI_DISPLAY_EVENT_H

		#include <stdint.h>
		#include <sys/types.h>

		#include <utils/Errors.h>
		#include <utils/RefBase.h>
		#include <utils/Timers.h>

		#include <binder/IInterface.h>

		// ----------------------------------------------------------------------------

		namespace android {

		// ----------------------------------------------------------------------------

		class BitTube;
		class IDisplayEventConnection;

		// ----------------------------------------------------------------------------

		class DisplayEventReceiver {
		public:
		enum {
		DISPLAY_EVENT_VSYNC = 'vsyn'
		};

		struct Event {

		struct Header {
		uint32_t type;
		nsecs_t timestamp;
		};

		struct VSync {
		uint32_t count;
		};

		Header header;
		union {
		VSync vsync;
		};
		};

		public:
		/*
		* DisplayEventReceiver creates and registers an event connection with
		* SurfaceFlinger. Events start being delivered immediately.
		*/
		DisplayEventReceiver();

		/*
		* ~DisplayEventReceiver severs the connection with SurfaceFlinger, new events
		* stop being delivered immediately. Note that the queue could have
		* some events pending. These will be delivered.
		*/
		~DisplayEventReceiver();

		/*
		* initCheck returns the state of DisplayEventReceiver after construction.
		*/
		status_t initCheck() const;

		/*
		* getFd returns the file descriptor to use to receive events.
		* OWNERSHIP IS RETAINED by DisplayEventReceiver. DO NOT CLOSE this
		* file-descriptor.
		*/
		int getFd() const;

		/*
		* getEvents reads event from the queue and returns how many events were
		* read. Returns 0 if there are no more events or a negative error code.
		* If NOT_ENOUGH_DATA is returned, the object has become invalid forever, it
		* should be destroyed and getEvents() shouldn't be called again.
		*/
		ssize_t getEvents(Event* events, size_t count);

		private:
		sp<IDisplayEventConnection> mEventConnection;
		sp<BitTube> mDataChannel;
		};

		// ----------------------------------------------------------------------------
		}; // namespace android

		#endif // ANDROID_GUI_DISPLAY_EVENT_H

include/gui/IDisplayEventConnection.h

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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.
		*/

		#ifndef ANDROID_GUI_IDISPLAY_EVENT_CONNECTION_H
		#define ANDROID_GUI_IDISPLAY_EVENT_CONNECTION_H

		#include <stdint.h>
		#include <sys/types.h>

		#include <utils/Errors.h>
		#include <utils/RefBase.h>

		#include <binder/IInterface.h>

		namespace android {
		// ----------------------------------------------------------------------------

		class BitTube;

		class IDisplayEventConnection : public IInterface
		{
		public:
		DECLARE_META_INTERFACE(DisplayEventConnection);

		virtual sp<BitTube> getDataChannel() const = 0;
		};

		// ----------------------------------------------------------------------------

		class BnDisplayEventConnection : public BnInterface<IDisplayEventConnection>
		{
		public:
		virtual status_t onTransact( uint32_t code,
		const Parcel& data,
		Parcel* reply,
		uint32_t flags = 0);
		};

		// ----------------------------------------------------------------------------
		}; // namespace android

		#endif // ANDROID_GUI_IDISPLAY_EVENT_CONNECTION_H

include/surfaceflinger/ISurfaceComposer.h

+9 −1

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		@@ -33,8 +33,9 @@
		namespace android {
		// ----------------------------------------------------------------------------

		class IMemoryHeap;
		class ComposerState;
		class IDisplayEventConnection;
		class IMemoryHeap;

		class ISurfaceComposer : public IInterface
		{
		@@ -124,13 +125,19 @@ public:
		uint32_t reqWidth, uint32_t reqHeight,
		uint32_t minLayerZ, uint32_t maxLayerZ) = 0;

		/* triggers screen off animation */
		virtual status_t turnElectronBeamOff(int32_t mode) = 0;

		/* triggers screen on animation */
		virtual status_t turnElectronBeamOn(int32_t mode) = 0;

		/* verify that an ISurfaceTexture was created by SurfaceFlinger.
		*/
		virtual bool authenticateSurfaceTexture(
		const sp<ISurfaceTexture>& surface) const = 0;

		/* return an IDisplayEventConnection */
		virtual sp<IDisplayEventConnection> createDisplayEventConnection() = 0;
		};

		// ----------------------------------------------------------------------------
		@@ -151,6 +158,7 @@ public:
		TURN_ELECTRON_BEAM_OFF,
		TURN_ELECTRON_BEAM_ON,
		AUTHENTICATE_SURFACE,
		CREATE_DISPLAY_EVENT_CONNECTION,
		};

		virtual status_t onTransact( uint32_t code,

libs/gui/Android.mk

+2 −0

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		@@ -3,6 +3,8 @@ include $(CLEAR_VARS)

		LOCAL_SRC_FILES:= \
		BitTube.cpp \
		DisplayEventReceiver.cpp \
		IDisplayEventConnection.cpp \
		ISensorEventConnection.cpp \
		ISensorServer.cpp \
		ISurfaceTexture.cpp \

libs/gui/DisplayEventReceiver.cpp

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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