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/*
* Copyright (C) 2013 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_ICONSUMERLISTENER_H
#define ANDROID_GUI_ICONSUMERLISTENER_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
#include <binder/IInterface.h>
namespace android {
// ----------------------------------------------------------------------------
class BufferItem;
// ConsumerListener is the interface through which the BufferQueue notifies
// the consumer of events that the consumer may wish to react to. Because
// the consumer will generally have a mutex that is locked during calls from
// the consumer to the BufferQueue, these calls from the BufferQueue to the
// consumer *MUST* be called only when the BufferQueue mutex is NOT locked.
class ConsumerListener : public virtual RefBase {
public:
ConsumerListener() { }
virtual ~ConsumerListener() { }
// onFrameAvailable is called from queueBuffer each time an additional
// frame becomes available for consumption. This means that frames that
// are queued while in asynchronous mode only trigger the callback if no
// previous frames are pending. Frames queued while in synchronous mode
// always trigger the callback. The item passed to the callback will contain
// all of the information about the queued frame except for its
// GraphicBuffer pointer, which will always be null.
//
// This is called without any lock held and can be called concurrently
// by multiple threads.
virtual void onFrameAvailable(const BufferItem& item) = 0; /* Asynchronous */
// onFrameReplaced is called from queueBuffer if the frame being queued is
// replacing an existing slot in the queue. Any call to queueBuffer that
// doesn't call onFrameAvailable will call this callback instead. The item
// passed to the callback will contain all of the information about the
// queued frame except for its GraphicBuffer pointer, which will always be
// null.
//
// This is called without any lock held and can be called concurrently
// by multiple threads.
virtual void onFrameReplaced(const BufferItem& /* item */) {} /* Asynchronous */
// onBuffersReleased is called to notify the buffer consumer that the
// BufferQueue has released its references to one or more GraphicBuffers
// contained in its slots. The buffer consumer should then call
// BufferQueue::getReleasedBuffers to retrieve the list of buffers
//
// This is called without any lock held and can be called concurrently
// by multiple threads.
virtual void onBuffersReleased() = 0; /* Asynchronous */
// onSidebandStreamChanged is called to notify the buffer consumer that the
// BufferQueue's sideband buffer stream has changed. This is called when a
// stream is first attached and when it is either detached or replaced by a
// different stream.
virtual void onSidebandStreamChanged() = 0; /* Asynchronous */
};
class IConsumerListener : public ConsumerListener, public IInterface
{
public:
DECLARE_META_INTERFACE(ConsumerListener);
};
// ----------------------------------------------------------------------------
class BnConsumerListener : public BnInterface<IConsumerListener>
{
public:
virtual status_t onTransact( uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags = 0);
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_GUI_ICONSUMERLISTENER_H
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