merrifield/include/BufferManager.h

/*
// Copyright (c) 2014 Intel Corporation 
//
// 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 BUFFERMANAGER_H_
#define BUFFERMANAGER_H_

#include <Dump.h>
#include <DataBuffer.h>
#include <BufferMapper.h>
#include <BufferCache.h>
#include <utils/Mutex.h>

namespace android {
namespace intel {

// Gralloc Buffer Manager
class BufferManager {
public:
    BufferManager();
    virtual ~BufferManager();

    bool initCheck() const;
    virtual bool initialize();
    virtual void deinitialize();

    // dump interface
    void dump(Dump& d);

    // lockDataBuffer and unlockDataBuffer must be used in serial
    // nested calling of them will cause a deadlock
    DataBuffer* lockDataBuffer(buffer_handle_t handle);
    void unlockDataBuffer(DataBuffer *buffer);

    // get and put interfaces are deprecated
    // use lockDataBuffer and unlockDataBuffer instead
    DataBuffer* get(buffer_handle_t handle);
    void put(DataBuffer *buffer);

    // map/unmap a data buffer into/from display memory
    BufferMapper* map(DataBuffer& buffer);
    void unmap(BufferMapper *mapper);

    // frame buffer management
    //return 0 if allocation fails
    virtual buffer_handle_t allocFrameBuffer(int width, int height, int *stride);
    virtual void freeFrameBuffer(buffer_handle_t fbHandle);

    buffer_handle_t allocGrallocBuffer(uint32_t width, uint32_t height, uint32_t format, uint32_t usage);
    void freeGrallocBuffer(buffer_handle_t handle);
    virtual bool blit(buffer_handle_t srcHandle, buffer_handle_t destHandle,
                      const crop_t& destRect, bool filter, bool async) = 0;
protected:
    virtual DataBuffer* createDataBuffer(buffer_handle_t handle) = 0;
    virtual BufferMapper* createBufferMapper(DataBuffer& buffer) = 0;

    const hw_device_t* mGralloc;
private:
    enum {
        // make the buffer pool large enough
        DEFAULT_BUFFER_POOL_SIZE = 128,
    };

    KeyedVector<buffer_handle_t, BufferMapper*> mFrameBuffers;
    BufferCache *mBufferPool;
    DataBuffer *mDataBuffer;
    Mutex mDataBufferLock;
    Mutex mLock;
    bool mInitialized;
};

} // namespace intel
} // namespace android

#endif /* BUFFERMANAGER_H_ */