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/*! @file buffer_allocator.h
  @brief Interface file for platform specific buffer allocator.

  @details This interface is used by SDM to allocate internal buffers.
*/

#ifndef __BUFFER_ALLOCATOR_H__
#define __BUFFER_ALLOCATOR_H__

#include <cstddef>
#include "layer_buffer.h"

namespace sdm {
/*! @brief Input configuration set by the client for buffer allocation.

  @sa BufferInfo::BufferConfig
*/

struct BufferConfig {
  uint32_t width = 0;                         //!< Specifies buffer width for buffer allocation.
  uint32_t height = 0;                        //!< Specifies buffer height for buffer allocation.
  LayerBufferFormat format = kFormatInvalid;  //!< Specifies buffer format for buffer allocation.
  uint32_t buffer_count = 0;                  //!< Specifies number of buffers to be allocated.
  bool secure = false;                        //!< Specifies buffer to be allocated from
                                              //!< secure region.
  bool cache = false;                         //!< Specifies whether the buffer needs to be cache.
  bool secure_camera = false;                 //!< Specifies buffer to be allocated from specific
                                              //!< secure heap and with a specific alignment.
  bool gfx_client = false;                    //!< Specifies whether buffer is used by gfx.
};

/*! @brief Holds the information about the allocated buffer.

  @sa BufferAllocator::AllocateBuffer
  @sa BufferAllocator::FreeBuffer
  @sa BufferAllocator::GetAllocatedBufferInfo
*/
struct AllocatedBufferInfo {
  int fd = -1;                   //!< Specifies the fd of the allocated buffer.
  uint32_t stride = 0;           //!< Specifies allocated buffer stride in bytes.
  uint32_t aligned_width = 0;    //!< Specifies aligned allocated buffer width in pixels.
  uint32_t aligned_height = 0;   //!< Specifies aligned allocated buffer height in pixels.
  LayerBufferFormat format = kFormatInvalid;  // Specifies buffer format for allocated buffer.
  uint32_t size = 0;             //!< Specifies the size of the allocated buffer.
  uint64_t id = 0;               //!< Specifies the Id of the allocated buffer.
};

/*! @brief Holds the information about the input/output configuration of an output buffer.

  @sa BufferAllocator::AllocateBuffer
  @sa BufferAllocator::FreeBuffer
*/
struct BufferInfo {
  BufferConfig buffer_config;             //!< Specifies configuration of a buffer to be allocated.
  AllocatedBufferInfo alloc_buffer_info;  //!< Specifies buffer information of allocated buffer.

  void *private_data = NULL;              //!< Pointer to private data.
};

/*! @brief Buffer allocator implemented by the client

  @details This class declares prototype for BufferAllocator methods which must be
  implemented by the client. Buffer manager in display manager will use these methods to
  allocate/deallocate buffers for display manager.

  @sa CoreInterface::CreateCore
*/
class BufferAllocator {
 public:
  /*! @brief Method to allocate ouput buffer for the given input configuration.

    @details This method allocates memory based on input configuration.

    @param[in] buffer_info \link BufferInfo \endlink

    @return \link DisplayError \endlink
  */
  virtual DisplayError AllocateBuffer(BufferInfo *buffer_info) = 0;


  /*! @brief Method to deallocate the ouput buffer.

    @details This method deallocates the memory allocated using AllocateBuffer method.

    @param[in] buffer_info \link BufferInfo \endlink

    @return \link DisplayError \endlink
  */
  virtual DisplayError FreeBuffer(BufferInfo *buffer_info) = 0;


  /*! @brief Method to get the buffer size.

    @details This method returns buffer size for a specific configuration mentioned in buffer info.

    @param[in] buffer_info \link BufferInfo \endlink

    @return \link unsigned int \endlink
  */
  virtual uint32_t GetBufferSize(BufferInfo *buffer_info) = 0;

  /*! @brief Method to Get the AllocatedBufferInfo only.

    @details This method populates the AllocatedBufferInfo as per the configuration in BufferInfo,
    but fd will be invalid.

    @param[in] buffer_info \link BufferInfo \endlink

    @param[out] allocated_buffer_info \link AllocatedBufferInfo \endlink

    @return \link DisplayError \endlink
  */
  virtual DisplayError GetAllocatedBufferInfo(const BufferConfig &buffer_config,
                                              AllocatedBufferInfo *allocated_buffer_info) = 0;

  /*
   * Retuns a buffer's layout in terms of number of planes, stride and offset of each plane
   * Input: AllocatedBufferInfo with a valid aligned width, aligned height, SDM format
   * Output: stride for each plane, offset of each plane from base, number of planes
   */
  virtual DisplayError GetBufferLayout(const AllocatedBufferInfo &buf_info,
                                       uint32_t stride[4], uint32_t offset[4],
                                       uint32_t *num_planes) {
    (void) buf_info;
    (void) stride;
    (void) offset;
    (void) num_planes;
    return kErrorNotSupported; }

 protected:
  virtual ~BufferAllocator() { }
};

}  // namespace sdm

#endif  // __BUFFER_ALLOCATOR_H__