ra8_rabook_gray4.h

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#pragma once
 
#include <stdint.h>
 
#include "ra8_err.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* -------------------------------------------------------------------------- */
/* Public constants */
/* -------------------------------------------------------------------------- */

typedef enum : uint16_t {
  k_ra8_rabook_gray4_gray_levels  = 16U, 
  k_ra8_rabook_gray4_quant_div    = 17U, 
  k_ra8_rabook_gray4_round_half   = 8U,  
  k_ra8_rabook_gray4_nib_max      = 15U, 
  k_ra8_rabook_gray4_nib_per_byte = 2U,  
} ra8_rabook_gray4_consts_t;
 
/* -------------------------------------------------------------------------- */
/* API */
/* -------------------------------------------------------------------------- */

void ra8_rabook_gray4_output_dims(uint16_t  src_w,
                                  uint16_t  src_h,
                                  uint16_t  max_edge,
                                  uint16_t* out_w,
                                  uint16_t* out_h);

ra8_err_t ra8_rabook_gray4_downscale(const uint8_t* src,
                                     uint16_t       src_w,
                                     uint16_t       src_h,
                                     uint8_t*       dst,
                                     uint16_t       dst_w,
                                     uint16_t       dst_h);

ra8_err_t ra8_rabook_gray4_encode(const uint8_t* gray_pixels,
                                  uint16_t       w,
                                  uint16_t       h,
                                  uint8_t*       out,
                                  uint32_t       out_cap,
                                  uint32_t*      out_size);

ra8_err_t ra8_rabook_gray8_encode(const uint8_t* gray_pixels,
                                  uint16_t       w,
                                  uint16_t       h,
                                  uint8_t*       out,
                                  uint32_t       out_cap,
                                  uint32_t*      out_size);
 
#ifdef __cplusplus
} /* extern "C" */
#endif