/*
 * The Npic library
 *
 * Copyright (C) 2003 Edouard Thiel <Edouard.Thiel@lif.univ-mrs.fr>
 *
 * This library is free software under the terms of the 
 * GNU Lesser General Public License (LGPL) version 2.1.
*/

/*
 * pixels.h - 31/12/2003
 *
 * pixel types
*/


#ifndef NPIC__PIXELS_H
#define NPIC__PIXELS_H


/* Check if char is 8-bit, short is 16-bit and long is 32-bit,
   or find equivalent types, using macros defined in limits.h */
   
#if UCHAR_MAX == 255
  typedef signed   char   Npic_sint8;  
  typedef unsigned char   Npic_uint8;
#else
  #error char is not 8-bit in this environment
#endif

#if USHRT_MAX == 65535
  typedef signed   short  Npic_sint16; 
  typedef unsigned short  Npic_uint16; 
#else
  #error short is not 16-bit in this environment
#endif

#if ULONG_MAX == 4294967295UL
  typedef signed   long   Npic_sint32; 
  typedef unsigned long   Npic_uint32; 
# define NPIC_PL "ld"
#elif UINT_MAX == 4294967295U
  typedef signed   int    Npic_sint32; 
  typedef unsigned int    Npic_uint32; 
# define NPIC_PL "d"
#else
  #error long is not 32-bit in this environment
#endif

/* From bits/byteswap.h */
#define NPIC_BSWAP16(x) \
     ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))

#define NPIC_BSWAP32(x) \
     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \
      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))

#define NPIC_BSWAP64(x) \
     ((((x) & 0xff00000000000000ull) >> 56) | \
      (((x) & 0x00ff000000000000ull) >> 40) | \
      (((x) & 0x0000ff0000000000ull) >> 24) | \
      (((x) & 0x000000ff00000000ull) >> 8)  | \
      (((x) & 0x00000000ff000000ull) << 8)  | \
      (((x) & 0x0000000000ff0000ull) << 24) | \
      (((x) & 0x000000000000ff00ull) << 40) | \
      (((x) & 0x00000000000000ffull) << 56))

/* 
 * Pixel type definitions 
*/

typedef Npic_uint8   Npic_c;     /* char */
typedef Npic_sint16  Npic_s;     /* short */
typedef Npic_sint32  Npic_l;     /* long */
typedef double       Npic_d;     /* floating number */

/* Quadri and alternatives */
typedef struct { Npic_uint16 a, b, c, d ; } Npic_q;
typedef struct { Npic_uint16 r, g, b, a ; } Npic_rgba;
typedef struct { Npic_uint16 c, m, y, k ; } Npic_cmyk;
typedef struct { Npic_uint16 h, s, v, a ; } Npic_hsva;

/* Pixel nature */
enum {
    NPIC_NONE = 0X4251,
    NPIC_C,
    NPIC_L,
    NPIC_D,
    NPIC_Q
};


/* For backward compatibility >= 0.21 */
#define NPIC_PRINTF_L NPIC_PL


#endif /* NPIC__PIXELS_H */