/*** HDP.H : Encoding and Decoding of High Dynamic Range Pixels*//*** Encoding and Decoding Types*/typedef unsigned char byte;typedef float real; /* change to "double" if you work with double precision */typedef byte bytecolor[3];typedef real realcolor[3];/*** Encoding and Decoding Tables*/extern byte *EncodeLut;extern real *DecodeLut;extern real  LutScale;/*** Encoding and Decoding Functions*/extern int init_HDP_encode (real,real,int);extern int init_HDP_decode (real,real,real);extern void exit_HDP_encode (void);extern void exit_HDP_decode (void);/*** Encoding and Decoding Macros*/#define HDP_ENCODE(RealColor,ByteColor) ( \   ByteColor[0] = EncodeLut [(int) (RealColor[0] * LutScale + 0.5)], \   ByteColor[1] = EncodeLut [(int) (RealColor[1] * LutScale + 0.5)], \   ByteColor[2] = EncodeLut [(int) (RealColor[2] * LutScale + 0.5)])#define HDP_DECODE(ByteColor,RealColor) ( \   RealColor[0] = DecodeLut [ByteColor[0]], \   RealColor[1] = DecodeLut [ByteColor[1]], \   RealColor[2] = DecodeLut [ByteColor[2]])