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/* pgm.h - header file for libpgm portable graymap library */ #ifndef _PGM_H_ #define _PGM_H_ #include "pbm.h" #ifdef PGM_BIGGRAYS typedef unsigned short gray; #define PGM_MAXMAXVAL 65535 #else /*PGM_BIGGRAYS*/ typedef unsigned char gray; #define PGM_MAXMAXVAL 255 #endif /*PGM_BIGGRAYS*/ /* Magic constants. */ #define PGM_MAGIC1 'P' #define PGM_MAGIC2 '2' #define RPGM_MAGIC2 '5' #define PGM_FORMAT (PGM_MAGIC1 * 256 + PGM_MAGIC2) #define RPGM_FORMAT (PGM_MAGIC1 * 256 + RPGM_MAGIC2) #define PGM_TYPE PGM_FORMAT /* Macro for turning a format number into a type number. */ #define PGM_FORMAT_TYPE(f) ((f) == PGM_FORMAT || (f) == RPGM_FORMAT ? PGM_TYPE : PBM_FORMAT_TYPE(f)) /* Declarations of routines. */ void pgm_init ARGS(( int* argcP, char* argv[] )); #define pgm_allocarray( cols, rows ) ((gray**) pm_allocarray( cols, rows, sizeof(gray) )) #define pgm_allocrow( cols ) ((gray*) pm_allocrow( cols, sizeof(gray) )) #define pgm_freearray( grays, rows ) pm_freearray( (char**) grays, rows ) #define pgm_freerow( grayrow ) pm_freerow( (char*) grayrow ) gray** pgm_readpgm ARGS(( FILE* file, int* colsP, int* rowsP, gray* maxvalP )); void pgm_readpgminit ARGS(( FILE* file, int* colsP, int* rowsP, gray* maxvalP, int* formatP )); void pgm_readpgmrow ARGS(( FILE* file, gray* grayrow, int cols, gray maxval, int format )); void pgm_writepgm ARGS(( FILE* file, gray** grays, int cols, int rows, gray maxval, int forceplain )); void pgm_writepgminit ARGS(( FILE* file, int cols, int rows, gray maxval, int forceplain )); void pgm_writepgmrow ARGS(( FILE* file, gray* grayrow, int cols, gray maxval, int forceplain )); extern gray pgm_pbmmaxval; /* This is the maxval used when a PGM program reads a PBM file. Normally ** it is 1; however, for some programs, a larger value gives better results */ #endif /*_PGM_H_*/
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