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- libpgm(3) AMIGA libpgm(3)
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- NAME
- libpgm - functions to support portable graymap programs
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- SYNOPSIS
- #include <pgm.h>
- cc ... libpgm.a libpbm.a
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- DESCRIPTION
- TYPES AND CONSTANTS
- typedef ... gray;
- #define PGM_MAXMAXVAL ...
- extern gray pgm_pbmmaxval;
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- Each gray should contain only the values between 0 and
- PGM_MAXMAXVAL. pgm_pbmmaxval 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.
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- #define PGM_FORMAT ...
- #define RPGM_FORMAT ...
- #define PGM_TYPE PGM_FORMAT
- int PGM_FORMAT_TYPE( int format )
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- For distinguishing different file formats and types.
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- INITIALIZATION
- void pgm_init( int* argcP, char* argv[] )
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- All PGM programs must call this routine.
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- MEMORY MANAGEMENT
- gray** pgm_allocarray( int cols, int rows )
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- Allocate an array of grays.
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- gray* pgm_allocrow( int cols )
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- Allocate a row of the given number of grays.
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- void pgm_freearray( gray** grays, int rows )
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- Free the array allocated with pgm_allocarray() containing
- the given number of rows.
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- void pgm_freerow( gray* grayrow )
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- Free a row of grays.
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- READING FILES
- void pgm_readpgminit( FILE* fp, int* colsP, int* rowsP, gray* maxvalP, int* formatP )
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- Page 1 (printed 10/19/91)
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- libpgm(3) AMIGA libpgm(3)
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- Read the header from a PGM file, filling in the rows, cols,
- maxval and format variables.
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- void pgm_readpgmrow( FILE* fp, gray* grayrow, int cols, gray maxval, int format )
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- Read a row of grays into the grayrow array. Format, cols,
- and maxval were filled in by pgm_readpgminit().
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- gray** pgm_readpgm( FILE* fp, int* colsP, int* rowsP, gray* maxvalP )
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- Read an entire graymap file into memory, returning the
- allocated array and filling in the rows, cols and maxval
- variables. This function combines pgm_readpgminit(),
- pgm_allocarray() and pgm_readpgmrow().
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- WRITING FILES
- void pgm_writepgminit( FILE* fp, int cols, int rows, gray maxval, int forceplain )
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- Write the header for a portable graymap file. The
- forceplain flag forces a plain-format file to be written, as
- opposed to a raw-format one.
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- void pgm_writepgmrow( FILE* fp, gray* grayrow, int cols, gray maxval, int forceplain )
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- Write a row from a portable graymap.
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- void pgm_writepgm( FILE* fp, gray** grays, int cols, int rows, gray maxval, int forceplain )
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- Write the header and all data for a portable graymap. This
- function combines pgm_writepgminit() and pgm_writepgmrow().
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- SEE ALSO
- libpbm(3), libppm(3), libpnm(3)
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- AUTHOR
- Copyright (C) 1989, 1991 by Tony Hansen and Jef Poskanzer.
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- Page 2 (printed 10/19/91)
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