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- /* libpgm1.c - pgm utility library part 1
- **
- ** Copyright (C) 1989 by Jef Poskanzer.
- **
- ** Permission to use, copy, modify, and distribute this software and its
- ** documentation for any purpose and without fee is hereby granted, provided
- ** that the above copyright notice appear in all copies and that both that
- ** copyright notice and this permission notice appear in supporting
- ** documentation. This software is provided "as is" without express or
- ** implied warranty.
- */
-
- #include "pgm.h"
- #include "libpgm.h"
- #include "pbm.h"
- #include "libpbm.h"
-
- void
- pgm_init( argcP, argv )
- int* argcP;
- char* argv[];
- {
- pbm_init( argcP, argv );
- }
-
- void
- pgm_readpgminitrest( file, colsP, rowsP, maxvalP )
- FILE* file;
- int* colsP;
- int* rowsP;
- gray* maxvalP;
- {
- int maxval;
-
- /* Read size. */
- *colsP = pbm_getint( file );
- *rowsP = pbm_getint( file );
-
- /* Read maxval. */
- maxval = pbm_getint( file );
- if ( maxval > PGM_MAXMAXVAL )
- pm_error( "maxval is too large - try reconfiguring with PGM_BIGGRAYS" );
- *maxvalP = maxval;
- }
-
- gray pgm_pbmmaxval = 1;
-
- void
- pgm_readpgminit( file, colsP, rowsP, maxvalP, formatP )
- FILE* file;
- int* colsP;
- int* rowsP;
- int* formatP;
- gray* maxvalP;
- {
- /* Check magic number. */
- *formatP = pbm_readmagicnumber( file );
- switch ( PGM_FORMAT_TYPE(*formatP) )
- {
- case PGM_TYPE:
- pgm_readpgminitrest( file, colsP, rowsP, maxvalP );
- break;
-
- case PBM_TYPE:
- pbm_readpbminitrest( file, colsP, rowsP );
- *maxvalP = pgm_pbmmaxval;
- break;
-
- default:
- pm_error( "bad magic number - not a pgm or pbm file" );
- }
- }
-
- #if __STDC__
- void
- pgm_readpgmrow( FILE* file, gray* grayrow, int cols, gray maxval, int format )
- #else /*__STDC__*/
- void
- pgm_readpgmrow( file, grayrow, cols, maxval, format )
- FILE* file;
- gray* grayrow;
- int cols;
- gray maxval;
- int format;
- #endif /*__STDC__*/
- {
- register int col;
- register gray* gP;
- bit* bitrow;
- register bit* bP;
-
- switch ( format )
- {
- case PGM_FORMAT:
- for ( col = 0, gP = grayrow; col < cols; ++col, ++gP )
- {
- *gP = pbm_getint( file );
- #ifdef DEBUG
- if ( *gP > maxval )
- pm_error( "value out of bounds (%u > %u)", *gP, maxval );
- #endif /*DEBUG*/
- }
- break;
-
- case RPGM_FORMAT:
- for ( col = 0, gP = grayrow; col < cols; ++col, ++gP )
- {
- *gP = pbm_getrawbyte( file );
- #ifdef DEBUG
- if ( *gP > maxval )
- pm_error( "value out of bounds (%u > %u)", *gP, maxval );
- #endif /*DEBUG*/
- }
- break;
-
- case PBM_FORMAT:
- case RPBM_FORMAT:
- bitrow = pbm_allocrow( cols );
- pbm_readpbmrow( file, bitrow, cols, format );
- for ( col = 0, gP = grayrow, bP = bitrow; col < cols; ++col, ++gP, ++bP )
- *gP = ( *bP == PBM_WHITE ) ? maxval : 0;
- pbm_freerow( bitrow );
- break;
-
- default:
- pm_error( "can't happen" );
- }
- }
-
- gray**
- pgm_readpgm( file, colsP, rowsP, maxvalP )
- FILE* file;
- int* colsP;
- int* rowsP;
- gray* maxvalP;
- {
- gray** grays;
- int row;
- int format;
-
- pgm_readpgminit( file, colsP, rowsP, maxvalP, &format );
-
- grays = pgm_allocarray( *colsP, *rowsP );
-
- for ( row = 0; row < *rowsP; ++row )
- pgm_readpgmrow( file, grays[row], *colsP, *maxvalP, format );
-
- return grays;
- }
-