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- /* libpgm2.c - pgm utility library part 2
- **
- ** 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"
-
- #if __STDC__
- void
- pgm_writepgminit( FILE* file, int cols, int rows, gray maxval, int forceplain )
- #else /*__STDC__*/
- void
- pgm_writepgminit( file, cols, rows, maxval, forceplain )
- FILE* file;
- int cols, rows;
- gray maxval;
- int forceplain;
- #endif /*__STDC__*/
- {
- #ifdef PBMPLUS_RAWBITS
- if ( maxval <= 255 && ! forceplain )
- fprintf(
- file, "%c%c\n%d %d\n%d\n", PGM_MAGIC1, RPGM_MAGIC2,
- cols, rows, maxval );
- else
- fprintf(
- file, "%c%c\n%d %d\n%d\n", PGM_MAGIC1, PGM_MAGIC2,
- cols, rows, maxval );
- #else /*PBMPLUS_RAWBITS*/
- fprintf(
- file, "%c%c\n%d %d\n%d\n", PGM_MAGIC1, PGM_MAGIC2,
- cols, rows, maxval );
- #endif /*PBMPLUS_RAWBITS*/
- }
-
- static void
- putus( n, file )
- unsigned short n;
- FILE* file;
- {
- if ( n >= 10 )
- putus( n / 10, file );
- (void) putc( n % 10 + '0', file );
- }
-
- #ifdef PBMPLUS_RAWBITS
- static void
- pgm_writepgmrowraw( file, grayrow, cols, maxval )
- FILE* file;
- gray* grayrow;
- int cols;
- gray maxval;
- {
- register int col;
- register gray* gP;
-
- for ( col = 0, gP = grayrow; col < cols; ++col, ++gP )
- {
- #ifdef DEBUG
- if ( *gP > maxval )
- pm_error( "value out of bounds (%u > %u)", *gP, maxval );
- #endif /*DEBUG*/
- (void) putc( *gP, file );
- }
- }
- #endif /*PBMPLUS_RAWBITS*/
-
- static void
- pgm_writepgmrowplain( file, grayrow, cols, maxval )
- FILE* file;
- gray* grayrow;
- int cols;
- gray maxval;
- {
- register int col, charcount;
- register gray* gP;
-
- charcount = 0;
- for ( col = 0, gP = grayrow; col < cols; ++col, ++gP )
- {
- if ( charcount >= 65 )
- {
- (void) putc( '\n', file );
- charcount = 0;
- }
- else if ( charcount > 0 )
- {
- (void) putc( ' ', file );
- ++charcount;
- }
- #ifdef DEBUG
- if ( *gP > maxval )
- pm_error( "value out of bounds (%u > %u)", *gP, maxval );
- #endif /*DEBUG*/
- putus( (unsigned long) *gP, file );
- charcount += 3;
- }
- if ( charcount > 0 )
- (void) putc( '\n', file );
- }
-
- #if __STDC__
- void
- pgm_writepgmrow( FILE* file, gray* grayrow, int cols, gray maxval, int forceplain )
- #else /*__STDC__*/
- void
- pgm_writepgmrow( file, grayrow, cols, maxval, forceplain )
- FILE* file;
- gray* grayrow;
- int cols;
- gray maxval;
- int forceplain;
- #endif /*__STDC__*/
- {
- #ifdef PBMPLUS_RAWBITS
- if ( maxval <= 255 && ! forceplain )
- pgm_writepgmrowraw( file, grayrow, cols, maxval );
- else
- pgm_writepgmrowplain( file, grayrow, cols, maxval );
- #else /*PBMPLUS_RAWBITS*/
- pgm_writepgmrowplain( file, grayrow, cols, maxval );
- #endif /*PBMPLUS_RAWBITS*/
- }
-
- #if __STDC__
- void
- pgm_writepgm( FILE* file, gray** grays, int cols, int rows, gray maxval, int forceplain )
- #else /*__STDC__*/
- void
- pgm_writepgm( file, grays, cols, rows, maxval, forceplain )
- FILE* file;
- gray** grays;
- int cols, rows;
- gray maxval;
- int forceplain;
- #endif /*__STDC__*/
- {
- int row;
-
- pgm_writepgminit( file, cols, rows, maxval, forceplain );
-
- for ( row = 0; row < rows; ++row )
- pgm_writepgmrow( file, grays[row], cols, maxval, forceplain );
- }
-