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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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misc
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volume9
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pbmplus
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part11
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ppm
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libppm2.c
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C/C++ Source or Header
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1989-11-26
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175 lines
/* libppm2.c - ppm 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 <stdio.h>
#include "ppm.h"
#include "libppm.h"
void
ppm_writeppminit( file, cols, rows, maxval )
FILE *file;
int cols, rows;
pixval maxval;
{
#ifdef PBMPLUS_RAWBITS
if ( maxval <= 255 )
fprintf(
file, "%c%c\n%d %d\n%d\n", PPM_MAGIC1, RPPM_MAGIC2,
cols, rows, maxval );
else
fprintf(
file, "%c%c\n%d %d\n%d\n", PPM_MAGIC1, PPM_MAGIC2,
cols, rows, maxval );
#else /*PBMPLUS_RAWBITS*/
fprintf(
file, "%c%c\n%d %d\n%d\n", PPM_MAGIC1, PPM_MAGIC2,
cols, rows, maxval );
#endif /*PBMPLUS_RAWBITS*/
}
static int
putus( n, file )
unsigned short n;
FILE *file;
{
if ( n >= 10 )
if ( putus( n / 10, file ) == EOF )
return EOF;
return putc( n % 10 + '0', file );
}
#ifdef PBMPLUS_RAWBITS
static void
ppm_writeppmrowraw( file, pixelrow, cols, maxval )
FILE *file;
pixel *pixelrow;
int cols;
pixval maxval;
{
register int col;
register pixel *pP;
register pixval val;
for ( col = 0, pP = pixelrow; col < cols; col++, pP++ )
{
val = PPM_GETR( *pP );
#ifdef DEBUG
if ( val > maxval )
pm_error( "r value out of bounds (%u > %u)", val, maxval, 0,0,0 );
#endif /*DEBUG*/
if ( putc( val, file ) == EOF )
pm_perror( 0 );
val = PPM_GETG( *pP );
#ifdef DEBUG
if ( val > maxval )
pm_error( "g value out of bounds (%u > %u)", val, maxval, 0,0,0 );
#endif /*DEBUG*/
if ( putc( val, file ) == EOF )
pm_perror( 0 );
val = PPM_GETB( *pP );
#ifdef DEBUG
if ( val > maxval )
pm_error( "b value out of bounds (%u > %u)", val, maxval, 0,0,0 );
#endif /*DEBUG*/
if ( putc( val, file ) == EOF )
pm_perror( 0 );
}
}
#endif /*PBMPLUS_RAWBITS*/
static void
ppm_writeppmrowplain( file, pixelrow, cols, maxval )
FILE *file;
pixel *pixelrow;
int cols;
pixval maxval;
{
register int col, charcount;
register pixel *pP;
register pixval val;
charcount = 0;
for ( col = 0, pP = pixelrow; col < cols; col++, pP++ )
{
if ( charcount >= 70 )
{
if ( putc( '\n', file ) == EOF )
pm_perror( 0 );
charcount = 0;
}
val = PPM_GETR( *pP );
#ifdef DEBUG
if ( val > maxval )
pm_error( "r value out of bounds (%u > %u)", val, maxval, 0,0,0 );
#endif /*DEBUG*/
if ( putus( val, file ) == EOF )
pm_perror( 0 );
if ( putc( ' ', file ) == EOF )
pm_perror( 0 );
val = PPM_GETG( *pP );
#ifdef DEBUG
if ( val > maxval )
pm_error( "g value out of bounds (%u > %u)", val, maxval, 0,0,0 );
#endif /*DEBUG*/
if ( putus( val, file ) == EOF )
pm_perror( 0 );
if ( putc( ' ', file ) == EOF )
pm_perror( 0 );
val = PPM_GETB( *pP );
#ifdef DEBUG
if ( val > maxval )
pm_error( "b value out of bounds (%u > %u)", val, maxval, 0,0,0 );
#endif /*DEBUG*/
if ( putus( val, file ) == EOF )
pm_perror( 0 );
if ( putc( ' ', file ) == EOF )
pm_perror( 0 );
if ( putc( ' ', file ) == EOF )
pm_perror( 0 );
charcount += 13;
}
if ( putc( '\n', file ) == EOF )
pm_perror( 0 );
}
void
ppm_writeppmrow( file, pixelrow, cols, maxval )
FILE *file;
pixel *pixelrow;
int cols;
pixval maxval;
{
#ifdef PBMPLUS_RAWBITS
if ( maxval <= 255 )
ppm_writeppmrowraw( file, pixelrow, cols, maxval );
else
ppm_writeppmrowplain( file, pixelrow, cols, maxval );
#else /*PBMPLUS_RAWBITS*/
ppm_writeppmrowplain( file, pixelrow, cols, maxval );
#endif /*PBMPLUS_RAWBITS*/
}
void
ppm_writeppm( file, pixels, cols, rows, maxval )
FILE *file;
pixel **pixels;
int cols, rows;
pixval maxval;
{
int row;
ppm_writeppminit( file, cols, rows, maxval );
for ( row = 0; row < rows; row++ )
ppm_writeppmrow( file, pixels[row], cols, maxval );
}