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/* rawtoppm.c - convert raw RGB bytes into a portable pixmap
**
** Copyright (C) 1991 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 <math.h>
#include "ppm.h"
static void dorowskip ARGS(( FILE* ifp, int rowskip ));
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
pixel* pixrow;
register pixel* pP;
int argn, headerskip, rowskip, rows, cols, row, i;
register int col;
int order;
#define ORD_RGB 1
#define ORD_RBG 2
#define ORD_GRB 3
#define ORD_GBR 4
#define ORD_BRG 5
#define ORD_BGR 6
int interleave;
#define INT_PIX 1
#define INT_ROW 2
int val1, val2, val3;
gray* grow1;
gray* grow2;
gray* grow3;
register gray* g1P;
register gray* g2P;
register gray* g3P;
const char* const usage = "[-headerskip N] [-rowskip N] [-rgb|-rbg|-grb|-gbr|-brg|-bgr] [-interpixel|-interrow] <width> <height> [rawfile]";
ppm_init( &argc, argv );
argn = 1;
headerskip = 0;
rowskip = 0;
order = ORD_RGB;
interleave = INT_PIX;
while ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-headerskip", 2 ) )
{
++argn;
if ( argn >= argc )
pm_usage( usage );
headerskip = atoi( argv[argn] );
}
else if ( pm_keymatch( argv[argn], "-rowskip", 3 ) )
{
++argn;
if ( argn >= argc )
pm_usage( usage );
rowskip = atoi( argv[argn] );
}
else if ( pm_keymatch( argv[argn], "-rgb", 3 ) )
order = ORD_RGB;
else if ( pm_keymatch( argv[argn], "-rbg", 3 ) )
order = ORD_RBG;
else if ( pm_keymatch( argv[argn], "-grb", 3 ) )
order = ORD_GRB;
else if ( pm_keymatch( argv[argn], "-gbr", 3 ) )
order = ORD_GBR;
else if ( pm_keymatch( argv[argn], "-brg", 3 ) )
order = ORD_BRG;
else if ( pm_keymatch( argv[argn], "-bgr", 3 ) )
order = ORD_BGR;
else if ( pm_keymatch( argv[argn], "-interpixel", 7 ) )
interleave = INT_PIX;
else if ( pm_keymatch( argv[argn], "-interrow", 7 ) )
interleave = INT_ROW;
else
pm_usage( usage );
++argn;
}
if ( argn + 2 > argc )
pm_usage( usage );
cols = atoi( argv[argn++] );
rows = atoi( argv[argn++] );
if ( cols <= 0 || rows <= 0 )
pm_usage( usage );
if ( argn < argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
ppm_writeppminit( stdout, cols, rows, (pixval) 255, 0 );
pixrow = ppm_allocrow( cols );
if ( interleave == INT_ROW )
{
grow1 = pgm_allocrow( cols );
grow2 = pgm_allocrow( cols );
grow3 = pgm_allocrow( cols );
}
for ( i = 0; i < headerskip; ++i )
{
val1 = getc( ifp );
if ( val1 == EOF )
pm_error( "EOF / read error" );
}
for ( row = 0; row < rows; ++row)
{
switch ( interleave )
{
case INT_PIX:
for ( col = 0, pP = pixrow; col < cols; ++col, ++pP )
{
val1 = getc( ifp );
if ( val1 == EOF )
pm_error( "EOF / read error" );
val2 = getc( ifp );
if ( val2 == EOF )
pm_error( "EOF / read error" );
val3 = getc( ifp );
if ( val3 == EOF )
pm_error( "EOF / read error" );
switch ( order )
{
case ORD_RGB:
PPM_ASSIGN( *pP, val1, val2, val3 );
break;
case ORD_RBG:
PPM_ASSIGN( *pP, val1, val3, val2 );
break;
case ORD_GRB:
PPM_ASSIGN( *pP, val2, val1, val3 );
break;
case ORD_GBR:
PPM_ASSIGN( *pP, val3, val1, val2 );
break;
case ORD_BRG:
PPM_ASSIGN( *pP, val2, val3, val1 );
break;
case ORD_BGR:
PPM_ASSIGN( *pP, val3, val2, val1 );
break;
}
}
dorowskip( ifp, rowskip );
break;
case INT_ROW:
for ( col = 0, g1P = grow1; col < cols; ++col, ++g1P )
{
val1 = getc( ifp );
if ( val1 == EOF )
pm_error( "EOF / read error" );
*g1P = val1;
}
dorowskip( ifp, rowskip );
for ( col = 0, g2P = grow2; col < cols; ++col, ++g2P )
{
val2 = getc( ifp );
if ( val2 == EOF )
pm_error( "EOF / read error" );
*g2P = val2;
}
dorowskip( ifp, rowskip );
for ( col = 0, g3P = grow3; col < cols; ++col, ++g3P )
{
val3 = getc( ifp );
if ( val3 == EOF )
pm_error( "EOF / read error" );
*g3P = val3;
}
dorowskip( ifp, rowskip );
for ( col = 0, pP = pixrow, g1P = grow1, g2P = grow2, g3P = grow3;
col < cols; ++col, ++pP, ++g1P, ++g2P, ++g3P )
{
switch ( order )
{
case ORD_RGB:
PPM_ASSIGN( *pP, *g1P, *g2P, *g3P );
break;
case ORD_RBG:
PPM_ASSIGN( *pP, *g1P, *g3P, *g2P );
break;
case ORD_GRB:
PPM_ASSIGN( *pP, *g2P, *g1P, *g3P );
break;
case ORD_GBR:
PPM_ASSIGN( *pP, *g3P, *g1P, *g2P );
break;
case ORD_BRG:
PPM_ASSIGN( *pP, *g2P, *g3P, *g1P );
break;
case ORD_BGR:
PPM_ASSIGN( *pP, *g3P, *g2P, *g1P );
break;
}
}
break;
}
ppm_writeppmrow( stdout, pixrow, cols, (pixval) 255, 0 );
}
pm_close( ifp );
pm_close( stdout );
exit( 0 );
}
static void
dorowskip( ifp, rowskip )
FILE* ifp;
int rowskip;
{
int i, val;
for ( i = 0; i < rowskip; ++i )
{
val = getc( ifp );
if ( val == EOF )
pm_error( "EOF / read error" );
}
}
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