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/* rasttopnm.c - read a Sun rasterfile and produce a portable anymap
**
** Copyright (C) 1989, 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 "pnm.h"
#include "rast.h"
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
struct rasterfile header;
colormap_t pr_colormap;
int grayscale;
struct pixrect* pr;
xel* xelrow;
register xel* xP;
int argn, rows, cols, format, depth, i, row, mask;
register int col;
xelval maxval;
xel zero, one;
int linesize;
unsigned char* data;
unsigned char* byteP;
pnm_init( &argc, argv );
argn = 1;
if ( argn != argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( "[rastfile]" );
/* Read in the rasterfile. First the header. */
if ( pr_load_header( ifp, &header ) != 0 )
pm_error( "unable to read in rasterfile header" );
cols = header.ras_width;
rows = header.ras_height;
depth = header.ras_depth;
if ( cols <= 0 )
pm_error( "invalid cols: %d", cols );
if ( rows <= 0 )
pm_error( "invalid rows: %d", rows );
/* If there is a color map, read it. */
grayscale = 1;
if ( header.ras_maplength != 0 )
{
if ( pr_load_colormap( ifp, &header, &pr_colormap ) != 0 )
pm_error( "unable to skip colormap data" );
for ( i = 0; i < header.ras_maplength / 3; ++i )
if ( pr_colormap.map[0][i] != pr_colormap.map[1][i] ||
pr_colormap.map[1][i] != pr_colormap.map[2][i] )
{
grayscale = 0;
break;
}
}
/* Check the depth and color map. */
switch ( depth )
{
case 1:
if ( header.ras_maptype == RMT_NONE && header.ras_maplength == 0 )
{
maxval = 1;
format = PBM_TYPE;
PNM_ASSIGN1( zero, maxval );
PNM_ASSIGN1( one, 0 );
}
else if ( header.ras_maptype == RMT_EQUAL_RGB &&
header.ras_maplength == 6 )
{
if ( grayscale )
{
maxval = 255;
format = PGM_TYPE;
PNM_ASSIGN1( zero, pr_colormap.map[0][0] );
PNM_ASSIGN1( one, pr_colormap.map[0][1] );
}
else
{
maxval = 255;
format = PPM_TYPE;
PPM_ASSIGN(
zero, pr_colormap.map[0][0], pr_colormap.map[1][0],
pr_colormap.map[2][0] );
PPM_ASSIGN(
one, pr_colormap.map[0][1], pr_colormap.map[1][1],
pr_colormap.map[2][1] );
}
}
else
pm_error(
"this depth-1 rasterfile has a non-standard colormap - "
"type %ld length %ld",
header.ras_maptype, header.ras_maplength );
break;
case 8:
if ( grayscale )
{
maxval = 255;
format = PGM_TYPE;
}
else if ( header.ras_maptype == RMT_EQUAL_RGB )
{
maxval = 255;
format = PPM_TYPE;
}
else
pm_error(
"this depth-8 rasterfile has a non-standard colormap - "
"type %ld length %ld",
header.ras_maptype, header.ras_maplength );
break;
case 24:
case 32:
if ( header.ras_maptype == RMT_NONE && header.ras_maplength == 0 )
;
else if ( header.ras_maptype == RMT_RAW || header.ras_maplength == 768 )
;
else
pm_error(
"this depth-%d rasterfile has a non-standard colormap - "
"type %ld length %ld",
depth, header.ras_maptype, header.ras_maplength );
maxval = 255;
format = PPM_TYPE;
break;
default:
pm_error(
"invalid depth: %d. Can only handle depth 1, 8, 24, or 32.",
depth );
}
/* Now load the data. The pixrect returned is a memory pixrect. */
if ( ( pr = pr_load_image( ifp, &header, NULL ) ) == NULL )
pm_error(
"unable to read in the image from the rasterfile" );
linesize = ( (struct mpr_data*) pr->pr_data )->md_linebytes;
data = ( (struct mpr_data*) pr->pr_data )->md_image;
pm_close( ifp );
/* Now write out the anymap. */
pnm_writepnminit( stdout, cols, rows, maxval, format, 0 );
xelrow = pnm_allocrow( cols );
switch ( PNM_FORMAT_TYPE(format) )
{
case PBM_TYPE:
pm_message( "writing PBM file" );
break;
case PGM_TYPE:
pm_message( "writing PGM file" );
break;
case PPM_TYPE:
pm_message( "writing PPM file" );
break;
default:
pm_error( "shouldn't happen" );
}
for ( row = 0; row < rows; ++row )
{
byteP = data;
switch ( depth )
{
case 1:
mask = 0x80;
for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
{
if ( mask == 0 )
{
++byteP;
mask = 0x80;
}
*xP = ( *byteP & mask ) ? one : zero;
mask = mask >> 1;
}
break;
case 8:
for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
{
if ( header.ras_maplength == 0 )
PNM_ASSIGN1( *xP, *byteP );
else if ( grayscale )
PNM_ASSIGN1( *xP, pr_colormap.map[0][*byteP] );
else
PPM_ASSIGN(
*xP, pr_colormap.map[0][*byteP],
pr_colormap.map[1][*byteP],
pr_colormap.map[2][*byteP] );
++byteP;
}
break;
case 24:
case 32:
for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
{
register xelval r, g, b;
if ( depth == 32 )
++byteP;
if ( header.ras_type == RT_FORMAT_RGB )
{
r = *byteP++;
g = *byteP++;
b = *byteP++;
}
else
{
b = *byteP++;
g = *byteP++;
r = *byteP++;
}
if ( header.ras_maplength == 0 )
PPM_ASSIGN( *xP, r, g, b );
else
PPM_ASSIGN(
*xP, pr_colormap.map[0][r], pr_colormap.map[1][g],
pr_colormap.map[2][b] );
}
break;
default:
pm_error( "can't happen" );
}
data += linesize;
pnm_writepnmrow( stdout, xelrow, cols, maxval, format, 0 );
}
pm_close( stdout );
exit( 0 );
}
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