/*
* Convert a GEM .img file to PBM
*
* Author: Diomidis D. Spinellis
* (C) Copyright 1988 Diomidis D. Spinellis.
*
* 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 file is provided AS IS with no warranties of any kind. The author
* shall have no liability with respect to the infringement of copyrights,
* trade secrets or any patents by this file or any part thereof. In no
* event will the author be liable for any lost revenue or profits or
* other special, indirect and consequential damages.
*
* Comments and additions should be sent to the author:
*
* Diomidis D. Spinellis
* 1 Myrsinis Str.
* GR-145 62 Kifissia
* GREECE
*
* 92/07/11 Johann Haider
* Changed to read from stdin if file is omitted
* Changed to handle line length not a multipe of 8
*
* 94/01/31 Andreas Schwab (schwab@ls5.informatik.uni-dortmund.de)
* Changed to remove architecture dependency and conform to
* PBM coding standard.
* Added more tests for garbage.
*
* 2000/04/30 John Elliott <jce@seasip.demon.co.uk> Added ability to
* read 4-plane color IMG files. Therefore changed from PBM to PPM.
* Bryan changed it further to use the PNM facilities so it outputs
* both PBM and PPM in the Netpbm tradition. Name changed from
* gemtopbm to gemtopnm.
*/
#include <assert.h>
#include "pnm.h"
#define MAXVAL 3
#define LIGHT 2
#define DARK 1
#define BLACK 0
char pattern[8];
static void getinit ARGS ((FILE *file, int *colsP, int *rowsP, int *padrightP,
int *patlenP, int *planesP));
int
main(argc, argv)
int argc;
char *argv[];
{
int debug = 0;
FILE *f;
int row;
int rows, cols, padright, patlen, planes;
/* attributes of input image */
int type; /* The format type (PBM/PPM) of the output image */
bit *bitrow[4];
/* One row of input, one or four planes. (If one, only [0] is defined)*/
xel * xelrow; /* One row of output */
const char * const usage = "[-debug] [gem IMG file]";
int argn;
/* Process multiple planes by maintaining a separate row of bits for each
* plane. In a single-plane image, all we have to do is write out the
* first plane; in a multiple-plane image, we combine them just before writing
* out the row.
*/
pnm_init( &argc, argv );
argn = 1;
while (argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0')
{
if (pm_keymatch(argv[1], "-debug", 2))
debug = 1;
else
pm_usage (usage);
++argn;
}
if (argc == argn)
f = stdin;
else {
f = pm_openr (argv[argn]);
++argn;
}
if (argn != argc)
pm_usage (usage);
getinit (f, &cols, &rows, &padright, &patlen, &planes);
if (planes == 1)
type = PBM_TYPE;
else
type = PPM_TYPE;
pnm_writepnminit( stdout, cols, rows, MAXVAL, type, 0 );
overflow_add(cols, padright);
{
/* allocate input row data structure */
int plane;
for (plane = 0; plane < planes; plane++)
bitrow[plane] = malloc (cols + padright);
}
xelrow = pnm_allocrow(cols+padright); /* Output row */
for (row = 0; row < rows; ) {
int linerep;
int plane;
linerep = 1;
for (plane = 0; plane < planes; plane++) {
int col;
col = 0;
while (col < cols) {
int c;
switch (c = getc(f)) {
case 0x80: /* Bit String */
{
int j;
c = getc(f); /* Byte count */
if (debug)
pm_message("bit string of %d bytes", c);
if (col + c * 8 > cols + padright)
pm_error ("bad byte count");
for (j = 0; j < c; ++j) {
int cc, k;
cc = getc(f);
for (k = 0x80; k; k >>= 1) {
bitrow[plane][col] = (k & cc) ? 0 : 1;
++col;
}
}
}
break;
case 0: /* Pattern run */
{
int j, l;
c = getc(f); /* Repeat count */
if (debug)
pm_message("pattern run of %d repetitions", c);
/* line repeat */
if (c == 0) {
c = getc(f);
if (c != 0x00ff)
pm_error( "badly formed line repeat" );
linerep = getc(f);
break;
}
fread (pattern, 1, patlen, f);
if (col + c * patlen * 8 > cols + padright)
pm_error ("bad pattern repeat count");
for (j = 0; j < c; ++j)
for (l = 0; l < patlen; ++l) {
int k;
for (k = 0x80; k; k >>= 1) {
bitrow[plane][col] = (k & pattern[l]) ? 0 : 1;
++col;
}
}
}
break;
default: /* Solid run */
{
int l, j;
if (debug)
pm_message("solid run of %d bytes %s", c & 0x7f,
c & 0x80 ? "on" : "off" );
/* each byte had eight bits DSB */
l = (c & 0x80) ? 0: 1;
c = (c & 0x7f) * 8;
if (col + c > cols + padright)
pm_error ("bad solid run repeat count");
for (j = 0; j < c; ++j) {
bitrow[plane][col] = l;
++col;
}
}
break;
case EOF: /* End of file */
pm_error( "end of file reached" );
}
}
if ( debug )
pm_message( "EOL plane %d row %d", plane, row );
if (col != cols + padright)
pm_error( "EOL beyond edge" );
}
if (planes == 4) {
/* Construct a pixel from the 4 planes of bits for this row */
int col;
for (col = 0; col < cols; col++) {
int r, g, b, i;
const int r_bit = !bitrow[0][col];
const int g_bit = !bitrow[1][col];
const int b_bit = !bitrow[2][col];
i = bitrow[3][col];
/* Deal with weird GEM palette - white/black/gray are
encoded oddly
*/
if (r_bit == g_bit && g_bit == b_bit) {
/* It's black, white, or gray */
if (r_bit && i) r = LIGHT;
else if (r_bit) r = BLACK;
else if (i) r = MAXVAL;
else r = DARK;
g = b = r;
} else {
/* It's one of the twelve colored colors */
if (!i) {
/* Low intensity */
r = r_bit * LIGHT;
g = g_bit * LIGHT;
b = b_bit * LIGHT;
} else {
/* Normal intensity */
r = r_bit * MAXVAL;
g = g_bit * MAXVAL;
b = b_bit * MAXVAL;
}
}
PPM_ASSIGN(xelrow[col], r, g, b);
}
} else {
int col;
for (col = 0; col < cols; col++)
PNM_ASSIGN1(xelrow[col], bitrow[0][col]);
}
while (linerep--) {
pnm_writepnmrow( stdout, xelrow, cols, MAXVAL, type, 0 );
++row;
}
}
pnm_freerow(xelrow);
pm_close( f );
pm_close( stdout );
exit(0);
}
static void
getinit (file, colsP, rowsP, padrightP, patlenP, planesP)
FILE *file;
int *colsP;
int *rowsP;
int *padrightP;
int *patlenP;
int *planesP;
{
short s;
short headlen;
if (pm_readbigshort (file, &s) == -1) /* Image file version */
pm_error ("EOF / read error");
if (s != 1)
pm_error ("unknown version number (%d)", (int) s);
if (pm_readbigshort (file, &headlen) == -1) /* Header length in words */
pm_error ("EOF / read error");
if (headlen < 8)
pm_error ("short header (%d)", (int) headlen);
if (pm_readbigshort (file, &s) == -1) /* Number of planes */
pm_error ("EOF / read error");
if (s != 4 && s != 1)
pm_error ("This program can interpret IMGs with only 1 or 4 planes");
*planesP = s;
if (pm_readbigshort (file, &s) == -1) /* Pattern definition length (bytes) */
pm_error ("EOF / read error");
if (s < 1 || s > 8)
pm_error ("illegal pattern length (%d)", (int) s);
*patlenP = (int) s;
if (pm_readbigshort (file, &s) == -1 /* Pixel height (microns) */
|| pm_readbigshort (file, &s) == -1 /* Pixel height (microns) */
|| pm_readbigshort (file, &s) == -1) /* Scan line width */
pm_error ("EOF / read error");
*colsP = (int) s;
if (pm_readbigshort (file, &s) == -1) /* Number of scan line items */
pm_error ("EOF / read error");
*rowsP = (int) s;
*padrightP = 7 - ((*colsP + 7) & 7);
headlen -= 8;
while (headlen-- > 0)
{
(void) getc (file);
(void) getc (file);
}
}