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/***************************************************************************
PBMTOMDA: Convert PBM to Microdesign area
Copyright (C) 1999,2004 John Elliott <jce@seasip.demon.co.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
******************************************************************************/
#include <stdbool.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "pbm.h"
#include "mallocvar.h"
#include "shhopt.h"
struct CmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFileNm;
unsigned int dscale;
unsigned int invert;
};
static void
parseCommandLine(int argc, const char ** argv,
struct CmdlineInfo * const cmdlineP) {
/*----------------------------------------------------------------------------
Note that the file spec array we return is stored in the storage that
was passed to as as the argv array.
-----------------------------------------------------------------------------*/
optEntry * option_def;
optStruct3 opt;
unsigned int option_def_index;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENT3 */
OPTENT3(0, "dscale", OPT_FLAG, NULL, &cmdlineP->dscale, 0);
OPTENT3(0, "invert", OPT_FLAG, NULL, &cmdlineP->invert, 0);
opt.opt_table = option_def;
opt.short_allowed = false; /* We have no short (old-fashioned) options */
opt.allowNegNum = false; /* We have no parms that are negative numbers */
pm_optParseOptions4(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others */
if (argc-1 < 1)
cmdlineP->inputFileNm = "-";
else if (argc-1 == 1)
cmdlineP->inputFileNm = argv[1];
else
pm_error("Program takes at most one argument: input file name");
free(option_def);
}
/* I'm being somewhat conservative in the PBM -> MDA translation. I output
* only the MD2 format and don't allow RLE over the ends of lines.
*/
typedef unsigned char Mdbyte;
/* Encode 8 pixels as a byte */
static Mdbyte
encode(bit ** const bits,
int const row,
int const col) {
int n;
int mask;
Mdbyte b;
mask = 0x80; /* initial value */
b = 0; /* initial value */
for (n = 0; n < 8; n++) {
if (bits[row][col+n] == PBM_BLACK) b |= mask;
mask = mask >> 1;
}
return b;
}
static void
doTranslation(bit ** const bits,
unsigned int const nOutCols,
unsigned int const nOutRows,
unsigned int const nInRows,
bool const mustInvert,
bool const mustScale) {
/*----------------------------------------------------------------------------
Translate a pbm to MD2 format, one row at a time
-----------------------------------------------------------------------------*/
unsigned int const step = mustScale ? 2 : 1;
unsigned int row;
Mdbyte * mdrow; /* malloc'ed */
MALLOCARRAY(mdrow, nOutCols);
if (mdrow == NULL)
pm_error("Unable to allocate memory for %u columns", nOutCols);
for (row = 0; row < nOutRows; row += step) {
unsigned int col;
/* Encode image into non-compressed bitmap */
for (col = 0; col < nOutCols; ++col) {
Mdbyte b;
if (row < nInRows)
b = encode(bits, row, col * 8);
else
b = 0xff; /* All black */
mdrow[col] = mustInvert ? b : ~b;
}
/* Encoded. Now RLE it */
for (col = 0; col < nOutCols; ) {
Mdbyte const b = mdrow[col];
if (b != 0xFF && b != 0) {
/* Normal byte */
putchar(b);
++col;
} else {
/* RLE a run of 0s or 0xFFs */
unsigned int x1;
for (x1 = col; x1 < nOutCols; ++x1) {
if (mdrow[x1] != b) break;
assert(x1 >= col);
if (x1 - col > 256) break;
}
assert(x1 >= col);
x1 -= col; /* x1 = no. of repeats */
if (x1 == 256) x1 = 0;
putchar(b);
putchar(x1);
col += x1;
}
}
}
free(mdrow);
}
int
main(int argc, const char ** argv) {
const char * const headerValue = ".MDAMicroDesignPCWv1.00\r\npbm2mda\r\n";
struct CmdlineInfo cmdline;
FILE * ifP;
unsigned int nOutRowsUnrounded; /* Before rounding up to multiple of 4 */
unsigned int nOutCols, nOutRows;
int nInCols, nInRows;
bit ** bits;
Mdbyte header[128];
int rc;
pm_proginit(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
/* Output v2-format MDA images. Simulate MDA header...
* 2004-01-11: Hmm. Apparently some (but not all) MDA-reading
* programs insist on the program identifier being exactly
* 'MicroDesignPCW'. The spec does not make this clear. */
memcpy(header + 0, headerValue, strlen(headerValue));
memset(header + strlen(headerValue),
0x00,
sizeof(header)-strlen(headerValue));
ifP = pm_openr(cmdline.inputFileNm);
bits = pbm_readpbm(ifP, &nInCols, &nInRows);
nOutRowsUnrounded = cmdline.dscale ? nInRows/2 : nInRows;
nOutRows = ((nOutRowsUnrounded + 3) / 4) * 4;
/* MDA wants rows a multiple of 4 */
nOutCols = nInCols / 8;
rc = fwrite(header, 1, 128, stdout);
if (rc < 128)
pm_error("Unable to write header to output file. errno=%d (%s)",
errno, strerror(errno));
pm_writelittleshort(stdout, nOutRows);
pm_writelittleshort(stdout, nOutCols);
doTranslation(bits, nOutCols, nOutRows, nInRows,
!!cmdline.invert, !!cmdline.dscale);
pm_close(ifP);
fflush(stdout);
pbm_freearray(bits, nInRows);
return 0;
}
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