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/* cmuwmtopbm.c - read a CMU window manager bitmap and produce a PBM image.
**
** 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.
*/
/* 2006.10 (afu)
Changed bitrow from plain to raw, read function from getc() to fread(),
write function from pbm_writepbmrow() to pbm_writepbmrow_packed().
Retired bitwise transformation functions.
This program does not check the pad bits at the end of each row.
*/
#include "pbm.h"
#include "cmuwm.h"
static void
readCmuwmHeader(FILE * const ifP,
unsigned int * const colsP,
unsigned int * const rowsP,
unsigned int * const depthP) {
const char * const initReadError =
"CMU window manager header EOF / read error";
long l;
short s;
int rc;
rc = pm_readbiglong(ifP, &l);
if (rc == -1 )
pm_error(initReadError);
if (l != CMUWM_MAGIC)
pm_error("bad magic number in CMU window manager file");
rc = pm_readbiglong(ifP, &l);
if (rc == -1)
pm_error(initReadError);
*colsP = l;
rc = pm_readbiglong(ifP, &l);
if (rc == -1 )
pm_error(initReadError);
*rowsP = l;
rc = pm_readbigshort(ifP, &s);
if (rc == -1)
pm_error(initReadError);
*depthP = s;
}
int
main(int argc,
char * argv[]) {
FILE * ifP;
unsigned char * bitrow;
unsigned int rows, cols, depth;
unsigned int row;
const char * inputFileName;
pbm_init(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments (%u). "
"Only argument is optional input file", argc-1);
if (argc-1 == 1)
inputFileName = argv[1];
else
inputFileName = "-";
ifP = pm_openr(inputFileName);
readCmuwmHeader(ifP, &cols, &rows, &depth);
if (depth != 1)
pm_error("CMU window manager file has depth of %u, must be 1", depth);
pbm_writepbminit(stdout, cols, rows, 0);
bitrow = pbm_allocrow_packed(cols);
for (row = 0; row < rows; ++row) {
unsigned int const bytesPerRow = pbm_packed_bytes(cols);
unsigned int byteSeq;
size_t bytesRead;
bytesRead = fread(bitrow, 1, bytesPerRow, ifP);
if (bytesRead != bytesPerRow)
pm_error("CWU window manager bitmap EOF / read error");
/* Invert all bits in row - raster formats are similar.
CMUWM Black:0 White:1 End of row padded with 1
PBM Black:1 White:0 End preferably padded with 0
*/
for (byteSeq = 0; byteSeq < bytesPerRow; ++byteSeq)
bitrow[byteSeq] = ~bitrow[byteSeq];
pbm_writepbmrow_packed(stdout, bitrow, cols, 0);
}
pm_close(ifP);
pm_close(stdout);
return 0;
}
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