1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/* 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"
/*--------------------------
CMUWN Header format:
32 bit const magic = 0xf10040bb ;
32 bit int width;
32 bit int height;
16 bit int depth;
values are big-endian.
--------------------------*/
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";
uint32_t const cmuwmMagic = 0xf10040bb;
long l;
short s;
int rc;
rc = pm_readbiglong(ifP, &l);
if (rc == -1 )
pm_error("%s", initReadError);
if ((uint32_t)l != cmuwmMagic)
pm_error("bad magic number in CMU window manager file");
rc = pm_readbiglong(ifP, &l);
if (rc == -1)
pm_error("%s", initReadError);
*colsP = l;
rc = pm_readbiglong(ifP, &l);
if (rc == -1 )
pm_error("%s", initReadError);
*rowsP = l;
rc = pm_readbigshort(ifP, &s);
if (rc == -1)
pm_error("%s", initReadError);
*depthP = s;
}
int
main(int argc,
const char ** argv) {
FILE * ifP;
unsigned char * bitrow;
unsigned int rows, cols, depth;
unsigned int row;
const char * inputFileName;
pm_proginit(&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);
}
pbm_freerow_packed(bitrow);
pm_close(ifP);
pm_close(stdout);
return 0;
}
|
