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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
# include "bitmapConfig.h"
# include "bmintern.h"
# include <string.h>
# include <appDebugon.h>
/************************************************************************/
/* */
/* Find line segments in an image. */
/* */
/************************************************************************/
typedef struct FindLineSegmentsJob
{
int flsjPixelSize;
int flsjX0;
int flsjY0;
int flsjX1;
int flsjY1;
BitmapDescription flsjBdSel;
unsigned char * flsjBufSel;
BitmapDescription flsjBdSegs;
unsigned char * flsjBufSegs;
void * flsjThrough;
BM_SEG_FUN flsjSegFun;
} FindLineSegmentsJob;
static void bmFoundLineSegment( void * voidflsj,
int row,
int col )
{
FindLineSegmentsJob * flsj= (FindLineSegmentsJob *)voidflsj;
(*flsj->flsjSegFun)( flsj->flsjThrough,
flsj->flsjX0+ col, flsj->flsjY0+ row,
flsj->flsjX1+ col, flsj->flsjY1+ row );
return;
}
/************************************************************************/
/* */
/* Start a FindLineSegments job. */
/* */
/************************************************************************/
static void bmInitFindLineSegmentsJob( FindLineSegmentsJob * flsj )
{
flsj->flsjPixelSize= 0;
flsj->flsjX0= 0;
flsj->flsjY0= 0;
flsj->flsjX1= 0;
flsj->flsjY1= 0;
bmInitDescription( &(flsj->flsjBdSel) );
flsj->flsjBufSel= (unsigned char *)0;
bmInitDescription( &(flsj->flsjBdSegs) );
flsj->flsjBufSegs= (unsigned char *)0;
flsj->flsjThrough= (void *)0;
flsj->flsjSegFun= (BM_SEG_FUN)0;
return;
}
static int bmStartFindLineSegmentsJob( FindLineSegmentsJob * flsj,
void * through,
BM_SEG_FUN segFun,
int size,
int x0,
int y0,
int x1,
int y1 )
{
if ( bmMorphoLineElement( &(flsj->flsjBdSel), &(flsj->flsjBufSel),
size, size, x0, y0, x1, y1 ) )
{ LDEB(size); return -1; }
flsj->flsjPixelSize= size;
flsj->flsjX0= x0;
flsj->flsjY0= y0;
flsj->flsjX1= x1;
flsj->flsjY1= y1;
flsj->flsjThrough= through;
flsj->flsjSegFun= segFun;
return 0;
}
static void bmCleanFindLineSegmentsJob( FindLineSegmentsJob * flsj )
{
/**/
bmCleanDescription( &(flsj->flsjBdSel) );
if ( flsj->flsjBufSel )
{ free( flsj->flsjBufSel ); }
/**/
bmCleanDescription( &(flsj->flsjBdSegs) );
if ( flsj->flsjBufSegs )
{ free( flsj->flsjBufSegs ); }
return;
}
/************************************************************************/
/* */
/* Find the line segments of a certain fixed length in an image. */
/* */
/* This is done by eroding the image with structuring elements that */
/* correspond to the possible line segments through the center of */
/* a square with the given size. */
/* */
/************************************************************************/
static int bmRunFindLineSegmentsJob( FindLineSegmentsJob * flsj,
const BitmapDescription * bdIn,
const unsigned char * bufIn,
void * through,
BM_SEG_FUN segFun,
int size,
int x0,
int y0,
int x1,
int y1 )
{
const unsigned char invertMaskSegs= 0x00;
if ( bmStartFindLineSegmentsJob( flsj, through, segFun,
size, x0, y0, x1, y1 ) )
{ LDEB(size); return -1; }
if ( bmMorphoErode( &(flsj->flsjBdSegs), bdIn,
&(flsj->flsjBufSegs), bufIn,
&(flsj->flsjBdSel), flsj->flsjBufSel,
( size+ 1 )/ 2, ( size+ 1 )/ 2 ) )
{ LDEB(1); return -1; }
bmForAll1Pixels( &(flsj->flsjBdSegs), flsj->flsjBufSegs,
invertMaskSegs, (void *)flsj, bmFoundLineSegment );
bmCleanFindLineSegmentsJob( flsj );
bmInitFindLineSegmentsJob( flsj );
return 0;
}
int bmFindLineSegments( const BitmapDescription * bdIn,
const unsigned char * bufIn,
int size,
void * through,
BM_SEG_FUN segFun )
{
int rval= 0;
FindLineSegmentsJob flsj;
int i;
bmInitFindLineSegmentsJob( &flsj );
if ( bdIn->bdBitsPerPixel != 1 )
{ LDEB(bdIn->bdBitsPerPixel); rval= -1; goto ready; }
for ( i= 0; i < size; i++ )
{
if ( bmRunFindLineSegmentsJob( &flsj, bdIn, bufIn, through, segFun,
size, i, 0, size- i- 1, size- 1 ) )
{ LDEB(i); rval= -1; goto ready; }
if ( bmRunFindLineSegmentsJob( &flsj, bdIn, bufIn, through, segFun,
size, 0, i, size- 1, size- i- 1 ) )
{ LDEB(i); rval= -1; goto ready; }
}
ready:
bmCleanFindLineSegmentsJob( &flsj );
return rval;
}
|
