summaryrefslogtreecommitdiff
path: root/basebmp/inc/basebmp/pixeliterator.hxx
blob: c3b2bf01ec03221069c935a2be7af635d517366a (plain)
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: pixeliterator.hxx,v $
 *
 *  $Revision: 1.3 $
 *
 *  last change: $Author: thb $ $Date: 2006-06-02 08:36:14 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/

#ifndef INCLUDED_BASEBMP_PIXELITERATOR_HXX
#define INCLUDED_BASEBMP_PIXELITERATOR_HXX

#include <basebmp/metafunctions.hxx>
#include <basebmp/stridedarrayiterator.hxx>

#include <boost/static_assert.hpp>
#include <vigra/metaprogramming.hxx>
#include <vigra/diff2d.hxx>

namespace basebmp
{

template< typename Valuetype > class PixelColumnIterator
{
public:
    typedef Valuetype                           value_type;
    typedef Valuetype&                          reference;
    typedef Valuetype*                          pointer;
    typedef int                                 difference_type;
    typedef image_traverser_tag                 iterator_category;

    typedef StridedArrayIterator< value_type >  MoveY;

private:
    MoveY           y;

    bool equal( PixelColumnIterator const & rhs ) const
    {
        return rhs.y == y;
    }

    bool less( PixelColumnIterator const & rhs ) const
    {
        return y < rhs.y;
    }

public:
    PixelColumnIterator() :
        y(0)
    {}

    explicit PixelColumnIterator( const MoveY& pos ) :
        y(pos)
    {}

    PixelColumnIterator( const MoveY& pos, int x ) :
        y(pos,x)
    {}

    PixelColumnIterator& operator+=( difference_type d )
    {
        y += d;
        return *this;
    }

    PixelColumnIterator& operator-=( difference_type d )
    {
        y -= d;
        return *this;
    }

    PixelColumnIterator operator+( difference_type d )
    {
        PixelColumnIterator res(*this);
        res += d;
        return res;
    }

    PixelColumnIterator operator-( difference_type d )
    {
        PixelColumnIterator res(*this);
        res -= d;
        return res;
    }

    PixelColumnIterator& operator++()
    {
        ++y;
        return *this;
    }

    PixelColumnIterator& operator--()
    {
        --y;
        return *this;
    }

    PixelColumnIterator operator++(int)
    {
        PixelColumnIterator res(*this);
        ++y;
        return res;
    }

    PixelColumnIterator operator--(int)
    {
        PixelColumnIterator res(*this);
        --y;
        return res;
    }

    bool operator==(PixelColumnIterator const & rhs) const
    {
        return equal( rhs );
    }

    bool operator!=(PixelColumnIterator const & rhs) const
    {
        return !equal( rhs );
    }

    bool operator<(PixelColumnIterator const & rhs) const
    {
        return less(rhs);
    }

    bool operator<=(PixelColumnIterator const & rhs) const
    {
        return !less(rhs);
    }

    bool operator>(PixelColumnIterator const & rhs) const
    {
        return rhs.less(*this);
    }

    bool operator>=(PixelColumnIterator const & rhs) const
    {
        return !rhs.less(*this);
    }

    difference_type operator-(PixelColumnIterator const & rhs) const
    {
        return y - rhs.y;
    }

    value_type get() const
    {
        return *y();
    }

    value_type get(difference_type d) const
    {
        return *y(d);
    }

    void set( value_type v ) const
    {
        *y() = v;
    }

    void set( value_type v, difference_type d ) const
    {
        *y(d) = v;
    }

    reference operator*() const
    {
        return *y();
    }

    pointer operator->() const
    {
        return y();
    }

    reference operator[](difference_type d) const
    {
        return *y(d);
    }

    reference operator()(int dy) const
    {
        return *y(dy);
    }
};

template< typename Valuetype > class PixelIterator
{
public:
    typedef Valuetype                          value_type;
    typedef Valuetype&                         reference;
    typedef Valuetype*                         pointer;
    typedef vigra::Diff2D                      difference_type;
    typedef image_traverser_tag                iterator_category;
    typedef pointer                            row_iterator;
    typedef PixelColumnIterator<value_type>    column_iterator;

    typedef int                                MoveX;
    typedef StridedArrayIterator< value_type > MoveY;

    // TODO(F2): direction of iteration (ImageIterator can be made to
    // run backwards)

private:
    bool equal(PixelIterator const & rhs) const
    {
        return (x == rhs.x) && (y == rhs.y);
    }

    pointer current() const
    {
        return y() + x;
    }

    pointer current(int dx, int dy) const
    {
        return y(dy) + x+dy;
    }

public:
    PixelIterator() :
        x(0),
        y(0)
    {}

    PixelIterator(pointer base, int ystride) :
        x(0),
        y(ystride,base)
    {}

    bool operator==(PixelIterator const & rhs) const
    {
        return equal(rhs);
    }

    bool operator!=(PixelIterator const & rhs) const
    {
        return !equal(rhs);
    }

    difference_type operator-(PixelIterator const & rhs) const
    {
        return difference_type(x - rhs.x, y - rhs.y);
    }

    MoveX x;
    MoveY y;

    PixelIterator & operator+=(difference_type const & s)
    {
        x += s.x;
        y += s.y;
        return *this;
    }

    PixelIterator & operator-=(difference_type const & s)
    {
        x -= s.x;
        y -= s.y;
        return *this;
    }

    PixelIterator operator+(difference_type const & s) const
    {
        PixelIterator ret(*this);
        ret += s;
        return ret;
    }

    PixelIterator operator-(difference_type const & s) const
    {
        PixelIterator ret(*this);
        ret -= s;
        return ret;
    }

    row_iterator rowIterator() const
    {
        return row_iterator(y()+x);
    }

    column_iterator columnIterator() const
    {
        return column_iterator(y,x);
    }

    value_type get() const
    {
        return *current();
    }

    value_type get(difference_type const & d) const
    {
        return *current(d.y, d.x);
    }

    void set( value_type v ) const
    {
        *current() = v;
    }

    void set( value_type v, difference_type const & d ) const
    {
        *current(d.y,d.x) = v;
    }

    reference operator*() const
    {
        return *current();
    }

    pointer operator->() const
    {
        return current();
    }

    reference operator[]( const vigra::Diff2D& d ) const
    {
        return *current(d.x,d.y);
    }

    reference operator()(int dx, int dy) const
    {
        return *current(dx,dy);
    }

    pointer operator[](int dy) const
    {
        return y(dy) + x;
    }
};

} // namespace basebmp

#endif /* INCLUDED_BASEBMP_PIXELITERATOR_HXX */