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
|
/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: paletteimageaccessor.hxx,v $
*
* $Revision: 1.6 $
*
* last change: $Author: thb $ $Date: 2006-06-28 16:50:19 $
*
* 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_PALETTEIMAGEACCESSOR_HXX
#define INCLUDED_BASEBMP_PALETTEIMAGEACCESSOR_HXX
#include <basebmp/metafunctions.hxx>
#include <basebmp/accessor.hxx>
#include <vigra/numerictraits.hxx>
#include <vigra/mathutil.hxx>
#include <algorithm>
#include <functional>
namespace basebmp
{
/** Access (possibly packed-pixel) data via palette indirection
*/
template< typename Valuetype, typename Datatype > class PaletteImageAccessor
{
public:
typedef Valuetype value_type;
typedef Datatype data_type;
typedef typename remove_const<data_type>::type count_type;
private:
const value_type* palette;
count_type num_entries;
double norm( value_type const& rLHS,
value_type const& rRHS ) const
{
return (rRHS - rLHS).magnitude();
}
data_type find_best_match(value_type const& v) const
{
// TODO(P3): use table-based/octree approach here!
const value_type* best_entry;
const value_type* palette_end( palette+num_entries );
if( (best_entry=std::find( palette, palette_end, v)) != palette_end )
return best_entry-palette;
// TODO(F3): HACK. Need palette traits, and an error function
// here. We blatantly assume value_type is a normed linear
// space.
const value_type* curr_entry( palette );
best_entry = curr_entry;
while( curr_entry != palette_end )
{
if( norm(*curr_entry,*best_entry) > norm(*curr_entry,v) )
best_entry = curr_entry;
++curr_entry;
}
return best_entry-palette;
}
value_type toCol( value_type const& rCol ) const
{
return rCol;
}
public:
PaletteImageAccessor() :
palette(0),
num_entries(0)
{}
PaletteImageAccessor( const value_type* pPalette,
data_type numEntries ) :
palette(pPalette),
num_entries(numEntries)
{}
data_type lookup(value_type const& v) const { return find_best_match(v); }
template< class Iterator >
value_type operator()(Iterator const& i) const { return toCol(palette[i.get()]); }
value_type operator()(data_type const* i) const { return toCol(palette[*i]); }
template< class Iterator, class Difference >
value_type operator()(Iterator const& i, Difference const& diff) const
{
return toCol(palette[i.get(diff)]);
}
template< typename V, class Iterator >
void set(V const& value, Iterator const& i) const
{
i.set(
find_best_match(
vigra::detail::RequiresExplicitCast<value_type>::cast(value) ));
}
template< typename V, class Iterator, class Difference >
void set(V const& value, Iterator const& i, Difference const& diff) const
{
i.set(
find_best_match(
vigra::detail::RequiresExplicitCast<value_type>::cast(value)),
diff );
}
};
//-----------------------------------------------------------------------------
/// Retrieve raw pixel data accessor for given Accessor type
template< class Accessor > struct rawAccessor
{
// generic case: both accessors are the same
typedef Accessor type;
};
template< typename DataType > struct RawAccessor : public StandardAccessor< DataType >
{
RawAccessor() {}
// converting constructor, which in fact discards argument
template< typename ValueType > explicit RawAccessor(
const PaletteImageAccessor< ValueType, DataType >& ) {}
};
// specialization for PaletteImageAccessor, to provide the
// corresponding StandardAccessor to the pixel index values
template< typename ValueType, typename DataType >
struct rawAccessor< PaletteImageAccessor< ValueType, DataType > >
{
typedef RawAccessor< DataType > type;
};
//-----------------------------------------------------------------------------
/// Retrieve stand-alone color lookup function for given Accessor type
template< class Accessor > struct colorLookup
{
// generic case: accessor has no lookup functionality
typedef std::project2nd< Accessor, typename Accessor::value_type > type;
};
/** Lookup index value for given Color value in PaletteImageAccessor
*/
template< class Accessor > struct ColorLookup
{
typename Accessor::data_type operator()( const Accessor& acc,
typename Accessor::value_type v )
{
return acc.lookup(v);
}
};
// specialization for PaletteImageAccessor, to provide the
// corresponding ColorLookup functor
template< typename ValueType, typename DataType >
struct colorLookup< PaletteImageAccessor< ValueType, DataType > >
{
typedef ColorLookup< PaletteImageAccessor< ValueType, DataType > > type;
};
} // namespace basebmp
#endif /* INCLUDED_BASEBMP_PALETTEIMAGEACCESSOR_HXX */
|
