1*48cdb363SAndrew Rist /**************************************************************
2cdf0e10cSrcweir *
3*48cdb363SAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one
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7*48cdb363SAndrew Rist * to you under the Apache License, Version 2.0 (the
8*48cdb363SAndrew Rist * "License"); you may not use this file except in compliance
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11*48cdb363SAndrew Rist * http://www.apache.org/licenses/LICENSE-2.0
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20*48cdb363SAndrew Rist *************************************************************/
21*48cdb363SAndrew Rist
22*48cdb363SAndrew Rist
23cdf0e10cSrcweir
24cdf0e10cSrcweir #ifndef INCLUDED_BASEBMP_SCALEIMAGE_HXX
25cdf0e10cSrcweir #define INCLUDED_BASEBMP_SCALEIMAGE_HXX
26cdf0e10cSrcweir
27cdf0e10cSrcweir #include <osl/diagnose.h>
28cdf0e10cSrcweir
29cdf0e10cSrcweir #include <vigra/tuple.hxx>
30cdf0e10cSrcweir #include <vigra/copyimage.hxx>
31cdf0e10cSrcweir #include <vigra/basicimage.hxx>
32cdf0e10cSrcweir #include <vigra/iteratortraits.hxx>
33cdf0e10cSrcweir
34cdf0e10cSrcweir namespace basebmp
35cdf0e10cSrcweir {
36cdf0e10cSrcweir
37cdf0e10cSrcweir template< class SourceIter, class SourceAcc,
38cdf0e10cSrcweir class DestIter, class DestAcc >
scaleLine(SourceIter s_begin,SourceIter s_end,SourceAcc s_acc,DestIter d_begin,DestIter d_end,DestAcc d_acc)39cdf0e10cSrcweir void scaleLine( SourceIter s_begin,
40cdf0e10cSrcweir SourceIter s_end,
41cdf0e10cSrcweir SourceAcc s_acc,
42cdf0e10cSrcweir DestIter d_begin,
43cdf0e10cSrcweir DestIter d_end,
44cdf0e10cSrcweir DestAcc d_acc )
45cdf0e10cSrcweir {
46cdf0e10cSrcweir const int src_width = s_end - s_begin;
47cdf0e10cSrcweir const int dest_width = d_end - d_begin;
48cdf0e10cSrcweir
49cdf0e10cSrcweir OSL_ASSERT( src_width > 0 && dest_width > 0 );
50cdf0e10cSrcweir
51cdf0e10cSrcweir if( src_width >= dest_width )
52cdf0e10cSrcweir {
53cdf0e10cSrcweir // shrink
54cdf0e10cSrcweir int rem = 0;
55cdf0e10cSrcweir while( s_begin != s_end )
56cdf0e10cSrcweir {
57cdf0e10cSrcweir if( rem >= 0 )
58cdf0e10cSrcweir {
59cdf0e10cSrcweir d_acc.set( s_acc(s_begin), d_begin );
60cdf0e10cSrcweir
61cdf0e10cSrcweir rem -= src_width;
62cdf0e10cSrcweir ++d_begin;
63cdf0e10cSrcweir }
64cdf0e10cSrcweir
65cdf0e10cSrcweir rem += dest_width;
66cdf0e10cSrcweir ++s_begin;
67cdf0e10cSrcweir }
68cdf0e10cSrcweir }
69cdf0e10cSrcweir else
70cdf0e10cSrcweir {
71cdf0e10cSrcweir // enlarge
72cdf0e10cSrcweir int rem = -dest_width;
73cdf0e10cSrcweir while( d_begin != d_end )
74cdf0e10cSrcweir {
75cdf0e10cSrcweir if( rem >= 0 )
76cdf0e10cSrcweir {
77cdf0e10cSrcweir rem -= dest_width;
78cdf0e10cSrcweir ++s_begin;
79cdf0e10cSrcweir }
80cdf0e10cSrcweir
81cdf0e10cSrcweir d_acc.set( s_acc(s_begin), d_begin );
82cdf0e10cSrcweir
83cdf0e10cSrcweir rem += src_width;
84cdf0e10cSrcweir ++d_begin;
85cdf0e10cSrcweir }
86cdf0e10cSrcweir }
87cdf0e10cSrcweir }
88cdf0e10cSrcweir
89cdf0e10cSrcweir /** Scale an image using zero order interpolation (pixel replication)
90cdf0e10cSrcweir
91cdf0e10cSrcweir Source and destination range must be at least one pixel wide and
92cdf0e10cSrcweir high.
93cdf0e10cSrcweir
94cdf0e10cSrcweir @param s_begin
95cdf0e10cSrcweir Start iterator for source image
96cdf0e10cSrcweir
97cdf0e10cSrcweir @param s_end
98cdf0e10cSrcweir End iterator for source image
99cdf0e10cSrcweir
100cdf0e10cSrcweir @param s_acc
101cdf0e10cSrcweir Source accessor
102cdf0e10cSrcweir
103cdf0e10cSrcweir @param d_begin
104cdf0e10cSrcweir Start iterator for destination image
105cdf0e10cSrcweir
106cdf0e10cSrcweir @param d_end
107cdf0e10cSrcweir End iterator for destination image
108cdf0e10cSrcweir
109cdf0e10cSrcweir @param d_acc
110cdf0e10cSrcweir Destination accessor
111cdf0e10cSrcweir
112cdf0e10cSrcweir @param bMustCopy
113cdf0e10cSrcweir When true, scaleImage always copies source, even when doing 1:1
114cdf0e10cSrcweir copy
115cdf0e10cSrcweir */
116cdf0e10cSrcweir template< class SourceIter, class SourceAcc,
117cdf0e10cSrcweir class DestIter, class DestAcc >
scaleImage(SourceIter s_begin,SourceIter s_end,SourceAcc s_acc,DestIter d_begin,DestIter d_end,DestAcc d_acc,bool bMustCopy=false)118cdf0e10cSrcweir void scaleImage( SourceIter s_begin,
119cdf0e10cSrcweir SourceIter s_end,
120cdf0e10cSrcweir SourceAcc s_acc,
121cdf0e10cSrcweir DestIter d_begin,
122cdf0e10cSrcweir DestIter d_end,
123cdf0e10cSrcweir DestAcc d_acc,
124cdf0e10cSrcweir bool bMustCopy=false )
125cdf0e10cSrcweir {
126cdf0e10cSrcweir const int src_width ( s_end.x - s_begin.x );
127cdf0e10cSrcweir const int src_height( s_end.y - s_begin.y );
128cdf0e10cSrcweir
129cdf0e10cSrcweir const int dest_width ( d_end.x - d_begin.x );
130cdf0e10cSrcweir const int dest_height( d_end.y - d_begin.y );
131cdf0e10cSrcweir
132cdf0e10cSrcweir if( !bMustCopy &&
133cdf0e10cSrcweir src_width == dest_width &&
134cdf0e10cSrcweir src_height == dest_height )
135cdf0e10cSrcweir {
136cdf0e10cSrcweir // no scaling involved, can simply copy
137cdf0e10cSrcweir vigra::copyImage( s_begin, s_end, s_acc,
138cdf0e10cSrcweir d_begin, d_acc );
139cdf0e10cSrcweir return;
140cdf0e10cSrcweir }
141cdf0e10cSrcweir
142cdf0e10cSrcweir typedef vigra::BasicImage<typename SourceAcc::value_type> TmpImage;
143cdf0e10cSrcweir typedef typename TmpImage::traverser TmpImageIter;
144cdf0e10cSrcweir
145cdf0e10cSrcweir TmpImage tmp_image(src_width,
146cdf0e10cSrcweir dest_height);
147cdf0e10cSrcweir TmpImageIter t_begin = tmp_image.upperLeft();
148cdf0e10cSrcweir
149cdf0e10cSrcweir // scale in y direction
150cdf0e10cSrcweir for( int x=0; x<src_width; ++x, ++s_begin.x, ++t_begin.x )
151cdf0e10cSrcweir {
152cdf0e10cSrcweir typename SourceIter::column_iterator s_cbegin = s_begin.columnIterator();
153cdf0e10cSrcweir typename TmpImageIter::column_iterator t_cbegin = t_begin.columnIterator();
154cdf0e10cSrcweir
155cdf0e10cSrcweir scaleLine(s_cbegin, s_cbegin+src_height, s_acc,
156cdf0e10cSrcweir t_cbegin, t_cbegin+dest_height, tmp_image.accessor());
157cdf0e10cSrcweir }
158cdf0e10cSrcweir
159cdf0e10cSrcweir t_begin = tmp_image.upperLeft();
160cdf0e10cSrcweir
161cdf0e10cSrcweir // scale in x direction
162cdf0e10cSrcweir for( int y=0; y<dest_height; ++y, ++d_begin.y, ++t_begin.y )
163cdf0e10cSrcweir {
164cdf0e10cSrcweir typename DestIter::row_iterator d_rbegin = d_begin.rowIterator();
165cdf0e10cSrcweir typename TmpImageIter::row_iterator t_rbegin = t_begin.rowIterator();
166cdf0e10cSrcweir
167cdf0e10cSrcweir scaleLine(t_rbegin, t_rbegin+src_width, tmp_image.accessor(),
168cdf0e10cSrcweir d_rbegin, d_rbegin+dest_width, d_acc);
169cdf0e10cSrcweir }
170cdf0e10cSrcweir }
171cdf0e10cSrcweir
172cdf0e10cSrcweir /** Scale an image, range tuple version
173cdf0e10cSrcweir
174cdf0e10cSrcweir @param bMustCopy
175cdf0e10cSrcweir When true, scaleImage always copies source, even when doing 1:1
176cdf0e10cSrcweir copy
177cdf0e10cSrcweir */
178cdf0e10cSrcweir template< class SourceIter, class SourceAcc,
179cdf0e10cSrcweir class DestIter, class DestAcc >
scaleImage(vigra::triple<SourceIter,SourceIter,SourceAcc> const & src,vigra::triple<DestIter,DestIter,DestAcc> const & dst,bool bMustCopy=false)180cdf0e10cSrcweir inline void scaleImage( vigra::triple<SourceIter,SourceIter,SourceAcc> const& src,
181cdf0e10cSrcweir vigra::triple<DestIter,DestIter,DestAcc> const& dst,
182cdf0e10cSrcweir bool bMustCopy=false )
183cdf0e10cSrcweir {
184cdf0e10cSrcweir scaleImage(src.first,src.second,src.third,
185cdf0e10cSrcweir dst.first,dst.second,dst.third,
186cdf0e10cSrcweir bMustCopy);
187cdf0e10cSrcweir }
188cdf0e10cSrcweir
189cdf0e10cSrcweir }
190cdf0e10cSrcweir
191cdf0e10cSrcweir #endif /* INCLUDED_BASEBMP_SCALEIMAGE_HXX */
192