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ppm23.cc
1 // Copyright (C) 2007, 2008, 2009, 2010 EPITA Research and Development
2 // Laboratory (LRDE)
3 //
4 // This file is part of Olena.
5 //
6 // Olena is free software: you can redistribute it and/or modify it under
7 // the terms of the GNU General Public License as published by the Free
8 // Software Foundation, version 2 of the License.
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13 // General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with Olena. If not, see <http://www.gnu.org/licenses/>.
17 //
18 // As a special exception, you may use this file as part of a free
19 // software project without restriction. Specifically, if other files
20 // instantiate templates or use macros or inline functions from this
21 // file, or you compile this file and link it with other files to produce
22 // an executable, this file does not by itself cause the resulting
23 // executable to be covered by the GNU General Public License. This
24 // exception does not however invalidate any other reasons why the
25 // executable file might be covered by the GNU General Public License.
26 
27 #include <mln/core/image/image2d.hh>
28 #include <mln/win/rectangle2d.hh>
29 
30 #include <mln/value/rgb8.hh>
31 
32 #include <mln/io/ppm/load.hh>
33 #include <mln/io/ppm/save.hh>
34 
35 #include <mln/data/compare.hh>
36 
37 #include "tests/data.hh"
38 
39 
40 using namespace mln;
41 
42 typedef value::rgb<23> rgb23;
43 
44 struct to23bits : mln::Function_v2v<to23bits>
45 {
46 
47  typedef rgb23 result;
48  result operator()(value::rgb8 v) const
49  {
50  result ret(v.red().to_enc() * 256,
51  v.green().to_enc() * 256,
52  v.blue().to_enc() * 256);
53  return ret;
54  }
55 };
56 
57 struct to8bits : mln::Function_v2v<to8bits>
58 {
59 
60  typedef value::rgb8 result;
61  result operator()(rgb23 v) const
62  {
63  result ret(v.red().to_enc() / 256,
64  v.green().to_enc() / 256,
65  v.blue().to_enc() / 256);
66  return ret;
67  }
68 };
69 
70 int main()
71 {
72  using namespace mln;
73  using value::rgb8;
74 
75  typedef image2d<rgb8> I;
76 
77 
78  // load a 8-bit image A
79  image2d<rgb8> a = io::ppm::load<rgb8>(MLN_IMG_DIR "/lena.ppm");
80  image2d<rgb23> b(a.domain());
81 
82  image2d<rgb8>::fwd_piter p(b.domain());
83 
84  // save it as a 23-bit ppm image B
85  to23bits f;
86  for_all(p)
87  b(p) = f(a(p));
88  io::ppm::save(b, "ppm23-out23.ppm");
89 
90  // reload B into C
91  image2d<rgb23>
92  c = io::ppm::load<rgb23>("ppm23-out23.ppm");
93  image2d<rgb8> d(a.domain());
94 
95 
96  // save C as a 8-bit ppm image D
97  to8bits g;
98  for_all(p)
99  d(p) = g(c(p));
100  io::ppm::save(d, "ppm23-out8.ppm");
101 
102  // D shall equal A
103  mln_assertion(d == a);
104 
105 }