libs/gil/test/extension/io/scanline_read_test.hpp

   1 //
   2 // Copyright 2013 Christian Henning
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 #ifndef BOOST_GIL_IO_TEST_SCANLINE_READ_TEST_HPP
   9 #define BOOST_GIL_IO_TEST_SCANLINE_READ_TEST_HPP
  10
  11 #include <boost/gil.hpp>
  12
  13 #include "cmp_view.hpp"
  14
  15 template< typename Image
  16         , typename FormatTag
  17         >
  18 void test_scanline_reader( const char* file_name )
  19 {
  20     using namespace boost::gil;
  21
  22     // read image using scanline_read_iterator
  23     using reader_t = scanline_reader
  24         <
  25             typename get_read_device<char const*, FormatTag>::type,
  26             FormatTag
  27         >;
  28
  29     reader_t reader = make_scanline_reader( file_name, FormatTag() );
  30
  31     Image dst( reader._info._width, reader._info._height );
  32
  33     using iterator_t = typename reader_t::iterator_t;
  34
  35     iterator_t it  = reader.begin();
  36     iterator_t end = reader.end();
  37
  38     for( int row = 0; it != end; ++it, ++row )
  39     {
  40         copy_pixels( interleaved_view( reader._info._width
  41                                      , 1
  42                                      , ( typename Image::view_t::x_iterator ) *it
  43                                      , reader._scanline_length
  44                                      )
  45                    , subimage_view( view( dst )
  46                                   , 0
  47                                   , row
  48                                   , reader._info._width
  49                                   , 1
  50                                   )
  51                    );
  52     }
  53
  54     //compare
  55     Image img;
  56     read_image( file_name, img, FormatTag() );
  57
  58     cmp_view( view( dst ), view( img ) );
  59 }
  60
  61 #endif // BOOST_GIL_IO_TEST_SCANLINE_READ_TEST_HPP