boost/gil/extension/io/tiff/detail/writer_backend.hpp

   1 //
   2 // Copyright 2012 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_EXTENSION_IO_TIFF_DETAIL_WRITER_BACKEND_HPP
   9 #define BOOST_GIL_EXTENSION_IO_TIFF_DETAIL_WRITER_BACKEND_HPP
  10
  11 #include <boost/gil/extension/io/tiff/tags.hpp>
  12 #include <boost/gil/extension/io/tiff/detail/device.hpp>
  13
  14 #include <boost/gil/detail/mp11.hpp>
  15
  16 namespace boost { namespace gil {
  17
  18 #if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
  19 #pragma warning(push)
  20 #pragma warning(disable:4512) //assignment operator could not be generated
  21 #endif
  22
  23 ///
  24 /// TIFF Writer Backend
  25 ///
  26 template< typename Device >
  27 struct writer_backend< Device
  28                      , tiff_tag
  29                      >
  30 {
  31 public:
  32
  33     using format_tag_t = tiff_tag;
  34
  35 public:
  36
  37     writer_backend( const Device&                       io_dev
  38                   , const image_write_info< tiff_tag >& info
  39                   )
  40     : _io_dev( io_dev )
  41     , _info( info )
  42     {}
  43
  44 protected:
  45
  46     template< typename View >
  47     void write_header( const View& view )
  48     {
  49         using pixel_t = typename View::value_type;
  50
  51         // get the type of the first channel (heterogeneous pixels might be broken for now!)
  52         using channel_t = typename channel_traits<typename element_type<pixel_t>::type>::value_type;
  53                                 using color_space_t = typename color_space_type<View>::type;
  54
  55         if(! this->_info._photometric_interpretation_user_defined )
  56         {
  57             // write photometric interpretion - Warning: This value is rather
  58             // subjective. The user should better set this value itself. There
  59             // is no way to decide if a image is PHOTOMETRIC_MINISWHITE or
  60             // PHOTOMETRIC_MINISBLACK. If the user has not manually set it, then
  61             // this writer will assume PHOTOMETRIC_MINISBLACK for gray_t images,
  62             // PHOTOMETRIC_RGB for rgb_t images, and PHOTOMETRIC_SEPARATED (as
  63             // is conventional) for cmyk_t images.
  64             this->_info._photometric_interpretation = detail::photometric_interpretation< color_space_t >::value;
  65         }
  66
  67         // write dimensions
  68         tiff_image_width::type  width  = (tiff_image_width::type)  view.width();
  69         tiff_image_height::type height = (tiff_image_height::type) view.height();
  70
  71         this->_io_dev.template set_property< tiff_image_width  >( width  );
  72         this->_io_dev.template set_property< tiff_image_height >( height );
  73
  74         // write planar configuration
  75         this->_io_dev.template set_property<tiff_planar_configuration>( this->_info._planar_configuration );
  76
  77         // write samples per pixel
  78         tiff_samples_per_pixel::type samples_per_pixel = num_channels< pixel_t >::value;
  79         this->_io_dev.template set_property<tiff_samples_per_pixel>( samples_per_pixel );
  80
  81         if /*constexpr*/ (mp11::mp_contains<color_space_t, alpha_t>::value)
  82         {
  83           std:: vector <uint16_t> extra_samples {EXTRASAMPLE_ASSOCALPHA};
  84           this->_io_dev.template set_property<tiff_extra_samples>( extra_samples );
  85         }
  86
  87         // write bits per sample
  88         // @todo: Settings this value usually requires to write for each sample the bit
  89         // value seperately in case they are different, like rgb556.
  90         tiff_bits_per_sample::type bits_per_sample = detail::unsigned_integral_num_bits< channel_t >::value;
  91         this->_io_dev.template set_property<tiff_bits_per_sample>( bits_per_sample );
  92
  93         // write sample format
  94         tiff_sample_format::type sampl_format = detail::sample_format< channel_t >::value;
  95         this->_io_dev.template set_property<tiff_sample_format>( sampl_format );
  96
  97         // write photometric format
  98         this->_io_dev.template set_property<tiff_photometric_interpretation>( this->_info._photometric_interpretation );
  99
 100         // write compression
 101         this->_io_dev.template set_property<tiff_compression>( this->_info._compression );
 102
 103         // write orientation
 104         this->_io_dev.template set_property<tiff_orientation>( this->_info._orientation );
 105
 106         // write rows per strip
 107         this->_io_dev.template set_property<tiff_rows_per_strip>( this->_io_dev.get_default_strip_size() );
 108
 109         // write x, y resolution and units
 110         this->_io_dev.template set_property<tiff_resolution_unit>( this->_info._resolution_unit );
 111         this->_io_dev.template set_property<tiff_x_resolution>( this->_info._x_resolution );
 112         this->_io_dev.template set_property<tiff_y_resolution>( this->_info._y_resolution );
 113
 114         /// Optional and / or non-baseline tags below here
 115
 116         // write ICC colour profile, if it's there
 117         // http://www.color.org/icc_specs2.xalter
 118         if ( 0 != this->_info._icc_profile.size())
 119           this->_io_dev.template set_property<tiff_icc_profile>( this->_info._icc_profile );
 120     }
 121
 122
 123 public:
 124
 125     Device _io_dev;
 126
 127     image_write_info< tiff_tag > _info;
 128 };
 129
 130 #if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
 131 #pragma warning(pop)
 132 #endif
 133
 134 } // namespace gil
 135 } // namespace boost
 136
 137 #endif