ceph/src/boost/boost/gil/extension/io/jpeg/detail/is_allowed.hpp

   1 //
   2 // Copyright 2009 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_JPEG_DETAIL_IS_ALLOWED_HPP
   9 #define BOOST_GIL_EXTENSION_IO_JPEG_DETAIL_IS_ALLOWED_HPP
  10
  11 #include <boost/gil/extension/io/jpeg/tags.hpp>
  12
  13 #include <type_traits>
  14
  15 namespace boost { namespace gil { namespace detail {
  16
  17 template< typename View >
  18 bool is_allowed( const image_read_info< jpeg_tag >& info
  19                , std::true_type   // is read_and_no_convert
  20                )
  21 {
  22     if( info._color_space == JCS_YCbCr )
  23     {
  24         // We read JCS_YCbCr files as rgb.
  25         return ( is_read_supported< typename View::value_type
  26                                   , jpeg_tag
  27                                   >::_color_space == JCS_RGB );
  28     }
  29
  30     return ( is_read_supported< typename View::value_type
  31                               , jpeg_tag
  32                               >::_color_space == info._color_space );
  33 }
  34
  35 template< typename View >
  36 bool is_allowed( const image_read_info< jpeg_tag >& /* info */
  37                , std::false_type  // is read_and_convert
  38                )
  39 {
  40     return true;
  41 }
  42
  43 } // namespace detail
  44 } // namespace gil
  45 } // namespace boost
  46
  47 #endif