boost/gil/extension/io/targa/detail/supported_types.hpp

   1 //
   2 // Copyright 2010 Kenneth Riddile
   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_TARGA_DETAIL_SUPPORTED_TYPES_HPP
   9 #define BOOST_GIL_EXTENSION_IO_TARGA_DETAIL_SUPPORTED_TYPES_HPP
  10
  11 #include <boost/gil/extension/io/targa/tags.hpp>
  12
  13 #include <boost/gil/channel.hpp>
  14 #include <boost/gil/color_base.hpp>
  15 #include <boost/gil/io/base.hpp>
  16
  17 #include <type_traits>
  18
  19 namespace boost { namespace gil { namespace detail {
  20
  21 // Read support
  22
  23 template< typename Channel
  24         , typename ColorSpace
  25         >
  26 struct targa_read_support : read_support_false
  27 {
  28     static const targa_depth::type bpp = 0;
  29 };
  30
  31 template<>
  32 struct targa_read_support<uint8_t
  33                          , rgb_t
  34                          > : read_support_true
  35 {
  36     static const targa_depth::type bpp = 24;
  37 };
  38
  39
  40 template<>
  41 struct targa_read_support<uint8_t
  42                          , rgba_t
  43                          > : read_support_true
  44 {
  45     static const targa_depth::type bpp = 32;
  46 };
  47
  48
  49 // Write support
  50
  51 template< typename Channel
  52         , typename ColorSpace
  53         >
  54 struct targa_write_support : write_support_false
  55 {};
  56
  57 template<>
  58 struct targa_write_support<uint8_t
  59                           , rgb_t
  60                           > : write_support_true {};
  61
  62 template<>
  63 struct targa_write_support<uint8_t
  64                           , rgba_t
  65                           > : write_support_true {};
  66
  67 } // namespace detail
  68
  69 template<typename Pixel>
  70 struct is_read_supported<Pixel, targa_tag>
  71     : std::integral_constant
  72         <
  73             bool,
  74             detail::targa_read_support
  75             <
  76                 typename channel_type<Pixel>::type,
  77                 typename color_space_type<Pixel>::type
  78             >::is_supported
  79         >
  80 {
  81     using parent_t = detail::targa_read_support
  82         <
  83             typename channel_type<Pixel>::type,
  84             typename color_space_type<Pixel>::type
  85         >;
  86
  87     static const typename targa_depth::type bpp = parent_t::bpp;
  88 };
  89
  90 template<typename Pixel>
  91 struct is_write_supported<Pixel, targa_tag>
  92     : std::integral_constant
  93         <
  94             bool,
  95             detail::targa_write_support
  96             <
  97                 typename channel_type<Pixel>::type,
  98                 typename color_space_type<Pixel>::type
  99             >::is_supported
 100         >
 101 {};
 102
 103 }} // namespace boost::gil
 104
 105 #endif