1 files changed, 92 insertions, 0 deletions
diff --git a/boost/gil/extension/io/bmp/detail/is_allowed.hpp b/boost/gil/extension/io/bmp/detail/is_allowed.hpp
new file mode 100644
index 0000000000..fab24d58d7
--- /dev/null
+++ b/boost/gil/extension/io/bmp/detail/is_allowed.hpp
@@ -0,0 +1,92 @@
+/*
+    Copyright 2009 Christian Henning
+    Use, modification and distribution are subject to the Boost Software License,
+    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+    http://www.boost.org/LICENSE_1_0.txt).
+*/
+
+/*************************************************************************************************/
+
+#ifndef BOOST_GIL_EXTENSION_IO_BMP_DETAIL_IS_ALLOWED_HPP
+#define BOOST_GIL_EXTENSION_IO_BMP_DETAIL_IS_ALLOWED_HPP
+
+////////////////////////////////////////////////////////////////////////////////////////
+/// \file
+/// \brief
+/// \author Christian Henning \n
+///
+/// \date 2008 \n
+///
+////////////////////////////////////////////////////////////////////////////////////////
+
+namespace boost { namespace gil { namespace detail {
+
+template< typename View >
+bool is_allowed( const image_read_info< bmp_tag >& info
+               , mpl::true_   // is read_and_no_convert
+               )
+{
+    bmp_bits_per_pixel::type src_bits_per_pixel = 0;
+
+    switch( info._bits_per_pixel )
+    {
+        case 1:
+        case 4:
+        case 8:
+        {
+            if(  info._header_size == bmp_header_size::_win32_info_size
+              && info._compression != bmp_compression::_rle8
+              && info._compression != bmp_compression::_rle4
+              )
+            {
+                src_bits_per_pixel = 32;
+            }
+            else
+            {
+                src_bits_per_pixel = 24;
+            }
+
+            break;
+        }
+
+        case 15:
+        case 16:
+        {
+            src_bits_per_pixel = 24;
+
+            break;
+        }
+
+        case 24:
+        case 32:
+        {
+            src_bits_per_pixel = info._bits_per_pixel;
+
+            break;
+        }
+        default:
+        {
+            io_error( "Pixel size not supported." );
+        }
+    }
+
+    typedef typename channel_traits< typename element_type< typename View::value_type >::type >::value_type channel_t;
+    bmp_bits_per_pixel::type dst_bits_per_pixel = detail::unsigned_integral_num_bits< channel_t >::value
+                                                * num_channels< View >::value;
+
+    return ( dst_bits_per_pixel == src_bits_per_pixel );
+}
+
+template< typename View >
+bool is_allowed( const image_read_info< bmp_tag >& /* info */
+               , mpl::false_  // is read_and_convert
+               )
+{
+    return true;
+}
+
+} // namespace detail
+} // namespace gil
+} // namespace boost
+
+#endif