From 179a28644793852c1a2dad5108317cb9ebd9682d Mon Sep 17 00:00:00 2001
From: Christian Henning <chhenning@gmail.com>
Date: Sat, 22 Jun 2013 20:34:18 +0000
Subject: [PATCH] Added compiler symbol to allow compiling with libpng 1.4 or
 lower.

[SVN r84883]
---
 include/boost/gil/extension/io/formats/png/reader_backend.hpp | 3 +++
 include/boost/gil/extension/io/formats/png/writer_backend.hpp | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/boost/gil/extension/io/formats/png/reader_backend.hpp b/include/boost/gil/extension/io/formats/png/reader_backend.hpp
index 8cde5bbdf..b39be44b1 100644
--- a/include/boost/gil/extension/io/formats/png/reader_backend.hpp
+++ b/include/boost/gil/extension/io/formats/png/reader_backend.hpp
@@ -476,6 +476,8 @@ public:
             }
         }
 
+#ifndef BOOST_GIL_IO_PNG_1_4_OR_LOWER
+
 #ifdef BOOST_GIL_IO_PNG_FLOATING_POINT_SUPPORTED
 
         // get physical scale settings
@@ -530,6 +532,7 @@ public:
         }
 #endif // BOOST_GIL_IO_PNG_FIXED_POINT_SUPPORTED
 #endif // BOOST_GIL_IO_PNG_FLOATING_POINT_SUPPORTED
+#endif // BOOST_GIL_IO_PNG_1_4_OR_LOWER
 
         // get comments information from png_info structure
         if( this->_settings._read_comments )
diff --git a/include/boost/gil/extension/io/formats/png/writer_backend.hpp b/include/boost/gil/extension/io/formats/png/writer_backend.hpp
index 7bddde9c7..6d7a46332 100644
--- a/include/boost/gil/extension/io/formats/png/writer_backend.hpp
+++ b/include/boost/gil/extension/io/formats/png/writer_backend.hpp
@@ -286,6 +286,8 @@ protected:
                         );
         }
 
+#ifndef BOOST_GIL_IO_PNG_1_4_OR_LOWER
+
 #ifdef BOOST_GIL_IO_PNG_FLOATING_POINT_SUPPORTED 
         if( _info._valid_scale_factors )
         {
@@ -320,7 +322,7 @@ protected:
 
 #endif // BOOST_GIL_IO_PNG_FIXED_POINT_SUPPORTED
 #endif // BOOST_GIL_IO_PNG_FLOATING_POINT_SUPPORTED
-
+#endif // BOOST_GIL_IO_PNG_1_4_OR_LOWER
 
         if( _info._valid_text )
         {