Fix ENABLE_GRAY_ALPHA macro name to BOOST_GIL_IO_ENABLE_GRAY_ALPHA

boostorg · Jul 17, 2019 · 69adf0e · 69adf0e
1 parent 8234329
commit 69adf0e
Show file tree

Hide file tree

Showing 2 changed files with 3 additions and 4 deletions.
diff --git a/doc/io.rst b/doc/io.rst
@@ -434,9 +434,8 @@ Currently the code is able to read and write the following image types:
 :Read: gray1, gray2, gray4, gray8, gray16, gray_alpha_8, gray_alpha_16, rgb8, rgb16, rgba8, rgba16
 :Write: gray1, gray2, gray4, gray8, gray16, gray_alpha_8, gray_alpha_16, rgb8, rgb16, rgba8, rgba16
 
-For reading gray_alpha images the user has to enable the ``ENABLE_GRAY_ALPHA``
-compiler switch. This color space is defined in the toolbox by
-using ``gray_alpha.hpp``.
+For reading gray_alpha images the user has to compile application with ``BOOST_GIL_IO_ENABLE_GRAY_ALPHA``
+macro  defined. This color space is defined in the toolbox by using ``gray_alpha.hpp``.
 
 PNM
 +++

diff --git a/include/boost/gil/extension/io/png/detail/read.hpp b/include/boost/gil/extension/io/png/detail/read.hpp
@@ -186,7 +186,7 @@ class reader< Device
                     default: io_error( "png_reader::read_data(): unknown combination of color type and bit depth" );
                 }
                 #else
-                    io_error( "gray_alpha isn't enabled. Use ENABLE_GRAY_ALPHA when building application." );
+                    io_error( "gray_alpha isn't enabled. Define BOOST_GIL_IO_ENABLE_GRAY_ALPHA when building application." );
                 #endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA