From 0098c4b571d55a63c7ebfd200f352b6d422aa159 Mon Sep 17 00:00:00 2001
From: AlexanderStohr <alexander.stohr@gmx.de>
Date: Tue, 13 Oct 2015 15:52:42 +0200
Subject: [PATCH] fix VS2010 error with type mismatch due to volatile qualifier

---
 modules/imgcodecs/src/grfmt_png.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/imgcodecs/src/grfmt_png.cpp b/modules/imgcodecs/src/grfmt_png.cpp
index 5a5f40bb9..2f4a62bae 100644
--- a/modules/imgcodecs/src/grfmt_png.cpp
+++ b/modules/imgcodecs/src/grfmt_png.cpp
@@ -368,7 +368,7 @@ bool  PngEncoder::write( const Mat& img, const std::vector<int>& params )
                 {
                     f = fopen( m_filename.c_str(), "wb" );
                     if( f )
-                        png_init_io( png_ptr, f );
+                        png_init_io( png_ptr, (png_FILE_p)f );
                 }
 
                 int compression_level = -1; // Invalid value to allow setting 0-9 as valid
@@ -437,7 +437,7 @@ bool  PngEncoder::write( const Mat& img, const std::vector<int>& params )
     }
 
     png_destroy_write_struct( &png_ptr, &info_ptr );
-    if(f) fclose( f );
+    if(f) fclose( (FILE*)f );
 
     return result;
 }