removed unnecessary #include "windows.h" from "highgui_c.h"

modules/highgui/include/opencv2/highgui/highgui_c.h

@@ -43,11 +43,6 @@
 #define __OPENCV_HIGHGUI_H__
 
 #include "opencv2/core/core_c.h"
-#if defined WIN32 || defined _WIN32
-   	#include <windows.h>
-	#undef min
-	#undef max
-#endif
 
 #ifdef __cplusplus
 extern "C" {
@@ -462,9 +457,10 @@ CVAPI(void) cvReleaseVideoWriter( CvVideoWriter** writer );
 
 #if defined WIN32 || defined _WIN32
 
-typedef int (CV_CDECL * CvWin32WindowCallback)(HWND, UINT, WPARAM, LPARAM, int*);
-CVAPI(void) cvSetPreprocessFuncWin32( CvWin32WindowCallback on_preprocess );
-CVAPI(void) cvSetPostprocessFuncWin32( CvWin32WindowCallback on_postprocess );
+CVAPI(void) cvSetPreprocessFuncWin32_(const void* callback);
+CVAPI(void) cvSetPostprocessFuncWin32_(const void* callback);
+#define cvSetPreprocessFuncWin32(callback) cvSetPreprocessFuncWin32_((const void*)(callback))
+#define cvSetPostprocessFuncWin32(callback) cvSetPostprocessFuncWin32_((const void*)(callback))
 
 #endif
 

modules/highgui/src/precomp.hpp

@@ -60,6 +60,12 @@
 
 #include "cvconfig.h"
 #if defined WIN32 || defined _WIN32
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef min
+#undef max
+
 void  FillBitmapInfo( BITMAPINFO* bmi, int width, int height, int bpp, int origin );
 #endif
 

modules/highgui/src/window_w32.cpp

@@ -1671,23 +1671,18 @@ CV_IMPL const char* cvGetWindowName( void* window_handle )
 }
 
 
+typedef int (CV_CDECL * CvWin32WindowCallback)(HWND, UINT, WPARAM, LPARAM, int*);
 
 CV_IMPL void
-cvSetPreprocessFuncWin32(int (__cdecl *on_preprocess)(HWND, UINT, WPARAM, LPARAM, int*))
+cvSetPreprocessFuncWin32_(const void* callback)
 {
-    if(on_preprocess)
-        hg_on_preprocess = on_preprocess;
-    else
-        assert(on_preprocess);
+    hg_on_preprocess = (CvWin32WindowCallback)callback;
 }
 
 CV_IMPL void
-cvSetPostprocessFuncWin32(int (__cdecl *on_postprocess)(HWND, UINT, WPARAM, LPARAM, int*))
+cvSetPostprocessFuncWin32_(const void* callback)
 {
-    if(on_postprocess)
-        hg_on_postprocess = on_postprocess;
-    else
-        assert(on_postprocess);
+    hg_on_postprocess = (CvWin32WindowCallback)callback;
 }
 
 #endif //WIN32