PvAPI support on Windows with MinGW (PR #1038 applied to the branch 2.4)

cmake/OpenCVFindLibsVideo.cmake

@@ -58,7 +58,14 @@ if(WITH_PVAPI)
       set(_PVAPI_LIBRARY "${_PVAPI_LIBRARY}/${CMAKE_OPENCV_GCC_VERSION_MAJOR}.${CMAKE_OPENCV_GCC_VERSION_MINOR}")
     endif()
 
-    set(PVAPI_LIBRARY "${_PVAPI_LIBRARY}/${CMAKE_STATIC_LIBRARY_PREFIX}PvAPI${CMAKE_STATIC_LIBRARY_SUFFIX}" CACHE PATH "The PvAPI library")
+    if(WIN32)
+      if(MINGW)
+        set(PVAPI_DECLARATIONS "-DPVDECL=__stdcall")
+      endif(MINGW)
+      set(PVAPI_LIBRARY "${_PVAPI_LIBRARY}/PvAPI.lib" CACHE PATH "The PvAPI library")
+    else(WIN32)
+      set(PVAPI_LIBRARY "${_PVAPI_LIBRARY}/${CMAKE_STATIC_LIBRARY_PREFIX}PvAPI${CMAKE_STATIC_LIBRARY_SUFFIX}" CACHE PATH "The PvAPI library")
+    endif(WIN32)
     if(EXISTS "${PVAPI_LIBRARY}")
       set(HAVE_PVAPI TRUE)
     endif()

modules/highgui/CMakeLists.txt

@@ -197,6 +197,7 @@ endif(HAVE_FFMPEG)
 
 if(HAVE_PVAPI)
   add_definitions(-DHAVE_PVAPI)
+  add_definitions(${PVAPI_DECLARATIONS})
   ocv_include_directories(${PVAPI_INCLUDE_PATH})
   set(highgui_srcs src/cap_pvapi.cpp ${highgui_srcs})
   list(APPEND HIGHGUI_LIBRARIES ${PVAPI_LIBRARY})