#opencv precompiled headers macro (can add pch to modules and tests)
#this macro must be called after any "add_definitions" commands, otherwise precompiled headers will not work
macro(add_opencv_precompiled_headers the_target)
    if(the_target MATCHES opencv_test_)
        SET(pch_name "test/test_precomp")
    else()
        SET(pch_name "src/precomp")
    endif()
    set(pch_header "${CMAKE_CURRENT_SOURCE_DIR}/${pch_name}.hpp")
    if(PCHSupport_FOUND AND USE_PRECOMPILED_HEADERS AND EXISTS "${pch_header}")
        if(CMAKE_GENERATOR MATCHES Visual)
            set(${the_target}_pch "${CMAKE_CURRENT_SOURCE_DIR}/${pch_name}.cpp")
            add_native_precompiled_header(${the_target} ${pch_header})
        elseif(CMAKE_GENERATOR MATCHES Xcode)
            add_native_precompiled_header(${the_target} ${pch_header})
        elseif(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_GENERATOR MATCHES Makefiles)
            add_precompiled_header(${the_target} ${pch_header})
        endif()
    endif()
endmacro()

# this is template for a OpenCV module 
macro(define_opencv_module name)
    
    project(opencv_${name})

    include_directories("${CMAKE_CURRENT_SOURCE_DIR}/include"
                        "${CMAKE_CURRENT_SOURCE_DIR}/src"
                        "${CMAKE_CURRENT_BINARY_DIR}")
    
    foreach(d ${ARGN})
        if(d MATCHES "opencv_")
            string(REPLACE "opencv_" "${CMAKE_CURRENT_SOURCE_DIR}/../" d_dir ${d})
            include_directories("${d_dir}/include")
        endif()
    endforeach()

    file(GLOB lib_srcs "src/*.cpp")
    file(GLOB lib_int_hdrs "src/*.h*")

    if(COMMAND get_module_external_sources)
       get_module_external_sources(${name})
    endif()

    source_group("Src" FILES ${lib_srcs} ${lib_int_hdrs})

    file(GLOB lib_hdrs "include/opencv2/${name}/*.h*")
    source_group("Include" FILES ${lib_hdrs})

    set(the_target "opencv_${name}")
    if (${name} MATCHES "ts" AND MINGW)
        add_library(${the_target} STATIC ${lib_srcs} ${lib_hdrs} ${lib_int_hdrs})
    else()
        add_library(${the_target} ${lib_srcs} ${lib_hdrs} ${lib_int_hdrs})
    endif()

    # For dynamic link numbering convenions
    if(NOT ANDROID)
        # Android SDK build scripts can include only .so files into final .apk
        # As result we should not set version properties for Android
        set_target_properties(${the_target} PROPERTIES
            VERSION ${OPENCV_VERSION}
            SOVERSION ${OPENCV_SOVERSION}
            )
    endif()

    set_target_properties(${the_target} PROPERTIES OUTPUT_NAME "${the_target}${OPENCV_DLLVERSION}" )    

    if(ENABLE_SOLUTION_FOLDERS)
        set_target_properties(${the_target} PROPERTIES FOLDER "modules")
    endif() 
        
    if (BUILD_SHARED_LIBS)
        if(MSVC)
            set_target_properties(${the_target} PROPERTIES DEFINE_SYMBOL CVAPI_EXPORTS)
        else()
            add_definitions(-DCVAPI_EXPORTS)        
        endif()
    endif()

    # Additional target properties
    set_target_properties(${the_target} PROPERTIES
        DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
        ARCHIVE_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH}
        RUNTIME_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH}
        INSTALL_NAME_DIR lib
        )

    add_opencv_precompiled_headers(${the_target})

    # Add the required libraries for linking:
    target_link_libraries(${the_target} ${OPENCV_LINKER_LIBS} ${IPP_LIBS} ${ARGN})

    if(MSVC)
        if(CMAKE_CROSSCOMPILING)
            set_target_properties(${the_target} PROPERTIES
                LINK_FLAGS "/NODEFAULTLIB:secchk"
                )
        endif()
        set_target_properties(${the_target} PROPERTIES
            LINK_FLAGS "/NODEFAULTLIB:libc /DEBUG"
            )
    endif()

    # Dependencies of this target:
    add_dependencies(${the_target} ${ARGN})

    install(TARGETS ${the_target}
        RUNTIME DESTINATION bin COMPONENT main
        LIBRARY DESTINATION ${OPENCV_LIB_INSTALL_PATH} COMPONENT main
        ARCHIVE DESTINATION ${OPENCV_LIB_INSTALL_PATH} COMPONENT main)

    install(FILES ${lib_hdrs}
        DESTINATION ${OPENCV_INCLUDE_PREFIX}/opencv2/${name}
        COMPONENT main)
        
    if(BUILD_TESTS AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/test)
        include_directories("${CMAKE_CURRENT_SOURCE_DIR}/include"
                            "${CMAKE_CURRENT_SOURCE_DIR}/test"
                            "${CMAKE_CURRENT_BINARY_DIR}")

        set(test_deps opencv_${name} ${ARGN} opencv_ts opencv_highgui ${EXTRA_${the_target}_DEPS})
        foreach(d ${test_deps})
            if(d MATCHES "opencv_")
                string(REPLACE "opencv_" "${CMAKE_CURRENT_SOURCE_DIR}/../" d_dir ${d})
                include_directories("${d_dir}/include")
            endif()
        endforeach()

        file(GLOB test_srcs "test/*.cpp")
        file(GLOB test_hdrs "test/*.h*")
        
        source_group("Src" FILES ${test_srcs})
        source_group("Include" FILES ${test_hdrs})

        set(the_target "opencv_test_${name}")

        add_executable(${the_target} ${test_srcs} ${test_hdrs})

        add_opencv_precompiled_headers(${the_target})

        # Additional target properties
        set_target_properties(${the_target} PROPERTIES
            DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
            RUNTIME_OUTPUT_DIRECTORY "${EXECUTABLE_OUTPUT_PATH}"
            )

        if(ENABLE_SOLUTION_FOLDERS)
            set_target_properties(${the_target} PROPERTIES FOLDER "tests")
        endif() 

        add_dependencies(${the_target} ${test_deps})

        # Add the required libraries for linking:
        target_link_libraries(${the_target} ${OPENCV_LINKER_LIBS} ${test_deps})

        enable_testing()
        get_target_property(LOC ${the_target} LOCATION)
        add_test(${the_target} "${LOC}")

        #if(WIN32)
        #    install(TARGETS ${the_target} RUNTIME DESTINATION bin COMPONENT main)
        #endif()
    endif()    

endmacro()