CMakeLists.txt

cmake_minimum_required(VERSION 3.16)

project(CIL
       VERSION 0.1.0
       LANGUAGES C CXX
       DESCRIPTION "C++ Image Library")

find_package(PkgConfig REQUIRED)

option(LIBPNG_DIR "Path to libpng installation directory")
option(LIBJPEG_DIR "Path to libjpeg installation directory")
STRING(CONCAT libjpeg_turbo_option_message "Path to libjpeg-turbo installation directory."
                                           "If both libjpeg and libjpeg-turbo are found"
                                           "libjpeg-turbo will be used")
option(LIBJPEG_TURBO_DIR libjpeg_turbo_option_message)
STRING(CONCAT catch2_dir_help "Path to catch2 installation directory, required"
                              "when catch2 is installed in a non-default location")
option(CATCH2_DIR catch2_dir_help)
option(CIL_BUILD_EXAMPLES "Specify if examples should be added and built")
option(CIL_BUILD_TESTS "Build tests as part of the 'all' build target. Default to Off")

if(DEFINED ENV{PKG_CONFIG_PATH})
    set(pkg_config_path $ENV{PKG_CONFIG_PATH})
    string(REPLACE ":" ";" prefix_paths ${pkg_config_path})
    list(APPEND CMAKE_PREFIX_PATH ${prefix_paths})
endif()

if(LIBPNG_DIR)
    list(PREPEND CMAKE_PREFIX_PATH ${LIBPNG_DIR})
endif()

if(LIBJPEG_DIR)
    list(PREPEND CMAKE_PREFIX_PATH ${LIBJPEG_DIR})
endif()

if(LIBJPEG_TURBO_DIR)
    list(PREPEND CMAKE_PREFIX_PATH ${LIBJPEG_TURBO_DIR})
endif()

if(CATCH2_DIR)
    list(PREPEND CMAKE_PREFIX_PATH ${CATCH2_DIR})
endif()

pkg_check_modules(LIBPNG libpng=1.6.37)
if(LIBPNG_FOUND)
    set(CIL_ENABLE_PNG true)
    string(CONCAT libpng_found_message "Libpng ${LIBPNG_VERSION} will "
           "be used to add PNG support to the project.")
    message(STATUS ${libpng_found_message})
else()
    set(CIL_ENABLE_PNG false)
    if (LIBPNG_DIR)
        string(CONCAT libpng_not_found_warning "Libpng pkg config file not found. "
               "Project is being configured to be built without the PNG support.")
        message(WARNING ${libpng_not_found_warning})
    endif()
endif()

pkg_check_modules(LIBJPEG_TURBO libturbojpeg>=2.1.1)
if (NOT LIBJPEG_TURBO_FOUND)
    pkg_check_modules(LIBJPEG libjpeg>=9.4.0)
else()
    pkg_check_modules(LIBJPEG libjpeg>=2.1.1)
endif()

set(ACTIVE_JPEG_LIB "")
if(LIBJPEG_TURBO_FOUND)
    set(CIL_ENABLE_JPEG true)
    set(ACTIVE_JPEG_LIB "LIBJPEG")
    string(CONCAT libjpeg_turbo_use_message "Libjpeg-turbo ${LIBJPEG_TURBO_VERSION} will "
                                            "be used to add JPEG support to the project.")
    message(STATUS ${libjpeg_turbo_use_message})
elseif(LIBJPEG_FOUND)
    set(CIL_ENABLE_JPEG true)
    set(ACTIVE_JPEG_LIB "LIBJPEG")
    string(CONCAT libjpeg_found_message "Libjpeg ${LIBJPEG_VERSION} will "
           "be used to add JPEG support to the project.")
    message(STATUS ${libjpeg_found_message})
else()
    if (LIBJPEG_DIR OR LIBJPEG_TURBO_DIR)
        set(CIL_ENABLE_JPEG false)
        string(CONCAT jpeg_lib_not_found_warning "Libjpeg pkg config file not found. "
               "Project is being configured to be built without the JPEG support.")
        message(WARNING ${jpeg_lib_not_found_warning})
    endif()
endif()

if(MSVC)
  add_compile_options(/W4 /WX)
else()
  add_compile_options(-Wall -Wextra -Wpedantic -Werror)
endif()

add_subdirectory(lib)
add_subdirectory(tools)

if(CIL_BUILD_EXAMPLES)
    add_subdirectory(examples)
endif()

if(CIL_BUILD_TESTS)
    pkg_check_modules(CATCH2 catch2>=2.13.5)
    if (CATCH2_FOUND)
        message(STATUS "Catch2 ${CATCH2_VERSION} will be used to build tests for the project.")
        include(CTest)
        enable_testing()
        add_subdirectory(tests)
    else()
        message(WARNING "Catch2 not found. Tests cannot be built without Catch2. Skipping tests.")
    endif()
endif()

install(DIRECTORY include/ TYPE INCLUDE)