cmake/modules/FindLibpng.cmake

include(LibFindMacros)
libfind_pkg_check_modules(LIBPNG_PKGCONF libpng)

find_path(LIBPNG_INCLUDE_DIR
    NAMES png.h
    HINTS ${LIBPNG_PKGCONF_INCLUDE_DIRS} ${LIBPNG_PKGCONF_INCLUDEDIR}
    PATH_SUFFIXES LIBPNG
)

find_library(LIBPNG_LIBRARY
    NAMES libpng png
    HINTS ${LIBPNG_PKGCONF_LIBRARY_DIRS} ${LIBPNG_PKGCONF_LIBDIR}
)

libfind_process(LIBPNG)

set(LIBPNG_LINK_LIBRARIES ${LIBPNG_LIBRARY})
set(LIBPNG_INCLUDE_DIRS ${LIBPNG_INCLUDE_DIR})

#message(STATUS "xxx  LIBPNG_LIBRARY = ${LIBPNG_LIBRARY}")
#message(STATUS "xxx  LIBPNG_INCLUDE_DIR = ${LIBPNG_INCLUDE_DIR}")
#message(STATUS "xxx  LIBPNG_LINK_LIBRARIES = ${LIBPNG_LINK_LIBRARIES}")
#message(STATUS "xxx  LIBPNG_INCLUDE_DIRS = ${LIBPNG_INCLUDE_DIRS}")


include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(LIBPNG
    REQUIRED_VARS
        LIBPNG_INCLUDE_DIR
        LIBPNG_LIBRARIES
)