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# - Find the native PNG includes and library
#
# This module defines
# PNG_INCLUDE_DIR, where to find png.h, etc.
# PNG_LIBRARIES, the libraries to link against to use PNG.
# PNG_DEFINITIONS - You should ADD_DEFINITONS(${PNG_DEFINITIONS}) before compiling code that includes png library files.
# PNG_FOUND, If false, do not try to use PNG.
# also defined, but not for general use are
# PNG_LIBRARY, where to find the PNG library.
# None of the above will be defined unles zlib can be found.
# PNG depends on Zlib
INCLUDE(FindZLIB)
SET(PNG_FOUND "NO")
IF(ZLIB_FOUND)
FIND_PATH(PNG_PNG_INCLUDE_DIR png.h
/usr/local/include
/usr/include
/usr/local/include/libpng # OpenBSD
)
SET(PNG_NAMES ${PNG_NAMES} png libpng)
FIND_LIBRARY(PNG_LIBRARY
NAMES ${PNG_NAMES}
PATHS /usr/lib /usr/local/lib
)
IF (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR)
# png.h includes zlib.h. Sigh.
SET(PNG_INCLUDE_DIR ${PNG_PNG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR} )
SET(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY})
SET(PNG_FOUND "YES")
IF (CYGWIN)
IF(BUILD_SHARED_LIBS)
# No need to define PNG_USE_DLL here, because it's default for Cygwin.
ELSE(BUILD_SHARED_LIBS)
SET (PNG_DEFINITIONS -DPNG_STATIC)
ENDIF(BUILD_SHARED_LIBS)
ENDIF (CYGWIN)
ENDIF (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR)
ENDIF(ZLIB_FOUND)
IF (PNG_FOUND)
IF (NOT PNG_FIND_QUIETLY)
MESSAGE(STATUS "Found PNG: ${PNG_LIBRARY}")
ENDIF (NOT PNG_FIND_QUIETLY)
ELSE (PNG_FOUND)
IF (PNG_FIND_REQUIRED)
MESSAGE(FATAL_ERROR "Could not find PNG library")
ENDIF (PNG_FIND_REQUIRED)
ENDIF (PNG_FOUND)
MARK_AS_ADVANCED(PNG_PNG_INCLUDE_DIR PNG_LIBRARY )
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