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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)
IF(ZLIB_FOUND)
FIND_PATH(PNG_PNG_INCLUDE_DIR png.h
/usr/local/include/libpng # OpenBSD
)
# On win32, qt statically links to zlib and libpng, and exports their symbols.
# We can just link to Qt to get zlib and libpng. We still require the user to
# supply their own headers on the search path, but they can and should just
# specify ${QTDIR}/src/3rdparty/zlib/include .
# To use this, you must use FindQt before FindPng.
IF(QT_QTCORE_LIBRARY AND USE_QT_ZLIB_PNGLIB)
MESSAGE("Using libpng from qt")
IF(NOT "${ZLIB_LIBRARY}" STREQUAL "${QT_QTCORE_LIBRARY}")
MESSAGE("WARNING: We may be using an external zlib but qt's libpng")
ENDIF(NOT "${ZLIB_LIBRARY}" STREQUAL "${QT_QTCORE_LIBRARY}")
SET(PNG_LIBRARY_RELEASE ${QT_QTCORE_LIBRARY_RELEASE})
SET(PNG_LIBRARY_DEBUG ${QT_QTCORE_LIBRARY_DEBUG})
SET(PNG_LIBRARY ${QT_QTCORE_LIBRARY})
ELSE(QT_QTCORE_LIBRARY AND USE_QT_ZLIB_PNGLIB)
SET(PNG_NAMES_RELEASE ${PNG_NAMES_RELEASE} ${PNG_NAMES} png libpng png13 libpng13)
FIND_LIBRARY(PNG_LIBRARY_RELEASE NAMES ${PNG_NAMES_RELEASE} )
SET(PNG_NAMES_DEBUG ${PNG_NAMES} pngd libpngd png13d libpng13d)
FIND_LIBRARY(PNG_LIBRARY_DEBUG NAMES ${PNG_NAMES_DEBUG} )
INCLUDE(LibraryDebugAndRelease)
SET_LIBRARY_FROM_DEBUG_AND_RELEASE(PNG)
ENDIF(QT_QTCORE_LIBRARY AND USE_QT_ZLIB_PNGLIB)
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} )
IF(NOT USE_QT_ZLIB_PNGLIB)
# libpng requires zlib unless we're linking to both in the form of Qt
SET(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY})
ENDIF(NOT USE_QT_ZLIB_PNGLIB)
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)
# handle the QUIETLY and REQUIRED arguments and set PNG_FOUND to TRUE if
# all listed variables are TRUE
INCLUDE(ScribusFindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(PNG DEFAULT_MSG PNG_LIBRARY PNG_PNG_INCLUDE_DIR)
MESSAGE("Using PNG Library: ${PNG_LIBRARY}")
MARK_AS_ADVANCED(PNG_PNG_INCLUDE_DIR PNG_LIBRARY )
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