--- /dev/null
+# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+FindPNG
+-------
+
+Find libpng, the official reference library for the PNG image format.
+
+Imported targets
+^^^^^^^^^^^^^^^^
+
+This module defines the following :prop_tgt:`IMPORTED` target:
+
+``PNG::PNG``
+ The libpng library, if found.
+
+Result variables
+^^^^^^^^^^^^^^^^
+
+This module will set the following variables in your project:
+
+``PNG_INCLUDE_DIRS``
+ where to find png.h, etc.
+``PNG_LIBRARIES``
+ the libraries to link against to use PNG.
+``PNG_DEFINITIONS``
+ You should add_definitions(${PNG_DEFINITIONS}) before compiling code
+ that includes png library files.
+``PNG_FOUND``
+ If false, do not try to use PNG.
+``PNG_VERSION_STRING``
+ the version of the PNG library found (since CMake 2.8.8)
+
+Obsolete variables
+^^^^^^^^^^^^^^^^^^
+
+The following variables may also be set, for backwards compatibility:
+
+``PNG_LIBRARY``
+ where to find the PNG library.
+``PNG_INCLUDE_DIR``
+ where to find the PNG headers (same as PNG_INCLUDE_DIRS)
+
+Since PNG depends on the ZLib compression library, none of the above
+will be defined unless ZLib can be found.
+#]=======================================================================]
+
+if(PNG_FIND_QUIETLY)
+ set(_FIND_ZLIB_ARG QUIET)
+endif()
+find_package(ZLIB ${_FIND_ZLIB_ARG})
+
+if(ZLIB_FOUND)
+ find_path(PNG_PNG_INCLUDE_DIR png.h PATH_SUFFIXES include/libpng)
+
+ list(APPEND PNG_NAMES png libpng)
+ unset(PNG_NAMES_DEBUG)
+ set(_PNG_VERSION_SUFFIXES 17 16 15 14 12)
+ if (PNG_FIND_VERSION MATCHES "^([0-9]+)\\.([0-9]+)(\\..*)?$")
+ set(_PNG_VERSION_SUFFIX_MIN "${CMAKE_MATCH_1}${CMAKE_MATCH_2}")
+ if (PNG_FIND_VERSION_EXACT)
+ set(_PNG_VERSION_SUFFIXES ${_PNG_VERSION_SUFFIX_MIN})
+ else ()
+ string(REGEX REPLACE
+ "${_PNG_VERSION_SUFFIX_MIN}.*" "${_PNG_VERSION_SUFFIX_MIN}"
+ _PNG_VERSION_SUFFIXES "${_PNG_VERSION_SUFFIXES}")
+ endif ()
+ unset(_PNG_VERSION_SUFFIX_MIN)
+ endif ()
+ foreach(v IN LISTS _PNG_VERSION_SUFFIXES)
+ list(APPEND PNG_NAMES png${v} libpng${v} libpng${v}_static)
+ list(APPEND PNG_NAMES_DEBUG png${v}d libpng${v}d libpng${v}_staticd)
+ endforeach()
+ unset(_PNG_VERSION_SUFFIXES)
+ # For compatibility with versions prior to this multi-config search, honor
+ # any PNG_LIBRARY that is already specified and skip the search.
+ if(NOT PNG_LIBRARY)
+ find_library(PNG_LIBRARY_RELEASE NAMES ${PNG_NAMES})
+ find_library(PNG_LIBRARY_DEBUG NAMES ${PNG_NAMES_DEBUG})
+ include(SelectLibraryConfigurations)
+ select_library_configurations(PNG)
+ mark_as_advanced(PNG_LIBRARY_RELEASE PNG_LIBRARY_DEBUG)
+ endif()
+ unset(PNG_NAMES)
+ unset(PNG_NAMES_DEBUG)
+
+ # Set by select_library_configurations(), but we want the one from
+ # find_package_handle_standard_args() below.
+ unset(PNG_FOUND)
+
+ if (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR)
+ # png.h includes zlib.h. Sigh.
+ set(PNG_INCLUDE_DIRS ${PNG_PNG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR} )
+ set(PNG_INCLUDE_DIR ${PNG_INCLUDE_DIRS} ) # for backward compatibility
+ set(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY})
+ if((CMAKE_SYSTEM_NAME STREQUAL "Linux") AND
+ ("${PNG_LIBRARY}" MATCHES "\\${CMAKE_STATIC_LIBRARY_SUFFIX}$"))
+ list(APPEND PNG_LIBRARIES m)
+ endif()
+
+ if (CYGWIN)
+ if(BUILD_SHARED_LIBS)
+ # No need to define PNG_USE_DLL here, because it's default for Cygwin.
+ else()
+ set (PNG_DEFINITIONS -DPNG_STATIC)
+ set(_PNG_COMPILE_DEFINITIONS PNG_STATIC)
+ endif()
+ endif ()
+
+ if(NOT TARGET PNG::PNG)
+ add_library(PNG::PNG UNKNOWN IMPORTED)
+ set_target_properties(PNG::PNG PROPERTIES
+ INTERFACE_COMPILE_DEFINITIONS "${_PNG_COMPILE_DEFINITIONS}"
+ INTERFACE_INCLUDE_DIRECTORIES "${PNG_INCLUDE_DIRS}"
+ INTERFACE_LINK_LIBRARIES ZLIB::ZLIB)
+ if((CMAKE_SYSTEM_NAME STREQUAL "Linux") AND
+ ("${PNG_LIBRARY}" MATCHES "\\${CMAKE_STATIC_LIBRARY_SUFFIX}$"))
+ set_property(TARGET PNG::PNG APPEND PROPERTY
+ INTERFACE_LINK_LIBRARIES m)
+ endif()
+
+ if(EXISTS "${PNG_LIBRARY}")
+ set_target_properties(PNG::PNG PROPERTIES
+ IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+ IMPORTED_LOCATION "${PNG_LIBRARY}")
+ endif()
+ if(EXISTS "${PNG_LIBRARY_RELEASE}")
+ set_property(TARGET PNG::PNG APPEND PROPERTY
+ IMPORTED_CONFIGURATIONS RELEASE)
+ set_target_properties(PNG::PNG PROPERTIES
+ IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "C"
+ IMPORTED_LOCATION_RELEASE "${PNG_LIBRARY_RELEASE}")
+ endif()
+ if(EXISTS "${PNG_LIBRARY_DEBUG}")
+ set_property(TARGET PNG::PNG APPEND PROPERTY
+ IMPORTED_CONFIGURATIONS DEBUG)
+ set_target_properties(PNG::PNG PROPERTIES
+ IMPORTED_LINK_INTERFACE_LANGUAGES_DEBUG "C"
+ IMPORTED_LOCATION_DEBUG "${PNG_LIBRARY_DEBUG}")
+ endif()
+ endif()
+
+ unset(_PNG_COMPILE_DEFINITIONS)
+ endif ()
+
+ if (PNG_PNG_INCLUDE_DIR AND EXISTS "${PNG_PNG_INCLUDE_DIR}/png.h")
+ file(STRINGS "${PNG_PNG_INCLUDE_DIR}/png.h" png_version_str REGEX "^#define[ \t]+PNG_LIBPNG_VER_STRING[ \t]+\".+\"")
+
+ string(REGEX REPLACE "^#define[ \t]+PNG_LIBPNG_VER_STRING[ \t]+\"([^\"]+)\".*" "\\1" PNG_VERSION_STRING "${png_version_str}")
+ unset(png_version_str)
+ endif ()
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(PNG
+ REQUIRED_VARS PNG_LIBRARY PNG_PNG_INCLUDE_DIR
+ VERSION_VAR PNG_VERSION_STRING)
+
+mark_as_advanced(PNG_PNG_INCLUDE_DIR PNG_LIBRARY )
projects / xonotic / darkplaces.git / blobdiff