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