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58b2d760ee
Convert several preformatted code block literals that enumerate lists of options or variables to use reST definition lists instead. Manually wrap other long lines in code blocks.
126 lines
4.3 KiB
CMake
126 lines
4.3 KiB
CMake
#.rst:
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# FindPNG
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# -------
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#
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# Find the native PNG includes and library
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#
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#
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#
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# This module searches libpng, the library for working with PNG images.
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#
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# It defines the following variables
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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_definitons(${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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# Also defined, but not for general use are
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#
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# ``PNG_LIBRARY``
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# where to find the PNG library.
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#
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# For backward compatiblity the variable PNG_INCLUDE_DIR is also set.
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# It has the same value 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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#=============================================================================
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# Copyright 2002-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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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 ${_FIND_ZLIB_ARG})
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if(ZLIB_FOUND)
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find_path(PNG_PNG_INCLUDE_DIR png.h
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/usr/local/include/libpng # OpenBSD
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)
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list(APPEND PNG_NAMES png libpng)
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unset(PNG_NAMES_DEBUG)
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set(_PNG_VERSION_SUFFIXES 17 16 15 14 12)
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if (PNG_FIND_VERSION MATCHES "^([0-9]+)\\.([0-9]+)(\\..*)?$")
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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 compatiblity 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 compatiblity
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set(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY})
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if (CYGWIN)
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if(BUILD_SHARED_LIBS)
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# No need to define PNG_USE_DLL here, because it's default for Cygwin.
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else()
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set (PNG_DEFINITIONS -DPNG_STATIC)
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endif()
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endif ()
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endif ()
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if (PNG_PNG_INCLUDE_DIR AND EXISTS "${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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# handle the QUIETLY and REQUIRED arguments and set PNG_FOUND to TRUE if
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# all listed variables are TRUE
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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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