94 lines
4.1 KiB
CMake
94 lines
4.1 KiB
CMake
# - Find the native PNG includes and library
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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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# PNG_INCLUDE_DIRS, where to find png.h, etc.
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# PNG_LIBRARIES, the libraries to link against to use PNG.
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# PNG_DEFINITIONS - You should add_definitons(${PNG_DEFINITIONS}) before compiling code that includes png library files.
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# PNG_FOUND, If false, do not try to use PNG.
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# PNG_VERSION_STRING - the version of the PNG library found (since CMake 2.8.8)
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# Also defined, but not for general use are
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# PNG_LIBRARY, where to find the PNG library.
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# For backward compatiblity the variable PNG_INCLUDE_DIR is also set. 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 will be
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# 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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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# * The names of Kitware, Inc., the Insight Consortium, or the names of
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# any consortium members, or of any contributors, may not be used to
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# endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
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# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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set(PNG_NAMES ${PNG_NAMES} png libpng png15 libpng15 png15d libpng15d png14 libpng14 png14d libpng14d png12 libpng12 png12d libpng12d libpng_a)
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find_library(PNG_LIBRARY NAMES ${PNG_NAMES} )
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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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