| #.rst: |
| # FindPNG |
| # ------- |
| # |
| # Find the native PNG includes and library |
| # |
| # |
| # |
| # This module searches libpng, the library for working with PNG images. |
| # |
| # It defines the following variables |
| # |
| # ``PNG_INCLUDE_DIRS`` |
| # 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. |
| # ``PNG_VERSION_STRING`` |
| # the version of the PNG library found (since CMake 2.8.8) |
| # |
| # Also defined, but not for general use are |
| # |
| # ``PNG_LIBRARY`` |
| # where to find the PNG library. |
| # |
| # For backward compatiblity the variable PNG_INCLUDE_DIR is also set. |
| # It has the same value as PNG_INCLUDE_DIRS. |
| # |
| # Since PNG depends on the ZLib compression library, none of the above |
| # will be defined unless ZLib can be found. |
| |
| #============================================================================= |
| # Copyright 2002-2009 Kitware, Inc. |
| # |
| # Distributed under the OSI-approved BSD License (the "License"); |
| # see accompanying file Copyright.txt for details. |
| # |
| # This software is distributed WITHOUT ANY WARRANTY; without even the |
| # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| # See the License for more information. |
| #============================================================================= |
| # (To distribute this file outside of CMake, substitute the full |
| # License text for the above reference.) |
| |
| if(PNG_FIND_QUIETLY) |
| set(_FIND_ZLIB_ARG QUIET) |
| endif() |
| find_package(ZLIB ${_FIND_ZLIB_ARG}) |
| |
| if(ZLIB_FOUND) |
| find_path(PNG_PNG_INCLUDE_DIR png.h |
| /usr/local/include/libpng # OpenBSD |
| ) |
| |
| list(APPEND PNG_NAMES png libpng) |
| unset(PNG_NAMES_DEBUG) |
| set(_PNG_VERSION_SUFFIXES 17 16 15 14 12) |
| if (PNG_FIND_VERSION MATCHES "^([0-9]+)\\.([0-9]+)(\\..*)?$") |
| 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}) |
| list(APPEND PNG_NAMES_DEBUG png${v}d libpng${v}d) |
| endforeach() |
| unset(_PNG_VERSION_SUFFIXES) |
| # For compatiblity 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 ${PNG_NAMES_DEBUG}) |
| include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake) |
| 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 compatiblity |
| set(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY}) |
| |
| if (CYGWIN) |
| if(BUILD_SHARED_LIBS) |
| # No need to define PNG_USE_DLL here, because it's default for Cygwin. |
| else() |
| set (PNG_DEFINITIONS -DPNG_STATIC) |
| endif() |
| endif () |
| |
| endif () |
| |
| if (PNG_PNG_INCLUDE_DIR AND EXISTS "${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() |
| |
| # handle the QUIETLY and REQUIRED arguments and set PNG_FOUND to TRUE if |
| # all listed variables are TRUE |
| include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) |
| 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 ) |