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Diffstat (limited to 'Modules/FindPNG.cmake')
-rw-r--r-- | Modules/FindPNG.cmake | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/Modules/FindPNG.cmake b/Modules/FindPNG.cmake new file mode 100644 index 000000000..a6c181cb1 --- /dev/null +++ b/Modules/FindPNG.cmake @@ -0,0 +1,75 @@ +# - 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(PNG_FIND_QUIETLY) +find_package(ZLIB ${_FIND_ZLIB_ARG}) + +if(ZLIB_FOUND) + find_path(PNG_PNG_INCLUDE_DIR png.h + /usr/local/include/libpng # OpenBSD + ) + + set(PNG_NAMES ${PNG_NAMES} png libpng png15 libpng15 png15d libpng15d png14 libpng14 png14d libpng14d png12 libpng12 png12d libpng12d) + find_library(PNG_LIBRARY NAMES ${PNG_NAMES} ) + + 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} ${ZLIB_LIBRARY}) + + if (CYGWIN) + if(BUILD_SHARED_LIBS) + # No need to define PNG_USE_DLL here, because it's default for Cygwin. + else(BUILD_SHARED_LIBS) + SET (PNG_DEFINITIONS -DPNG_STATIC) + endif(BUILD_SHARED_LIBS) + endif (CYGWIN) + + endif (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR) + + if (PNG_PNG_INCLUDE_DIR AND EXISTS "${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 (PNG_PNG_INCLUDE_DIR AND EXISTS "${PNG_PNG_INCLUDE_DIR}/png.h") +endif(ZLIB_FOUND) + +# handle the QUIETLY and REQUIRED arguments and set PNG_FOUND to TRUE if +# all listed variables are TRUE +include(${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 ) |