# Distributed under the OSI-approved BSD 3-Clause License. See accompanying # file Copyright.txt or https://cmake.org/licensing for details. #.rst: # FindGIF # ------- # # This finds the GIF library (giflib) # # The module defines the following variables: # # ``GIF_FOUND`` # True if giflib was found # ``GIF_LIBRARIES`` # Libraries to link to in order to use giflib # ``GIF_INCLUDE_DIR`` # where to find the headers # ``GIF_VERSION`` # 3, 4 or a full version string (eg 5.1.4) for versions >= 4.1.6 # # The minimum required version of giflib can be specified using the # standard syntax, e.g. find_package(GIF 4) # # $GIF_DIR is an environment variable that would correspond to the # ./configure --prefix=$GIF_DIR # Created by Eric Wing. # Modifications by Alexander Neundorf, Ben Campbell find_path(GIF_INCLUDE_DIR gif_lib.h HINTS ENV GIF_DIR PATH_SUFFIXES include PATHS ~/Library/Frameworks /usr/freeware ) # the gif library can have many names :-/ set(POTENTIAL_GIF_LIBS gif libgif ungif libungif giflib giflib4) find_library(GIF_LIBRARY NAMES ${POTENTIAL_GIF_LIBS} HINTS ENV GIF_DIR PATH_SUFFIXES lib PATHS ~/Library/Frameworks /usr/freeware ) # see readme.txt set(GIF_LIBRARIES ${GIF_LIBRARY}) # Very basic version detection. # The GIF_LIB_VERSION string in gif_lib.h seems to be unreliable, since it seems # to be always " Version 2.0, " in versions 3.x of giflib. # In version 4 the member UserData was added to GifFileType, so we check for this # one. # Versions after 4.1.6 define GIFLIB_MAJOR, GIFLIB_MINOR, and GIFLIB_RELEASE # see http://giflib.sourceforge.net/gif_lib.html#compatibility if(GIF_INCLUDE_DIR) include(${CMAKE_CURRENT_LIST_DIR}/CMakePushCheckState.cmake) include(${CMAKE_CURRENT_LIST_DIR}/CheckStructHasMember.cmake) CMAKE_PUSH_CHECK_STATE() set(CMAKE_REQUIRED_QUIET ${GIF_FIND_QUIETLY}) set(CMAKE_REQUIRED_INCLUDES "${GIF_INCLUDE_DIR}") # Check for the specific version defines (>=4.1.6 only) file(STRINGS ${GIF_INCLUDE_DIR}/gif_lib.h _GIF_DEFS REGEX "^[ \t]*#define[ \t]+GIFLIB_(MAJOR|MINOR|RELEASE)") if(_GIF_DEFS) # yay - got exact version info string(REGEX REPLACE ".*GIFLIB_MAJOR ([0-9]+).*" "\\1" _GIF_MAJ "${_GIF_DEFS}") string(REGEX REPLACE ".*GIFLIB_MINOR ([0-9]+).*" "\\1" _GIF_MIN "${_GIF_DEFS}") string(REGEX REPLACE ".*GIFLIB_RELEASE ([0-9]+).*" "\\1" _GIF_REL "${_GIF_DEFS}") set(GIF_VERSION "${_GIF_MAJ}.${_GIF_MIN}.${_GIF_REL}") else() # use UserData field to sniff version instead CHECK_STRUCT_HAS_MEMBER(GifFileType UserData gif_lib.h GIF_GifFileType_UserData ) if(GIF_GifFileType_UserData) set(GIF_VERSION 4) else() set(GIF_VERSION 3) endif() endif() unset(_GIF_MAJ) unset(_GIF_MIN) unset(_GIF_REL) unset(_GIF_DEFS) CMAKE_POP_CHECK_STATE() endif() include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) FIND_PACKAGE_HANDLE_STANDARD_ARGS(GIF REQUIRED_VARS GIF_LIBRARY GIF_INCLUDE_DIR VERSION_VAR GIF_VERSION ) mark_as_advanced(GIF_INCLUDE_DIR GIF_LIBRARY)