| # 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 |
| ) |
| |
| # 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 |
| ) |
| |
| # 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) |