# 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) |