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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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FindGIF
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-------
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This finds the Graphics Interchange Format (GIF) library (``giflib``)
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Imported targets
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^^^^^^^^^^^^^^^^
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This module defines the following :prop_tgt:`IMPORTED` target:
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``GIF::GIF``
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The ``giflib`` library, if found.
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Result variables
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^^^^^^^^^^^^^^^^
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This module will set the following variables in your project:
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``GIF_FOUND``
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If false, do not try to use GIF.
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``GIF_INCLUDE_DIRS``
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where to find gif_lib.h, etc.
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``GIF_LIBRARIES``
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the libraries needed to use GIF.
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``GIF_VERSION``
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3, 4 or a full version string (eg 5.1.4) for versions >= 4.1.6.
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Cache variables
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^^^^^^^^^^^^^^^
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The following cache variables may also be set:
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``GIF_INCLUDE_DIR``
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where to find the GIF headers.
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``GIF_LIBRARY``
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where to find the GIF library.
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Hints
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^^^^^
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``GIF_DIR`` is an environment variable that would correspond to the
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``./configure --prefix=$GIF_DIR``.
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#]=======================================================================]
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# Created by Eric Wing.
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# Modifications by Alexander Neundorf, Ben Campbell
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find_path(GIF_INCLUDE_DIR gif_lib.h
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HINTS
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ENV GIF_DIR
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PATH_SUFFIXES include
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)
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# the gif library can have many names :-/
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set(POTENTIAL_GIF_LIBS gif libgif ungif libungif giflib giflib4)
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find_library(GIF_LIBRARY
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NAMES ${POTENTIAL_GIF_LIBS}
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HINTS
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ENV GIF_DIR
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PATH_SUFFIXES lib
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)
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# Very basic version detection.
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# The GIF_LIB_VERSION string in gif_lib.h seems to be unreliable, since it seems
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# to be always " Version 2.0, " in versions 3.x of giflib.
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# In version 4 the member UserData was added to GifFileType, so we check for this
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# one.
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# Versions after 4.1.6 define GIFLIB_MAJOR, GIFLIB_MINOR, and GIFLIB_RELEASE
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# see http://giflib.sourceforge.net/gif_lib.html#compatibility
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if(GIF_INCLUDE_DIR)
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include(${CMAKE_CURRENT_LIST_DIR}/CMakePushCheckState.cmake)
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include(${CMAKE_CURRENT_LIST_DIR}/CheckStructHasMember.cmake)
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CMAKE_PUSH_CHECK_STATE()
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set(CMAKE_REQUIRED_QUIET ${GIF_FIND_QUIETLY})
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set(CMAKE_REQUIRED_INCLUDES "${GIF_INCLUDE_DIR}")
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# Check for the specific version defines (>=4.1.6 only)
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file(STRINGS ${GIF_INCLUDE_DIR}/gif_lib.h _GIF_DEFS REGEX "^[ \t]*#define[ \t]+GIFLIB_(MAJOR|MINOR|RELEASE)")
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if(_GIF_DEFS)
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# yay - got exact version info
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string(REGEX REPLACE ".*GIFLIB_MAJOR ([0-9]+).*" "\\1" _GIF_MAJ "${_GIF_DEFS}")
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string(REGEX REPLACE ".*GIFLIB_MINOR ([0-9]+).*" "\\1" _GIF_MIN "${_GIF_DEFS}")
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string(REGEX REPLACE ".*GIFLIB_RELEASE ([0-9]+).*" "\\1" _GIF_REL "${_GIF_DEFS}")
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set(GIF_VERSION "${_GIF_MAJ}.${_GIF_MIN}.${_GIF_REL}")
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else()
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# use UserData field to sniff version instead
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CHECK_STRUCT_HAS_MEMBER(GifFileType UserData gif_lib.h GIF_GifFileType_UserData )
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if(GIF_GifFileType_UserData)
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set(GIF_VERSION 4)
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else()
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set(GIF_VERSION 3)
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endif()
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endif()
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unset(_GIF_MAJ)
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unset(_GIF_MIN)
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unset(_GIF_REL)
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unset(_GIF_DEFS)
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CMAKE_POP_CHECK_STATE()
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endif()
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(GIF REQUIRED_VARS GIF_LIBRARY GIF_INCLUDE_DIR
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VERSION_VAR GIF_VERSION )
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if(GIF_FOUND)
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set(GIF_INCLUDE_DIRS "${GIF_INCLUDE_DIR}")
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set(GIF_LIBRARIES ${GIF_LIBRARY})
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if(NOT TARGET GIF::GIF)
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add_library(GIF::GIF UNKNOWN IMPORTED)
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set_target_properties(GIF::GIF PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES "${GIF_INCLUDE_DIRS}")
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if(EXISTS "${GIF_LIBRARY}")
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set_target_properties(GIF::GIF PROPERTIES
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IMPORTED_LINK_INTERFACE_LANGUAGES "C"
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IMPORTED_LOCATION "${GIF_LIBRARY}")
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endif()
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endif()
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endif()
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mark_as_advanced(GIF_INCLUDE_DIR GIF_LIBRARY)
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