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# - Find libexif
# Find the native EXIF includes and library.
# Once done this will define:
#
# EXIF_ROOT_DIR - The base directory of EXIF library.
# EXIF_INCLUDE_DIRS - Where to find exif-*.h header files.
# EXIF_LIBRARIES - Libraries to be linked with executable.
# EXIF_FOUND - True if EXIF library is found.
#
# EXIF_VERSION_STRING - The version of EXIF library found (x.y.z)
# EXIF_VERSION_MAJOR - The major version of EXIF library
# EXIF_VERSION_MINOR - The minor version of EXIF library
# EXIF_VERSION_PATCH - The patch version of EXIF library
#
# Optional input variables:
#
# EXIF_USE_STATIC_LIB - This can be set to ON to use the static version of
# the library. If it does not exist in the system, a warning is printed
# and the shared library is used.
#
# If libexif is installed in a custom folder (this usually happens on Windows)
# the environment variable EXIF_ROOT_DIR can be set to the base folder of
# the library.
#
#=============================================================================
# Copyright (C) 2011 Simone Rossetto <simros85@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#=============================================================================
### FIND section ###
find_path(EXIF_ROOT_DIR
NAMES "include/libexif/exif-data.h"
PATHS ENV EXIF_ROOT_DIR)
find_path(EXIF_INCLUDE_DIR
NAMES "libexif/exif-data.h"
HINTS ${EXIF_ROOT_DIR}
PATHS ENV EXIF_ROOT_DIR
PATH_SUFFIXES "include")
find_library(EXIF_LIBRARY
NAMES "exif"
HINTS ${EXIF_ROOT_DIR}
PATHS ENV EXIF_ROOT_DIR
PATH_SUFFIXES "lib")
find_file(_exif_pkg_config_file
NAMES "libexif.pc"
HINTS ${EXIF_ROOT_DIR}
PATHS ENV EXIF_ROOT_DIR
PATH_SUFFIXES "lib/pkgconfig" "pkgconfig")
if(EXISTS ${_exif_pkg_config_file})
file(STRINGS "${_exif_pkg_config_file}" _exif_version REGEX "^Version: .*$")
string(REGEX REPLACE "^.*Version: ([0-9]+).*$" "\\1" EXIF_VERSION_MAJOR "${_exif_version}")
string(REGEX REPLACE "^.*Version: [0-9]+\\.([0-9]+).*$" "\\1" EXIF_VERSION_MINOR "${_exif_version}")
string(REGEX REPLACE "^.*Version: [0-9]+\\.[0-9]+\\.([0-9]+).*$" "\\1" EXIF_VERSION_PATCH "${_exif_version}")
set(EXIF_VERSION_STRING "${EXIF_VERSION_MAJOR}.${EXIF_VERSION_MINOR}.${EXIF_VERSION_PATCH}")
else(EXISTS ${_exif_pkg_config_file})
set(EXIF_VERSION_STRING "")
endif(EXISTS ${_exif_pkg_config_file})
### OPTIONS and COMPONENTS section ###
if(EXIF_USE_STATIC_LIB)
set(_exif_shared_lib ${EXIF_LIBRARY})
if(WIN32 AND NOT MSVC)
string(REPLACE ".dll.a" ".a" _exif_static_lib ${_exif_shared_lib})
elseif(APPLE)
string(REPLACE ".dylib" ".a" _exif_static_lib ${_exif_shared_lib})
elseif(UNIX)
string(REPLACE ".so" ".a" _exif_static_lib ${_exif_shared_lib})
endif()
if(EXISTS ${_exif_static_lib})
set(EXIF_LIBRARY ${_exif_static_lib})
else(EXISTS ${_exif_static_lib})
message(WARNING "EXIF static library does not exist, using the shared one.")
set(EXIF_LIBRARY ${_exif_shared_lib})
endif(EXISTS ${_exif_static_lib})
endif(EXIF_USE_STATIC_LIB)
mark_as_advanced(
EXIF_LIBRARY
EXIF_INCLUDE_DIR
_exif_pkg_config_file
_exif_shared_lib
_exif_static_lib)
### final check ###
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(EXIF
REQUIRED_VARS EXIF_LIBRARY EXIF_INCLUDE_DIR
VERSION_VAR EXIF_VERSION_STRING)
if(EXIF_FOUND)
set(EXIF_INCLUDE_DIRS ${EXIF_INCLUDE_DIR} "${EXIF_INCLUDE_DIR}/libexif")
set(EXIF_LIBRARIES ${EXIF_LIBRARY})
endif(EXIF_FOUND)
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