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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindJPEG
--------
Finds the Joint Photographic Experts Group (JPEG) library (``libjpeg``).
.. versionchanged:: 3.12
Debug and Release JPEG library variants are now found separately.
Imported Targets
^^^^^^^^^^^^^^^^
This module provides the following :ref:`Imported Targets`:
``JPEG::JPEG``
.. versionadded:: 3.12
Target encapsulating the JPEG library usage requirements. It is available
only when JPEG is found.
Result Variables
^^^^^^^^^^^^^^^^
This module sets the following variables:
``JPEG_FOUND``
Boolean indicating whether the JPEG is found.
``JPEG_INCLUDE_DIRS``
Include directories containing headers needed to use JPEG.
``JPEG_LIBRARIES``
Libraries needed to link to JPEG.
``JPEG_VERSION``
.. versionadded:: 3.12
The version of the JPEG library found.
Cache Variables
^^^^^^^^^^^^^^^
The following cache variables may also be set:
``JPEG_INCLUDE_DIR``
Directory containing the ``jpeglib.h`` and related header files.
``JPEG_LIBRARY_RELEASE``
.. versionadded:: 3.12
Path to the release (optimized) variant of the JPEG library.
``JPEG_LIBRARY_DEBUG``
.. versionadded:: 3.12
Path to the debug variant of the JPEG library.
Obsolete Variables
^^^^^^^^^^^^^^^^^^
The following legacy variables are provided for backward compatibility:
``JPEG_LIBRARY``
.. versionchanged:: 3.12
This variable has been superseded by the ``JPEG_LIBRARY_RELEASE`` and
``JPEG_LIBRARY_DEBUG`` variables.
Path to the JPEG library.
Examples
^^^^^^^^
Finding JPEG library and linking it to a project target:
.. code-block:: cmake
find_package(JPEG)
target_link_libraries(project_target PRIVATE JPEG::JPEG)
#]=======================================================================]
cmake_policy(PUSH)
cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>
find_path(JPEG_INCLUDE_DIR jpeglib.h)
set(jpeg_names ${JPEG_NAMES} jpeg jpeg-static libjpeg libjpeg-static)
foreach(name ${jpeg_names})
list(APPEND jpeg_names_debug "${name}d")
endforeach()
if(NOT JPEG_LIBRARY)
find_library(JPEG_LIBRARY_RELEASE NAMES ${jpeg_names} NAMES_PER_DIR)
find_library(JPEG_LIBRARY_DEBUG NAMES ${jpeg_names_debug} NAMES_PER_DIR)
include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
select_library_configurations(JPEG)
mark_as_advanced(JPEG_LIBRARY_RELEASE JPEG_LIBRARY_DEBUG)
endif()
unset(jpeg_names)
unset(jpeg_names_debug)
if(JPEG_INCLUDE_DIR)
file(GLOB _JPEG_CONFIG_HEADERS_FEDORA "${JPEG_INCLUDE_DIR}/jconfig*.h")
file(GLOB _JPEG_CONFIG_HEADERS_DEBIAN "${JPEG_INCLUDE_DIR}/*/jconfig.h")
set(_JPEG_CONFIG_HEADERS
"${JPEG_INCLUDE_DIR}/jpeglib.h"
${_JPEG_CONFIG_HEADERS_FEDORA}
${_JPEG_CONFIG_HEADERS_DEBIAN})
foreach (_JPEG_CONFIG_HEADER IN LISTS _JPEG_CONFIG_HEADERS)
if (NOT EXISTS "${_JPEG_CONFIG_HEADER}")
continue ()
endif ()
file(STRINGS "${_JPEG_CONFIG_HEADER}"
jpeg_lib_version REGEX "^#define[\t ]+JPEG_LIB_VERSION[\t ]+.*")
if (NOT jpeg_lib_version)
continue ()
endif ()
string(REGEX REPLACE "^#define[\t ]+JPEG_LIB_VERSION[\t ]+([0-9]+).*"
"\\1" JPEG_VERSION "${jpeg_lib_version}")
break ()
endforeach ()
unset(jpeg_lib_version)
unset(_JPEG_CONFIG_HEADER)
unset(_JPEG_CONFIG_HEADERS)
unset(_JPEG_CONFIG_HEADERS_FEDORA)
unset(_JPEG_CONFIG_HEADERS_DEBIAN)
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(JPEG
REQUIRED_VARS JPEG_LIBRARY JPEG_INCLUDE_DIR
VERSION_VAR JPEG_VERSION)
if(JPEG_FOUND)
set(JPEG_LIBRARIES ${JPEG_LIBRARY})
set(JPEG_INCLUDE_DIRS "${JPEG_INCLUDE_DIR}")
if(NOT TARGET JPEG::JPEG)
add_library(JPEG::JPEG UNKNOWN IMPORTED)
if(JPEG_INCLUDE_DIRS)
set_target_properties(JPEG::JPEG PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${JPEG_INCLUDE_DIRS}")
endif()
if(EXISTS "${JPEG_LIBRARY}")
set_target_properties(JPEG::JPEG PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES "C"
IMPORTED_LOCATION "${JPEG_LIBRARY}")
endif()
if(EXISTS "${JPEG_LIBRARY_RELEASE}")
set_property(TARGET JPEG::JPEG APPEND PROPERTY
IMPORTED_CONFIGURATIONS RELEASE)
set_target_properties(JPEG::JPEG PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "C"
IMPORTED_LOCATION_RELEASE "${JPEG_LIBRARY_RELEASE}")
endif()
if(EXISTS "${JPEG_LIBRARY_DEBUG}")
set_property(TARGET JPEG::JPEG APPEND PROPERTY
IMPORTED_CONFIGURATIONS DEBUG)
set_target_properties(JPEG::JPEG PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES_DEBUG "C"
IMPORTED_LOCATION_DEBUG "${JPEG_LIBRARY_DEBUG}")
endif()
endif()
endif()
mark_as_advanced(JPEG_LIBRARY JPEG_INCLUDE_DIR)
cmake_policy(POP)
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