CMAKE - add option to find and enable webp output MAGP-1137

CMakeLists.txt

@@ -56,6 +56,12 @@ ecbuild_add_option( FEATURE GEOTIFF
                     CONDITION HAVE_CAIRO
                     REQUIRED_PACKAGES GeoTIFF )
 
+ecbuild_add_option( FEATURE WEBP
+                    DEFAULT OFF
+                    DESCRIPTION "webp support [implies cairo]"
+                    CONDITION HAVE_CAIRO
+                    REQUIRED_PACKAGES WEBP )
+
 ecbuild_add_option( FEATURE NETCDF
                     DEFAULT ON
                     DESCRIPTION "enable netcdf support"
@@ -274,6 +280,12 @@ if( HAVE_GEOTIFF )
 	list( APPEND MAGICS_EXTRA_DEFINITIONS	HAVE_GEOTIFF )
 endif()
 
+if( HAVE_WEBP )
+	list( APPEND MAGICS_EXTRA_INCLUDE_DIRS	${WEBP_INCLUDE_DIR} )
+	list( APPEND MAGICS_EXTRA_LIBRARIES ${WEBP_LIBRARY} )
+	list( APPEND MAGICS_EXTRA_DEFINITIONS	HAVE_WEBP )
+endif()
+
 list( APPEND MAGICS_EXTRA_LIBRARIES     ${CMAKE_THREAD_LIBS_INIT} )
 
 if( EC_OS_NAME MATCHES "windows" )

cmake/FindWebP.cmake

@@ -0,0 +1,69 @@
+# (C) Copyright 2023- ECMWF.
+#
+# This software is licensed under the terms of the Apache Licence Version 2.0
+# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+# In applying this licence, ECMWF does not waive the privileges and immunities
+# granted to it by virtue of its status as an intergovernmental organisation
+# nor does it submit to any jurisdiction.
+
+# - Try to find the WebP includes and library
+# This module defines
+#
+#  WEBP_FOUND         - System has WebP
+#  WEBP_INCLUDE_DIRS  - the WebP include directories
+#  WEBP_LIBRARIES     - the libraries needed to use WebP
+#
+# The following paths will be searched with priority if set in CMake or env
+#
+#  WEBP_DIR   - root folder of the WebP installation
+#  WEBP_PATH  - root folder of the WebP installation
+#
+# Define WEBP_MIN_VERSION for which version desired.
+
+if( NOT WEBP_PATH )
+    if ( NOT "$ENV{WEBP_PATH}" STREQUAL "" )
+        set( WEBP_PATH "$ENV{WEBP_PATH}" )
+    elseif ( NOT "$ENV{WEBP_DIR}" STREQUAL "" )
+        set( WEBP_PATH "$ENV{WEBP_DIR}" )
+    endif()
+endif()
+
+if( NOT WEBP_PATH )
+
+    include(FindPkgConfig)
+
+    if(WEBP_MIN_VERSION)
+        pkg_check_modules(PKWEBP ${_pkgconfig_REQUIRED} QUIET WEBP>=${WEBP_MIN_VERSION})
+    else()
+        pkg_check_modules(PKWEBP ${_pkgconfig_REQUIRED} QUIET WEBP)
+    endif()
+
+    if( PKG_CONFIG_FOUND AND PKWEBP_FOUND )
+
+        find_path(WEBP_INCLUDE_DIR encode.h HINTS ${PKWEBP_INCLUDEDIR} ${PKWEBP_INCLUDE_DIRS} PATH_SUFFIXES WEBP NO_DEFAULT_PATH )
+        find_library(WEBP_LIBRARY  webp     HINTS ${PKWEBP_LIBDIR}     ${PKWEBP_LIBRARY_DIRS} PATH_SUFFIXES WEBP NO_DEFAULT_PATH )
+
+    endif()
+
+endif()
+
+if( WEBP_PATH )
+
+    find_path(WEBP_INCLUDE_DIR NAMES encode.h PATHS ${WEBP_PATH} ${WEBP_PATH}/include PATH_SUFFIXES WEBP NO_DEFAULT_PATH )
+    find_library(WEBP_LIBRARY  NAMES webp   PATHS ${WEBP_PATH} ${WEBP_PATH}/lib     PATH_SUFFIXES WEBP NO_DEFAULT_PATH )
+
+endif()
+
+find_path(WEBP_INCLUDE_DIR NAMES encode.h PATHS PATH_SUFFIXES WEBP )
+find_library( WEBP_LIBRARY NAMES webp     PATHS PATH_SUFFIXES WEBP )
+
+
+# handle the QUIETLY and REQUIRED arguments and set GRIBAPI_FOUND
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(WEBP  DEFAULT_MSG
+                                  WEBP_LIBRARY WEBP_INCLUDE_DIR)
+
+set( WEBP_LIBRARIES    ${WEBP_LIBRARY} )
+set( WEBP_INCLUDE_DIRS ${WEBP_INCLUDE_DIR} )
+
+mark_as_advanced( WEBP_INCLUDE_DIR WEBP_LIBRARY )