[libvpx] Add cmake config file (#11795)

* [libvpx] Add cmake config file

This allows libvpx to be used with

find_package(libvpx CONFIG REQUIRED)
target_link_libraries(main PRIVATE libvpx::libvpx)

Tested on all supported windows triplets.

* [libvpx] Rename cmake config file to make clear it is unofficial

* [libvpx] Add cmake config target guard

* [libvpx] Update version

ports/libvpx/CONTROL

@@ -1,5 +1,5 @@
 Source: libvpx
-Version: 1.8.1-4
+Version: 1.8.1-5
 Homepage: https://github.com/webmproject/libvpx
 Description: The reference software implementation for the video coding formats VP8 and VP9.
 Supports: !(uwp|arm|arm64)

ports/libvpx/portfile.cmake

@@ -212,5 +212,12 @@ else()
  endif()
 endif()
 
+if(NOT DEFINED VCPKG_BUILD_TYPE OR VCPKG_BUILD_TYPE STREQUAL "debug")
+ set(LIBVPX_CONFIG_DEBUG ON)
+else()
+ set(LIBVPX_CONFIG_DEBUG OFF)
+endif()
+configure_file(${CMAKE_CURRENT_LIST_DIR}/unofficial-libvpx-config.cmake.in ${CURRENT_PACKAGES_DIR}/share/unofficial-libvpx/unofficial-libvpx-config.cmake @ONLY)
+
 file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/libvpx)
 file(RENAME ${CURRENT_PACKAGES_DIR}/share/libvpx/LICENSE ${CURRENT_PACKAGES_DIR}/share/libvpx/copyright)

ports/libvpx/unofficial-libvpx-config.cmake.in

@@ -0,0 +1,49 @@
+if(NOT TARGET unofficial::libvpx::libvpx)
+ # Compute the installation prefix relative to this file.
+ get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
+ get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+ get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+
+ # Add library target (note: vpx always has a static build in vcpkg).
+ add_library(unofficial::libvpx::libvpx STATIC IMPORTED)
+
+ # Add interface include directories and link interface languages (applies to all configurations).
+ set_target_properties(unofficial::libvpx::libvpx PROPERTIES
+ INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include"
+ IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+ )
+ list(APPEND _IMPORT_CHECK_FILES "${_IMPORT_PREFIX}/include/vpx/vpx_codec.h")
+
+ # Add release configuration properties.
+ find_library(_LIBFILE_RELEASE NAMES vpx@LIBVPX_CRT_SUFFIX@ PATHS "${_IMPORT_PREFIX}/lib/" NO_DEFAULT_PATH)
+ set_property(TARGET unofficial::libvpx::libvpx
+ APPEND PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
+ set_target_properties(unofficial::libvpx::libvpx PROPERTIES
+ IMPORTED_LOCATION_RELEASE ${_LIBFILE_RELEASE})
+ list(APPEND _IMPORT_CHECK_FILES ${_LIBFILE_RELEASE})
+ unset(_LIBFILE_RELEASE CACHE)
+
+ # Add debug configuration properties.
+ if(@LIBVPX_CONFIG_DEBUG@)
+ find_library(_LIBFILE_DEBUG NAMES vpx@LIBVPX_CRT_SUFFIX@d PATHS "${_IMPORT_PREFIX}/debug/lib/" NO_DEFAULT_PATH)
+ set_property(TARGET unofficial::libvpx::libvpx
+ APPEND PROPERTY IMPORTED_CONFIGURATIONS DEBUG)
+ set_target_properties(unofficial::libvpx::libvpx PROPERTIES
+ IMPORTED_LOCATION_DEBUG ${_LIBFILE_DEBUG})
+ list(APPEND _IMPORT_CHECK_FILES ${_LIBFILE_DEBUG})
+ unset(_LIBFILE_DEBUG CACHE)
+ endif()
+
+ # Check header and library files are present.
+ foreach(file ${_IMPORT_CHECK_FILES} )
+ if(NOT EXISTS "${file}" )
+ message(FATAL_ERROR "unofficial::libvpx::libvpx references the file
+ \"${file}\"
+but this file does not exist. Possible reasons include:
+* The file was deleted, renamed, or moved to another location.
+* An install or uninstall procedure did not complete successfully.
+")
+ endif()
+ endforeach()
+ unset(_IMPORT_CHECK_FILES)
+endif()