Merge pull request #17165 from komakai:objc-binding

Objc binding

* Initial work on Objective-C wrapper

* Objective-C generator script; update manually generated wrappers

* Add Mat tests

* Core Tests

* Imgproc wrapper generation and tests

* Fixes for Imgcodecs wrapper

* Miscellaneous fixes. Swift build support

* Objective-C wrapper build/install

* Add Swift wrappers for videoio/objdetect/feature2d

* Framework build;iOS support

* Fix toArray functions;Use enum types whenever possible

* Use enum types where possible;prepare test build

* Update test

* Add test runner scripts for iOS and macOS

* Add test scripts and samples

* Build fixes

* Fix build (cmake 3.17.x compatibility)

* Fix warnings

* Fix enum name conflicting handling

* Add support for document generation with Jazzy

* Swift/Native fast accessor functions

* Add Objective-C wrapper for calib3d, dnn, ml, photo and video modules

* Remove IntOut/FloatOut/DoubleOut classes

* Fix iOS default test platform value

* Fix samples

* Revert default framework name to opencv2

* Add converter util functions

* Fix failing test

* Fix whitespace

* Add handling for deprecated methods;fix warnings;define __OPENCV_BUILD

* Suppress cmake warnings

* Reduce severity of "jazzy not found" log message

* Fix incorrect #include of compatibility header in ios.h

* Use explicit returns in subscript/get implementation

* Reduce minimum required cmake version to 3.15 for Objective-C/Swift binding

modules/objc/test/cmakelists.template

@@ -0,0 +1,45 @@
+cmake_minimum_required(VERSION 3.15)
+
+project(OpenCVTest)
+
+enable_testing()
+
+find_package(XCTest REQUIRED)
+
+# Enable C++11
+set (CMAKE_CXX_STANDARD 11)
+set (CMAKE_CXX_STANDARD_REQUIRED TRUE)
+
+set (OBJC_COMPILE_FLAGS "-fobjc-arc -fobjc-weak -fvisibility=hidden")
+set (SUPPRESS_WARNINGS_FLAGS "-Wno-incomplete-umbrella")
+set (CMAKE_C_FLAGS  "${CMAKE_C_FLAGS} ${OBJC_COMPILE_FLAGS} ${SUPPRESS_WARNINGS_FLAGS}")
+set (CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} ${OBJC_ARC_COMPILE_FLAGS} ${SUPPRESS_WARNINGS_FLAGS}")
+
+# grab the files
+file(GLOB_RECURSE test_sources "test/*\.h" "test/*\.m" "test/*\.mm" "test/*\.swift")
+
+add_library(OpenCVTest STATIC dummy/dummy.mm)
+
+enable_language(Swift)
+
+# XCTest for Framework
+xctest_add_bundle(OpenCVTestTests OpenCVTest ${test_sources} test/resources ${FRAMEWORK_DIR}/${FRAMEWORK_NAME}.framework)
+set_target_properties(OpenCVTestTests PROPERTIES
+    XCODE_ATTRIBUTE_FRAMEWORK_SEARCH_PATHS "${FRAMEWORK_DIR}"
+    XCODE_ATTRIBUTE_OTHER_SWIFT_FLAGS "-Xcc ${SUPPRESS_WARNINGS_FLAGS}"
+    )
+
+# link necessary Frameworks
+target_link_libraries(OpenCVTestTests PRIVATE "-framework Accelerate")
+target_link_libraries(OpenCVTestTests PRIVATE "-framework AVFoundation")
+target_link_libraries(OpenCVTestTests PRIVATE "-framework CoreMedia")
+if (NOT DEFINED IOS_ARCH)
+  target_link_libraries(OpenCVTestTests PRIVATE "-framework OpenCL")
+endif()
+
+# its OK to ignore stuff we don't know about since there will be no tests relying on it
+set_target_properties(OpenCVTestTests PROPERTIES LINK_FLAGS -Wl,-undefined,dynamic_lookup)
+
+set_source_files_properties(test/resources PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
+
+xctest_add_test(XCTest.OpenCVTest OpenCVTestTests)