feat: add conditional inclusion support to header parser

modules/objc/generator/CMakeLists.txt

@@ -38,6 +38,13 @@ if(HAVE_opencv_objc)
   set(__objc_build_dir "\"objc_build_dir\": \"${CMAKE_CURRENT_BINARY_DIR}/../objc\",")
 endif()
 
+include("${OpenCV_SOURCE_DIR}/cmake/OpenCVBindingsPreprocessorDefinitions.cmake")
+
+ocv_bindings_generator_populate_preprocessor_definitions(
+  OPENCV_MODULES_BUILD
+  opencv_preprocessor_defs
+)
+
 set(CONFIG_FILE "${CMAKE_CURRENT_BINARY_DIR}/gen_objc.json")
 set(__config_str
 "{
@@ -45,7 +52,10 @@ set(__config_str
   ${__objc_build_dir}
   \"modules\": [
 ${__modules_config}
-  ]
+  ],
+  \"preprocessor_definitions\": {
+${opencv_preprocessor_defs}
+  }
 }
 ")
 #TODO: ocv_update_file("${CONFIG_FILE}" "${__config_str}" ON_CHANGE_REMOVE "${OPENCV_DEPHELPER}/gen_opencv_objc_source")

modules/objc/generator/gen_objc.py

@@ -894,7 +894,8 @@ class ObjectiveCWrapperGenerator(object):
         namespace = self.classes[cname].namespace if cname in self.classes else "cv"
         return namespace.replace(".", "::") + "::"
 
-    def gen(self, srcfiles, module, output_path, output_objc_path, common_headers, manual_classes):
+    def gen(self, srcfiles, module, output_path, output_objc_path,
+            common_headers, manual_classes, preprocessor_definitions=None):
         self.clear()
         self.module = module
         self.objcmodule = make_objcmodule(module)
@@ -903,7 +904,10 @@ class ObjectiveCWrapperGenerator(object):
         extension_signatures = []
 
         # TODO: support UMat versions of declarations (implement UMat-wrapper for Java)
-        parser = hdr_parser.CppHeaderParser(generate_umat_decls=False)
+        parser = hdr_parser.CppHeaderParser(
+            generate_umat_decls=False,
+            preprocessor_definitions=preprocessor_definitions
+        )
 
         module_ci = self.add_class( ['class ' + self.Module, '', [], []]) # [ 'class/struct cname', ':bases', [modlist] [props] ]
         module_ci.header_import = module + '.hpp'
@@ -1715,7 +1719,9 @@ if __name__ == "__main__":
         manual_classes = [x for x in [x[x.rfind('/')+1:-2] for x in [x for x in copied_files if x.endswith('.h')]] if x in type_dict]
 
         if len(srcfiles) > 0:
-            generator.gen(srcfiles, module, dstdir, objc_base_path, common_headers, manual_classes)
+            generator.gen(srcfiles, module, dstdir, objc_base_path,
+                          common_headers, manual_classes,
+                          config.get("preprocessor_definitions"))
         else:
             logging.info("No generated code for module: %s", module)
     generator.finalize(args.target, objc_base_path, objc_build_dir)