react-native-vision-camera/ios/Frame Processor/FrameProcessorPluginHostObject.mm

//
//  FrameProcessorPluginHostObject.mm
//  VisionCamera
//
//  Created by Marc Rousavy on 21.07.23.
//  Copyright © 2023 mrousavy. All rights reserved.
//

#import "FrameProcessorPluginHostObject.h"
#import <Foundation/Foundation.h>
#import <vector>
#import "FrameHostObject.h"
#import "JSINSObjectConversion.h"

using namespace facebook;

std::vector<jsi::PropNameID> FrameProcessorPluginHostObject::getPropertyNames(jsi::Runtime& runtime) {
  std::vector<jsi::PropNameID> result;
  result.push_back(jsi::PropNameID::forUtf8(runtime, std::string("call")));
  return result;
}

jsi::Value FrameProcessorPluginHostObject::get(jsi::Runtime& runtime, const jsi::PropNameID& propName) {
  auto name = propName.utf8(runtime);

  if (name == "call") {
    return jsi::Function::createFromHostFunction(runtime,
                                                 jsi::PropNameID::forUtf8(runtime, "call"),
                                                 2,
                                                 [=](jsi::Runtime& runtime,
                                                     const jsi::Value& thisValue,
                                                     const jsi::Value* arguments,
                                                     size_t count) -> jsi::Value {
      // Frame is first argument
      auto frameHostObject = arguments[0].asObject(runtime).asHostObject<FrameHostObject>(runtime);
      Frame* frame = frameHostObject->frame;

      // Options are second argument (possibly undefined)
      NSDictionary* options = nil;
      if (count > 1) {
        auto optionsObject = arguments[1].asObject(runtime);
        options = JSINSObjectConversion::convertJSIObjectToNSDictionary(runtime, optionsObject, _callInvoker);
      }

      // Call actual Frame Processor Plugin
      id result = [_plugin callback:frame withArguments:nil];

      // Convert result value to jsi::Value (possibly undefined)
      return JSINSObjectConversion::convertObjCObjectToJSIValue(runtime, result);
    });
  }

  return jsi::Value::undefined();
}