react-native-vision-camera-face-detector/lib/module/hooks/useImageFaceDetector.js

Frame Processor Plugin to detect faces using MLKit Vision Face Detector for React Native Vision Camera!

"use strict";

import { useMemo } from 'react';
import { Image } from 'react-native';
import { createImageFaceDetector } from '../factory';

// types

/**
 * Use a {@linkcode ImageFaceDetector}.
 *
 * A {@linkcode ImageFaceDetector} can be used to detect
 * {@linkcode Face}s in any image provided.
 *
 * @example
 * ```ts
 * const uri = 'file:///storage/emulated/0/Download/pic.jpg'
 * const ImageFaceDetector = useFaceDetector({...})
 * const faces = ImageFaceDetector.detectFaces(uri)
 * ```
 */
export function useImageFaceDetector(options) {
  /**
   * Resolves input image
   * 
   * @param {InputImage} image Image path
   * @returns {string} Resolved image
   */
  function resolveUri(image) {
    const uri = (() => {
      switch (typeof image) {
        case 'number':
          {
            const source = Image.resolveAssetSource(image);
            return source?.uri;
          }
        case 'string':
          {
            return image;
          }
        case 'object':
          {
            return image?.uri;
          }
        default:
          {
            return undefined;
          }
      }
    })();
    if (!uri) throw new Error('Unable to resolve image');
    return uri;
  }
  return useMemo(() => {
    const imageFaceDetector = createImageFaceDetector(options);
    return {
      ...imageFaceDetector,
      // creates a wrapper to resolve uris before passing to native
      detectFaces(image) {
        const uri = resolveUri(image);
        return imageFaceDetector.detectFaces(uri);
      }
    };
  }, [options]);
}
export default useImageFaceDetector;
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