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func blurFaces(in image: UIImage) -> UIImage? {
    guard let ciImage = CIImage(image: image)?
        .oriented(.init(image.imageOrientation)) else {
        return nil
    }

    // this image will use as the "mask map"
    var maskCanvasImage = CIImage.empty()
        .cropped(to: ciImage.extent)

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func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    picker.dismiss(animated: true)
    guard let image = info[.originalImage] as? UIImage else {
        return
    }

    imageView.image = image

    // layout logic, fit image view size to image ratio...
    ...

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extension CGImagePropertyOrientation {
    init(_ uiOrientation: UIImage.Orientation) {
        switch uiOrientation {
            case .up: self = .up
            case .upMirrored: self = .upMirrored
            case .down: self = .down
            case .downMirrored: self = .downMirrored
            case .left: self = .left
            case .leftMirrored: self = .leftMirrored
            case .right: self = .right

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func getFaceRects(in image: UIImage, normalizedTo rect: CGRect) -> [CGRect] {
    guard var ciImage = CIImage(image: image) else {
        print("Couldn't create CIImage.")
        return []
    }

    // correct the orientation becuase `CIImage.init` can lose it
    ciImage = ciImage.oriented(.init(image.imageOrientation))

    let scaleFactorX = rect.width / ciImage.extent.width

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import UIKit

class ImageProcessingService {
    private let ciContext = CIContext()
    private lazy var ciDetector = CIDetector(ofType: CIDetectorTypeFace, context: ciContext)!
}

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import UIKit
import Combine

class LibraryViewController: UIViewController {

    @IBOutlet weak var collectionView: UICollectionView!
    private var tokens = [AnyCancellable]()
    
    // We're making the viewModel property lazy so it can access `self` during initialization.
    private lazy var viewModel = LibraryViewModel(collectionView: collectionView)

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class LibraryViewModel: CollectionViewModel<NoteCell> {
    init(collectionView: UICollectionView) {
        super.init(collectionView: collectionView, cellReuseIdentifier: "NoteCell")
    }
}

// MARK: - UICollectionViewDelegate Implementation

extension LibraryViewModel: UICollectionViewDelegate {
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

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private func update() {
    var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
    snapshot.appendSections([.main])
    snapshot.appendItems(items.value)
    dataSource?.apply(snapshot)
}
    
public func add(_ items: [Item]) {
    items.forEach {
        self.items.value.append($0)

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// MARK: - Setup Logic

extension CollectionViewModel {
    private func cellProvider(_ collectionView: UICollectionView, indexPath: IndexPath, item: Item) -> UICollectionViewCell? {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdentifier, for: indexPath) as! CellType
        cell.provide(item)
        return cell
    }
    
    public func makeDataSource() -> DataSource {

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enum Section {
  case main
}