feat: support updating image while cropping

Example/Base.lproj/Main.storyboard

@@ -268,8 +268,11 @@
                         <barButtonItem systemItem="bookmarks" id="sQZ-M0-ZLt">
                             <color key="tintColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                         </barButtonItem>
-                        <barButtonItem systemItem="organize" id="EKa-xq-dX9">
+                        <barButtonItem image="camera.filters" catalog="system" id="EKa-xq-dX9">
                             <color key="tintColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                            <connections>
+                                <action selector="updateImage:" destination="aIe-ND-Zfg" id="0bA-SX-yC1"/>
+                            </connections>
                         </barButtonItem>
                         <barButtonItem systemItem="action" id="Dzq-Lk-Lna">
                             <color key="tintColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
@@ -338,9 +341,10 @@
         </scene>
     </scenes>
     <resources>
+        <image name="camera.filters" catalog="system" width="128" height="119"/>
         <image name="sunflower" width="3648" height="5472"/>
         <systemColor name="systemGray6Color">
-            <color red="0.94901960784313721" green="0.94901960784313721" blue="0.96862745098039216" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <color red="0.94901960780000005" green="0.94901960780000005" blue="0.96862745100000003" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
         </systemColor>
         <systemColor name="systemYellowColor">
             <color red="1" green="0.80000000000000004" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>

Example/EmbeddedCropViewController.swift

@@ -10,7 +10,7 @@ import UIKit
 import Mantis
 
 class EmbeddedCropViewController: UIViewController {
-
+    
     var image: UIImage?
     var cropViewController: CropViewController?
 
@@ -63,13 +63,21 @@ class EmbeddedCropViewController: UIViewController {
         cropViewController?.crop()
     }
 
+    @IBAction func updateImage(_ sender: Any) {
+        guard let image else {
+            return
+        }
+
+        cropViewController?.update(image.addFilter(filter: .Mono))
+    }
+
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
         guard let cropViewController = segue.destination as? CropViewController, let image = image else {
             return
         }
 
         cropViewController.delegate = self
-                    
+
         var config = Mantis.Config()
         config.cropToolbarConfig.mode = .embedded
         config.enableUndoRedo = true
@@ -91,8 +99,8 @@ class EmbeddedCropViewController: UIViewController {
     override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
 
         if action == #selector(EmbeddedCropViewController.undoButtonPressed(_:)) ||
-           action == #selector(EmbeddedCropViewController.redoButtonPressed(_:))  ||
-           action == #selector(EmbeddedCropViewController.resetButtonPressed(_:)) {
+            action == #selector(EmbeddedCropViewController.redoButtonPressed(_:))  ||
+            action == #selector(EmbeddedCropViewController.resetButtonPressed(_:)) {
 
             return cropViewController!.isUndoSupported()
         }
@@ -105,7 +113,7 @@ class EmbeddedCropViewController: UIViewController {
         guard let cropViewController else { return }
 
         if cropViewController.isUndoSupported() {
-
+            
             if command.action == #selector(EmbeddedCropViewController.undoButtonPressed(_:)) {
 
                 let undoString = NSLocalizedString("Undo", comment: "Undo")
@@ -138,7 +146,7 @@ class EmbeddedCropViewController: UIViewController {
             }
         }
     }
-
+    
 }
 
 extension EmbeddedCropViewController: CropViewControllerDelegate {
@@ -176,3 +184,29 @@ extension EmbeddedCropViewController: CropViewControllerDelegate {
         self.resolutionLabel.text = "\(Int(size.width)) x \(Int(size.height)) pixels"
     }
 }
+
+enum FilterType : String {
+    case Chrome = "CIPhotoEffectChrome"
+    case Fade = "CIPhotoEffectFade"
+    case Instant = "CIPhotoEffectInstant"
+    case Mono = "CIPhotoEffectMono"
+    case Noir = "CIPhotoEffectNoir"
+    case Process = "CIPhotoEffectProcess"
+    case Tonal = "CIPhotoEffectTonal"
+    case Transfer = "CIPhotoEffectTransfer"
+}
+
+extension UIImage {
+    func addFilter(filter : FilterType) -> UIImage {
+        let filter = CIFilter(name: filter.rawValue)
+        // convert UIImage to CIImage and set as input
+        let ciInput = CIImage(image: self)
+        filter?.setValue(ciInput, forKey: "inputImage")
+        // get output CIImage, render as CGImage first to retain proper UIImage scale
+        let ciOutput = filter?.outputImage
+        let ciContext = CIContext()
+        let cgImage = ciContext.createCGImage(ciOutput!, from: (ciOutput?.extent)!)
+        //Return the image
+        return UIImage(cgImage: cgImage!)
+    }
+}

Sources/Mantis/CropView/CropView.swift

@@ -657,7 +657,6 @@ extension CropView {
     }
 
     public func makeCropState() -> CropState {
-
         return CropState(
             rotationType: viewModel.rotationType,
             degrees: viewModel.degrees,
@@ -1216,6 +1215,11 @@ extension CropView: CropViewProtocol {
         viewModel.setRotatingStatus(by: angle)
         rotationControlView?.updateRotationValue(by: angle)
     }
+
+    func update(_ image: UIImage) {
+        self.image = image
+        imageContainer.update(image)
+    }
 }
 
 extension UIActivityIndicatorView: ActivityIndicatorProtocol {

Sources/Mantis/CropView/ImageContainer.swift

@@ -65,4 +65,8 @@ extension ImageContainer: ImageContainerProtocol {
                           bottomLeft: bottomLeft,
                           bottomRight: bottomRight)
     }
+
+    func update(_ image: UIImage) {
+        imageView.image = image
+    }
 }

Sources/Mantis/CropViewController/CropViewController.swift

@@ -596,6 +596,10 @@ extension CropViewController {
     public func getExpectedCropImageSize() -> CGSize {
         cropView.getExpectedCropImageSize()
     }
+
+    public func update(_ image: UIImage) {
+        cropView.update(image)
+    }
 }
 
 extension CropViewController: TransformDelegate {

Sources/Mantis/Protocols/CropViewProtocol.swift

@@ -49,6 +49,8 @@ protocol CropViewProtocol: UIView {
     func rotate(by angle: Angle)
     func makeTransformation() -> Transformation
     func makeCropState() -> CropState
+
+    func update(_ image: UIImage)
 }
 
 extension CropViewProtocol {
@@ -58,4 +60,6 @@ extension CropViewProtocol {
     }
 
     func rotate(by angle: Angle) {}
+
+    func update(_ image: UIImage) {}
 }

Sources/Mantis/Protocols/ImageContainerProtocol.swift

@@ -10,4 +10,9 @@ import UIKit
 protocol ImageContainerProtocol: UIView {
     func contains(rect: CGRect, fromView view: UIView, tolerance: CGFloat) -> Bool
     func getCropRegion(withCropBoxFrame cropBoxFrame: CGRect, cropView: UIView) -> CropRegion
+    func update(_ image: UIImage)
+}
+
+extension ImageContainerProtocol {
+    func update(_ image: UIImage) {}
 }