From facf039f972eeeb327f6d21eb94af3bbfa7f05b4 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Wed, 8 Jun 2022 17:12:53 -0400
Subject: [PATCH] Live text in gallery view

---
 .../Large Image/LargeImageContentView.swift   | 32 +++++++++++++++++--
 .../LoadingLargeImageViewController.swift     |  6 ++--
 2 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/Tusker/Screens/Large Image/LargeImageContentView.swift b/Tusker/Screens/Large Image/LargeImageContentView.swift
index 5f7e335409..d9ca289768 100644
--- a/Tusker/Screens/Large Image/LargeImageContentView.swift	
+++ b/Tusker/Screens/Large Image/LargeImageContentView.swift	
@@ -9,6 +9,7 @@
 import UIKit
 import Pachyderm
 import AVFoundation
+import VisionKit
 
 protocol LargeImageContentView: UIView {
     var animationImage: UIImage? { get }
@@ -16,7 +17,10 @@ protocol LargeImageContentView: UIView {
     func grayscaleStateChanged()
 }
 
-class LargeImageImageContentView: GIFImageView, LargeImageContentView {
+class LargeImageImageContentView: UIImageView, LargeImageContentView, ImageAnalysisInteractionDelegate {
+    
+    @available(iOS 16.0, *)
+    private static let analyzer = ImageAnalyzer()
     
     var animationImage: UIImage? { image! }
     
@@ -25,13 +29,31 @@ class LargeImageImageContentView: GIFImageView, LargeImageContentView {
     }
     
     private var sourceData: Data?
+    private weak var owner: UIViewController?
     
-    
-    init(image: UIImage) {
+    init(image: UIImage, owner: UIViewController?) {
+        self.owner = owner
+        
         super.init(image: image)
         
         contentMode = .scaleAspectFit
+        isUserInteractionEnabled = true
         
+        if #available(iOS 16.0, *),
+           ImageAnalyzer.isSupported {
+            let interaction = ImageAnalysisInteraction()
+            interaction.delegate = self
+            interaction.preferredInteractionTypes = .automatic
+            addInteraction(interaction)
+            Task {
+                do {
+                    let result = try await LargeImageImageContentView.analyzer.analyze(image, configuration: ImageAnalyzer.Configuration([.text, .machineReadableCode]))
+                    interaction.analysis = result
+                } catch {
+                    // if analysis fails, we just don't show anything
+                }
+            }
+        }
     }
     
     required init?(coder: NSCoder) {
@@ -54,6 +76,10 @@ class LargeImageImageContentView: GIFImageView, LargeImageContentView {
             self.image = image
         }
     }
+    
+    func presentingViewController(for interaction: ImageAnalysisInteraction) -> UIViewController? {
+        return owner
+    }
 }
 
 class LargeImageGifContentView: GIFImageView, LargeImageContentView {
diff --git a/Tusker/Screens/Large Image/LoadingLargeImageViewController.swift b/Tusker/Screens/Large Image/LoadingLargeImageViewController.swift
index 487889b66b..1b0c2e687e 100644
--- a/Tusker/Screens/Large Image/LoadingLargeImageViewController.swift	
+++ b/Tusker/Screens/Large Image/LoadingLargeImageViewController.swift	
@@ -138,9 +138,9 @@ class LoadingLargeImageViewController: UIViewController, LargeImageAnimatableVie
             content = LargeImageGifContentView(gifController: gifController)
         } else {
             if let transformedImage = ImageGrayscalifier.convertIfNecessary(url: url, image: image) {
-                content = LargeImageImageContentView(image: transformedImage)
+                content = LargeImageImageContentView(image: transformedImage, owner: self)
             } else {
-                content = LargeImageImageContentView(image: image)
+                content = LargeImageImageContentView(image: image, owner: self)
             }
         }
         
@@ -167,7 +167,7 @@ class LoadingLargeImageViewController: UIViewController, LargeImageAnimatableVie
            let grayscale = ImageGrayscalifier.convert(url: nil, cgImage: source) {
             image = grayscale
         }
-        setContent(LargeImageImageContentView(image: image))
+        setContent(LargeImageImageContentView(image: image, owner: self))
     }
     
 }