From 7b66a9c022bdff89960fa0ad1c144e46945b30e0 Mon Sep 17 00:00:00 2001
From: or-else <or.else@gmail.com>
Date: Thu, 1 Feb 2024 14:17:45 -0800
Subject: [PATCH] a few fixes for QR code

---
 Tinodios/Base.lproj/Main.storyboard |  6 ++++--
 Tinodios/Utils.swift                | 18 ++++++++++--------
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/Tinodios/Base.lproj/Main.storyboard b/Tinodios/Base.lproj/Main.storyboard
index b9deecd7..7048d792 100644
--- a/Tinodios/Base.lproj/Main.storyboard
+++ b/Tinodios/Base.lproj/Main.storyboard
@@ -2316,8 +2316,9 @@
                                                             <nil key="textColor"/>
                                                             <nil key="highlightedColor"/>
                                                         </label>
-                                                        <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="wXw-YX-QGk" userLabel="Copy">
+                                                        <button opaque="NO" contentMode="scaleAspectFit" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="wXw-YX-QGk" userLabel="Copy">
                                                             <rect key="frame" x="313.66666666666669" y="0.0" width="27.333333333333314" height="44"/>
+                                                            <color key="tintColor" systemColor="secondaryLabelColor"/>
                                                             <inset key="imageEdgeInsets" minX="0.0" minY="0.0" maxX="2.2250738585072014e-308" maxY="0.0"/>
                                                             <state key="normal">
                                                                 <imageReference key="image" image="doc.on.doc" catalog="system" symbolScale="large"/>
@@ -2326,8 +2327,9 @@
                                                                 <action selector="copyTopicID:" destination="ZxW-bT-ZdQ" eventType="touchUpInside" id="0GK-gY-5xc"/>
                                                             </connections>
                                                         </button>
-                                                        <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="aTy-DZ-Bk9" userLabel="QRCode">
+                                                        <button opaque="NO" contentMode="scaleAspectFit" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="aTy-DZ-Bk9" userLabel="QRCode">
                                                             <rect key="frame" x="349" y="0.0" width="25" height="44"/>
+                                                            <color key="tintColor" systemColor="secondaryLabelColor"/>
                                                             <inset key="imageEdgeInsets" minX="0.0" minY="0.0" maxX="2.2250738585072014e-308" maxY="0.0"/>
                                                             <state key="normal">
                                                                 <imageReference key="image" image="qrcode" catalog="system" symbolScale="large"/>
diff --git a/Tinodios/Utils.swift b/Tinodios/Utils.swift
index 3521fb7f..536d5548 100644
--- a/Tinodios/Utils.swift
+++ b/Tinodios/Utils.swift
@@ -133,17 +133,19 @@ public class Utils {
 
     public static func generateQRCode(from string: String) -> UIImage? {
         let data = string.data(using: String.Encoding.ascii)
+        guard let filter = CIFilter(name: "CIQRCodeGenerator") else { return nil }
 
-        if let filter = CIFilter(name: "CIQRCodeGenerator") {
-            filter.setValue(data, forKey: "inputMessage")
-            let transform = CGAffineTransform(scaleX: 3, y: 3)
+        filter.setValue(data, forKey: "inputMessage")
 
-            if let output = filter.outputImage?.transformed(by: transform) {
-                return UIImage(ciImage: output)
-            }
-        }
+        guard let qrcode = filter.outputImage else { return nil }
 
-        return nil
+        // QR code is very small. Scaling it up without smoothing.
+        let scaledImageSize = qrcode.extent.size.applying(CGAffineTransform(scaleX: 3, y: 3))
+        UIGraphicsBeginImageContext(scaledImageSize)
+        let scaledContext = UIGraphicsGetCurrentContext()!
+        scaledContext.interpolationQuality = .none
+        UIImage(ciImage: qrcode).draw(in: CGRect(origin: .zero, size: scaledImageSize))
+        return UIGraphicsGetImageFromCurrentImageContext()!
     }
 }