Added pinch inset generator

Author: dagronf

Sources/QRCode/styles/data/pixel/inset-generator/QRCodePixelShapeInset+Generator.swift

@@ -54,6 +54,7 @@ extension QRCode {
 		@objc public static let generators: [QRCodePixelInsetGenerator.Type] = [
 			QRCode.PixelInset.Fixed.self,
 			QRCode.PixelInset.Random.self,
+			QRCode.PixelInset.Pinch.self,
 			QRCode.PixelInset.Punch.self,
 			QRCode.PixelInset.HorizontalWave.self,
 			QRCode.PixelInset.VerticalWave.self,

Sources/QRCode/styles/data/pixel/inset-generator/QRCodePixelShapeInset+Pinch.swift

@@ -0,0 +1,42 @@
+//
+//  Copyright © 2025 Darren Ford. All rights reserved.
+//
+//  MIT license
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
+//  documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
+//  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+//  permit persons to whom the Software is furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all copies or substantial
+//  portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+//  WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+//  OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+//  OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+import CoreGraphics
+import Foundation
+
+public extension QRCode.PixelInset {
+	/// A pixel inset generator that creates a bigger inset the closer to the center of the QR code
+	@objc(QRCodePixelInsetPinch)
+	class Pinch: NSObject, QRCodePixelInsetGenerator {
+		public static var Name: String { "pinch" }
+		public static func Create() -> QRCodePixelInsetGenerator { QRCode.PixelInset.Pinch() }
+		public func reset() {}
+		public func copyInsetGenerator() -> QRCodePixelInsetGenerator { QRCode.PixelInset.Pinch() }
+		public func insetValue(for matrix: BoolMatrix, row: Int, column: Int, insetFraction: CGFloat) -> CGFloat {
+			assert(insetFraction.in(0 ... 1))
+			let half = Double(matrix.dimension) / 2
+
+			let cc = Double(column) - half
+			let cr = Double(row) - half
+
+			let len = sqrt(cc*cc + cr*cr) / half
+			return len * insetFraction
+		}
+	}
+}

Sources/QRCode/styles/data/pixel/inset-generator/QRCodePixelShapeInset+Punch.swift

@@ -21,7 +21,7 @@ import CoreGraphics
 import Foundation
 
 public extension QRCode.PixelInset {
-	/// A pixel inset generator that creates a bigger inset the closer to the center of the QR code
+	/// A pixel inset generator that creates a bigger inset the closer to the edge of the QR code
 	@objc(QRCodePixelInsetPunch)
 	class Punch: NSObject, QRCodePixelInsetGenerator {
 		public static var Name: String { "punch" }