Fix build on macOS

Author: kean

Sources/Pulse/Helpers/ImageProcessor.swift

@@ -19,8 +19,14 @@ import ImageIO
 #endif
 
 enum Graphics {
-    static func resize(_ image: UIImage, to size: CGSize) -> PlatformImage? {
-#if os(macOS)
+    static func resize(_ image: PlatformImage, to size: CGSize) -> PlatformImage? {
+#if canImport(UIKit)
+        UIGraphicsBeginImageContextWithOptions(size, false, 1.0)
+        image.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
+        let thumbnail = UIGraphicsGetImageFromCurrentImageContext()
+        UIGraphicsEndImageContext()
+        return thumbnail
+#elseif canImport(AppKit)
         let newImage = NSImage(size: newSize)
         newImage.lockFocus()
         let sourceRect = NSMakeRect(0, 0, size.width, size.height)
@@ -29,11 +35,7 @@ enum Graphics {
         newImage.unlockFocus()
         return newImage
 #else
-        UIGraphicsBeginImageContextWithOptions(size, false, 1.0)
-        image.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
-        let thumbnail = UIGraphicsGetImageFromCurrentImageContext()
-        UIGraphicsEndImageContext()
-        return thumbnail
+        return image
 #endif
     }