Use CGColor and remove PlatformColor

Sources/SwiftUIMath/Internal/Display/CGContext+DisplayNode.swift

@@ -5,8 +5,8 @@ import Foundation
 extension CGContext {
   func draw(_ displayNode: Math.DisplayNode, foregroundColor: CGColor) {
     let foregroundColor =
-      displayNode.localTextColor?.cgColor
+      displayNode.localTextColor
-      ?? displayNode.textColor?.cgColor
+      ?? displayNode.textColor
       ?? foregroundColor
 
     switch displayNode {

Sources/SwiftUIMath/Internal/Display/DisplayNode.swift

@@ -9,9 +9,9 @@ extension Math {
     var position: CGPoint = .zero
     var range: NSRange = NSRange(location: 0, length: 0)
     var hasScript: Bool = false
-    var textColor: PlatformColor?
+    var textColor: CGColor?
-    var localTextColor: PlatformColor?
+    var localTextColor: CGColor?
-    var localBackgroundColor: PlatformColor?
+    var localBackgroundColor: CGColor?
 
     func bounds() -> CGRect {
       CGRect(x: position.x, y: position.y - descent, width: width, height: ascent + descent)

Sources/SwiftUIMath/Internal/Display/Typesetter.swift

@@ -1,3 +1,4 @@
+import CoreGraphics
 import CoreText
 import Foundation
 
@@ -423,7 +424,9 @@ extension Math {
       return line
     }
 
-    static var placeholderColor: PlatformColor { PlatformColor.blue }
+    static var placeholderColor: CGColor {
+      CGColor(srgbRed: 0, green: 0, blue: 1, alpha: 1)
+    }
 
     init(
       withFont font: PlatformFont?, style: Style.Level, cramped: Bool, spaced: Bool,
@@ -986,7 +989,7 @@ extension Math {
           let colorAtom = atom as! Color
           let display = Typesetter.createLineForMathList(
             colorAtom.innerList, font: font, style: style, maxWidth: maxWidth)
-          display!.localTextColor = PlatformColor(fromHexString: colorAtom.colorString)
+          display!.localTextColor = CGColor.fromHexString(colorAtom.colorString)
 
           // Check if we need to break before adding this colored content
           let shouldBreak = shouldBreakBeforeDisplay(
@@ -1013,7 +1016,7 @@ extension Math {
           let colorAtom = atom as! TextColor
           let display = Typesetter.createLineForMathList(
             colorAtom.innerList, font: font, style: style, maxWidth: maxWidth)
-          display!.localTextColor = PlatformColor(fromHexString: colorAtom.colorString)
+          display!.localTextColor = CGColor.fromHexString(colorAtom.colorString)
 
           // Check if we need to break before adding this colored content
           let shouldBreak = shouldBreakBeforeDisplay(
@@ -1051,7 +1054,7 @@ extension Math {
           let display = Typesetter.createLineForMathList(
             colorboxAtom.innerList, font: font, style: style, maxWidth: maxWidth)
 
-          display!.localBackgroundColor = PlatformColor(fromHexString: colorboxAtom.colorString)
+          display!.localBackgroundColor = CGColor.fromHexString(colorboxAtom.colorString)
 
           // Check if we need to break before adding this colorbox
           let shouldBreak = shouldBreakBeforeDisplay(
@@ -1387,7 +1390,7 @@ extension Math {
             let color = Typesetter.placeholderColor
             current = NSAttributedString(
               string: atom.nucleus,
-              attributes: [kCTForegroundColorAttributeName as NSAttributedString.Key: color.cgColor]
+              attributes: [kCTForegroundColorAttributeName as NSAttributedString.Key: color]
             )
           } else {
             current = NSAttributedString(string: atom.nucleus)

Sources/SwiftUIMath/Internal/Helpers/CGColor+HexString.swift

@@ -0,0 +1,20 @@
+import CoreGraphics
+import Foundation
+
+extension CGColor {
+  static func fromHexString(_ hexString: String) -> CGColor? {
+    guard !hexString.isEmpty, hexString.hasPrefix("#") else { return nil }
+
+    var rgbValue = UInt64(0)
+    let scanner = Scanner(string: hexString)
+    scanner.charactersToBeSkipped = CharacterSet(charactersIn: "#")
+    guard scanner.scanHexInt64(&rgbValue) else { return nil }
+
+    return CGColor(
+      srgbRed: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
+      green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
+      blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
+      alpha: 1.0
+    )
+  }
+}

Sources/SwiftUIMath/Internal/Helpers/Platform.swift

@@ -1,31 +0,0 @@
-import SwiftUI
-
-#if canImport(UIKit)
-  typealias PlatformColor = UIColor
-  typealias PlatformBezierPath = UIBezierPath
-#elseif canImport(AppKit)
-  typealias PlatformColor = NSColor
-  typealias PlatformBezierPath = NSBezierPath
-#endif
-
-extension PlatformColor {
-  convenience init?(fromHexString hexString: String) {
-    self.init(hexString: hexString)
-  }
-
-  convenience init?(hexString: String) {
-    guard !hexString.isEmpty, hexString.hasPrefix("#") else { return nil }
-
-    var rgbValue = UInt64(0)
-    let scanner = Scanner(string: hexString)
-    scanner.charactersToBeSkipped = CharacterSet(charactersIn: "#")
-    guard scanner.scanHexInt64(&rgbValue) else { return nil }
-
-    self.init(
-      red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
-      green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
-      blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
-      alpha: 1.0
-    )
-  }
-}