From 0b13efd0b5e4c2d6c591955b4b328290e100e148 Mon Sep 17 00:00:00 2001
From: JonKazama-Hellion <f.wathling@gmail.com>
Date: Tue, 5 May 2026 10:21:46 +0200
Subject: [PATCH] feat(util): add HexToRgba parser for theme JSON

---
 HellionChat/Util/ColourUtil.cs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/HellionChat/Util/ColourUtil.cs b/HellionChat/Util/ColourUtil.cs
index 63214f0..3373700 100755
--- a/HellionChat/Util/ColourUtil.cs
+++ b/HellionChat/Util/ColourUtil.cs
@@ -62,4 +62,20 @@ internal static class ColourUtil {
 
         return ((uint) a << 24) | ((uint) nb << 16) | ((uint) ng << 8) | nr;
     }
+
+    public static uint HexToRgba(string hex)
+    {
+        ArgumentNullException.ThrowIfNull(hex);
+        var s = hex.StartsWith('#') ? hex[1..] : hex;
+        if (s.Length != 6 && s.Length != 8)
+            throw new FormatException($"Hex colour must be 6 or 8 hex digits, got {s.Length}: '{hex}'");
+
+        if (!uint.TryParse(s, System.Globalization.NumberStyles.HexNumber, System.Globalization.CultureInfo.InvariantCulture, out var value))
+            throw new FormatException($"Hex colour '{hex}' is not a valid hexadecimal value");
+
+        if (s.Length == 6)
+            value = (value << 8) | 0xFFu;  // RRGGBB → RRGGBBFF
+
+        return value;
+    }
 }