# Compile time hexcolor support ported from palladium

include/amethyst/color.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <amethyst/types.hpp>
+#include <amethyst/utils.hpp>
 
 // We all know where the code is from ... RenderD7 -> Palladium/Amy
 
@@ -47,14 +48,27 @@ class Color {
    * Constructor for Hex Input
    * @param hex Hex String in `#ffffff` or `#ffffffff` format
    */
-  Color(const std::string& hex) { Hex(hex); }
+  constexpr Color(const std::string& hex) { Hex(hex); }
 
   /**
    * Create Color Object by Hex String
    * @param hex Hex String in `#ffffff` or `#ffffffff` format
    * @return Color class itself
    */
-  Color& Hex(const std::string& hex);
+  constexpr Color& Hex(const std::string& hex) {
+    if (!(hex.length() == 7 || hex.length() == 9)) {
+      throw "[PD] Color: hex string is not rgb or rgba!";
+    }
+    r = Utils::HexChar2Int(hex[1]) * 16 + Utils::HexChar2Int(hex[2]);
+    g = Utils::HexChar2Int(hex[3]) * 16 + Utils::HexChar2Int(hex[4]);
+    b = Utils::HexChar2Int(hex[5]) * 16 + Utils::HexChar2Int(hex[6]);
+    if (hex.length() == 9) {
+      a = Utils::HexChar2Int(hex[7]) * 16 + Utils::HexChar2Int(hex[8]);
+    } else {
+      a = 255;
+    }
+    return *this;
+  }
   /**
    * Convert this Color Object to Hex string
    * @param rgba [default false] sets if 8 or 6 digit color should be returned

include/amethyst/utils.hpp

@@ -8,6 +8,13 @@ class Error : public std::runtime_error {
   Error(ksr str) : std::runtime_error("[amy] " + str) {}
 };
 namespace Utils {
+constexpr int HexChar2Int(char c) {
+  /** Imagine man hat ne lookup table dafür verwendet :/ */
+  if (c >= '0' && c <= '9') return c - '0';
+  if (c >= 'a' && c <= 'f') return 10 + (c - 'a');
+  if (c >= 'A' && c <= 'F') return 10 + (c - 'A');
+  return -1;  // Error
+}
 vec<uc> LoadFile2Mem(ksr path);
 str FormatBytes(ull bytes);
 ui HashMemory(kvr<uc> data);