X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=src%2Fvideo%2Fcolor.hpp;h=f0bd76d6b0ee87e78802b7823c521a96d81f4146;hb=4f423b9bbb6fa694b8c6bcc338e069aad45db3e3;hp=391c929d47e82c6a8742c8952f52468f018836ea;hpb=5fce9cfaf7f90280e86e15b1595f111e645f7343;p=supertux.git

diff --git a/src/video/color.hpp b/src/video/color.hpp
index 391c929d4..f0bd76d6b 100644
--- a/src/video/color.hpp
+++ b/src/video/color.hpp
@@ -52,6 +52,12 @@ public:
 #endif
   }
 
+  bool operator==(const Color& other) const
+  {
+    return red == other.red && green == other.green && blue == other.blue
+           && alpha == other.alpha;
+  }
+
   void check_color_ranges()
   {
     if(red < 0 || red > 1.0 || green < 0 || green > 1.0
@@ -60,7 +66,26 @@ public:
       log_warning << "color value out of range: " << red << ", " << green << ", " << blue << ", " << alpha << std::endl;
   }
 
+  float greyscale() const
+  {
+    return red * 0.30 + green * 0.59 + blue * 0.11;
+  }
+
+  bool operator < (const Color& other) const
+  {
+    return greyscale() < other.greyscale();
+  }
+
   float red, green, blue, alpha;
+
+  static const Color BLACK;
+  static const Color RED;
+  static const Color GREEN;
+  static const Color BLUE;
+  static const Color CYAN;
+  static const Color MAGENTA;
+  static const Color YELLOW;
+  static const Color WHITE;
 };
 
 #endif