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+////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2018 Leo Tenenbaum
+// This file is part of GraphColoring.
+//
+// GraphColoring is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GraphColoring is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GraphColoring.  If not, see <https://www.gnu.org/licenses/>.
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef GRAPHCOLORING_GUI_COLORS_H_
+#define GRAPHCOLORING_GUI_COLORS_H_
+
+#include <cstdint>
+#include <string>
+
+#include "pugi/pugixml.hpp"
+
+namespace gui {
+
+typedef uint32_t Color;
+
+namespace colors {
+
+// Color constants
+static constexpr Color WHITE =   0xFFFFFFFF;
+static constexpr Color BLACK =   0x000000FF;
+static constexpr Color RED =     0xFF0000FF;
+static constexpr Color GREEN =   0x00FF00FF;
+static constexpr Color BLUE =    0x0000FFFF;
+static constexpr Color YELLOW =  0xFFFF00FF;
+static constexpr Color CYAN =    0x00FFFFFF;
+static constexpr Color MAGENTA = 0xFF00FFFF;
+
+extern void Unpack(Color color,
+    uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a); // 32-bit color => 8-bit channels
+extern Color Pack(uint8_t r, uint8_t g, uint8_t b, uint8_t a); // 8-bit channels => 32-bit color
+extern Color Shade(Color color, double factor);
+extern Color Light(Color color);
+extern Color Dark(Color color);
+extern Color FromString(const std::string& str); // Reads #FF00AA or #AA33FFCC
+extern Color FromAttribute(pugi::xml_attribute attr);
+
+} // namespace colors
+} // namespace gui
+
+#endif // GRAPHCOLORING_GUI_COLORS_H_