Moved the AColor type to a gfx/ header, so other code can use it.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@847 0fc631ac-6414-0410-93d0-97cfa31319b6

src/gfx/color.hpp

@@ -0,0 +1,62 @@
+//+----------------------------------------------------------------------------+
+//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
+//| Copyright:    (C) 2001 - 2008 Twan van Laarhoven and "coppro"              |
+//| License:      GNU General Public License 2 or later (see file COPYING)     |
+//+----------------------------------------------------------------------------+
+
+#ifndef HEADER_GFX_COLOR
+#define HEADER_GFX_COLOR
+
+/** @file gfx/color.hpp
+ *
+ *  Color related functions and types.
+ */
+
+// ----------------------------------------------------------------------------- : Includes
+
+#include <util/prec.hpp>
+
+// ----------------------------------------------------------------------------- : Color with alpha
+
+/// Color with alpha channel
+class AColor : public Color {
+  public:
+	Byte alpha;	///< The alpha value, in the range [0..255]
+	inline AColor()                                     :               alpha(0) {}
+	inline AColor(Byte r, Byte g, Byte b, Byte a = 255) : Color(r,g,b), alpha(a) {}
+	inline AColor(const Color& color,     Byte a = 255) : Color(color), alpha(a) {}
+};
+
+// ----------------------------------------------------------------------------- : Parsing
+
+/// Parse a color
+Color parse_color(const String& value);
+
+/// Parse a color with alpha
+AColor parse_acolor(const String& value);
+
+// ----------------------------------------------------------------------------- : Color utility functions
+
+inline int bot(int x) { return max(0,   x); } ///< bottom range check for color values
+inline int top(int x) { return min(255, x); } ///< top    range check for color values
+inline int col(int x) { return top(bot(x)); } ///< top and bottom range check for color values
+
+/// Linear interpolation between colors
+Color lerp(const Color& a, const Color& b, double t);
+/// Linear interpolation between colors
+AColor lerp(const AColor& a, const AColor& b, double t);
+
+/// convert HSL to RGB, h,s,l must be in range [0...1)
+Color hsl2rgb(double h, double s, double l);
+
+/// A darker version of a color
+Color darken(const Color& c);
+
+/// A saturated version of a color
+Color saturate(const Color& c, double amount);
+
+/// Fills an image with the specified color
+void fill_image(Image& image, const Color& color);
+
+// ----------------------------------------------------------------------------- : EOF
+#endif