diff -r 000000000000 -r 6474c204b198 gfx/src/nsColor.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/src/nsColor.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,86 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsColor_h___
+#define nsColor_h___
+
+#include <stddef.h>                     // for size_t
+#include <stdint.h>                     // for uint8_t, uint32_t
+#include "gfxCore.h"                    // for NS_GFX_
+#include "nscore.h"                     // for nsAString
+
+class nsAString;
+class nsString;
+class nsCString;
+
+// A color is a 32 bit unsigned integer with four components: R, G, B
+// and A.
+typedef uint32_t nscolor;
+
+// Make a color out of r,g,b values. This assumes that the r,g,b values are
+// properly constrained to 0-255. This also assumes that a is 255.
+#define NS_RGB(_r,_g,_b) \
+  ((nscolor) ((255 << 24) | ((_b)<<16) | ((_g)<<8) | (_r)))
+
+// Make a color out of r,g,b,a values. This assumes that the r,g,b,a
+// values are properly constrained to 0-255.
+#define NS_RGBA(_r,_g,_b,_a) \
+  ((nscolor) (((_a) << 24) | ((_b)<<16) | ((_g)<<8) | (_r)))
+
+// Extract color components from nscolor
+#define NS_GET_R(_rgba) ((uint8_t) ((_rgba) & 0xff))
+#define NS_GET_G(_rgba) ((uint8_t) (((_rgba) >> 8) & 0xff))
+#define NS_GET_B(_rgba) ((uint8_t) (((_rgba) >> 16) & 0xff))
+#define NS_GET_A(_rgba) ((uint8_t) (((_rgba) >> 24) & 0xff))
+
+// Fast approximate division by 255. It has the property that
+// for all 0 <= n <= 255*255, FAST_DIVIDE_BY_255(n) == n/255.
+// But it only uses two adds and two shifts instead of an 
+// integer division (which is expensive on many processors).
+//
+// equivalent to target=v/255
+#define FAST_DIVIDE_BY_255(target,v)               \
+  PR_BEGIN_MACRO                                   \
+    unsigned tmp_ = v;                             \
+    target = ((tmp_ << 8) + tmp_ + 255) >> 16;     \
+  PR_END_MACRO
+
+// Translate a hex string to a color. Return true if it parses ok,
+// otherwise return false.
+// This accepts only 3 or 6 digits
+NS_GFX_(bool) NS_HexToRGB(const nsAString& aBuf, nscolor* aResult);
+
+// Compose one NS_RGB color onto another. The result is what
+// you get if you draw aFG on top of aBG with operator OVER.
+NS_GFX_(nscolor) NS_ComposeColors(nscolor aBG, nscolor aFG);
+
+// Translate a hex string to a color. Return true if it parses ok,
+// otherwise return false.
+// This version accepts 1 to 9 digits (missing digits are 0)
+NS_GFX_(bool) NS_LooseHexToRGB(const nsString& aBuf, nscolor* aResult);
+
+// There is no function to translate a color to a hex string, because
+// the hex-string syntax does not support transparency.
+
+// Translate a color name to a color. Return true if it parses ok,
+// otherwise return false.
+NS_GFX_(bool) NS_ColorNameToRGB(const nsAString& aBuf, nscolor* aResult);
+
+// Returns an array of all possible color names, and sets
+// *aSizeArray to the size of that array. Do NOT call |free()| on this array.
+NS_GFX_(const char * const *) NS_AllColorNames(size_t *aSizeArray);
+
+// function to convert from HSL color space to RGB color space
+// the float parameters are all expected to be in the range 0-1
+NS_GFX_(nscolor) NS_HSL2RGB(float h, float s, float l);
+
+// Return a color name for the given nscolor.  If there is no color
+// name for it, returns null.  If there are multiple possible color
+// names for the given color, the first one in nsColorNameList.h
+// (which is generally the first one in alphabetical order) will be
+// returned.
+NS_GFX_(const char*) NS_RGBToColorName(nscolor aColor);
+
+#endif /* nsColor_h___ */