Add m-esr52 at 52.6.0

1 files changed, 123 insertions, 0 deletions

diff --git a/gfx/src/nsColor.h b/gfx/src/nsColor.h
new file mode 100644
index 000000000..2f21c91bf
--- /dev/null
+++ b/gfx/src/nsColor.h
@@ -0,0 +1,123 @@
+/* -*- 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 "nscore.h"                     // for nsAString
+#include "nsCoord.h"                    // for NSToIntRound
+
+class nsAString;
+class nsString;
+
+// 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))
+
+namespace mozilla {
+
+template<typename T>
+inline uint8_t ClampColor(T aColor)
+{
+  if (aColor >= 255) {
+    return 255;
+  }
+  if (aColor <= 0) {
+    return 0;
+  }
+  return NSToIntRound(aColor);
+}
+
+} // namespace mozilla
+
+// 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
+
+enum class nsHexColorType : uint8_t {
+  NoAlpha, // 3 or 6 digit hex colors only
+  AllowAlpha, // 3, 4, 6, or 8 digit hex colors
+};
+
+// Translate a hex string to a color. Return true if it parses ok,
+// otherwise return false.
+// This accepts the number of digits specified by aType.
+bool
+NS_HexToRGBA(const nsAString& aBuf, nsHexColorType aType, 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.
+nscolor NS_ComposeColors(nscolor aBG, nscolor aFG);
+
+namespace mozilla {
+
+inline uint32_t RoundingDivideBy255(uint32_t n)
+{
+  // There is an approximate alternative: ((n << 8) + n + 32896) >> 16
+  // But that is actually slower than this simple expression on a modern
+  // machine with a modern compiler.
+  return (n + 127) / 255;
+}
+
+// Blend one RGBA color with another based on a given ratio.
+// It is a linear interpolation on each channel with alpha premultipled.
+nscolor LinearBlendColors(nscolor aBg, nscolor aFg, uint_fast8_t aFgRatio);
+
+} // namespace mozilla
+
+// 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)
+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.
+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.
+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
+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.
+const char* NS_RGBToColorName(nscolor aColor);
+
+#endif /* nsColor_h___ */