diff -r 000000000000 -r 6474c204b198 layout/style/nsStyleCoord.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/nsStyleCoord.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,347 @@
+/* -*- 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/. */
+
+/* representation of length values in computed style data */
+
+#include "nsStyleCoord.h"
+#include "mozilla/HashFunctions.h"
+
+nsStyleCoord::nsStyleCoord(nsStyleUnit aUnit)
+  : mUnit(aUnit)
+{
+  NS_ASSERTION(aUnit < eStyleUnit_Percent, "not a valueless unit");
+  if (aUnit >= eStyleUnit_Percent) {
+    mUnit = eStyleUnit_Null;
+  }
+  mValue.mInt = 0;
+}
+
+nsStyleCoord::nsStyleCoord(int32_t aValue, nsStyleUnit aUnit)
+  : mUnit(aUnit)
+{
+  //if you want to pass in eStyleUnit_Coord, don't. instead, use the
+  //constructor just above this one... MMP
+  NS_ASSERTION((aUnit == eStyleUnit_Enumerated) ||
+               (aUnit == eStyleUnit_Integer), "not an int value");
+  if ((aUnit == eStyleUnit_Enumerated) ||
+      (aUnit == eStyleUnit_Integer)) {
+    mValue.mInt = aValue;
+  }
+  else {
+    mUnit = eStyleUnit_Null;
+    mValue.mInt = 0;
+  }
+}
+
+nsStyleCoord::nsStyleCoord(float aValue, nsStyleUnit aUnit)
+  : mUnit(aUnit)
+{
+  if (aUnit < eStyleUnit_Percent || aUnit >= eStyleUnit_Coord) {
+    NS_NOTREACHED("not a float value");
+    Reset();
+  } else {
+    mValue.mFloat = aValue;
+  }
+}
+
+bool nsStyleCoord::operator==(const nsStyleCoord& aOther) const
+{
+  if (mUnit != aOther.mUnit) {
+    return false;
+  }
+  switch (mUnit) {
+    case eStyleUnit_Null:
+    case eStyleUnit_Normal:
+    case eStyleUnit_Auto:
+    case eStyleUnit_None:
+      return true;
+    case eStyleUnit_Percent:
+    case eStyleUnit_Factor:
+    case eStyleUnit_Degree:
+    case eStyleUnit_Grad:
+    case eStyleUnit_Radian:
+    case eStyleUnit_Turn:
+    case eStyleUnit_FlexFraction:
+      return mValue.mFloat == aOther.mValue.mFloat;
+    case eStyleUnit_Coord:
+    case eStyleUnit_Integer:
+    case eStyleUnit_Enumerated:
+      return mValue.mInt == aOther.mValue.mInt;
+    case eStyleUnit_Calc:
+      return *this->GetCalcValue() == *aOther.GetCalcValue();
+  }
+  NS_ABORT_IF_FALSE(false, "unexpected unit");
+  return false;
+}
+
+uint32_t nsStyleCoord::HashValue(uint32_t aHash = 0) const
+{
+  aHash = mozilla::AddToHash(aHash, mUnit);
+
+  switch (mUnit) {
+    case eStyleUnit_Null:
+    case eStyleUnit_Normal:
+    case eStyleUnit_Auto:
+    case eStyleUnit_None:
+      return mozilla::AddToHash(aHash, true);
+    case eStyleUnit_Percent:
+    case eStyleUnit_Factor:
+    case eStyleUnit_Degree:
+    case eStyleUnit_Grad:
+    case eStyleUnit_Radian:
+    case eStyleUnit_Turn:
+    case eStyleUnit_FlexFraction:
+      return mozilla::AddToHash(aHash, mValue.mFloat);
+    case eStyleUnit_Coord:
+    case eStyleUnit_Integer:
+    case eStyleUnit_Enumerated:
+      return mozilla::AddToHash(aHash, mValue.mInt);
+    case eStyleUnit_Calc:
+      Calc* calcValue = GetCalcValue();
+      aHash = mozilla::AddToHash(aHash, calcValue->mLength);
+      if (HasPercent()) {
+        return mozilla::AddToHash(aHash, calcValue->mPercent);
+      }
+      return aHash;
+  }
+  NS_ABORT_IF_FALSE(false, "unexpected unit");
+  return aHash;
+}
+
+void nsStyleCoord::Reset()
+{
+  mUnit = eStyleUnit_Null;
+  mValue.mInt = 0;
+}
+
+void nsStyleCoord::SetCoordValue(nscoord aValue)
+{
+  mUnit = eStyleUnit_Coord;
+  mValue.mInt = aValue;
+}
+
+void nsStyleCoord::SetIntValue(int32_t aValue, nsStyleUnit aUnit)
+{
+  NS_ASSERTION((aUnit == eStyleUnit_Enumerated) ||
+               (aUnit == eStyleUnit_Integer), "not an int value");
+  if ((aUnit == eStyleUnit_Enumerated) ||
+      (aUnit == eStyleUnit_Integer)) {
+    mUnit = aUnit;
+    mValue.mInt = aValue;
+  }
+  else {
+    Reset();
+  }
+}
+
+void nsStyleCoord::SetPercentValue(float aValue)
+{
+  mUnit = eStyleUnit_Percent;
+  mValue.mFloat = aValue;
+}
+
+void nsStyleCoord::SetFactorValue(float aValue)
+{
+  mUnit = eStyleUnit_Factor;
+  mValue.mFloat = aValue;
+}
+
+void nsStyleCoord::SetAngleValue(float aValue, nsStyleUnit aUnit)
+{
+  if (aUnit == eStyleUnit_Degree ||
+      aUnit == eStyleUnit_Grad ||
+      aUnit == eStyleUnit_Radian ||
+      aUnit == eStyleUnit_Turn) {
+    mUnit = aUnit;
+    mValue.mFloat = aValue;
+  } else {
+    NS_NOTREACHED("not an angle value");
+    Reset();
+  }
+}
+
+void nsStyleCoord::SetFlexFractionValue(float aValue)
+{
+  mUnit = eStyleUnit_FlexFraction;
+  mValue.mFloat = aValue;
+}
+
+void nsStyleCoord::SetCalcValue(Calc* aValue)
+{
+  mUnit = eStyleUnit_Calc;
+  mValue.mPointer = aValue;
+}
+
+void nsStyleCoord::SetNormalValue()
+{
+  mUnit = eStyleUnit_Normal;
+  mValue.mInt = 0;
+}
+
+void nsStyleCoord::SetAutoValue()
+{
+  mUnit = eStyleUnit_Auto;
+  mValue.mInt = 0;
+}
+
+void nsStyleCoord::SetNoneValue()
+{
+  mUnit = eStyleUnit_None;
+  mValue.mInt = 0;
+}
+
+// accessors that are not inlined
+
+double
+nsStyleCoord::GetAngleValueInRadians() const
+{
+  double angle = mValue.mFloat;
+
+  switch (GetUnit()) {
+  case eStyleUnit_Radian: return angle;
+  case eStyleUnit_Turn:   return angle * 2 * M_PI;
+  case eStyleUnit_Degree: return angle * M_PI / 180.0;
+  case eStyleUnit_Grad:   return angle * M_PI / 200.0;
+
+  default:
+    NS_NOTREACHED("unrecognized angular unit");
+    return 0.0;
+  }
+}
+
+nsStyleSides::nsStyleSides()
+{
+  memset(this, 0x00, sizeof(nsStyleSides));
+}
+
+bool nsStyleSides::operator==(const nsStyleSides& aOther) const
+{
+  NS_FOR_CSS_SIDES(i) {
+    if (nsStyleCoord(mValues[i], (nsStyleUnit)mUnits[i]) !=
+        nsStyleCoord(aOther.mValues[i], (nsStyleUnit)aOther.mUnits[i])) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void nsStyleSides::Reset()
+{
+  memset(this, 0x00, sizeof(nsStyleSides));
+}
+
+nsStyleCorners::nsStyleCorners()
+{
+  memset(this, 0x00, sizeof(nsStyleCorners));
+}
+
+bool
+nsStyleCorners::operator==(const nsStyleCorners& aOther) const
+{
+  NS_FOR_CSS_HALF_CORNERS(i) {
+    if (nsStyleCoord(mValues[i], (nsStyleUnit)mUnits[i]) !=
+        nsStyleCoord(aOther.mValues[i], (nsStyleUnit)aOther.mUnits[i])) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void nsStyleCorners::Reset()
+{
+  memset(this, 0x00, sizeof(nsStyleCorners));
+}
+
+// Validation of NS_SIDE_IS_VERTICAL and NS_HALF_CORNER_IS_X.
+#define CASE(side, result)                                                    \
+  static_assert(NS_SIDE_IS_VERTICAL(side) == result,                      \
+                "NS_SIDE_IS_VERTICAL is wrong")
+CASE(NS_SIDE_TOP,    false);
+CASE(NS_SIDE_RIGHT,  true);
+CASE(NS_SIDE_BOTTOM, false);
+CASE(NS_SIDE_LEFT,   true);
+#undef CASE
+
+#define CASE(corner, result)                                                  \
+  static_assert(NS_HALF_CORNER_IS_X(corner) == result,                    \
+                "NS_HALF_CORNER_IS_X is wrong")
+CASE(NS_CORNER_TOP_LEFT_X,     true);
+CASE(NS_CORNER_TOP_LEFT_Y,     false);
+CASE(NS_CORNER_TOP_RIGHT_X,    true);
+CASE(NS_CORNER_TOP_RIGHT_Y,    false);
+CASE(NS_CORNER_BOTTOM_RIGHT_X, true);
+CASE(NS_CORNER_BOTTOM_RIGHT_Y, false);
+CASE(NS_CORNER_BOTTOM_LEFT_X,  true);
+CASE(NS_CORNER_BOTTOM_LEFT_Y,  false);
+#undef CASE
+
+// Validation of NS_HALF_TO_FULL_CORNER.
+#define CASE(corner, result)                                                  \
+  static_assert(NS_HALF_TO_FULL_CORNER(corner) == result,                 \
+                "NS_HALF_TO_FULL_CORNER is wrong")
+CASE(NS_CORNER_TOP_LEFT_X,     NS_CORNER_TOP_LEFT);
+CASE(NS_CORNER_TOP_LEFT_Y,     NS_CORNER_TOP_LEFT);
+CASE(NS_CORNER_TOP_RIGHT_X,    NS_CORNER_TOP_RIGHT);
+CASE(NS_CORNER_TOP_RIGHT_Y,    NS_CORNER_TOP_RIGHT);
+CASE(NS_CORNER_BOTTOM_RIGHT_X, NS_CORNER_BOTTOM_RIGHT);
+CASE(NS_CORNER_BOTTOM_RIGHT_Y, NS_CORNER_BOTTOM_RIGHT);
+CASE(NS_CORNER_BOTTOM_LEFT_X,  NS_CORNER_BOTTOM_LEFT);
+CASE(NS_CORNER_BOTTOM_LEFT_Y,  NS_CORNER_BOTTOM_LEFT);
+#undef CASE
+
+// Validation of NS_FULL_TO_HALF_CORNER.
+#define CASE(corner, vert, result)                                            \
+  static_assert(NS_FULL_TO_HALF_CORNER(corner, vert) == result,           \
+                "NS_FULL_TO_HALF_CORNER is wrong")
+CASE(NS_CORNER_TOP_LEFT,     false, NS_CORNER_TOP_LEFT_X);
+CASE(NS_CORNER_TOP_LEFT,     true,  NS_CORNER_TOP_LEFT_Y);
+CASE(NS_CORNER_TOP_RIGHT,    false, NS_CORNER_TOP_RIGHT_X);
+CASE(NS_CORNER_TOP_RIGHT,    true,  NS_CORNER_TOP_RIGHT_Y);
+CASE(NS_CORNER_BOTTOM_RIGHT, false, NS_CORNER_BOTTOM_RIGHT_X);
+CASE(NS_CORNER_BOTTOM_RIGHT, true,  NS_CORNER_BOTTOM_RIGHT_Y);
+CASE(NS_CORNER_BOTTOM_LEFT,  false, NS_CORNER_BOTTOM_LEFT_X);
+CASE(NS_CORNER_BOTTOM_LEFT,  true,  NS_CORNER_BOTTOM_LEFT_Y);
+#undef CASE
+
+// Validation of NS_SIDE_TO_{FULL,HALF}_CORNER.
+#define CASE(side, second, result)                                            \
+  static_assert(NS_SIDE_TO_FULL_CORNER(side, second) == result,           \
+                "NS_SIDE_TO_FULL_CORNER is wrong")
+CASE(NS_SIDE_TOP,    false, NS_CORNER_TOP_LEFT);
+CASE(NS_SIDE_TOP,    true,  NS_CORNER_TOP_RIGHT);
+
+CASE(NS_SIDE_RIGHT,  false, NS_CORNER_TOP_RIGHT);
+CASE(NS_SIDE_RIGHT,  true,  NS_CORNER_BOTTOM_RIGHT);
+
+CASE(NS_SIDE_BOTTOM, false, NS_CORNER_BOTTOM_RIGHT);
+CASE(NS_SIDE_BOTTOM, true,  NS_CORNER_BOTTOM_LEFT);
+
+CASE(NS_SIDE_LEFT,   false, NS_CORNER_BOTTOM_LEFT);
+CASE(NS_SIDE_LEFT,   true,  NS_CORNER_TOP_LEFT);
+#undef CASE
+
+#define CASE(side, second, parallel, result)                                  \
+  static_assert(NS_SIDE_TO_HALF_CORNER(side, second, parallel) == result, \
+                "NS_SIDE_TO_HALF_CORNER is wrong")
+CASE(NS_SIDE_TOP,    false, true,  NS_CORNER_TOP_LEFT_X);
+CASE(NS_SIDE_TOP,    false, false, NS_CORNER_TOP_LEFT_Y);
+CASE(NS_SIDE_TOP,    true,  true,  NS_CORNER_TOP_RIGHT_X);
+CASE(NS_SIDE_TOP,    true,  false, NS_CORNER_TOP_RIGHT_Y);
+
+CASE(NS_SIDE_RIGHT,  false, false, NS_CORNER_TOP_RIGHT_X);
+CASE(NS_SIDE_RIGHT,  false, true,  NS_CORNER_TOP_RIGHT_Y);
+CASE(NS_SIDE_RIGHT,  true,  false, NS_CORNER_BOTTOM_RIGHT_X);
+CASE(NS_SIDE_RIGHT,  true,  true,  NS_CORNER_BOTTOM_RIGHT_Y);
+
+CASE(NS_SIDE_BOTTOM, false, true,  NS_CORNER_BOTTOM_RIGHT_X);
+CASE(NS_SIDE_BOTTOM, false, false, NS_CORNER_BOTTOM_RIGHT_Y);
+CASE(NS_SIDE_BOTTOM, true,  true,  NS_CORNER_BOTTOM_LEFT_X);
+CASE(NS_SIDE_BOTTOM, true,  false, NS_CORNER_BOTTOM_LEFT_Y);
+
+CASE(NS_SIDE_LEFT,   false, false, NS_CORNER_BOTTOM_LEFT_X);
+CASE(NS_SIDE_LEFT,   false, true,  NS_CORNER_BOTTOM_LEFT_Y);
+CASE(NS_SIDE_LEFT,   true,  false, NS_CORNER_TOP_LEFT_X);
+CASE(NS_SIDE_LEFT,   true,  true,  NS_CORNER_TOP_LEFT_Y);
+#undef CASE