import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/smil/SMILIntegerType.cpp

@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "SMILIntegerType.h"
+#include "nsSMILValue.h"
+#include "nsDebug.h"
+#include <math.h>
+
+namespace mozilla {
+
+void
+SMILIntegerType::Init(nsSMILValue& aValue) const
+{
+  MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
+  aValue.mU.mInt = 0;
+  aValue.mType = this;
+}
+
+void
+SMILIntegerType::Destroy(nsSMILValue& aValue) const
+{
+  NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
+  aValue.mU.mInt = 0;
+  aValue.mType = nsSMILNullType::Singleton();
+}
+
+nsresult
+SMILIntegerType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
+{
+  NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
+  NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
+  aDest.mU.mInt = aSrc.mU.mInt;
+  return NS_OK;
+}
+
+bool
+SMILIntegerType::IsEqual(const nsSMILValue& aLeft,
+                         const nsSMILValue& aRight) const
+{
+  NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
+  NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
+
+  return aLeft.mU.mInt == aRight.mU.mInt;
+}
+
+nsresult
+SMILIntegerType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
+                     uint32_t aCount) const
+{
+  NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
+                  "Trying to add invalid types");
+  NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
+  aDest.mU.mInt += aValueToAdd.mU.mInt * aCount;
+  return NS_OK;
+}
+
+nsresult
+SMILIntegerType::ComputeDistance(const nsSMILValue& aFrom,
+                                 const nsSMILValue& aTo,
+                                 double& aDistance) const
+{
+  NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
+  NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
+  aDistance = fabs(double(aTo.mU.mInt - aFrom.mU.mInt));
+  return NS_OK;
+}
+
+nsresult
+SMILIntegerType::Interpolate(const nsSMILValue& aStartVal,
+                             const nsSMILValue& aEndVal,
+                             double aUnitDistance,
+                             nsSMILValue& aResult) const
+{
+  NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
+                  "Trying to interpolate different types");
+  NS_PRECONDITION(aStartVal.mType == this,
+                  "Unexpected types for interpolation");
+  NS_PRECONDITION(aResult.mType   == this, "Unexpected result type");
+
+  const double startVal   = double(aStartVal.mU.mInt);
+  const double endVal     = double(aEndVal.mU.mInt);
+  const double currentVal = startVal + (endVal - startVal) * aUnitDistance;
+
+  // When currentVal is exactly midway between its two nearest integers, we
+  // jump to the "next" integer to provide simple, easy to remember and
+  // consistent behaviour (from the SMIL author's point of view).
+
+  if (startVal < endVal) {
+    aResult.mU.mInt = int64_t(floor(currentVal + 0.5)); // round mid up
+  } else {
+    aResult.mU.mInt = int64_t(ceil(currentVal - 0.5)); // round mid down
+  }
+
+  return NS_OK;
+}
+
+} // namespace mozilla