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-rw-r--r--dom/smil/nsSMILValue.cpp162
1 files changed, 162 insertions, 0 deletions
diff --git a/dom/smil/nsSMILValue.cpp b/dom/smil/nsSMILValue.cpp
new file mode 100644
index 000000000..cd881b0b0
--- /dev/null
+++ b/dom/smil/nsSMILValue.cpp
@@ -0,0 +1,162 @@
+/* -*- 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 "nsSMILValue.h"
+#include "nsDebug.h"
+#include <string.h>
+
+//----------------------------------------------------------------------
+// Public methods
+
+nsSMILValue::nsSMILValue(const nsISMILType* aType)
+ : mType(nsSMILNullType::Singleton())
+{
+ if (!aType) {
+ NS_ERROR("Trying to construct nsSMILValue with null mType pointer");
+ return;
+ }
+
+ InitAndCheckPostcondition(aType);
+}
+
+nsSMILValue::nsSMILValue(const nsSMILValue& aVal)
+ : mType(nsSMILNullType::Singleton())
+{
+ InitAndCheckPostcondition(aVal.mType);
+ mType->Assign(*this, aVal);
+}
+
+const nsSMILValue&
+nsSMILValue::operator=(const nsSMILValue& aVal)
+{
+ if (&aVal == this)
+ return *this;
+
+ if (mType != aVal.mType) {
+ DestroyAndReinit(aVal.mType);
+ }
+
+ mType->Assign(*this, aVal);
+
+ return *this;
+}
+
+// Move constructor / reassignment operator:
+nsSMILValue::nsSMILValue(nsSMILValue&& aVal)
+ : mU(aVal.mU), // Copying union is only OK because we clear aVal.mType below.
+ mType(aVal.mType)
+{
+ // Leave aVal with a null type, so that it's safely destructible (and won't
+ // mess with anything referenced by its union, which we've copied).
+ aVal.mType = nsSMILNullType::Singleton();
+}
+
+nsSMILValue&
+nsSMILValue::operator=(nsSMILValue&& aVal)
+{
+ if (!IsNull()) {
+ // Clean up any data we're currently tracking.
+ DestroyAndCheckPostcondition();
+ }
+
+ // Copy the union (which could include a pointer to external memory) & mType:
+ mU = aVal.mU;
+ mType = aVal.mType;
+
+ // Leave aVal with a null type, so that it's safely destructible (and won't
+ // mess with anything referenced by its union, which we've now copied).
+ aVal.mType = nsSMILNullType::Singleton();
+
+ return *this;
+}
+
+bool
+nsSMILValue::operator==(const nsSMILValue& aVal) const
+{
+ if (&aVal == this)
+ return true;
+
+ return mType == aVal.mType && mType->IsEqual(*this, aVal);
+}
+
+nsresult
+nsSMILValue::Add(const nsSMILValue& aValueToAdd, uint32_t aCount)
+{
+ if (aValueToAdd.mType != mType) {
+ NS_ERROR("Trying to add incompatible types");
+ return NS_ERROR_FAILURE;
+ }
+
+ return mType->Add(*this, aValueToAdd, aCount);
+}
+
+nsresult
+nsSMILValue::SandwichAdd(const nsSMILValue& aValueToAdd)
+{
+ if (aValueToAdd.mType != mType) {
+ NS_ERROR("Trying to add incompatible types");
+ return NS_ERROR_FAILURE;
+ }
+
+ return mType->SandwichAdd(*this, aValueToAdd);
+}
+
+nsresult
+nsSMILValue::ComputeDistance(const nsSMILValue& aTo, double& aDistance) const
+{
+ if (aTo.mType != mType) {
+ NS_ERROR("Trying to calculate distance between incompatible types");
+ return NS_ERROR_FAILURE;
+ }
+
+ return mType->ComputeDistance(*this, aTo, aDistance);
+}
+
+nsresult
+nsSMILValue::Interpolate(const nsSMILValue& aEndVal,
+ double aUnitDistance,
+ nsSMILValue& aResult) const
+{
+ if (aEndVal.mType != mType) {
+ NS_ERROR("Trying to interpolate between incompatible types");
+ return NS_ERROR_FAILURE;
+ }
+
+ if (aResult.mType != mType) {
+ // Outparam has wrong type
+ aResult.DestroyAndReinit(mType);
+ }
+
+ return mType->Interpolate(*this, aEndVal, aUnitDistance, aResult);
+}
+
+//----------------------------------------------------------------------
+// Helper methods
+
+// Wrappers for nsISMILType::Init & ::Destroy that verify their postconditions
+void
+nsSMILValue::InitAndCheckPostcondition(const nsISMILType* aNewType)
+{
+ aNewType->Init(*this);
+ MOZ_ASSERT(mType == aNewType,
+ "Post-condition of Init failed. nsSMILValue is invalid");
+}
+
+void
+nsSMILValue::DestroyAndCheckPostcondition()
+{
+ mType->Destroy(*this);
+ MOZ_ASSERT(IsNull(),
+ "Post-condition of Destroy failed. "
+ "nsSMILValue not null after destroying");
+}
+
+void
+nsSMILValue::DestroyAndReinit(const nsISMILType* aNewType)
+{
+ DestroyAndCheckPostcondition();
+ InitAndCheckPostcondition(aNewType);
+}