1 files changed, 150 insertions, 0 deletions
diff --git a/dom/smil/nsSMILMappedAttribute.cpp b/dom/smil/nsSMILMappedAttribute.cpp
new file mode 100644
index 000000000..b43469fac
--- /dev/null
+++ b/dom/smil/nsSMILMappedAttribute.cpp
@@ -0,0 +1,150 @@
+/* -*- 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/. */
+
+/* representation of a SMIL-animatable mapped attribute on an element */
+#include "nsSMILMappedAttribute.h"
+#include "nsContentUtils.h"
+#include "nsError.h" // For NS_PROPTABLE_PROP_OVERWRITTEN
+#include "nsSMILValue.h"
+#include "nsSMILCSSValueType.h"
+#include "nsIDocument.h"
+#include "nsIPresShell.h"
+#include "nsCSSProps.h"
+#include "mozilla/dom/Element.h"
+
+// Callback function, for freeing string buffers stored in property table
+static void
+ReleaseStringBufferPropertyValue(void*    aObject,       /* unused */
+                                 nsIAtom* aPropertyName, /* unused */
+                                 void*    aPropertyValue,
+                                 void*    aData          /* unused */)
+{
+  nsStringBuffer* buf = static_cast<nsStringBuffer*>(aPropertyValue);
+  buf->Release();
+}
+
+
+nsresult
+nsSMILMappedAttribute::ValueFromString(const nsAString& aStr,
+                                       const mozilla::dom::SVGAnimationElement* aSrcElement,
+                                       nsSMILValue& aValue,
+                                       bool& aPreventCachingOfSandwich) const
+{
+  NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
+
+  nsSMILCSSValueType::ValueFromString(mPropID, mElement, aStr, aValue,
+                                      &aPreventCachingOfSandwich);
+  return aValue.IsNull() ? NS_ERROR_FAILURE : NS_OK;
+}
+
+nsSMILValue
+nsSMILMappedAttribute::GetBaseValue() const
+{
+  nsAutoString baseStringValue;
+  RefPtr<nsIAtom> attrName = GetAttrNameAtom();
+  bool success = mElement->GetAttr(kNameSpaceID_None, attrName,
+                                     baseStringValue);
+  nsSMILValue baseValue;
+  if (success) {
+    // For base values, we don't need to worry whether the value returned is
+    // context-sensitive or not since the compositor will take care of comparing
+    // the returned (computed) base value and its cached value and determining
+    // if an update is required or not.
+    nsSMILCSSValueType::ValueFromString(mPropID, mElement,
+                                        baseStringValue, baseValue, nullptr);
+  } else {
+    // Attribute is unset -- use computed value.
+    // FIRST: Temporarily clear animated value, to make sure it doesn't pollute
+    // the computed value. (We want base value, _without_ animations applied.)
+    void* buf = mElement->UnsetProperty(SMIL_MAPPED_ATTR_ANIMVAL,
+                                        attrName, nullptr);
+    FlushChangesToTargetAttr();
+
+    // SECOND: we use nsSMILCSSProperty::GetBaseValue to look up the property's
+    // computed value.  NOTE: This call will temporarily clear the SMIL
+    // override-style for the corresponding CSS property on our target element.
+    // This prevents any animations that target the CSS property from affecting
+    // animations that target the mapped attribute.
+    baseValue = nsSMILCSSProperty::GetBaseValue();
+
+    // FINALLY: If we originally had an animated value set, then set it again.
+    if (buf) {
+      mElement->SetProperty(SMIL_MAPPED_ATTR_ANIMVAL, attrName, buf,
+                            ReleaseStringBufferPropertyValue);
+      FlushChangesToTargetAttr();
+    }
+  }
+  return baseValue;
+}
+
+nsresult
+nsSMILMappedAttribute::SetAnimValue(const nsSMILValue& aValue)
+{
+  NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
+
+  // Convert nsSMILValue to string
+  nsAutoString valStr;
+  if (!nsSMILCSSValueType::ValueToString(aValue, valStr)) {
+    NS_WARNING("Failed to convert nsSMILValue for mapped attr into a string");
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<nsIAtom> attrName = GetAttrNameAtom();
+  nsStringBuffer* oldValStrBuf = static_cast<nsStringBuffer*>
+    (mElement->GetProperty(SMIL_MAPPED_ATTR_ANIMVAL, attrName));
+  if (oldValStrBuf) {
+    nsString oldValStr;
+    nsContentUtils::PopulateStringFromStringBuffer(oldValStrBuf, oldValStr);
+    if (valStr.Equals(oldValStr)) {
+      // New animated value is the same as the old; nothing to do.
+      return NS_OK;
+    }
+  }
+
+  // Set the string as this mapped attribute's animated value.
+  nsStringBuffer* valStrBuf =
+    nsCSSValue::BufferFromString(nsString(valStr)).take();
+  nsresult rv = mElement->SetProperty(SMIL_MAPPED_ATTR_ANIMVAL,
+                                      attrName, valStrBuf,
+                                      ReleaseStringBufferPropertyValue);
+  if (rv == NS_PROPTABLE_PROP_OVERWRITTEN) {
+    rv = NS_OK;
+  }
+  FlushChangesToTargetAttr();
+
+  return rv;
+}
+
+void
+nsSMILMappedAttribute::ClearAnimValue()
+{
+  RefPtr<nsIAtom> attrName = GetAttrNameAtom();
+  mElement->DeleteProperty(SMIL_MAPPED_ATTR_ANIMVAL, attrName);
+  FlushChangesToTargetAttr();
+}
+
+void
+nsSMILMappedAttribute::FlushChangesToTargetAttr() const
+{
+  // Clear animated content-style-rule
+  mElement->DeleteProperty(SMIL_MAPPED_ATTR_ANIMVAL,
+                           SMIL_MAPPED_ATTR_STYLERULE_ATOM);
+  nsIDocument* doc = mElement->GetUncomposedDoc();
+
+  // Request animation restyle
+  if (doc) {
+    nsIPresShell* shell = doc->GetShell();
+    if (shell) {
+      shell->RestyleForAnimation(mElement, eRestyle_Self);
+    }
+  }
+}
+
+already_AddRefed<nsIAtom>
+nsSMILMappedAttribute::GetAttrNameAtom() const
+{
+  return NS_Atomize(nsCSSProps::GetStringValue(mPropID));
+}