1 files changed, 87 insertions, 0 deletions
diff --git a/layout/style/ServoElementSnapshot.cpp b/layout/style/ServoElementSnapshot.cpp
new file mode 100644
index 0000000000..8c661072df
--- /dev/null
+++ b/layout/style/ServoElementSnapshot.cpp
@@ -0,0 +1,87 @@
+/* -*- 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 "mozilla/ServoElementSnapshot.h"
+#include "mozilla/GeckoBindings.h"
+#include "mozilla/dom/Element.h"
+#include "nsIContentInlines.h"
+#include "nsContentUtils.h"
+
+namespace mozilla {
+
+ServoElementSnapshot::ServoElementSnapshot(const Element& aElement)
+    : mState(0),
+      mContains(Flags(0)),
+      mIsTableBorderNonzero(false),
+      mIsMozBrowserFrame(false),
+      mIsSelectListBox(false),
+      mClassAttributeChanged(false),
+      mIdAttributeChanged(false) {
+  MOZ_COUNT_CTOR(ServoElementSnapshot);
+  MOZ_ASSERT(NS_IsMainThread());
+  mIsInChromeDocument = nsContentUtils::IsChromeDoc(aElement.OwnerDoc());
+  mSupportsLangAttr = aElement.SupportsLangAttr();
+}
+
+void ServoElementSnapshot::AddOtherPseudoClassState(const Element& aElement) {
+  if (HasOtherPseudoClassState()) {
+    return;
+  }
+
+  mIsTableBorderNonzero = Gecko_IsTableBorderNonzero(&aElement);
+  mIsMozBrowserFrame = Gecko_IsBrowserFrame(&aElement);
+  mIsSelectListBox = Gecko_IsSelectListBox(&aElement);
+
+  mContains |= Flags::OtherPseudoClassState;
+}
+
+void ServoElementSnapshot::AddAttrs(const Element& aElement,
+                                    int32_t aNameSpaceID, nsAtom* aAttribute) {
+  if (aNameSpaceID == kNameSpaceID_None) {
+    if (aAttribute == nsGkAtoms::_class) {
+      if (mClassAttributeChanged) {
+        return;
+      }
+      mClassAttributeChanged = true;
+    } else if (aAttribute == nsGkAtoms::id) {
+      if (mIdAttributeChanged) {
+        return;
+      }
+      mIdAttributeChanged = true;
+    }
+  }
+
+  if (!mChangedAttrNames.Contains(aAttribute)) {
+    mChangedAttrNames.AppendElement(aAttribute);
+  }
+
+  if (HasAttrs()) {
+    return;
+  }
+
+  uint32_t attrCount = aElement.GetAttrCount();
+  mAttrs.SetCapacity(attrCount);
+  for (uint32_t i = 0; i < attrCount; ++i) {
+    const BorrowedAttrInfo info = aElement.GetAttrInfoAt(i);
+    MOZ_ASSERT(info);
+    mAttrs.AppendElement(AttrArray::InternalAttr{*info.mName, *info.mValue});
+  }
+
+  mContains |= Flags::Attributes;
+  if (aElement.HasID()) {
+    mContains |= Flags::Id;
+  }
+
+  if (const nsAttrValue* classValue = aElement.GetClasses()) {
+    // FIXME(emilio): It's pretty unfortunate that this is only relevant for
+    // SVG, yet it's a somewhat expensive copy. We should be able to do
+    // better!
+    mClass = *classValue;
+    mContains |= Flags::MaybeClass;
+  }
+}
+
+}  // namespace mozilla