layout/style/ServoElementSnapshot.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/ServoElementSnapshot.h"
   8 #include "mozilla/GeckoBindings.h"
   9 #include "mozilla/dom/Element.h"
  10 #include "nsIContentInlines.h"
  11 #include "nsContentUtils.h"
  12
  13 namespace mozilla {
  14
  15 ServoElementSnapshot::ServoElementSnapshot(const Element& aElement)
  16     : mState(0),
  17       mContains(Flags(0)),
  18       mIsTableBorderNonzero(false),
  19       mIsSelectListBox(false),
  20       mClassAttributeChanged(false),
  21       mIdAttributeChanged(false) {
  22   MOZ_COUNT_CTOR(ServoElementSnapshot);
  23   MOZ_ASSERT(NS_IsMainThread());
  24   mIsInChromeDocument = nsContentUtils::IsChromeDoc(aElement.OwnerDoc());
  25   mSupportsLangAttr = aElement.SupportsLangAttr();
  26 }
  27
  28 void ServoElementSnapshot::AddOtherPseudoClassState(const Element& aElement) {
  29   if (HasOtherPseudoClassState()) {
  30     return;
  31   }
  32
  33   mIsTableBorderNonzero = Gecko_IsTableBorderNonzero(&aElement);
  34   mIsSelectListBox = Gecko_IsSelectListBox(&aElement);
  35
  36   mContains |= Flags::OtherPseudoClassState;
  37 }
  38
  39 void ServoElementSnapshot::AddAttrs(const Element& aElement,
  40                                     int32_t aNameSpaceID, nsAtom* aAttribute) {
  41   if (aNameSpaceID == kNameSpaceID_None) {
  42     if (aAttribute == nsGkAtoms::_class) {
  43       if (mClassAttributeChanged) {
  44         return;
  45       }
  46       mClassAttributeChanged = true;
  47     } else if (aAttribute == nsGkAtoms::id) {
  48       if (mIdAttributeChanged) {
  49         return;
  50       }
  51       mIdAttributeChanged = true;
  52     }
  53   }
  54
  55   if (!mChangedAttrNames.Contains(aAttribute)) {
  56     mChangedAttrNames.AppendElement(aAttribute);
  57   }
  58
  59   if (HasAttrs()) {
  60     return;
  61   }
  62
  63   uint32_t attrCount = aElement.GetAttrCount();
  64   mAttrs.SetCapacity(attrCount);
  65   for (uint32_t i = 0; i < attrCount; ++i) {
  66     const BorrowedAttrInfo info = aElement.GetAttrInfoAt(i);
  67     MOZ_ASSERT(info);
  68     mAttrs.AppendElement(AttrArray::InternalAttr{*info.mName, *info.mValue});
  69   }
  70
  71   mContains |= Flags::Attributes;
  72   if (aElement.HasID()) {
  73     mContains |= Flags::Id;
  74   }
  75
  76   if (const nsAttrValue* classValue = aElement.GetClasses()) {
  77     // FIXME(emilio): It's pretty unfortunate that this is only relevant for
  78     // SVG, yet it's a somewhat expensive copy. We should be able to do
  79     // better!
  80     mClass = *classValue;
  81     mContains |= Flags::MaybeClass;
  82   }
  83 }
  84
  85 void ServoElementSnapshot::AddCustomStates(Element& aElement) {
  86   if (mContains & Flags::CustomState) {
  87     return;
  88   }
  89   mCustomStates = aElement.EnsureCustomStates().Clone();
  90   mContains |= Flags::CustomState;
  91 }
  92 }  // namespace mozilla