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       mIsMozBrowserFrame(false),
  20       mIsSelectListBox(false),
  21       mClassAttributeChanged(false),
  22       mIdAttributeChanged(false) {
  23   MOZ_COUNT_CTOR(ServoElementSnapshot);
  24   MOZ_ASSERT(NS_IsMainThread());
  25   mIsInChromeDocument = nsContentUtils::IsChromeDoc(aElement.OwnerDoc());
  26   mSupportsLangAttr = aElement.SupportsLangAttr();
  27 }
  28
  29 void ServoElementSnapshot::AddOtherPseudoClassState(const Element& aElement) {
  30   if (HasOtherPseudoClassState()) {
  31     return;
  32   }
  33
  34   mIsTableBorderNonzero = Gecko_IsTableBorderNonzero(&aElement);
  35   mIsMozBrowserFrame = Gecko_IsBrowserFrame(&aElement);
  36   mIsSelectListBox = Gecko_IsSelectListBox(&aElement);
  37
  38   mContains |= Flags::OtherPseudoClassState;
  39 }
  40
  41 void ServoElementSnapshot::AddAttrs(const Element& aElement,
  42                                     int32_t aNameSpaceID, nsAtom* aAttribute) {
  43   if (aNameSpaceID == kNameSpaceID_None) {
  44     if (aAttribute == nsGkAtoms::_class) {
  45       if (mClassAttributeChanged) {
  46         return;
  47       }
  48       mClassAttributeChanged = true;
  49     } else if (aAttribute == nsGkAtoms::id) {
  50       if (mIdAttributeChanged) {
  51         return;
  52       }
  53       mIdAttributeChanged = true;
  54     }
  55   }
  56
  57   if (!mChangedAttrNames.Contains(aAttribute)) {
  58     mChangedAttrNames.AppendElement(aAttribute);
  59   }
  60
  61   if (HasAttrs()) {
  62     return;
  63   }
  64
  65   uint32_t attrCount = aElement.GetAttrCount();
  66   mAttrs.SetCapacity(attrCount);
  67   for (uint32_t i = 0; i < attrCount; ++i) {
  68     const BorrowedAttrInfo info = aElement.GetAttrInfoAt(i);
  69     MOZ_ASSERT(info);
  70     mAttrs.AppendElement(AttrArray::InternalAttr{*info.mName, *info.mValue});
  71   }
  72
  73   mContains |= Flags::Attributes;
  74   if (aElement.HasID()) {
  75     mContains |= Flags::Id;
  76   }
  77
  78   if (const nsAttrValue* classValue = aElement.GetClasses()) {
  79     // FIXME(emilio): It's pretty unfortunate that this is only relevant for
  80     // SVG, yet it's a somewhat expensive copy. We should be able to do
  81     // better!
  82     mClass = *classValue;
  83     mContains |= Flags::MaybeClass;
  84   }
  85 }
  86
  87 }  // namespace mozilla