layout/style/CachedInheritingStyles.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/CachedInheritingStyles.h"
   8
   9 #include "mozilla/ComputedStyle.h"
  10 #include "nsCOMPtr.h"
  11 #include "nsWindowSizes.h"
  12
  13 namespace mozilla {
  14
  15 void CachedInheritingStyles::Insert(ComputedStyle* aStyle) {
  16   MOZ_ASSERT(aStyle);
  17   MOZ_ASSERT(aStyle->IsInheritingAnonBox() ||
  18              aStyle->IsLazilyCascadedPseudoElement());
  19
  20   if (IsEmpty()) {
  21     RefPtr<ComputedStyle> s = aStyle;
  22     mBits = reinterpret_cast<uintptr_t>(s.forget().take());
  23     MOZ_ASSERT(!IsEmpty() && !IsIndirect());
  24   } else if (IsIndirect()) {
  25     AsIndirect()->AppendElement(aStyle);
  26   } else {
  27     IndirectCache* cache = new IndirectCache();
  28     cache->AppendElement(dont_AddRef(AsDirect()));
  29     cache->AppendElement(aStyle);
  30     mBits = reinterpret_cast<uintptr_t>(cache) | 1;
  31     MOZ_ASSERT(IsIndirect());
  32   }
  33 }
  34
  35 ComputedStyle* CachedInheritingStyles::Lookup(PseudoStyleType aType) const {
  36   MOZ_ASSERT(PseudoStyle::IsPseudoElement(aType) ||
  37              PseudoStyle::IsInheritingAnonBox(aType));
  38   if (IsIndirect()) {
  39     for (auto& style : *AsIndirect()) {
  40       if (style->GetPseudoType() == aType) {
  41         return style;
  42       }
  43     }
  44
  45     return nullptr;
  46   }
  47
  48   ComputedStyle* direct = AsDirect();
  49   return direct && direct->GetPseudoType() == aType ? direct : nullptr;
  50 }
  51
  52 void CachedInheritingStyles::AddSizeOfIncludingThis(nsWindowSizes& aSizes,
  53                                                     size_t* aCVsSize) const {
  54   if (IsIndirect()) {
  55     for (auto& style : *AsIndirect()) {
  56       if (!aSizes.mState.HaveSeenPtr(style)) {
  57         style->AddSizeOfIncludingThis(aSizes, aCVsSize);
  58       }
  59     }
  60
  61     return;
  62   }
  63
  64   ComputedStyle* direct = AsDirect();
  65   if (direct && !aSizes.mState.HaveSeenPtr(direct)) {
  66     direct->AddSizeOfIncludingThis(aSizes, aCVsSize);
  67   }
  68 }
  69
  70 }  // namespace mozilla