layout/generic/RubyUtils.cpp

   1 /* -*- Mode: C++; tab-width: 2; 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 "RubyUtils.h"
   8
   9 using namespace mozilla;
  10
  11 NS_DECLARE_FRAME_PROPERTY(ReservedISize, nullptr);
  12
  13 union NSCoordValue
  14 {
  15   nscoord mCoord;
  16   void* mPointer;
  17   static_assert(sizeof(nscoord) <= sizeof(void*),
  18                 "Cannot store nscoord in pointer");
  19 };
  20
  21 /* static */ void
  22 RubyUtils::SetReservedISize(nsIFrame* aFrame, nscoord aISize)
  23 {
  24   MOZ_ASSERT(IsExpandableRubyBox(aFrame));
  25   NSCoordValue value = { aISize };
  26   aFrame->Properties().Set(ReservedISize(), value.mPointer);
  27 }
  28
  29 /* static */ void
  30 RubyUtils::ClearReservedISize(nsIFrame* aFrame)
  31 {
  32   MOZ_ASSERT(IsExpandableRubyBox(aFrame));
  33   aFrame->Properties().Remove(ReservedISize());
  34 }
  35
  36 /* static */ nscoord
  37 RubyUtils::GetReservedISize(nsIFrame* aFrame)
  38 {
  39   MOZ_ASSERT(IsExpandableRubyBox(aFrame));
  40   NSCoordValue value;
  41   value.mPointer = aFrame->Properties().Get(ReservedISize());
  42   return value.mCoord;
  43 }
  44
  45 RubyTextContainerIterator::RubyTextContainerIterator(
  46   nsRubyBaseContainerFrame* aBaseContainer)
  47 {
  48   mFrame = aBaseContainer;
  49   Next();
  50 }
  51
  52 void
  53 RubyTextContainerIterator::Next()
  54 {
  55   MOZ_ASSERT(mFrame, "Should have checked AtEnd()");
  56   mFrame = mFrame->GetNextSibling();
  57   if (mFrame && mFrame->GetType() != nsGkAtoms::rubyTextContainerFrame) {
  58     mFrame = nullptr;
  59   }
  60 }