DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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Mercurial (1aeaa33a64f9)

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/* -*- 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/. */

/*
 * structs that contain the data provided by nsStyleContext, the
 * internal API for computed style data for an element
 */

#include "nsStyleStruct.h"
#include "nsStyleStructInlines.h"
#include "nsStyleConsts.h"
#include "nsThemeConstants.h"
#include "nsString.h"
#include "nsPresContext.h"
#include "nsIAppShellService.h"
#include "nsIWidget.h"
#include "nsCRTGlue.h"
#include "nsCSSParser.h"
#include "nsCSSProps.h"
#include "nsDeviceContext.h"
#include "nsStyleUtil.h"

#include "nsCOMPtr.h"

#include "nsBidiUtils.h"
#include "nsLayoutUtils.h"

#include "imgIRequest.h"
#include "imgIContainer.h"
#include "CounterStyleManager.h"

#include "mozilla/dom/AnimationEffectReadOnlyBinding.h"  // for PlaybackDirection
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/ImageTracker.h"
#include "mozilla/CORSMode.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Likely.h"
#include "nsIURI.h"
#include "nsIDocument.h"
#include <algorithm>
#include "ImageLoader.h"

using namespace mozilla;
using namespace mozilla::dom;

static_assert((((1 << nsStyleStructID_Length) - 1) &
               ~(NS_STYLE_INHERIT_MASK)) == 0,
              "Not enough bits in NS_STYLE_INHERIT_MASK");

/* static */ const int32_t nsStyleGridLine::kMinLine;
/* static */ const int32_t nsStyleGridLine::kMaxLine;

// We set the size limit of style structs to 504 bytes so that when they
// are allocated by Servo side with Arc, the total size doesn't exceed
// 512 bytes, which minimizes allocator slop.
static constexpr size_t kStyleStructSizeLimit = 504;
#define STYLE_STRUCT(name_, checkdata_cb_)                       \
  static_assert(sizeof(nsStyle##name_) <= kStyleStructSizeLimit, \
                "nsStyle" #name_ " became larger than the size limit");
#include "nsStyleStructList.h"
#undef STYLE_STRUCT

static bool DefinitelyEqualURIs(css::URLValueData* aURI1,
                                css::URLValueData* aURI2) {
  return aURI1 == aURI2 ||
         (aURI1 && aURI2 && aURI1->DefinitelyEqualURIs(*aURI2));
}

static bool DefinitelyEqualURIsAndPrincipal(css::URLValueData* aURI1,
                                            css::URLValueData* aURI2) {
  return aURI1 == aURI2 ||
         (aURI1 && aURI2 && aURI1->DefinitelyEqualURIsAndPrincipal(*aURI2));
}

static bool DefinitelyEqualImages(nsStyleImageRequest* aRequest1,
                                  nsStyleImageRequest* aRequest2) {
  if (aRequest1 == aRequest2) {
    return true;
  }

  if (!aRequest1 || !aRequest2) {
    return false;
  }

  return aRequest1->DefinitelyEquals(*aRequest2);
}

// A nullsafe wrapper for strcmp. We depend on null-safety.
static int safe_strcmp(const char16_t* a, const char16_t* b) {
  if (!a || !b) {
    return (int)(a - b);
  }
  return NS_strcmp(a, b);
}

static bool AreShadowArraysEqual(nsCSSShadowArray* lhs, nsCSSShadowArray* rhs);

// --------------------
// nsStyleFont
//
nsStyleFont::nsStyleFont(const nsFont& aFont, const nsPresContext* aContext)
    : mFont(aFont),
      mSize(nsStyleFont::ZoomText(aContext, mFont.size)),
      mFontSizeFactor(1.0),
      mFontSizeOffset(0),
      mFontSizeKeyword(NS_STYLE_FONT_SIZE_MEDIUM),
      mGenericID(kGenericFont_NONE),
      mScriptLevel(0),
      mMathVariant(NS_MATHML_MATHVARIANT_NONE),
      mMathDisplay(NS_MATHML_DISPLAYSTYLE_INLINE),
      mMinFontSizeRatio(100)  // 100%
      ,
      mExplicitLanguage(false),
      mAllowZoom(true),
      mScriptUnconstrainedSize(mSize),
      mScriptMinSize(nsPresContext::CSSTwipsToAppUnits(
          NS_POINTS_TO_TWIPS(NS_MATHML_DEFAULT_SCRIPT_MIN_SIZE_PT))),
      mScriptSizeMultiplier(NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER),
      mLanguage(GetLanguage(aContext)) {
  MOZ_COUNT_CTOR(nsStyleFont);
  mFont.size = mSize;
}

nsStyleFont::nsStyleFont(const nsStyleFont& aSrc)
    : mFont(aSrc.mFont),
      mSize(aSrc.mSize),
      mFontSizeFactor(aSrc.mFontSizeFactor),
      mFontSizeOffset(aSrc.mFontSizeOffset),
      mFontSizeKeyword(aSrc.mFontSizeKeyword),
      mGenericID(aSrc.mGenericID),
      mScriptLevel(aSrc.mScriptLevel),
      mMathVariant(aSrc.mMathVariant),
      mMathDisplay(aSrc.mMathDisplay),
      mMinFontSizeRatio(aSrc.mMinFontSizeRatio),
      mExplicitLanguage(aSrc.mExplicitLanguage),
      mAllowZoom(aSrc.mAllowZoom),
      mScriptUnconstrainedSize(aSrc.mScriptUnconstrainedSize),
      mScriptMinSize(aSrc.mScriptMinSize),
      mScriptSizeMultiplier(aSrc.mScriptSizeMultiplier),
      mLanguage(aSrc.mLanguage) {
  MOZ_COUNT_CTOR(nsStyleFont);
}

nsStyleFont::nsStyleFont(const nsPresContext* aContext)
    : nsStyleFont(*aContext->GetDefaultFont(kPresContext_DefaultVariableFont_ID,
                                            nullptr),
                  aContext) {
  MOZ_ASSERT(NS_IsMainThread());
  nscoord minimumFontSize = aContext->MinFontSize(mLanguage);
  if (minimumFontSize > 0 && !aContext->IsChrome()) {
    mFont.size = std::max(mSize, minimumFontSize);
  } else {
    mFont.size = mSize;
  }
}

void nsStyleFont::Destroy(nsPresContext* aContext) {
  this->~nsStyleFont();
  aContext->PresShell()->FreeByObjectID(eArenaObjectID_nsStyleFont, this);
}

void nsStyleFont::EnableZoom(nsPresContext* aContext, bool aEnable) {
  if (mAllowZoom == aEnable) {
    return;
  }
  mAllowZoom = aEnable;
  if (mAllowZoom) {
    mSize = nsStyleFont::ZoomText(aContext, mSize);
    mFont.size = nsStyleFont::ZoomText(aContext, mFont.size);
    mScriptUnconstrainedSize =
        nsStyleFont::ZoomText(aContext, mScriptUnconstrainedSize);
  } else {
    mSize = nsStyleFont::UnZoomText(aContext, mSize);
    mFont.size = nsStyleFont::UnZoomText(aContext, mFont.size);
    mScriptUnconstrainedSize =
        nsStyleFont::UnZoomText(aContext, mScriptUnconstrainedSize);
  }
}

nsChangeHint nsStyleFont::CalcDifference(const nsStyleFont& aNewData) const {
  MOZ_ASSERT(mAllowZoom == aNewData.mAllowZoom,
             "expected mAllowZoom to be the same on both nsStyleFonts");
  if (mSize != aNewData.mSize || mLanguage != aNewData.mLanguage ||
      mExplicitLanguage != aNewData.mExplicitLanguage ||
      mMathVariant != aNewData.mMathVariant ||
      mMathDisplay != aNewData.mMathDisplay ||
      mMinFontSizeRatio != aNewData.mMinFontSizeRatio) {
    return NS_STYLE_HINT_REFLOW;
  }

  switch (mFont.CalcDifference(aNewData.mFont)) {
    case nsFont::MaxDifference::eLayoutAffecting:
      return NS_STYLE_HINT_REFLOW;

    case nsFont::MaxDifference::eVisual:
      return NS_STYLE_HINT_VISUAL;

    case nsFont::MaxDifference::eNone:
      break;
  }

  // XXX Should any of these cause a non-nsChangeHint_NeutralChange change?
  if (mGenericID != aNewData.mGenericID ||
      mScriptLevel != aNewData.mScriptLevel ||
      mScriptUnconstrainedSize != aNewData.mScriptUnconstrainedSize ||
      mScriptMinSize != aNewData.mScriptMinSize ||
      mScriptSizeMultiplier != aNewData.mScriptSizeMultiplier) {
    return nsChangeHint_NeutralChange;
  }

  return nsChangeHint(0);
}

/* static */ nscoord nsStyleFont::ZoomText(const nsPresContext* aPresContext,
                                           nscoord aSize) {
  // aSize can be negative (e.g.: calc(-1px)) so we can't assert that here.
  // The caller is expected deal with that.
  return NSToCoordTruncClamped(float(aSize) *
                               aPresContext->EffectiveTextZoom());
}

/* static */ nscoord nsStyleFont::UnZoomText(nsPresContext* aPresContext,
                                             nscoord aSize) {
  // aSize can be negative (e.g.: calc(-1px)) so we can't assert that here.
  // The caller is expected deal with that.
  return NSToCoordTruncClamped(float(aSize) /
                               aPresContext->EffectiveTextZoom());
}

/* static */ already_AddRefed<nsAtom> nsStyleFont::GetLanguage(
    const nsPresContext* aPresContext) {
  RefPtr<nsAtom> language = aPresContext->GetContentLanguage();
  if (!language) {
    // we didn't find a (usable) Content-Language, so we fall back
    // to whatever the presContext guessed from the charset
    // NOTE this should not be used elsewhere, because we want websites
    // to use UTF-8 with proper language tag, instead of relying on
    // deriving language from charset. See bug 1040668 comment 67.
    language = aPresContext->GetLanguageFromCharset();
  }
  return language.forget();
}

nsStyleMargin::nsStyleMargin(const nsPresContext* aContext) {
  MOZ_COUNT_CTOR(nsStyleMargin);
  nsStyleCoord zero(0, nsStyleCoord::CoordConstructor);
  NS_FOR_CSS_SIDES(side) { mMargin.Set(side, zero); }
}

nsStyleMargin::nsStyleMargin(const nsStyleMargin& aSrc)
    : mMargin(aSrc.mMargin) {
  MOZ_COUNT_CTOR(nsStyleMargin);
}

void nsStyleMargin::Destroy(nsPresContext* aContext) {
  this->~nsStyleMargin();
  aContext->PresShell()->FreeByObjectID(eArenaObjectID_nsStyleMargin, this);
}

nsChangeHint nsStyleMargin::CalcDifference(
    const nsStyleMargin& aNewData) const {
  if (mMargin == aNewData.mMargin) {
    return nsChangeHint(0);
  }
  // Margin differences can't affect descendant intrinsic sizes and
  // don't need to force children to reflow.
  return nsChangeHint_NeedReflow | nsChangeHint_ReflowChangesSizeOrPosition |
         nsChangeHint_ClearAncestorIntrinsics;
}

nsStylePadding::nsStylePadding(const nsPresContext* aContext) {
  MOZ_COUNT_CTOR(nsStylePadding);
  nsStyleCoord zero(0, nsStyleCoord::CoordConstructor);
  NS_FOR_CSS_SIDES(side) { mPadding.Set(side, zero); }
}

nsStylePadding::nsStylePadding(const nsStylePadding& aSrc)
    : mPadding(aSrc.mPadding) {
  MOZ_COUNT_CTOR(nsStylePadding);
}

void nsStylePadding::Destroy(nsPresContext* aContext) {
  this->~nsStylePadding();
  aContext->PresShell()->FreeByObjectID(eArenaObjectID_nsStylePadding, this);
}

nsChangeHint nsStylePadding::CalcDifference(
    const nsStylePadding& aNewData) const {
  if (mPadding == aNewData.mPadding) {
    return nsChangeHint(0);
  }
  // Padding differences can't affect descendant intrinsic sizes, but do need
  // to force children to reflow so that we can reposition them, since their
  // offsets are from our frame bounds but our content rect's position within
  // those bounds is moving.
  // FIXME: It would be good to return a weaker hint here that doesn't
  // force reflow of all descendants, but the hint would need to force
  // reflow of the frame's children (see how
  // ReflowInput::InitResizeFlags initializes the inline-resize flag).
  return NS_STYLE_HINT_REFLOW & ~nsChangeHint_ClearDescendantIntrinsics;
}

nsStyleBorder::nsStyleBorder(const nsPresContext* aContext)
    : mBorderImageFill(NS_STYLE_BORDER_IMAGE_SLICE_NOFILL),
      mBorderImageRepeatH(StyleBorderImageRepeat::Stretch),
      mBorderImageRepeatV(StyleBorderImageRepeat::Stretch),
      mFloatEdge(StyleFloatEdge::ContentBox),
      mBoxDecorationBreak(StyleBoxDecorationBreak::Slice),
      mComputedBorder(0, 0, 0, 0) {
  MOZ_COUNT_CTOR(nsStyleBorder);

  NS_FOR_CSS_HALF_CORNERS(corner) {
    mBorderRadius.Set(corner, nsStyleCoord(0, nsStyleCoord::CoordConstructor));
  }

  nscoord medium = (StaticPresData::Get()
                        ->GetBorderWidthTable())[NS_STYLE_BORDER_WIDTH_MEDIUM];
  NS_FOR_CSS_SIDES(side) {
    mBorderImageSlice.Set(side, nsStyleCoord(1.0f, eStyleUnit_Percent));
    mBorderImageWidth.Set(side, nsStyleCoord(1.0f, eStyleUnit_Factor));
    mBorderImageOutset.Set(side, nsStyleCoord(0.0f, eStyleUnit_Factor));

    mBorder.Side(side) = medium;
    mBorderStyle[side] = NS_STYLE_BORDER_STYLE_NONE;
    mBorderColor[side] = StyleComplexColor::CurrentColor();
  }

  mTwipsPerPixel = aContext->DevPixelsToAppUnits(1);
}

nsStyleBorder::nsStyleBorder(const nsStyleBorder& aSrc)
    : mBorderRadius(aSrc.mBorderRadius),
      mBorderImageSource(aSrc.mBorderImageSource),
      mBorderImageSlice(aSrc.mBorderImageSlice),
      mBorderImageWidth(aSrc.mBorderImageWidth),
      mBorderImageOutset(aSrc.mBorderImageOutset),
      mBorderImageFill(aSrc.mBorderImageFill),
      mBorderImageRepeatH(aSrc.mBorderImageRepeatH),
      mBorderImageRepeatV(aSrc.mBorderImageRepeatV),
      mFloatEdge(aSrc.mFloatEdge),
      mBoxDecorationBreak(aSrc.mBoxDecorationBreak),
      mComputedBorder(aSrc.mComputedBorder),
      mBorder(aSrc.mBorder),
      mTwipsPerPixel(aSrc.mTwipsPerPixel) {
  MOZ_COUNT_CTOR(nsStyleBorder);
  NS_FOR_CSS_SIDES(side) {
    mBorderStyle[side] = aSrc.mBorderStyle[side];
    mBorderColor[side] = aSrc.mBorderColor[side];
  }
}

nsStyleBorder::~nsStyleBorder() { MOZ_COUNT_DTOR(nsStyleBorder); }

void nsStyleBorder::FinishStyle(nsPresContext* aPresContext,
                                const nsStyleBorder* aOldStyle) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aPresContext->StyleSet()->IsServo());

  mBorderImageSource.ResolveImage(
      aPresContext, aOldStyle ? &aOldStyle->mBorderImageSource : nullptr);
}

nsMargin nsStyleBorder::GetImageOutset() const {
  // We don't check whether there is a border-image (which is OK since
  // the initial values yields 0 outset) so that we don't have to
  // reflow to update overflow areas when an image loads.
  nsMargin outset;
  NS_FOR_CSS_SIDES(s) {
    nsStyleCoord coord = mBorderImageOutset.Get(s);
    nscoord value;
    switch (coord.GetUnit()) {
      case eStyleUnit_Coord:
        value = coord.GetCoordValue();
        break;
      case eStyleUnit_Factor:
        value = coord.GetFactorValue() * mComputedBorder.Side(s);
        break;
      default:
        NS_NOTREACHED("unexpected CSS unit for image outset");
        value = 0;
        break;
    }
    outset.Side(s) = value;
  }
  return outset;
}

void nsStyleBorder::Destroy(nsPresContext* aContext) {
  this->~nsStyleBorder();
  aContext->PresShell()->FreeByObjectID(eArenaObjectID_nsStyleBorder, this);
}

nsChangeHint nsStyleBorder::CalcDifference(
    const nsStyleBorder& aNewData) const {
  // FIXME: XXXbz: As in nsStylePadding::CalcDifference, many of these
  // differences should not need to clear descendant intrinsics.
  // FIXME: It would be good to return a weaker hint for the
  // GetComputedBorder() differences (and perhaps others) that doesn't
  // force reflow of all descendants, but the hint would need to force
  // reflow of the frame's children (see how
  // ReflowInput::InitResizeFlags initializes the inline-resize flag).
  if (mTwipsPerPixel != aNewData.mTwipsPerPixel ||
      GetComputedBorder() != aNewData.GetComputedBorder() ||
      mFloatEdge != aNewData.mFloatEdge ||
      mBorderImageOutset != aNewData.mBorderImageOutset ||
      mBoxDecorationBreak != aNewData.mBoxDecorationBreak) {
    return NS_STYLE_HINT_REFLOW;
  }

  NS_FOR_CSS_SIDES(ix) {
    // See the explanation in nsChangeHint.h of
    // nsChangeHint_BorderStyleNoneChange .
    // Furthermore, even though we know *this* side is 0 width, just
    // assume a repaint hint for some other change rather than bother
    // tracking this result through the rest of the function.
    if (HasVisibleStyle(ix) != aNewData.HasVisibleStyle(ix)) {
      return nsChangeHint_RepaintFrame | nsChangeHint_BorderStyleNoneChange;
    }
  }

  // Note that mBorderStyle stores not only the border style but also
  // color-related flags.  Given that we've already done an mComputedBorder
  // comparison, border-style differences can only lead to a repaint hint.  So
  // it's OK to just compare the values directly -- if either the actual
  // style or the color flags differ we want to repaint.
  NS_FOR_CSS_SIDES(ix) {
    if (mBorderStyle[ix] != aNewData.mBorderStyle[ix] ||
        mBorderColor[ix] != aNewData.mBorderColor[ix]) {
      return nsChangeHint_RepaintFrame;
    }
  }

  if (mBorderRadius != aNewData.mBorderRadius) {
    return nsChangeHint_RepaintFrame;
  }

  // Loading status of the border image can be accessed in main thread only
  // while CalcDifference might be executed on a background thread. As a
  // result, we have to check mBorderImage* fields even before border image was
  // actually loaded.
  if (!mBorderImageSource.IsEmpty() || !aNewData.mBorderImageSource.IsEmpty()) {
    if (mBorderImageSource != aNewData.mBorderImageSource ||
        mBorderImageRepeatH != aNewData.mBorderImageRepeatH ||
        mBorderImageRepeatV != aNewData.mBorderImageRepeatV ||
        mBorderImageSlice != aNewData.mBorderImageSlice ||
        mBorderImageFill != aNewData.mBorderImageFill ||
        mBorderImageWidth != aNewData.mBorderImageWidth) {
      return nsChangeHint_RepaintFrame;
    }
  }

  // mBorder is the specified border value.  Changes to this don't
  // need any change processing, since we operate on the computed
  // border values instead.
  if (mBorder != aNewData.mBorder) {
    return nsChangeHint_NeutralChange;
  }

  // mBorderImage* fields are checked only when border-image is not 'none'.
  if (mBorderImageSource != aNewData.mBorderImageSource ||
      mBorderImageRepeatH != aNewData.mBorderImageRepeatH ||
      mBorderImageRepeatV != aNewData.mBorderImageRepeatV ||
      mBorderImageSlice != aNewData.mBorderImageSlice ||
      mBorderImageFill != aNewData.mBorderImageFill ||
      mBorderImageWidth != aNewData.mBorderImageWidth) {
    return nsChangeHint_NeutralChange;
  }

  return nsChangeHint(0);
}

nsStyleOutline::nsStyleOutline(const nsPresContext* aContext)
    : mOutlineWidth(
          (StaticPresData::Get()
               ->GetBorderWidthTable())[NS_STYLE_BORDER_WIDTH_MEDIUM]),
      mOutlineOffset(0),
      mOutlineColor(StyleComplexColor::CurrentColor()),
      mOutlineStyle(NS_STYLE_BORDER_STYLE_NONE),
      mActualOutlineWidth(0),
      mTwipsPerPixel(aContext->DevPixelsToAppUnits(1)) {
  MOZ_COUNT_CTOR(nsStyleOutline);
  // spacing values not inherited
  nsStyleCoord zero(0, nsStyleCoord::CoordConstructor);
  NS_FOR_CSS_HALF_CORNERS(corner) { mOutlineRadius.Set(corner, zero); }
}

nsStyleOutline::nsStyleOutline(const nsStyleOutline& aSrc)
    : mOutlineRadius(aSrc.mOutlineRadius),
      mOutlineWidth(aSrc.mOutlineWidth),
      mOutlineOffset(aSrc.mOutlineOffset),
      mOutlineColor(aSrc.mOutlineColor),
      mOutlineStyle(aSrc.mOutlineStyle),
      mActualOutlineWidth(aSrc.mActualOutlineWidth),
      mTwipsPerPixel(aSrc.mTwipsPerPixel) {
  MOZ_COUNT_CTOR(nsStyleOutline);
}

void nsStyleOutline::RecalcData() {
  if (NS_STYLE_BORDER_STYLE_NONE == mOutlineStyle) {
    mActualOutlineWidth = 0;
  } else {
    mActualOutlineWidth =
        NS_ROUND_BORDER_TO_PIXELS(mOutlineWidth, mTwipsPerPixel);
  }
}

nsChangeHint nsStyleOutline::CalcDifference(
    const nsStyleOutline& aNewData) const {
  if (mActualOutlineWidth != aNewData.mActualOutlineWidth ||
      (mActualOutlineWidth > 0 && mOutlineOffset != aNewData.mOutlineOffset)) {
    return nsChangeHint_UpdateOverflow | nsChangeHint_SchedulePaint |
           nsChangeHint_RepaintFrame;
  }

  if (mOutlineStyle != aNewData.mOutlineStyle ||
      mOutlineColor != aNewData.mOutlineColor ||
      mOutlineRadius != aNewData.mOutlineRadius) {
    if (mActualOutlineWidth > 0) {
      return nsChangeHint_RepaintFrame;
    }
    return nsChangeHint_NeutralChange;
  }

  if (mOutlineWidth != aNewData.mOutlineWidth ||
      mOutlineOffset != aNewData.mOutlineOffset ||
      mTwipsPerPixel != aNewData.mTwipsPerPixel) {
    return nsChangeHint_NeutralChange;
  }

  return nsChangeHint(0);
}

// --------------------
// nsStyleList
//
nsStyleList::nsStyleList(const nsPresContext* aContext)
    : mListStylePosition(NS_STYLE_LIST_STYLE_POSITION_OUTSIDE) {
  MOZ_COUNT_CTOR(nsStyleList);
  mCounterStyle = CounterStyleManager::GetDiscStyle();
  SetQuotesInitial();
}

nsStyleList::~nsStyleList() { MOZ_COUNT_DTOR(nsStyleList); }

nsStyleList::nsStyleList(const nsStyleList& aSource)
    : mListStylePosition(aSource.mListStylePosition),
      mListStyleImage(aSource.mListStyleImage),
      mCounterStyle(aSource.mCounterStyle),
      mQuotes(aSource.mQuotes),
      mImageRegion(aSource.mImageRegion) {
  MOZ_COUNT_CTOR(nsStyleList);
}

void nsStyleList::FinishStyle(nsPresContext* aPresContext,
                              const nsStyleList* aOldStyle) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aPresContext->StyleSet()->IsServo());

  if (mListStyleImage && !mListStyleImage->IsResolved()) {
    mListStyleImage->Resolve(
        aPresContext, aOldStyle ? aOldStyle->mListStyleImage.get() : nullptr);
  }
  mCounterStyle.Resolve(aPresContext->CounterStyleManager());
}

void nsStyleList::SetQuotesInherit(const nsStyleList* aOther) {
  mQuotes = aOther->mQuotes;
}

void nsStyleList::SetQuotesInitial() {
  if (!sInitialQuotes) {
    // The initial value for quotes is the en-US typographic convention:
    // outermost are LEFT and RIGHT DOUBLE QUOTATION MARK, alternating
    // with LEFT and RIGHT SINGLE QUOTATION MARK.
    static const char16_t initialQuotes[8] = {0x201C, 0, 0x201D, 0,
                                              0x2018, 0, 0x2019, 0};

    sInitialQuotes = new nsStyleQuoteValues;
    sInitialQuotes->mQuotePairs.AppendElement(
        std::make_pair(nsDependentString(&initialQuotes[0], 1),
                       nsDependentString(&initialQuotes[2], 1)));
    sInitialQuotes->mQuotePairs.AppendElement(
        std::make_pair(nsDependentString(&initialQuotes[4], 1),
                       nsDependentString(&initialQuotes[6], 1)));
  }

  mQuotes = sInitialQuotes;
}

void nsStyleList::SetQuotesNone() {
  if (!sNoneQuotes) {
    sNoneQuotes = new nsStyleQuoteValues;
  }
  mQuotes = sNoneQuotes;
}

void nsStyleList::SetQuotes(nsStyleQuoteValues::QuotePairArray&& aValues) {
  mQuotes = new nsStyleQuoteValues;
  mQuotes->mQuotePairs = Move(aValues);
}

const nsStyleQuoteValues::QuotePairArray& nsStyleList::GetQuotePairs() const {
  return mQuotes->mQuotePairs;
}

nsChangeHint nsStyleList::CalcDifference(
    const nsStyleList& aNewData, const nsStyleDisplay* aOldDisplay) const {
  // If the quotes implementation is ever going to change we might not need
  // a framechange here and a reflow should be sufficient.  See bug 35768.
  if (mQuotes != aNewData.mQuotes && (mQuotes || aNewData.mQuotes) &&
      GetQuotePairs() != aNewData.GetQuotePairs()) {
    return nsChangeHint_ReconstructFrame;
  }
  nsChangeHint hint = nsChangeHint(0);
  // Only elements whose display value is list-item can be affected by
  // list-style-position and list-style-type. If the old display struct
  // doesn't exist, assume it isn't affected by display value at all,
  // and thus these properties should not affect it either. This also
  // relies on that when the display value changes from something else
  // to list-item, that change itself would cause ReconstructFrame.
  if (aOldDisplay && aOldDisplay->mDisplay == StyleDisplay::ListItem) {
    if (mListStylePosition != aNewData.mListStylePosition) {
      return nsChangeHint_ReconstructFrame;
    }
    if (mCounterStyle != aNewData.mCounterStyle) {
      return NS_STYLE_HINT_REFLOW;
    }
  } else if (mListStylePosition != aNewData.mListStylePosition ||
             mCounterStyle != aNewData.mCounterStyle) {
    hint = nsChangeHint_NeutralChange;
  }
  // list-style-image and -moz-image-region may affect some XUL elements
  // regardless of display value, so we still need to check them.
  if (!DefinitelyEqualImages(mListStyleImage, aNewData.mListStyleImage)) {
    return NS_STYLE_HINT_REFLOW;
  }
  if (!mImageRegion.IsEqualInterior(aNewData.mImageRegion)) {
    if (mImageRegion.width != aNewData.mImageRegion.width ||
        mImageRegion.height != aNewData.mImageRegion.height) {
      return NS_STYLE_HINT_REFLOW;
    }
    return NS_STYLE_HINT_VISUAL;
  }
  return hint;
}

already_AddRefed<nsIURI> nsStyleList::GetListStyleImageURI() const {
  if (!mListStyleImage) {
    return nullptr;
  }

  nsCOMPtr<nsIURI> uri = mListStyleImage->GetImageURI();
  return uri.forget();
}

StaticRefPtr<nsStyleQuoteValues> nsStyleList::sInitialQuotes;

StaticRefPtr<nsStyleQuoteValues> nsStyleList::sNoneQuotes;

// --------------------
// nsStyleXUL
//
nsStyleXUL::nsStyleXUL(const nsPresContext* aContext)
    : mBoxFlex(0.0f),
      mBoxOrdinal(1),
      mBoxAlign(StyleBoxAlign::Stretch),
      mBoxDirection(StyleBoxDirection::Normal),
      mBoxOrient(StyleBoxOrient::Horizontal),
      mBoxPack(StyleBoxPack::Start),
      mStackSizing(StyleStackSizing::StretchToFit) {
  MOZ_COUNT_CTOR(nsStyleXUL);
}

nsStyleXUL::~nsStyleXUL() { MOZ_COUNT_DTOR(nsStyleXUL); }

nsStyleXUL::nsStyleXUL(const nsStyleXUL& aSource)
    : mBoxFlex(aSource.mBoxFlex),
      mBoxOrdinal(aSource.mBoxOrdinal),
      mBoxAlign(aSource.mBoxAlign),
      mBoxDirection(aSource.mBoxDirection),
      mBoxOrient(aSource.mBoxOrient),
      mBoxPack(aSource.mBoxPack),
      mStackSizing(aSource.mStackSizing) {
  MOZ_COUNT_CTOR(nsStyleXUL);
}

nsChangeHint nsStyleXUL::CalcDifference(const nsStyleXUL& aNewData) const {
  if (mBoxAlign == aNewData.mBoxAlign &&
      mBoxDirection == aNewData.mBoxDirection &&
      mBoxFlex == aNewData.mBoxFlex && mBoxOrient == aNewData.mBoxOrient &&
      mBoxPack == aNewData.mBoxPack && mBoxOrdinal == aNewData.mBoxOrdinal &&
      mStackSizing == aNewData.mStackSizing) {
    return nsChangeHint(0);
  }
  if (mBoxOrdinal != aNewData.mBoxOrdinal) {
    return nsChangeHint_ReconstructFrame;
  }
  return NS_STYLE_HINT_REFLOW;
}

// --------------------
// nsStyleColumn
//
/* static */ const uint32_t nsStyleColumn::kMaxColumnCount;

nsStyleColumn::nsStyleColumn(const nsPresContext* aContext)
    : mColumnCount(NS_STYLE_COLUMN_COUNT_AUTO),
      mColumnWidth(eStyleUnit_Auto),
      mColumnGap(eStyleUnit_Normal),
      mColumnRuleColor(StyleComplexColor::CurrentColor()),
      mColumnRuleStyle(NS_STYLE_BORDER_STYLE_NONE),
      mColumnFill(NS_STYLE_COLUMN_FILL_BALANCE),
      mColumnSpan(NS_STYLE_COLUMN_SPAN_NONE),
      mColumnRuleWidth(
          (StaticPresData::Get()
               ->GetBorderWidthTable())[NS_STYLE_BORDER_WIDTH_MEDIUM]),
      mTwipsPerPixel(aContext->AppUnitsPerDevPixel()) {
  MOZ_COUNT_CTOR(nsStyleColumn);
}

nsStyleColumn::~nsStyleColumn() { MOZ_COUNT_DTOR(nsStyleColumn); }

nsStyleColumn::nsStyleColumn(const nsStyleColumn& aSource)
    : mColumnCount(aSource.mColumnCount),
      mColumnWidth(aSource.mColumnWidth),
      mColumnGap(aSource.mColumnGap),
      mColumnRuleColor(aSource.mColumnRuleColor),
      mColumnRuleStyle(aSource.mColumnRuleStyle),
      mColumnFill(aSource.mColumnFill),
      mColumnSpan(aSource.mColumnSpan),
      mColumnRuleWidth(aSource.mColumnRuleWidth),
      mTwipsPerPixel(aSource.mTwipsPerPixel) {
  MOZ_COUNT_CTOR(nsStyleColumn);
}

nsChangeHint nsStyleColumn::CalcDifference(
    const nsStyleColumn& aNewData) const {
  if ((mColumnWidth.GetUnit() == eStyleUnit_Auto) !=
          (aNewData.mColumnWidth.GetUnit() == eStyleUnit_Auto) ||
      mColumnCount != aNewData.mColumnCount ||
      mColumnSpan != aNewData.mColumnSpan) {
    // We force column count changes to do a reframe, because it's tricky to
    // handle some edge cases where the column count gets smaller and content
    // overflows.
    // XXX not ideal
    return nsChangeHint_ReconstructFrame;
  }

  if (mColumnWidth != aNewData.mColumnWidth ||
      mColumnGap != aNewData.mColumnGap ||
      mColumnFill != aNewData.mColumnFill) {
    return NS_STYLE_HINT_REFLOW;
  }

  if (GetComputedColumnRuleWidth() != aNewData.GetComputedColumnRuleWidth() ||
      mColumnRuleStyle != aNewData.mColumnRuleStyle ||
      mColumnRuleColor != aNewData.mColumnRuleColor) {
    return NS_STYLE_HINT_VISUAL;
  }

  // XXX Is it right that we never check mTwipsPerPixel to return a
  // non-nsChangeHint_NeutralChange hint?
  if (mColumnRuleWidth != aNewData.mColumnRuleWidth ||
      mTwipsPerPixel != aNewData.mTwipsPerPixel) {
    return nsChangeHint_NeutralChange;
  }

  return nsChangeHint(0);
}

// --------------------
// nsStyleSVG
//
nsStyleSVG::nsStyleSVG(const nsPresContext* aContext)
    : mFill(eStyleSVGPaintType_Color)  // Will be initialized to NS_RGB(0, 0, 0)
      ,
      mStroke(eStyleSVGPaintType_None),
      mStrokeDashoffset(0, nsStyleCoord::CoordConstructor),
      mStrokeWidth(nsPresContext::CSSPixelsToAppUnits(1),
                   nsStyleCoord::CoordConstructor),
      mFillOpacity(1.0f),
      mStrokeMiterlimit(4.0f),
      mStrokeOpacity(1.0f),
      mClipRule(StyleFillRule::Nonzero),
      mColorInterpolation(NS_STYLE_COLOR_INTERPOLATION_SRGB),
      mColorInterpolationFilters(NS_STYLE_COLOR_INTERPOLATION_LINEARRGB),
      mFillRule(StyleFillRule::Nonzero),
      mPaintOrder(NS_STYLE_PAINT_ORDER_NORMAL),
      mShapeRendering(NS_STYLE_SHAPE_RENDERING_AUTO),
      mStrokeLinecap(NS_STYLE_STROKE_LINECAP_BUTT),
      mStrokeLinejoin(NS_STYLE_STROKE_LINEJOIN_MITER),
      mTextAnchor(NS_STYLE_TEXT_ANCHOR_START),
      mContextPropsBits(0),
      mContextFlags(
          (eStyleSVGOpacitySource_Normal << FILL_OPACITY_SOURCE_SHIFT) |
          (eStyleSVGOpacitySource_Normal << STROKE_OPACITY_SOURCE_SHIFT)) {
  MOZ_COUNT_CTOR(nsStyleSVG);
}

nsStyleSVG::~nsStyleSVG() { MOZ_COUNT_DTOR(nsStyleSVG); }

nsStyleSVG::nsStyleSVG(const nsStyleSVG& aSource)
    : mFill(aSource.mFill),
      mStroke(aSource.mStroke),
      mMarkerEnd(aSource.mMarkerEnd),
      mMarkerMid(aSource.mMarkerMid),
      mMarkerStart(aSource.mMarkerStart),
      mStrokeDasharray(aSource.mStrokeDasharray),
      mContextProps(aSource.mContextProps),
      mStrokeDashoffset(aSource.mStrokeDashoffset),
      mStrokeWidth(aSource.mStrokeWidth),
      mFillOpacity(aSource.mFillOpacity),
      mStrokeMiterlimit(aSource.mStrokeMiterlimit),
      mStrokeOpacity(aSource.mStrokeOpacity),
      mClipRule(aSource.mClipRule),
      mColorInterpolation(aSource.mColorInterpolation),
      mColorInterpolationFilters(aSource.mColorInterpolationFilters),
      mFillRule(aSource.mFillRule),
      mPaintOrder(aSource.mPaintOrder),
      mShapeRendering(aSource.mShapeRendering),
      mStrokeLinecap(aSource.mStrokeLinecap),
      mStrokeLinejoin(aSource.mStrokeLinejoin),
      mTextAnchor(aSource.mTextAnchor),
      mContextPropsBits(aSource.mContextPropsBits),
      mContextFlags(aSource.mContextFlags) {
  MOZ_COUNT_CTOR(nsStyleSVG);
}

static bool PaintURIChanged(const nsStyleSVGPaint& aPaint1,
                            const nsStyleSVGPaint& aPaint2) {
  if (aPaint1.Type() != aPaint2.Type()) {
    return aPaint1.Type() == eStyleSVGPaintType_Server ||
           aPaint2.Type() == eStyleSVGPaintType_Server;
  }
  return aPaint1.Type() == eStyleSVGPaintType_Server &&
         !DefinitelyEqualURIs(aPaint1.GetPaintServer(),
                              aPaint2.GetPaintServer());
}

nsChangeHint nsStyleSVG::CalcDifference(const nsStyleSVG& aNewData) const {
  nsChangeHint hint = nsChangeHint(0);

  if (!DefinitelyEqualURIs(mMarkerEnd, aNewData.mMarkerEnd) ||
      !DefinitelyEqualURIs(mMarkerMid, aNewData.mMarkerMid) ||
      !DefinitelyEqualURIs(mMarkerStart, aNewData.mMarkerStart)) {
    // Markers currently contribute to SVGGeometryFrame::mRect,
    // so we need a reflow as well as a repaint. No intrinsic sizes need
    // to change, so nsChangeHint_NeedReflow is sufficient.
    return nsChangeHint_UpdateEffects | nsChangeHint_NeedReflow |
           nsChangeHint_NeedDirtyReflow |  // XXX remove me: bug 876085
           nsChangeHint_RepaintFrame;
  }

  if (mFill != aNewData.mFill || mStroke != aNewData.mStroke ||
      mFillOpacity != aNewData.mFillOpacity ||
      mStrokeOpacity != aNewData.mStrokeOpacity) {
    hint |= nsChangeHint_RepaintFrame;
    if (HasStroke() != aNewData.HasStroke() ||
        (!HasStroke() && HasFill() != aNewData.HasFill())) {
      // Frame bounds and overflow rects depend on whether we "have" fill or
      // stroke. Whether we have stroke or not just changed, or else we have no
      // stroke (in which case whether we have fill or not is significant to
      // frame bounds) and whether we have fill or not just changed. In either
      // case we need to reflow so the frame rect is updated.
      // XXXperf this is a waste on non SVGGeometryFrames.
      hint |= nsChangeHint_NeedReflow |
              nsChangeHint_NeedDirtyReflow;  // XXX remove me: bug 876085
    }
    if (PaintURIChanged(mFill, aNewData.mFill) ||
        PaintURIChanged(mStroke, aNewData.mStroke)) {
      hint |= nsChangeHint_UpdateEffects;
    }
  }

  // Stroke currently contributes to SVGGeometryFrame::mRect, so
  // we need a reflow here. No intrinsic sizes need to change, so
  // nsChangeHint_NeedReflow is sufficient.
  // Note that stroke-dashoffset does not affect SVGGeometryFrame::mRect.
  // text-anchor changes also require a reflow since it changes frames' rects.
  if (mStrokeWidth != aNewData.mStrokeWidth ||
      mStrokeMiterlimit != aNewData.mStrokeMiterlimit ||
      mStrokeLinecap != aNewData.mStrokeLinecap ||
      mStrokeLinejoin != aNewData.mStrokeLinejoin ||
      mTextAnchor != aNewData.mTextAnchor) {
    return hint | nsChangeHint_NeedReflow |
           nsChangeHint_NeedDirtyReflow |  // XXX remove me: bug 876085
           nsChangeHint_RepaintFrame;
  }

  if (hint & nsChangeHint_RepaintFrame) {
    return hint;  // we don't add anything else below
  }

  if (mStrokeDashoffset != aNewData.mStrokeDashoffset ||
      mClipRule != aNewData.mClipRule ||
      mColorInterpolation != aNewData.mColorInterpolation ||
      mColorInterpolationFilters != aNewData.mColorInterpolationFilters ||
      mFillRule != aNewData.mFillRule || mPaintOrder != aNewData.mPaintOrder ||
      mShapeRendering != aNewData.mShapeRendering ||
      mStrokeDasharray != aNewData.mStrokeDasharray ||
      mContextFlags != aNewData.mContextFlags ||
      mContextPropsBits != aNewData.mContextPropsBits) {
    return hint | nsChangeHint_RepaintFrame;
  }

  if (!hint) {
    if (mContextProps != aNewData.mContextProps) {
      hint = nsChangeHint_NeutralChange;
    }
  }

  return hint;
}

// --------------------
// StyleBasicShape

nsCSSKeyword StyleBasicShape::GetShapeTypeName() const {
  switch (mType) {
    case StyleBasicShapeType::Polygon:
      return eCSSKeyword_polygon;
    case StyleBasicShapeType::Circle:
      return eCSSKeyword_circle;
    case StyleBasicShapeType::Ellipse:
      return eCSSKeyword_ellipse;
    case StyleBasicShapeType::Inset:
      return eCSSKeyword_inset;
  }
  NS_NOTREACHED("unexpected type");
  return eCSSKeyword_UNKNOWN;
}

// --------------------
// StyleShapeSource

StyleShapeSource::StyleShapeSource(const StyleShapeSource& aSource) {
  DoCopy(aSource);
}

StyleShapeSource& StyleShapeSource::operator=(const StyleShapeSource& aOther) {
  if (this != &aOther) {
    DoCopy(aOther);
  }

  return *this;
}

bool StyleShapeSource::operator==(const StyleShapeSource& aOther) const {
  if (mType != aOther.mType) {
    return false;
  }

  switch (mType) {
    case StyleShapeSourceType::None:
      return true;

    case StyleShapeSourceType::URL:
    case StyleShapeSourceType::Image:
      return *mShapeImage == *aOther.mShapeImage;

    case StyleShapeSourceType::Shape:
      return *mBasicShape == *aOther.mBasicShape &&
             mReferenceBox == aOther.mReferenceBox;

    case StyleShapeSourceType::Box:
      return mReferenceBox == aOther.mReferenceBox;
  }

  MOZ_ASSERT_UNREACHABLE("Unexpected shape source type!");
  return true;
}

void StyleShapeSource::SetURL(css::URLValue* aValue) {
  MOZ_ASSERT(aValue);
  if (!mShapeImage) {
    mShapeImage = MakeUnique<nsStyleImage>();
  }
  mShapeImage->SetURLValue(do_AddRef(aValue));
  mType = StyleShapeSourceType::URL;
}

void StyleShapeSource::SetShapeImage(UniquePtr<nsStyleImage> aShapeImage) {
  MOZ_ASSERT(aShapeImage);
  mShapeImage = Move(aShapeImage);
  mType = StyleShapeSourceType::Image;
}

void StyleShapeSource::SetBasicShape(UniquePtr<StyleBasicShape> aBasicShape,
                                     StyleGeometryBox aReferenceBox) {
  MOZ_ASSERT(aBasicShape);
  mBasicShape = Move(aBasicShape);
  mReferenceBox = aReferenceBox;
  mType = StyleShapeSourceType::Shape;
}

void StyleShapeSource::SetReferenceBox(StyleGeometryBox aReferenceBox) {
  mReferenceBox = aReferenceBox;
  mType = StyleShapeSourceType::Box;
}

void StyleShapeSource::DoCopy(const StyleShapeSource& aOther) {
  switch (aOther.mType) {
    case StyleShapeSourceType::None:
      mReferenceBox = StyleGeometryBox::NoBox;
      mType = StyleShapeSourceType::None;
      break;

    case StyleShapeSourceType::URL:
      SetURL(aOther.GetURL());
      break;

    case StyleShapeSourceType::Image:
      SetShapeImage(MakeUnique<nsStyleImage>(*aOther.GetShapeImage()));
      break;

    case StyleShapeSourceType::Shape:
      SetBasicShape(MakeUnique<StyleBasicShape>(*aOther.GetBasicShape()),
                    aOther.GetReferenceBox());
      break;

    case StyleShapeSourceType::Box:
      SetReferenceBox(aOther.GetReferenceBox());
      break;
  }
}

// --------------------
// nsStyleFilter
//
nsStyleFilter::nsStyleFilter()
    : mType(NS_STYLE_FILTER_NONE), mDropShadow(nullptr) {
  MOZ_COUNT_CTOR(nsStyleFilter);
}

nsStyleFilter::nsStyleFilter(const nsStyleFilter& aSource)
    : mType(NS_STYLE_FILTER_NONE), mDropShadow(nullptr) {
  MOZ_COUNT_CTOR(nsStyleFilter);
  if (aSource.mType == NS_STYLE_FILTER_URL) {
    SetURL(aSource.mURL);
  } else if (aSource.mType == NS_STYLE_FILTER_DROP_SHADOW) {
    SetDropShadow(aSource.mDropShadow);
  } else if (aSource.mType != NS_STYLE_FILTER_NONE) {
    SetFilterParameter(aSource.mFilterParameter, aSource.mType);
  }
}

nsStyleFilter::~nsStyleFilter() {
  ReleaseRef();
  MOZ_COUNT_DTOR(nsStyleFilter);
}

nsStyleFilter& nsStyleFilter::operator=(const nsStyleFilter& aOther) {
  if (this == &aOther) {
    return *this;
  }

  if (aOther.mType == NS_STYLE_FILTER_URL) {
    SetURL(aOther.mURL);
  } else if (aOther.mType == NS_STYLE_FILTER_DROP_SHADOW) {
    SetDropShadow(aOther.mDropShadow);
  } else if (aOther.mType != NS_STYLE_FILTER_NONE) {
    SetFilterParameter(aOther.mFilterParameter, aOther.mType);
  } else {
    ReleaseRef();
    mType = NS_STYLE_FILTER_NONE;
  }

  return *this;
}

bool nsStyleFilter::operator==(const nsStyleFilter& aOther) const {
  if (mType != aOther.mType) {
    return false;
  }

  if (mType == NS_STYLE_FILTER_URL) {
    return DefinitelyEqualURIs(mURL, aOther.mURL);
  } else if (mType == NS_STYLE_FILTER_DROP_SHADOW) {
    return *mDropShadow == *aOther.mDropShadow;
  } else if (mType != NS_STYLE_FILTER_NONE) {
    return mFilterParameter == aOther.mFilterParameter;
  }

  return true;
}

void nsStyleFilter::ReleaseRef() {
  if (mType == NS_STYLE_FILTER_DROP_SHADOW) {
    NS_ASSERTION(mDropShadow, "expected pointer");
    mDropShadow->Release();
  } else if (mType == NS_STYLE_FILTER_URL) {
    NS_ASSERTION(mURL, "expected pointer");
    mURL->Release();
  }
  mURL = nullptr;
}

void nsStyleFilter::SetFilterParameter(const nsStyleCoord& aFilterParameter,
                                       int32_t aType) {
  ReleaseRef();
  mFilterParameter = aFilterParameter;
  mType = aType;
}

bool nsStyleFilter::SetURL(css::URLValue* aURL) {
  ReleaseRef();
  mURL = aURL;
  mURL->AddRef();
  mType = NS_STYLE_FILTER_URL;
  return true;
}

void nsStyleFilter::SetDropShadow(nsCSSShadowArray* aDropShadow) {
  NS_ASSERTION(aDropShadow, "expected pointer");
  ReleaseRef();
  mDropShadow = aDropShadow;
  mDropShadow->AddRef();
  mType = NS_STYLE_FILTER_DROP_SHADOW;
}

// --------------------
// nsStyleSVGReset
//
nsStyleSVGReset::nsStyleSVGReset(const nsPresContext* aContext)
    : mMask(nsStyleImageLayers::LayerType::Mask),
      mStopColor(NS_RGB(0, 0, 0)),
      mFloodColor(NS_RGB(0, 0, 0)),
      mLightingColor(NS_RGB(255, 255, 255)),
      mStopOpacity(1.0f),
      mFloodOpacity(1.0f),
      mDominantBaseline(NS_STYLE_DOMINANT_BASELINE_AUTO),
      mVectorEffect(NS_STYLE_VECTOR_EFFECT_NONE),
      mMaskType(NS_STYLE_MASK_TYPE_LUMINANCE) {
  MOZ_COUNT_CTOR(nsStyleSVGReset);
}

nsStyleSVGReset::~nsStyleSVGReset() { MOZ_COUNT_DTOR(nsStyleSVGReset); }

nsStyleSVGReset::nsStyleSVGReset(const nsStyleSVGReset& aSource)
    : mMask(aSource.mMask),
      mClipPath(aSource.mClipPath),
      mStopColor(aSource.mStopColor),
      mFloodColor(aSource.mFloodColor),
      mLightingColor(aSource.mLightingColor),
      mStopOpacity(aSource.mStopOpacity),
      mFloodOpacity(aSource.mFloodOpacity),
      mDominantBaseline(aSource.mDominantBaseline),
      mVectorEffect(aSource.mVectorEffect),
      mMaskType(aSource.mMaskType) {
  MOZ_COUNT_CTOR(nsStyleSVGReset);
}

void nsStyleSVGReset::Destroy(nsPresContext* aContext) {
  this->~nsStyleSVGReset();
  aContext->PresShell()->FreeByObjectID(mozilla::eArenaObjectID_nsStyleSVGReset,
                                        this);
}

void nsStyleSVGReset::FinishStyle(nsPresContext* aPresContext,
                                  const nsStyleSVGReset* aOldStyle) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aPresContext->StyleSet()->IsServo());

  NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, mMask) {
    nsStyleImage& image = mMask.mLayers[i].mImage;
    if (image.GetType() == eStyleImageType_Image) {
      // If the url of mask resource contains a reference('#'), it should be a
      // <mask-source>, mostly. For a <mask-source>, there is no need to
      // resolve this style image, since we do not depend on it to get the
      // SVG mask resource.
      if (!image.GetURLValue()->HasRef()) {
        const nsStyleImage* oldImage =
            (aOldStyle && aOldStyle->mMask.mLayers.Length() > i)
                ? &aOldStyle->mMask.mLayers[i].mImage
                : nullptr;

        image.ResolveImage(aPresContext, oldImage);
      }
    }
  }
}

nsChangeHint nsStyleSVGReset::CalcDifference(
    const nsStyleSVGReset& aNewData) const {
  nsChangeHint hint = nsChangeHint(0);

  if (mClipPath != aNewData.mClipPath) {
    hint |= nsChangeHint_UpdateEffects | nsChangeHint_RepaintFrame;
    // clip-path changes require that we update the PreEffectsBBoxProperty,
    // which is done during overflow computation.
    hint |= nsChangeHint_UpdateOverflow;
  }

  if (mDominantBaseline != aNewData.mDominantBaseline) {
    // XXXjwatt: why NS_STYLE_HINT_REFLOW? Isn't that excessive?
    hint |= NS_STYLE_HINT_REFLOW;
  } else if (mVectorEffect != aNewData.mVectorEffect) {
    // Stroke currently affects SVGGeometryFrame::mRect, and
    // vector-effect affect stroke. As a result we need to reflow if
    // vector-effect changes in order to have SVGGeometryFrame::
    // ReflowSVG called to update its mRect. No intrinsic sizes need
    // to change so nsChangeHint_NeedReflow is sufficient.
    hint |= nsChangeHint_NeedReflow |
            nsChangeHint_NeedDirtyReflow |  // XXX remove me: bug 876085
            nsChangeHint_RepaintFrame;
  } else if (mStopColor != aNewData.mStopColor ||
             mFloodColor != aNewData.mFloodColor ||
             mLightingColor != aNewData.mLightingColor ||
             mStopOpacity != aNewData.mStopOpacity ||
             mFloodOpacity != aNewData.mFloodOpacity ||
             mMaskType != aNewData.mMaskType) {
    hint |= nsChangeHint_RepaintFrame;
  }

  if (HasMask() != aNewData.HasMask()) {
    // A change from/to being a containing block for position:fixed.
    hint |= nsChangeHint_UpdateContainingBlock;
  }

  hint |=
      mMask.CalcDifference(aNewData.mMask, nsStyleImageLayers::LayerType::Mask);

  return hint;
}

bool nsStyleSVGReset::HasMask() const {
  for (uint32_t i = 0; i < mMask.mImageCount; i++) {
    if (!mMask.mLayers[i].mImage.IsEmpty()) {
      return true;
    }
  }

  return false;
}

// nsStyleSVGPaint implementation
nsStyleSVGPaint::nsStyleSVGPaint(nsStyleSVGPaintType aType)
    : mType(aType),
      mFallbackType(eStyleSVGFallbackType_NotSet),
      mFallbackColor(NS_RGB(0, 0, 0)) {
  MOZ_ASSERT(aType == nsStyleSVGPaintType(0) ||
             aType == eStyleSVGPaintType_None ||
             aType == eStyleSVGPaintType_Color);
  mPaint.mColor = NS_RGB(0, 0, 0);
}

nsStyleSVGPaint::nsStyleSVGPaint(const nsStyleSVGPaint& aSource)
    : nsStyleSVGPaint(nsStyleSVGPaintType(0)) {
  Assign(aSource);
}

nsStyleSVGPaint::~nsStyleSVGPaint() { Reset(); }

void nsStyleSVGPaint::Reset() {
  switch (mType) {
    case eStyleSVGPaintType_None:
      break;
    case eStyleSVGPaintType_Color:
      mPaint.mColor = NS_RGB(0, 0, 0);
      break;
    case eStyleSVGPaintType_Server:
      mPaint.mPaintServer->Release();
      mPaint.mPaintServer = nullptr;
      MOZ_FALLTHROUGH;
    case eStyleSVGPaintType_ContextFill:
    case eStyleSVGPaintType_ContextStroke:
      mFallbackType = eStyleSVGFallbackType_NotSet;
      mFallbackColor = NS_RGB(0, 0, 0);
      break;
  }
  mType = nsStyleSVGPaintType(0);
}

nsStyleSVGPaint& nsStyleSVGPaint::operator=(const nsStyleSVGPaint& aOther) {
  if (this != &aOther) {
    Assign(aOther);
  }
  return *this;
}

void nsStyleSVGPaint::Assign(const nsStyleSVGPaint& aOther) {
  MOZ_ASSERT(aOther.mType != nsStyleSVGPaintType(0),
             "shouldn't copy uninitialized nsStyleSVGPaint");

  switch (aOther.mType) {
    case eStyleSVGPaintType_None:
      SetNone();
      break;
    case eStyleSVGPaintType_Color:
      SetColor(aOther.mPaint.mColor);
      break;
    case eStyleSVGPaintType_Server:
      SetPaintServer(aOther.mPaint.mPaintServer, aOther.mFallbackType,
                     aOther.mFallbackColor);
      break;
    case eStyleSVGPaintType_ContextFill:
    case eStyleSVGPaintType_ContextStroke:
      SetContextValue(aOther.mType, aOther.mFallbackType,
                      aOther.mFallbackColor);
      break;
  }
}

void nsStyleSVGPaint::SetNone() {
  Reset();
  mType = eStyleSVGPaintType_None;
}

void nsStyleSVGPaint::SetContextValue(nsStyleSVGPaintType aType,
                                      nsStyleSVGFallbackType aFallbackType,
                                      nscolor aFallbackColor) {
  MOZ_ASSERT(aType == eStyleSVGPaintType_ContextFill ||
             aType == eStyleSVGPaintType_ContextStroke);
  Reset();
  mType = aType;
  mFallbackType = aFallbackType;
  mFallbackColor = aFallbackColor;
}

void nsStyleSVGPaint::SetColor(nscolor aColor) {
  Reset();
  mType = eStyleSVGPaintType_Color;
  mPaint.mColor = aColor;
}

void nsStyleSVGPaint::SetPaintServer(css::URLValue* aPaintServer,
                                     nsStyleSVGFallbackType aFallbackType,
                                     nscolor aFallbackColor) {
  MOZ_ASSERT(aPaintServer);
  Reset();
  mType = eStyleSVGPaintType_Server;
  mPaint.mPaintServer = aPaintServer;
  mPaint.mPaintServer->AddRef();
  mFallbackType = aFallbackType;
  mFallbackColor = aFallbackColor;
}

bool nsStyleSVGPaint::operator==(const nsStyleSVGPaint& aOther) const {
  if (mType != aOther.mType) {
    return false;
  }
  switch (mType) {
    case eStyleSVGPaintType_Color:
      return mPaint.mColor == aOther.mPaint.mColor;
    case eStyleSVGPaintType_Server:
      return DefinitelyEqualURIs(mPaint.mPaintServer,
                                 aOther.mPaint.mPaintServer) &&
             mFallbackType == aOther.mFallbackType &&
             mFallbackColor == aOther.mFallbackColor;
    case eStyleSVGPaintType_ContextFill:
    case eStyleSVGPaintType_ContextStroke:
      return mFallbackType == aOther.mFallbackType &&
             mFallbackColor == aOther.mFallbackColor;
    default:
      MOZ_ASSERT(mType == eStyleSVGPaintType_None, "Unexpected SVG paint type");
      return true;
  }
}

// --------------------
// nsStylePosition
//
nsStylePosition::nsStylePosition(const nsPresContext* aContext)
    : mWidth(eStyleUnit_Auto),
      mMinWidth(eStyleUnit_Auto),
      mMaxWidth(eStyleUnit_None),
      mHeight(eStyleUnit_Auto),
      mMinHeight(eStyleUnit_Auto),
      mMaxHeight(eStyleUnit_None),
      mFlexBasis(eStyleUnit_Auto),
      mGridAutoColumnsMin(eStyleUnit_Auto),
      mGridAutoColumnsMax(eStyleUnit_Auto),
      mGridAutoRowsMin(eStyleUnit_Auto),
      mGridAutoRowsMax(eStyleUnit_Auto),
      mGridAutoFlow(NS_STYLE_GRID_AUTO_FLOW_ROW),
      mBoxSizing(StyleBoxSizing::Content),
      mAlignContent(NS_STYLE_ALIGN_NORMAL),
      mAlignItems(NS_STYLE_ALIGN_NORMAL),
      mAlignSelf(NS_STYLE_ALIGN_AUTO),
      mJustifyContent(NS_STYLE_JUSTIFY_NORMAL),
      mSpecifiedJustifyItems(NS_STYLE_JUSTIFY_AUTO),
      mJustifyItems(NS_STYLE_JUSTIFY_NORMAL),
      mJustifySelf(NS_STYLE_JUSTIFY_AUTO),
      mFlexDirection(NS_STYLE_FLEX_DIRECTION_ROW),
      mFlexWrap(NS_STYLE_FLEX_WRAP_NOWRAP),
      mObjectFit(NS_STYLE_OBJECT_FIT_FILL),
      mOrder(NS_STYLE_ORDER_INITIAL),
      mFlexGrow(0.0f),
      mFlexShrink(1.0f),
      mZIndex(eStyleUnit_Auto),
      mGridColumnGap(nscoord(0), nsStyleCoord::CoordConstructor),
      mGridRowGap(nscoord(0), nsStyleCoord::CoordConstructor) {
  MOZ_COUNT_CTOR(nsStylePosition);

  // positioning values not inherited

  mObjectPosition.SetInitialPercentValues(0.5f);

  nsStyleCoord autoCoord(eStyleUnit_Auto);
  NS_FOR_CSS_SIDES(side) { mOffset.Set(side, autoCoord); }

  // The initial value of grid-auto-columns and grid-auto-rows is 'auto',
  // which computes to 'minmax(auto, auto)'.

  // Other members get their default constructors
  // which initialize them to representations of their respective initial value.
  // mGridTemplateAreas: nullptr for 'none'
  // mGridTemplate{Rows,Columns}: false and empty arrays for 'none'
  // mGrid{Column,Row}{Start,End}: false/0/empty values for 'auto'
}

nsStylePosition::~nsStylePosition() { MOZ_COUNT_DTOR(nsStylePosition); }

nsStylePosition::nsStylePosition(const nsStylePosition& aSource)
    : mObjectPosition(aSource.mObjectPosition),
      mOffset(aSource.mOffset),
      mWidth(aSource.mWidth),
      mMinWidth(aSource.mMinWidth),
      mMaxWidth(aSource.mMaxWidth),
      mHeight(aSource.mHeight),
      mMinHeight(aSource.mMinHeight),
      mMaxHeight(aSource.mMaxHeight),
      mFlexBasis(aSource.mFlexBasis),
      mGridAutoColumnsMin(aSource.mGridAutoColumnsMin),
      mGridAutoColumnsMax(aSource.mGridAutoColumnsMax),
      mGridAutoRowsMin(aSource.mGridAutoRowsMin),
      mGridAutoRowsMax(aSource.mGridAutoRowsMax),
      mGridAutoFlow(aSource.mGridAutoFlow),
      mBoxSizing(aSource.mBoxSizing),
      mAlignContent(aSource.mAlignContent),
      mAlignItems(aSource.mAlignItems),
      mAlignSelf(aSource.mAlignSelf),
      mJustifyContent(aSource.mJustifyContent),
      mSpecifiedJustifyItems(aSource.mSpecifiedJustifyItems),
      mJustifyItems(aSource.mJustifyItems),
      mJustifySelf(aSource.mJustifySelf),
      mFlexDirection(aSource.mFlexDirection),
      mFlexWrap(aSource.mFlexWrap),
      mObjectFit(aSource.mObjectFit),
      mOrder(aSource.mOrder),
      mFlexGrow(aSource.mFlexGrow),
      mFlexShrink(aSource.mFlexShrink),
      mZIndex(aSource.mZIndex),
      mGridTemplateAreas(aSource.mGridTemplateAreas),
      mGridColumnStart(aSource.mGridColumnStart),
      mGridColumnEnd(aSource.mGridColumnEnd),
      mGridRowStart(aSource.mGridRowStart),
      mGridRowEnd(aSource.mGridRowEnd),
      mGridColumnGap(aSource.mGridColumnGap),
      mGridRowGap(aSource.mGridRowGap) {
  MOZ_COUNT_CTOR(nsStylePosition);

  if (aSource.mGridTemplateColumns) {
    mGridTemplateColumns =
        MakeUnique<nsStyleGridTemplate>(*aSource.mGridTemplateColumns);
  }
  if (aSource.mGridTemplateRows) {
    mGridTemplateRows =
        MakeUnique<nsStyleGridTemplate>(*aSource.mGridTemplateRows);
  }
}

static bool IsAutonessEqual(const nsStyleSides& aSides1,
                            const nsStyleSides& aSides2) {
  NS_FOR_CSS_SIDES(side) {
    if ((aSides1.GetUnit(side) == eStyleUnit_Auto) !=
        (aSides2.GetUnit(side) == eStyleUnit_Auto)) {
      return false;
    }
  }
  return true;
}

static bool IsGridTemplateEqual(
    const UniquePtr<nsStyleGridTemplate>& aOldData,
    const UniquePtr<nsStyleGridTemplate>& aNewData) {
  if (aOldData == aNewData) {
    return true;
  }
  if (!aOldData || !aNewData) {
    return false;
  }
  return *aOldData == *aNewData;
}

nsChangeHint nsStylePosition::CalcDifference(
    const nsStylePosition& aNewData,
    const nsStyleVisibility* aOldStyleVisibility) const {
  nsChangeHint hint = nsChangeHint(0);

  // Changes to "z-index" require a repaint.
  if (mZIndex != aNewData.mZIndex) {
    hint |= nsChangeHint_RepaintFrame;
  }

  // Changes to "object-fit" & "object-position" require a repaint.  They
  // may also require a reflow, if we have a nsSubDocumentFrame, so that we
  // can adjust the size & position of the subdocument.
  if (mObjectFit != aNewData.mObjectFit ||
      mObjectPosition != aNewData.mObjectPosition) {
    hint |= nsChangeHint_RepaintFrame | nsChangeHint_NeedReflow;
  }

  if (mOrder != aNewData.mOrder) {
    // "order" impacts both layout order and stacking order, so we need both a
    // reflow and a repaint when it changes.  (Technically, we only need a
    // reflow if we're in a multi-line flexbox (which we can't be sure about,
    // since that's determined by styling on our parent) -- there, "order" can
    // affect which flex line we end up on, & hence can affect our sizing by
    // changing the group of flex items we're competing with for space.)
    return hint | nsChangeHint_RepaintFrame | nsChangeHint_AllReflowHints;
  }

  if (mBoxSizing != aNewData.mBoxSizing) {
    // Can affect both widths and heights; just a bad scene.
    return hint | nsChangeHint_AllReflowHints;
  }

  // Properties that apply to flex items:
  // XXXdholbert These should probably be more targeted (bug 819536)
  if (mAlignSelf != aNewData.mAlignSelf || mFlexBasis != aNewData.mFlexBasis ||
      mFlexGrow != aNewData.mFlexGrow || mFlexShrink != aNewData.mFlexShrink) {
    return hint | nsChangeHint_AllReflowHints;
  }

  // Properties that apply to flex containers:
  // - flex-direction can swap a flex container between vertical & horizontal.
  // - align-items can change the sizing of a flex container & the positioning
  //   of its children.
  // - flex-wrap changes whether a flex container's children are wrapped, which
  //   impacts their sizing/positioning and hence impacts the container's size.
  if (mAlignItems != aNewData.mAlignItems ||
      mFlexDirection != aNewData.mFlexDirection ||
      mFlexWrap != aNewData.mFlexWrap) {
    return hint | nsChangeHint_AllReflowHints;
  }

  // Properties that apply to grid containers:
  // FIXME: only for grid containers
  // (ie. 'display: grid' or 'display: inline-grid')
  if (!IsGridTemplateEqual(mGridTemplateColumns,
                           aNewData.mGridTemplateColumns) ||
      !IsGridTemplateEqual(mGridTemplateRows, aNewData.mGridTemplateRows) ||
      mGridTemplateAreas != aNewData.mGridTemplateAreas ||
      mGridAutoColumnsMin != aNewData.mGridAutoColumnsMin ||
      mGridAutoColumnsMax != aNewData.mGridAutoColumnsMax ||
      mGridAutoRowsMin != aNewData.mGridAutoRowsMin ||
      mGridAutoRowsMax != aNewData.mGridAutoRowsMax ||
      mGridAutoFlow != aNewData.mGridAutoFlow) {
    return hint | nsChangeHint_AllReflowHints;
  }

  // Properties that apply to grid items:
  // FIXME: only for grid items
  // (ie. parent frame is 'display: grid' or 'display: inline-grid')
  if (mGridColumnStart != aNewData.mGridColumnStart ||
      mGridColumnEnd != aNewData.mGridColumnEnd ||
      mGridRowStart != aNewData.mGridRowStart ||
      mGridRowEnd != aNewData.mGridRowEnd ||
      mGridColumnGap != aNewData.mGridColumnGap ||
      mGridRowGap != aNewData.mGridRowGap) {
    return hint | nsChangeHint_AllReflowHints;
  }

  // Changing 'justify-content/items/self' might affect the positioning,
  // but it won't affect any sizing.
  if (mJustifyContent != aNewData.mJustifyContent ||
      mJustifyItems != aNewData.mJustifyItems ||
      mJustifySelf != aNewData.mJustifySelf) {
    hint |= nsChangeHint_NeedReflow;
  }

  // No need to do anything if mSpecifiedJustifyItems changes, as long as
  // mJustifyItems (tested above) is unchanged.
  if (mSpecifiedJustifyItems != aNewData.mSpecifiedJustifyItems) {
    hint |= nsChangeHint_NeutralChange;
  }

  // 'align-content' doesn't apply to a single-line flexbox but we don't know
  // if we're a flex container at this point so we can't optimize for that.
  if (mAlignContent != aNewData.mAlignContent) {
    hint |= nsChangeHint_NeedReflow;
  }

  bool widthChanged = mWidth != aNewData.mWidth ||
                      mMinWidth != aNewData.mMinWidth ||
                      mMaxWidth != aNewData.mMaxWidth;
  bool heightChanged = mHeight != aNewData.mHeight ||
                       mMinHeight != aNewData.mMinHeight ||
                       mMaxHeight != aNewData.mMaxHeight;

  // If aOldStyleVisibility is null, we don't need to bother with any of
  // these tests, since we know that the element never had its
  // nsStyleVisibility accessed, which means it couldn't have done
  // layout.
  // Note that we pass an nsStyleVisibility here because we don't want
  // to cause a new struct to be computed during
  // nsStyleContext::CalcStyleDifference, which can lead to incorrect
  // style data.
  // It doesn't matter whether we're looking at the old or new
  // visibility struct, since a change between vertical and horizontal
  // writing-mode will cause a reframe, and it's easier to pass the old.
  if (aOldStyleVisibility) {
    bool isVertical = WritingMode(aOldStyleVisibility).IsVertical();
    if (isVertical ? widthChanged : heightChanged) {
      hint |= nsChangeHint_ReflowHintsForBSizeChange;
    }

    if (isVertical ? heightChanged : widthChanged) {
      hint |= nsChangeHint_ReflowHintsForISizeChange;
    }
  } else {
    if (widthChanged || heightChanged) {
      hint |= nsChangeHint_NeutralChange;
    }
  }

  // If any of the offsets have changed, then return the respective hints
  // so that we would hopefully be able to avoid reflowing.
  // Note that it is possible that we'll need to reflow when processing
  // restyles, but we don't have enough information to make a good decision
  // right now.
  // Don't try to handle changes between "auto" and non-auto efficiently;
  // that's tricky to do and will hardly ever be able to avoid a reflow.
  if (mOffset != aNewData.mOffset) {
    if (IsAutonessEqual(mOffset, aNewData.mOffset)) {
      hint |=
          nsChangeHint_RecomputePosition | nsChangeHint_UpdateParentOverflow;
    } else {
      hint |= nsChangeHint_AllReflowHints;
    }
  }
  return hint;
}

/* static */ bool nsStylePosition::WidthCoordDependsOnContainer(
    const nsStyleCoord& aCoord) {
  return aCoord.HasPercent() ||
         (aCoord.GetUnit() == eStyleUnit_Enumerated &&
          (aCoord.GetIntValue() == NS_STYLE_WIDTH_FIT_CONTENT ||
           aCoord.GetIntValue() == NS_STYLE_WIDTH_AVAILABLE));
}

uint8_t nsStylePosition::UsedAlignSelf(nsStyleContext* aParent) const {
  if (mAlignSelf != NS_STYLE_ALIGN_AUTO) {
    return mAlignSelf;
  }
  if (MOZ_LIKELY(aParent)) {
    auto parentAlignItems = aParent->StylePosition()->mAlignItems;
    MOZ_ASSERT(!(parentAlignItems & NS_STYLE_ALIGN_LEGACY),
               "align-items can't have 'legacy'");
    return parentAlignItems;
  }
  return NS_STYLE_ALIGN_NORMAL;
}

uint8_t nsStylePosition::UsedJustifySelf(nsStyleContext* aParent) const {
  if (mJustifySelf != NS_STYLE_JUSTIFY_AUTO) {
    return mJustifySelf;
  }
  if (MOZ_LIKELY(aParent)) {
    auto inheritedJustifyItems = aParent->StylePosition()->mJustifyItems;
    return inheritedJustifyItems & ~NS_STYLE_JUSTIFY_LEGACY;
  }
  return NS_STYLE_JUSTIFY_NORMAL;
}

static StaticAutoPtr<nsStyleGridTemplate> sDefaultGridTemplate;

static const nsStyleGridTemplate& DefaultGridTemplate() {
  if (!sDefaultGridTemplate) {
    sDefaultGridTemplate = new nsStyleGridTemplate;
    ClearOnShutdown(&sDefaultGridTemplate);
  }
  return *sDefaultGridTemplate;
}

const nsStyleGridTemplate& nsStylePosition::GridTemplateColumns() const {
  return mGridTemplateColumns ? *mGridTemplateColumns : DefaultGridTemplate();
}

const nsStyleGridTemplate& nsStylePosition::GridTemplateRows() const {
  return mGridTemplateRows ? *mGridTemplateRows : DefaultGridTemplate();
}

// --------------------
// nsStyleTable
//

nsStyleTable::nsStyleTable(const nsPresContext* aContext)
    : mLayoutStrategy(NS_STYLE_TABLE_LAYOUT_AUTO), mSpan(1) {
  MOZ_COUNT_CTOR(nsStyleTable);
}

nsStyleTable::~nsStyleTable() { MOZ_COUNT_DTOR(nsStyleTable); }

nsStyleTable::nsStyleTable(const nsStyleTable& aSource)
    : mLayoutStrategy(aSource.mLayoutStrategy), mSpan(aSource.mSpan) {
  MOZ_COUNT_CTOR(nsStyleTable);
}

nsChangeHint nsStyleTable::CalcDifference(const nsStyleTable& aNewData) const {
  if (mSpan != aNewData.mSpan || mLayoutStrategy != aNewData.mLayoutStrategy) {
    return nsChangeHint_ReconstructFrame;
  }
  return nsChangeHint(0);
}

// -----------------------
// nsStyleTableBorder

nsStyleTableBorder::nsStyleTableBorder(const nsPresContext* aContext)
    : mBorderSpacingCol(0),
      mBorderSpacingRow(0),
      mBorderCollapse(NS_STYLE_BORDER_SEPARATE),
      mCaptionSide(NS_STYLE_CAPTION_SIDE_TOP),
      mEmptyCells(NS_STYLE_TABLE_EMPTY_CELLS_SHOW) {
  MOZ_COUNT_CTOR(nsStyleTableBorder);
}

nsStyleTableBorder::~nsStyleTableBorder() {
  MOZ_COUNT_DTOR(nsStyleTableBorder);
}

nsStyleTableBorder::nsStyleTableBorder(const nsStyleTableBorder& aSource)
    : mBorderSpacingCol(aSource.mBorderSpacingCol),
      mBorderSpacingRow(aSource.mBorderSpacingRow),
      mBorderCollapse(aSource.mBorderCollapse),
      mCaptionSide(aSource.mCaptionSide),
      mEmptyCells(aSource.mEmptyCells) {
  MOZ_COUNT_CTOR(nsStyleTableBorder);
}

nsChangeHint nsStyleTableBorder::CalcDifference(
    const nsStyleTableBorder& aNewData) const {
  // Border-collapse changes need a reframe, because we use a different frame
  // class for table cells in the collapsed border model.  This is used to
  // conserve memory when using the separated border model (collapsed borders
  // require extra state to be stored).
  if (mBorderCollapse != aNewData.mBorderCollapse) {
    return nsChangeHint_ReconstructFrame;
  }

  if ((mCaptionSide == aNewData.mCaptionSide) &&
      (mBorderSpacingCol == aNewData.mBorderSpacingCol) &&
      (mBorderSpacingRow == aNewData.mBorderSpacingRow)) {
    if (mEmptyCells == aNewData.mEmptyCells) {
      return nsChangeHint(0);
    }
    return NS_STYLE_HINT_VISUAL;
  } else {
    return NS_STYLE_HINT_REFLOW;
  }
}

// --------------------
// nsStyleColor
//

nsStyleColor::nsStyleColor(const nsPresContext* aContext)
    : mColor(aContext->DefaultColor()) {
  MOZ_COUNT_CTOR(nsStyleColor);
}

nsStyleColor::nsStyleColor(const nsStyleColor& aSource)
    : mColor(aSource.mColor) {
  MOZ_COUNT_CTOR(nsStyleColor);
}

nsChangeHint nsStyleColor::CalcDifference(const nsStyleColor& aNewData) const {
  if (mColor == aNewData.mColor) {
    return nsChangeHint(0);
  }
  return nsChangeHint_RepaintFrame;
}

// --------------------
// nsStyleGradient
//
bool nsStyleGradient::operator==(const nsStyleGradient& aOther) const {
  MOZ_ASSERT(mSize == NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER ||
                 mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR,
             "incorrect combination of shape and size");
  MOZ_ASSERT(aOther.mSize == NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER ||
                 aOther.mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR,
             "incorrect combination of shape and size");

  if (mShape != aOther.mShape || mSize != aOther.mSize ||
      mRepeating != aOther.mRepeating ||
      mLegacySyntax != aOther.mLegacySyntax ||
      mMozLegacySyntax != aOther.mMozLegacySyntax ||
      mBgPosX != aOther.mBgPosX || mBgPosY != aOther.mBgPosY ||
      mAngle != aOther.mAngle || mRadiusX != aOther.mRadiusX ||
      mRadiusY != aOther.mRadiusY) {
    return false;
  }

  if (mStops.Length() != aOther.mStops.Length()) {
    return false;
  }

  for (uint32_t i = 0; i < mStops.Length(); i++) {
    const auto& stop1 = mStops[i];
    const auto& stop2 = aOther.mStops[i];
    if (stop1.mLocation != stop2.mLocation ||
        stop1.mIsInterpolationHint != stop2.mIsInterpolationHint ||
        (!stop1.mIsInterpolationHint && stop1.mColor != stop2.mColor)) {
      return false;
    }
  }

  return true;
}

nsStyleGradient::nsStyleGradient()
    : mShape(NS_STYLE_GRADIENT_SHAPE_LINEAR),
      mSize(NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER),
      mRepeating(false),
      mLegacySyntax(false),
      mMozLegacySyntax(false) {}

bool nsStyleGradient::IsOpaque() {
  for (uint32_t i = 0; i < mStops.Length(); i++) {
    if (NS_GET_A(mStops[i].mColor) < 255) {
      return false;
    }
  }
  return true;
}

bool nsStyleGradient::HasCalc() {
  for (uint32_t i = 0; i < mStops.Length(); i++) {
    if (mStops[i].mLocation.IsCalcUnit()) {
      return true;
    }
  }
  return mBgPosX.IsCalcUnit() || mBgPosY.IsCalcUnit() || mAngle.IsCalcUnit() ||
         mRadiusX.IsCalcUnit() || mRadiusY.IsCalcUnit();
}

// --------------------
// nsStyleImageRequest

/**
 * Runnable to release the nsStyleImageRequest's mRequestProxy,
 * mImageValue and mImageTracker on the main thread, and to perform
 * any necessary unlocking and untracking of the image.
 */
class StyleImageRequestCleanupTask : public mozilla::Runnable {
 public:
  typedef nsStyleImageRequest::Mode Mode;

  StyleImageRequestCleanupTask(Mode aModeFlags,
                               already_AddRefed<imgRequestProxy> aRequestProxy,
                               already_AddRefed<css::ImageValue> aImageValue,
                               already_AddRefed<ImageTracker> aImageTracker)
      : mozilla::Runnable("StyleImageRequestCleanupTask"),
        mModeFlags(aModeFlags),
        mRequestProxy(aRequestProxy),
        mImageValue(aImageValue),
        mImageTracker(aImageTracker) {}

  NS_IMETHOD Run() final {
    MOZ_ASSERT(!mRequestProxy || NS_IsMainThread(),
               "If mRequestProxy is non-null, we need to run on main thread!");

    if (!mRequestProxy) {
      return NS_OK;
    }

    if (mModeFlags & Mode::Track) {
      MOZ_ASSERT(mImageTracker);
      mImageTracker->Remove(mRequestProxy);
    } else {
      mRequestProxy->UnlockImage();
    }

    if (mModeFlags & Mode::Discard) {
      mRequestProxy->RequestDiscard();
    }

    return NS_OK;
  }

 protected:
  virtual ~StyleImageRequestCleanupTask() {
    MOZ_ASSERT(mImageValue->mRequests.Count() == 0 || NS_IsMainThread(),
               "If mImageValue has any mRequests, we need to run on main "
               "thread to release ImageValues!");
    MOZ_ASSERT((!mRequestProxy && !mImageTracker) || NS_IsMainThread(),
               "mRequestProxy and mImageTracker's destructor need to run "
               "on the main thread!");
  }

 private:
  Mode mModeFlags;
  // Since we always dispatch this runnable to the main thread, these will be
  // released on the main thread when the runnable itself is released.
  RefPtr<imgRequestProxy> mRequestProxy;
  RefPtr<css::ImageValue> mImageValue;
  RefPtr<ImageTracker> mImageTracker;
};

nsStyleImageRequest::nsStyleImageRequest(Mode aModeFlags,
                                         imgRequestProxy* aRequestProxy,
                                         css::ImageValue* aImageValue,
                                         ImageTracker* aImageTracker)
    : mRequestProxy(aRequestProxy),
      mImageValue(aImageValue),
      mImageTracker(aImageTracker),
      mModeFlags(aModeFlags),
      mResolved(true) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aImageValue);
  MOZ_ASSERT(!!(aModeFlags & Mode::Track) == !!aImageTracker);

  if (mRequestProxy) {
    MaybeTrackAndLock();
  }
}

nsStyleImageRequest::nsStyleImageRequest(Mode aModeFlags,
                                         mozilla::css::ImageValue* aImageValue)
    : mImageValue(aImageValue), mModeFlags(aModeFlags), mResolved(false) {}

nsStyleImageRequest::~nsStyleImageRequest() {
  // We may or may not be being destroyed on the main thread.  To clean
  // up, we must untrack and unlock the image (depending on mModeFlags),
  // and release mRequestProxy and mImageValue, all on the main thread.
  {
    RefPtr<StyleImageRequestCleanupTask> task =
        new StyleImageRequestCleanupTask(mModeFlags, mRequestProxy.forget(),
                                         mImageValue.forget(),
                                         mImageTracker.forget());
    if (NS_IsMainThread()) {
      task->Run();
    } else {
      if (mDocGroup) {
        mDocGroup->Dispatch(TaskCategory::Other, task.forget());
      } else {
        // if Resolve was not called at some point, mDocGroup is not set.
        SystemGroup::Dispatch(TaskCategory::Other, task.forget());
      }
    }
  }

  MOZ_ASSERT(!mRequestProxy);
  MOZ_ASSERT(!mImageValue);
  MOZ_ASSERT(!mImageTracker);
}

bool nsStyleImageRequest::Resolve(nsPresContext* aPresContext,
                                  const nsStyleImageRequest* aOldImageRequest) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!IsResolved(), "already resolved");
  MOZ_ASSERT(aPresContext);

  mResolved = true;

  nsIDocument* doc = aPresContext->Document();
  nsIURI* docURI = doc->GetDocumentURI();
  if (GetImageValue()->HasRef()) {
    bool isEqualExceptRef = false;
    RefPtr<nsIURI> imageURI = GetImageURI();
    imageURI->EqualsExceptRef(docURI, &isEqualExceptRef);
    if (isEqualExceptRef) {
      // Prevent loading an internal resource.
      return true;
    }
  }

  // TODO(emilio, bug 1440442): This is a hackaround to avoid flickering due the
  // lack of non-http image caching in imagelib (bug 1406134), which causes
  // stuff like bug 1439285. Cleanest fix if that doesn't get fixed is bug
  // 1440305, but that seems too risky, and a lot of work to do before 60.
  //
  // Once that's fixed, the "old style" argument to FinishStyle can go away.
  if (aPresContext->IsChrome() && aOldImageRequest &&
      aOldImageRequest->IsResolved() && DefinitelyEquals(*aOldImageRequest)) {
    MOZ_ASSERT(aOldImageRequest->mDocGroup == doc->GetDocGroup());
    MOZ_ASSERT(mModeFlags == aOldImageRequest->mModeFlags);

    mDocGroup = aOldImageRequest->mDocGroup;
    mImageValue = aOldImageRequest->mImageValue;
    mRequestProxy = aOldImageRequest->mRequestProxy;
  } else {
    mDocGroup = doc->GetDocGroup();
    mImageValue->Initialize(doc);

    nsCSSValue value;
    value.SetImageValue(mImageValue);
    mRequestProxy = value.GetPossiblyStaticImageValue(aPresContext->Document(),
                                                      aPresContext);
  }

  if (!mRequestProxy) {
    // The URL resolution or image load failed.
    return false;
  }

  if (mModeFlags & Mode::Track) {
    mImageTracker = doc->ImageTracker();
  }

  MaybeTrackAndLock();
  return true;
}

void nsStyleImageRequest::MaybeTrackAndLock() {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(IsResolved());
  MOZ_ASSERT(mRequestProxy);

  if (mModeFlags & Mode::Track) {
    MOZ_ASSERT(mImageTracker);
    mImageTracker->Add(mRequestProxy);
  } else {
    MOZ_ASSERT(!mImageTracker);
    mRequestProxy->LockImage();
  }
}

bool nsStyleImageRequest::DefinitelyEquals(
    const nsStyleImageRequest& aOther) const {
  return DefinitelyEqualURIs(mImageValue, aOther.mImageValue);
}

// --------------------
// CachedBorderImageData
//
void CachedBorderImageData::SetCachedSVGViewportSize(
    const mozilla::Maybe<nsSize>& aSVGViewportSize) {
  mCachedSVGViewportSize = aSVGViewportSize;
}

const mozilla::Maybe<nsSize>&
CachedBorderImageData::GetCachedSVGViewportSize() {
  return mCachedSVGViewportSize;
}

struct PurgeCachedImagesTask : mozilla::Runnable {
  PurgeCachedImagesTask() : mozilla::Runnable("PurgeCachedImagesTask") {}
  NS_IMETHOD Run() final {
    mSubImages.Clear();
    return NS_OK;
  }

  nsCOMArray<imgIContainer> mSubImages;
};

void CachedBorderImageData::PurgeCachedImages() {
  if (ServoStyleSet::IsInServoTraversal()) {
    RefPtr<PurgeCachedImagesTask> task = new PurgeCachedImagesTask();
    task->mSubImages.SwapElements(mSubImages);
    // This will run the task immediately if we're already on the main thread,
    // but that is fine.
    NS_DispatchToMainThread(task.forget());
  } else {
    mSubImages.Clear();
  }
}

void CachedBorderImageData::SetSubImage(uint8_t aIndex,
                                        imgIContainer* aSubImage) {
  mSubImages.ReplaceObjectAt(aSubImage, aIndex);
}

imgIContainer* CachedBorderImageData::GetSubImage(uint8_t aIndex) {
  imgIContainer* subImage = nullptr;
  if (aIndex < mSubImages.Count()) subImage = mSubImages[aIndex];
  return subImage;
}

// --------------------
// nsStyleImage
//

nsStyleImage::nsStyleImage() : mType(eStyleImageType_Null), mCropRect(nullptr) {
  MOZ_COUNT_CTOR(nsStyleImage);
}

nsStyleImage::~nsStyleImage() {
  MOZ_COUNT_DTOR(nsStyleImage);
  if (mType != eStyleImageType_Null) {
    SetNull();
  }
}

nsStyleImage::nsStyleImage(const nsStyleImage& aOther)
    : mType(eStyleImageType_Null), mCropRect(nullptr) {
  // We need our own copy constructor because we don't want
  // to copy the reference count
  MOZ_COUNT_CTOR(nsStyleImage);
  DoCopy(aOther);
}

nsStyleImage& nsStyleImage::operator=(const nsStyleImage& aOther) {
  if (this != &aOther) {
    DoCopy(aOther);
  }

  return *this;
}

void nsStyleImage::DoCopy(const nsStyleImage& aOther) {
  SetNull();

  if (aOther.mType == eStyleImageType_Image) {
    SetImageRequest(do_AddRef(aOther.mImage));
  } else if (aOther.mType == eStyleImageType_Gradient) {
    SetGradientData(aOther.mGradient);
  } else if (aOther.mType == eStyleImageType_Element) {
    SetElementId(do_AddRef(aOther.mElementId));
  } else if (aOther.mType == eStyleImageType_URL) {
    SetURLValue(do_AddRef(aOther.mURLValue));
  }

  UniquePtr<nsStyleSides> cropRectCopy;
  if (aOther.mCropRect) {
    cropRectCopy = MakeUnique<nsStyleSides>(*aOther.mCropRect.get());
  }
  SetCropRect(Move(cropRectCopy));
}

void nsStyleImage::SetNull() {
  if (mType == eStyleImageType_Gradient) {
    mGradient->Release();
  } else if (mType == eStyleImageType_Image) {
    NS_RELEASE(mImage);
  } else if (mType == eStyleImageType_Element) {
    NS_RELEASE(mElementId);
  } else if (mType == eStyleImageType_URL) {
    NS_RELEASE(mURLValue);
  }

  mType = eStyleImageType_Null;
  mCropRect = nullptr;
}

void nsStyleImage::SetImageRequest(
    already_AddRefed<nsStyleImageRequest> aImage) {
  RefPtr<nsStyleImageRequest> image = aImage;

  if (mType != eStyleImageType_Null) {
    SetNull();
  }

  if (image) {
    mImage = image.forget().take();
    mType = eStyleImageType_Image;
  }
  if (mCachedBIData) {
    mCachedBIData->PurgeCachedImages();
  }
}

void nsStyleImage::SetGradientData(nsStyleGradient* aGradient) {
  if (aGradient) {
    aGradient->AddRef();
  }

  if (mType != eStyleImageType_Null) {
    SetNull();
  }

  if (aGradient) {
    mGradient = aGradient;
    mType = eStyleImageType_Gradient;
  }
}

void nsStyleImage::SetElementId(already_AddRefed<nsAtom> aElementId) {
  if (mType != eStyleImageType_Null) {
    SetNull();
  }

  if (RefPtr<nsAtom> atom = aElementId) {
    mElementId = atom.forget().take();
    mType = eStyleImageType_Element;
  }
}

void nsStyleImage::SetCropRect(UniquePtr<nsStyleSides> aCropRect) {
  mCropRect = Move(aCropRect);
}

void nsStyleImage::SetURLValue(already_AddRefed<URLValue> aValue) {
  RefPtr<URLValue> value = aValue;

  if (mType != eStyleImageType_Null) {
    SetNull();
  }

  if (value) {
    mURLValue = value.forget().take();
    mType = eStyleImageType_URL;
  }
}

static int32_t ConvertToPixelCoord(const nsStyleCoord& aCoord,
                                   int32_t aPercentScale) {
  double pixelValue;
  switch (aCoord.GetUnit()) {
    case eStyleUnit_Percent:
      pixelValue = aCoord.GetPercentValue() * aPercentScale;
      break;
    case eStyleUnit_Factor:
      pixelValue = aCoord.GetFactorValue();
      break;
    default:
      NS_NOTREACHED("unexpected unit for image crop rect");
      return 0;
  }
  MOZ_ASSERT(pixelValue >= 0, "we ensured non-negative while parsing");
  pixelValue = std::min(pixelValue, double(INT32_MAX));  // avoid overflow
  return NS_lround(pixelValue);
}

already_AddRefed<nsIURI> nsStyleImageRequest::GetImageURI() const {
  nsCOMPtr<nsIURI> uri;

  if (mRequestProxy) {
    mRequestProxy->GetURI(getter_AddRefs(uri));
    if (uri) {
      return uri.forget();
    }
  }

  // If we had some problem resolving the mRequestProxy, use the URL stored
  // in the mImageValue.
  if (!mImageValue) {
    return nullptr;
  }

  uri = mImageValue->GetURI();
  return uri.forget();
}

bool nsStyleImage::ComputeActualCropRect(nsIntRect& aActualCropRect,
                                         bool* aIsEntireImage) const {
  MOZ_ASSERT(mType == eStyleImageType_Image,
             "This function is designed to be used only when mType"
             "is eStyleImageType_Image.");

  imgRequestProxy* req = GetImageData();
  if (!req) {
    return false;
  }

  nsCOMPtr<imgIContainer> imageContainer;
  req->GetImage(getter_AddRefs(imageContainer));
  if (!imageContainer) {
    return false;
  }

  nsIntSize imageSize;
  imageContainer->GetWidth(&imageSize.width);
  imageContainer->GetHeight(&imageSize.height);
  if (imageSize.width <= 0 || imageSize.height <= 0) {
    return false;
  }

  int32_t left = ConvertToPixelCoord(mCropRect->GetLeft(), imageSize.width);
  int32_t top = ConvertToPixelCoord(mCropRect->GetTop(), imageSize.height);
  int32_t right = ConvertToPixelCoord(mCropRect->GetRight(), imageSize.width);
  int32_t bottom =
      ConvertToPixelCoord(mCropRect->GetBottom(), imageSize.height);

  // IntersectRect() returns an empty rect if we get negative width or height
  nsIntRect cropRect(left, top, right - left, bottom - top);
  nsIntRect imageRect(nsIntPoint(0, 0), imageSize);
  aActualCropRect.IntersectRect(imageRect, cropRect);

  if (aIsEntireImage) {
    *aIsEntireImage = aActualCropRect.IsEqualInterior(imageRect);
  }
  return true;
}

bool nsStyleImage::StartDecoding() const {
  if (mType == eStyleImageType_Image) {
    imgRequestProxy* req = GetImageData();
    if (!req) {
      return false;
    }
    return req->StartDecodingWithResult(imgIContainer::FLAG_ASYNC_NOTIFY);
  }
  // null image types always return false from IsComplete, so we do the same
  // here.
  return mType != eStyleImageType_Null ? true : false;
}

bool nsStyleImage::IsOpaque() const {
  if (!IsComplete()) {
    return false;
  }

  if (mType == eStyleImageType_Gradient) {
    return mGradient->IsOpaque();
  }

  if (mType == eStyleImageType_Element || mType == eStyleImageType_URL) {
    return false;
  }

  MOZ_ASSERT(mType == eStyleImageType_Image, "unexpected image type");
  MOZ_ASSERT(GetImageData(), "should've returned earlier above");

  nsCOMPtr<imgIContainer> imageContainer;
  GetImageData()->GetImage(getter_AddRefs(imageContainer));
  MOZ_ASSERT(imageContainer, "IsComplete() said image container is ready");

  // Check if the crop region of the image is opaque.
  if (imageContainer->WillDrawOpaqueNow()) {
    if (!mCropRect) {
      return true;
    }

    // Must make sure if mCropRect contains at least a pixel.
    // XXX Is this optimization worth it? Maybe I should just return false.
    nsIntRect actualCropRect;
    return ComputeActualCropRect(actualCropRect) && !actualCropRect.IsEmpty();
  }

  return false;
}

bool nsStyleImage::IsComplete() const {
  switch (mType) {
    case eStyleImageType_Null:
      return false;
    case eStyleImageType_Gradient:
    case eStyleImageType_Element:
    case eStyleImageType_URL:
      return true;
    case eStyleImageType_Image: {
      if (!IsResolved()) {
        return false;
      }
      imgRequestProxy* req = GetImageData();
      if (!req) {
        return false;
      }
      uint32_t status = imgIRequest::STATUS_ERROR;
      return NS_SUCCEEDED(req->GetImageStatus(&status)) &&
             (status & imgIRequest::STATUS_SIZE_AVAILABLE) &&
             (status & imgIRequest::STATUS_FRAME_COMPLETE);
    }
    default:
      NS_NOTREACHED("unexpected image type");
      return false;
  }
}

bool nsStyleImage::IsLoaded() const {
  switch (mType) {
    case eStyleImageType_Null:
      return false;
    case eStyleImageType_Gradient:
    case eStyleImageType_Element:
    case eStyleImageType_URL:
      return true;
    case eStyleImageType_Image: {
      imgRequestProxy* req = GetImageData();
      if (!req) {
        return false;
      }
      uint32_t status = imgIRequest::STATUS_ERROR;
      return NS_SUCCEEDED(req->GetImageStatus(&status)) &&
             !(status & imgIRequest::STATUS_ERROR) &&
             (status & imgIRequest::STATUS_LOAD_COMPLETE);
    }
    default:
      NS_NOTREACHED("unexpected image type");
      return false;
  }
}

static inline bool EqualRects(const UniquePtr<nsStyleSides>& aRect1,
                              const UniquePtr<nsStyleSides>& aRect2) {
  return aRect1 == aRect2 || /* handles null== null, and optimize */
         (aRect1 && aRect2 && *aRect1 == *aRect2);
}

bool nsStyleImage::operator==(const nsStyleImage& aOther) const {
  if (mType != aOther.mType) {
    return false;
  }

  if (!EqualRects(mCropRect, aOther.mCropRect)) {
    return false;
  }

  if (mType == eStyleImageType_Image) {
    return DefinitelyEqualImages(mImage, aOther.mImage);
  }

  if (mType == eStyleImageType_Gradient) {
    return *mGradient == *aOther.mGradient;
  }

  if (mType == eStyleImageType_Element) {
    return mElementId == aOther.mElementId;
  }

  if (mType == eStyleImageType_URL) {
    return DefinitelyEqualURIs(mURLValue, aOther.mURLValue);
  }

  return true;
}

void nsStyleImage::PurgeCacheForViewportChange(
    const mozilla::Maybe<nsSize>& aSVGViewportSize,
    const bool aHasIntrinsicRatio) const {
  EnsureCachedBIData();

  // If we're redrawing with a different viewport-size than we used for our
  // cached subimages, then we can't trust that our subimages are valid;
  // any percent sizes/positions in our SVG doc may be different now. Purge!
  // (We don't have to purge if the SVG document has an intrinsic ratio,
  // though, because the actual size of elements in SVG documant's coordinate
  // axis are fixed in this case.)
  if (aSVGViewportSize != mCachedBIData->GetCachedSVGViewportSize() &&
      !aHasIntrinsicRatio) {
    mCachedBIData->PurgeCachedImages();
    mCachedBIData->SetCachedSVGViewportSize(aSVGViewportSize);
  }
}

already_AddRefed<nsIURI> nsStyleImage::GetImageURI() const {
  if (mType != eStyleImageType_Image) {
    return nullptr;
  }

  nsCOMPtr<nsIURI> uri = mImage->GetImageURI();
  return uri.forget();
}

css::URLValueData* nsStyleImage::GetURLValue() const {
  if (mType == eStyleImageType_Image) {
    return mImage->GetImageValue();
  } else if (mType == eStyleImageType_URL) {
    return mURLValue;
  }

  return nullptr;
}

// --------------------
// nsStyleImageLayers
//

const nsCSSPropertyID nsStyleImageLayers::kBackgroundLayerTable[] = {
    eCSSProperty_background,             // shorthand
    eCSSProperty_background_color,       // color
    eCSSProperty_background_image,       // image
    eCSSProperty_background_repeat,      // repeat
    eCSSProperty_background_position_x,  // positionX
    eCSSProperty_background_position_y,  // positionY
    eCSSProperty_background_clip,        // clip
    eCSSProperty_background_origin,      // origin
    eCSSProperty_background_size,        // size
    eCSSProperty_background_attachment,  // attachment
    eCSSProperty_UNKNOWN,                // maskMode
    eCSSProperty_UNKNOWN                 // composite
};

const nsCSSPropertyID nsStyleImageLayers::kMaskLayerTable[] = {
    eCSSProperty_mask,             // shorthand
    eCSSProperty_UNKNOWN,          // color
    eCSSProperty_mask_image,       // image
    eCSSProperty_mask_repeat,      // repeat
    eCSSProperty_mask_position_x,  // positionX
    eCSSProperty_mask_position_y,  // positionY
    eCSSProperty_mask_clip,        // clip
    eCSSProperty_mask_origin,      // origin
    eCSSProperty_mask_size,        // size
    eCSSProperty_UNKNOWN,          // attachment
    eCSSProperty_mask_mode,        // maskMode
    eCSSProperty_mask_composite    // composite
};

nsStyleImageLayers::nsStyleImageLayers(nsStyleImageLayers::LayerType aType)
    : mAttachmentCount(1),
      mClipCount(1),
      mOriginCount(1),
      mRepeatCount(1),
      mPositionXCount(1),
      mPositionYCount(1),
      mImageCount(1),
      mSizeCount(1),
      mMaskModeCount(1),
      mBlendModeCount(1),
      mCompositeCount(1),
      mLayers(nsStyleAutoArray<Layer>::WITH_SINGLE_INITIAL_ELEMENT) {
  MOZ_COUNT_CTOR(nsStyleImageLayers);

  // Ensure first layer is initialized as specified layer type
  mLayers[0].Initialize(aType);
}

nsStyleImageLayers::nsStyleImageLayers(const nsStyleImageLayers& aSource)
    : mAttachmentCount(aSource.mAttachmentCount),
      mClipCount(aSource.mClipCount),
      mOriginCount(aSource.mOriginCount),
      mRepeatCount(aSource.mRepeatCount),
      mPositionXCount(aSource.mPositionXCount),
      mPositionYCount(aSource.mPositionYCount),
      mImageCount(aSource.mImageCount),
      mSizeCount(aSource.mSizeCount),
      mMaskModeCount(aSource.mMaskModeCount),
      mBlendModeCount(aSource.mBlendModeCount),
      mCompositeCount(aSource.mCompositeCount),
      mLayers(aSource.mLayers)  // deep copy
{
  MOZ_COUNT_CTOR(nsStyleImageLayers);
  // If the deep copy of mLayers failed, truncate the counts.
  uint32_t count = mLayers.Length();
  if (count != aSource.mLayers.Length()) {
    NS_WARNING("truncating counts due to out-of-memory");
    mAttachmentCount = std::max(mAttachmentCount, count);
    mClipCount = std::max(mClipCount, count);
    mOriginCount = std::max(mOriginCount, count);
    mRepeatCount = std::max(mRepeatCount, count);
    mPositionXCount = std::max(mPositionXCount, count);
    mPositionYCount = std::max(mPositionYCount, count);
    mImageCount = std::max(mImageCount, count);
    mSizeCount = std::max(mSizeCount, count);
    mMaskModeCount = std::max(mMaskModeCount, count);
    mBlendModeCount = std::max(mBlendModeCount, count);
    mCompositeCount = std::max(mCompositeCount, count);
  }
}

nsChangeHint nsStyleImageLayers::CalcDifference(
    const nsStyleImageLayers& aNewLayers,
    nsStyleImageLayers::LayerType aType) const {
  nsChangeHint hint = nsChangeHint(0);

  const nsStyleImageLayers& moreLayers =
      mImageCount > aNewLayers.mImageCount ? *this : aNewLayers;
  const nsStyleImageLayers& lessLayers =
      mImageCount > aNewLayers.mImageCount ? aNewLayers : *this;

  NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, moreLayers) {
    if (i < lessLayers.mImageCount) {
      nsChangeHint layerDifference =
          moreLayers.mLayers[i].CalcDifference(lessLayers.mLayers[i]);
      hint |= layerDifference;
      if (layerDifference && ((moreLayers.mLayers[i].mImage.GetType() ==
                               eStyleImageType_Element) ||
                              (lessLayers.mLayers[i].mImage.GetType() ==
                               eStyleImageType_Element))) {
        hint |= nsChangeHint_UpdateEffects | nsChangeHint_RepaintFrame;
      }
    } else {
      hint |= nsChangeHint_RepaintFrame;
      if (moreLayers.mLayers[i].mImage.GetType() == eStyleImageType_Element) {
        hint |= nsChangeHint_UpdateEffects | nsChangeHint_RepaintFrame;
      }
    }
  }

  if (aType == nsStyleImageLayers::LayerType::Mask &&
      mImageCount != aNewLayers.mImageCount) {
    hint |= nsChangeHint_UpdateEffects;
  }

  if (hint) {
    return hint;
  }

  if (mAttachmentCount != aNewLayers.mAttachmentCount ||
      mBlendModeCount != aNewLayers.mBlendModeCount ||
      mClipCount != aNewLayers.mClipCount ||
      mCompositeCount != aNewLayers.mCompositeCount ||
      mMaskModeCount != aNewLayers.mMaskModeCount ||
      mOriginCount != aNewLayers.mOriginCount ||
      mRepeatCount != aNewLayers.mRepeatCount ||
      mPositionXCount != aNewLayers.mPositionXCount ||
      mPositionYCount != aNewLayers.mPositionYCount ||
      mSizeCount != aNewLayers.mSizeCount) {
    hint |= nsChangeHint_NeutralChange;
  }

  return hint;
}

nsStyleImageLayers& nsStyleImageLayers::operator=(
    const nsStyleImageLayers& aOther) {
  mAttachmentCount = aOther.mAttachmentCount;
  mClipCount = aOther.mClipCount;
  mOriginCount = aOther.mOriginCount;
  mRepeatCount = aOther.mRepeatCount;
  mPositionXCount = aOther.mPositionXCount;
  mPositionYCount = aOther.mPositionYCount;
  mImageCount = aOther.mImageCount;
  mSizeCount = aOther.mSizeCount;
  mMaskModeCount = aOther.mMaskModeCount;
  mBlendModeCount = aOther.mBlendModeCount;
  mCompositeCount = aOther.mCompositeCount;
  mLayers = aOther.mLayers;

  uint32_t count = mLayers.Length();
  if (count != aOther.mLayers.Length()) {
    NS_WARNING("truncating counts due to out-of-memory");
    mAttachmentCount = std::max(mAttachmentCount, count);
    mClipCount = std::max(mClipCount, count);
    mOriginCount = std::max(mOriginCount, count);
    mRepeatCount = std::max(mRepeatCount, count);
    mPositionXCount = std::max(mPositionXCount, count);
    mPositionYCount = std::max(mPositionYCount, count);
    mImageCount = std::max(mImageCount, count);
    mSizeCount = std::max(mSizeCount, count);
    mMaskModeCount = std::max(mMaskModeCount, count);
    mBlendModeCount = std::max(mBlendModeCount, count);
    mCompositeCount = std::max(mCompositeCount, count);
  }

  return *this;
}

nsStyleImageLayers& nsStyleImageLayers::operator=(nsStyleImageLayers&& aOther) {
  mAttachmentCount = aOther.mAttachmentCount;
  mClipCount = aOther.mClipCount;
  mOriginCount = aOther.mOriginCount;
  mRepeatCount = aOther.mRepeatCount;
  mPositionXCount = aOther.mPositionXCount;
  mPositionYCount = aOther.mPositionYCount;
  mImageCount = aOther.mImageCount;
  mSizeCount = aOther.mSizeCount;
  mMaskModeCount = aOther.mMaskModeCount;
  mBlendModeCount = aOther.mBlendModeCount;
  mCompositeCount = aOther.mCompositeCount;
  mLayers = Move(aOther.mLayers);

  uint32_t count = mLayers.Length();
  if (count != aOther.mLayers.Length()) {
    NS_WARNING("truncating counts due to out-of-memory");
    mAttachmentCount = std::max(mAttachmentCount, count);
    mClipCount = std::max(mClipCount, count);
    mOriginCount = std::max(mOriginCount, count);
    mRepeatCount = std::max(mRepeatCount, count);
    mPositionXCount = std::max(mPositionXCount, count);
    mPositionYCount = std::max(mPositionYCount, count);
    mImageCount = std::max(mImageCount, count);
    mSizeCount = std::max(mSizeCount, count);
    mMaskModeCount = std::max(mMaskModeCount, count);
    mBlendModeCount = std::max(mBlendModeCount, count);
    mCompositeCount = std::max(mCompositeCount, count);
  }

  return *this;
}

bool nsStyleImageLayers::operator==(const nsStyleImageLayers& aOther) const {
  if (mAttachmentCount != aOther.mAttachmentCount ||
      mClipCount != aOther.mClipCount || mOriginCount != aOther.mOriginCount ||
      mRepeatCount != aOther.mRepeatCount ||
      mPositionXCount != aOther.mPositionXCount ||
      mPositionYCount != aOther.mPositionYCount ||
      mImageCount != aOther.mImageCount || mSizeCount != aOther.mSizeCount ||
      mMaskModeCount != aOther.mMaskModeCount ||
      mBlendModeCount != aOther.mBlendModeCount) {
    return false;
  }

  if (mLayers.Length() != aOther.mLayers.Length()) {
    return false;
  }

  for (uint32_t i = 0; i < mLayers.Length(); i++) {
    if (mLayers[i].mPosition != aOther.mLayers[i].mPosition ||
        !DefinitelyEqualURIs(mLayers[i].mImage.GetURLValue(),
                             aOther.mLayers[i].mImage.GetURLValue()) ||
        mLayers[i].mImage != aOther.mLayers[i].mImage ||
        mLayers[i].mSize != aOther.mLayers[i].mSize ||
        mLayers[i].mClip != aOther.mLayers[i].mClip ||
        mLayers[i].mOrigin != aOther.mLayers[i].mOrigin ||
        mLayers[i].mAttachment != aOther.mLayers[i].mAttachment ||
        mLayers[i].mBlendMode != aOther.mLayers[i].mBlendMode ||
        mLayers[i].mComposite != aOther.mLayers[i].mComposite ||
        mLayers[i].mMaskMode != aOther.mLayers[i].mMaskMode ||
        mLayers[i].mRepeat != aOther.mLayers[i].mRepeat) {
      return false;
    }
  }

  return true;
}

bool nsStyleImageLayers::IsInitialPositionForLayerType(Position aPosition,
                                                       LayerType aType) {
  if (aPosition.mXPosition.mPercent == 0.0f &&
      aPosition.mXPosition.mLength == 0 && aPosition.mXPosition.mHasPercent &&
      aPosition.mYPosition.mPercent == 0.0f &&
      aPosition.mYPosition.mLength == 0 && aPosition.mYPosition.mHasPercent) {
    return true;
  }

  return false;
}

void Position::SetInitialPercentValues(float aPercentVal) {
  mXPosition.mPercent = aPercentVal;
  mXPosition.mLength = 0;
  mXPosition.mHasPercent = true;
  mYPosition.mPercent = aPercentVal;
  mYPosition.mLength = 0;
  mYPosition.mHasPercent = true;
}

void Position::SetInitialZeroValues() {
  mXPosition.mPercent = 0;
  mXPosition.mLength = 0;
  mXPosition.mHasPercent = false;
  mYPosition.mPercent = 0;
  mYPosition.mLength = 0;
  mYPosition.mHasPercent = false;
}

bool nsStyleImageLayers::Size::DependsOnPositioningAreaSize(
    const nsStyleImage& aImage) const {
  MOZ_ASSERT(aImage.GetType() != eStyleImageType_Null,
             "caller should have handled this");

  // If either dimension contains a non-zero percentage, rendering for that
  // dimension straightforwardly depends on frame size.
  if ((mWidthType == eLengthPercentage && mWidth.mPercent != 0.0f) ||
      (mHeightType == eLengthPercentage && mHeight.mPercent != 0.0f)) {
    return true;
  }

  // So too for contain and cover.
  if (mWidthType == eContain || mWidthType == eCover) {
    return true;
  }

  // If both dimensions are fixed lengths, there's no dependency.
  if (mWidthType == eLengthPercentage && mHeightType == eLengthPercentage) {
    return false;
  }

  MOZ_ASSERT((mWidthType == eLengthPercentage && mHeightType == eAuto) ||
                 (mWidthType == eAuto && mHeightType == eLengthPercentage) ||
                 (mWidthType == eAuto && mHeightType == eAuto),
             "logic error");

  nsStyleImageType type = aImage.GetType();

  // Gradient rendering depends on frame size when auto is involved because
  // gradients have no intrinsic ratio or dimensions, and therefore the relevant
  // dimension is "treat[ed] as 100%".
  if (type == eStyleImageType_Gradient) {
    return true;
  }

  // XXX Element rendering for auto or fixed length doesn't depend on frame size
  //     according to the spec.  However, we don't implement the spec yet, so
  //     for now we bail and say element() plus auto affects ultimate size.
  if (type == eStyleImageType_Element) {
    return true;
  }

  if (type == eStyleImageType_Image) {
    nsCOMPtr<imgIContainer> imgContainer;
    if (imgRequestProxy* req = aImage.GetImageData()) {
      req->GetImage(getter_AddRefs(imgContainer));
    }
    if (imgContainer) {
      CSSIntSize imageSize;
      nsSize imageRatio;
      bool hasWidth, hasHeight;
      nsLayoutUtils::ComputeSizeForDrawing(imgContainer, imageSize, imageRatio,
                                           hasWidth, hasHeight);

      // If the image has a fixed width and height, rendering never depends on
      // the frame size.
      if (hasWidth && hasHeight) {
        return false;
      }

      // If the image has an intrinsic ratio, rendering will depend on frame
      // size when background-size is all auto.
      if (imageRatio != nsSize(0, 0)) {
        return mWidthType == mHeightType;
      }

      // Otherwise, rendering depends on frame size when the image dimensions
      // and background-size don't complement each other.
      return !(hasWidth && mHeightType == eLengthPercentage) &&
             !(hasHeight && mWidthType == eLengthPercentage);
    }
  } else {
    NS_NOTREACHED("missed an enum value");
  }

  // Passed the gauntlet: no dependency.
  return false;
}

void nsStyleImageLayers::Size::SetInitialValues() {
  mWidthType = mHeightType = eAuto;
}

bool nsStyleImageLayers::Size::operator==(const Size& aOther) const {
  MOZ_ASSERT(mWidthType < eDimensionType_COUNT, "bad mWidthType for this");
  MOZ_ASSERT(mHeightType < eDimensionType_COUNT, "bad mHeightType for this");
  MOZ_ASSERT(aOther.mWidthType < eDimensionType_COUNT,
             "bad mWidthType for aOther");
  MOZ_ASSERT(aOther.mHeightType < eDimensionType_COUNT,
             "bad mHeightType for aOther");

  return mWidthType == aOther.mWidthType && mHeightType == aOther.mHeightType &&
         (mWidthType != eLengthPercentage || mWidth == aOther.mWidth) &&
         (mHeightType != eLengthPercentage || mHeight == aOther.mHeight);
}

nsStyleImageLayers::Layer::Layer()
    : mClip(StyleGeometryBox::BorderBox),
      mAttachment(NS_STYLE_IMAGELAYER_ATTACHMENT_SCROLL),
      mBlendMode(NS_STYLE_BLEND_NORMAL),
      mComposite(NS_STYLE_MASK_COMPOSITE_ADD),
      mMaskMode(NS_STYLE_MASK_MODE_MATCH_SOURCE) {
  mImage.SetNull();
  mSize.SetInitialValues();
}

nsStyleImageLayers::Layer::~Layer() {}

void nsStyleImageLayers::Layer::Initialize(
    nsStyleImageLayers::LayerType aType) {
  mRepeat.SetInitialValues();

  mPosition.SetInitialPercentValues(0.0f);

  if (aType == LayerType::Background) {
    mOrigin = StyleGeometryBox::PaddingBox;
  } else {
    MOZ_ASSERT(aType == LayerType::Mask, "unsupported layer type.");
    mOrigin = StyleGeometryBox::BorderBox;
  }
}

bool nsStyleImageLayers::Layer::
    RenderingMightDependOnPositioningAreaSizeChange() const {
  // Do we even have an image?
  if (mImage.IsEmpty()) {
    return false;
  }

  return mPosition.DependsOnPositioningAreaSize() ||
         mSize.DependsOnPositioningAreaSize(mImage) ||
         mRepeat.DependsOnPositioningAreaSize();
}

bool nsStyleImageLayers::Layer::operator==(const Layer& aOther) const {
  return mAttachment == aOther.mAttachment && mClip == aOther.mClip &&
         mOrigin == aOther.mOrigin && mRepeat == aOther.mRepeat &&
         mBlendMode == aOther.mBlendMode && mPosition == aOther.mPosition &&
         mSize == aOther.mSize && mImage == aOther.mImage &&
         mMaskMode == aOther.mMaskMode && mComposite == aOther.mComposite;
}

template <class ComputedValueItem>
static void FillImageLayerList(
    nsStyleAutoArray<nsStyleImageLayers::Layer>& aLayers,
    ComputedValueItem nsStyleImageLayers::Layer::*aResultLocation,
    uint32_t aItemCount, uint32_t aFillCount) {
  NS_PRECONDITION(aFillCount <= aLayers.Length(), "unexpected array length");
  for (uint32_t sourceLayer = 0, destLayer = aItemCount; destLayer < aFillCount;
       ++sourceLayer, ++destLayer) {
    aLayers[destLayer].*aResultLocation = aLayers[sourceLayer].*aResultLocation;
  }
}

// The same as FillImageLayerList, but for values stored in
// layer.mPosition.*aResultLocation instead of layer.*aResultLocation.
static void FillImageLayerPositionCoordList(
    nsStyleAutoArray<nsStyleImageLayers::Layer>& aLayers,
    Position::Coord Position::*aResultLocation, uint32_t aItemCount,
    uint32_t aFillCount) {
  NS_PRECONDITION(aFillCount <= aLayers.Length(), "unexpected array length");
  for (uint32_t sourceLayer = 0, destLayer = aItemCount; destLayer < aFillCount;
       ++sourceLayer, ++destLayer) {
    aLayers[destLayer].mPosition.*aResultLocation =
        aLayers[sourceLayer].mPosition.*aResultLocation;
  }
}

void nsStyleImageLayers::FillAllLayers(uint32_t aMaxItemCount) {
  // Delete any extra items.  We need to keep layers in which any
  // property was specified.
  mLayers.TruncateLengthNonZero(aMaxItemCount);

  uint32_t fillCount = mImageCount;
  FillImageLayerList(mLayers, &Layer::mImage, mImageCount, fillCount);
  FillImageLayerList(mLayers, &Layer::mRepeat, mRepeatCount, fillCount);
  FillImageLayerList(mLayers, &Layer::mAttachment, mAttachmentCount, fillCount);
  FillImageLayerList(mLayers, &Layer::mClip, mClipCount, fillCount);
  FillImageLayerList(mLayers, &Layer::mBlendMode, mBlendModeCount, fillCount);
  FillImageLayerList(mLayers, &Layer::mOrigin, mOriginCount, fillCount);
  FillImageLayerPositionCoordList(mLayers, &Position::mXPosition,
                                  mPositionXCount, fillCount);
  FillImageLayerPositionCoordList(mLayers, &Position::mYPosition,
                                  mPositionYCount, fillCount);
  FillImageLayerList(mLayers, &Layer::mSize, mSizeCount, fillCount);
  FillImageLayerList(mLayers, &Layer::mMaskMode, mMaskModeCount, fillCount);
  FillImageLayerList(mLayers, &Layer::mComposite, mCompositeCount, fillCount);
}

nsChangeHint nsStyleImageLayers::Layer::CalcDifference(
    const nsStyleImageLayers::Layer& aNewLayer) const {
  nsChangeHint hint = nsChangeHint(0);
  if (!DefinitelyEqualURIs(mImage.GetURLValue(),
                           aNewLayer.mImage.GetURLValue())) {
    hint |= nsChangeHint_RepaintFrame | nsChangeHint_UpdateEffects;

    // If mImage links to an SVG mask, the URL in mImage must have a fragment.
    // Not vice versa.
    // Here are examples of URI contains a fragment, two of them link to an
    // SVG mask:
    //   mask:url(a.svg#maskID); // The fragment of this URI is an ID of a mask
    //                           // element in a.svg.
    //   mask:url(#localMaskID); // The fragment of this URI is an ID of a mask
    //                           // element in local document.
    //   mask:url(b.svg#viewBoxID); // The fragment of this URI is an ID of a