The Tor Browser: layout/style/nsStyleStruct.cpp@97036ab72558 (annotated)

layout/style/nsStyleStruct.cpp@97036ab72558 (annotated)

layout/style/nsStyleStruct.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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 "nsIWidget.h"
 #include "nsCRTGlue.h"
 #include "nsCSSProps.h"
 #include "nsCOMPtr.h"
 #include "nsBidiUtils.h"
 #include "nsLayoutUtils.h"
 #include "imgIRequest.h"
 #include "imgIContainer.h"
 #include "mozilla/Likely.h"
 #include "nsIURI.h"
 #include "nsIDocument.h"
 #include <algorithm>
 static_assert((((1 << nsStyleStructID_Length) - 1) &
                ~(NS_STYLE_INHERIT_MASK)) == 0,
               "Not enough bits in NS_STYLE_INHERIT_MASK");
 inline bool IsFixedUnit(const nsStyleCoord& aCoord, bool aEnumOK)
 {
   return aCoord.ConvertsToLength() ||
          (aEnumOK && aCoord.GetUnit() == eStyleUnit_Enumerated);
 }
 static bool EqualURIs(nsIURI *aURI1, nsIURI *aURI2)
 {
   bool eq;
   return aURI1 == aURI2 ||    // handle null==null, and optimize
          (aURI1 && aURI2 &&
           NS_SUCCEEDED(aURI1->Equals(aURI2, &eq)) && // not equal on fail
           eq);
 }
 static bool EqualURIs(mozilla::css::URLValue *aURI1, mozilla::css::URLValue *aURI2)
 {
   return aURI1 == aURI2 ||    // handle null==null, and optimize
          (aURI1 && aURI2 && aURI1->URIEquals(*aURI2));
 }
 static bool EqualImages(imgIRequest *aImage1, imgIRequest* aImage2)
 {
   if (aImage1 == aImage2) {
     return true;
   }
   if (!aImage1 || !aImage2) {
     return false;
   }
   nsCOMPtr<nsIURI> uri1, uri2;
   aImage1->GetURI(getter_AddRefs(uri1));
   aImage2->GetURI(getter_AddRefs(uri2));
   return EqualURIs(uri1, uri2);
 }
 // 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 nsChangeHint CalcShadowDifference(nsCSSShadowArray* lhs,
                                          nsCSSShadowArray* rhs);
 // --------------------
 // nsStyleFont
 //
 nsStyleFont::nsStyleFont(const nsFont& aFont, nsPresContext *aPresContext)
   : mFont(aFont)
   , mGenericID(kGenericFont_NONE)
   , mExplicitLanguage(false)
 {
   MOZ_COUNT_CTOR(nsStyleFont);
   Init(aPresContext);
 }
 nsStyleFont::nsStyleFont(const nsStyleFont& aSrc)
   : mFont(aSrc.mFont)
   , mSize(aSrc.mSize)
   , mGenericID(aSrc.mGenericID)
   , mScriptLevel(aSrc.mScriptLevel)
   , mMathVariant(aSrc.mMathVariant)
   , mMathDisplay(aSrc.mMathDisplay)
   , mExplicitLanguage(aSrc.mExplicitLanguage)
   , mAllowZoom(aSrc.mAllowZoom)
   , mScriptUnconstrainedSize(aSrc.mScriptUnconstrainedSize)
   , mScriptMinSize(aSrc.mScriptMinSize)
   , mScriptSizeMultiplier(aSrc.mScriptSizeMultiplier)
   , mLanguage(aSrc.mLanguage)
 {
   MOZ_COUNT_CTOR(nsStyleFont);
 }
 nsStyleFont::nsStyleFont(nsPresContext* aPresContext)
   // passing nullptr to GetDefaultFont make it use the doc language
   : mFont(*(aPresContext->GetDefaultFont(kPresContext_DefaultVariableFont_ID,
                                          nullptr)))
   , mGenericID(kGenericFont_NONE)
   , mExplicitLanguage(false)
 {
   MOZ_COUNT_CTOR(nsStyleFont);
   Init(aPresContext);
 }
 void
 nsStyleFont::Init(nsPresContext* aPresContext)
 {
   mSize = mFont.size = nsStyleFont::ZoomText(aPresContext, mFont.size);
   mScriptUnconstrainedSize = mSize;
   mScriptMinSize = aPresContext->CSSTwipsToAppUnits(
       NS_POINTS_TO_TWIPS(NS_MATHML_DEFAULT_SCRIPT_MIN_SIZE_PT));
   mScriptLevel = 0;
   mScriptSizeMultiplier = NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER;
   mMathVariant = NS_MATHML_MATHVARIANT_NONE;
   mMathDisplay = NS_MATHML_DISPLAYSTYLE_INLINE;
   mAllowZoom = true;
   nsAutoString language;
   aPresContext->Document()->GetContentLanguage(language);
   language.StripWhitespace();
   // Content-Language may be a comma-separated list of language codes,
   // in which case the HTML5 spec says to treat it as unknown
   if (!language.IsEmpty() &&
       language.FindChar(char16_t(',')) == kNotFound) {
     mLanguage = do_GetAtom(language);
     // NOTE:  This does *not* count as an explicit language; in other
     // words, it doesn't trigger language-specific hyphenation.
   } else {
     // we didn't find a (usable) Content-Language, so we fall back
     // to whatever the presContext guessed from the charset
     mLanguage = aPresContext->GetLanguageFromCharset();
   }
 }
 void*
 nsStyleFont::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
   void* result = aContext->AllocateFromShell(sz);
   if (result)
     memset(result, 0, sz);
   return result;
 }
 void
 nsStyleFont::Destroy(nsPresContext* aContext) {
   this->~nsStyleFont();
   aContext->FreeToShell(sizeof(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& aOther) const
 {
   MOZ_ASSERT(mAllowZoom == aOther.mAllowZoom,
              "expected mAllowZoom to be the same on both nsStyleFonts");
   if (mSize != aOther.mSize ||
       mLanguage != aOther.mLanguage ||
       mExplicitLanguage != aOther.mExplicitLanguage ||
       mMathVariant != aOther.mMathVariant ||
       mMathDisplay != aOther.mMathDisplay) {
     return NS_STYLE_HINT_REFLOW;
   }
   return CalcFontDifference(mFont, aOther.mFont);
 }
 /* static */ nscoord
 nsStyleFont::ZoomText(nsPresContext *aPresContext, nscoord aSize)
 {
   return nscoord(float(aSize) * aPresContext->TextZoom());
 }
 /* static */ nscoord
 nsStyleFont::UnZoomText(nsPresContext *aPresContext, nscoord aSize)
 {
   return nscoord(float(aSize) / aPresContext->TextZoom());
 }
 nsChangeHint nsStyleFont::CalcFontDifference(const nsFont& aFont1, const nsFont& aFont2)
 {
   if ((aFont1.size == aFont2.size) &&
       (aFont1.sizeAdjust == aFont2.sizeAdjust) &&
       (aFont1.style == aFont2.style) &&
       (aFont1.variant == aFont2.variant) &&
       (aFont1.weight == aFont2.weight) &&
       (aFont1.stretch == aFont2.stretch) &&
       (aFont1.smoothing == aFont2.smoothing) &&
       (aFont1.name == aFont2.name) &&
       (aFont1.kerning == aFont2.kerning) &&
       (aFont1.synthesis == aFont2.synthesis) &&
       (aFont1.variantAlternates == aFont2.variantAlternates) &&
       (aFont1.alternateValues == aFont2.alternateValues) &&
       (aFont1.featureValueLookup == aFont2.featureValueLookup) &&
       (aFont1.variantCaps == aFont2.variantCaps) &&
       (aFont1.variantEastAsian == aFont2.variantEastAsian) &&
       (aFont1.variantLigatures == aFont2.variantLigatures) &&
       (aFont1.variantNumeric == aFont2.variantNumeric) &&
       (aFont1.variantPosition == aFont2.variantPosition) &&
       (aFont1.fontFeatureSettings == aFont2.fontFeatureSettings) &&
       (aFont1.languageOverride == aFont2.languageOverride) &&
       (aFont1.systemFont == aFont2.systemFont)) {
     if ((aFont1.decorations == aFont2.decorations)) {
       return NS_STYLE_HINT_NONE;
     }
     return NS_STYLE_HINT_VISUAL;
   }
   return NS_STYLE_HINT_REFLOW;
 }
 static bool IsFixedData(const nsStyleSides& aSides, bool aEnumOK)
 {
   NS_FOR_CSS_SIDES(side) {
     if (!IsFixedUnit(aSides.Get(side), aEnumOK))
       return false;
   }
   return true;
 }
 static nscoord CalcCoord(const nsStyleCoord& aCoord,
                          const nscoord* aEnumTable,
                          int32_t aNumEnums)
 {
   if (aCoord.GetUnit() == eStyleUnit_Enumerated) {
     NS_ABORT_IF_FALSE(aEnumTable, "must have enum table");
     int32_t value = aCoord.GetIntValue();
     if (0 <= value && value < aNumEnums) {
       return aEnumTable[aCoord.GetIntValue()];
     }
     NS_NOTREACHED("unexpected enum value");
     return 0;
   }
   NS_ABORT_IF_FALSE(aCoord.ConvertsToLength(), "unexpected unit");
   return nsRuleNode::ComputeCoordPercentCalc(aCoord, 0);
 }
 nsStyleMargin::nsStyleMargin() {
   MOZ_COUNT_CTOR(nsStyleMargin);
   nsStyleCoord zero(0, nsStyleCoord::CoordConstructor);
   NS_FOR_CSS_SIDES(side) {
     mMargin.Set(side, zero);
   }
   mHasCachedMargin = false;
 }
 nsStyleMargin::nsStyleMargin(const nsStyleMargin& aSrc) {
   MOZ_COUNT_CTOR(nsStyleMargin);
   mMargin = aSrc.mMargin;
   mHasCachedMargin = false;
 }
 void*
 nsStyleMargin::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
   void* result = aContext->AllocateFromShell(sz);
   if (result)
     memset(result, 0, sz);
   return result;
 }
 void
 nsStyleMargin::Destroy(nsPresContext* aContext) {
   this->~nsStyleMargin();
   aContext->FreeToShell(sizeof(nsStyleMargin), this);
 }
 void nsStyleMargin::RecalcData()
 {
   if (IsFixedData(mMargin, false)) {
     NS_FOR_CSS_SIDES(side) {
       mCachedMargin.Side(side) = CalcCoord(mMargin.Get(side), nullptr, 0);
     }
     mHasCachedMargin = true;
   }
   else
     mHasCachedMargin = false;
 }
 nsChangeHint nsStyleMargin::CalcDifference(const nsStyleMargin& aOther) const
 {
   if (mMargin == aOther.mMargin) {
     return NS_STYLE_HINT_NONE;
   }
   // Margin differences can't affect descendant intrinsic sizes and
   // don't need to force children to reflow.
   return NS_CombineHint(nsChangeHint_NeedReflow,
                         nsChangeHint_ClearAncestorIntrinsics);
 }
 nsStylePadding::nsStylePadding() {
   MOZ_COUNT_CTOR(nsStylePadding);
   nsStyleCoord zero(0, nsStyleCoord::CoordConstructor);
   NS_FOR_CSS_SIDES(side) {
     mPadding.Set(side, zero);
   }
   mHasCachedPadding = false;
 }
 nsStylePadding::nsStylePadding(const nsStylePadding& aSrc) {
   MOZ_COUNT_CTOR(nsStylePadding);
   mPadding = aSrc.mPadding;
   mHasCachedPadding = false;
 }
 void*
 nsStylePadding::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
   void* result = aContext->AllocateFromShell(sz);
   if (result)
     memset(result, 0, sz);
   return result;
 }
 void
 nsStylePadding::Destroy(nsPresContext* aContext) {
   this->~nsStylePadding();
   aContext->FreeToShell(sizeof(nsStylePadding), this);
 }
 void nsStylePadding::RecalcData()
 {
   if (IsFixedData(mPadding, false)) {
     NS_FOR_CSS_SIDES(side) {
       // Clamp negative calc() to 0.
       mCachedPadding.Side(side) =
         std::max(CalcCoord(mPadding.Get(side), nullptr, 0), 0);
     }
     mHasCachedPadding = true;
   }
   else
     mHasCachedPadding = false;
 }
 nsChangeHint nsStylePadding::CalcDifference(const nsStylePadding& aOther) const
 {
   if (mPadding == aOther.mPadding) {
     return NS_STYLE_HINT_NONE;
   }
   // 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.
   return NS_SubtractHint(NS_STYLE_HINT_REFLOW,
                          nsChangeHint_ClearDescendantIntrinsics);
 }
 nsStyleBorder::nsStyleBorder(nsPresContext* aPresContext)
   : mBorderColors(nullptr),
     mBoxShadow(nullptr),
     mBorderImageFill(NS_STYLE_BORDER_IMAGE_SLICE_NOFILL),
     mBorderImageRepeatH(NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH),
     mBorderImageRepeatV(NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH),
     mFloatEdge(NS_STYLE_FLOAT_EDGE_CONTENT),
     mComputedBorder(0, 0, 0, 0)
 {
   MOZ_COUNT_CTOR(nsStyleBorder);
   NS_FOR_CSS_HALF_CORNERS (corner) {
     mBorderRadius.Set(corner, nsStyleCoord(0, nsStyleCoord::CoordConstructor));
   }
   nscoord medium =
     (aPresContext->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 | BORDER_COLOR_FOREGROUND;
     mBorderColor[side] = NS_RGB(0, 0, 0);
   }
   mTwipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
 }
 nsBorderColors::~nsBorderColors()
 {
   NS_CSS_DELETE_LIST_MEMBER(nsBorderColors, this, mNext);
 }
 nsBorderColors*
 nsBorderColors::Clone(bool aDeep) const
 {
   nsBorderColors* result = new nsBorderColors(mColor);
   if (MOZ_UNLIKELY(!result))
     return result;
   if (aDeep)
     NS_CSS_CLONE_LIST_MEMBER(nsBorderColors, this, mNext, result, (false));
   return result;
 }
 nsStyleBorder::nsStyleBorder(const nsStyleBorder& aSrc)
   : mBorderColors(nullptr),
     mBoxShadow(aSrc.mBoxShadow),
     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),
     mComputedBorder(aSrc.mComputedBorder),
     mBorder(aSrc.mBorder),
     mTwipsPerPixel(aSrc.mTwipsPerPixel)
 {
   MOZ_COUNT_CTOR(nsStyleBorder);
   if (aSrc.mBorderColors) {
     EnsureBorderColors();
     for (int32_t i = 0; i < 4; i++)
       if (aSrc.mBorderColors[i])
         mBorderColors[i] = aSrc.mBorderColors[i]->Clone();
       else
         mBorderColors[i] = nullptr;
   }
   NS_FOR_CSS_SIDES(side) {
     mBorderStyle[side] = aSrc.mBorderStyle[side];
     mBorderColor[side] = aSrc.mBorderColor[side];
   }
 }
 nsStyleBorder::~nsStyleBorder()
 {
   MOZ_COUNT_DTOR(nsStyleBorder);
   if (mBorderColors) {
     for (int32_t i = 0; i < 4; i++)
       delete mBorderColors[i];
     delete [] mBorderColors;
   }
 }
 void*
 nsStyleBorder::operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
   void* result = aContext->AllocateFromShell(sz);
   if (result)
     memset(result, 0, sz);
   return result;
 }
 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) {
   UntrackImage(aContext);
   this->~nsStyleBorder();
   aContext->FreeToShell(sizeof(nsStyleBorder), this);
 }
 nsChangeHint nsStyleBorder::CalcDifference(const nsStyleBorder& aOther) const
 {
   nsChangeHint shadowDifference =
     CalcShadowDifference(mBoxShadow, aOther.mBoxShadow);
   NS_ABORT_IF_FALSE(shadowDifference == unsigned(NS_STYLE_HINT_REFLOW) ||
                     shadowDifference == unsigned(NS_STYLE_HINT_VISUAL) ||
                     shadowDifference == unsigned(NS_STYLE_HINT_NONE),
                     "should do more with shadowDifference");
   // Note that differences in mBorder don't affect rendering (which should only
   // use mComputedBorder), so don't need to be tested for here.
   // XXXbz we should be able to return a more specific change hint for
   // at least GetComputedBorder() differences...
   if (mTwipsPerPixel != aOther.mTwipsPerPixel ||
       GetComputedBorder() != aOther.GetComputedBorder() ||
       mFloatEdge != aOther.mFloatEdge ||
       mBorderImageOutset != aOther.mBorderImageOutset ||
       (shadowDifference & nsChangeHint_NeedReflow))
     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 visual hint for some other change rather than bother
     // tracking this result through the rest of the function.
     if (HasVisibleStyle(ix) != aOther.HasVisibleStyle(ix)) {
       return NS_CombineHint(NS_STYLE_HINT_VISUAL,
                             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 VISUAL 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] != aOther.mBorderStyle[ix] ||
         mBorderColor[ix] != aOther.mBorderColor[ix])
       return NS_STYLE_HINT_VISUAL;
   }
   if (mBorderRadius != aOther.mBorderRadius ||
       !mBorderColors != !aOther.mBorderColors)
     return NS_STYLE_HINT_VISUAL;
   if (IsBorderImageLoaded() || aOther.IsBorderImageLoaded()) {
     if (mBorderImageSource  != aOther.mBorderImageSource  ||
         mBorderImageRepeatH != aOther.mBorderImageRepeatH ||
         mBorderImageRepeatV != aOther.mBorderImageRepeatV ||
         mBorderImageSlice   != aOther.mBorderImageSlice   ||
         mBorderImageFill    != aOther.mBorderImageFill    ||
         mBorderImageWidth   != aOther.mBorderImageWidth   ||
         mBorderImageOutset  != aOther.mBorderImageOutset)
       return NS_STYLE_HINT_VISUAL;
   }
   // Note that at this point if mBorderColors is non-null so is
   // aOther.mBorderColors
   if (mBorderColors) {
     NS_FOR_CSS_SIDES(ix) {
       if (!nsBorderColors::Equal(mBorderColors[ix],
                                  aOther.mBorderColors[ix]))
         return NS_STYLE_HINT_VISUAL;
     }
   }
   return shadowDifference;
 }
 nsStyleOutline::nsStyleOutline(nsPresContext* aPresContext)
 {
   MOZ_COUNT_CTOR(nsStyleOutline);
   // spacing values not inherited
   nsStyleCoord zero(0, nsStyleCoord::CoordConstructor);
   NS_FOR_CSS_HALF_CORNERS(corner) {
     mOutlineRadius.Set(corner, zero);
   }
   mOutlineOffset = 0;
   mOutlineWidth = nsStyleCoord(NS_STYLE_BORDER_WIDTH_MEDIUM, eStyleUnit_Enumerated);
   mOutlineStyle = NS_STYLE_BORDER_STYLE_NONE;
   mOutlineColor = NS_RGB(0, 0, 0);
   mHasCachedOutline = false;
   mTwipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
 }
 nsStyleOutline::nsStyleOutline(const nsStyleOutline& aSrc) {
   MOZ_COUNT_CTOR(nsStyleOutline);
   memcpy((nsStyleOutline*)this, &aSrc, sizeof(nsStyleOutline));
 }
 void
 nsStyleOutline::RecalcData(nsPresContext* aContext)
 {
   if (NS_STYLE_BORDER_STYLE_NONE == GetOutlineStyle()) {
     mCachedOutlineWidth = 0;
     mHasCachedOutline = true;
   } else if (IsFixedUnit(mOutlineWidth, true)) {
     // Clamp negative calc() to 0.
     mCachedOutlineWidth =
       std::max(CalcCoord(mOutlineWidth, aContext->GetBorderWidthTable(), 3), 0);
     mCachedOutlineWidth =
       NS_ROUND_BORDER_TO_PIXELS(mCachedOutlineWidth, mTwipsPerPixel);
     mHasCachedOutline = true;
   }
   else
     mHasCachedOutline = false;
 }
 nsChangeHint nsStyleOutline::CalcDifference(const nsStyleOutline& aOther) const
 {
   bool outlineWasVisible =
     mCachedOutlineWidth > 0 && mOutlineStyle != NS_STYLE_BORDER_STYLE_NONE;
   bool outlineIsVisible =
     aOther.mCachedOutlineWidth > 0 && aOther.mOutlineStyle != NS_STYLE_BORDER_STYLE_NONE;
   if (outlineWasVisible != outlineIsVisible ||
       (outlineIsVisible && (mOutlineOffset != aOther.mOutlineOffset ||
                             mOutlineWidth != aOther.mOutlineWidth ||
                             mTwipsPerPixel != aOther.mTwipsPerPixel))) {
     return NS_CombineHint(nsChangeHint_AllReflowHints,
                           nsChangeHint_RepaintFrame);
   }
   if ((mOutlineStyle != aOther.mOutlineStyle) ||
       (mOutlineColor != aOther.mOutlineColor) ||
       (mOutlineRadius != aOther.mOutlineRadius)) {
     return nsChangeHint_RepaintFrame;
   }
   return NS_STYLE_HINT_NONE;
 }
 // --------------------
 // nsStyleList
 //
 nsStyleList::nsStyleList()
   : mListStyleType(NS_STYLE_LIST_STYLE_DISC),
     mListStylePosition(NS_STYLE_LIST_STYLE_POSITION_OUTSIDE)
 {
   MOZ_COUNT_CTOR(nsStyleList);
 }
 nsStyleList::~nsStyleList()
 {
   MOZ_COUNT_DTOR(nsStyleList);
 }
 nsStyleList::nsStyleList(const nsStyleList& aSource)
   : mListStyleType(aSource.mListStyleType),
     mListStylePosition(aSource.mListStylePosition),
     mImageRegion(aSource.mImageRegion)
 {
   SetListStyleImage(aSource.GetListStyleImage());
   MOZ_COUNT_CTOR(nsStyleList);
 }
 nsChangeHint nsStyleList::CalcDifference(const nsStyleList& aOther) const
 {
   if (mListStylePosition != aOther.mListStylePosition)
     return NS_STYLE_HINT_FRAMECHANGE;
   if (EqualImages(mListStyleImage, aOther.mListStyleImage) &&
       mListStyleType == aOther.mListStyleType) {
     if (mImageRegion.IsEqualInterior(aOther.mImageRegion))
       return NS_STYLE_HINT_NONE;
     if (mImageRegion.width == aOther.mImageRegion.width &&
         mImageRegion.height == aOther.mImageRegion.height)
       return NS_STYLE_HINT_VISUAL;
   }
   return NS_STYLE_HINT_REFLOW;
 }
 // --------------------
 // nsStyleXUL
 //
 nsStyleXUL::nsStyleXUL()
 {
   MOZ_COUNT_CTOR(nsStyleXUL);
   mBoxAlign  = NS_STYLE_BOX_ALIGN_STRETCH;
   mBoxDirection = NS_STYLE_BOX_DIRECTION_NORMAL;
   mBoxFlex = 0.0f;
   mBoxOrient = NS_STYLE_BOX_ORIENT_HORIZONTAL;
   mBoxPack   = NS_STYLE_BOX_PACK_START;
   mBoxOrdinal = 1;
   mStretchStack = true;
 }
 nsStyleXUL::~nsStyleXUL()
 {
   MOZ_COUNT_DTOR(nsStyleXUL);
 }
 nsStyleXUL::nsStyleXUL(const nsStyleXUL& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleXUL);
   memcpy((nsStyleXUL*)this, &aSource, sizeof(nsStyleXUL));
 }
 nsChangeHint nsStyleXUL::CalcDifference(const nsStyleXUL& aOther) const
 {
   if (mBoxAlign == aOther.mBoxAlign &&
       mBoxDirection == aOther.mBoxDirection &&
       mBoxFlex == aOther.mBoxFlex &&
       mBoxOrient == aOther.mBoxOrient &&
       mBoxPack == aOther.mBoxPack &&
       mBoxOrdinal == aOther.mBoxOrdinal &&
       mStretchStack == aOther.mStretchStack)
     return NS_STYLE_HINT_NONE;
   if (mBoxOrdinal != aOther.mBoxOrdinal)
     return NS_STYLE_HINT_FRAMECHANGE;
   return NS_STYLE_HINT_REFLOW;
 }
 // --------------------
 // nsStyleColumn
 //
 /* static */ const uint32_t nsStyleColumn::kMaxColumnCount = 1000;
 nsStyleColumn::nsStyleColumn(nsPresContext* aPresContext)
 {
   MOZ_COUNT_CTOR(nsStyleColumn);
   mColumnCount = NS_STYLE_COLUMN_COUNT_AUTO;
   mColumnWidth.SetAutoValue();
   mColumnGap.SetNormalValue();
   mColumnFill = NS_STYLE_COLUMN_FILL_BALANCE;
   mColumnRuleWidth = (aPresContext->GetBorderWidthTable())[NS_STYLE_BORDER_WIDTH_MEDIUM];
   mColumnRuleStyle = NS_STYLE_BORDER_STYLE_NONE;
   mColumnRuleColor = NS_RGB(0, 0, 0);
   mColumnRuleColorIsForeground = true;
   mTwipsPerPixel = aPresContext->AppUnitsPerDevPixel();
 }
 nsStyleColumn::~nsStyleColumn()
 {
   MOZ_COUNT_DTOR(nsStyleColumn);
 }
 nsStyleColumn::nsStyleColumn(const nsStyleColumn& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleColumn);
   memcpy((nsStyleColumn*)this, &aSource, sizeof(nsStyleColumn));
 }
 nsChangeHint nsStyleColumn::CalcDifference(const nsStyleColumn& aOther) const
 {
   if ((mColumnWidth.GetUnit() == eStyleUnit_Auto)
       != (aOther.mColumnWidth.GetUnit() == eStyleUnit_Auto) ||
       mColumnCount != aOther.mColumnCount)
     // 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 NS_STYLE_HINT_FRAMECHANGE;
   if (mColumnWidth != aOther.mColumnWidth ||
       mColumnGap != aOther.mColumnGap ||
       mColumnFill != aOther.mColumnFill)
     return NS_STYLE_HINT_REFLOW;
   if (GetComputedColumnRuleWidth() != aOther.GetComputedColumnRuleWidth() ||
       mColumnRuleStyle != aOther.mColumnRuleStyle ||
       mColumnRuleColor != aOther.mColumnRuleColor ||
       mColumnRuleColorIsForeground != aOther.mColumnRuleColorIsForeground)
     return NS_STYLE_HINT_VISUAL;
   return NS_STYLE_HINT_NONE;
 }
 // --------------------
 // nsStyleSVG
 //
 nsStyleSVG::nsStyleSVG()
 {
     MOZ_COUNT_CTOR(nsStyleSVG);
     mFill.mType              = eStyleSVGPaintType_Color;
     mFill.mPaint.mColor      = NS_RGB(0,0,0);
     mFill.mFallbackColor     = NS_RGB(0,0,0);
     mStroke.mType            = eStyleSVGPaintType_None;
     mStroke.mPaint.mColor    = NS_RGB(0,0,0);
     mStroke.mFallbackColor   = NS_RGB(0,0,0);
     mStrokeDasharray         = nullptr;
     mStrokeDashoffset.SetCoordValue(0);
     mStrokeWidth.SetCoordValue(nsPresContext::CSSPixelsToAppUnits(1));
     mFillOpacity             = 1.0f;
     mStrokeMiterlimit        = 4.0f;
     mStrokeOpacity           = 1.0f;
     mStrokeDasharrayLength   = 0;
     mClipRule                = NS_STYLE_FILL_RULE_NONZERO;
     mColorInterpolation      = NS_STYLE_COLOR_INTERPOLATION_SRGB;
     mColorInterpolationFilters = NS_STYLE_COLOR_INTERPOLATION_LINEARRGB;
     mFillRule                = NS_STYLE_FILL_RULE_NONZERO;
     mImageRendering          = NS_STYLE_IMAGE_RENDERING_AUTO;
     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;
     mTextRendering           = NS_STYLE_TEXT_RENDERING_AUTO;
     mFillOpacitySource       = eStyleSVGOpacitySource_Normal;
     mStrokeOpacitySource     = eStyleSVGOpacitySource_Normal;
     mStrokeDasharrayFromObject = false;
     mStrokeDashoffsetFromObject = false;
     mStrokeWidthFromObject   = false;
 }
 nsStyleSVG::~nsStyleSVG()
 {
   MOZ_COUNT_DTOR(nsStyleSVG);
   delete [] mStrokeDasharray;
 }
 nsStyleSVG::nsStyleSVG(const nsStyleSVG& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleSVG);
   mFill = aSource.mFill;
   mStroke = aSource.mStroke;
   mMarkerEnd = aSource.mMarkerEnd;
   mMarkerMid = aSource.mMarkerMid;
   mMarkerStart = aSource.mMarkerStart;
   mStrokeDasharrayLength = aSource.mStrokeDasharrayLength;
   if (aSource.mStrokeDasharray) {
     mStrokeDasharray = new nsStyleCoord[mStrokeDasharrayLength];
     if (mStrokeDasharray)
       memcpy(mStrokeDasharray,
              aSource.mStrokeDasharray,
              mStrokeDasharrayLength * sizeof(nsStyleCoord));
     else
       mStrokeDasharrayLength = 0;
   } else {
     mStrokeDasharray = nullptr;
   }
   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;
   mImageRendering = aSource.mImageRendering;
   mPaintOrder = aSource.mPaintOrder;
   mShapeRendering = aSource.mShapeRendering;
   mStrokeLinecap = aSource.mStrokeLinecap;
   mStrokeLinejoin = aSource.mStrokeLinejoin;
   mTextAnchor = aSource.mTextAnchor;
   mTextRendering = aSource.mTextRendering;
   mFillOpacitySource = aSource.mFillOpacitySource;
   mStrokeOpacitySource = aSource.mStrokeOpacitySource;
   mStrokeDasharrayFromObject = aSource.mStrokeDasharrayFromObject;
   mStrokeDashoffsetFromObject = aSource.mStrokeDashoffsetFromObject;
   mStrokeWidthFromObject = aSource.mStrokeWidthFromObject;
 }
 static bool PaintURIChanged(const nsStyleSVGPaint& aPaint1,
                               const nsStyleSVGPaint& aPaint2)
 {
   if (aPaint1.mType != aPaint2.mType) {
     return aPaint1.mType == eStyleSVGPaintType_Server ||
            aPaint2.mType == eStyleSVGPaintType_Server;
   }
   return aPaint1.mType == eStyleSVGPaintType_Server &&
     !EqualURIs(aPaint1.mPaint.mPaintServer, aPaint2.mPaint.mPaintServer);
 }
 nsChangeHint nsStyleSVG::CalcDifference(const nsStyleSVG& aOther) const
 {
   nsChangeHint hint = nsChangeHint(0);
   if (!EqualURIs(mMarkerEnd, aOther.mMarkerEnd) ||
       !EqualURIs(mMarkerMid, aOther.mMarkerMid) ||
       !EqualURIs(mMarkerStart, aOther.mMarkerStart)) {
     // Markers currently contribute to nsSVGPathGeometryFrame::mRect,
     // so we need a reflow as well as a repaint. No intrinsic sizes need
     // to change, so nsChangeHint_NeedReflow is sufficient.
     NS_UpdateHint(hint, nsChangeHint_UpdateEffects);
     NS_UpdateHint(hint, nsChangeHint_NeedReflow);
     NS_UpdateHint(hint, nsChangeHint_NeedDirtyReflow); // XXX remove me: bug 876085
     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
     return hint;
   }
   if (mFill != aOther.mFill ||
       mStroke != aOther.mStroke ||
       mFillOpacity != aOther.mFillOpacity ||
       mStrokeOpacity != aOther.mStrokeOpacity) {
     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
     if (HasStroke() != aOther.HasStroke() ||
         (!HasStroke() && HasFill() != aOther.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 nsSVGPathGeometryFrames.
       NS_UpdateHint(hint, nsChangeHint_NeedReflow);
       NS_UpdateHint(hint, nsChangeHint_NeedDirtyReflow); // XXX remove me: bug 876085
     }
     if (PaintURIChanged(mFill, aOther.mFill) ||
         PaintURIChanged(mStroke, aOther.mStroke)) {
       NS_UpdateHint(hint, nsChangeHint_UpdateEffects);
     }
   }
   // Stroke currently contributes to nsSVGPathGeometryFrame::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 nsSVGPathGeometryFrame::mRect.
   // text-anchor and text-rendering changes also require a reflow since they
   // change frames' rects.
   if (mStrokeWidth           != aOther.mStrokeWidth           ||
       mStrokeMiterlimit      != aOther.mStrokeMiterlimit      ||
       mStrokeLinecap         != aOther.mStrokeLinecap         ||
       mStrokeLinejoin        != aOther.mStrokeLinejoin        ||
       mTextAnchor            != aOther.mTextAnchor            ||
       mTextRendering         != aOther.mTextRendering) {
     NS_UpdateHint(hint, nsChangeHint_NeedReflow);
     NS_UpdateHint(hint, nsChangeHint_NeedDirtyReflow); // XXX remove me: bug 876085
     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
     return hint;
   }
   if (hint & nsChangeHint_RepaintFrame) {
     return hint; // we don't add anything else below
   }
   if ( mStrokeDashoffset      != aOther.mStrokeDashoffset      ||
        mClipRule              != aOther.mClipRule              ||
        mColorInterpolation    != aOther.mColorInterpolation    ||
        mColorInterpolationFilters != aOther.mColorInterpolationFilters ||
        mFillRule              != aOther.mFillRule              ||
        mImageRendering        != aOther.mImageRendering        ||
        mPaintOrder            != aOther.mPaintOrder            ||
        mShapeRendering        != aOther.mShapeRendering        ||
        mStrokeDasharrayLength != aOther.mStrokeDasharrayLength ||
        mFillOpacitySource     != aOther.mFillOpacitySource     ||
        mStrokeOpacitySource   != aOther.mStrokeOpacitySource   ||
        mStrokeDasharrayFromObject != aOther.mStrokeDasharrayFromObject ||
        mStrokeDashoffsetFromObject != aOther.mStrokeDashoffsetFromObject ||
        mStrokeWidthFromObject != aOther.mStrokeWidthFromObject) {
     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
     return hint;
   }
   // length of stroke dasharrays are the same (tested above) - check entries
   for (uint32_t i=0; i<mStrokeDasharrayLength; i++)
     if (mStrokeDasharray[i] != aOther.mStrokeDasharray[i]) {
       NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
       return hint;
     }
   return hint;
 }
 // --------------------
 // 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);
   }
   return *this;
 }
 bool
 nsStyleFilter::operator==(const nsStyleFilter& aOther) const
 {
   if (mType != aOther.mType) {
       return false;
   }
   if (mType == NS_STYLE_FILTER_URL) {
     return EqualURIs(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();
   }
 }
 void
 nsStyleFilter::SetFilterParameter(const nsStyleCoord& aFilterParameter,
                                   int32_t aType)
 {
   ReleaseRef();
   mFilterParameter = aFilterParameter;
   mType = aType;
 }
 void
 nsStyleFilter::SetURL(nsIURI* aURL)
 {
   NS_ASSERTION(aURL, "expected pointer");
   ReleaseRef();
   mURL = aURL;
   mURL->AddRef();
   mType = NS_STYLE_FILTER_URL;
 }
 void
 nsStyleFilter::SetDropShadow(nsCSSShadowArray* aDropShadow)
 {
   NS_ASSERTION(aDropShadow, "expected pointer");
   ReleaseRef();
   mDropShadow = aDropShadow;
   mDropShadow->AddRef();
   mType = NS_STYLE_FILTER_DROP_SHADOW;
 }
 // --------------------
 // nsStyleSVGReset
 //
 nsStyleSVGReset::nsStyleSVGReset()
 {
     MOZ_COUNT_CTOR(nsStyleSVGReset);
     mStopColor               = NS_RGB(0,0,0);
     mFloodColor              = NS_RGB(0,0,0);
     mLightingColor           = NS_RGB(255,255,255);
     mClipPath                = nullptr;
     mMask                    = nullptr;
     mStopOpacity             = 1.0f;
     mFloodOpacity            = 1.0f;
     mDominantBaseline        = NS_STYLE_DOMINANT_BASELINE_AUTO;
     mVectorEffect            = NS_STYLE_VECTOR_EFFECT_NONE;
     mMaskType                = NS_STYLE_MASK_TYPE_LUMINANCE;
 }
 nsStyleSVGReset::~nsStyleSVGReset()
 {
   MOZ_COUNT_DTOR(nsStyleSVGReset);
 }
 nsStyleSVGReset::nsStyleSVGReset(const nsStyleSVGReset& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleSVGReset);
   mStopColor = aSource.mStopColor;
   mFloodColor = aSource.mFloodColor;
   mLightingColor = aSource.mLightingColor;
   mClipPath = aSource.mClipPath;
   mFilters = aSource.mFilters;
   mMask = aSource.mMask;
   mStopOpacity = aSource.mStopOpacity;
   mFloodOpacity = aSource.mFloodOpacity;
   mDominantBaseline = aSource.mDominantBaseline;
   mVectorEffect = aSource.mVectorEffect;
   mMaskType = aSource.mMaskType;
 }
 nsChangeHint nsStyleSVGReset::CalcDifference(const nsStyleSVGReset& aOther) const
 {
   nsChangeHint hint = nsChangeHint(0);
   bool equalFilters = (mFilters == aOther.mFilters);
   if (!equalFilters) {
     NS_UpdateHint(hint, nsChangeHint_UpdateOverflow);
   }
   if (!EqualURIs(mClipPath, aOther.mClipPath) ||
       !EqualURIs(mMask, aOther.mMask) ||
       !equalFilters) {
     NS_UpdateHint(hint, nsChangeHint_UpdateEffects);
     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
   }
   if (mDominantBaseline != aOther.mDominantBaseline) {
     // XXXjwatt: why NS_STYLE_HINT_REFLOW? Isn't that excessive?
     NS_UpdateHint(hint, NS_STYLE_HINT_REFLOW);
   } else if (mVectorEffect  != aOther.mVectorEffect) {
     // Stroke currently affects nsSVGPathGeometryFrame::mRect, and
     // vector-effect affect stroke. As a result we need to reflow if
     // vector-effect changes in order to have nsSVGPathGeometryFrame::
     // ReflowSVG called to update its mRect. No intrinsic sizes need
     // to change so nsChangeHint_NeedReflow is sufficient.
     NS_UpdateHint(hint, nsChangeHint_NeedReflow);
     NS_UpdateHint(hint, nsChangeHint_NeedDirtyReflow); // XXX remove me: bug 876085
     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
   } else if (mStopColor     != aOther.mStopColor     ||
              mFloodColor    != aOther.mFloodColor    ||
              mLightingColor != aOther.mLightingColor ||
              mStopOpacity   != aOther.mStopOpacity   ||
              mFloodOpacity  != aOther.mFloodOpacity  ||
              mMaskType      != aOther.mMaskType) {
     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
   }
   return hint;
 }
 // nsStyleSVGPaint implementation
 nsStyleSVGPaint::~nsStyleSVGPaint()
 {
   if (mType == eStyleSVGPaintType_Server) {
     NS_IF_RELEASE(mPaint.mPaintServer);
   }
 }
 void
 nsStyleSVGPaint::SetType(nsStyleSVGPaintType aType)
 {
   if (mType == eStyleSVGPaintType_Server) {
     this->~nsStyleSVGPaint();
     new (this) nsStyleSVGPaint();
   }
   mType = aType;
 }
 nsStyleSVGPaint& nsStyleSVGPaint::operator=(const nsStyleSVGPaint& aOther)
 {
   if (this == &aOther)
     return *this;
   SetType(aOther.mType);
   mFallbackColor = aOther.mFallbackColor;
   if (mType == eStyleSVGPaintType_Server) {
     mPaint.mPaintServer = aOther.mPaint.mPaintServer;
     NS_IF_ADDREF(mPaint.mPaintServer);
   } else {
     mPaint.mColor = aOther.mPaint.mColor;
   }
   return *this;
 }
 bool nsStyleSVGPaint::operator==(const nsStyleSVGPaint& aOther) const
 {
   if (mType != aOther.mType)
     return false;
   if (mType == eStyleSVGPaintType_Server)
     return EqualURIs(mPaint.mPaintServer, aOther.mPaint.mPaintServer) &&
            mFallbackColor == aOther.mFallbackColor;
   if (mType == eStyleSVGPaintType_Color)
     return mPaint.mColor == aOther.mPaint.mColor;
   return true;
 }
 // --------------------
 // nsStylePosition
 //
 nsStylePosition::nsStylePosition(void)
 {
   MOZ_COUNT_CTOR(nsStylePosition);
   // positioning values not inherited
   nsStyleCoord  autoCoord(eStyleUnit_Auto);
   mOffset.SetLeft(autoCoord);
   mOffset.SetTop(autoCoord);
   mOffset.SetRight(autoCoord);
   mOffset.SetBottom(autoCoord);
   mWidth.SetAutoValue();
   mMinWidth.SetCoordValue(0);
   mMaxWidth.SetNoneValue();
   mHeight.SetAutoValue();
   mMinHeight.SetCoordValue(0);
   mMaxHeight.SetNoneValue();
   mFlexBasis.SetAutoValue();
   // The initial value of grid-auto-columns and grid-auto-rows is 'auto',
   // which computes to 'minmax(min-content, max-content)'.
   mGridAutoColumnsMin.SetIntValue(NS_STYLE_GRID_TRACK_BREADTH_MIN_CONTENT,
                                   eStyleUnit_Enumerated);
   mGridAutoColumnsMax.SetIntValue(NS_STYLE_GRID_TRACK_BREADTH_MAX_CONTENT,
                                   eStyleUnit_Enumerated);
   mGridAutoRowsMin.SetIntValue(NS_STYLE_GRID_TRACK_BREADTH_MIN_CONTENT,
                                eStyleUnit_Enumerated);
   mGridAutoRowsMax.SetIntValue(NS_STYLE_GRID_TRACK_BREADTH_MAX_CONTENT,
                                eStyleUnit_Enumerated);
   mGridAutoFlow = NS_STYLE_GRID_AUTO_FLOW_NONE;
   mBoxSizing = NS_STYLE_BOX_SIZING_CONTENT;
   mAlignContent = NS_STYLE_ALIGN_CONTENT_STRETCH;
   mAlignItems = NS_STYLE_ALIGN_ITEMS_INITIAL_VALUE;
   mAlignSelf = NS_STYLE_ALIGN_SELF_AUTO;
   mFlexDirection = NS_STYLE_FLEX_DIRECTION_ROW;
   mFlexWrap = NS_STYLE_FLEX_WRAP_NOWRAP;
   mJustifyContent = NS_STYLE_JUSTIFY_CONTENT_FLEX_START;
   mOrder = NS_STYLE_ORDER_INITIAL;
   mFlexGrow = 0.0f;
   mFlexShrink = 1.0f;
   mZIndex.SetAutoValue();
   mGridAutoPositionColumn.SetToInteger(1);
   mGridAutoPositionRow.SetToInteger(1);
   // 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(void)
 {
   MOZ_COUNT_DTOR(nsStylePosition);
 }
 nsStylePosition::nsStylePosition(const nsStylePosition& aSource)
   : mGridTemplateColumns(aSource.mGridTemplateColumns)
   , mGridTemplateRows(aSource.mGridTemplateRows)
   , mGridTemplateAreas(aSource.mGridTemplateAreas)
   , mGridAutoPositionColumn(aSource.mGridAutoPositionColumn)
   , mGridAutoPositionRow(aSource.mGridAutoPositionRow)
   , mGridColumnStart(aSource.mGridColumnStart)
   , mGridColumnEnd(aSource.mGridColumnEnd)
   , mGridRowStart(aSource.mGridRowStart)
   , mGridRowEnd(aSource.mGridRowEnd)
 {
   MOZ_COUNT_CTOR(nsStylePosition);
   // If you add any memcpy'able member vars,
   // they should be declared before mGridTemplateColumns.
   // If you add any non-memcpy'able member vars,
   // they should be declared after mGridTemplateColumns,
   // and you should invoke their copy constructor in the init list above
   // and update this static-assert to include their "sizeof()"
   static_assert(sizeof(nsStylePosition) ==
                 offsetof(nsStylePosition, mGridTemplateColumns) +
                 sizeof(mGridTemplateColumns) +
                 sizeof(mGridTemplateRows) +
                 sizeof(mGridTemplateAreas) +
                 sizeof(mGridAutoPositionColumn) +
                 sizeof(mGridAutoPositionRow) +
                 sizeof(mGridColumnStart) +
                 sizeof(mGridColumnEnd) +
                 sizeof(mGridRowStart) +
                 sizeof(mGridRowEnd),
                 "Unexpected size or offset in nsStylePosition");
   memcpy((nsStylePosition*) this,
          &aSource,
          offsetof(nsStylePosition, mGridTemplateColumns));
 }
 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;
 }
 nsChangeHint nsStylePosition::CalcDifference(const nsStylePosition& aOther) const
 {
   nsChangeHint hint =
     (mZIndex == aOther.mZIndex) ? NS_STYLE_HINT_NONE : nsChangeHint_RepaintFrame;
   if (mBoxSizing != aOther.mBoxSizing) {
     // Can affect both widths and heights; just a bad scene.
     return NS_CombineHint(hint, nsChangeHint_AllReflowHints);
   }
   // Properties that apply to flex items:
   // NOTE: Changes to "order" on a flex item may trigger some repositioning.
   // If we're in a multi-line flex container, it also may affect our size
   // (and that of our container & siblings) by shuffling items between lines.
   if (mAlignSelf != aOther.mAlignSelf ||
       mFlexBasis != aOther.mFlexBasis ||
       mFlexGrow != aOther.mFlexGrow ||
       mFlexShrink != aOther.mFlexShrink ||
       mOrder != aOther.mOrder) {
     return NS_CombineHint(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 != aOther.mAlignItems ||
       mFlexDirection != aOther.mFlexDirection ||
       mFlexWrap != aOther.mFlexWrap) {
     return NS_CombineHint(hint, nsChangeHint_AllReflowHints);
   }
   // Properties that apply to grid containers:
   // FIXME: only for grid containers
   // (ie. 'display: grid' or 'display: inline-grid')
   if (mGridTemplateColumns != aOther.mGridTemplateColumns ||
       mGridTemplateRows != aOther.mGridTemplateRows ||
       mGridTemplateAreas != aOther.mGridTemplateAreas ||
       mGridAutoColumnsMin != aOther.mGridAutoColumnsMin ||
       mGridAutoColumnsMax != aOther.mGridAutoColumnsMax ||
       mGridAutoRowsMin != aOther.mGridAutoRowsMin ||
       mGridAutoRowsMax != aOther.mGridAutoRowsMax ||
       mGridAutoFlow != aOther.mGridAutoFlow) {
     return NS_CombineHint(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 != aOther.mGridColumnStart ||
       mGridColumnEnd != aOther.mGridColumnEnd ||
       mGridRowStart != aOther.mGridRowStart ||
       mGridRowEnd != aOther.mGridRowEnd) {
     return NS_CombineHint(hint, nsChangeHint_AllReflowHints);
   }
   // Changing justify-content on a flexbox might affect the positioning of its
   // children, but it won't affect any sizing.
   if (mJustifyContent != aOther.mJustifyContent) {
     NS_UpdateHint(hint, nsChangeHint_NeedReflow);
   }
   // Properties that apply only to multi-line flex containers:
   // 'align-content' can change the positioning & sizing of a multi-line flex
   // container's children when there's extra space in the cross axis, but it
   // shouldn't affect the container's own sizing.
   //
   // NOTE: If we get here, we know that mFlexWrap == aOther.mFlexWrap
   // (otherwise, we would've returned earlier). So it doesn't matter which one
   // of those we check to see if we're multi-line.
   if (mFlexWrap != NS_STYLE_FLEX_WRAP_NOWRAP &&
       mAlignContent != aOther.mAlignContent) {
     NS_UpdateHint(hint, nsChangeHint_NeedReflow);
   }
   if (mHeight != aOther.mHeight ||
       mMinHeight != aOther.mMinHeight ||
       mMaxHeight != aOther.mMaxHeight) {
     // Height changes can affect descendant intrinsic sizes due to replaced
     // elements with percentage heights in descendants which also have
     // percentage heights.  And due to our not-so-great computation of mVResize
     // in nsHTMLReflowState, they do need to force reflow of the whole subtree.
     // XXXbz due to XUL caching heights as well, height changes also need to
     // clear ancestor intrinsics!
     return NS_CombineHint(hint, nsChangeHint_AllReflowHints);
   }
   if (mWidth != aOther.mWidth ||
       mMinWidth != aOther.mMinWidth ||
       mMaxWidth != aOther.mMaxWidth) {
     // None of our width differences can affect descendant intrinsic
     // sizes and none of them need to force children to reflow.
     return
       NS_CombineHint(hint,
                      NS_SubtractHint(nsChangeHint_AllReflowHints,
                                      NS_CombineHint(nsChangeHint_ClearDescendantIntrinsics,
                                                     nsChangeHint_NeedDirtyReflow)));
   }
   // If width and height have not changed, but 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 != aOther.mOffset) {
     if (IsAutonessEqual(mOffset, aOther.mOffset)) {
       NS_UpdateHint(hint, nsChangeHint(nsChangeHint_RecomputePosition |
                                        nsChangeHint_UpdateOverflow));
     } else {
       return NS_CombineHint(hint, nsChangeHint_AllReflowHints);
     }
   }
   return hint;
 }
 /* static */ bool
 nsStylePosition::WidthCoordDependsOnContainer(const nsStyleCoord &aCoord)
 {
   return aCoord.GetUnit() == eStyleUnit_Auto ||
          aCoord.HasPercent() ||
          (aCoord.GetUnit() == eStyleUnit_Enumerated &&
           (aCoord.GetIntValue() == NS_STYLE_WIDTH_FIT_CONTENT ||
            aCoord.GetIntValue() == NS_STYLE_WIDTH_AVAILABLE));
 }
 // --------------------
 // nsStyleTable
 //
 nsStyleTable::nsStyleTable()
 {
   MOZ_COUNT_CTOR(nsStyleTable);
   // values not inherited
   mLayoutStrategy = NS_STYLE_TABLE_LAYOUT_AUTO;
   mFrame = NS_STYLE_TABLE_FRAME_NONE;
   mRules = NS_STYLE_TABLE_RULES_NONE;
   mSpan = 1;
 }
 nsStyleTable::~nsStyleTable(void)
 {
   MOZ_COUNT_DTOR(nsStyleTable);
 }
 nsStyleTable::nsStyleTable(const nsStyleTable& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleTable);
   memcpy((nsStyleTable*)this, &aSource, sizeof(nsStyleTable));
 }
 nsChangeHint nsStyleTable::CalcDifference(const nsStyleTable& aOther) const
 {
   // Changes in mRules may require reframing (if border-collapse stuff changes, for example).
   if (mRules != aOther.mRules || mSpan != aOther.mSpan ||
       mLayoutStrategy != aOther.mLayoutStrategy)
     return NS_STYLE_HINT_FRAMECHANGE;
   if (mFrame != aOther.mFrame)
     return NS_STYLE_HINT_REFLOW;
   return NS_STYLE_HINT_NONE;
 }
 // -----------------------
 // nsStyleTableBorder
 nsStyleTableBorder::nsStyleTableBorder(nsPresContext* aPresContext)
 {
   MOZ_COUNT_CTOR(nsStyleTableBorder);
   mBorderCollapse = NS_STYLE_BORDER_SEPARATE;
   nsCompatibility compatMode = eCompatibility_FullStandards;
   if (aPresContext)
     compatMode = aPresContext->CompatibilityMode();
   mEmptyCells = (compatMode == eCompatibility_NavQuirks)
                   ? NS_STYLE_TABLE_EMPTY_CELLS_SHOW_BACKGROUND
                   : NS_STYLE_TABLE_EMPTY_CELLS_SHOW;
   mCaptionSide = NS_STYLE_CAPTION_SIDE_TOP;
   mBorderSpacingX = 0;
   mBorderSpacingY = 0;
 }
 nsStyleTableBorder::~nsStyleTableBorder(void)
 {
   MOZ_COUNT_DTOR(nsStyleTableBorder);
 }
 nsStyleTableBorder::nsStyleTableBorder(const nsStyleTableBorder& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleTableBorder);
   memcpy((nsStyleTableBorder*)this, &aSource, sizeof(nsStyleTableBorder));
 }
 nsChangeHint nsStyleTableBorder::CalcDifference(const nsStyleTableBorder& aOther) 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 != aOther.mBorderCollapse) {
     return NS_STYLE_HINT_FRAMECHANGE;
   }
   if ((mCaptionSide == aOther.mCaptionSide) &&
       (mBorderSpacingX == aOther.mBorderSpacingX) &&
       (mBorderSpacingY == aOther.mBorderSpacingY)) {
     if (mEmptyCells == aOther.mEmptyCells)
       return NS_STYLE_HINT_NONE;
     return NS_STYLE_HINT_VISUAL;
   }
   else
     return NS_STYLE_HINT_REFLOW;
 }
 // --------------------
 // nsStyleColor
 //
 nsStyleColor::nsStyleColor(nsPresContext* aPresContext)
 {
   MOZ_COUNT_CTOR(nsStyleColor);
   mColor = aPresContext->DefaultColor();
 }
 nsStyleColor::nsStyleColor(const nsStyleColor& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleColor);
   mColor = aSource.mColor;
 }
 nsChangeHint nsStyleColor::CalcDifference(const nsStyleColor& aOther) const
 {
   if (mColor == aOther.mColor)
     return NS_STYLE_HINT_NONE;
   return NS_STYLE_HINT_VISUAL;
 }
 // --------------------
 // nsStyleGradient
 //
 bool
 nsStyleGradient::operator==(const nsStyleGradient& aOther) const
 {
   NS_ABORT_IF_FALSE(mSize == NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER ||
                     mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR,
                     "incorrect combination of shape and size");
   NS_ABORT_IF_FALSE(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 ||
       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++) {
     if (mStops[i].mLocation != aOther.mStops[i].mLocation ||
         mStops[i].mColor != aOther.mStops[i].mColor)
       return false;
   }
   return true;
 }
 nsStyleGradient::nsStyleGradient(void)
   : mShape(NS_STYLE_GRADIENT_SHAPE_LINEAR)
   , mSize(NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER)
   , mRepeating(false)
   , mLegacySyntax(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();
 }
 // --------------------
 // nsStyleImage
 //
 nsStyleImage::nsStyleImage()
   : mType(eStyleImageType_Null)
   , mCropRect(nullptr)
 #ifdef DEBUG
   , mImageTracked(false)
 #endif
 {
   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)
 #ifdef DEBUG
   , mImageTracked(false)
 #endif
 {
   // 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)
     SetImageData(aOther.mImage);
   else if (aOther.mType == eStyleImageType_Gradient)
     SetGradientData(aOther.mGradient);
   else if (aOther.mType == eStyleImageType_Element)
     SetElementId(aOther.mElementId);
   SetCropRect(aOther.mCropRect);
 }
 void
 nsStyleImage::SetNull()
 {
   NS_ABORT_IF_FALSE(!mImageTracked,
                     "Calling SetNull() with image tracked!");
   if (mType == eStyleImageType_Gradient)
     mGradient->Release();
   else if (mType == eStyleImageType_Image)
     NS_RELEASE(mImage);
   else if (mType == eStyleImageType_Element)
     NS_Free(mElementId);
   mType = eStyleImageType_Null;
   mCropRect = nullptr;
 }
 void
 nsStyleImage::SetImageData(imgIRequest* aImage)
 {
   NS_ABORT_IF_FALSE(!mImageTracked,
                     "Setting a new image without untracking the old one!");
   NS_IF_ADDREF(aImage);
   if (mType != eStyleImageType_Null)
     SetNull();
   if (aImage) {
     mImage = aImage;
     mType = eStyleImageType_Image;
   }
   mSubImages.Clear();
 }
 void
 nsStyleImage::TrackImage(nsPresContext* aContext)
 {
   // Sanity
   NS_ABORT_IF_FALSE(!mImageTracked, "Already tracking image!");
   NS_ABORT_IF_FALSE(mType == eStyleImageType_Image,
                     "Can't track image when there isn't one!");
   // Register the image with the document
   nsIDocument* doc = aContext->Document();
   if (doc)
     doc->AddImage(mImage);
   // Mark state
 #ifdef DEBUG
   mImageTracked = true;
 #endif
 }
 void
 nsStyleImage::UntrackImage(nsPresContext* aContext)
 {
   // Sanity
   NS_ABORT_IF_FALSE(mImageTracked, "Image not tracked!");
   NS_ABORT_IF_FALSE(mType == eStyleImageType_Image,
                     "Can't untrack image when there isn't one!");
   // Unregister the image with the document
   nsIDocument* doc = aContext->Document();
   if (doc)
     doc->RemoveImage(mImage, nsIDocument::REQUEST_DISCARD);
   // Mark state
 #ifdef DEBUG
   mImageTracked = false;
 #endif
 }
 void
 nsStyleImage::SetGradientData(nsStyleGradient* aGradient)
 {
   if (aGradient)
     aGradient->AddRef();
   if (mType != eStyleImageType_Null)
     SetNull();
   if (aGradient) {
     mGradient = aGradient;
     mType = eStyleImageType_Gradient;
   }
 }
 void
 nsStyleImage::SetElementId(const char16_t* aElementId)
 {
   if (mType != eStyleImageType_Null)
     SetNull();
   if (aElementId) {
     mElementId = NS_strdup(aElementId);
     mType = eStyleImageType_Element;
   }
 }
 void
 nsStyleImage::SetCropRect(nsStyleSides* aCropRect)
 {
   if (aCropRect) {
     mCropRect = new nsStyleSides(*aCropRect);
     // There is really not much we can do if 'new' fails
   } else {
     mCropRect = nullptr;
   }
 }
 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;
   }
   NS_ABORT_IF_FALSE(pixelValue >= 0, "we ensured non-negative while parsing");
   pixelValue = std::min(pixelValue, double(INT32_MAX)); // avoid overflow
   return NS_lround(pixelValue);
 }
 bool
 nsStyleImage::ComputeActualCropRect(nsIntRect& aActualCropRect,
                                     bool* aIsEntireImage) const
 {
   if (mType != eStyleImageType_Image)
     return false;
   nsCOMPtr<imgIContainer> imageContainer;
   mImage->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;
 }
 nsresult
 nsStyleImage::StartDecoding() const
 {
   if ((mType == eStyleImageType_Image) && mImage)
     return mImage->StartDecoding();
   return NS_OK;
 }
 bool
 nsStyleImage::IsOpaque() const
 {
   if (!IsComplete())
     return false;
   if (mType == eStyleImageType_Gradient)
     return mGradient->IsOpaque();
   if (mType == eStyleImageType_Element)
     return false;
   NS_ABORT_IF_FALSE(mType == eStyleImageType_Image, "unexpected image type");
   nsCOMPtr<imgIContainer> imageContainer;
   mImage->GetImage(getter_AddRefs(imageContainer));
   NS_ABORT_IF_FALSE(imageContainer, "IsComplete() said image container is ready");
   // Check if the crop region of the current image frame is opaque.
   if (imageContainer->FrameIsOpaque(imgIContainer::FRAME_CURRENT)) {
     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;
     bool rv = ComputeActualCropRect(actualCropRect);
     NS_ASSERTION(rv, "ComputeActualCropRect() can not fail here");
     return rv && !actualCropRect.IsEmpty();
   }
   return false;
 }
 bool
 nsStyleImage::IsComplete() const
 {
   switch (mType) {
     case eStyleImageType_Null:
       return false;
     case eStyleImageType_Gradient:
     case eStyleImageType_Element:
       return true;
     case eStyleImageType_Image:
     {
       uint32_t status = imgIRequest::STATUS_ERROR;
       return NS_SUCCEEDED(mImage->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:
       return true;
     case eStyleImageType_Image:
     {
       uint32_t status = imgIRequest::STATUS_ERROR;
       return NS_SUCCEEDED(mImage->GetImageStatus(&status)) &&
              !(status & imgIRequest::STATUS_ERROR) &&
              (status & imgIRequest::STATUS_LOAD_COMPLETE);
     }
     default:
       NS_NOTREACHED("unexpected image type");
       return false;
   }
 }
 static inline bool
 EqualRects(const nsStyleSides* aRect1, const 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 EqualImages(mImage, aOther.mImage);
   if (mType == eStyleImageType_Gradient)
     return *mGradient == *aOther.mGradient;
   if (mType == eStyleImageType_Element)
     return NS_strcmp(mElementId, aOther.mElementId) == 0;
   return true;
 }
 // --------------------
 // nsStyleBackground
 //
 nsStyleBackground::nsStyleBackground()
   : mAttachmentCount(1)
   , mClipCount(1)
   , mOriginCount(1)
   , mRepeatCount(1)
   , mPositionCount(1)
   , mImageCount(1)
   , mSizeCount(1)
   , mBlendModeCount(1)
   , mBackgroundColor(NS_RGBA(0, 0, 0, 0))
   , mBackgroundInlinePolicy(NS_STYLE_BG_INLINE_POLICY_CONTINUOUS)
 {
   MOZ_COUNT_CTOR(nsStyleBackground);
   Layer *onlyLayer = mLayers.AppendElement();
   NS_ASSERTION(onlyLayer, "auto array must have room for 1 element");
   onlyLayer->SetInitialValues();
 }
 nsStyleBackground::nsStyleBackground(const nsStyleBackground& aSource)
   : mAttachmentCount(aSource.mAttachmentCount)
   , mClipCount(aSource.mClipCount)
   , mOriginCount(aSource.mOriginCount)
   , mRepeatCount(aSource.mRepeatCount)
   , mPositionCount(aSource.mPositionCount)
   , mImageCount(aSource.mImageCount)
   , mSizeCount(aSource.mSizeCount)
   , mBlendModeCount(aSource.mBlendModeCount)
   , mLayers(aSource.mLayers) // deep copy
   , mBackgroundColor(aSource.mBackgroundColor)
   , mBackgroundInlinePolicy(aSource.mBackgroundInlinePolicy)
 {
   MOZ_COUNT_CTOR(nsStyleBackground);
   // 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);
     mPositionCount = std::max(mPositionCount, count);
     mImageCount = std::max(mImageCount, count);
     mSizeCount = std::max(mSizeCount, count);
     mBlendModeCount = std::max(mSizeCount, count);
   }
 }
 nsStyleBackground::~nsStyleBackground()
 {
   MOZ_COUNT_DTOR(nsStyleBackground);
 }
 void
 nsStyleBackground::Destroy(nsPresContext* aContext)
 {
   // Untrack all the images stored in our layers
   for (uint32_t i = 0; i < mImageCount; ++i)
     mLayers[i].UntrackImages(aContext);
   this->~nsStyleBackground();
   aContext->FreeToShell(sizeof(nsStyleBackground), this);
 }
 nsChangeHint nsStyleBackground::CalcDifference(const nsStyleBackground& aOther) const
 {
   const nsStyleBackground* moreLayers =
     mImageCount > aOther.mImageCount ? this : &aOther;
   const nsStyleBackground* lessLayers =
     mImageCount > aOther.mImageCount ? &aOther : this;
   bool hasVisualDifference = false;
   NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, moreLayers) {
     if (i < lessLayers->mImageCount) {
       if (moreLayers->mLayers[i] != lessLayers->mLayers[i]) {
         if ((moreLayers->mLayers[i].mImage.GetType() == eStyleImageType_Element) ||
             (lessLayers->mLayers[i].mImage.GetType() == eStyleImageType_Element))
           return NS_CombineHint(nsChangeHint_UpdateEffects, NS_STYLE_HINT_VISUAL);
         hasVisualDifference = true;
       }
     } else {
       if (moreLayers->mLayers[i].mImage.GetType() == eStyleImageType_Element)
         return NS_CombineHint(nsChangeHint_UpdateEffects, NS_STYLE_HINT_VISUAL);
       hasVisualDifference = true;
     }
   }
   if (hasVisualDifference ||
       mBackgroundColor != aOther.mBackgroundColor ||
       mBackgroundInlinePolicy != aOther.mBackgroundInlinePolicy)
     return NS_STYLE_HINT_VISUAL;
   return NS_STYLE_HINT_NONE;
 }
 bool nsStyleBackground::HasFixedBackground() const
 {
   NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, this) {
     const Layer &layer = mLayers[i];
     if (layer.mAttachment == NS_STYLE_BG_ATTACHMENT_FIXED &&
         !layer.mImage.IsEmpty()) {
       return true;
     }
   }
   return false;
 }
 bool nsStyleBackground::IsTransparent() const
 {
   return BottomLayer().mImage.IsEmpty() &&
          mImageCount == 1 &&
          NS_GET_A(mBackgroundColor) == 0;
 }
 void
 nsStyleBackground::Position::SetInitialValues()
 {
   // Initial value is "0% 0%"
   mXPosition.mPercent = 0.0f;
   mXPosition.mLength = 0;
   mXPosition.mHasPercent = true;
   mYPosition.mPercent = 0.0f;
   mYPosition.mLength = 0;
   mYPosition.mHasPercent = true;
 }
 bool
 nsStyleBackground::Size::DependsOnPositioningAreaSize(const nsStyleImage& aImage) const
 {
   NS_ABORT_IF_FALSE(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;
   }
   NS_ABORT_IF_FALSE((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;
     aImage.GetImageData()->GetImage(getter_AddRefs(imgContainer));
     if (imgContainer) {
       nsIntSize 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
 nsStyleBackground::Size::SetInitialValues()
 {
   mWidthType = mHeightType = eAuto;
 }
 bool
 nsStyleBackground::Size::operator==(const Size& aOther) const
 {
   NS_ABORT_IF_FALSE(mWidthType < eDimensionType_COUNT,
                     "bad mWidthType for this");
   NS_ABORT_IF_FALSE(mHeightType < eDimensionType_COUNT,
                     "bad mHeightType for this");
   NS_ABORT_IF_FALSE(aOther.mWidthType < eDimensionType_COUNT,
                     "bad mWidthType for aOther");
   NS_ABORT_IF_FALSE(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);
 }
 void
 nsStyleBackground::Repeat::SetInitialValues()
 {
   mXRepeat = NS_STYLE_BG_REPEAT_REPEAT;
   mYRepeat = NS_STYLE_BG_REPEAT_REPEAT;
 }
 nsStyleBackground::Layer::Layer()
 {
 }
 nsStyleBackground::Layer::~Layer()
 {
 }
 void
 nsStyleBackground::Layer::SetInitialValues()
 {
   mAttachment = NS_STYLE_BG_ATTACHMENT_SCROLL;
   mClip = NS_STYLE_BG_CLIP_BORDER;
   mOrigin = NS_STYLE_BG_ORIGIN_PADDING;
   mRepeat.SetInitialValues();
   mBlendMode = NS_STYLE_BLEND_NORMAL;
   mPosition.SetInitialValues();
   mSize.SetInitialValues();
   mImage.SetNull();
 }
 bool
 nsStyleBackground::Layer::RenderingMightDependOnPositioningAreaSizeChange() const
 {
   // Do we even have an image?
   if (mImage.IsEmpty()) {
     return false;
   }
   return mPosition.DependsOnPositioningAreaSize() ||
       mSize.DependsOnPositioningAreaSize(mImage);
 }
 bool
 nsStyleBackground::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;
 }
 // --------------------
 // nsStyleDisplay
 //
 void nsTimingFunction::AssignFromKeyword(int32_t aTimingFunctionType)
 {
   switch (aTimingFunctionType) {
     case NS_STYLE_TRANSITION_TIMING_FUNCTION_STEP_START:
       mType = StepStart;
       mSteps = 1;
       return;
     case NS_STYLE_TRANSITION_TIMING_FUNCTION_STEP_END:
       mType = StepEnd;
       mSteps = 1;
       return;
     default:
       mType = Function;
       break;
   }
   static_assert(NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE == 0 &&
                 NS_STYLE_TRANSITION_TIMING_FUNCTION_LINEAR == 1 &&
                 NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE_IN == 2 &&
                 NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE_OUT == 3 &&
                 NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE_IN_OUT == 4,
                 "transition timing function constants not as expected");
   static const float timingFunctionValues[5][4] = {
     { 0.25f, 0.10f, 0.25f, 1.00f }, // ease
     { 0.00f, 0.00f, 1.00f, 1.00f }, // linear
     { 0.42f, 0.00f, 1.00f, 1.00f }, // ease-in
     { 0.00f, 0.00f, 0.58f, 1.00f }, // ease-out
     { 0.42f, 0.00f, 0.58f, 1.00f }  // ease-in-out
   };
   NS_ABORT_IF_FALSE(0 <= aTimingFunctionType && aTimingFunctionType < 5,
                     "keyword out of range");
   mFunc.mX1 = timingFunctionValues[aTimingFunctionType][0];
   mFunc.mY1 = timingFunctionValues[aTimingFunctionType][1];
   mFunc.mX2 = timingFunctionValues[aTimingFunctionType][2];
   mFunc.mY2 = timingFunctionValues[aTimingFunctionType][3];
 }
 nsTransition::nsTransition(const nsTransition& aCopy)
   : mTimingFunction(aCopy.mTimingFunction)
   , mDuration(aCopy.mDuration)
   , mDelay(aCopy.mDelay)
   , mProperty(aCopy.mProperty)
   , mUnknownProperty(aCopy.mUnknownProperty)
 {
 }
 void nsTransition::SetInitialValues()
 {
   mTimingFunction = nsTimingFunction(NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE);
   mDuration = 0.0;
   mDelay = 0.0;
   mProperty = eCSSPropertyExtra_all_properties;
 }
 void nsTransition::SetUnknownProperty(const nsAString& aUnknownProperty)
 {
   NS_ASSERTION(nsCSSProps::LookupProperty(aUnknownProperty,
                                           nsCSSProps::eEnabledForAllContent) ==
                  eCSSProperty_UNKNOWN,
                "should be unknown property");
   mProperty = eCSSProperty_UNKNOWN;
   mUnknownProperty = do_GetAtom(aUnknownProperty);
 }
 nsAnimation::nsAnimation(const nsAnimation& aCopy)
   : mTimingFunction(aCopy.mTimingFunction)
   , mDuration(aCopy.mDuration)
   , mDelay(aCopy.mDelay)
   , mName(aCopy.mName)
   , mDirection(aCopy.mDirection)
   , mFillMode(aCopy.mFillMode)
   , mPlayState(aCopy.mPlayState)
   , mIterationCount(aCopy.mIterationCount)
 {
 }
 void
 nsAnimation::SetInitialValues()
 {
   mTimingFunction = nsTimingFunction(NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE);
   mDuration = 0.0;
   mDelay = 0.0;
   mName = EmptyString();
   mDirection = NS_STYLE_ANIMATION_DIRECTION_NORMAL;
   mFillMode = NS_STYLE_ANIMATION_FILL_MODE_NONE;
   mPlayState = NS_STYLE_ANIMATION_PLAY_STATE_RUNNING;
   mIterationCount = 1.0f;
 }
 nsStyleDisplay::nsStyleDisplay()
   : mWillChangeBitField(0)
 {
   MOZ_COUNT_CTOR(nsStyleDisplay);
   mAppearance = NS_THEME_NONE;
   mDisplay = NS_STYLE_DISPLAY_INLINE;
   mOriginalDisplay = mDisplay;
   mPosition = NS_STYLE_POSITION_STATIC;
   mFloats = NS_STYLE_FLOAT_NONE;
   mOriginalFloats = mFloats;
   mBreakType = NS_STYLE_CLEAR_NONE;
   mBreakInside = NS_STYLE_PAGE_BREAK_AUTO;
   mBreakBefore = false;
   mBreakAfter = false;
   mOverflowX = NS_STYLE_OVERFLOW_VISIBLE;
   mOverflowY = NS_STYLE_OVERFLOW_VISIBLE;
   mOverflowClipBox = NS_STYLE_OVERFLOW_CLIP_BOX_PADDING_BOX;
   mResize = NS_STYLE_RESIZE_NONE;
   mClipFlags = NS_STYLE_CLIP_AUTO;
   mClip.SetRect(0,0,0,0);
   mOpacity = 1.0f;
   mSpecifiedTransform = nullptr;
   mTransformOrigin[0].SetPercentValue(0.5f); // Transform is centered on origin
   mTransformOrigin[1].SetPercentValue(0.5f);
   mTransformOrigin[2].SetCoordValue(0);
   mPerspectiveOrigin[0].SetPercentValue(0.5f);
   mPerspectiveOrigin[1].SetPercentValue(0.5f);
   mChildPerspective.SetNoneValue();
   mBackfaceVisibility = NS_STYLE_BACKFACE_VISIBILITY_VISIBLE;
   mTransformStyle = NS_STYLE_TRANSFORM_STYLE_FLAT;
   mOrient = NS_STYLE_ORIENT_AUTO;
   mMixBlendMode = NS_STYLE_BLEND_NORMAL;
   mTouchAction = NS_STYLE_TOUCH_ACTION_AUTO;
   mTransitions.AppendElement();
   NS_ABORT_IF_FALSE(mTransitions.Length() == 1,
                     "appending within auto buffer should never fail");
   mTransitions[0].SetInitialValues();
   mTransitionTimingFunctionCount = 1;
   mTransitionDurationCount = 1;
   mTransitionDelayCount = 1;
   mTransitionPropertyCount = 1;
   mAnimations.AppendElement();
   NS_ABORT_IF_FALSE(mAnimations.Length() == 1,
                     "appending within auto buffer should never fail");
   mAnimations[0].SetInitialValues();
   mAnimationTimingFunctionCount = 1;
   mAnimationDurationCount = 1;
   mAnimationDelayCount = 1;
   mAnimationNameCount = 1;
   mAnimationDirectionCount = 1;
   mAnimationFillModeCount = 1;
   mAnimationPlayStateCount = 1;
   mAnimationIterationCountCount = 1;
 }
 nsStyleDisplay::nsStyleDisplay(const nsStyleDisplay& aSource)
   : mBinding(aSource.mBinding)
   , mClip(aSource.mClip)
   , mOpacity(aSource.mOpacity)
   , mDisplay(aSource.mDisplay)
   , mOriginalDisplay(aSource.mOriginalDisplay)
   , mAppearance(aSource.mAppearance)
   , mPosition(aSource.mPosition)
   , mFloats(aSource.mFloats)
   , mOriginalFloats(aSource.mOriginalFloats)
   , mBreakType(aSource.mBreakType)
   , mBreakInside(aSource.mBreakInside)
   , mBreakBefore(aSource.mBreakBefore)
   , mBreakAfter(aSource.mBreakAfter)
   , mOverflowX(aSource.mOverflowX)
   , mOverflowY(aSource.mOverflowY)
   , mOverflowClipBox(aSource.mOverflowClipBox)
   , mResize(aSource.mResize)
   , mClipFlags(aSource.mClipFlags)
   , mOrient(aSource.mOrient)
   , mMixBlendMode(aSource.mMixBlendMode)
   , mWillChangeBitField(aSource.mWillChangeBitField)
   , mWillChange(aSource.mWillChange)
   , mTouchAction(aSource.mTouchAction)
   , mBackfaceVisibility(aSource.mBackfaceVisibility)
   , mTransformStyle(aSource.mTransformStyle)
   , mSpecifiedTransform(aSource.mSpecifiedTransform)
   , mChildPerspective(aSource.mChildPerspective)
   , mTransitions(aSource.mTransitions)
   , mTransitionTimingFunctionCount(aSource.mTransitionTimingFunctionCount)
   , mTransitionDurationCount(aSource.mTransitionDurationCount)
   , mTransitionDelayCount(aSource.mTransitionDelayCount)
   , mTransitionPropertyCount(aSource.mTransitionPropertyCount)
   , mAnimations(aSource.mAnimations)
   , mAnimationTimingFunctionCount(aSource.mAnimationTimingFunctionCount)
   , mAnimationDurationCount(aSource.mAnimationDurationCount)
   , mAnimationDelayCount(aSource.mAnimationDelayCount)
   , mAnimationNameCount(aSource.mAnimationNameCount)
   , mAnimationDirectionCount(aSource.mAnimationDirectionCount)
   , mAnimationFillModeCount(aSource.mAnimationFillModeCount)
   , mAnimationPlayStateCount(aSource.mAnimationPlayStateCount)
   , mAnimationIterationCountCount(aSource.mAnimationIterationCountCount)
 {
   MOZ_COUNT_CTOR(nsStyleDisplay);
   /* Copy over transform origin. */
   mTransformOrigin[0] = aSource.mTransformOrigin[0];
   mTransformOrigin[1] = aSource.mTransformOrigin[1];
   mTransformOrigin[2] = aSource.mTransformOrigin[2];
   mPerspectiveOrigin[0] = aSource.mPerspectiveOrigin[0];
   mPerspectiveOrigin[1] = aSource.mPerspectiveOrigin[1];
 }
 nsChangeHint nsStyleDisplay::CalcDifference(const nsStyleDisplay& aOther) const
 {
   nsChangeHint hint = nsChangeHint(0);
   if (!EqualURIs(mBinding, aOther.mBinding)
       || mPosition != aOther.mPosition
       || mDisplay != aOther.mDisplay
       || (mFloats == NS_STYLE_FLOAT_NONE) != (aOther.mFloats == NS_STYLE_FLOAT_NONE)
       || mOverflowX != aOther.mOverflowX
       || mOverflowY != aOther.mOverflowY
       || mResize != aOther.mResize)
     NS_UpdateHint(hint, nsChangeHint_ReconstructFrame);
   if ((mAppearance == NS_THEME_TEXTFIELD &&
        aOther.mAppearance != NS_THEME_TEXTFIELD) ||
       (mAppearance != NS_THEME_TEXTFIELD &&
        aOther.mAppearance == NS_THEME_TEXTFIELD)) {
     // This is for <input type=number> where we allow authors to specify a
     // |-moz-appearance:textfield| to get a control without a spinner. (The
     // spinner is present for |-moz-appearance:number-input| but also other
     // values such as 'none'.) We need to reframe since we want to use
     // nsTextControlFrame instead of nsNumberControlFrame if the author
     // specifies 'textfield'.
     return nsChangeHint_ReconstructFrame;
   }
   if (mFloats != aOther.mFloats) {
     // Changing which side we float on doesn't affect descendants directly
     NS_UpdateHint(hint,
        NS_SubtractHint(nsChangeHint_AllReflowHints,
                        NS_CombineHint(nsChangeHint_ClearDescendantIntrinsics,
                                       nsChangeHint_NeedDirtyReflow)));
   }
   // XXX the following is conservative, for now: changing float breaking shouldn't
   // necessarily require a repaint, reflow should suffice.
   if (mBreakType != aOther.mBreakType
       || mBreakInside != aOther.mBreakInside
       || mBreakBefore != aOther.mBreakBefore
       || mBreakAfter != aOther.mBreakAfter
       || mAppearance != aOther.mAppearance
       || mOrient != aOther.mOrient
       || mOverflowClipBox != aOther.mOverflowClipBox
       || mClipFlags != aOther.mClipFlags || !mClip.IsEqualInterior(aOther.mClip))
     NS_UpdateHint(hint, NS_CombineHint(nsChangeHint_AllReflowHints,
                                        nsChangeHint_RepaintFrame));
   if (mOpacity != aOther.mOpacity) {
     // If we're going from the optimized >=0.99 opacity value to 1.0 or back, then
     // repaint the frame because DLBI will not catch the invalidation.  Otherwise,
     // just update the opacity layer.
     if ((mOpacity >= 0.99f && mOpacity < 1.0f && aOther.mOpacity == 1.0f) ||
         (aOther.mOpacity >= 0.99f && aOther.mOpacity < 1.0f && mOpacity == 1.0f)) {
       NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
     } else {
       NS_UpdateHint(hint, nsChangeHint_UpdateOpacityLayer);
     }
   }
   /* If we've added or removed the transform property, we need to reconstruct the frame to add
    * or remove the view object, and also to handle abs-pos and fixed-pos containers.
    */
   if (HasTransformStyle() != aOther.HasTransformStyle()) {
     // We do not need to apply nsChangeHint_UpdateTransformLayer since
     // nsChangeHint_RepaintFrame will forcibly invalidate the frame area and
     // ensure layers are rebuilt (or removed).
     NS_UpdateHint(hint, NS_CombineHint(nsChangeHint_AddOrRemoveTransform,
                           NS_CombineHint(nsChangeHint_UpdateOverflow,
                                          nsChangeHint_RepaintFrame)));
   }
   else if (HasTransformStyle()) {
     /* Otherwise, if we've kept the property lying around and we already had a
      * transform, we need to see whether or not we've changed the transform.
      * If so, we need to recompute its overflow rect (which probably changed
      * if the transform changed) and to redraw within the bounds of that new
      * overflow rect.
      */
     if (!mSpecifiedTransform != !aOther.mSpecifiedTransform ||
         (mSpecifiedTransform &&
          *mSpecifiedTransform != *aOther.mSpecifiedTransform)) {
       NS_UpdateHint(hint, NS_CombineHint(nsChangeHint_UpdatePostTransformOverflow,
                                          nsChangeHint_UpdateTransformLayer));
     }
     const nsChangeHint kUpdateOverflowAndRepaintHint =
       NS_CombineHint(nsChangeHint_UpdateOverflow, nsChangeHint_RepaintFrame);
     for (uint8_t index = 0; index < 3; ++index)
       if (mTransformOrigin[index] != aOther.mTransformOrigin[index]) {
         NS_UpdateHint(hint, kUpdateOverflowAndRepaintHint);
         break;
       }
     for (uint8_t index = 0; index < 2; ++index)
       if (mPerspectiveOrigin[index] != aOther.mPerspectiveOrigin[index]) {
         NS_UpdateHint(hint, kUpdateOverflowAndRepaintHint);
         break;
       }
     if (mChildPerspective != aOther.mChildPerspective ||
         mTransformStyle != aOther.mTransformStyle)
       NS_UpdateHint(hint, kUpdateOverflowAndRepaintHint);
     if (mBackfaceVisibility != aOther.mBackfaceVisibility)
       NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
   }
   uint8_t willChangeBitsChanged =
     mWillChangeBitField ^ aOther.mWillChangeBitField;
   if (willChangeBitsChanged & NS_STYLE_WILL_CHANGE_STACKING_CONTEXT) {
     NS_UpdateHint(hint, nsChangeHint_RepaintFrame);
   }
   if (willChangeBitsChanged & ~uint8_t(NS_STYLE_WILL_CHANGE_STACKING_CONTEXT)) {
     // FIXME (Bug 974125): Don't reconstruct the frame
     NS_UpdateHint(hint, nsChangeHint_ReconstructFrame);
   }
   // Note:  Our current behavior for handling changes to the
   // transition-duration, transition-delay, and transition-timing-function
   // properties is to do nothing.  In other words, the transition
   // property that matters is what it is when the transition begins, and
   // we don't stop a transition later because the transition property
   // changed.
   // We do handle changes to transition-property, but we don't need to
   // bother with anything here, since the transition manager is notified
   // of any style context change anyway.
   // Note: Likewise, for animation-*, the animation manager gets
   // notified about every new style context constructed, and it uses
   // that opportunity to handle dynamic changes appropriately.
   return hint;
 }
 // --------------------
 // nsStyleVisibility
 //
 nsStyleVisibility::nsStyleVisibility(nsPresContext* aPresContext)
 {
   MOZ_COUNT_CTOR(nsStyleVisibility);
   uint32_t bidiOptions = aPresContext->GetBidi();
   if (GET_BIDI_OPTION_DIRECTION(bidiOptions) == IBMBIDI_TEXTDIRECTION_RTL)
     mDirection = NS_STYLE_DIRECTION_RTL;
   else
     mDirection = NS_STYLE_DIRECTION_LTR;
   mVisible = NS_STYLE_VISIBILITY_VISIBLE;
   mPointerEvents = NS_STYLE_POINTER_EVENTS_AUTO;
   mWritingMode = NS_STYLE_WRITING_MODE_HORIZONTAL_TB;
 }
 nsStyleVisibility::nsStyleVisibility(const nsStyleVisibility& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleVisibility);
   mImageOrientation = aSource.mImageOrientation;
   mDirection = aSource.mDirection;
   mVisible = aSource.mVisible;
   mPointerEvents = aSource.mPointerEvents;
   mWritingMode = aSource.mWritingMode;
 }
 nsChangeHint nsStyleVisibility::CalcDifference(const nsStyleVisibility& aOther) const
 {
   nsChangeHint hint = nsChangeHint(0);
   if (mDirection != aOther.mDirection || mWritingMode != aOther.mWritingMode) {
     NS_UpdateHint(hint, nsChangeHint_ReconstructFrame);
   } else {
     if ((mImageOrientation != aOther.mImageOrientation)) {
       NS_UpdateHint(hint, nsChangeHint_AllReflowHints);
     }
     if (mVisible != aOther.mVisible) {
       if ((NS_STYLE_VISIBILITY_COLLAPSE == mVisible) ||
           (NS_STYLE_VISIBILITY_COLLAPSE == aOther.mVisible)) {
         NS_UpdateHint(hint, NS_STYLE_HINT_REFLOW);
       } else {
         NS_UpdateHint(hint, NS_STYLE_HINT_VISUAL);
       }
     }
     if (mPointerEvents != aOther.mPointerEvents) {
       // nsSVGPathGeometryFrame's mRect depends on stroke _and_ on the value
       // of pointer-events. See nsSVGPathGeometryFrame::ReflowSVG's use of
       // GetHitTestFlags. (Only a reflow, no visual change.)
       NS_UpdateHint(hint, nsChangeHint_NeedReflow);
       NS_UpdateHint(hint, nsChangeHint_NeedDirtyReflow); // XXX remove me: bug 876085
     }
   }
   return hint;
 }
 nsStyleContentData::~nsStyleContentData()
 {
   NS_ABORT_IF_FALSE(!mImageTracked,
                     "nsStyleContentData being destroyed while still tracking image!");
   if (mType == eStyleContentType_Image) {
     NS_IF_RELEASE(mContent.mImage);
   } else if (mType == eStyleContentType_Counter ||
              mType == eStyleContentType_Counters) {
     mContent.mCounters->Release();
   } else if (mContent.mString) {
     NS_Free(mContent.mString);
   }
 }
 nsStyleContentData& nsStyleContentData::operator=(const nsStyleContentData& aOther)
 {
   if (this == &aOther)
     return *this;
   this->~nsStyleContentData();
   new (this) nsStyleContentData();
   mType = aOther.mType;
   if (mType == eStyleContentType_Image) {
     mContent.mImage = aOther.mContent.mImage;
     NS_IF_ADDREF(mContent.mImage);
   } else if (mType == eStyleContentType_Counter ||
              mType == eStyleContentType_Counters) {
     mContent.mCounters = aOther.mContent.mCounters;
     mContent.mCounters->AddRef();
   } else if (aOther.mContent.mString) {
     mContent.mString = NS_strdup(aOther.mContent.mString);
   } else {
     mContent.mString = nullptr;
   }
   return *this;
 }
 bool nsStyleContentData::operator==(const nsStyleContentData& aOther) const
 {
   if (mType != aOther.mType)
     return false;
   if (mType == eStyleContentType_Image) {
     if (!mContent.mImage || !aOther.mContent.mImage)
       return mContent.mImage == aOther.mContent.mImage;
     bool eq;
     nsCOMPtr<nsIURI> thisURI, otherURI;
     mContent.mImage->GetURI(getter_AddRefs(thisURI));
     aOther.mContent.mImage->GetURI(getter_AddRefs(otherURI));
     return thisURI == otherURI ||  // handles null==null
            (thisURI && otherURI &&
             NS_SUCCEEDED(thisURI->Equals(otherURI, &eq)) &&
             eq);
   }
   if (mType == eStyleContentType_Counter ||
       mType == eStyleContentType_Counters)
     return *mContent.mCounters == *aOther.mContent.mCounters;
   return safe_strcmp(mContent.mString, aOther.mContent.mString) == 0;
 }
 void
 nsStyleContentData::TrackImage(nsPresContext* aContext)
 {
   // Sanity
   NS_ABORT_IF_FALSE(!mImageTracked, "Already tracking image!");
   NS_ABORT_IF_FALSE(mType == eStyleContentType_Image,
                     "Trying to do image tracking on non-image!");
   NS_ABORT_IF_FALSE(mContent.mImage,
                     "Can't track image when there isn't one!");
   // Register the image with the document
   nsIDocument* doc = aContext->Document();
   if (doc)
     doc->AddImage(mContent.mImage);
   // Mark state
 #ifdef DEBUG
   mImageTracked = true;
 #endif
 }
 void
 nsStyleContentData::UntrackImage(nsPresContext* aContext)
 {
   // Sanity
   NS_ABORT_IF_FALSE(mImageTracked, "Image not tracked!");
   NS_ABORT_IF_FALSE(mType == eStyleContentType_Image,
                     "Trying to do image tracking on non-image!");
   NS_ABORT_IF_FALSE(mContent.mImage,
                     "Can't untrack image when there isn't one!");
   // Unregister the image with the document
   nsIDocument* doc = aContext->Document();
   if (doc)
     doc->RemoveImage(mContent.mImage, nsIDocument::REQUEST_DISCARD);
   // Mark state
 #ifdef DEBUG
   mImageTracked = false;
 #endif
 }
 //-----------------------
 // nsStyleContent
 //
 nsStyleContent::nsStyleContent(void)
   : mMarkerOffset(),
     mContents(nullptr),
     mIncrements(nullptr),
     mResets(nullptr),
     mContentCount(0),
     mIncrementCount(0),
     mResetCount(0)
 {
   MOZ_COUNT_CTOR(nsStyleContent);
   mMarkerOffset.SetAutoValue();
 }
 nsStyleContent::~nsStyleContent(void)
 {
   MOZ_COUNT_DTOR(nsStyleContent);
   DELETE_ARRAY_IF(mContents);
   DELETE_ARRAY_IF(mIncrements);
   DELETE_ARRAY_IF(mResets);
 }
 void
 nsStyleContent::Destroy(nsPresContext* aContext)
 {
   // Unregister any images we might have with the document.
   for (uint32_t i = 0; i < mContentCount; ++i) {
     if ((mContents[i].mType == eStyleContentType_Image) &&
         mContents[i].mContent.mImage) {
       mContents[i].UntrackImage(aContext);
     }
   }
   this->~nsStyleContent();
   aContext->FreeToShell(sizeof(nsStyleContent), this);
 }
 nsStyleContent::nsStyleContent(const nsStyleContent& aSource)
    :mMarkerOffset(),
     mContents(nullptr),
     mIncrements(nullptr),
     mResets(nullptr),
     mContentCount(0),
     mIncrementCount(0),
     mResetCount(0)
 {
   MOZ_COUNT_CTOR(nsStyleContent);
   mMarkerOffset = aSource.mMarkerOffset;
   uint32_t index;
   if (NS_SUCCEEDED(AllocateContents(aSource.ContentCount()))) {
     for (index = 0; index < mContentCount; index++) {
       ContentAt(index) = aSource.ContentAt(index);
     }
   }
   if (NS_SUCCEEDED(AllocateCounterIncrements(aSource.CounterIncrementCount()))) {
     for (index = 0; index < mIncrementCount; index++) {
       const nsStyleCounterData *data = aSource.GetCounterIncrementAt(index);
       mIncrements[index].mCounter = data->mCounter;
       mIncrements[index].mValue = data->mValue;
     }
   }
   if (NS_SUCCEEDED(AllocateCounterResets(aSource.CounterResetCount()))) {
     for (index = 0; index < mResetCount; index++) {
       const nsStyleCounterData *data = aSource.GetCounterResetAt(index);
       mResets[index].mCounter = data->mCounter;
       mResets[index].mValue = data->mValue;
     }
   }
 }
 nsChangeHint nsStyleContent::CalcDifference(const nsStyleContent& aOther) const
 {
   // In ReResolveStyleContext we assume that if there's no existing
   // ::before or ::after and we don't have to restyle children of the
   // node then we can't end up with a ::before or ::after due to the
   // restyle of the node itself.  That's not quite true, but the only
   // exception to the above is when the 'content' property of the node
   // changes and the pseudo-element inherits the changed value.  Since
   // the code here triggers a frame change on the node in that case,
   // the optimization in ReResolveStyleContext is ok.  But if we ever
   // change this code to not reconstruct frames on changes to the
   // 'content' property, then we will need to revisit the optimization
   // in ReResolveStyleContext.
   if (mContentCount != aOther.mContentCount ||
       mIncrementCount != aOther.mIncrementCount ||
       mResetCount != aOther.mResetCount) {
     return NS_STYLE_HINT_FRAMECHANGE;
   }
   uint32_t ix = mContentCount;
   while (0 < ix--) {
     if (mContents[ix] != aOther.mContents[ix]) {
       // Unfortunately we need to reframe here; a simple reflow
       // will not pick up different text or different image URLs,
       // since we set all that up in the CSSFrameConstructor
       return NS_STYLE_HINT_FRAMECHANGE;
     }
   }
   ix = mIncrementCount;
   while (0 < ix--) {
     if ((mIncrements[ix].mValue != aOther.mIncrements[ix].mValue) ||
         (mIncrements[ix].mCounter != aOther.mIncrements[ix].mCounter)) {
       return NS_STYLE_HINT_FRAMECHANGE;
     }
   }
   ix = mResetCount;
   while (0 < ix--) {
     if ((mResets[ix].mValue != aOther.mResets[ix].mValue) ||
         (mResets[ix].mCounter != aOther.mResets[ix].mCounter)) {
       return NS_STYLE_HINT_FRAMECHANGE;
     }
   }
   if (mMarkerOffset != aOther.mMarkerOffset) {
     return NS_STYLE_HINT_REFLOW;
   }
   return NS_STYLE_HINT_NONE;
 }
 nsresult nsStyleContent::AllocateContents(uint32_t aCount)
 {
   // We need to run the destructors of the elements of mContents, so we
   // delete and reallocate even if aCount == mContentCount.  (If
   // nsStyleContentData had its members private and managed their
   // ownership on setting, we wouldn't need this, but that seems
   // unnecessary at this point.)
   DELETE_ARRAY_IF(mContents);
   if (aCount) {
     mContents = new nsStyleContentData[aCount];
     if (! mContents) {
       mContentCount = 0;
       return NS_ERROR_OUT_OF_MEMORY;
     }
   }
   mContentCount = aCount;
   return NS_OK;
 }
 // ---------------------
 // nsStyleQuotes
 //
 nsStyleQuotes::nsStyleQuotes(void)
   : mQuotesCount(0),
     mQuotes(nullptr)
 {
   MOZ_COUNT_CTOR(nsStyleQuotes);
   SetInitial();
 }
 nsStyleQuotes::~nsStyleQuotes(void)
 {
   MOZ_COUNT_DTOR(nsStyleQuotes);
   DELETE_ARRAY_IF(mQuotes);
 }
 nsStyleQuotes::nsStyleQuotes(const nsStyleQuotes& aSource)
   : mQuotesCount(0),
     mQuotes(nullptr)
 {
   MOZ_COUNT_CTOR(nsStyleQuotes);
   CopyFrom(aSource);
 }
 void
 nsStyleQuotes::SetInitial()
 {
   // 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] = {
 x201C, 0, 0x201D, 0, 0x2018, 0, 0x2019, 0
   };
   if (NS_SUCCEEDED(AllocateQuotes(2))) {
     SetQuotesAt(0,
                 nsDependentString(&initialQuotes[0], 1),
                 nsDependentString(&initialQuotes[2], 1));
     SetQuotesAt(1,
                 nsDependentString(&initialQuotes[4], 1),
                 nsDependentString(&initialQuotes[6], 1));
   }
 }
 void
 nsStyleQuotes::CopyFrom(const nsStyleQuotes& aSource)
 {
   if (NS_SUCCEEDED(AllocateQuotes(aSource.QuotesCount()))) {
     uint32_t count = (mQuotesCount * 2);
     for (uint32_t index = 0; index < count; index += 2) {
       aSource.GetQuotesAt(index, mQuotes[index], mQuotes[index + 1]);
     }
   }
 }
 nsChangeHint nsStyleQuotes::CalcDifference(const nsStyleQuotes& aOther) 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 (mQuotesCount == aOther.mQuotesCount) {
     uint32_t ix = (mQuotesCount * 2);
     while (0 < ix--) {
       if (mQuotes[ix] != aOther.mQuotes[ix]) {
         return NS_STYLE_HINT_FRAMECHANGE;
       }
     }
     return NS_STYLE_HINT_NONE;
   }
   return NS_STYLE_HINT_FRAMECHANGE;
 }
 // --------------------
 // nsStyleTextReset
 //
 nsStyleTextReset::nsStyleTextReset(void)
 {
   MOZ_COUNT_CTOR(nsStyleTextReset);
   mVerticalAlign.SetIntValue(NS_STYLE_VERTICAL_ALIGN_BASELINE, eStyleUnit_Enumerated);
   mTextDecorationLine = NS_STYLE_TEXT_DECORATION_LINE_NONE;
   mTextDecorationColor = NS_RGB(0,0,0);
   mTextDecorationStyle =
     NS_STYLE_TEXT_DECORATION_STYLE_SOLID | BORDER_COLOR_FOREGROUND;
   mUnicodeBidi = NS_STYLE_UNICODE_BIDI_NORMAL;
 }
 nsStyleTextReset::nsStyleTextReset(const nsStyleTextReset& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleTextReset);
   *this = aSource;
 }
 nsStyleTextReset::~nsStyleTextReset(void)
 {
   MOZ_COUNT_DTOR(nsStyleTextReset);
 }
 nsChangeHint nsStyleTextReset::CalcDifference(const nsStyleTextReset& aOther) const
 {
   if (mVerticalAlign == aOther.mVerticalAlign
       && mUnicodeBidi == aOther.mUnicodeBidi) {
     uint8_t lineStyle = GetDecorationStyle();
     uint8_t otherLineStyle = aOther.GetDecorationStyle();
     if (mTextDecorationLine != aOther.mTextDecorationLine ||
         lineStyle != otherLineStyle) {
       // Reflow for decoration line style changes only to or from double or
       // wave because that may cause overflow area changes
       if (lineStyle == NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE ||
           lineStyle == NS_STYLE_TEXT_DECORATION_STYLE_WAVY ||
           otherLineStyle == NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE ||
           otherLineStyle == NS_STYLE_TEXT_DECORATION_STYLE_WAVY) {
         return NS_STYLE_HINT_REFLOW;
       }
       // Repaint for other style decoration lines because they must be in
       // default overflow rect
       return NS_STYLE_HINT_VISUAL;
     }
     // Repaint for decoration color changes
     nscolor decColor, otherDecColor;
     bool isFG, otherIsFG;
     GetDecorationColor(decColor, isFG);
     aOther.GetDecorationColor(otherDecColor, otherIsFG);
     if (isFG != otherIsFG || (!isFG && decColor != otherDecColor)) {
       return NS_STYLE_HINT_VISUAL;
     }
     if (mTextOverflow != aOther.mTextOverflow) {
       return NS_STYLE_HINT_VISUAL;
     }
     return NS_STYLE_HINT_NONE;
   }
   return NS_STYLE_HINT_REFLOW;
 }
 // Allowed to return one of NS_STYLE_HINT_NONE, NS_STYLE_HINT_REFLOW
 // or NS_STYLE_HINT_VISUAL. Currently we just return NONE or REFLOW, though.
 // XXXbz can this not return a more specific hint?  If that's ever
 // changed, nsStyleBorder::CalcDifference will need changing too.
 static nsChangeHint
 CalcShadowDifference(nsCSSShadowArray* lhs,
                      nsCSSShadowArray* rhs)
 {
   if (lhs == rhs)
     return NS_STYLE_HINT_NONE;
   if (!lhs || !rhs || lhs->Length() != rhs->Length())
     return NS_STYLE_HINT_REFLOW;
   for (uint32_t i = 0; i < lhs->Length(); ++i) {
     if (*lhs->ShadowAt(i) != *rhs->ShadowAt(i))
       return NS_STYLE_HINT_REFLOW;
   }
   return NS_STYLE_HINT_NONE;
 }
 // --------------------
 // nsStyleText
 //
 nsStyleText::nsStyleText(void)
 {
   MOZ_COUNT_CTOR(nsStyleText);
   mTextAlign = NS_STYLE_TEXT_ALIGN_DEFAULT;
   mTextAlignLast = NS_STYLE_TEXT_ALIGN_AUTO;
   mTextAlignTrue = false;
   mTextAlignLastTrue = false;
   mTextTransform = NS_STYLE_TEXT_TRANSFORM_NONE;
   mWhiteSpace = NS_STYLE_WHITESPACE_NORMAL;
   mWordBreak = NS_STYLE_WORDBREAK_NORMAL;
   mWordWrap = NS_STYLE_WORDWRAP_NORMAL;
   mHyphens = NS_STYLE_HYPHENS_MANUAL;
   mTextSizeAdjust = NS_STYLE_TEXT_SIZE_ADJUST_AUTO;
   mTextOrientation = NS_STYLE_TEXT_ORIENTATION_AUTO;
   mTextCombineUpright = NS_STYLE_TEXT_COMBINE_UPRIGHT_NONE;
   mControlCharacterVisibility = NS_STYLE_CONTROL_CHARACTER_VISIBILITY_HIDDEN;
   mLetterSpacing.SetNormalValue();
   mLineHeight.SetNormalValue();
   mTextIndent.SetCoordValue(0);
   mWordSpacing = 0;
   mTextShadow = nullptr;
   mTabSize = NS_STYLE_TABSIZE_INITIAL;
 }
 nsStyleText::nsStyleText(const nsStyleText& aSource)
   : mTextAlign(aSource.mTextAlign),
     mTextAlignLast(aSource.mTextAlignLast),
     mTextAlignTrue(false),
     mTextAlignLastTrue(false),
     mTextTransform(aSource.mTextTransform),
     mWhiteSpace(aSource.mWhiteSpace),
     mWordBreak(aSource.mWordBreak),
     mWordWrap(aSource.mWordWrap),
     mHyphens(aSource.mHyphens),
     mTextSizeAdjust(aSource.mTextSizeAdjust),
     mTextOrientation(aSource.mTextOrientation),
     mTextCombineUpright(aSource.mTextCombineUpright),
     mControlCharacterVisibility(aSource.mControlCharacterVisibility),
     mTabSize(aSource.mTabSize),
     mWordSpacing(aSource.mWordSpacing),
     mLetterSpacing(aSource.mLetterSpacing),
     mLineHeight(aSource.mLineHeight),
     mTextIndent(aSource.mTextIndent),
     mTextShadow(aSource.mTextShadow)
 {
   MOZ_COUNT_CTOR(nsStyleText);
 }
 nsStyleText::~nsStyleText(void)
 {
   MOZ_COUNT_DTOR(nsStyleText);
 }
 nsChangeHint nsStyleText::CalcDifference(const nsStyleText& aOther) const
 {
   if (WhiteSpaceOrNewlineIsSignificant() !=
       aOther.WhiteSpaceOrNewlineIsSignificant()) {
     // This may require construction of suppressed text frames
     return NS_STYLE_HINT_FRAMECHANGE;
   }
   if (mTextCombineUpright != aOther.mTextCombineUpright ||
       mControlCharacterVisibility != aOther.mControlCharacterVisibility) {
     return nsChangeHint_ReconstructFrame;
   }
   if ((mTextAlign != aOther.mTextAlign) ||
       (mTextAlignLast != aOther.mTextAlignLast) ||
       (mTextAlignTrue != aOther.mTextAlignTrue) ||
       (mTextAlignLastTrue != aOther.mTextAlignLastTrue) ||
       (mTextTransform != aOther.mTextTransform) ||
       (mWhiteSpace != aOther.mWhiteSpace) ||
       (mWordBreak != aOther.mWordBreak) ||
       (mWordWrap != aOther.mWordWrap) ||
       (mHyphens != aOther.mHyphens) ||
       (mTextSizeAdjust != aOther.mTextSizeAdjust) ||
       (mTextOrientation != aOther.mTextOrientation) ||
       (mLetterSpacing != aOther.mLetterSpacing) ||
       (mLineHeight != aOther.mLineHeight) ||
       (mTextIndent != aOther.mTextIndent) ||
       (mWordSpacing != aOther.mWordSpacing) ||
       (mTabSize != aOther.mTabSize))
     return NS_STYLE_HINT_REFLOW;
   return CalcShadowDifference(mTextShadow, aOther.mTextShadow);
 }
 //-----------------------
 // nsStyleUserInterface
 //
 nsCursorImage::nsCursorImage()
   : mHaveHotspot(false)
   , mHotspotX(0.0f)
   , mHotspotY(0.0f)
 {
 }
 nsCursorImage::nsCursorImage(const nsCursorImage& aOther)
   : mHaveHotspot(aOther.mHaveHotspot)
   , mHotspotX(aOther.mHotspotX)
   , mHotspotY(aOther.mHotspotY)
 {
   SetImage(aOther.GetImage());
 }
 nsCursorImage::~nsCursorImage()
 {
   SetImage(nullptr);
 }
 nsCursorImage&
 nsCursorImage::operator=(const nsCursorImage& aOther)
 {
   if (this != &aOther) {
     mHaveHotspot = aOther.mHaveHotspot;
     mHotspotX = aOther.mHotspotX;
     mHotspotY = aOther.mHotspotY;
     SetImage(aOther.GetImage());
   }
   return *this;
 }
 nsStyleUserInterface::nsStyleUserInterface(void)
 {
   MOZ_COUNT_CTOR(nsStyleUserInterface);
   mUserInput = NS_STYLE_USER_INPUT_AUTO;
   mUserModify = NS_STYLE_USER_MODIFY_READ_ONLY;
   mUserFocus = NS_STYLE_USER_FOCUS_NONE;
   mCursor = NS_STYLE_CURSOR_AUTO; // fix for bugzilla bug 51113
   mCursorArrayLength = 0;
   mCursorArray = nullptr;
 }
 nsStyleUserInterface::nsStyleUserInterface(const nsStyleUserInterface& aSource) :
   mUserInput(aSource.mUserInput),
   mUserModify(aSource.mUserModify),
   mUserFocus(aSource.mUserFocus),
   mCursor(aSource.mCursor)
 {
   MOZ_COUNT_CTOR(nsStyleUserInterface);
   CopyCursorArrayFrom(aSource);
 }
 nsStyleUserInterface::~nsStyleUserInterface(void)
 {
   MOZ_COUNT_DTOR(nsStyleUserInterface);
   delete [] mCursorArray;
 }
 nsChangeHint nsStyleUserInterface::CalcDifference(const nsStyleUserInterface& aOther) const
 {
   nsChangeHint hint = nsChangeHint(0);
   if (mCursor != aOther.mCursor)
     NS_UpdateHint(hint, nsChangeHint_UpdateCursor);
   // We could do better. But it wouldn't be worth it, URL-specified cursors are
   // rare.
   if (mCursorArrayLength > 0 || aOther.mCursorArrayLength > 0)
     NS_UpdateHint(hint, nsChangeHint_UpdateCursor);
   if (mUserModify != aOther.mUserModify)
     NS_UpdateHint(hint, NS_STYLE_HINT_VISUAL);
   if ((mUserInput != aOther.mUserInput) &&
       ((NS_STYLE_USER_INPUT_NONE == mUserInput) ||
        (NS_STYLE_USER_INPUT_NONE == aOther.mUserInput))) {
     NS_UpdateHint(hint, NS_STYLE_HINT_FRAMECHANGE);
   }
   // ignore mUserFocus
   return hint;
 }
 void
 nsStyleUserInterface::CopyCursorArrayFrom(const nsStyleUserInterface& aSource)
 {
   mCursorArray = nullptr;
   mCursorArrayLength = 0;
   if (aSource.mCursorArrayLength) {
     mCursorArray = new nsCursorImage[aSource.mCursorArrayLength];
     if (mCursorArray) {
       mCursorArrayLength = aSource.mCursorArrayLength;
       for (uint32_t i = 0; i < mCursorArrayLength; ++i)
         mCursorArray[i] = aSource.mCursorArray[i];
     }
   }
 }
 //-----------------------
 // nsStyleUIReset
 //
 nsStyleUIReset::nsStyleUIReset(void)
 {
   MOZ_COUNT_CTOR(nsStyleUIReset);
   mUserSelect = NS_STYLE_USER_SELECT_AUTO;
   mForceBrokenImageIcon = 0;
   mIMEMode = NS_STYLE_IME_MODE_AUTO;
   mWindowShadow = NS_STYLE_WINDOW_SHADOW_DEFAULT;
 }
 nsStyleUIReset::nsStyleUIReset(const nsStyleUIReset& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleUIReset);
   mUserSelect = aSource.mUserSelect;
   mForceBrokenImageIcon = aSource.mForceBrokenImageIcon;
   mIMEMode = aSource.mIMEMode;
   mWindowShadow = aSource.mWindowShadow;
 }
 nsStyleUIReset::~nsStyleUIReset(void)
 {
   MOZ_COUNT_DTOR(nsStyleUIReset);
 }
 nsChangeHint nsStyleUIReset::CalcDifference(const nsStyleUIReset& aOther) const
 {
   // ignore mIMEMode
   if (mForceBrokenImageIcon != aOther.mForceBrokenImageIcon)
     return NS_STYLE_HINT_FRAMECHANGE;
   if (mWindowShadow != aOther.mWindowShadow) {
     // We really need just an nsChangeHint_SyncFrameView, except
     // on an ancestor of the frame, so we get that by doing a
     // reflow.
     return NS_STYLE_HINT_REFLOW;
   }
   if (mUserSelect != aOther.mUserSelect)
     return NS_STYLE_HINT_VISUAL;
   return NS_STYLE_HINT_NONE;
 }
 //-----------------------
 // nsStyleVariables
 //
 nsStyleVariables::nsStyleVariables()
 {
   MOZ_COUNT_CTOR(nsStyleVariables);
 }
 nsStyleVariables::nsStyleVariables(const nsStyleVariables& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleVariables);
 }
 nsStyleVariables::~nsStyleVariables(void)
 {
   MOZ_COUNT_DTOR(nsStyleVariables);
 }
 nsChangeHint
 nsStyleVariables::CalcDifference(const nsStyleVariables& aOther) const
 {
   return nsChangeHint(0);
 }

The Tor Browser / annotate

layout/style/nsStyleStruct.cpp@97036ab72558 (annotated)

layout/style/nsStyleStruct.cpp