Source/core/rendering/style/RenderStyle.cpp

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
defaultStyle
create
createDefaultStyle
createAnonymousStyleWithDisplay
clone
m_svgStyle
noninherited_flags
diffPseudoStyles
stylePropagationDiff
inheritFrom
copyNonInheritedFrom
isStyleAvailable
hasUniquePseudoStyle
getCachedPseudoStyle
addCachedPseudoStyle
removeCachedPseudoStyle
inheritedNotEqual
inheritedDataShared
positionedObjectMovedOnly
visualInvalidationDiff
repaintOnlyDiff
setClip
addCursor
setCursorList
setQuotes
clearCursorList
addCallbackSelector
clearContent
appendContent
setContent
setContent
setContent
setContent
blendMode
setBlendMode
hasBlendMode
isolation
setIsolation
hasIsolation
hasWillChangeCompositingHint
hasWillChangeGpuRasterizationHint
requireTransformOrigin
applyTransform
applyTransform
setTextShadow
setBoxShadow
calcRadiiFor
listStyleImage
setListStyleImage
color
visitedLinkColor
setColor
setVisitedLinkColor
horizontalBorderSpacing
verticalBorderSpacing
setHorizontalBorderSpacing
setVerticalBorderSpacing
getRoundedBorderFor
getRoundedInnerBorderFor
getRoundedInnerBorderFor
allLayersAreFixed
hasEntirelyFixedBackground
counterDirectives
accessCounterDirectives
getCounterDirectives
hyphenString
textEmphasisMarkString
adjustAnimations
adjustTransitions
accessAnimations
accessTransitions
transitionForProperty
font
fontMetrics
fontDescription
specifiedFontSize
computedFontSize
fontSize
fontWeight
wordSpacing
letterSpacing
setFontDescription
specifiedLineHeight
lineHeight
setLineHeight
computedLineHeight
setWordSpacing
setLetterSpacing
setFontSize
setFontWeight
getShadowExtent
getShadowInsetExtent
getShadowHorizontalExtent
getShadowVerticalExtent
visitedDependentDecorationColor
colorIncludingFallback
visitedDependentColor
borderBefore
borderAfter
borderStart
borderEnd
borderBeforeWidth
borderAfterWidth
borderStartWidth
borderEndWidth
setMarginStart
setMarginEnd
textEmphasisMark
initialTapHighlightColor
imageOutsets
setBorderImageSource
setBorderImageSlices
setBorderImageWidth
setBorderImageOutset
calcBorderRadiiConstraintScaleFor
/*
 * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
 * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "core/rendering/style/RenderStyle.h"

#include <algorithm>
#include "RuntimeEnabledFeatures.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/rendering/RenderTheme.h"
#include "core/rendering/TextAutosizer.h"
#include "core/rendering/style/ContentData.h"
#include "core/rendering/style/CursorList.h"
#include "core/rendering/style/QuotesData.h"
#include "core/rendering/style/ShadowList.h"
#include "core/rendering/style/StyleImage.h"
#include "core/rendering/style/StyleInheritedData.h"
#include "platform/LengthFunctions.h"
#include "platform/fonts/Font.h"
#include "platform/fonts/FontSelector.h"
#include "platform/geometry/FloatRoundedRect.h"
#include "wtf/MathExtras.h"

using namespace std;

namespace WebCore {

struct SameSizeAsBorderValue {
    RGBA32 m_color;
    unsigned m_width;
};

COMPILE_ASSERT(sizeof(BorderValue) == sizeof(SameSizeAsBorderValue), BorderValue_should_not_grow);

struct SameSizeAsRenderStyle : public RefCounted<SameSizeAsRenderStyle> {
    void* dataRefs[7];
    void* ownPtrs[1];
    void* dataRefSvgStyle;

    struct InheritedFlags {
        unsigned m_bitfields[2];
    } inherited_flags;

    struct NonInheritedFlags {
        unsigned m_bitfields[2];
    } noninherited_flags;
};

COMPILE_ASSERT(sizeof(RenderStyle) == sizeof(SameSizeAsRenderStyle), RenderStyle_should_stay_small);

inline RenderStyle* defaultStyle()
{
    DEFINE_STATIC_REF(RenderStyle, s_defaultStyle, (RenderStyle::createDefaultStyle()));
    return s_defaultStyle;
}

PassRefPtr<RenderStyle> RenderStyle::create()
{
    return adoptRef(new RenderStyle());
}

PassRefPtr<RenderStyle> RenderStyle::createDefaultStyle()
{
    return adoptRef(new RenderStyle(DefaultStyle));
}

PassRefPtr<RenderStyle> RenderStyle::createAnonymousStyleWithDisplay(const RenderStyle* parentStyle, EDisplay display)
{
    RefPtr<RenderStyle> newStyle = RenderStyle::create();
    newStyle->inheritFrom(parentStyle);
    newStyle->inheritUnicodeBidiFrom(parentStyle);
    newStyle->setDisplay(display);
    return newStyle;
}

PassRefPtr<RenderStyle> RenderStyle::clone(const RenderStyle* other)
{
    return adoptRef(new RenderStyle(*other));
}

ALWAYS_INLINE RenderStyle::RenderStyle()
    : m_box(defaultStyle()->m_box)
    , visual(defaultStyle()->visual)
    , m_background(defaultStyle()->m_background)
    , surround(defaultStyle()->surround)
    , rareNonInheritedData(defaultStyle()->rareNonInheritedData)
    , rareInheritedData(defaultStyle()->rareInheritedData)
    , inherited(defaultStyle()->inherited)
    , m_svgStyle(defaultStyle()->m_svgStyle)
{
    setBitDefaults(); // Would it be faster to copy this from the default style?
    COMPILE_ASSERT((sizeof(InheritedFlags) <= 8), InheritedFlags_does_not_grow);
    COMPILE_ASSERT((sizeof(NonInheritedFlags) <= 8), NonInheritedFlags_does_not_grow);
}

ALWAYS_INLINE RenderStyle::RenderStyle(DefaultStyleTag)
{
    setBitDefaults();

    m_box.init();
    visual.init();
    m_background.init();
    surround.init();
    rareNonInheritedData.init();
    rareNonInheritedData.access()->m_deprecatedFlexibleBox.init();
    rareNonInheritedData.access()->m_flexibleBox.init();
    rareNonInheritedData.access()->m_marquee.init();
    rareNonInheritedData.access()->m_multiCol.init();
    rareNonInheritedData.access()->m_transform.init();
    rareNonInheritedData.access()->m_willChange.init();
    rareNonInheritedData.access()->m_filter.init();
    rareNonInheritedData.access()->m_grid.init();
    rareNonInheritedData.access()->m_gridItem.init();
    rareInheritedData.init();
    inherited.init();
    m_svgStyle.init();
}

ALWAYS_INLINE RenderStyle::RenderStyle(const RenderStyle& o)
    : RefCounted<RenderStyle>()
    , m_box(o.m_box)
    , visual(o.visual)
    , m_background(o.m_background)
    , surround(o.surround)
    , rareNonInheritedData(o.rareNonInheritedData)
    , rareInheritedData(o.rareInheritedData)
    , inherited(o.inherited)
    , m_svgStyle(o.m_svgStyle)
    , inherited_flags(o.inherited_flags)
    , noninherited_flags(o.noninherited_flags)
{
}

static StyleRecalcChange diffPseudoStyles(const RenderStyle* oldStyle, const RenderStyle* newStyle)
{
    // If the pseudoStyles have changed, we want any StyleRecalcChange that is not NoChange
    // because setStyle will do the right thing with anything else.
    if (!oldStyle->hasAnyPublicPseudoStyles())
        return NoChange;
    for (PseudoId pseudoId = FIRST_PUBLIC_PSEUDOID; pseudoId < FIRST_INTERNAL_PSEUDOID; pseudoId = static_cast<PseudoId>(pseudoId + 1)) {
        if (!oldStyle->hasPseudoStyle(pseudoId))
            continue;
        RenderStyle* newPseudoStyle = newStyle->getCachedPseudoStyle(pseudoId);
        if (!newPseudoStyle)
            return NoInherit;
        RenderStyle* oldPseudoStyle = oldStyle->getCachedPseudoStyle(pseudoId);
        if (oldPseudoStyle && *oldPseudoStyle != *newPseudoStyle)
            return NoInherit;
    }
    return NoChange;
}

StyleRecalcChange RenderStyle::stylePropagationDiff(const RenderStyle* oldStyle, const RenderStyle* newStyle)
{
    if ((!oldStyle && newStyle) || (oldStyle && !newStyle))
        return Reattach;

    if (!oldStyle && !newStyle)
        return NoChange;

    if (oldStyle->display() != newStyle->display()
        || oldStyle->hasPseudoStyle(FIRST_LETTER) != newStyle->hasPseudoStyle(FIRST_LETTER)
        || oldStyle->columnSpan() != newStyle->columnSpan()
        || oldStyle->specifiesColumns() != newStyle->specifiesColumns()
        || !oldStyle->contentDataEquivalent(newStyle)
        || oldStyle->hasTextCombine() != newStyle->hasTextCombine())
        return Reattach;

    if (*oldStyle == *newStyle)
        return diffPseudoStyles(oldStyle, newStyle);

    if (oldStyle->inheritedNotEqual(newStyle)
        || oldStyle->hasExplicitlyInheritedProperties()
        || newStyle->hasExplicitlyInheritedProperties())
        return Inherit;

    return NoInherit;
}

void RenderStyle::inheritFrom(const RenderStyle* inheritParent, IsAtShadowBoundary isAtShadowBoundary)
{
    if (isAtShadowBoundary == AtShadowBoundary) {
        // Even if surrounding content is user-editable, shadow DOM should act as a single unit, and not necessarily be editable
        EUserModify currentUserModify = userModify();
        rareInheritedData = inheritParent->rareInheritedData;
        setUserModify(currentUserModify);
    } else
        rareInheritedData = inheritParent->rareInheritedData;
    inherited = inheritParent->inherited;
    inherited_flags = inheritParent->inherited_flags;
    if (m_svgStyle != inheritParent->m_svgStyle)
        m_svgStyle.access()->inheritFrom(inheritParent->m_svgStyle.get());
}

void RenderStyle::copyNonInheritedFrom(const RenderStyle* other)
{
    m_box = other->m_box;
    visual = other->visual;
    m_background = other->m_background;
    surround = other->surround;
    rareNonInheritedData = other->rareNonInheritedData;
    // The flags are copied one-by-one because noninherited_flags contains a bunch of stuff other than real style data.
    noninherited_flags._effectiveDisplay = other->noninherited_flags._effectiveDisplay;
    noninherited_flags._originalDisplay = other->noninherited_flags._originalDisplay;
    noninherited_flags._overflowX = other->noninherited_flags._overflowX;
    noninherited_flags._overflowY = other->noninherited_flags._overflowY;
    noninherited_flags._vertical_align = other->noninherited_flags._vertical_align;
    noninherited_flags._clear = other->noninherited_flags._clear;
    noninherited_flags._position = other->noninherited_flags._position;
    noninherited_flags._floating = other->noninherited_flags._floating;
    noninherited_flags._table_layout = other->noninherited_flags._table_layout;
    noninherited_flags._unicodeBidi = other->noninherited_flags._unicodeBidi;
    noninherited_flags._page_break_before = other->noninherited_flags._page_break_before;
    noninherited_flags._page_break_after = other->noninherited_flags._page_break_after;
    noninherited_flags._page_break_inside = other->noninherited_flags._page_break_inside;
    noninherited_flags.explicitInheritance = other->noninherited_flags.explicitInheritance;
    noninherited_flags.currentColor = other->noninherited_flags.currentColor;
    noninherited_flags.hasViewportUnits = other->noninherited_flags.hasViewportUnits;
    if (m_svgStyle != other->m_svgStyle)
        m_svgStyle.access()->copyNonInheritedFrom(other->m_svgStyle.get());
    ASSERT(zoom() == initialZoom());
}

bool RenderStyle::operator==(const RenderStyle& o) const
{
    // compare everything except the pseudoStyle pointer
    return inherited_flags == o.inherited_flags
        && noninherited_flags == o.noninherited_flags
        && m_box == o.m_box
        && visual == o.visual
        && m_background == o.m_background
        && surround == o.surround
        && rareNonInheritedData == o.rareNonInheritedData
        && rareInheritedData == o.rareInheritedData
        && inherited == o.inherited
        && m_svgStyle == o.m_svgStyle;
}

bool RenderStyle::isStyleAvailable() const
{
    return this != StyleResolver::styleNotYetAvailable();
}

bool RenderStyle::hasUniquePseudoStyle() const
{
    if (!m_cachedPseudoStyles || styleType() != NOPSEUDO)
        return false;

    for (size_t i = 0; i < m_cachedPseudoStyles->size(); ++i) {
        RenderStyle* pseudoStyle = m_cachedPseudoStyles->at(i).get();
        if (pseudoStyle->unique())
            return true;
    }

    return false;
}

RenderStyle* RenderStyle::getCachedPseudoStyle(PseudoId pid) const
{
    if (!m_cachedPseudoStyles || !m_cachedPseudoStyles->size())
        return 0;

    if (styleType() != NOPSEUDO)
        return 0;

    for (size_t i = 0; i < m_cachedPseudoStyles->size(); ++i) {
        RenderStyle* pseudoStyle = m_cachedPseudoStyles->at(i).get();
        if (pseudoStyle->styleType() == pid)
            return pseudoStyle;
    }

    return 0;
}

RenderStyle* RenderStyle::addCachedPseudoStyle(PassRefPtr<RenderStyle> pseudo)
{
    if (!pseudo)
        return 0;

    ASSERT(pseudo->styleType() > NOPSEUDO);

    RenderStyle* result = pseudo.get();

    if (!m_cachedPseudoStyles)
        m_cachedPseudoStyles = adoptPtr(new PseudoStyleCache);

    m_cachedPseudoStyles->append(pseudo);

    return result;
}

void RenderStyle::removeCachedPseudoStyle(PseudoId pid)
{
    if (!m_cachedPseudoStyles)
        return;
    for (size_t i = 0; i < m_cachedPseudoStyles->size(); ++i) {
        RenderStyle* pseudoStyle = m_cachedPseudoStyles->at(i).get();
        if (pseudoStyle->styleType() == pid) {
            m_cachedPseudoStyles->remove(i);
            return;
        }
    }
}

bool RenderStyle::inheritedNotEqual(const RenderStyle* other) const
{
    return inherited_flags != other->inherited_flags
           || inherited != other->inherited
           || m_svgStyle->inheritedNotEqual(other->m_svgStyle.get())
           || rareInheritedData != other->rareInheritedData;
}

bool RenderStyle::inheritedDataShared(const RenderStyle* other) const
{
    // This is a fast check that only looks if the data structures are shared.
    return inherited_flags == other->inherited_flags
        && inherited.get() == other->inherited.get()
        && m_svgStyle.get() == other->m_svgStyle.get()
        && rareInheritedData.get() == other->rareInheritedData.get();
}

static bool positionedObjectMovedOnly(const LengthBox& a, const LengthBox& b, const Length& width)
{
    // If any unit types are different, then we can't guarantee
    // that this was just a movement.
    if (a.left().type() != b.left().type()
        || a.right().type() != b.right().type()
        || a.top().type() != b.top().type()
        || a.bottom().type() != b.bottom().type())
        return false;

    // Only one unit can be non-auto in the horizontal direction and
    // in the vertical direction.  Otherwise the adjustment of values
    // is changing the size of the box.
    if (!a.left().isIntrinsicOrAuto() && !a.right().isIntrinsicOrAuto())
        return false;
    if (!a.top().isIntrinsicOrAuto() && !a.bottom().isIntrinsicOrAuto())
        return false;
    // If our width is auto and left or right is specified and changed then this
    // is not just a movement - we need to resize to our container.
    if (width.isIntrinsicOrAuto()
        && ((!a.left().isIntrinsicOrAuto() && a.left() != b.left())
            || (!a.right().isIntrinsicOrAuto() && a.right() != b.right())))
        return false;

    // One of the units is fixed or percent in both directions and stayed
    // that way in the new style.  Therefore all we are doing is moving.
    return true;
}

StyleDifference RenderStyle::visualInvalidationDiff(const RenderStyle& other, unsigned& changedContextSensitiveProperties) const
{
    changedContextSensitiveProperties = ContextSensitivePropertyNone;

    // Note, we use .get() on each DataRef below because DataRef::operator== will do a deep
    // compare, which is duplicate work when we're going to compare each property inside
    // this function anyway.

    StyleDifference svgChange = StyleDifferenceEqual;
    if (m_svgStyle.get() != other.m_svgStyle.get()) {
        svgChange = m_svgStyle->diff(other.m_svgStyle.get());
        if (svgChange == StyleDifferenceLayout)
            return svgChange;
    }

    if (m_box.get() != other.m_box.get()) {
        if (m_box->width() != other.m_box->width()
            || m_box->minWidth() != other.m_box->minWidth()
            || m_box->maxWidth() != other.m_box->maxWidth()
            || m_box->height() != other.m_box->height()
            || m_box->minHeight() != other.m_box->minHeight()
            || m_box->maxHeight() != other.m_box->maxHeight())
            return StyleDifferenceLayout;

        if (m_box->verticalAlign() != other.m_box->verticalAlign())
            return StyleDifferenceLayout;

        if (m_box->boxSizing() != other.m_box->boxSizing())
            return StyleDifferenceLayout;
    }

    if (surround.get() != other.surround.get()) {
        if (surround->margin != other.surround->margin)
            return StyleDifferenceLayout;

        if (surround->padding != other.surround->padding)
            return StyleDifferenceLayout;

        // If our border widths change, then we need to layout. Other changes to borders only necessitate a repaint.
        if (borderLeftWidth() != other.borderLeftWidth()
            || borderTopWidth() != other.borderTopWidth()
            || borderBottomWidth() != other.borderBottomWidth()
            || borderRightWidth() != other.borderRightWidth())
            return StyleDifferenceLayout;
    }

    if (rareNonInheritedData.get() != other.rareNonInheritedData.get()) {
        if (rareNonInheritedData->m_appearance != other.rareNonInheritedData->m_appearance
            || rareNonInheritedData->marginBeforeCollapse != other.rareNonInheritedData->marginBeforeCollapse
            || rareNonInheritedData->marginAfterCollapse != other.rareNonInheritedData->marginAfterCollapse
            || rareNonInheritedData->lineClamp != other.rareNonInheritedData->lineClamp
            || rareNonInheritedData->textOverflow != other.rareNonInheritedData->textOverflow
            || rareNonInheritedData->m_wrapFlow != other.rareNonInheritedData->m_wrapFlow
            || rareNonInheritedData->m_wrapThrough != other.rareNonInheritedData->m_wrapThrough
            || rareNonInheritedData->m_shapeMargin != other.rareNonInheritedData->m_shapeMargin
            || rareNonInheritedData->m_order != other.rareNonInheritedData->m_order
            || rareNonInheritedData->m_alignContent != other.rareNonInheritedData->m_alignContent
            || rareNonInheritedData->m_alignItems != other.rareNonInheritedData->m_alignItems
            || rareNonInheritedData->m_alignSelf != other.rareNonInheritedData->m_alignSelf
            || rareNonInheritedData->m_justifyContent != other.rareNonInheritedData->m_justifyContent
            || rareNonInheritedData->m_grid.get() != other.rareNonInheritedData->m_grid.get()
            || rareNonInheritedData->m_gridItem.get() != other.rareNonInheritedData->m_gridItem.get()
            || rareNonInheritedData->m_textCombine != other.rareNonInheritedData->m_textCombine
            || rareNonInheritedData->hasFilters() != other.rareNonInheritedData->hasFilters())
            return StyleDifferenceLayout;

        if (rareNonInheritedData->m_deprecatedFlexibleBox.get() != other.rareNonInheritedData->m_deprecatedFlexibleBox.get()
            && *rareNonInheritedData->m_deprecatedFlexibleBox.get() != *other.rareNonInheritedData->m_deprecatedFlexibleBox.get())
            return StyleDifferenceLayout;

        if (rareNonInheritedData->m_flexibleBox.get() != other.rareNonInheritedData->m_flexibleBox.get()
            && *rareNonInheritedData->m_flexibleBox.get() != *other.rareNonInheritedData->m_flexibleBox.get())
            return StyleDifferenceLayout;

        // FIXME: We should add an optimized form of layout that just recomputes visual overflow.
        if (!rareNonInheritedData->shadowDataEquivalent(*other.rareNonInheritedData.get()))
            return StyleDifferenceLayout;

        if (!rareNonInheritedData->reflectionDataEquivalent(*other.rareNonInheritedData.get()))
            return StyleDifferenceLayout;

        if (rareNonInheritedData->m_multiCol.get() != other.rareNonInheritedData->m_multiCol.get()
            && *rareNonInheritedData->m_multiCol.get() != *other.rareNonInheritedData->m_multiCol.get())
            return StyleDifferenceLayout;

        if (!transformDataEquivalent(other)) {
            // Don't return early here; instead take note of the type of
            // change, and deal with it when looking at compositing.
            changedContextSensitiveProperties |= ContextSensitivePropertyTransform;
        }

        // If the counter directives change, trigger a relayout to re-calculate counter values and rebuild the counter node tree.
        const CounterDirectiveMap* mapA = rareNonInheritedData->m_counterDirectives.get();
        const CounterDirectiveMap* mapB = other.rareNonInheritedData->m_counterDirectives.get();
        if (!(mapA == mapB || (mapA && mapB && *mapA == *mapB)))
            return StyleDifferenceLayout;

        // We only need do layout for opacity changes if adding or losing opacity could trigger a change
        // in us being a stacking context.
        if (hasAutoZIndex() != other.hasAutoZIndex() && rareNonInheritedData->hasOpacity() != other.rareNonInheritedData->hasOpacity()) {
            // FIXME: We would like to use SimplifiedLayout here, but we can't quite do that yet.
            // We need to make sure SimplifiedLayout can operate correctly on RenderInlines (we will need
            // to add a selfNeedsSimplifiedLayout bit in order to not get confused and taint every line).
            // In addition we need to solve the floating object issue when layers come and go. Right now
            // a full layout is necessary to keep floating object lists sane.
            return StyleDifferenceLayout;
        }
    }

    if (rareInheritedData.get() != other.rareInheritedData.get()) {
        if (rareInheritedData->highlight != other.rareInheritedData->highlight
            || rareInheritedData->indent != other.rareInheritedData->indent
            || rareInheritedData->m_textAlignLast != other.rareInheritedData->m_textAlignLast
            || rareInheritedData->m_textIndentLine != other.rareInheritedData->m_textIndentLine
            || rareInheritedData->m_effectiveZoom != other.rareInheritedData->m_effectiveZoom
            || rareInheritedData->wordBreak != other.rareInheritedData->wordBreak
            || rareInheritedData->overflowWrap != other.rareInheritedData->overflowWrap
            || rareInheritedData->lineBreak != other.rareInheritedData->lineBreak
            || rareInheritedData->textSecurity != other.rareInheritedData->textSecurity
            || rareInheritedData->hyphens != other.rareInheritedData->hyphens
            || rareInheritedData->hyphenationLimitBefore != other.rareInheritedData->hyphenationLimitBefore
            || rareInheritedData->hyphenationLimitAfter != other.rareInheritedData->hyphenationLimitAfter
            || rareInheritedData->hyphenationString != other.rareInheritedData->hyphenationString
            || rareInheritedData->locale != other.rareInheritedData->locale
            || rareInheritedData->m_rubyPosition != other.rareInheritedData->m_rubyPosition
            || rareInheritedData->textEmphasisMark != other.rareInheritedData->textEmphasisMark
            || rareInheritedData->textEmphasisPosition != other.rareInheritedData->textEmphasisPosition
            || rareInheritedData->textEmphasisCustomMark != other.rareInheritedData->textEmphasisCustomMark
            || rareInheritedData->m_textJustify != other.rareInheritedData->m_textJustify
            || rareInheritedData->m_textOrientation != other.rareInheritedData->m_textOrientation
            || rareInheritedData->m_tabSize != other.rareInheritedData->m_tabSize
            || rareInheritedData->m_lineBoxContain != other.rareInheritedData->m_lineBoxContain
            || rareInheritedData->listStyleImage != other.rareInheritedData->listStyleImage
            || rareInheritedData->textStrokeWidth != other.rareInheritedData->textStrokeWidth)
            return StyleDifferenceLayout;

        if (!rareInheritedData->shadowDataEquivalent(*other.rareInheritedData.get()))
            return StyleDifferenceLayout;

        if (!QuotesData::equals(rareInheritedData->quotes.get(), other.rareInheritedData->quotes.get()))
            return StyleDifferenceLayout;
    }

    if (visual->m_textAutosizingMultiplier != other.visual->m_textAutosizingMultiplier)
        return StyleDifferenceLayout;

    if (inherited.get() != other.inherited.get()) {
        if (inherited->line_height != other.inherited->line_height
        || inherited->font != other.inherited->font
        || inherited->horizontal_border_spacing != other.inherited->horizontal_border_spacing
        || inherited->vertical_border_spacing != other.inherited->vertical_border_spacing)
        return StyleDifferenceLayout;
    }

    if (inherited_flags._box_direction != other.inherited_flags._box_direction
        || inherited_flags.m_rtlOrdering != other.inherited_flags.m_rtlOrdering
        || inherited_flags._text_align != other.inherited_flags._text_align
        || inherited_flags._text_transform != other.inherited_flags._text_transform
        || inherited_flags._direction != other.inherited_flags._direction
        || inherited_flags._white_space != other.inherited_flags._white_space
        || inherited_flags.m_writingMode != other.inherited_flags.m_writingMode)
        return StyleDifferenceLayout;

    if (noninherited_flags._overflowX != other.noninherited_flags._overflowX
        || noninherited_flags._overflowY != other.noninherited_flags._overflowY
        || noninherited_flags._clear != other.noninherited_flags._clear
        || noninherited_flags._unicodeBidi != other.noninherited_flags._unicodeBidi
        || noninherited_flags._position != other.noninherited_flags._position
        || noninherited_flags._floating != other.noninherited_flags._floating
        || noninherited_flags._originalDisplay != other.noninherited_flags._originalDisplay
        || noninherited_flags._vertical_align != other.noninherited_flags._vertical_align)
        return StyleDifferenceLayout;

    if (noninherited_flags._effectiveDisplay >= FIRST_TABLE_DISPLAY && noninherited_flags._effectiveDisplay <= LAST_TABLE_DISPLAY) {
        if (inherited_flags._border_collapse != other.inherited_flags._border_collapse
            || inherited_flags._empty_cells != other.inherited_flags._empty_cells
            || inherited_flags._caption_side != other.inherited_flags._caption_side
            || noninherited_flags._table_layout != other.noninherited_flags._table_layout)
            return StyleDifferenceLayout;

        // In the collapsing border model, 'hidden' suppresses other borders, while 'none'
        // does not, so these style differences can be width differences.
        if (inherited_flags._border_collapse
            && ((borderTopStyle() == BHIDDEN && other.borderTopStyle() == BNONE)
                || (borderTopStyle() == BNONE && other.borderTopStyle() == BHIDDEN)
                || (borderBottomStyle() == BHIDDEN && other.borderBottomStyle() == BNONE)
                || (borderBottomStyle() == BNONE && other.borderBottomStyle() == BHIDDEN)
                || (borderLeftStyle() == BHIDDEN && other.borderLeftStyle() == BNONE)
                || (borderLeftStyle() == BNONE && other.borderLeftStyle() == BHIDDEN)
                || (borderRightStyle() == BHIDDEN && other.borderRightStyle() == BNONE)
                || (borderRightStyle() == BNONE && other.borderRightStyle() == BHIDDEN)))
            return StyleDifferenceLayout;
    } else if (noninherited_flags._effectiveDisplay == LIST_ITEM) {
        if (inherited_flags._list_style_type != other.inherited_flags._list_style_type
            || inherited_flags._list_style_position != other.inherited_flags._list_style_position)
            return StyleDifferenceLayout;
    }

    if ((visibility() == COLLAPSE) != (other.visibility() == COLLAPSE))
        return StyleDifferenceLayout;

    // SVGRenderStyle::diff() might have returned StyleDifferenceRepaint, eg. if fill changes.
    // If eg. the font-size changed at the same time, we're not allowed to return StyleDifferenceRepaint,
    // but have to return StyleDifferenceLayout, that's why  this if branch comes after all branches
    // that are relevant for SVG and might return StyleDifferenceLayout.
    if (svgChange != StyleDifferenceEqual)
        return svgChange;

    // NOTE: This block must be last in this function for the StyleDifferenceLayoutPositionedMovementOnly
    // optimization to work properly.
    if (position() != StaticPosition && surround->offset != other.surround->offset) {
        // Optimize for the case where a positioned layer is moving but not changing size.
        if ((position() == AbsolutePosition || position() == FixedPosition)
            && positionedObjectMovedOnly(surround->offset, other.surround->offset, m_box->width())
            && repaintOnlyDiff(other, changedContextSensitiveProperties) == StyleDifferenceEqual)
            return StyleDifferenceLayoutPositionedMovementOnly;
        // FIXME: We would like to use SimplifiedLayout for relative positioning, but we can't quite do that yet.
        // We need to make sure SimplifiedLayout can operate correctly on RenderInlines (we will need
        // to add a selfNeedsSimplifiedLayout bit in order to not get confused and taint every line).
        return StyleDifferenceLayout;
    }

    return repaintOnlyDiff(other, changedContextSensitiveProperties);
}

StyleDifference RenderStyle::repaintOnlyDiff(const RenderStyle& other, unsigned& changedContextSensitiveProperties) const
{
    if (position() != StaticPosition && (m_box->zIndex() != other.m_box->zIndex() || m_box->hasAutoZIndex() != other.m_box->hasAutoZIndex()
        || visual->clip != other.visual->clip || visual->hasClip != other.visual->hasClip))
        return StyleDifferenceRepaintLayer;

    if (RuntimeEnabledFeatures::cssCompositingEnabled() && (rareNonInheritedData->m_effectiveBlendMode != other.rareNonInheritedData->m_effectiveBlendMode
        || rareNonInheritedData->m_isolation != other.rareNonInheritedData->m_isolation))
        return StyleDifferenceRepaintLayer;

    if (rareNonInheritedData->opacity != other.rareNonInheritedData->opacity) {
        // Don't return early here; instead take note of the type of change,
        // and deal with it when looking at compositing.
        changedContextSensitiveProperties |= ContextSensitivePropertyOpacity;
    }

    if (rareNonInheritedData->m_filter.get() != other.rareNonInheritedData->m_filter.get()
        && *rareNonInheritedData->m_filter.get() != *other.rareNonInheritedData->m_filter.get()) {
        // Don't return early here; instead take note of the type of change,
        // and deal with it when looking at compositing.
        changedContextSensitiveProperties |= ContextSensitivePropertyFilter;
    }

    if (rareNonInheritedData->m_mask != other.rareNonInheritedData->m_mask
        || rareNonInheritedData->m_maskBoxImage != other.rareNonInheritedData->m_maskBoxImage)
        return StyleDifferenceRepaintLayer;

    if (inherited_flags._visibility != other.inherited_flags._visibility
        || inherited_flags.m_printColorAdjust != other.inherited_flags.m_printColorAdjust
        || inherited_flags._insideLink != other.inherited_flags._insideLink
        || !surround->border.visuallyEqual(other.surround->border)
        || !m_background->visuallyEqual(*other.m_background)
        || rareInheritedData->userModify != other.rareInheritedData->userModify
        || rareInheritedData->userSelect != other.rareInheritedData->userSelect
        || rareNonInheritedData->userDrag != other.rareNonInheritedData->userDrag
        || rareNonInheritedData->m_borderFit != other.rareNonInheritedData->m_borderFit
        || rareNonInheritedData->m_objectFit != other.rareNonInheritedData->m_objectFit
        || rareNonInheritedData->m_objectPosition != other.rareNonInheritedData->m_objectPosition
        || rareInheritedData->m_imageRendering != other.rareInheritedData->m_imageRendering)
        return StyleDifferenceRepaint;

        // FIXME: The current spec is being reworked to remove dependencies between exclusions and affected
        // content. There's a proposal to use floats instead. In that case, wrap-shape should actually relayout
        // the parent container. For sure, I will have to revisit this code, but for now I've added this in order
        // to avoid having diff() == StyleDifferenceEqual where wrap-shapes actually differ.
        // Tracking bug: https://bugs.webkit.org/show_bug.cgi?id=62991
        if (rareNonInheritedData->m_shapeOutside != other.rareNonInheritedData->m_shapeOutside)
            return StyleDifferenceRepaint;

        if (rareNonInheritedData->m_clipPath != other.rareNonInheritedData->m_clipPath)
            return StyleDifferenceRepaint;

    if (rareNonInheritedData.get() != other.rareNonInheritedData.get()) {
        if (rareNonInheritedData->m_transformStyle3D != other.rareNonInheritedData->m_transformStyle3D
            || rareNonInheritedData->m_backfaceVisibility != other.rareNonInheritedData->m_backfaceVisibility
            || rareNonInheritedData->m_perspective != other.rareNonInheritedData->m_perspective
            || rareNonInheritedData->m_perspectiveOriginX != other.rareNonInheritedData->m_perspectiveOriginX
            || rareNonInheritedData->m_perspectiveOriginY != other.rareNonInheritedData->m_perspectiveOriginY
            || hasWillChangeCompositingHint() != other.hasWillChangeCompositingHint()
            || hasWillChangeGpuRasterizationHint() != other.hasWillChangeGpuRasterizationHint())
            return StyleDifferenceRecompositeLayer;
    }

    if (inherited->color != other.inherited->color
        || inherited_flags._text_decorations != other.inherited_flags._text_decorations
        || visual->textDecoration != other.visual->textDecoration
        || rareNonInheritedData->m_textDecorationStyle != other.rareNonInheritedData->m_textDecorationStyle
        || rareNonInheritedData->m_textDecorationColor != other.rareNonInheritedData->m_textDecorationColor
        || rareInheritedData->textFillColor() != other.rareInheritedData->textFillColor()
        || rareInheritedData->textStrokeColor() != other.rareInheritedData->textStrokeColor()
        || rareInheritedData->textEmphasisColor() != other.rareInheritedData->textEmphasisColor()
        || rareInheritedData->textEmphasisFill != other.rareInheritedData->textEmphasisFill)
        return StyleDifferenceRepaintIfTextOrColorChange;

    // Cursors are not checked, since they will be set appropriately in response to mouse events,
    // so they don't need to cause any repaint or layout.

    // Animations don't need to be checked either.  We always set the new style on the RenderObject, so we will get a chance to fire off
    // the resulting transition properly.
    return StyleDifferenceEqual;
}

void RenderStyle::setClip(Length top, Length right, Length bottom, Length left)
{
    StyleVisualData* data = visual.access();
    data->clip.m_top = top;
    data->clip.m_right = right;
    data->clip.m_bottom = bottom;
    data->clip.m_left = left;
}

void RenderStyle::addCursor(PassRefPtr<StyleImage> image, const IntPoint& hotSpot)
{
    if (!rareInheritedData.access()->cursorData)
        rareInheritedData.access()->cursorData = CursorList::create();
    rareInheritedData.access()->cursorData->append(CursorData(image, hotSpot));
}

void RenderStyle::setCursorList(PassRefPtr<CursorList> other)
{
    rareInheritedData.access()->cursorData = other;
}

void RenderStyle::setQuotes(PassRefPtr<QuotesData> q)
{
    if (QuotesData::equals(rareInheritedData->quotes.get(), q.get()))
        return;
    rareInheritedData.access()->quotes = q;
}

void RenderStyle::clearCursorList()
{
    if (rareInheritedData->cursorData)
        rareInheritedData.access()->cursorData = nullptr;
}

void RenderStyle::addCallbackSelector(const String& selector)
{
    if (!rareNonInheritedData->m_callbackSelectors.contains(selector))
        rareNonInheritedData.access()->m_callbackSelectors.append(selector);
}

void RenderStyle::clearContent()
{
    if (rareNonInheritedData->m_content)
        rareNonInheritedData.access()->m_content = nullptr;
}

void RenderStyle::appendContent(PassOwnPtr<ContentData> contentData)
{
    OwnPtr<ContentData>& content = rareNonInheritedData.access()->m_content;
    ContentData* lastContent = content.get();
    while (lastContent && lastContent->next())
        lastContent = lastContent->next();

    if (lastContent)
        lastContent->setNext(contentData);
    else
        content = contentData;
}

void RenderStyle::setContent(PassRefPtr<StyleImage> image, bool add)
{
    if (!image)
        return;

    if (add) {
        appendContent(ContentData::create(image));
        return;
    }

    rareNonInheritedData.access()->m_content = ContentData::create(image);
}

void RenderStyle::setContent(const String& string, bool add)
{
    OwnPtr<ContentData>& content = rareNonInheritedData.access()->m_content;
    if (add) {
        ContentData* lastContent = content.get();
        while (lastContent && lastContent->next())
            lastContent = lastContent->next();

        if (lastContent) {
            // We attempt to merge with the last ContentData if possible.
            if (lastContent->isText()) {
                TextContentData* textContent = static_cast<TextContentData*>(lastContent);
                textContent->setText(textContent->text() + string);
            } else
                lastContent->setNext(ContentData::create(string));

            return;
        }
    }

    content = ContentData::create(string);
}

void RenderStyle::setContent(PassOwnPtr<CounterContent> counter, bool add)
{
    if (!counter)
        return;

    if (add) {
        appendContent(ContentData::create(counter));
        return;
    }

    rareNonInheritedData.access()->m_content = ContentData::create(counter);
}

void RenderStyle::setContent(QuoteType quote, bool add)
{
    if (add) {
        appendContent(ContentData::create(quote));
        return;
    }

    rareNonInheritedData.access()->m_content = ContentData::create(quote);
}

blink::WebBlendMode RenderStyle::blendMode() const
{
    if (RuntimeEnabledFeatures::cssCompositingEnabled())
        return static_cast<blink::WebBlendMode>(rareNonInheritedData->m_effectiveBlendMode);
    return blink::WebBlendModeNormal;
}

void RenderStyle::setBlendMode(blink::WebBlendMode v)
{
    if (RuntimeEnabledFeatures::cssCompositingEnabled())
        rareNonInheritedData.access()->m_effectiveBlendMode = v;
}

bool RenderStyle::hasBlendMode() const
{
    if (RuntimeEnabledFeatures::cssCompositingEnabled())
        return static_cast<blink::WebBlendMode>(rareNonInheritedData->m_effectiveBlendMode) != blink::WebBlendModeNormal;
    return false;
}

EIsolation RenderStyle::isolation() const
{
    if (RuntimeEnabledFeatures::cssCompositingEnabled())
        return static_cast<EIsolation>(rareNonInheritedData->m_isolation);
    return IsolationAuto;
}

void RenderStyle::setIsolation(EIsolation v)
{
    if (RuntimeEnabledFeatures::cssCompositingEnabled())
        rareNonInheritedData.access()->m_isolation = v;
}

bool RenderStyle::hasIsolation() const
{
    if (RuntimeEnabledFeatures::cssCompositingEnabled())
        return rareNonInheritedData->m_isolation != IsolationAuto;
    return false;
}

bool RenderStyle::hasWillChangeCompositingHint() const
{
    for (size_t i = 0; i < rareNonInheritedData->m_willChange->m_properties.size(); ++i) {
        switch (rareNonInheritedData->m_willChange->m_properties[i]) {
        case CSSPropertyOpacity:
        case CSSPropertyTransform:
        case CSSPropertyWebkitTransform:
        case CSSPropertyLeft:
        case CSSPropertyTop:
        case CSSPropertyRight:
        case CSSPropertyBottom:
        case CSSPropertyWebkitFilter:
            return true;
        default:
            break;
        }
    }
    return false;
}

bool RenderStyle::hasWillChangeGpuRasterizationHint() const
{
    if (willChangeContents())
        return true;

    for (size_t i = 0; i < rareNonInheritedData->m_willChange->m_properties.size(); ++i) {
        switch (rareNonInheritedData->m_willChange->m_properties[i]) {
        case CSSPropertyWidth:
        case CSSPropertyHeight:
        case CSSPropertyBackgroundColor:
        case CSSPropertyBackgroundPosition:
            return true;
        default:
            break;
        }
    }
    return false;
}

inline bool requireTransformOrigin(const Vector<RefPtr<TransformOperation> >& transformOperations, RenderStyle::ApplyTransformOrigin applyOrigin)
{
    // transform-origin brackets the transform with translate operations.
    // Optimize for the case where the only transform is a translation, since the transform-origin is irrelevant
    // in that case.
    if (applyOrigin != RenderStyle::IncludeTransformOrigin)
        return false;

    unsigned size = transformOperations.size();
    for (unsigned i = 0; i < size; ++i) {
        TransformOperation::OperationType type = transformOperations[i]->type();
        if (type != TransformOperation::TranslateX
            && type != TransformOperation::TranslateY
            && type != TransformOperation::Translate
            && type != TransformOperation::TranslateZ
            && type != TransformOperation::Translate3D)
            return true;
    }

    return false;
}

void RenderStyle::applyTransform(TransformationMatrix& transform, const LayoutSize& borderBoxSize, ApplyTransformOrigin applyOrigin) const
{
    applyTransform(transform, FloatRect(FloatPoint(), borderBoxSize), applyOrigin);
}

void RenderStyle::applyTransform(TransformationMatrix& transform, const FloatRect& boundingBox, ApplyTransformOrigin applyOrigin) const
{
    const Vector<RefPtr<TransformOperation> >& transformOperations = rareNonInheritedData->m_transform->m_operations.operations();
    bool applyTransformOrigin = requireTransformOrigin(transformOperations, applyOrigin);

    float offsetX = transformOriginX().type() == Percent ? boundingBox.x() : 0;
    float offsetY = transformOriginY().type() == Percent ? boundingBox.y() : 0;

    if (applyTransformOrigin) {
        transform.translate3d(floatValueForLength(transformOriginX(), boundingBox.width()) + offsetX,
            floatValueForLength(transformOriginY(), boundingBox.height()) + offsetY,
            transformOriginZ());
    }

    unsigned size = transformOperations.size();
    for (unsigned i = 0; i < size; ++i)
        transformOperations[i]->apply(transform, boundingBox.size());

    if (applyTransformOrigin) {
        transform.translate3d(-floatValueForLength(transformOriginX(), boundingBox.width()) - offsetX,
            -floatValueForLength(transformOriginY(), boundingBox.height()) - offsetY,
            -transformOriginZ());
    }
}

void RenderStyle::setTextShadow(PassRefPtr<ShadowList> s)
{
    rareInheritedData.access()->textShadow = s;
}

void RenderStyle::setBoxShadow(PassRefPtr<ShadowList> s)
{
    rareNonInheritedData.access()->m_boxShadow = s;
}

static RoundedRect::Radii calcRadiiFor(const BorderData& border, IntSize size)
{
    return RoundedRect::Radii(
        IntSize(valueForLength(border.topLeft().width(), size.width()),
            valueForLength(border.topLeft().height(), size.height())),
        IntSize(valueForLength(border.topRight().width(), size.width()),
            valueForLength(border.topRight().height(), size.height())),
        IntSize(valueForLength(border.bottomLeft().width(), size.width()),
            valueForLength(border.bottomLeft().height(), size.height())),
        IntSize(valueForLength(border.bottomRight().width(), size.width()),
            valueForLength(border.bottomRight().height(), size.height())));
}

StyleImage* RenderStyle::listStyleImage() const { return rareInheritedData->listStyleImage.get(); }
void RenderStyle::setListStyleImage(PassRefPtr<StyleImage> v)
{
    if (rareInheritedData->listStyleImage != v)
        rareInheritedData.access()->listStyleImage = v;
}

Color RenderStyle::color() const { return inherited->color; }
Color RenderStyle::visitedLinkColor() const { return inherited->visitedLinkColor; }
void RenderStyle::setColor(const Color& v) { SET_VAR(inherited, color, v); }
void RenderStyle::setVisitedLinkColor(const Color& v) { SET_VAR(inherited, visitedLinkColor, v); }

short RenderStyle::horizontalBorderSpacing() const { return inherited->horizontal_border_spacing; }
short RenderStyle::verticalBorderSpacing() const { return inherited->vertical_border_spacing; }
void RenderStyle::setHorizontalBorderSpacing(short v) { SET_VAR(inherited, horizontal_border_spacing, v); }
void RenderStyle::setVerticalBorderSpacing(short v) { SET_VAR(inherited, vertical_border_spacing, v); }

RoundedRect RenderStyle::getRoundedBorderFor(const LayoutRect& borderRect, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const
{
    IntRect snappedBorderRect(pixelSnappedIntRect(borderRect));
    RoundedRect roundedRect(snappedBorderRect);
    if (hasBorderRadius()) {
        RoundedRect::Radii radii = calcRadiiFor(surround->border, snappedBorderRect.size());
        radii.scale(calcBorderRadiiConstraintScaleFor(borderRect, radii));
        roundedRect.includeLogicalEdges(radii, isHorizontalWritingMode(), includeLogicalLeftEdge, includeLogicalRightEdge);
    }
    return roundedRect;
}

RoundedRect RenderStyle::getRoundedInnerBorderFor(const LayoutRect& borderRect, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const
{
    bool horizontal = isHorizontalWritingMode();

    int leftWidth = (!horizontal || includeLogicalLeftEdge) ? borderLeftWidth() : 0;
    int rightWidth = (!horizontal || includeLogicalRightEdge) ? borderRightWidth() : 0;
    int topWidth = (horizontal || includeLogicalLeftEdge) ? borderTopWidth() : 0;
    int bottomWidth = (horizontal || includeLogicalRightEdge) ? borderBottomWidth() : 0;

    return getRoundedInnerBorderFor(borderRect, topWidth, bottomWidth, leftWidth, rightWidth, includeLogicalLeftEdge, includeLogicalRightEdge);
}

RoundedRect RenderStyle::getRoundedInnerBorderFor(const LayoutRect& borderRect,
    int topWidth, int bottomWidth, int leftWidth, int rightWidth, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const
{
    LayoutRect innerRect(borderRect.x() + leftWidth,
               borderRect.y() + topWidth,
               borderRect.width() - leftWidth - rightWidth,
               borderRect.height() - topWidth - bottomWidth);

    RoundedRect roundedRect(pixelSnappedIntRect(innerRect));

    if (hasBorderRadius()) {
        RoundedRect::Radii radii = getRoundedBorderFor(borderRect).radii();
        radii.shrink(topWidth, bottomWidth, leftWidth, rightWidth);
        roundedRect.includeLogicalEdges(radii, isHorizontalWritingMode(), includeLogicalLeftEdge, includeLogicalRightEdge);
    }
    return roundedRect;
}

static bool allLayersAreFixed(const FillLayer* layer)
{
    bool allFixed = true;

    for (const FillLayer* currLayer = layer; currLayer; currLayer = currLayer->next())
        allFixed &= (currLayer->image() && currLayer->attachment() == FixedBackgroundAttachment);

    return layer && allFixed;
}

bool RenderStyle::hasEntirelyFixedBackground() const
{
    return allLayersAreFixed(backgroundLayers());
}

const CounterDirectiveMap* RenderStyle::counterDirectives() const
{
    return rareNonInheritedData->m_counterDirectives.get();
}

CounterDirectiveMap& RenderStyle::accessCounterDirectives()
{
    OwnPtr<CounterDirectiveMap>& map = rareNonInheritedData.access()->m_counterDirectives;
    if (!map)
        map = adoptPtr(new CounterDirectiveMap);
    return *map;
}

const CounterDirectives RenderStyle::getCounterDirectives(const AtomicString& identifier) const
{
    if (const CounterDirectiveMap* directives = counterDirectives())
        return directives->get(identifier);
    return CounterDirectives();
}

const AtomicString& RenderStyle::hyphenString() const
{
    const AtomicString& hyphenationString = rareInheritedData.get()->hyphenationString;
    if (!hyphenationString.isNull())
        return hyphenationString;

    // FIXME: This should depend on locale.
    DEFINE_STATIC_LOCAL(AtomicString, hyphenMinusString, (&hyphenMinus, 1));
    DEFINE_STATIC_LOCAL(AtomicString, hyphenString, (&hyphen, 1));
    return font().primaryFontHasGlyphForCharacter(hyphen) ? hyphenString : hyphenMinusString;
}

const AtomicString& RenderStyle::textEmphasisMarkString() const
{
    switch (textEmphasisMark()) {
    case TextEmphasisMarkNone:
        return nullAtom;
    case TextEmphasisMarkCustom:
        return textEmphasisCustomMark();
    case TextEmphasisMarkDot: {
        DEFINE_STATIC_LOCAL(AtomicString, filledDotString, (&bullet, 1));
        DEFINE_STATIC_LOCAL(AtomicString, openDotString, (&whiteBullet, 1));
        return textEmphasisFill() == TextEmphasisFillFilled ? filledDotString : openDotString;
    }
    case TextEmphasisMarkCircle: {
        DEFINE_STATIC_LOCAL(AtomicString, filledCircleString, (&blackCircle, 1));
        DEFINE_STATIC_LOCAL(AtomicString, openCircleString, (&whiteCircle, 1));
        return textEmphasisFill() == TextEmphasisFillFilled ? filledCircleString : openCircleString;
    }
    case TextEmphasisMarkDoubleCircle: {
        DEFINE_STATIC_LOCAL(AtomicString, filledDoubleCircleString, (&fisheye, 1));
        DEFINE_STATIC_LOCAL(AtomicString, openDoubleCircleString, (&bullseye, 1));
        return textEmphasisFill() == TextEmphasisFillFilled ? filledDoubleCircleString : openDoubleCircleString;
    }
    case TextEmphasisMarkTriangle: {
        DEFINE_STATIC_LOCAL(AtomicString, filledTriangleString, (&blackUpPointingTriangle, 1));
        DEFINE_STATIC_LOCAL(AtomicString, openTriangleString, (&whiteUpPointingTriangle, 1));
        return textEmphasisFill() == TextEmphasisFillFilled ? filledTriangleString : openTriangleString;
    }
    case TextEmphasisMarkSesame: {
        DEFINE_STATIC_LOCAL(AtomicString, filledSesameString, (&sesameDot, 1));
        DEFINE_STATIC_LOCAL(AtomicString, openSesameString, (&whiteSesameDot, 1));
        return textEmphasisFill() == TextEmphasisFillFilled ? filledSesameString : openSesameString;
    }
    case TextEmphasisMarkAuto:
        ASSERT_NOT_REACHED();
        return nullAtom;
    }

    ASSERT_NOT_REACHED();
    return nullAtom;
}

void RenderStyle::adjustAnimations()
{
    CSSAnimationDataList* animationList = rareNonInheritedData->m_animations.get();
    if (!animationList)
        return;

    // Get rid of empty animations and anything beyond them
    for (size_t i = 0; i < animationList->size(); ++i) {
        if (animationList->animation(i)->isEmpty()) {
            animationList->resize(i);
            break;
        }
    }

    if (animationList->isEmpty()) {
        clearAnimations();
        return;
    }

    // Repeat patterns into layers that don't have some properties set.
    animationList->fillUnsetProperties();
}

void RenderStyle::adjustTransitions()
{
    CSSAnimationDataList* transitionList = rareNonInheritedData->m_transitions.get();
    if (!transitionList)
        return;

    // Get rid of empty transitions and anything beyond them
    for (size_t i = 0; i < transitionList->size(); ++i) {
        if (transitionList->animation(i)->isEmpty()) {
            transitionList->resize(i);
            break;
        }
    }

    if (transitionList->isEmpty()) {
        clearTransitions();
        return;
    }

    // Repeat patterns into layers that don't have some properties set.
    transitionList->fillUnsetProperties();

    // Make sure there are no duplicate properties. This is an O(n^2) algorithm
    // but the lists tend to be very short, so it is probably ok
    for (size_t i = 0; i < transitionList->size(); ++i) {
        for (size_t j = i+1; j < transitionList->size(); ++j) {
            if (transitionList->animation(i)->property() == transitionList->animation(j)->property()) {
                // toss i
                transitionList->remove(i);
                j = i;
            }
        }
    }
}

CSSAnimationDataList* RenderStyle::accessAnimations()
{
    if (!rareNonInheritedData.access()->m_animations)
        rareNonInheritedData.access()->m_animations = adoptPtrWillBeNoop(new CSSAnimationDataList());
    return rareNonInheritedData->m_animations.get();
}

CSSAnimationDataList* RenderStyle::accessTransitions()
{
    if (!rareNonInheritedData.access()->m_transitions)
        rareNonInheritedData.access()->m_transitions = adoptPtrWillBeNoop(new CSSAnimationDataList());
    return rareNonInheritedData->m_transitions.get();
}

const CSSAnimationData* RenderStyle::transitionForProperty(CSSPropertyID property) const
{
    if (transitions()) {
        for (size_t i = 0; i < transitions()->size(); ++i) {
            const CSSAnimationData* p = transitions()->animation(i);
            if (p->animationMode() == CSSAnimationData::AnimateAll || p->property() == property) {
                return p;
            }
        }
    }
    return 0;
}

const Font& RenderStyle::font() const { return inherited->font; }
const FontMetrics& RenderStyle::fontMetrics() const { return inherited->font.fontMetrics(); }
const FontDescription& RenderStyle::fontDescription() const { return inherited->font.fontDescription(); }
float RenderStyle::specifiedFontSize() const { return fontDescription().specifiedSize(); }
float RenderStyle::computedFontSize() const { return fontDescription().computedSize(); }
int RenderStyle::fontSize() const { return fontDescription().computedPixelSize(); }
FontWeight RenderStyle::fontWeight() const { return fontDescription().weight(); }

float RenderStyle::wordSpacing() const { return fontDescription().wordSpacing(); }
float RenderStyle::letterSpacing() const { return fontDescription().letterSpacing(); }

bool RenderStyle::setFontDescription(const FontDescription& v)
{
    if (inherited->font.fontDescription() != v) {
        inherited.access()->font = Font(v);
        return true;
    }
    return false;
}

const Length& RenderStyle::specifiedLineHeight() const { return inherited->line_height; }
Length RenderStyle::lineHeight() const
{
    const Length& lh = inherited->line_height;
    // Unlike fontDescription().computedSize() and hence fontSize(), this is
    // recalculated on demand as we only store the specified line height.
    // FIXME: Should consider scaling the fixed part of any calc expressions
    // too, though this involves messily poking into CalcExpressionLength.
    float multiplier = textAutosizingMultiplier();
    if (multiplier > 1 && lh.isFixed())
        return Length(TextAutosizer::computeAutosizedFontSize(lh.value(), multiplier), Fixed);

    return lh;
}
void RenderStyle::setLineHeight(Length specifiedLineHeight) { SET_VAR(inherited, line_height, specifiedLineHeight); }

int RenderStyle::computedLineHeight() const
{
    const Length& lh = lineHeight();

    // Negative value means the line height is not set. Use the font's built-in spacing.
    if (lh.isNegative())
        return fontMetrics().lineSpacing();

    if (lh.isPercent())
        return minimumValueForLength(lh, fontSize());

    return lh.value();
}

void RenderStyle::setWordSpacing(float wordSpacing)
{
    FontSelector* currentFontSelector = font().fontSelector();
    FontDescription desc(fontDescription());
    desc.setWordSpacing(wordSpacing);
    setFontDescription(desc);
    font().update(currentFontSelector);
}

void RenderStyle::setLetterSpacing(float letterSpacing)
{
    FontSelector* currentFontSelector = font().fontSelector();
    FontDescription desc(fontDescription());
    desc.setLetterSpacing(letterSpacing);
    setFontDescription(desc);
    font().update(currentFontSelector);
}

void RenderStyle::setFontSize(float size)
{
    // size must be specifiedSize if Text Autosizing is enabled, but computedSize if text
    // zoom is enabled (if neither is enabled it's irrelevant as they're probably the same).

    ASSERT(std::isfinite(size));
    if (!std::isfinite(size) || size < 0)
        size = 0;
    else
        size = min(maximumAllowedFontSize, size);

    FontSelector* currentFontSelector = font().fontSelector();
    FontDescription desc(fontDescription());
    desc.setSpecifiedSize(size);
    desc.setComputedSize(size);

    float multiplier = textAutosizingMultiplier();
    if (multiplier > 1) {
        float autosizedFontSize = TextAutosizer::computeAutosizedFontSize(size, multiplier);
        desc.setComputedSize(min(maximumAllowedFontSize, autosizedFontSize));
    }

    setFontDescription(desc);
    font().update(currentFontSelector);
}

void RenderStyle::setFontWeight(FontWeight weight)
{
    FontSelector* currentFontSelector = font().fontSelector();
    FontDescription desc(fontDescription());
    desc.setWeight(weight);
    setFontDescription(desc);
    font().update(currentFontSelector);
}

void RenderStyle::getShadowExtent(const ShadowList* shadowList, LayoutUnit &top, LayoutUnit &right, LayoutUnit &bottom, LayoutUnit &left) const
{
    top = 0;
    right = 0;
    bottom = 0;
    left = 0;

    size_t shadowCount = shadowList ? shadowList->shadows().size() : 0;
    for (size_t i = 0; i < shadowCount; ++i) {
        const ShadowData& shadow = shadowList->shadows()[i];
        if (shadow.style() == Inset)
            continue;
        float blurAndSpread = shadow.blur() + shadow.spread();

        top = min<LayoutUnit>(top, shadow.y() - blurAndSpread);
        right = max<LayoutUnit>(right, shadow.x() + blurAndSpread);
        bottom = max<LayoutUnit>(bottom, shadow.y() + blurAndSpread);
        left = min<LayoutUnit>(left, shadow.x() - blurAndSpread);
    }
}

LayoutBoxExtent RenderStyle::getShadowInsetExtent(const ShadowList* shadowList) const
{
    LayoutUnit top = 0;
    LayoutUnit right = 0;
    LayoutUnit bottom = 0;
    LayoutUnit left = 0;

    size_t shadowCount = shadowList ? shadowList->shadows().size() : 0;
    for (size_t i = 0; i < shadowCount; ++i) {
        const ShadowData& shadow = shadowList->shadows()[i];
        if (shadow.style() == Normal)
            continue;
        float blurAndSpread = shadow.blur() + shadow.spread();
        top = max<LayoutUnit>(top, shadow.y() + blurAndSpread);
        right = min<LayoutUnit>(right, shadow.x() - blurAndSpread);
        bottom = min<LayoutUnit>(bottom, shadow.y() - blurAndSpread);
        left = max<LayoutUnit>(left, shadow.x() + blurAndSpread);
    }

    return LayoutBoxExtent(top, right, bottom, left);
}

void RenderStyle::getShadowHorizontalExtent(const ShadowList* shadowList, LayoutUnit &left, LayoutUnit &right) const
{
    left = 0;
    right = 0;

    size_t shadowCount = shadowList ? shadowList->shadows().size() : 0;
    for (size_t i = 0; i < shadowCount; ++i) {
        const ShadowData& shadow = shadowList->shadows()[i];
        if (shadow.style() == Inset)
            continue;
        float blurAndSpread = shadow.blur() + shadow.spread();

        left = min<LayoutUnit>(left, shadow.x() - blurAndSpread);
        right = max<LayoutUnit>(right, shadow.x() + blurAndSpread);
    }
}

void RenderStyle::getShadowVerticalExtent(const ShadowList* shadowList, LayoutUnit &top, LayoutUnit &bottom) const
{
    top = 0;
    bottom = 0;

    size_t shadowCount = shadowList ? shadowList->shadows().size() : 0;
    for (size_t i = 0; i < shadowCount; ++i) {
        const ShadowData& shadow = shadowList->shadows()[i];
        if (shadow.style() == Inset)
            continue;
        float blurAndSpread = shadow.blur() + shadow.spread();

        top = min<LayoutUnit>(top, shadow.y() - blurAndSpread);
        bottom = max<LayoutUnit>(bottom, shadow.y() + blurAndSpread);
    }
}

StyleColor RenderStyle::visitedDependentDecorationColor() const
{
    // Text decoration color fallback is handled in RenderObject::decorationColor.
    return insideLink() == InsideVisitedLink ? visitedLinkTextDecorationColor() : textDecorationColor();
}

Color RenderStyle::colorIncludingFallback(int colorProperty, bool visitedLink) const
{
    StyleColor result(StyleColor::currentColor());
    EBorderStyle borderStyle = BNONE;
    switch (colorProperty) {
    case CSSPropertyBackgroundColor:
        result = visitedLink ? visitedLinkBackgroundColor() : backgroundColor();
        break;
    case CSSPropertyBorderLeftColor:
        result = visitedLink ? visitedLinkBorderLeftColor() : borderLeftColor();
        borderStyle = borderLeftStyle();
        break;
    case CSSPropertyBorderRightColor:
        result = visitedLink ? visitedLinkBorderRightColor() : borderRightColor();
        borderStyle = borderRightStyle();
        break;
    case CSSPropertyBorderTopColor:
        result = visitedLink ? visitedLinkBorderTopColor() : borderTopColor();
        borderStyle = borderTopStyle();
        break;
    case CSSPropertyBorderBottomColor:
        result = visitedLink ? visitedLinkBorderBottomColor() : borderBottomColor();
        borderStyle = borderBottomStyle();
        break;
    case CSSPropertyColor:
        result = visitedLink ? visitedLinkColor() : color();
        break;
    case CSSPropertyOutlineColor:
        result = visitedLink ? visitedLinkOutlineColor() : outlineColor();
        break;
    case CSSPropertyWebkitColumnRuleColor:
        result = visitedLink ? visitedLinkColumnRuleColor() : columnRuleColor();
        break;
    case CSSPropertyWebkitTextEmphasisColor:
        result = visitedLink ? visitedLinkTextEmphasisColor() : textEmphasisColor();
        break;
    case CSSPropertyWebkitTextFillColor:
        result = visitedLink ? visitedLinkTextFillColor() : textFillColor();
        break;
    case CSSPropertyWebkitTextStrokeColor:
        result = visitedLink ? visitedLinkTextStrokeColor() : textStrokeColor();
        break;
    case CSSPropertyFloodColor:
        result = floodColor();
        break;
    case CSSPropertyLightingColor:
        result = lightingColor();
        break;
    case CSSPropertyStopColor:
        result = stopColor();
        break;
    case CSSPropertyWebkitTapHighlightColor:
        result = tapHighlightColor();
        break;
    default:
        ASSERT_NOT_REACHED();
        break;
    }

    if (!result.isCurrentColor())
        return result.color();

    // FIXME: Treating styled borders with initial color differently causes problems
    // See crbug.com/316559, crbug.com/276231
    if (!visitedLink && (borderStyle == INSET || borderStyle == OUTSET || borderStyle == RIDGE || borderStyle == GROOVE))
        return Color(238, 238, 238);
    return visitedLink ? visitedLinkColor() : color();
}

Color RenderStyle::visitedDependentColor(int colorProperty) const
{
    Color unvisitedColor = colorIncludingFallback(colorProperty, false);
    if (insideLink() != InsideVisitedLink)
        return unvisitedColor;

    Color visitedColor = colorIncludingFallback(colorProperty, true);

    // FIXME: Technically someone could explicitly specify the color transparent, but for now we'll just
    // assume that if the background color is transparent that it wasn't set. Note that it's weird that
    // we're returning unvisited info for a visited link, but given our restriction that the alpha values
    // have to match, it makes more sense to return the unvisited background color if specified than it
    // does to return black. This behavior matches what Firefox 4 does as well.
    if (colorProperty == CSSPropertyBackgroundColor && visitedColor == Color::transparent)
        return unvisitedColor;

    // Take the alpha from the unvisited color, but get the RGB values from the visited color.
    return Color(visitedColor.red(), visitedColor.green(), visitedColor.blue(), unvisitedColor.alpha());
}

const BorderValue& RenderStyle::borderBefore() const
{
    switch (writingMode()) {
    case TopToBottomWritingMode:
        return borderTop();
    case BottomToTopWritingMode:
        return borderBottom();
    case LeftToRightWritingMode:
        return borderLeft();
    case RightToLeftWritingMode:
        return borderRight();
    }
    ASSERT_NOT_REACHED();
    return borderTop();
}

const BorderValue& RenderStyle::borderAfter() const
{
    switch (writingMode()) {
    case TopToBottomWritingMode:
        return borderBottom();
    case BottomToTopWritingMode:
        return borderTop();
    case LeftToRightWritingMode:
        return borderRight();
    case RightToLeftWritingMode:
        return borderLeft();
    }
    ASSERT_NOT_REACHED();
    return borderBottom();
}

const BorderValue& RenderStyle::borderStart() const
{
    if (isHorizontalWritingMode())
        return isLeftToRightDirection() ? borderLeft() : borderRight();
    return isLeftToRightDirection() ? borderTop() : borderBottom();
}

const BorderValue& RenderStyle::borderEnd() const
{
    if (isHorizontalWritingMode())
        return isLeftToRightDirection() ? borderRight() : borderLeft();
    return isLeftToRightDirection() ? borderBottom() : borderTop();
}

unsigned short RenderStyle::borderBeforeWidth() const
{
    switch (writingMode()) {
    case TopToBottomWritingMode:
        return borderTopWidth();
    case BottomToTopWritingMode:
        return borderBottomWidth();
    case LeftToRightWritingMode:
        return borderLeftWidth();
    case RightToLeftWritingMode:
        return borderRightWidth();
    }
    ASSERT_NOT_REACHED();
    return borderTopWidth();
}

unsigned short RenderStyle::borderAfterWidth() const
{
    switch (writingMode()) {
    case TopToBottomWritingMode:
        return borderBottomWidth();
    case BottomToTopWritingMode:
        return borderTopWidth();
    case LeftToRightWritingMode:
        return borderRightWidth();
    case RightToLeftWritingMode:
        return borderLeftWidth();
    }
    ASSERT_NOT_REACHED();
    return borderBottomWidth();
}

unsigned short RenderStyle::borderStartWidth() const
{
    if (isHorizontalWritingMode())
        return isLeftToRightDirection() ? borderLeftWidth() : borderRightWidth();
    return isLeftToRightDirection() ? borderTopWidth() : borderBottomWidth();
}

unsigned short RenderStyle::borderEndWidth() const
{
    if (isHorizontalWritingMode())
        return isLeftToRightDirection() ? borderRightWidth() : borderLeftWidth();
    return isLeftToRightDirection() ? borderBottomWidth() : borderTopWidth();
}

void RenderStyle::setMarginStart(Length margin)
{
    if (isHorizontalWritingMode()) {
        if (isLeftToRightDirection())
            setMarginLeft(margin);
        else
            setMarginRight(margin);
    } else {
        if (isLeftToRightDirection())
            setMarginTop(margin);
        else
            setMarginBottom(margin);
    }
}

void RenderStyle::setMarginEnd(Length margin)
{
    if (isHorizontalWritingMode()) {
        if (isLeftToRightDirection())
            setMarginRight(margin);
        else
            setMarginLeft(margin);
    } else {
        if (isLeftToRightDirection())
            setMarginBottom(margin);
        else
            setMarginTop(margin);
    }
}

TextEmphasisMark RenderStyle::textEmphasisMark() const
{
    TextEmphasisMark mark = static_cast<TextEmphasisMark>(rareInheritedData->textEmphasisMark);
    if (mark != TextEmphasisMarkAuto)
        return mark;

    if (isHorizontalWritingMode())
        return TextEmphasisMarkDot;

    return TextEmphasisMarkSesame;
}

Color RenderStyle::initialTapHighlightColor()
{
    return RenderTheme::tapHighlightColor();
}

LayoutBoxExtent RenderStyle::imageOutsets(const NinePieceImage& image) const
{
    return LayoutBoxExtent(NinePieceImage::computeOutset(image.outset().top(), borderTopWidth()),
                           NinePieceImage::computeOutset(image.outset().right(), borderRightWidth()),
                           NinePieceImage::computeOutset(image.outset().bottom(), borderBottomWidth()),
                           NinePieceImage::computeOutset(image.outset().left(), borderLeftWidth()));
}

void RenderStyle::setBorderImageSource(PassRefPtr<StyleImage> image)
{
    if (surround->border.m_image.image() == image.get())
        return;
    surround.access()->border.m_image.setImage(image);
}

void RenderStyle::setBorderImageSlices(LengthBox slices)
{
    if (surround->border.m_image.imageSlices() == slices)
        return;
    surround.access()->border.m_image.setImageSlices(slices);
}

void RenderStyle::setBorderImageWidth(const BorderImageLengthBox& slices)
{
    if (surround->border.m_image.borderSlices() == slices)
        return;
    surround.access()->border.m_image.setBorderSlices(slices);
}

void RenderStyle::setBorderImageOutset(const BorderImageLengthBox& outset)
{
    if (surround->border.m_image.outset() == outset)
        return;
    surround.access()->border.m_image.setOutset(outset);
}

float calcBorderRadiiConstraintScaleFor(const FloatRect& rect, const FloatRoundedRect::Radii& radii)
{
    // Constrain corner radii using CSS3 rules:
    // http://www.w3.org/TR/css3-background/#the-border-radius

    float factor = 1;
    float radiiSum;

    // top
    radiiSum = radii.topLeft().width() + radii.topRight().width(); // Casts to avoid integer overflow.
    if (radiiSum > rect.width())
        factor = std::min(rect.width() / radiiSum, factor);

    // bottom
    radiiSum = radii.bottomLeft().width() + radii.bottomRight().width();
    if (radiiSum > rect.width())
        factor = std::min(rect.width() / radiiSum, factor);

    // left
    radiiSum = radii.topLeft().height() + radii.bottomLeft().height();
    if (radiiSum > rect.height())
        factor = std::min(rect.height() / radiiSum, factor);

    // right
    radiiSum = radii.topRight().height() + radii.bottomRight().height();
    if (radiiSum > rect.height())
        factor = std::min(rect.height() / radiiSum, factor);

    ASSERT(factor <= 1);
    return factor;
}

} // namespace WebCore
/* [<][>][^][v][top][bottom][index][help] */
root/Source/core/rendering/style/RenderStyle.cpp

DEFINITIONS
