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RenderStyle.cpp
2418 lines (2055 loc) · 88.8 KB
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RenderStyle.cpp
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/*
* Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2004-2017 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 "RenderStyle.h"
#include "ContentData.h"
#include "CSSCustomPropertyValue.h"
#include "CSSParser.h"
#include "CSSPropertyNames.h"
#include "CursorList.h"
#include "FloatRoundedRect.h"
#include "FontCascade.h"
#include "FontSelector.h"
#include "InlineTextBoxStyle.h"
#include "Pagination.h"
#include "QuotesData.h"
#include "RenderObject.h"
#include "RenderTheme.h"
#include "RuntimeEnabledFeatures.h"
#include "ScaleTransformOperation.h"
#include "ShadowData.h"
#include "StyleBuilderConverter.h"
#include "StyleImage.h"
#include "StyleInheritedData.h"
#include "StyleResolver.h"
#include "StyleScrollSnapPoints.h"
#include "StyleSelfAlignmentData.h"
#include "StyleTreeResolver.h"
#include "WillChangeData.h"
#include <wtf/MathExtras.h>
#include <wtf/PointerComparison.h>
#include <wtf/StdLibExtras.h>
#include <algorithm>
#if ENABLE(TEXT_AUTOSIZING)
#include <wtf/text/StringHash.h>
#endif
namespace WebCore {
struct SameSizeAsBorderValue {
Color m_color;
float m_width;
int m_restBits;
};
COMPILE_ASSERT(sizeof(BorderValue) == sizeof(SameSizeAsBorderValue), BorderValue_should_not_grow);
struct SameSizeAsRenderStyle {
void* dataRefs[7];
void* ownPtrs[1];
void* dataRefSvgStyle;
struct InheritedFlags {
unsigned m_bitfields[2];
} m_inheritedFlags;
struct NonInheritedFlags {
unsigned m_bitfields[2];
} m_nonInheritedFlags;
#if !ASSERT_DISABLED || ENABLE(SECURITY_ASSERTIONS)
bool deletionCheck;
#endif
};
static_assert(sizeof(RenderStyle) == sizeof(SameSizeAsRenderStyle), "RenderStyle should stay small");
RenderStyle& RenderStyle::defaultStyle()
{
static NeverDestroyed<RenderStyle> style { CreateDefaultStyle };
return style;
}
RenderStyle RenderStyle::create()
{
return clone(defaultStyle());
}
std::unique_ptr<RenderStyle> RenderStyle::createPtr()
{
return clonePtr(defaultStyle());
}
RenderStyle RenderStyle::clone(const RenderStyle& style)
{
return RenderStyle(style, Clone);
}
std::unique_ptr<RenderStyle> RenderStyle::clonePtr(const RenderStyle& style)
{
return std::make_unique<RenderStyle>(style, Clone);
}
RenderStyle RenderStyle::createAnonymousStyleWithDisplay(const RenderStyle& parentStyle, DisplayType display)
{
auto newStyle = create();
newStyle.inheritFrom(parentStyle);
newStyle.inheritUnicodeBidiFrom(&parentStyle);
newStyle.setDisplay(display);
return newStyle;
}
RenderStyle RenderStyle::createStyleInheritingFromPseudoStyle(const RenderStyle& pseudoStyle)
{
ASSERT(pseudoStyle.styleType() == PseudoId::Before || pseudoStyle.styleType() == PseudoId::After);
auto style = create();
style.inheritFrom(pseudoStyle);
return style;
}
RenderStyle::RenderStyle(RenderStyle&&) = default;
RenderStyle& RenderStyle::operator=(RenderStyle&&) = default;
RenderStyle::RenderStyle(CreateDefaultStyleTag)
: m_boxData(StyleBoxData::create())
, m_visualData(StyleVisualData::create())
, m_backgroundData(StyleBackgroundData::create())
, m_surroundData(StyleSurroundData::create())
, m_rareNonInheritedData(StyleRareNonInheritedData::create())
, m_rareInheritedData(StyleRareInheritedData::create())
, m_inheritedData(StyleInheritedData::create())
, m_svgStyle(SVGRenderStyle::create())
{
m_inheritedFlags.emptyCells = static_cast<unsigned>(initialEmptyCells());
m_inheritedFlags.captionSide = static_cast<unsigned>(initialCaptionSide());
m_inheritedFlags.listStyleType = static_cast<unsigned>(initialListStyleType());
m_inheritedFlags.listStylePosition = static_cast<unsigned>(initialListStylePosition());
m_inheritedFlags.visibility = static_cast<unsigned>(initialVisibility());
m_inheritedFlags.textAlign = static_cast<unsigned>(initialTextAlign());
m_inheritedFlags.textTransform = static_cast<unsigned>(initialTextTransform());
m_inheritedFlags.textDecorations = initialTextDecoration().toRaw();
m_inheritedFlags.cursor = static_cast<unsigned>(initialCursor());
#if ENABLE(CURSOR_VISIBILITY)
m_inheritedFlags.cursorVisibility = static_cast<unsigned>(initialCursorVisibility());
#endif
m_inheritedFlags.direction = static_cast<unsigned>(initialDirection());
m_inheritedFlags.whiteSpace = static_cast<unsigned>(initialWhiteSpace());
m_inheritedFlags.borderCollapse = static_cast<unsigned>(initialBorderCollapse());
m_inheritedFlags.rtlOrdering = static_cast<unsigned>(initialRTLOrdering());
m_inheritedFlags.boxDirection = static_cast<unsigned>(initialBoxDirection());
m_inheritedFlags.printColorAdjust = static_cast<unsigned>(initialPrintColorAdjust());
m_inheritedFlags.pointerEvents = static_cast<unsigned>(initialPointerEvents());
m_inheritedFlags.insideLink = static_cast<unsigned>(InsideLink::NotInside);
m_inheritedFlags.insideDefaultButton = false;
m_inheritedFlags.writingMode = initialWritingMode();
m_nonInheritedFlags.effectiveDisplay = static_cast<unsigned>(initialDisplay());
m_nonInheritedFlags.originalDisplay = static_cast<unsigned>(initialDisplay());
m_nonInheritedFlags.overflowX = static_cast<unsigned>(initialOverflowX());
m_nonInheritedFlags.overflowY = static_cast<unsigned>(initialOverflowY());
m_nonInheritedFlags.verticalAlign = static_cast<unsigned>(initialVerticalAlign());
m_nonInheritedFlags.clear = static_cast<unsigned>(initialClear());
m_nonInheritedFlags.position = static_cast<unsigned>(initialPosition());
m_nonInheritedFlags.unicodeBidi = initialUnicodeBidi();
m_nonInheritedFlags.floating = static_cast<unsigned>(initialFloating());
m_nonInheritedFlags.tableLayout = static_cast<unsigned>(initialTableLayout());
m_nonInheritedFlags.hasExplicitlySetDirection = false;
m_nonInheritedFlags.hasExplicitlySetWritingMode = false;
m_nonInheritedFlags.hasExplicitlySetTextAlign = false;
m_nonInheritedFlags.hasViewportUnits = false;
m_nonInheritedFlags.hasExplicitlyInheritedProperties = false;
m_nonInheritedFlags.isUnique = false;
m_nonInheritedFlags.emptyState = false;
m_nonInheritedFlags.firstChildState = false;
m_nonInheritedFlags.lastChildState = false;
m_nonInheritedFlags.affectedByHover = false;
m_nonInheritedFlags.affectedByActive = false;
m_nonInheritedFlags.affectedByDrag = false;
m_nonInheritedFlags.isLink = false;
m_nonInheritedFlags.styleType = static_cast<unsigned>(PseudoId::None);
m_nonInheritedFlags.pseudoBits = static_cast<unsigned>(PseudoId::None);
static_assert((sizeof(InheritedFlags) <= 8), "InheritedFlags does not grow");
static_assert((sizeof(NonInheritedFlags) <= 8), "NonInheritedFlags does not grow");
}
inline RenderStyle::RenderStyle(const RenderStyle& other, CloneTag)
: m_boxData(other.m_boxData)
, m_visualData(other.m_visualData)
, m_backgroundData(other.m_backgroundData)
, m_surroundData(other.m_surroundData)
, m_rareNonInheritedData(other.m_rareNonInheritedData)
, m_nonInheritedFlags(other.m_nonInheritedFlags)
, m_rareInheritedData(other.m_rareInheritedData)
, m_inheritedData(other.m_inheritedData)
, m_inheritedFlags(other.m_inheritedFlags)
, m_svgStyle(other.m_svgStyle)
{
}
inline RenderStyle::RenderStyle(RenderStyle& a, RenderStyle&& b)
: m_boxData(a.m_boxData.replace(WTFMove(b.m_boxData)))
, m_visualData(a.m_visualData.replace(WTFMove(b.m_visualData)))
, m_backgroundData(a.m_backgroundData.replace(WTFMove(b.m_backgroundData)))
, m_surroundData(a.m_surroundData.replace(WTFMove(b.m_surroundData)))
, m_rareNonInheritedData(a.m_rareNonInheritedData.replace(WTFMove(b.m_rareNonInheritedData)))
, m_nonInheritedFlags(std::exchange(a.m_nonInheritedFlags, b.m_nonInheritedFlags))
, m_rareInheritedData(a.m_rareInheritedData.replace(WTFMove(b.m_rareInheritedData)))
, m_inheritedData(a.m_inheritedData.replace(WTFMove(b.m_inheritedData)))
, m_inheritedFlags(std::exchange(a.m_inheritedFlags, b.m_inheritedFlags))
, m_cachedPseudoStyles(std::exchange(a.m_cachedPseudoStyles, WTFMove(b.m_cachedPseudoStyles)))
, m_svgStyle(a.m_svgStyle.replace(WTFMove(b.m_svgStyle)))
{
}
RenderStyle::~RenderStyle()
{
#if !ASSERT_DISABLED || ENABLE(SECURITY_ASSERTIONS)
ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
m_deletionHasBegun = true;
#endif
}
RenderStyle RenderStyle::replace(RenderStyle&& newStyle)
{
return RenderStyle { *this, WTFMove(newStyle) };
}
static StyleSelfAlignmentData resolvedSelfAlignment(const StyleSelfAlignmentData& value, ItemPosition normalValueBehavior)
{
if (value.position() == ItemPosition::Legacy || value.position() == ItemPosition::Normal || value.position() == ItemPosition::Auto)
return { normalValueBehavior, OverflowAlignment::Default };
return value;
}
StyleSelfAlignmentData RenderStyle::resolvedAlignItems(ItemPosition normalValueBehaviour) const
{
return resolvedSelfAlignment(alignItems(), normalValueBehaviour);
}
StyleSelfAlignmentData RenderStyle::resolvedAlignSelf(const RenderStyle* parentStyle, ItemPosition normalValueBehaviour) const
{
// The auto keyword computes to the parent's align-items computed value.
// We will return the behaviour of 'normal' value if needed, which is specific of each layout model.
if (!parentStyle || alignSelf().position() != ItemPosition::Auto)
return resolvedSelfAlignment(alignSelf(), normalValueBehaviour);
return parentStyle->resolvedAlignItems(normalValueBehaviour);
}
StyleSelfAlignmentData RenderStyle::resolvedJustifyItems(ItemPosition normalValueBehaviour) const
{
return resolvedSelfAlignment(justifyItems(), normalValueBehaviour);
}
StyleSelfAlignmentData RenderStyle::resolvedJustifySelf(const RenderStyle* parentStyle, ItemPosition normalValueBehaviour) const
{
// The auto keyword computes to the parent's justify-items computed value.
// We will return the behaviour of 'normal' value if needed, which is specific of each layout model.
if (!parentStyle || justifySelf().position() != ItemPosition::Auto)
return resolvedSelfAlignment(justifySelf(), normalValueBehaviour);
return parentStyle->resolvedJustifyItems(normalValueBehaviour);
}
static inline StyleContentAlignmentData resolvedContentAlignment(const StyleContentAlignmentData& value, const StyleContentAlignmentData& normalValueBehavior)
{
return (value.position() == ContentPosition::Normal && value.distribution() == ContentDistribution::Default) ? normalValueBehavior : value;
}
StyleContentAlignmentData RenderStyle::resolvedAlignContent(const StyleContentAlignmentData& normalValueBehavior) const
{
// We will return the behaviour of 'normal' value if needed, which is specific of each layout model.
return resolvedContentAlignment(alignContent(), normalValueBehavior);
}
StyleContentAlignmentData RenderStyle::resolvedJustifyContent(const StyleContentAlignmentData& normalValueBehavior) const
{
// We will return the behaviour of 'normal' value if needed, which is specific of each layout model.
return resolvedContentAlignment(justifyContent(), normalValueBehavior);
}
static inline ContentPosition resolvedContentAlignmentPosition(const StyleContentAlignmentData& value, const StyleContentAlignmentData& normalValueBehavior)
{
return (value.position() == ContentPosition::Normal && value.distribution() == ContentDistribution::Default) ? normalValueBehavior.position() : value.position();
}
static inline ContentDistribution resolvedContentAlignmentDistribution(const StyleContentAlignmentData& value, const StyleContentAlignmentData& normalValueBehavior)
{
return (value.position() == ContentPosition::Normal && value.distribution() == ContentDistribution::Default) ? normalValueBehavior.distribution() : value.distribution();
}
ContentPosition RenderStyle::resolvedJustifyContentPosition(const StyleContentAlignmentData& normalValueBehavior) const
{
return resolvedContentAlignmentPosition(justifyContent(), normalValueBehavior);
}
ContentDistribution RenderStyle::resolvedJustifyContentDistribution(const StyleContentAlignmentData& normalValueBehavior) const
{
return resolvedContentAlignmentDistribution(justifyContent(), normalValueBehavior);
}
ContentPosition RenderStyle::resolvedAlignContentPosition(const StyleContentAlignmentData& normalValueBehavior) const
{
return resolvedContentAlignmentPosition(alignContent(), normalValueBehavior);
}
ContentDistribution RenderStyle::resolvedAlignContentDistribution(const StyleContentAlignmentData& normalValueBehavior) const
{
return resolvedContentAlignmentDistribution(alignContent(), normalValueBehavior);
}
void RenderStyle::inheritFrom(const RenderStyle& inheritParent)
{
m_rareInheritedData = inheritParent.m_rareInheritedData;
m_inheritedData = inheritParent.m_inheritedData;
m_inheritedFlags = inheritParent.m_inheritedFlags;
if (m_svgStyle != inheritParent.m_svgStyle)
m_svgStyle.access().inheritFrom(inheritParent.m_svgStyle.get());
}
void RenderStyle::copyNonInheritedFrom(const RenderStyle& other)
{
m_boxData = other.m_boxData;
m_visualData = other.m_visualData;
m_backgroundData = other.m_backgroundData;
m_surroundData = other.m_surroundData;
m_rareNonInheritedData = other.m_rareNonInheritedData;
m_nonInheritedFlags.copyNonInheritedFrom(other.m_nonInheritedFlags);
if (m_svgStyle != other.m_svgStyle)
m_svgStyle.access().copyNonInheritedFrom(other.m_svgStyle.get());
ASSERT(zoom() == initialZoom());
}
void RenderStyle::copyContentFrom(const RenderStyle& other)
{
if (!other.m_rareNonInheritedData->content)
return;
m_rareNonInheritedData.access().content = other.m_rareNonInheritedData->content->clone();
}
bool RenderStyle::operator==(const RenderStyle& other) const
{
// compare everything except the pseudoStyle pointer
return m_inheritedFlags == other.m_inheritedFlags
&& m_nonInheritedFlags == other.m_nonInheritedFlags
&& m_boxData == other.m_boxData
&& m_visualData == other.m_visualData
&& m_backgroundData == other.m_backgroundData
&& m_surroundData == other.m_surroundData
&& m_rareNonInheritedData == other.m_rareNonInheritedData
&& m_rareInheritedData == other.m_rareInheritedData
&& m_inheritedData == other.m_inheritedData
&& m_svgStyle == other.m_svgStyle;
}
bool RenderStyle::hasUniquePseudoStyle() const
{
if (!m_cachedPseudoStyles || styleType() != PseudoId::None)
return false;
for (auto& pseudoStyle : *m_cachedPseudoStyles) {
if (pseudoStyle->unique())
return true;
}
return false;
}
RenderStyle* RenderStyle::getCachedPseudoStyle(PseudoId pid) const
{
if (!m_cachedPseudoStyles || !m_cachedPseudoStyles->size())
return nullptr;
if (styleType() != PseudoId::None)
return nullptr;
for (auto& pseudoStyle : *m_cachedPseudoStyles) {
if (pseudoStyle->styleType() == pid)
return pseudoStyle.get();
}
return nullptr;
}
RenderStyle* RenderStyle::addCachedPseudoStyle(std::unique_ptr<RenderStyle> pseudo)
{
if (!pseudo)
return nullptr;
ASSERT(pseudo->styleType() > PseudoId::None);
RenderStyle* result = pseudo.get();
if (!m_cachedPseudoStyles)
m_cachedPseudoStyles = std::make_unique<PseudoStyleCache>();
m_cachedPseudoStyles->append(WTFMove(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 m_inheritedFlags != other->m_inheritedFlags
|| m_inheritedData != other->m_inheritedData
|| m_svgStyle->inheritedNotEqual(other->m_svgStyle)
|| m_rareInheritedData != other->m_rareInheritedData;
}
#if ENABLE(TEXT_AUTOSIZING)
static inline unsigned computeFontHash(const FontCascade& font)
{
IntegerHasher hasher;
hasher.add(ASCIICaseInsensitiveHash::hash(font.fontDescription().firstFamily()));
hasher.add(font.fontDescription().specifiedSize());
return hasher.hash();
}
unsigned RenderStyle::hashForTextAutosizing() const
{
// FIXME: Not a very smart hash. Could be improved upon. See <https://bugs.webkit.org/show_bug.cgi?id=121131>.
unsigned hash = m_rareNonInheritedData->appearance;
hash ^= m_rareNonInheritedData->marginBeforeCollapse;
hash ^= m_rareNonInheritedData->marginAfterCollapse;
hash ^= m_rareNonInheritedData->lineClamp.value();
hash ^= m_rareInheritedData->overflowWrap;
hash ^= m_rareInheritedData->nbspMode;
hash ^= m_rareInheritedData->lineBreak;
hash ^= WTF::FloatHash<float>::hash(m_inheritedData->specifiedLineHeight.value());
hash ^= computeFontHash(m_inheritedData->fontCascade);
hash ^= WTF::FloatHash<float>::hash(m_inheritedData->horizontalBorderSpacing);
hash ^= WTF::FloatHash<float>::hash(m_inheritedData->verticalBorderSpacing);
hash ^= m_inheritedFlags.boxDirection;
hash ^= m_inheritedFlags.rtlOrdering;
hash ^= m_nonInheritedFlags.position;
hash ^= m_nonInheritedFlags.floating;
hash ^= m_rareNonInheritedData->textOverflow;
hash ^= m_rareInheritedData->textSecurity;
return hash;
}
bool RenderStyle::equalForTextAutosizing(const RenderStyle& other) const
{
return m_rareNonInheritedData->appearance == other.m_rareNonInheritedData->appearance
&& m_rareNonInheritedData->marginBeforeCollapse == other.m_rareNonInheritedData->marginBeforeCollapse
&& m_rareNonInheritedData->marginAfterCollapse == other.m_rareNonInheritedData->marginAfterCollapse
&& m_rareNonInheritedData->lineClamp == other.m_rareNonInheritedData->lineClamp
&& m_rareInheritedData->textSizeAdjust == other.m_rareInheritedData->textSizeAdjust
&& m_rareInheritedData->overflowWrap == other.m_rareInheritedData->overflowWrap
&& m_rareInheritedData->nbspMode == other.m_rareInheritedData->nbspMode
&& m_rareInheritedData->lineBreak == other.m_rareInheritedData->lineBreak
&& m_rareInheritedData->textSecurity == other.m_rareInheritedData->textSecurity
&& m_inheritedData->specifiedLineHeight == other.m_inheritedData->specifiedLineHeight
&& m_inheritedData->fontCascade.equalForTextAutoSizing(other.m_inheritedData->fontCascade)
&& m_inheritedData->horizontalBorderSpacing == other.m_inheritedData->horizontalBorderSpacing
&& m_inheritedData->verticalBorderSpacing == other.m_inheritedData->verticalBorderSpacing
&& m_inheritedFlags.boxDirection == other.m_inheritedFlags.boxDirection
&& m_inheritedFlags.rtlOrdering == other.m_inheritedFlags.rtlOrdering
&& m_nonInheritedFlags.position == other.m_nonInheritedFlags.position
&& m_nonInheritedFlags.floating == other.m_nonInheritedFlags.floating
&& m_rareNonInheritedData->textOverflow == other.m_rareNonInheritedData->textOverflow;
}
#endif // ENABLE(TEXT_AUTOSIZING)
bool RenderStyle::inheritedDataShared(const RenderStyle* other) const
{
// This is a fast check that only looks if the data structures are shared.
return m_inheritedFlags == other->m_inheritedFlags
&& m_inheritedData.ptr() == other->m_inheritedData.ptr()
&& m_svgStyle.ptr() == other->m_svgStyle.ptr()
&& m_rareInheritedData.ptr() == other->m_rareInheritedData.ptr();
}
static bool positionChangeIsMovementOnly(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 then this
// is not just a movement - we need to resize to our container.
if ((!a.left().isIntrinsicOrAuto() || !a.right().isIntrinsicOrAuto()) && width.isIntrinsicOrAuto())
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;
}
inline bool RenderStyle::changeAffectsVisualOverflow(const RenderStyle& other) const
{
if (m_rareNonInheritedData.ptr() != other.m_rareNonInheritedData.ptr()
&& !arePointingToEqualData(m_rareNonInheritedData->boxShadow, other.m_rareNonInheritedData->boxShadow))
return true;
if (m_rareInheritedData.ptr() != other.m_rareInheritedData.ptr()
&& !arePointingToEqualData(m_rareInheritedData->textShadow, other.m_rareInheritedData->textShadow))
return true;
if (m_inheritedFlags.textDecorations != other.m_inheritedFlags.textDecorations
|| m_rareNonInheritedData->textDecorationStyle != other.m_rareNonInheritedData->textDecorationStyle
|| m_rareInheritedData->textDecorationThickness != other.m_rareInheritedData->textDecorationThickness
|| m_rareInheritedData->textUnderlineOffset != other.m_rareInheritedData->textUnderlineOffset
|| m_rareInheritedData->textUnderlinePosition != other.m_rareInheritedData->textUnderlinePosition) {
return true;
}
if (hasOutlineInVisualOverflow() != other.hasOutlineInVisualOverflow())
return true;
return false;
}
static bool rareNonInheritedDataChangeRequiresLayout(const StyleRareNonInheritedData& first, const StyleRareNonInheritedData& second, OptionSet<StyleDifferenceContextSensitiveProperty>& changedContextSensitiveProperties)
{
ASSERT(&first != &second);
if (first.appearance != second.appearance
|| first.marginBeforeCollapse != second.marginBeforeCollapse
|| first.marginAfterCollapse != second.marginAfterCollapse
|| first.lineClamp != second.lineClamp
|| first.initialLetter != second.initialLetter
|| first.textOverflow != second.textOverflow)
return true;
if (first.shapeMargin != second.shapeMargin)
return true;
if (first.deprecatedFlexibleBox != second.deprecatedFlexibleBox)
return true;
if (first.flexibleBox != second.flexibleBox)
return true;
if (first.order != second.order
|| first.alignContent != second.alignContent
|| first.alignItems != second.alignItems
|| first.alignSelf != second.alignSelf
|| first.justifyContent != second.justifyContent
|| first.justifyItems != second.justifyItems
|| first.justifySelf != second.justifySelf)
return true;
if (!arePointingToEqualData(first.boxReflect, second.boxReflect))
return true;
if (first.multiCol != second.multiCol)
return true;
if (first.transform.ptr() != second.transform.ptr()) {
if (first.transform->hasTransform() != second.transform->hasTransform())
return true;
if (*first.transform != *second.transform) {
changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::Transform);
// Don't return; keep looking for another change
}
}
if (first.grid != second.grid
|| first.gridItem != second.gridItem)
return true;
#if ENABLE(DASHBOARD_SUPPORT)
// If regions change, trigger a relayout to re-calc regions.
if (first.dashboardRegions != second.dashboardRegions)
return true;
#endif
if (!arePointingToEqualData(first.willChange, second.willChange)) {
changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::WillChange);
// Don't return; keep looking for another change
}
if (first.textCombine != second.textCombine)
return true;
if (first.breakBefore != second.breakBefore
|| first.breakAfter != second.breakAfter
|| first.breakInside != second.breakInside)
return true;
if (first.hasOpacity() != second.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 true;
}
#if ENABLE(CSS_COMPOSITING)
if (first.isolation != second.isolation) {
// Ideally this would trigger a cheaper layout that just updates layer z-order trees (webit.org/b/190088).
return true;
}
#endif
if (first.hasFilters() != second.hasFilters())
return true;
#if ENABLE(FILTERS_LEVEL_2)
if (first.hasBackdropFilters() != second.hasBackdropFilters())
return true;
#endif
return false;
}
static bool rareInheritedDataChangeRequiresLayout(const StyleRareInheritedData& first, const StyleRareInheritedData& second)
{
ASSERT(&first != &second);
if (first.indent != second.indent
#if ENABLE(CSS3_TEXT)
|| first.textAlignLast != second.textAlignLast
|| first.textJustify != second.textJustify
|| first.textIndentLine != second.textIndentLine
#endif
|| first.effectiveZoom != second.effectiveZoom
|| first.textZoom != second.textZoom
#if ENABLE(TEXT_AUTOSIZING)
|| first.textSizeAdjust != second.textSizeAdjust
#endif
|| first.wordBreak != second.wordBreak
|| first.overflowWrap != second.overflowWrap
|| first.nbspMode != second.nbspMode
|| first.lineBreak != second.lineBreak
|| first.textSecurity != second.textSecurity
|| first.hyphens != second.hyphens
|| first.hyphenationLimitBefore != second.hyphenationLimitBefore
|| first.hyphenationLimitAfter != second.hyphenationLimitAfter
|| first.hyphenationString != second.hyphenationString
|| first.rubyPosition != second.rubyPosition
|| first.textEmphasisMark != second.textEmphasisMark
|| first.textEmphasisPosition != second.textEmphasisPosition
|| first.textEmphasisCustomMark != second.textEmphasisCustomMark
|| first.textOrientation != second.textOrientation
|| first.tabSize != second.tabSize
|| first.lineBoxContain != second.lineBoxContain
|| first.lineGrid != second.lineGrid
#if ENABLE(CSS_IMAGE_ORIENTATION)
|| first.imageOrientation != second.imageOrientation
#endif
#if ENABLE(CSS_IMAGE_RESOLUTION)
|| first.imageResolutionSource != second.imageResolutionSource
|| first.imageResolutionSnap != second.imageResolutionSnap
|| first.imageResolution != second.imageResolution
#endif
|| first.lineSnap != second.lineSnap
|| first.lineAlign != second.lineAlign
|| first.hangingPunctuation != second.hangingPunctuation
#if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
|| first.useTouchOverflowScrolling != second.useTouchOverflowScrolling
#endif
|| first.listStyleImage != second.listStyleImage) // FIXME: needs arePointingToEqualData()?
return true;
if (first.textStrokeWidth != second.textStrokeWidth)
return true;
// These properties affect the cached stroke bounding box rects.
if (first.capStyle != second.capStyle
|| first.joinStyle != second.joinStyle
|| first.strokeWidth != second.strokeWidth
|| first.miterLimit != second.miterLimit)
return true;
if (!arePointingToEqualData(first.quotes, second.quotes))
return true;
return false;
}
bool RenderStyle::changeRequiresLayout(const RenderStyle& other, OptionSet<StyleDifferenceContextSensitiveProperty>& changedContextSensitiveProperties) const
{
if (m_boxData.ptr() != other.m_boxData.ptr()) {
if (m_boxData->width() != other.m_boxData->width()
|| m_boxData->minWidth() != other.m_boxData->minWidth()
|| m_boxData->maxWidth() != other.m_boxData->maxWidth()
|| m_boxData->height() != other.m_boxData->height()
|| m_boxData->minHeight() != other.m_boxData->minHeight()
|| m_boxData->maxHeight() != other.m_boxData->maxHeight())
return true;
if (m_boxData->verticalAlign() != other.m_boxData->verticalAlign())
return true;
if (m_boxData->boxSizing() != other.m_boxData->boxSizing())
return true;
}
if (m_surroundData->margin != other.m_surroundData->margin)
return true;
if (m_surroundData->padding != other.m_surroundData->padding)
return true;
// FIXME: We should add an optimized form of layout that just recomputes visual overflow.
if (changeAffectsVisualOverflow(other))
return true;
if (m_rareNonInheritedData.ptr() != other.m_rareNonInheritedData.ptr()
&& rareNonInheritedDataChangeRequiresLayout(*m_rareNonInheritedData, *other.m_rareNonInheritedData, changedContextSensitiveProperties))
return true;
if (m_rareInheritedData.ptr() != other.m_rareInheritedData.ptr()
&& rareInheritedDataChangeRequiresLayout(*m_rareInheritedData, *other.m_rareInheritedData))
return true;
if (m_inheritedData.ptr() != other.m_inheritedData.ptr()) {
if (m_inheritedData->lineHeight != other.m_inheritedData->lineHeight
#if ENABLE(TEXT_AUTOSIZING)
|| m_inheritedData->specifiedLineHeight != other.m_inheritedData->specifiedLineHeight
#endif
|| m_inheritedData->fontCascade != other.m_inheritedData->fontCascade
|| m_inheritedData->horizontalBorderSpacing != other.m_inheritedData->horizontalBorderSpacing
|| m_inheritedData->verticalBorderSpacing != other.m_inheritedData->verticalBorderSpacing)
return true;
}
if (m_inheritedFlags.boxDirection != other.m_inheritedFlags.boxDirection
|| m_inheritedFlags.rtlOrdering != other.m_inheritedFlags.rtlOrdering
|| m_nonInheritedFlags.position != other.m_nonInheritedFlags.position
|| m_nonInheritedFlags.floating != other.m_nonInheritedFlags.floating
|| m_nonInheritedFlags.originalDisplay != other.m_nonInheritedFlags.originalDisplay
|| m_nonInheritedFlags.verticalAlign != other.m_nonInheritedFlags.verticalAlign)
return true;
if (static_cast<DisplayType>(m_nonInheritedFlags.effectiveDisplay) >= DisplayType::Table) {
if (m_inheritedFlags.borderCollapse != other.m_inheritedFlags.borderCollapse
|| m_inheritedFlags.emptyCells != other.m_inheritedFlags.emptyCells
|| m_inheritedFlags.captionSide != other.m_inheritedFlags.captionSide
|| m_nonInheritedFlags.tableLayout != other.m_nonInheritedFlags.tableLayout)
return true;
// In the collapsing border model, 'hidden' suppresses other borders, while 'none'
// does not, so these style differences can be width differences.
if (m_inheritedFlags.borderCollapse
&& ((borderTopStyle() == BorderStyle::Hidden && other.borderTopStyle() == BorderStyle::None)
|| (borderTopStyle() == BorderStyle::None && other.borderTopStyle() == BorderStyle::Hidden)
|| (borderBottomStyle() == BorderStyle::Hidden && other.borderBottomStyle() == BorderStyle::None)
|| (borderBottomStyle() == BorderStyle::None && other.borderBottomStyle() == BorderStyle::Hidden)
|| (borderLeftStyle() == BorderStyle::Hidden && other.borderLeftStyle() == BorderStyle::None)
|| (borderLeftStyle() == BorderStyle::None && other.borderLeftStyle() == BorderStyle::Hidden)
|| (borderRightStyle() == BorderStyle::Hidden && other.borderRightStyle() == BorderStyle::None)
|| (borderRightStyle() == BorderStyle::None && other.borderRightStyle() == BorderStyle::Hidden)))
return true;
}
if (static_cast<DisplayType>(m_nonInheritedFlags.effectiveDisplay) == DisplayType::ListItem) {
if (m_inheritedFlags.listStyleType != other.m_inheritedFlags.listStyleType
|| m_inheritedFlags.listStylePosition != other.m_inheritedFlags.listStylePosition)
return true;
}
if (m_inheritedFlags.textAlign != other.m_inheritedFlags.textAlign
|| m_inheritedFlags.textTransform != other.m_inheritedFlags.textTransform
|| m_inheritedFlags.direction != other.m_inheritedFlags.direction
|| m_inheritedFlags.whiteSpace != other.m_inheritedFlags.whiteSpace
|| m_nonInheritedFlags.clear != other.m_nonInheritedFlags.clear
|| m_nonInheritedFlags.unicodeBidi != other.m_nonInheritedFlags.unicodeBidi)
return true;
// Check block flow direction.
if (m_inheritedFlags.writingMode != other.m_inheritedFlags.writingMode)
return true;
// Overflow returns a layout hint.
if (m_nonInheritedFlags.overflowX != other.m_nonInheritedFlags.overflowX
|| m_nonInheritedFlags.overflowY != other.m_nonInheritedFlags.overflowY)
return true;
// 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 true;
// If the counter directives change, trigger a relayout to re-calculate counter values and rebuild the counter node tree.
if (!arePointingToEqualData(m_rareNonInheritedData->counterDirectives, other.m_rareNonInheritedData->counterDirectives))
return true;
if ((visibility() == Visibility::Collapse) != (other.visibility() == Visibility::Collapse))
return true;
if (position() != PositionType::Static) {
if (m_surroundData->offset != other.m_surroundData->offset) {
// 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).
if (position() != PositionType::Absolute)
return true;
// Optimize for the case where a positioned layer is moving but not changing size.
if (!positionChangeIsMovementOnly(m_surroundData->offset, other.m_surroundData->offset, m_boxData->width()))
return true;
}
}
bool hasFirstLineStyle = hasPseudoStyle(PseudoId::FirstLine);
if (hasFirstLineStyle != other.hasPseudoStyle(PseudoId::FirstLine))
return true;
if (hasFirstLineStyle) {
auto* firstLineStyle = getCachedPseudoStyle(PseudoId::FirstLine);
if (!firstLineStyle)
return true;
auto* otherFirstLineStyle = other.getCachedPseudoStyle(PseudoId::FirstLine);
if (!otherFirstLineStyle)
return true;
// FIXME: Not all first line style changes actually need layout.
if (*firstLineStyle != *otherFirstLineStyle)
return true;
}
return false;
}
bool RenderStyle::changeRequiresPositionedLayoutOnly(const RenderStyle& other, OptionSet<StyleDifferenceContextSensitiveProperty>&) const
{
if (position() == PositionType::Static)
return false;
if (m_surroundData->offset != other.m_surroundData->offset) {
// Optimize for the case where a positioned layer is moving but not changing size.
if (position() == PositionType::Absolute && positionChangeIsMovementOnly(m_surroundData->offset, other.m_surroundData->offset, m_boxData->width()))
return true;
}
return false;
}
static bool rareNonInheritedDataChangeRequiresLayerRepaint(const StyleRareNonInheritedData& first, const StyleRareNonInheritedData& second, OptionSet<StyleDifferenceContextSensitiveProperty>& changedContextSensitiveProperties)
{
#if ENABLE(CSS_COMPOSITING)
if (first.effectiveBlendMode != second.effectiveBlendMode)
return true;
#endif
if (first.opacity != second.opacity) {
changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::Opacity);
// Don't return true; keep looking for another change.
}
if (first.filter != second.filter) {
changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::Filter);
// Don't return true; keep looking for another change.
}
#if ENABLE(FILTERS_LEVEL_2)
if (first.backdropFilter != second.backdropFilter) {
changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::Filter);
// Don't return true; keep looking for another change.
}
#endif
if (first.mask != second.mask || first.maskBoxImage != second.maskBoxImage)
return true;
return false;
}
bool RenderStyle::changeRequiresLayerRepaint(const RenderStyle& other, OptionSet<StyleDifferenceContextSensitiveProperty>& changedContextSensitiveProperties) const
{
// StyleResolver has ensured that zIndex is non-auto only if it's applicable.
if (m_boxData->zIndex() != other.m_boxData->zIndex() || m_boxData->hasAutoZIndex() != other.m_boxData->hasAutoZIndex())
return true;
if (position() != PositionType::Static) {
if (m_visualData->clip != other.m_visualData->clip || m_visualData->hasClip != other.m_visualData->hasClip) {
changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::ClipRect);
return true;
}
}
if (m_rareNonInheritedData.ptr() != other.m_rareNonInheritedData.ptr()
&& rareNonInheritedDataChangeRequiresLayerRepaint(*m_rareNonInheritedData, *other.m_rareNonInheritedData, changedContextSensitiveProperties))
return true;
return false;
}
static bool requiresPainting(const RenderStyle& style)
{
if (style.visibility() == Visibility::Hidden)
return false;
if (!style.opacity())
return false;
return true;
}
static bool rareNonInheritedDataChangeRequiresRepaint(const StyleRareNonInheritedData& first, const StyleRareNonInheritedData& second, OptionSet<StyleDifferenceContextSensitiveProperty>& changedContextSensitiveProperties)
{
if (first.userDrag != second.userDrag
|| first.borderFit != second.borderFit
|| first.objectFit != second.objectFit
|| first.objectPosition != second.objectPosition)
return true;
if (first.isNotFinal != second.isNotFinal)
return true;
if (first.shapeOutside != second.shapeOutside)
return true;
// FIXME: this should probably be moved to changeRequiresLayerRepaint().
if (first.clipPath != second.clipPath) {
changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::ClipPath);
// Don't return true; keep looking for another change.
}
return false;
}
static bool rareInheritedDataChangeRequiresRepaint(const StyleRareInheritedData& first, const StyleRareInheritedData& second)
{
return first.userModify != second.userModify
|| first.userSelect != second.userSelect
|| first.appleColorFilter != second.appleColorFilter
|| first.imageRendering != second.imageRendering
#if ENABLE(DARK_MODE_CSS)
|| first.supportedColorSchemes != second.supportedColorSchemes
#endif
;
}
bool RenderStyle::changeRequiresRepaint(const RenderStyle& other, OptionSet<StyleDifferenceContextSensitiveProperty>& changedContextSensitiveProperties) const
{
if (!requiresPainting(*this) && !requiresPainting(other))
return false;
if (m_inheritedFlags.visibility != other.m_inheritedFlags.visibility
|| m_inheritedFlags.printColorAdjust != other.m_inheritedFlags.printColorAdjust
|| m_inheritedFlags.insideLink != other.m_inheritedFlags.insideLink
|| m_inheritedFlags.insideDefaultButton != other.m_inheritedFlags.insideDefaultButton
|| m_surroundData->border != other.m_surroundData->border
|| !m_backgroundData->isEquivalentForPainting(*other.m_backgroundData))
return true;
if (m_rareNonInheritedData.ptr() != other.m_rareNonInheritedData.ptr()
&& rareNonInheritedDataChangeRequiresRepaint(*m_rareNonInheritedData, *other.m_rareNonInheritedData, changedContextSensitiveProperties))
return true;
if (m_rareInheritedData.ptr() != other.m_rareInheritedData.ptr()
&& rareInheritedDataChangeRequiresRepaint(*m_rareInheritedData, *other.m_rareInheritedData))
return true;
return false;
}
bool RenderStyle::changeRequiresRepaintIfTextOrBorderOrOutline(const RenderStyle& other, OptionSet<StyleDifferenceContextSensitiveProperty>&) const
{
if (m_inheritedData->color != other.m_inheritedData->color
|| m_inheritedFlags.textDecorations != other.m_inheritedFlags.textDecorations
|| m_visualData->textDecoration != other.m_visualData->textDecoration
|| m_rareNonInheritedData->textDecorationStyle != other.m_rareNonInheritedData->textDecorationStyle
|| m_rareNonInheritedData->textDecorationColor != other.m_rareNonInheritedData->textDecorationColor
|| m_rareInheritedData->textDecorationSkip != other.m_rareInheritedData->textDecorationSkip
|| m_rareInheritedData->textFillColor != other.m_rareInheritedData->textFillColor
|| m_rareInheritedData->textStrokeColor != other.m_rareInheritedData->textStrokeColor
|| m_rareInheritedData->textEmphasisColor != other.m_rareInheritedData->textEmphasisColor
|| m_rareInheritedData->textEmphasisFill != other.m_rareInheritedData->textEmphasisFill