Source/WebCore/rendering/RenderText.h - WebKit - Git at Google

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2021 Apple Inc. 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.
  *
  */

 #pragma once

 #include "RenderElement.h"
 #include "RenderTextLineBoxes.h"
 #include "Text.h"
 #include <wtf/Forward.h>
 #include <wtf/text/TextBreakIterator.h>

 namespace WebCore {

 class Font;
 class LegacyInlineTextBox;
 struct GlyphOverflow;
 struct WordTrailingSpace;

 namespace LayoutIntegration {
 class LineLayout;
 }

 class RenderText : public RenderObject {
     WTF_MAKE_ISO_ALLOCATED(RenderText);
 public:
     RenderText(Text&, const String&);
     RenderText(Document&, const String&);

     virtual ~RenderText();

     WEBCORE_EXPORT Text* textNode() const;

     virtual bool isTextFragment() const;

     const RenderStyle& style() const;
     const RenderStyle& firstLineStyle() const;
     const RenderStyle* getCachedPseudoStyle(PseudoId, const RenderStyle* parentStyle = nullptr) const;

     Color selectionBackgroundColor() const;
     Color selectionForegroundColor() const;
     Color selectionEmphasisMarkColor() const;
     std::unique_ptr<RenderStyle> selectionPseudoStyle() const;

     virtual String originalText() const;

     void extractTextBox(LegacyInlineTextBox& box) { m_lineBoxes.extract(box); }
     void attachTextBox(LegacyInlineTextBox& box) { m_lineBoxes.attach(box); }
     void removeTextBox(LegacyInlineTextBox& box) { m_lineBoxes.remove(box); }

     StringImpl& text() const { return *m_text.impl(); } // Since m_text can never be null, returning this type means callers won't null check.
     String textWithoutConvertingBackslashToYenSymbol() const;

     LegacyInlineTextBox* createInlineTextBox() { return m_lineBoxes.createAndAppendLineBox(*this); }
     void dirtyLineBoxes(bool fullLayout);
     void deleteLineBoxes();

     void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const final;
     Vector<IntRect> absoluteRectsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = nullptr) const;
 #if PLATFORM(IOS_FAMILY)
     void collectSelectionGeometries(Vector<SelectionGeometry>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max()) final;
 #endif

     void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const final;
     Vector<FloatQuad> absoluteQuadsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool ignoreEmptyTextSelections = false, bool* wasFixed = nullptr) const;

     Vector<FloatQuad> absoluteQuadsClippedToEllipsis() const;

     Position positionForPoint(const LayoutPoint&) final;

     UChar characterAt(unsigned) const;
     unsigned length() const final { return text().length(); }

     void positionLineBox(LegacyInlineTextBox&);

     virtual float width(unsigned from, unsigned length, const FontCascade&, float xPos, HashSet<const Font*>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;
     virtual float width(unsigned from, unsigned length, float xPos, bool firstLine = false, HashSet<const Font*>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;

     float minLogicalWidth() const;
     float maxLogicalWidth() const;

     struct Widths {
         float min { 0 };
         float max { 0 };
         float beginMin { 0 };
         float endMin { 0 };
         float beginMax { 0 };
         float endMax { 0 };
         bool beginWS { false };
         bool endWS { false };
         bool hasBreakableChar { false };
         bool hasBreak { false };
         bool endsWithBreak { false };
     };
     Widths trimmedPreferredWidths(float leadWidth, bool& stripFrontSpaces);

     float hangablePunctuationStartWidth(unsigned index) const;
     float hangablePunctuationEndWidth(unsigned index) const;
     unsigned firstCharacterIndexStrippingSpaces() const;
     unsigned lastCharacterIndexStrippingSpaces() const;
     static bool isHangableStopOrComma(UChar);

     WEBCORE_EXPORT virtual IntRect linesBoundingBox() const;
     WEBCORE_EXPORT IntPoint firstRunLocation() const;

     virtual void setText(const String&, bool force = false);
     void setTextWithOffset(const String&, unsigned offset, unsigned len, bool force = false);

     bool canBeSelectionLeaf() const override { return true; }

     LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>&);

     LayoutUnit marginLeft() const { return minimumValueForLength(style().marginLeft(), 0); }
     LayoutUnit marginRight() const { return minimumValueForLength(style().marginRight(), 0); }

     LegacyInlineTextBox* firstTextBox() const { return m_lineBoxes.first(); }
     LegacyInlineTextBox* lastTextBox() const { return m_lineBoxes.last(); }

     int caretMinOffset() const final;
     int caretMaxOffset() const final;
     unsigned countRenderedCharacterOffsetsUntil(unsigned) const;
     bool containsRenderedCharacterOffset(unsigned) const;
     bool containsCaretOffset(unsigned) const;
     bool hasRenderedText() const;

     // FIXME: These should return unsigneds.
     int previousOffset(int current) const final;
     int previousOffsetForBackwardDeletion(int current) const final;
     int nextOffset(int current) const final;

     bool needsVisualReordering() const { return m_needsVisualReordering; }
     void setNeedsVisualReordering() { m_needsVisualReordering = true; }

     void momentarilyRevealLastTypedCharacter(unsigned offsetAfterLastTypedCharacter);

     LegacyInlineTextBox* findNextInlineTextBox(int offset, int& pos) const { return m_lineBoxes.findNext(offset, pos); }

     bool isAllCollapsibleWhitespace() const;

     bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; }

     void removeAndDestroyTextBoxes();

     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);

     virtual std::unique_ptr<LegacyInlineTextBox> createTextBox();

 #if ENABLE(TEXT_AUTOSIZING)
     float candidateComputedTextSize() const { return m_candidateComputedTextSize; }
     void setCandidateComputedTextSize(float size) { m_candidateComputedTextSize = size; }
 #endif

     bool usesLegacyLineLayoutPath() const;

     StringView stringView(unsigned start = 0, std::optional<unsigned> stop = std::nullopt) const;

     bool containsOnlyHTMLWhitespace(unsigned from, unsigned length) const;

     bool canUseSimplifiedTextMeasuring() const { return m_canUseSimplifiedTextMeasuring; }

     Vector<std::pair<unsigned, unsigned>> draggedContentRangesBetweenOffsets(unsigned startOffset, unsigned endOffset) const;

     RenderInline* inlineWrapperForDisplayContents();
     void setInlineWrapperForDisplayContents(RenderInline*);

     static RenderText* findByDisplayContentsInlineWrapperCandidate(RenderElement&);

     template <typename MeasureTextCallback>
     static float measureTextConsideringPossibleTrailingSpace(bool currentCharacterIsSpace, unsigned startIndex, unsigned wordLength, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, MeasureTextCallback&&);

 protected:
     virtual void computePreferredLogicalWidths(float leadWidth);
     void willBeDestroyed() override;

     virtual void setRenderedText(const String&);
     virtual UChar previousCharacter() const;

     RenderTextLineBoxes m_lineBoxes;

 private:
     RenderText(Node&, const String&);

     const char* renderName() const override;

     bool canHaveChildren() const final { return false; }

     VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*) override;

     void setSelectionState(HighlightState) final;
     LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) final;
     LayoutRect clippedOverflowRect(const RenderLayerModelObject* repaintContainer, VisibleRectContext) const final;

     void computePreferredLogicalWidths(float leadWidth, HashSet<const Font*>& fallbackFonts, GlyphOverflow&);

     bool computeCanUseSimpleFontCodePath() const;

     bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) final { ASSERT_NOT_REACHED(); return false; }

     float widthFromCache(const FontCascade&, unsigned start, unsigned len, float xPos, HashSet<const Font*>* fallbackFonts, GlyphOverflow*, const RenderStyle&) const;
     bool computeUseBackslashAsYenSymbol() const;

     void secureText(UChar mask);

     LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>*);
     bool computeCanUseSimplifiedTextMeasuring() const;

     void node() const = delete;
     void container() const = delete; // Use parent() instead.
     void container(const RenderLayerModelObject&, bool&) const = delete; // Use parent() instead.

     float maxWordFragmentWidth(const RenderStyle&, const FontCascade&, StringView word, unsigned minimumPrefixLength, unsigned minimumSuffixLength, bool currentCharacterIsSpace, unsigned characterIndex, float xPos, float entireWordWidth, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, GlyphOverflow&);
     float widthFromCacheConsideringPossibleTrailingSpace(const RenderStyle&, const FontCascade&, unsigned startIndex, unsigned wordLen, float xPos, bool currentCharacterIsSpace, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, GlyphOverflow&) const;

     // We put the bitfield first to minimize padding on 64-bit.
     unsigned m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines.
     unsigned m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n').
     unsigned m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t').
     unsigned m_hasBeginWS : 1; // Whether or not we begin with WS (only true if we aren't pre)
     unsigned m_hasEndWS : 1; // Whether or not we end with WS (only true if we aren't pre)
     unsigned m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific
                            // line boxes, and this hint will enable layoutInlineChildren to avoid
                            // just dirtying everything when character data is modified (e.g., appended/inserted
                            // or removed).
     unsigned m_needsVisualReordering : 1;
     unsigned m_isAllASCII : 1;
     unsigned m_canUseSimpleFontCodePath : 1;
     mutable unsigned m_knownToHaveNoOverflowAndNoFallbackFonts : 1;
     unsigned m_useBackslashAsYenSymbol : 1;
     unsigned m_originalTextDiffersFromRendered : 1;
     unsigned m_hasInlineWrapperForDisplayContents : 1;
     unsigned m_canUseSimplifiedTextMeasuring : 1;

 #if ENABLE(TEXT_AUTOSIZING)
     // FIXME: This should probably be part of the text sizing structures in Document instead. That would save some memory.
     float m_candidateComputedTextSize { 0 };
 #endif
     float m_minWidth { -1 };
     float m_maxWidth { -1 };
     float m_beginMinWidth { 0 };
     float m_endMinWidth { 0 };

     String m_text;
 };

 String applyTextTransform(const RenderStyle&, const String&, UChar previousCharacter);
 String capitalize(const String&, UChar previousCharacter);
 LineBreakIteratorMode mapLineBreakToIteratorMode(LineBreak);

 inline UChar RenderText::characterAt(unsigned i) const
 {
     return i >= length() ? 0 : text()[i];
 }

 inline const RenderStyle& RenderText::style() const
 {
     return parent()->style();
 }

 inline const RenderStyle& RenderText::firstLineStyle() const
 {
     return parent()->firstLineStyle();
 }

 inline const RenderStyle* RenderText::getCachedPseudoStyle(PseudoId pseudoId, const RenderStyle* parentStyle) const
 {
     // Pseudostyle is associated with an element, so ascend the tree until we find a non-anonymous ancestor.
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->getCachedPseudoStyle(pseudoId, parentStyle);
     return nullptr;
 }

 inline Color RenderText::selectionBackgroundColor() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->selectionBackgroundColor();
     return Color();
 }

 inline Color RenderText::selectionForegroundColor() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->selectionForegroundColor();
     return Color();
 }

 inline Color RenderText::selectionEmphasisMarkColor() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->selectionEmphasisMarkColor();
     return Color();
 }

 inline std::unique_ptr<RenderStyle> RenderText::selectionPseudoStyle() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->selectionPseudoStyle();
     return nullptr;
 }

 inline RenderText* Text::renderer() const
 {
     return downcast<RenderText>(Node::renderer());
 }

 } // namespace WebCore

 SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderText, isText())
	/*
	* (C) 1999 Lars Knoll (knoll@kde.org)
	* (C) 2000 Dirk Mueller (mueller@kde.org)
	* Copyright (C) 2004-2021 Apple Inc. 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.
	*
	*/

	#pragma once

	#include "RenderElement.h"
	#include "RenderTextLineBoxes.h"
	#include "Text.h"
	#include <wtf/Forward.h>
	#include <wtf/text/TextBreakIterator.h>

	namespace WebCore {

	class Font;
	class LegacyInlineTextBox;
	struct GlyphOverflow;
	struct WordTrailingSpace;

	namespace LayoutIntegration {
	class LineLayout;
	}

	class RenderText : public RenderObject {
	WTF_MAKE_ISO_ALLOCATED(RenderText);
	public:
	RenderText(Text&, const String&);
	RenderText(Document&, const String&);

	virtual ~RenderText();

	WEBCORE_EXPORT Text* textNode() const;

	virtual bool isTextFragment() const;

	const RenderStyle& style() const;
	const RenderStyle& firstLineStyle() const;
	const RenderStyle* getCachedPseudoStyle(PseudoId, const RenderStyle* parentStyle = nullptr) const;

	Color selectionBackgroundColor() const;
	Color selectionForegroundColor() const;
	Color selectionEmphasisMarkColor() const;
	std::unique_ptr<RenderStyle> selectionPseudoStyle() const;

	virtual String originalText() const;

	void extractTextBox(LegacyInlineTextBox& box) { m_lineBoxes.extract(box); }
	void attachTextBox(LegacyInlineTextBox& box) { m_lineBoxes.attach(box); }
	void removeTextBox(LegacyInlineTextBox& box) { m_lineBoxes.remove(box); }

	StringImpl& text() const { return *m_text.impl(); } // Since m_text can never be null, returning this type means callers won't null check.
	String textWithoutConvertingBackslashToYenSymbol() const;

	LegacyInlineTextBox* createInlineTextBox() { return m_lineBoxes.createAndAppendLineBox(*this); }
	void dirtyLineBoxes(bool fullLayout);
	void deleteLineBoxes();

	void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const final;
	Vector<IntRect> absoluteRectsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = nullptr) const;
	#if PLATFORM(IOS_FAMILY)
	void collectSelectionGeometries(Vector<SelectionGeometry>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max()) final;
	#endif

	void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const final;
	Vector<FloatQuad> absoluteQuadsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool ignoreEmptyTextSelections = false, bool* wasFixed = nullptr) const;

	Vector<FloatQuad> absoluteQuadsClippedToEllipsis() const;

	Position positionForPoint(const LayoutPoint&) final;

	UChar characterAt(unsigned) const;
	unsigned length() const final { return text().length(); }

	void positionLineBox(LegacyInlineTextBox&);

	virtual float width(unsigned from, unsigned length, const FontCascade&, float xPos, HashSet<const Font> fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;
	virtual float width(unsigned from, unsigned length, float xPos, bool firstLine = false, HashSet<const Font> fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;

	float minLogicalWidth() const;
	float maxLogicalWidth() const;

	struct Widths {
	float min { 0 };
	float max { 0 };
	float beginMin { 0 };
	float endMin { 0 };
	float beginMax { 0 };
	float endMax { 0 };
	bool beginWS { false };
	bool endWS { false };
	bool hasBreakableChar { false };
	bool hasBreak { false };
	bool endsWithBreak { false };
	};
	Widths trimmedPreferredWidths(float leadWidth, bool& stripFrontSpaces);

	float hangablePunctuationStartWidth(unsigned index) const;
	float hangablePunctuationEndWidth(unsigned index) const;
	unsigned firstCharacterIndexStrippingSpaces() const;
	unsigned lastCharacterIndexStrippingSpaces() const;
	static bool isHangableStopOrComma(UChar);

	WEBCORE_EXPORT virtual IntRect linesBoundingBox() const;
	WEBCORE_EXPORT IntPoint firstRunLocation() const;

	virtual void setText(const String&, bool force = false);
	void setTextWithOffset(const String&, unsigned offset, unsigned len, bool force = false);

	bool canBeSelectionLeaf() const override { return true; }

	LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>&);

	LayoutUnit marginLeft() const { return minimumValueForLength(style().marginLeft(), 0); }
	LayoutUnit marginRight() const { return minimumValueForLength(style().marginRight(), 0); }

	LegacyInlineTextBox* firstTextBox() const { return m_lineBoxes.first(); }
	LegacyInlineTextBox* lastTextBox() const { return m_lineBoxes.last(); }

	int caretMinOffset() const final;
	int caretMaxOffset() const final;
	unsigned countRenderedCharacterOffsetsUntil(unsigned) const;
	bool containsRenderedCharacterOffset(unsigned) const;
	bool containsCaretOffset(unsigned) const;
	bool hasRenderedText() const;

	// FIXME: These should return unsigneds.
	int previousOffset(int current) const final;
	int previousOffsetForBackwardDeletion(int current) const final;
	int nextOffset(int current) const final;

	bool needsVisualReordering() const { return m_needsVisualReordering; }
	void setNeedsVisualReordering() { m_needsVisualReordering = true; }

	void momentarilyRevealLastTypedCharacter(unsigned offsetAfterLastTypedCharacter);

	LegacyInlineTextBox* findNextInlineTextBox(int offset, int& pos) const { return m_lineBoxes.findNext(offset, pos); }

	bool isAllCollapsibleWhitespace() const;

	bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; }

	void removeAndDestroyTextBoxes();

	virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);

	virtual std::unique_ptr<LegacyInlineTextBox> createTextBox();

	#if ENABLE(TEXT_AUTOSIZING)
	float candidateComputedTextSize() const { return m_candidateComputedTextSize; }
	void setCandidateComputedTextSize(float size) { m_candidateComputedTextSize = size; }
	#endif

	bool usesLegacyLineLayoutPath() const;

	StringView stringView(unsigned start = 0, std::optional<unsigned> stop = std::nullopt) const;

	bool containsOnlyHTMLWhitespace(unsigned from, unsigned length) const;

	bool canUseSimplifiedTextMeasuring() const { return m_canUseSimplifiedTextMeasuring; }

	Vector<std::pair<unsigned, unsigned>> draggedContentRangesBetweenOffsets(unsigned startOffset, unsigned endOffset) const;

	RenderInline* inlineWrapperForDisplayContents();
	void setInlineWrapperForDisplayContents(RenderInline*);

	static RenderText* findByDisplayContentsInlineWrapperCandidate(RenderElement&);

	template <typename MeasureTextCallback>
	static float measureTextConsideringPossibleTrailingSpace(bool currentCharacterIsSpace, unsigned startIndex, unsigned wordLength, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, MeasureTextCallback&&);

	protected:
	virtual void computePreferredLogicalWidths(float leadWidth);
	void willBeDestroyed() override;

	virtual void setRenderedText(const String&);
	virtual UChar previousCharacter() const;

	RenderTextLineBoxes m_lineBoxes;

	private:
	RenderText(Node&, const String&);

	const char* renderName() const override;

	bool canHaveChildren() const final { return false; }

	VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*) override;

	void setSelectionState(HighlightState) final;
	LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) final;
	LayoutRect clippedOverflowRect(const RenderLayerModelObject* repaintContainer, VisibleRectContext) const final;

	void computePreferredLogicalWidths(float leadWidth, HashSet<const Font*>& fallbackFonts, GlyphOverflow&);

	bool computeCanUseSimpleFontCodePath() const;

	bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) final { ASSERT_NOT_REACHED(); return false; }

	float widthFromCache(const FontCascade&, unsigned start, unsigned len, float xPos, HashSet<const Font> fallbackFonts, GlyphOverflow*, const RenderStyle&) const;
	bool computeUseBackslashAsYenSymbol() const;

	void secureText(UChar mask);

	LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>*);
	bool computeCanUseSimplifiedTextMeasuring() const;

	void node() const = delete;
	void container() const = delete; // Use parent() instead.
	void container(const RenderLayerModelObject&, bool&) const = delete; // Use parent() instead.

	float maxWordFragmentWidth(const RenderStyle&, const FontCascade&, StringView word, unsigned minimumPrefixLength, unsigned minimumSuffixLength, bool currentCharacterIsSpace, unsigned characterIndex, float xPos, float entireWordWidth, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, GlyphOverflow&);
	float widthFromCacheConsideringPossibleTrailingSpace(const RenderStyle&, const FontCascade&, unsigned startIndex, unsigned wordLen, float xPos, bool currentCharacterIsSpace, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, GlyphOverflow&) const;

	// We put the bitfield first to minimize padding on 64-bit.
	unsigned m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines.
	unsigned m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n').
	unsigned m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t').
	unsigned m_hasBeginWS : 1; // Whether or not we begin with WS (only true if we aren't pre)
	unsigned m_hasEndWS : 1; // Whether or not we end with WS (only true if we aren't pre)
	unsigned m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific
	// line boxes, and this hint will enable layoutInlineChildren to avoid
	// just dirtying everything when character data is modified (e.g., appended/inserted
	// or removed).
	unsigned m_needsVisualReordering : 1;
	unsigned m_isAllASCII : 1;
	unsigned m_canUseSimpleFontCodePath : 1;
	mutable unsigned m_knownToHaveNoOverflowAndNoFallbackFonts : 1;
	unsigned m_useBackslashAsYenSymbol : 1;
	unsigned m_originalTextDiffersFromRendered : 1;
	unsigned m_hasInlineWrapperForDisplayContents : 1;
	unsigned m_canUseSimplifiedTextMeasuring : 1;

	#if ENABLE(TEXT_AUTOSIZING)
	// FIXME: This should probably be part of the text sizing structures in Document instead. That would save some memory.
	float m_candidateComputedTextSize { 0 };
	#endif
	float m_minWidth { -1 };
	float m_maxWidth { -1 };
	float m_beginMinWidth { 0 };
	float m_endMinWidth { 0 };

	String m_text;
	};

	String applyTextTransform(const RenderStyle&, const String&, UChar previousCharacter);
	String capitalize(const String&, UChar previousCharacter);
	LineBreakIteratorMode mapLineBreakToIteratorMode(LineBreak);

	inline UChar RenderText::characterAt(unsigned i) const
	{
	return i >= length() ? 0 : text()[i];
	}

	inline const RenderStyle& RenderText::style() const
	{
	return parent()->style();
	}

	inline const RenderStyle& RenderText::firstLineStyle() const
	{
	return parent()->firstLineStyle();
	}

	inline const RenderStyle* RenderText::getCachedPseudoStyle(PseudoId pseudoId, const RenderStyle* parentStyle) const
	{
	// Pseudostyle is associated with an element, so ascend the tree until we find a non-anonymous ancestor.
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->getCachedPseudoStyle(pseudoId, parentStyle);
	return nullptr;
	}

	inline Color RenderText::selectionBackgroundColor() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->selectionBackgroundColor();
	return Color();
	}

	inline Color RenderText::selectionForegroundColor() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->selectionForegroundColor();
	return Color();
	}

	inline Color RenderText::selectionEmphasisMarkColor() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->selectionEmphasisMarkColor();
	return Color();
	}

	inline std::unique_ptr<RenderStyle> RenderText::selectionPseudoStyle() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->selectionPseudoStyle();
	return nullptr;
	}

	inline RenderText* Text::renderer() const
	{
	return downcast<RenderText>(Node::renderer());
	}

	} // namespace WebCore

	SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderText, isText())