#ifndef WidthIterator_h
#define WidthIterator_h
#include "GlyphBuffer.h"
#include <unicode/umachine.h>
#include <wtf/HashSet.h>
#include <wtf/Vector.h>
namespace WebCore {
class FontCascade;
class Font;
class TextRun;
struct GlyphData;
struct GlyphIndexRange;
struct OriginalAdvancesForCharacterTreatedAsSpace;
using CharactersTreatedAsSpace = Vector<OriginalAdvancesForCharacterTreatedAsSpace, 64>;
struct WidthIterator {
WTF_MAKE_FAST_ALLOCATED;
public:
WidthIterator(const FontCascade&, const TextRun&, HashSet<const Font*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false);
void advance(unsigned to, GlyphBuffer&);
bool advanceOneCharacter(float& width, GlyphBuffer&);
void finalize(GlyphBuffer&);
float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; }
float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; }
float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; }
float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; }
const TextRun& run() const { return m_run; }
float runWidthSoFar() const { return m_runWidthSoFar; }
unsigned currentCharacterIndex() const { return m_currentCharacterIndex; }
private:
GlyphData glyphDataForCharacter(UChar32, bool mirror);
template <typename TextIterator>
inline void advanceInternal(TextIterator&, GlyphBuffer&);
enum class TransformsType { None, Forced, NotForced };
TransformsType shouldApplyFontTransforms(const GlyphBuffer&, unsigned lastGlyphCount, unsigned currentCharacterIndex) const;
float applyFontTransforms(GlyphBuffer&, unsigned lastGlyphCount, unsigned currentCharacterIndex, const Font&, bool force, CharactersTreatedAsSpace&);
void commitCurrentFontRange(GlyphBuffer&, unsigned lastGlyphCount, unsigned currentCharacterIndex, const Font&, const Font& primaryFont, UChar32 character, float widthOfCurrentFontRange, CharactersTreatedAsSpace&);
bool hasExtraSpacing() const;
void applyExtraSpacingAfterShaping(GlyphBuffer&, unsigned characterStartIndex, unsigned glyphBufferStartIndex, unsigned characterDestinationIndex, float startingRunWidth);
struct AdditionalWidth {
float left;
float right;
float leftExpansion;
float rightExpansion;
};
AdditionalWidth calculateAdditionalWidth(GlyphBuffer&, GlyphBufferStringOffset currentCharacterIndex, unsigned leadingGlyphIndex, unsigned trailingGlyphIndex, float position) const;
void applyAdditionalWidth(GlyphBuffer&, GlyphIndexRange, float leftAdditionalWidth, float rightAdditionalWidth, float leftExpansionAdditionalWidth, float rightExpansionAdditionalWidth);
const FontCascade& m_font;
const TextRun& m_run;
HashSet<const Font*>* m_fallbackFonts { nullptr };
Optional<unsigned> m_lastCharacterIndex;
unsigned m_currentCharacterIndex { 0 };
float m_leftoverJustificationWidth { 0 };
float m_runWidthSoFar { 0 };
float m_expansion { 0 };
float m_expansionPerOpportunity { 0 };
float m_maxGlyphBoundingBoxY { std::numeric_limits<float>::min() };
float m_minGlyphBoundingBoxY { std::numeric_limits<float>::max() };
float m_firstGlyphOverflow { 0 };
float m_lastGlyphOverflow { 0 };
bool m_containsTabs { false };
bool m_isAfterExpansion { false };
bool m_accountForGlyphBounds { false };
bool m_enableKerning { false };
bool m_requiresShaping { false };
bool m_forTextEmphasis { false };
};
}
#endif