#ifndef WidthIterator_h
#define WidthIterator_h
#include <unicode/umachine.h>
#include <wtf/HashSet.h>
#include <wtf/Vector.h>
namespace WebCore {
class FontCascade;
class GlyphBuffer;
class Font;
class TextRun;
struct GlyphData;
struct OriginalAdvancesForCharacterTreatedAsSpace;
typedef Vector<std::pair<int, OriginalAdvancesForCharacterTreatedAsSpace>, 64> CharactersTreatedAsSpace;
struct WidthIterator {
WTF_MAKE_FAST_ALLOCATED;
public:
WidthIterator(const FontCascade*, const TextRun&, HashSet<const Font*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false);
unsigned advance(unsigned to, GlyphBuffer*);
bool advanceOneCharacter(float& width, 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; }
const FontCascade* m_font;
const TextRun& m_run;
unsigned m_currentCharacter;
float m_runWidthSoFar;
float m_expansion;
float m_expansionPerOpportunity;
bool m_isAfterExpansion;
float m_finalRoundingWidth;
private:
GlyphData glyphDataForCharacter(UChar32, bool mirror);
template <typename TextIterator>
inline unsigned advanceInternal(TextIterator&, GlyphBuffer*);
enum class TransformsType { None, Forced, NotForced };
TransformsType shouldApplyFontTransforms(const GlyphBuffer*, unsigned lastGlyphCount, UChar32 previousCharacter) const;
float applyFontTransforms(GlyphBuffer*, bool ltr, unsigned& lastGlyphCount, const Font*, UChar32 previousCharacter, bool force, CharactersTreatedAsSpace&);
HashSet<const Font*>* m_fallbackFonts { nullptr };
bool m_accountForGlyphBounds { false };
bool m_enableKerning { false };
bool m_requiresShaping { false };
bool m_forTextEmphasis { false };
float m_maxGlyphBoundingBoxY { std::numeric_limits<float>::min() };
float m_minGlyphBoundingBoxY { std::numeric_limits<float>::max() };
float m_firstGlyphOverflow { 0 };
float m_lastGlyphOverflow { 0 };
};
}
#endif