#ifndef WidthIterator_h
#define WidthIterator_h
#include "FontCascade.h"
#include "SVGGlyph.h"
#include "TextRun.h"
#include <wtf/HashSet.h>
#include <wtf/Vector.h>
namespace WebCore {
class FontCascade;
class GlyphBuffer;
class Font;
class TextRun;
struct GlyphData;
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(int 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; }
#if ENABLE(SVG_FONTS)
String lastGlyphName() const { return m_lastGlyphName; }
void setLastGlyphName(const String& name) { m_lastGlyphName = name; }
Vector<SVGGlyph::ArabicForm>& arabicForms() { return m_arabicForms; }
#endif
static bool supportsTypesettingFeatures(const FontCascade& font)
{
#if PLATFORM(COCOA)
return !(font.typesettingFeatures() & ~(Kerning | Ligatures));
#else
return !font.typesettingFeatures();
#endif
}
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;
#if ENABLE(SVG_FONTS)
String m_lastGlyphName;
Vector<SVGGlyph::ArabicForm> m_arabicForms;
#endif
private:
GlyphData glyphDataForCharacter(UChar32, bool mirror, int currentCharacter, unsigned& advanceLength, String& normalizedSpacesStringCache);
template <typename TextIterator>
inline unsigned advanceInternal(TextIterator&, GlyphBuffer*);
enum class TransformsType { None, Forced, NotForced };
TransformsType shouldApplyFontTransforms(const GlyphBuffer*, int lastGlyphCount, UChar32 previousCharacter) const;
TypesettingFeatures m_typesettingFeatures;
HashSet<const Font*>* m_fallbackFonts;
bool m_accountForGlyphBounds;
float m_maxGlyphBoundingBoxY;
float m_minGlyphBoundingBoxY;
float m_firstGlyphOverflow;
float m_lastGlyphOverflow;
bool m_forTextEmphasis;
};
}
#endif