#ifndef FontMetrics_h
#define FontMetrics_h
#include <wtf/MathExtras.h>
namespace WebCore {
const unsigned gDefaultUnitsPerEm = 1000;
class FontMetrics {
public:
FontMetrics()
: m_unitsPerEm(gDefaultUnitsPerEm)
, m_ascent(0)
, m_descent(0)
, m_lineGap(0)
, m_lineSpacing(0)
, m_xHeight(0)
{
}
unsigned unitsPerEm() const { return m_unitsPerEm; }
void setUnitsPerEm(unsigned unitsPerEm) { m_unitsPerEm = unitsPerEm; }
float floatAscent(FontBaseline baselineType = AlphabeticBaseline) const
{
if (baselineType == AlphabeticBaseline)
return m_ascent;
return floatHeight() / 2;
}
void setAscent(float ascent) { m_ascent = ascent; }
float floatDescent(FontBaseline baselineType = AlphabeticBaseline) const
{
if (baselineType == AlphabeticBaseline)
return m_descent;
return floatHeight() / 2;
}
void setDescent(float descent) { m_descent = descent; }
float floatHeight(FontBaseline baselineType = AlphabeticBaseline) const
{
return floatAscent(baselineType) + floatDescent(baselineType);
}
float floatLineGap() const { return m_lineGap; }
void setLineGap(float lineGap) { m_lineGap = lineGap; }
float floatLineSpacing() const { return m_lineSpacing; }
void setLineSpacing(float lineSpacing) { m_lineSpacing = lineSpacing; }
float xHeight() const { return m_xHeight; }
void setXHeight(float xHeight) { m_xHeight = xHeight; }
int ascent(FontBaseline baselineType = AlphabeticBaseline) const
{
if (baselineType == AlphabeticBaseline)
return lroundf(m_ascent);
return height() - height() / 2;
}
int descent(FontBaseline baselineType = AlphabeticBaseline) const
{
if (baselineType == AlphabeticBaseline)
return lroundf(m_descent);
return height() / 2;
}
int height(FontBaseline baselineType = AlphabeticBaseline) const
{
return ascent(baselineType) + descent(baselineType);
}
int lineGap() const { return lroundf(m_lineGap); }
int lineSpacing() const { return lroundf(m_lineSpacing); }
bool hasIdenticalAscentDescentAndLineGap(const FontMetrics& other) const
{
return ascent() == other.ascent() && descent() == other.descent() && lineGap() == other.lineGap();
}
private:
friend class SimpleFontData;
void reset()
{
m_unitsPerEm = gDefaultUnitsPerEm;
m_ascent = 0;
m_descent = 0;
m_lineGap = 0;
m_lineSpacing = 0;
m_xHeight = 0;
}
unsigned m_unitsPerEm;
float m_ascent;
float m_descent;
float m_lineGap;
float m_lineSpacing;
float m_xHeight;
};
}
#endif // FontMetrics_h