#ifndef GlyphMetricsMap_h
#define GlyphMetricsMap_h
#include "Glyph.h"
#include <array>
#include <wtf/HashMap.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
const float cGlyphSizeUnknown = -1;
template<class T> class GlyphMetricsMap {
WTF_MAKE_NONCOPYABLE(GlyphMetricsMap); WTF_MAKE_FAST_ALLOCATED;
public:
GlyphMetricsMap() : m_filledPrimaryPage(false) { }
T metricsForGlyph(Glyph glyph)
{
return locatePage(glyph / GlyphMetricsPage::size)->metricsForGlyph(glyph);
}
void setMetricsForGlyph(Glyph glyph, const T& metrics)
{
locatePage(glyph / GlyphMetricsPage::size)->setMetricsForGlyph(glyph, metrics);
}
private:
class GlyphMetricsPage {
WTF_MAKE_FAST_ALLOCATED;
public:
static const size_t size = 256; std::array<T, size> m_metrics;
T metricsForGlyph(Glyph glyph) const { return m_metrics[glyph % size]; }
void setMetricsForGlyph(Glyph glyph, const T& metrics)
{
setMetricsForIndex(glyph % size, metrics);
}
void setMetricsForIndex(unsigned index, const T& metrics)
{
m_metrics[index] = metrics;
}
};
GlyphMetricsPage* locatePage(unsigned pageNumber)
{
if (!pageNumber && m_filledPrimaryPage)
return &m_primaryPage;
return locatePageSlowCase(pageNumber);
}
GlyphMetricsPage* locatePageSlowCase(unsigned pageNumber);
static T unknownMetrics();
bool m_filledPrimaryPage;
GlyphMetricsPage m_primaryPage; OwnPtr<HashMap<int, OwnPtr<GlyphMetricsPage>>> m_pages;
};
template<> inline float GlyphMetricsMap<float>::unknownMetrics()
{
return cGlyphSizeUnknown;
}
template<> inline FloatRect GlyphMetricsMap<FloatRect>::unknownMetrics()
{
return FloatRect(0, 0, cGlyphSizeUnknown, cGlyphSizeUnknown);
}
template<class T> typename GlyphMetricsMap<T>::GlyphMetricsPage* GlyphMetricsMap<T>::locatePageSlowCase(unsigned pageNumber)
{
GlyphMetricsPage* page;
if (!pageNumber) {
ASSERT(!m_filledPrimaryPage);
page = &m_primaryPage;
m_filledPrimaryPage = true;
} else {
if (m_pages) {
if ((page = m_pages->get(pageNumber)))
return page;
} else
m_pages = adoptPtr(new HashMap<int, OwnPtr<GlyphMetricsPage>>);
page = new GlyphMetricsPage;
m_pages->set(pageNumber, adoptPtr(page));
}
for (unsigned i = 0; i < GlyphMetricsPage::size; i++)
page->setMetricsForIndex(i, unknownMetrics());
return page;
}
}
#endif