xref: /external/chromium_org/third_party/WebKit/Source/platform/fonts/skia/FontPlatformDataSkia.cpp

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 *
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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#include "config.h"
#include "platform/fonts/FontPlatformData.h"

#include "SkEndian.h"
#include "SkTypeface.h"
#include "platform/fonts/FontCache.h"

namespace blink {

#if !OS(MACOSX)
unsigned FontPlatformData::hash() const
{
    unsigned h = SkTypeface::UniqueID(m_typeface.get());
    h ^= 0x01010101 * ((static_cast<int>(m_isHashTableDeletedValue) << 3) | (static_cast<int>(m_orientation) << 2) | (static_cast<int>(m_syntheticBold) << 1) | static_cast<int>(m_syntheticItalic));

    // This memcpy is to avoid a reinterpret_cast that breaks strict-aliasing
    // rules. Memcpy is generally optimized enough so that performance doesn't
    // matter here.
    uint32_t textSizeBytes;
    memcpy(&textSizeBytes, &m_textSize, sizeof(uint32_t));
    h ^= textSizeBytes;

    return h;
}

bool FontPlatformData::fontContainsCharacter(UChar32 character)
{
    SkPaint paint;
    setupPaint(&paint);
    paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);

    uint16_t glyph;
    paint.textToGlyphs(&character, sizeof(character), &glyph);
    return glyph;
}

#endif

#if ENABLE(OPENTYPE_VERTICAL)
PassRefPtr<OpenTypeVerticalData> FontPlatformData::verticalData() const
{
    return FontCache::fontCache()->getVerticalData(typeface()->uniqueID(), *this);
}

PassRefPtr<SharedBuffer> FontPlatformData::openTypeTable(uint32_t table) const
{
    RefPtr<SharedBuffer> buffer;

    SkFontTableTag tag = SkEndianSwap32(table);
    const size_t tableSize = m_typeface->getTableSize(tag);
    if (tableSize) {
        Vector<char> tableBuffer(tableSize);
        m_typeface->getTableData(tag, 0, tableSize, &tableBuffer[0]);
        buffer = SharedBuffer::adoptVector(tableBuffer);
    }
    return buffer.release();
}
#endif

} // namespace blink