bool Font::canUseGlyphCache(const TextRun& run) const
{
// Start from 0 since drawing and highlighting also measure the characters before run->from
for (int i = 0; i < run.to(); i++)
{
const UChar c = run[i];
if (c < 0x300) // U+0300 through U+036F Combining diacritical marks
continue;
if (c <= 0x36F)
return false;
if (c < 0x0591 || c == 0x05BE) // U+0591 through U+05CF excluding U+05BE Hebrew combining marks, Hebrew punctuation Paseq, Sof Pasuq and Nun Hafukha
continue;
if (c <= 0x05CF)
return false;
if (c < 0x0600) // U+0600 through U+1059 Arabic, Syriac, Thaana, Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada, Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar
continue;
if (c <= 0x1059)
return false;
if (c < 0x1100) // U+1100 through U+11FF Hangul Jamo (only Ancient Korean should be left here if you precompose; Modern Korean will be precomposed as a result of step A)
continue;
if (c <= 0x11FF)
return false;
if (c < 0x1780) // U+1780 through U+18AF Khmer, Mongolian
continue;
if (c <= 0x18AF)
return false;
if (c < 0x1900) // U+1900 through U+194F Limbu (Unicode 4.0)
continue;
if (c <= 0x194F)
return false;
if (c < 0x20D0) // U+20D0 through U+20FF Combining marks for symbols
continue;
if (c <= 0x20FF)
return false;
if (c < 0xFE20) // U+FE20 through U+FE2F Combining half marks
continue;
if (c <= 0xFE2F)
return false;
}
return true;
}
int Font::offsetForPositionForSimpleText(const TextRun& run, const TextStyle& style, int x, bool includePartialGlyphs) const
{
return run.to() - run.from();
}
