/**
The default function to map a character to the character drawn, or to 0xFFFF if the character is not to be drawn.
*/
EXPORT_C TUint MTmCustom::Map(TUint aChar) const
{
// Deal with some easy cases without calling TChar::GetCategory.
if (aChar >= 0x0020 && aChar <= 0x007E) // ascii
return aChar;
if (aChar >= 0x00A1 && aChar <= 0x021F) // latin supplement & contiguous latin extended
{
if (aChar == CEditableText::EPotentialHyphen) //0x00AD
return '-'; //0x002D
return aChar;
}
if (aChar >= 0xE000 && aChar <= 0xF8FF) // private use area
return aChar;
// All special hyphens are represented as an ordinary hyphen.
if (aChar == CEditableText::ENonBreakingHyphen)
return '-';
// Picture characters are turned into 0x25A3 (black square inside white square).
if (aChar == CEditableText::EPictureCharacter)
return 0x25A3;
// Zero-width space not drawn
if (aChar == 0x200B)
return 0xFFFF;
// Hard space rendered as normal space
if (aChar == 0xA0)
return 0x20;
// don't show corrupt surrogate
if (IsSurrogate(aChar))
{
//This is an informationl message. Commented out to avoid annoyance
//RDebug::Print(_L("Error: Do not show corrupt surrogate %X."), aChar);
return 0xFFFF;
}
TChar::TCategory cat = TChar(aChar).GetCategory();
// Control characters and unassigned characters are usually not understood
// by CFont::DrawText. Some are and must be present to get the correct
// result.
if (cat > TChar::EZsCategory
&& aChar != KZeroWidthJoiner
&& aChar != KZeroWidthNonJoiner)
return 0xFFFF;
// Other characters are left alone.
return aChar;
}
void ExtractNextCodePoint()
{
next_it = it;
if (end - next_it <= 0)
{
next_code_point = ::unicode_iterator::CP_END_OF_STREAM;
return;
}
char16_t high = FromEndianness(endianness, *(next_it++));
if (!IsSurrogate(high))
{
next_code_point = high;
return;
}
if (!IsLead(high))
{
next_code_point = ::unicode_iterator::CP_CORRUPT;
return;
}
if (end - next_it <= 0)
{
next_code_point = ::unicode_iterator::CP_END_OF_STREAM;
return;
}
char16_t low = FromEndianness(endianness, *(next_it++));
if (!IsTrail(low))
{
next_code_point = ::unicode_iterator::CP_CORRUPT;
return;
}
next_code_point = (char32_t(high - 0xd800) << 10) + (low - 0xdc00);
}
