/**
* When the direction option is <code>UBIDI_DEFAULT_LTR</code> or
* <code>UBIDI_DEFAULT_RTL</code>, resolve the base direction according to that
* of the first strong bidi character.
*/
static void
resolveBaseDirection(const UChar *text, uint32_t length,
UBiDiLevel *pInLevel, UBiDiLevel *pOutLevel)
{
switch (*pInLevel) {
case UBIDI_DEFAULT_LTR:
case UBIDI_DEFAULT_RTL: {
UBiDiLevel level = ubidi_getBaseDirection(text, length);
*pInLevel = level != UBIDI_NEUTRAL ? level
: *pInLevel == UBIDI_DEFAULT_RTL ? RTL : LTR;
break;
}
default:
*pInLevel &= 1;
break;
}
switch (*pOutLevel) {
case UBIDI_DEFAULT_LTR:
case UBIDI_DEFAULT_RTL:
*pOutLevel = *pInLevel;
break;
default:
*pOutLevel &= 1;
break;
}
}
void font_face_set::get_string_info(string_info & info, UnicodeString const& ustr, char_properties *format)
{
double avg_height = character_dimensions('X').height();
UErrorCode err = U_ZERO_ERROR;
UnicodeString reordered;
UnicodeString shaped;
int32_t length = ustr.length();
UBiDi *bidi = ubidi_openSized(length, 0, &err);
ubidi_setPara(bidi, ustr.getBuffer(), length, UBIDI_DEFAULT_LTR, 0, &err);
ubidi_writeReordered(bidi, reordered.getBuffer(length),
length, UBIDI_DO_MIRRORING, &err);
reordered.releaseBuffer(length);
u_shapeArabic(reordered.getBuffer(), length,
shaped.getBuffer(length), length,
U_SHAPE_LETTERS_SHAPE | U_SHAPE_LENGTH_FIXED_SPACES_NEAR |
U_SHAPE_TEXT_DIRECTION_VISUAL_LTR, &err);
shaped.releaseBuffer(length);
if (U_SUCCESS(err)) {
StringCharacterIterator iter(shaped);
for (iter.setToStart(); iter.hasNext();) {
UChar ch = iter.nextPostInc();
char_info char_dim = character_dimensions(ch);
char_dim.format = format;
char_dim.avg_height = avg_height;
info.add_info(char_dim);
}
}
#if (U_ICU_VERSION_MAJOR_NUM*100 + U_ICU_VERSION_MINOR_NUM >= 406)
if (ubidi_getBaseDirection(ustr.getBuffer(), length) == UBIDI_RTL)
{
info.set_rtl(true);
}
#endif
ubidi_close(bidi);
}
