void
hb_buffer_t::guess_segment_properties (void)
{
assert (content_type == HB_BUFFER_CONTENT_TYPE_UNICODE ||
(!len && content_type == HB_BUFFER_CONTENT_TYPE_INVALID));
/* If script is set to INVALID, guess from buffer contents */
if (props.script == HB_SCRIPT_INVALID) {
for (unsigned int i = 0; i < len; i++) {
hb_script_t script = unicode->script (info[i].codepoint);
if (likely (script != HB_SCRIPT_COMMON &&
script != HB_SCRIPT_INHERITED &&
script != HB_SCRIPT_UNKNOWN)) {
props.script = script;
break;
}
}
}
/* If direction is set to INVALID, guess from script */
if (props.direction == HB_DIRECTION_INVALID) {
props.direction = hb_script_get_horizontal_direction (props.script);
}
/* If language is not set, use default language from locale */
if (props.language == HB_LANGUAGE_INVALID) {
/* TODO get_default_for_script? using $LANGUAGE */
props.language = hb_language_get_default ();
}
}
int
getDefaultDirection(XeTeXLayoutEngine engine)
{
hb_script_t script = hb_buffer_get_script(engine->hbBuffer);
if (hb_script_get_horizontal_direction (script) == HB_DIRECTION_RTL)
return UBIDI_DEFAULT_RTL;
else
return UBIDI_DEFAULT_LTR;
}
TextGroup::TextGroup(const std::string &input, hb_script_t script, const std::string &lang, hb_direction_t overallDirection)
:script_(script)
,lang_(lang)
,overallDirection_(overallDirection)
{
if(hb_script_get_horizontal_direction(script_) == HB_DIRECTION_LTR)
{
addRun(input, HB_DIRECTION_LTR);
}
else
{
auto text = UnicodeString::fromUTF8(input);
auto length = text.length();
printf("Hominlinx-->TextGroup::TextGroup str unicodelen[%d] ====text[0x%x]\n",length, text.charAt(0) );
UErrorCode err = U_ZERO_ERROR;
UBiDi *bidi = ubidi_openSized(length, 0, &err);//Bidrectional text
ubidi_setPara(bidi, text.getBuffer(), length, hbDirectionToUBIDILevel(overallDirection_), 0, &err);
auto direction = ubidi_getDirection(bidi);
if(direction != UBIDI_MIXED)
{
addRun(input, uciDirectionToHB(direction));
}
else
{
auto count = ubidi_countRuns(bidi, &err);
for(int i=0; i < count; ++i)
{
int32_t start, length;
direction = ubidi_getVisualRun(bidi, i, &start, &length);
addRun(text, direction, start, start + length);
}
}
ubidi_close(bidi);
}
}
