[FriBidi] FriBidi and emoji modifiers

[Romain Ouabdelkader]

Hi,

I'm having some trouble to get emojis to work with FriBidi.
Basic emoji works fine, but when using emoji modifiers in a RTL language,
the modifiers end up before the emoji.

Here I have a string with an arabic text, the emoji U+1f476 (a baby) and a
tone modifier U+1f3fb:


const char utf8_input[] = u8"اختبار \U0001f476\U0001f3fb";
int utf8_len = sizeof(utf8_input) - 1;

std::unique_ptr<FriBidiChar[]> unicode_str(new FriBidiChar[utf8_len]);

FriBidiCharSet utf8_charset = fribidi_parse_charset("UTF-8");
int len_unicode = fribidi_charset_to_unicode(utf8_charset, utf8_input,
                                             utf8_len, unicode_str.get());

std::unique_ptr<FriBidiCharType[]> bidi_types(new
FriBidiCharType[len_unicode]);
std::unique_ptr<FriBidiLevel[]> levels(new FriBidiLevel[len_unicode]);
FriBidiParType base = FRIBIDI_PAR_ON;

fribidi_get_bidi_types(unicode_str.get(), len_unicode, bidi_types.get());
fribidi_get_par_embedding_levels(bidi_types.get(), len_unicode, &base,
levels.get());

fribidi_reorder_line(0, bidi_types.get(), len_unicode, 0, base,
                     levels.get(), unicode_str.get(), NULL);

std::cout << std::hex;
for (int i = 0; i < len_unicode; ++i)
  {
    std::cout << "\\u" << unicode_str[i];
  }
std::cout << std::endl;


Output:
\u1f3fb\u1f476\u20\u631\u627\u628\u62a\u62e\u627

As you can see the tone modifier U+1f3fb is first and then the emoji
U+1f476 is next.
I've also tested this with log2vis().

Is this a bug? If not, what is the correct way to handle emojis?

Regards,
Romain Ouabdelkader.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/fribidi/attachments/20150917/c6f713f6/attachment.html>