Hi, I have attached the screenshot with email. As you can see the last word has 2 characters separate which should be attached. A part of code that renders the text in attached images is: hb_buffer_t *buff = hb_buffer_create(); hb_buffer_set_unicode_funcs(buff, hb_icu_get_unicode_funcs()); hb_buffer_set_direction(buff, HB_DIRECTION_RTL); hb_buffer_set_script(buff,HB_SCRIPT_ARABIC); hb_buffer_set_language(buff, hb_language_from_string("ar", 2)); hb_buffer_add_utf32(buff, text,-1 , 0, -1); hb_shape(hb_font, buff, NULL, 0); int num_chars = hb_buffer_get_length(buff); hb_glyph_info_t *glyphInfos = hb_buffer_get_glyph_infos(buff, &num_chars); hb_glyph_position_t *glyphPos = hb_buffer_get_glyph_positions(buff, &num_chars); int count = 0; int dst_ptr = 0; int dst_x = 0; for (;count < num_chars;++count) { int src_y; unsigned int dst_y; glyph_index = glyphInfos[count].codepoint; if (FT_Load_Glyph(ft_face, glyph_index, FT_LOAD_RENDER)) continue; if (FT_Get_Glyph(ft_face->glyph, ft_glyph)) continue; // render glyph at dst_x + glyph_bitmap->left renderGlyph(ft_glyph, dst_x + glyph_bitmap->left); dst_x += ((glyphPos[count].x_advance) >> 6); } Regards, Sami <div class="gmail_quote">On Thu, Jul 12, 2012 at 1:05 AM, Behdad Esfahbod <<a href="mailto:behdad@behdad.org" target="_blank">behdad@behdad.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 07/11/2012 12:10 PM, Samiullah Khawaja wrote: > Hi, > > I am trying to render Arabic text using harfbuzz. The problem is that when i > glue the glyphs using the x_advance most of the glyphs are glued correctly. > but in some cases there is 1 or 2 pixel distance between glyphs. > > I debugged through the harfbuzz code and was able to confirm that the GPOS > table is present in the font face. But the GPOS data doesn't seem to be > applied to the buffer. That is why when i get glyph positions only x_advance > values are there but the x_offset and y_offset values are always 0. > > Am I missing something here? Please help. </div>Easiest if you post sample code and output. I don't think anyone can help you based on the description of the problem. behdad <div class="im"> > Thanks, > Sami > > On Thu, Jul 5, 2012 at 7:43 PM, Samiullah Khawaja <<a href="mailto:sami.khawaja@gmail.com">sami.khawaja@gmail.com</a> </div><div class="im">> <mailto:<a href="mailto:sami.khawaja@gmail.com">sami.khawaja@gmail.com</a>>> wrote: > > Thanks guys. > > I am trying to link ICU with harfbuzz... will update you guys with it. > > Regards, > Sami > > > On Thu, Jul 5, 2012 at 7:37 PM, Behdad Esfahbod <<a href="mailto:behdad@behdad.org">behdad@behdad.org</a> </div><div class="im">> <mailto:<a href="mailto:behdad@behdad.org">behdad@behdad.org</a>>> wrote: > > On 07/05/2012 08:51 AM, Tom Hacohen wrote: > > As for the unicode functions: I think they are used in harfbuzz only for > > script detection, wide-characters and mirrored characters (probably > more), > > More. Fallback mark positioning, cluster formation, normalization. If > you are > willing to give those all up, well, you may as well not use HarfBuzz > to begin > with :). Not exactly that, but close. > > behdad > > > > > -- > Samiullah Khawaja > Software Engineer </div>> email: <a href="mailto:sami.khawaja@gmail.com">sami.khawaja@gmail.com</a> <mailto:<a href="mailto:sami.khawaja@gmail.com">sami.khawaja@gmail.com</a>> > voice: <a href="tel:%2B%2892%29%200321-4184324" value="+923214184324">+(92) 0321-4184324</a> <tel:%2B%2892%29%200321-4184324> <div class="im">> > > > > -- > Samiullah Khawaja > Software Engineer </div>> email: <a href="mailto:sami.khawaja@gmail.com">sami.khawaja@gmail.com</a> <mailto:<a href="mailto:sami.khawaja@gmail.com">sami.khawaja@gmail.com</a>> > voice: <a href="tel:%2B%2892%29%200321-4184324" value="+923214184324">+(92) 0321-4184324</a> </blockquote></div> -- Samiullah Khawaja Software Engineer email: <a href="mailto:sami.khawaja@gmail.com">sami.khawaja@gmail.com</a> voice: +(92) 0321-4184324