<div dir="ltr"><div>Hi,</div><div> </div><div>if I understood you correctly, you're talking about the Unicode code point to glyph mapping (aka logical to visual cluster mapping). If so, it would look like</div><div>{code}</div><div>const uint16_t *string = ..; // UTF-16 string<br>int str_len = ..; // length of `string` buffer</div><div> </div><div>hb_buffer_add_utf16(buffer, string, str_len, 0, str_len);</div><div>..</div><div>hb_shape_full(..);</div><div> </div><div>const uint num_glyphs = hb_buffer_get_length(buffer);</div><div>ensureSpace(num_glyphs); // ensure we have enough space for shaped glyphs and metrics (here we reallocate the `glyphs`, `advances`, and `offsets` buffers, if needed)<br></div><div>ushort *log_clusters = ..;</div><div>uint *glyphs = ..;<div>float *advances = ..;</div><div>float *offsets_x = ..;</div><div>float *offsets_y = ..;</div></div><div> </div><div>// fetch the shaped glyphs and metrics<br>b_glyph_info_t *infos = hb_buffer_get_glyph_infos(buffer, 0);<br>hb_glyph_position_t *positions = hb_buffer_get_glyph_positions(buffer, 0);<br>uint str_pos = 0;<br>uint last_cluster = ~0u;<br>uint last_glyph_pos = 0;<br>for (uint i = 0; i < num_glyphs; ++i) {<br> glyphs[i] = infos[i].codepoint;</div><div> advances[i] = positions[i].x_advance;<br> offsets_x[i] = positions[i].x_offset;<br> offsets_y[i] = positions[i].y_offset;</div><div> </div><div> uint cluster = infos[i].cluster;<br> if (last_cluster != cluster) {<br> // fix up clusters so that the cluster indices will be monotonic<br> // and thus we never return out-of-order indices<br> while (last_cluster++ < cluster && str_pos < str_len)<br> log_clusters[str_pos++] = last_glyph_pos;</div><div> // [last_glyph_pos..i) forms a single glyph cluster; if you have glyph attributes, here you could remember the cluster start for iterating over the glyph clusters later, e.g. attribs[i].clusterStart = true;<br> last_glyph_pos = i;<br> last_cluster = cluster;<br> }<br>}<br>while (str_pos < str_len)<br> log_clusters[str_pos++] = last_glyph_pos;</div><div><div>{code}</div><div> </div></div></div><div class="gmail_extra"><br clear="all"><div>Regards,<br>Konstantin</div>
<br><div class="gmail_quote">2014-10-30 6:50 GMT+04:00 <span dir="ltr"><<a href="mailto:ff.feng@sunmedia.com.cn" target="_blank">ff.feng@sunmedia.com.cn</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font face="sans-serif">Hi !</font>
<br>
<br><font face="sans-serif">I'm developing a font engine with harfbuzz
& freetype for Cambodia. </font>
<br><font face="sans-serif">I can get the correct glyph index array
and position array by harfbuzz. </font>
<br><font face="sans-serif">That's sweet.</font>
<br>
<br><font face="sans-serif">Now I got a problem : I'm wondering
how many unicode(UTF16) form a glyph?</font>
<br><font face="sans-serif">(If I specify a item in the glyph index
array from hb_buffer_get_glyph_infos)</font>
<br>
<br><font face="sans-serif">thanks a lot & sorry for my poor
English.</font>
<br>
<br>
<br><font face="sans-serif">Best regards,</font>
<br>
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