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| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="id-1.2.4.4"></a>A simple shaping example</h2></div></div></div> |
| <p> |
| Below is the simplest HarfBuzz shaping example possible. |
| </p> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p> |
| Create a buffer and put your text in it. |
| </p></li></ol></div> |
| <pre class="programlisting"> |
| #include <hb.h> |
| hb_buffer_t *buf; |
| buf = hb_buffer_create(); |
| hb_buffer_add_utf8(buf, text, -1, 0, -1); |
| </pre> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem" value="2"><p> |
| Guess the script, language and direction of the buffer. |
| </p></li></ol></div> |
| <pre class="programlisting"> |
| hb_buffer_set_direction(buf, HB_DIRECTION_LTR); |
| hb_buffer_set_script(buf, HB_SCRIPT_LATIN); |
| hb_buffer_set_language(buf, hb_language_from_string("en", -1)); |
| </pre> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem" value="3"><p> |
| Create a face and a font, using FreeType for now. |
| </p></li></ol></div> |
| <pre class="programlisting"> |
| #include <hb-ft.h> |
| FT_New_Face(ft_library, font_path, index, &face); |
| FT_Set_Char_Size(face, 0, 1000, 0, 0); |
| hb_font_t *font = hb_ft_font_create(face); |
| </pre> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem" value="4"><p> |
| Shape! |
| </p></li></ol></div> |
| <pre class="programlisting"> |
| hb_shape(font, buf, NULL, 0); |
| </pre> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem" value="5"><p> |
| Get the glyph and position information. |
| </p></li></ol></div> |
| <pre class="programlisting"> |
| hb_glyph_info_t *glyph_info = hb_buffer_get_glyph_infos(buf, &glyph_count); |
| hb_glyph_position_t *glyph_pos = hb_buffer_get_glyph_positions(buf, &glyph_count); |
| </pre> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem" value="6"><p> |
| Iterate over each glyph. |
| </p></li></ol></div> |
| <pre class="programlisting"> |
| for (i = 0; i < glyph_count; ++i) { |
| glyphid = glyph_info[i].codepoint; |
| x_offset = glyph_pos[i].x_offset / 64.0; |
| y_offset = glyph_pos[i].y_offset / 64.0; |
| x_advance = glyph_pos[i].x_advance / 64.0; |
| y_advance = glyph_pos[i].y_advance / 64.0; |
| draw_glyph(glyphid, cursor_x + x_offset, cursor_y + y_offset); |
| cursor_x += x_advance; |
| cursor_y += y_advance; |
| } |
| </pre> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem" value="7"><p> |
| Tidy up. |
| </p></li></ol></div> |
| <pre class="programlisting"> |
| hb_buffer_destroy(buf); |
| hb_font_destroy(hb_ft_font); |
| </pre> |
| <p> |
| This example shows enough to get us started using HarfBuzz. In |
| the sections that follow, we will use the remainder of |
| HarfBuzz's API to refine and extend the example and improve its |
| text-shaping capabilities. |
| </p> |
| </div> |
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