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<code class="function">hb_font_get_glyph_from_name_func_t</code>: returns
the glyph index that corresponds to a given glyph name.
</p></li>
+<li class="listitem"><p>
+ <code class="function">hb_font_draw_glyph_func_t</code>: gets the outlines
+ of a glyph (by calling #hb_draw_funcs_t callbacks).
+ </p></li>
+<li class="listitem"><p>
+ <code class="function">hb_font_paint_glyph_func_t</code>: paints a glyph
+ (by calling #hb_paint_funcs_t callbacks).
+ </p></li>
</ul></div>
<p>
- You can fetch the font-functions configuration for a font object
- by calling <code class="function">hb_font_get_font_funcs()</code>:
+ You can create new font-functions by calling
+ <code class="function">hb_font_funcs_create()</code>:
</p>
<pre class="programlisting">
- hb_font_funcs_t *ffunctions;
- ffunctions = hb_font_get_font_funcs (font);
+ hb_font_funcs_t *ffunctions = hb_font_funcs_create ();
+ hb_font_set_funcs (font, ffunctions, font_data, destroy);
</pre>
<p>
- The individual methods can each be replaced with their own setter
+ The individual methods can each be set with their own setter
function, such as
- <code class="function">hb_font_funcs_set_nominal_glyph_func(*ffunctions,
- func, *user_data, destroy)</code>.
+ <code class="function">hb_font_funcs_set_nominal_glyph_func(ffunctions,
+ func, user_data, destroy)</code>.
</p>
<p>
Font-functions structures can be reused for multiple font
programs from changing the configuration and introducing
inconsistencies and errors downstream.
</p>
+<p>
+ To override only some functions while using the default implementation
+ for the others, you will need to create a sub-font. By default, the
+ sub-font uses the font functions of its parent except for the functions
+ that were explicitly set. The following code will override only the
+ <code class="function">hb_font_get_nominal_glyph_func_t</code> for the sub-font:
+ </p>
+<pre class="programlisting">
+ hb_font_t *subfont = hb_font_create_sub_font (font)
+ hb_font_funcs_t *ffunctions = hb_font_funcs_create ();
+ hb_font_funcs_set_nominal_glyph_func (ffunctions, func, user_data, destroy);
+ hb_font_set_funcs (subfont, ffunctions, font_data, destroy);
+ hb_font_funcs_destroy (ffunctions);
+ </pre>
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