cairo-font-options.html

按照官方的说法：Cairo is a vector graphics library with cross-device output support. 翻译过来

</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-SUBPIXEL-ORDER-RGB:CAPS"></a><code class="literal">CAIRO_SUBPIXEL_ORDER_RGB</code></span></td>
<td> Subpixel elements are arranged horizontally
  with red at the left
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-SUBPIXEL-ORDER-BGR:CAPS"></a><code class="literal">CAIRO_SUBPIXEL_ORDER_BGR</code></span></td>
<td>  Subpixel elements are arranged horizontally
  with blue at the left
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-SUBPIXEL-ORDER-VRGB:CAPS"></a><code class="literal">CAIRO_SUBPIXEL_ORDER_VRGB</code></span></td>
<td> Subpixel elements are arranged vertically
  with red at the top
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-SUBPIXEL-ORDER-VBGR:CAPS"></a><code class="literal">CAIRO_SUBPIXEL_ORDER_VBGR</code></span></td>
<td> Subpixel elements are arranged vertically
  with blue at the top
</td>
</tr>
</tbody>
</table></div>
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<div class="refsect2" lang="en">
<a name="id2582742"></a><h3>
<a name="cairo-font-options-set-subpixel-order"></a>cairo_font_options_set_subpixel_order ()</h3>
<a class="indexterm" name="id2582754"></a><pre class="programlisting">void        cairo_font_options_set_subpixel_order
                                            (<a href="cairo-Font-Options.html#cairo-font-options-t">cairo_font_options_t</a> *options,
                                             <a href="cairo-Font-Options.html#cairo-subpixel-order-t">cairo_subpixel_order_t</a> subpixel_order);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2582783"></a><h3>
<a name="cairo-font-options-get-subpixel-order"></a>cairo_font_options_get_subpixel_order ()</h3>
<a class="indexterm" name="id2582796"></a><pre class="programlisting"><a href="cairo-Font-Options.html#cairo-subpixel-order-t">cairo_subpixel_order_t</a> cairo_font_options_get_subpixel_order
                                            (const <a href="cairo-Font-Options.html#cairo-font-options-t">cairo_font_options_t</a> *options);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2582819"></a><h3>
<a name="cairo-hint-style-t"></a>enum cairo_hint_style_t</h3>
<a class="indexterm" name="id2582830"></a><pre class="programlisting">typedef enum _cairo_hint_style {
    CAIRO_HINT_STYLE_DEFAULT,
    CAIRO_HINT_STYLE_NONE,
    CAIRO_HINT_STYLE_SLIGHT,
    CAIRO_HINT_STYLE_MEDIUM,
    CAIRO_HINT_STYLE_FULL
} cairo_hint_style_t;
</pre>
<p>
Specifies the type of hinting to do on font outlines. Hinting
is the process of fitting outlines to the pixel grid in order
to improve the appearance of the result. Since hinting outlines
involves distorting them, it also reduces the faithfulness
to the original outline shapes. Not all of the outline hinting
styles are supported by all font backends.</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><a name="CAIRO-HINT-STYLE-DEFAULT:CAPS"></a><code class="literal">CAIRO_HINT_STYLE_DEFAULT</code></span></td>
<td> Use the default hint style for
  for font backend and target device
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-HINT-STYLE-NONE:CAPS"></a><code class="literal">CAIRO_HINT_STYLE_NONE</code></span></td>
<td> Do not hint outlines
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-HINT-STYLE-SLIGHT:CAPS"></a><code class="literal">CAIRO_HINT_STYLE_SLIGHT</code></span></td>
<td> Hint outlines slightly to improve
  contrast while retaining good fidelity to the original
  shapes.
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-HINT-STYLE-MEDIUM:CAPS"></a><code class="literal">CAIRO_HINT_STYLE_MEDIUM</code></span></td>
<td> Hint outlines with medium strength
  giving a compromise between fidelity to the original shapes
  and contrast
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-HINT-STYLE-FULL:CAPS"></a><code class="literal">CAIRO_HINT_STYLE_FULL</code></span></td>
<td> Hint outlines to maximize contrast
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2582972"></a><h3>
<a name="cairo-font-options-set-hint-style"></a>cairo_font_options_set_hint_style ()</h3>
<a class="indexterm" name="id2582985"></a><pre class="programlisting">void        cairo_font_options_set_hint_style
                                            (<a href="cairo-Font-Options.html#cairo-font-options-t">cairo_font_options_t</a> *options,
                                             <a href="cairo-Font-Options.html#cairo-hint-style-t">cairo_hint_style_t</a> hint_style);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2583016"></a><h3>
<a name="cairo-font-options-get-hint-style"></a>cairo_font_options_get_hint_style ()</h3>
<a class="indexterm" name="id2583030"></a><pre class="programlisting"><a href="cairo-Font-Options.html#cairo-hint-style-t">cairo_hint_style_t</a> cairo_font_options_get_hint_style
                                            (const <a href="cairo-Font-Options.html#cairo-font-options-t">cairo_font_options_t</a> *options);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2583055"></a><h3>
<a name="cairo-hint-metrics-t"></a>enum cairo_hint_metrics_t</h3>
<a class="indexterm" name="id2583066"></a><pre class="programlisting">typedef enum _cairo_hint_metrics {
    CAIRO_HINT_METRICS_DEFAULT,
    CAIRO_HINT_METRICS_OFF,
    CAIRO_HINT_METRICS_ON
} cairo_hint_metrics_t;
</pre>
<p>
Specifies whether to hint font metrics; hinting font metrics
means quantizing them so that they are integer values in
device space. Doing this improves the consistency of
letter and line spacing, however it also means that text
will be laid out differently at different zoom factors.</p>
<p>

</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><a name="CAIRO-HINT-METRICS-DEFAULT:CAPS"></a><code class="literal">CAIRO_HINT_METRICS_DEFAULT</code></span></td>
<td> Hint metrics in the default
 manner for the font backend and target device
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-HINT-METRICS-OFF:CAPS"></a><code class="literal">CAIRO_HINT_METRICS_OFF</code></span></td>
<td> Do not hint font metrics
</td>
</tr>
<tr>
<td>
<span class="term"><a name="CAIRO-HINT-METRICS-ON:CAPS"></a><code class="literal">CAIRO_HINT_METRICS_ON</code></span></td>
<td> Hint font metrics
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2583162"></a><h3>
<a name="cairo-font-options-set-hint-metrics"></a>cairo_font_options_set_hint_metrics ()</h3>
<a class="indexterm" name="id2583175"></a><pre class="programlisting">void        cairo_font_options_set_hint_metrics
                                            (<a href="cairo-Font-Options.html#cairo-font-options-t">cairo_font_options_t</a> *options,
                                             <a href="cairo-Font-Options.html#cairo-hint-metrics-t">cairo_hint_metrics_t</a> hint_metrics);</pre>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2583206"></a><h3>
<a name="cairo-font-options-get-hint-metrics"></a>cairo_font_options_get_hint_metrics ()</h3>
<a class="indexterm" name="id2583220"></a><pre class="programlisting"><a href="cairo-Font-Options.html#cairo-hint-metrics-t">cairo_hint_metrics_t</a> cairo_font_options_get_hint_metrics
                                            (const <a href="cairo-Font-Options.html#cairo-font-options-t">cairo_font_options_t</a> *options);</pre>
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