cairo-font-options.xml

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

</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-SUBPIXEL-ORDER-RGB:CAPS" role="constant"/><literal>CAIRO_SUBPIXEL_ORDER_RGB</literal></term>
<listitem><simpara> Subpixel elements are arranged horizontally
  with red at the left
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-SUBPIXEL-ORDER-BGR:CAPS" role="constant"/><literal>CAIRO_SUBPIXEL_ORDER_BGR</literal></term>
<listitem><simpara>  Subpixel elements are arranged horizontally
  with blue at the left
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-SUBPIXEL-ORDER-VRGB:CAPS" role="constant"/><literal>CAIRO_SUBPIXEL_ORDER_VRGB</literal></term>
<listitem><simpara> Subpixel elements are arranged vertically
  with red at the top
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-SUBPIXEL-ORDER-VBGR:CAPS" role="constant"/><literal>CAIRO_SUBPIXEL_ORDER_VBGR</literal></term>
<listitem><simpara> Subpixel elements are arranged vertically
  with blue at the top
</simpara></listitem>
</varlistentry>
</variablelist></refsect2>
<refsect2>
<title><anchor id="cairo-font-options-set-subpixel-order" role="function"/>cairo_font_options_set_subpixel_order ()</title>
<indexterm><primary>cairo_font_options_set_subpixel_order</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_font_options_set_subpixel_order
                                            (<link linkend="cairo-font-options-t">cairo_font_options_t</link> *options,
                                             <link linkend="cairo-subpixel-order-t">cairo_subpixel_order_t</link> subpixel_order);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-font-options-get-subpixel-order" role="function"/>cairo_font_options_get_subpixel_order ()</title>
<indexterm><primary>cairo_font_options_get_subpixel_order</primary></indexterm><programlisting><link linkend="cairo-subpixel-order-t">cairo_subpixel_order_t</link> cairo_font_options_get_subpixel_order
                                            (const <link linkend="cairo-font-options-t">cairo_font_options_t</link> *options);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-hint-style-t" role="enum"/>enum cairo_hint_style_t</title>
<indexterm><primary>cairo_hint_style_t</primary></indexterm><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;
</programlisting>
<para>
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.</para>
<para>

</para><variablelist role="enum">
<varlistentry>
<term><anchor id="CAIRO-HINT-STYLE-DEFAULT:CAPS" role="constant"/><literal>CAIRO_HINT_STYLE_DEFAULT</literal></term>
<listitem><simpara> Use the default hint style for
  for font backend and target device
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-HINT-STYLE-NONE:CAPS" role="constant"/><literal>CAIRO_HINT_STYLE_NONE</literal></term>
<listitem><simpara> Do not hint outlines
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-HINT-STYLE-SLIGHT:CAPS" role="constant"/><literal>CAIRO_HINT_STYLE_SLIGHT</literal></term>
<listitem><simpara> Hint outlines slightly to improve
  contrast while retaining good fidelity to the original
  shapes.
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-HINT-STYLE-MEDIUM:CAPS" role="constant"/><literal>CAIRO_HINT_STYLE_MEDIUM</literal></term>
<listitem><simpara> Hint outlines with medium strength
  giving a compromise between fidelity to the original shapes
  and contrast
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-HINT-STYLE-FULL:CAPS" role="constant"/><literal>CAIRO_HINT_STYLE_FULL</literal></term>
<listitem><simpara> Hint outlines to maximize contrast
</simpara></listitem>
</varlistentry>
</variablelist></refsect2>
<refsect2>
<title><anchor id="cairo-font-options-set-hint-style" role="function"/>cairo_font_options_set_hint_style ()</title>
<indexterm><primary>cairo_font_options_set_hint_style</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_font_options_set_hint_style
                                            (<link linkend="cairo-font-options-t">cairo_font_options_t</link> *options,
                                             <link linkend="cairo-hint-style-t">cairo_hint_style_t</link> hint_style);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-font-options-get-hint-style" role="function"/>cairo_font_options_get_hint_style ()</title>
<indexterm><primary>cairo_font_options_get_hint_style</primary></indexterm><programlisting><link linkend="cairo-hint-style-t">cairo_hint_style_t</link> cairo_font_options_get_hint_style
                                            (const <link linkend="cairo-font-options-t">cairo_font_options_t</link> *options);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-hint-metrics-t" role="enum"/>enum cairo_hint_metrics_t</title>
<indexterm><primary>cairo_hint_metrics_t</primary></indexterm><programlisting>typedef enum _cairo_hint_metrics {
    CAIRO_HINT_METRICS_DEFAULT,
    CAIRO_HINT_METRICS_OFF,
    CAIRO_HINT_METRICS_ON
} cairo_hint_metrics_t;
</programlisting>
<para>
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.</para>
<para>

</para><variablelist role="enum">
<varlistentry>
<term><anchor id="CAIRO-HINT-METRICS-DEFAULT:CAPS" role="constant"/><literal>CAIRO_HINT_METRICS_DEFAULT</literal></term>
<listitem><simpara> Hint metrics in the default
 manner for the font backend and target device
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-HINT-METRICS-OFF:CAPS" role="constant"/><literal>CAIRO_HINT_METRICS_OFF</literal></term>
<listitem><simpara> Do not hint font metrics
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="CAIRO-HINT-METRICS-ON:CAPS" role="constant"/><literal>CAIRO_HINT_METRICS_ON</literal></term>
<listitem><simpara> Hint font metrics
</simpara></listitem>
</varlistentry>
</variablelist></refsect2>
<refsect2>
<title><anchor id="cairo-font-options-set-hint-metrics" role="function"/>cairo_font_options_set_hint_metrics ()</title>
<indexterm><primary>cairo_font_options_set_hint_metrics</primary></indexterm><programlisting><link linkend="void">void</link>        cairo_font_options_set_hint_metrics
                                            (<link linkend="cairo-font-options-t">cairo_font_options_t</link> *options,
                                             <link linkend="cairo-hint-metrics-t">cairo_hint_metrics_t</link> hint_metrics);</programlisting>
</refsect2>
<refsect2>
<title><anchor id="cairo-font-options-get-hint-metrics" role="function"/>cairo_font_options_get_hint_metrics ()</title>
<indexterm><primary>cairo_font_options_get_hint_metrics</primary></indexterm><programlisting><link linkend="cairo-hint-metrics-t">cairo_hint_metrics_t</link> cairo_font_options_get_hint_metrics
                                            (const <link linkend="cairo-font-options-t">cairo_font_options_t</link> *options);</programlisting>
</refsect2>

</refsect1>




</refentry>