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Usermanual, fix up userfeatures example code in OpenType features section of shaping chapter.

This commit is contained in:
Nathan Willis 2019-05-11 20:56:55 +01:00
parent 78fcb14db9
commit a29b1de55a
1 changed files with 11 additions and 4 deletions
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15
docs/usermanual-opentype-features.xml
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@ -167,13 +167,20 @@
"discretionary" ligatures in the font: "discretionary" ligatures in the font:
</para> </para>
<programlisting language="C"> <programlisting language="C">
unsigned int num_features = 1; hb_feature_t userfeatures[1];
hb_feature_t userfeatures[num_features];
userfeatures[0].tag = HB_TAG('d','l','i','g'); userfeatures[0].tag = HB_TAG('d','l','i','g');
userfeatures[0].value = 1; userfeatures[0].value = 1;
userfeatures[0].start = 0; userfeatures[0].start = HB_FEATURE_GLOBAL_START;
userfeatures[0].end = (unsigned int) -1; userfeatures[0].end = HB_FEATURE_GLOBAL_END;
</programlisting> </programlisting>
<para>
<literal>HB_FEATURE_GLOBAL_END</literal> and
<literal>HB_FEATURE_GLOBAL_END</literal> are macros we can use
to indicate that the features will be applied to the entire
buffer. We could also have used a literal <literal>0</literal>
for the start and a <literal>-1</literal> to indicate the end of
the buffer (or have selected other start and end positions, if needed).
</para>
<para> <para>
When we pass the <varname>userfeatures</varname> array to When we pass the <varname>userfeatures</varname> array to
<function>hb_shape()</function>, any discretionary ligature <function>hb_shape()</function>, any discretionary ligature