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<a href="#harfbuzz-hb-ot-layout.description" class="shortcut">Description</a></span>
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<a name="harfbuzz-hb-ot-layout"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="harfbuzz-hb-ot-layout.top_of_page"></a>hb-ot-layout</span></h2>
<p>hb-ot-layout — OpenType Layout</p>
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<div class="refsect1">
<a name="harfbuzz-hb-ot-layout.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="returnvalue">hb_language_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-tag-to-language" title="hb_ot_tag_to_language ()">hb_ot_tag_to_language</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="returnvalue">hb_script_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-tag-to-script" title="hb_ot_tag_to_script ()">hb_ot_tag_to_script</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-tags-from-script-and-language" title="hb_ot_tags_from_script_and_language ()">hb_ot_tags_from_script_and_language</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-tags-to-script-and-language" title="hb_ot_tags_to_script_and_language ()">hb_ot_tags_to_script_and_language</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-collect-lookups" title="hb_ot_layout_collect_lookups ()">hb_ot_layout_collect_lookups</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-collect-features" title="hb_ot_layout_collect_features ()">hb_ot_layout_collect_features</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-collect-features-map" title="hb_ot_layout_collect_features_map ()">hb_ot_layout_collect_features_map</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-feature-get-characters" title="hb_ot_layout_feature_get_characters ()">hb_ot_layout_feature_get_characters</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-feature-get-lookups" title="hb_ot_layout_feature_get_lookups ()">hb_ot_layout_feature_get_lookups</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-feature-get-name-ids" title="hb_ot_layout_feature_get_name_ids ()">hb_ot_layout_feature_get_name_ids</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-feature-with-variations-get-lookups" title="hb_ot_layout_feature_with_variations_get_lookups ()">hb_ot_layout_feature_with_variations_get_lookups</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-attach-points" title="hb_ot_layout_get_attach_points ()">hb_ot_layout_get_attach_points</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-font-extents" title="hb_ot_layout_get_font_extents ()">hb_ot_layout_get_font_extents</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-font-extents2" title="hb_ot_layout_get_font_extents2 ()">hb_ot_layout_get_font_extents2</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-baseline-tag-t" title="enum hb_ot_layout_baseline_tag_t"><span class="returnvalue">hb_ot_layout_baseline_tag_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-horizontal-baseline-tag-for-script" title="hb_ot_layout_get_horizontal_baseline_tag_for_script ()">hb_ot_layout_get_horizontal_baseline_tag_for_script</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-baseline" title="hb_ot_layout_get_baseline ()">hb_ot_layout_get_baseline</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-baseline2" title="hb_ot_layout_get_baseline2 ()">hb_ot_layout_get_baseline2</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-baseline-with-fallback" title="hb_ot_layout_get_baseline_with_fallback ()">hb_ot_layout_get_baseline_with_fallback</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-baseline-with-fallback2" title="hb_ot_layout_get_baseline_with_fallback2 ()">hb_ot_layout_get_baseline_with_fallback2</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-glyph-class-t" title="enum hb_ot_layout_glyph_class_t"><span class="returnvalue">hb_ot_layout_glyph_class_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-glyph-class" title="hb_ot_layout_get_glyph_class ()">hb_ot_layout_get_glyph_class</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-glyphs-in-class" title="hb_ot_layout_get_glyphs_in_class ()">hb_ot_layout_get_glyphs_in_class</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-ligature-carets" title="hb_ot_layout_get_ligature_carets ()">hb_ot_layout_get_ligature_carets</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-size-params" title="hb_ot_layout_get_size_params ()">hb_ot_layout_get_size_params</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-has-glyph-classes" title="hb_ot_layout_has_glyph_classes ()">hb_ot_layout_has_glyph_classes</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-has-positioning" title="hb_ot_layout_has_positioning ()">hb_ot_layout_has_positioning</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-has-substitution" title="hb_ot_layout_has_substitution ()">hb_ot_layout_has_substitution</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-language-find-feature" title="hb_ot_layout_language_find_feature ()">hb_ot_layout_language_find_feature</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-language-get-feature-indexes" title="hb_ot_layout_language_get_feature_indexes ()">hb_ot_layout_language_get_feature_indexes</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-language-get-feature-tags" title="hb_ot_layout_language_get_feature_tags ()">hb_ot_layout_language_get_feature_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-language-get-required-feature" title="hb_ot_layout_language_get_required_feature ()">hb_ot_layout_language_get_required_feature</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-lookup-collect-glyphs" title="hb_ot_layout_lookup_collect_glyphs ()">hb_ot_layout_lookup_collect_glyphs</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">unsigned</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-lookup-get-glyph-alternates" title="hb_ot_layout_lookup_get_glyph_alternates ()">hb_ot_layout_lookup_get_glyph_alternates</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="returnvalue">hb_position_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-lookup-get-optical-bound" title="hb_ot_layout_lookup_get_optical_bound ()">hb_ot_layout_lookup_get_optical_bound</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-lookup-substitute-closure" title="hb_ot_layout_lookup_substitute_closure ()">hb_ot_layout_lookup_substitute_closure</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-lookups-substitute-closure" title="hb_ot_layout_lookups_substitute_closure ()">hb_ot_layout_lookups_substitute_closure</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-lookup-would-substitute" title="hb_ot_layout_lookup_would_substitute ()">hb_ot_layout_lookup_would_substitute</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-script-find-language" title="hb_ot_layout_script_find_language ()">hb_ot_layout_script_find_language</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-script-get-language-tags" title="hb_ot_layout_script_get_language_tags ()">hb_ot_layout_script_get_language_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-script-select-language" title="hb_ot_layout_script_select_language ()">hb_ot_layout_script_select_language</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-script-select-language2" title="hb_ot_layout_script_select_language2 ()">hb_ot_layout_script_select_language2</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-table-find-feature-variations" title="hb_ot_layout_table_find_feature_variations ()">hb_ot_layout_table_find_feature_variations</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-table-get-feature-tags" title="hb_ot_layout_table_get_feature_tags ()">hb_ot_layout_table_get_feature_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-table-get-script-tags" title="hb_ot_layout_table_get_script_tags ()">hb_ot_layout_table_get_script_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-table-get-lookup-count" title="hb_ot_layout_table_get_lookup_count ()">hb_ot_layout_table_get_lookup_count</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-table-select-script" title="hb_ot_layout_table_select_script ()">hb_ot_layout_table_select_script</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-shape-plan-collect-lookups" title="hb_ot_shape_plan_collect_lookups ()">hb_ot_shape_plan_collect_lookups</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-language-get-required-feature-index" title="hb_ot_layout_language_get_required_feature_index ()">hb_ot_layout_language_get_required_feature_index</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-ot-layout.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-MAX-TAGS-PER-LANGUAGE:CAPS" title="HB_OT_MAX_TAGS_PER_LANGUAGE">HB_OT_MAX_TAGS_PER_LANGUAGE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-MAX-TAGS-PER-SCRIPT:CAPS" title="HB_OT_MAX_TAGS_PER_SCRIPT">HB_OT_MAX_TAGS_PER_SCRIPT</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-DEFAULT-LANGUAGE:CAPS" title="HB_OT_TAG_DEFAULT_LANGUAGE">HB_OT_TAG_DEFAULT_LANGUAGE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-DEFAULT-SCRIPT:CAPS" title="HB_OT_TAG_DEFAULT_SCRIPT">HB_OT_TAG_DEFAULT_SCRIPT</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-LAYOUT-DEFAULT-LANGUAGE-INDEX:CAPS" title="HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX">HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-LAYOUT-NO-FEATURE-INDEX:CAPS" title="HB_OT_LAYOUT_NO_FEATURE_INDEX">HB_OT_LAYOUT_NO_FEATURE_INDEX</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-LAYOUT-NO-SCRIPT-INDEX:CAPS" title="HB_OT_LAYOUT_NO_SCRIPT_INDEX">HB_OT_LAYOUT_NO_SCRIPT_INDEX</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-LAYOUT-NO-VARIATIONS-INDEX:CAPS" title="HB_OT_LAYOUT_NO_VARIATIONS_INDEX">HB_OT_LAYOUT_NO_VARIATIONS_INDEX</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-BASE:CAPS" title="HB_OT_TAG_BASE">HB_OT_TAG_BASE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GDEF:CAPS" title="HB_OT_TAG_GDEF">HB_OT_TAG_GDEF</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS">HB_OT_TAG_GPOS</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB">HB_OT_TAG_GSUB</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-JSTF:CAPS" title="HB_OT_TAG_JSTF">HB_OT_TAG_JSTF</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-baseline-tag-t" title="enum hb_ot_layout_baseline_tag_t">hb_ot_layout_baseline_tag_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-glyph-class-t" title="enum hb_ot_layout_glyph_class_t">hb_ot_layout_glyph_class_t</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-ot-layout.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <hb-ot.h>
</pre>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-ot-layout.description"></a><h2>Description</h2>
<p>Functions for querying OpenType Layout features in the font face.
See the <a class="ulink" href="http://www.microsoft.com/typography/otspec/" target="_top">OpenType specification</a>
for details.</p>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-ot-layout.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="hb-ot-tag-to-language"></a><h3>hb_ot_tag_to_language ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="returnvalue">hb_language_t</span></a>
hb_ot_tag_to_language (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> tag</code></em>);</pre>
<p>Converts a language tag to an <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a>.</p>
<div class="refsect3">
<a name="hb-ot-tag-to-language.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>an language tag</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-tag-to-language.returns"></a><h4>Returns</h4>
<p>The <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> corresponding to <em class="parameter"><code>tag</code></em>
. </p>
<p><span class="annotation">[<acronym title="The data is owned by the callee, which is responsible of freeing it."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-tag-to-script"></a><h3>hb_ot_tag_to_script ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="returnvalue">hb_script_t</span></a>
hb_ot_tag_to_script (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> tag</code></em>);</pre>
<p>Converts a script tag to an <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a>.</p>
<div class="refsect3">
<a name="hb-ot-tag-to-script.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>a script tag</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-tag-to-script.returns"></a><h4>Returns</h4>
<p> The <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> corresponding to <em class="parameter"><code>tag</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-tags-from-script-and-language"></a><h3>hb_ot_tags_from_script_and_language ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_tags_from_script_and_language (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> script</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> language</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *script_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *script_tags</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *language_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *language_tags</code></em>);</pre>
<p>Converts an <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> and an <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> to script and language tags.</p>
<div class="refsect3">
<a name="hb-ot-tags-from-script-and-language.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>an <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> to convert.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language</p></td>
<td class="parameter_description"><p>an <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> to convert. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>script_count</p></td>
<td class="parameter_description"><p>maximum number of script tags to retrieve (IN)
and actual number of script tags retrieved (OUT). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>script_tags</p></td>
<td class="parameter_description"><p>array of size at least <em class="parameter"><code>script_count</code></em>
to store the
script tag results. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>language_count</p></td>
<td class="parameter_description"><p>maximum number of language tags to retrieve
(IN) and actual number of language tags retrieved (OUT). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>language_tags</p></td>
<td class="parameter_description"><p>array of size at least <em class="parameter"><code>language_count</code></em>
to store
the language tag results. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-0-0.html#api-index-2.0.0">2.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-tags-to-script-and-language"></a><h3>hb_ot_tags_to_script_and_language ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_tags_to_script_and_language (<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> script_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> language_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> *script</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> *language</code></em>);</pre>
<p>Converts a script tag and a language tag to an <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> and an
<a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a>.</p>
<div class="refsect3">
<a name="hb-ot-tags-to-script-and-language.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>script_tag</p></td>
<td class="parameter_description"><p>a script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_tag</p></td>
<td class="parameter_description"><p>a language tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>the <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> corresponding to <em class="parameter"><code>script_tag</code></em>
. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>language</p></td>
<td class="parameter_description"><p>the <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> corresponding to <em class="parameter"><code>script_tag</code></em>
and
<em class="parameter"><code>language_tag</code></em>
. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-0-0.html#api-index-2.0.0">2.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-collect-lookups"></a><h3>hb_ot_layout_collect_lookups ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_collect_lookups (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *scripts</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *languages</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *features</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *lookup_indexes</code></em>);</pre>
<p>Fetches a list of all feature-lookup indexes in the specified face's GSUB
table or GPOS table, underneath the specified scripts, languages, and
features. If no list of scripts is provided, all scripts will be queried.
If no list of languages is provided, all languages will be queried. If no
list of features is provided, all features will be queried.</p>
<div class="refsect3">
<a name="hb-ot-layout-collect-lookups.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>scripts</p></td>
<td class="parameter_description"><p>The array of scripts to collect lookups for,
terminated by <a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE"><code class="literal">HB_TAG_NONE</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>languages</p></td>
<td class="parameter_description"><p>The array of languages to collect lookups for,
terminated by <a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE"><code class="literal">HB_TAG_NONE</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>features</p></td>
<td class="parameter_description"><p>The array of features to collect lookups for,
terminated by <a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE"><code class="literal">HB_TAG_NONE</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_indexes</p></td>
<td class="parameter_description"><p>The array of lookup indexes found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-8.html#api-index-0.9.8">0.9.8</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-collect-features"></a><h3>hb_ot_layout_collect_features ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_collect_features (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *scripts</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *languages</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *features</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *feature_indexes</code></em>);</pre>
<p>Fetches a list of all feature indexes in the specified face's GSUB table
or GPOS table, underneath the specified scripts, languages, and features.
If no list of scripts is provided, all scripts will be queried. If no list
of languages is provided, all languages will be queried. If no list of
features is provided, all features will be queried.</p>
<div class="refsect3">
<a name="hb-ot-layout-collect-features.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>scripts</p></td>
<td class="parameter_description"><p>The array of scripts to collect features for,
terminated by <a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE"><code class="literal">HB_TAG_NONE</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>languages</p></td>
<td class="parameter_description"><p>The array of languages to collect features for,
terminated by <a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE"><code class="literal">HB_TAG_NONE</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>features</p></td>
<td class="parameter_description"><p>The array of features to collect,
terminated by <a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE"><code class="literal">HB_TAG_NONE</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>feature_indexes</p></td>
<td class="parameter_description"><p>The set of feature indexes found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-1-8-5.html#api-index-1.8.5">1.8.5</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-collect-features-map"></a><h3>hb_ot_layout_collect_features_map ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_collect_features_map (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code><span class="type">unsigned </span> script_index</code></em>,
<em class="parameter"><code><span class="type">unsigned </span> language_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-map.html#hb-map-t" title="hb_map_t"><span class="type">hb_map_t</span></a> *feature_map</code></em>);</pre>
<p>Fetches the mapping from feature tags to feature indexes for
the specified script and language.</p>
<div class="refsect3">
<a name="hb-ot-layout-collect-features-map.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the requested language tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_map</p></td>
<td class="parameter_description"><p>The map of feature tag to feature index. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-8-1-0.html#api-index-8.1.0">8.1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-feature-get-characters"></a><h3>hb_ot_layout_feature_get_characters ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_feature_get_characters (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> feature_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *char_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> *characters</code></em>);</pre>
<p>Fetches a list of the characters defined as having a variant under the specified
"Character Variant" ("cvXX") feature tag.</p>
<div class="refsect3">
<a name="hb-ot-layout-feature-get-characters.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p>table tag to query, "GSUB" or "GPOS".</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_index</p></td>
<td class="parameter_description"><p>index of feature to query.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first character to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>char_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of characters to return;
Output = the actual number of characters returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>characters</p></td>
<td class="parameter_description"><p>A buffer pointer.
The Unicode codepoints of the characters for which this feature provides
glyph variants. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=char_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-feature-get-characters.returns"></a><h4>Returns</h4>
<p> Number of total sample characters in the cvXX feature.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-0-0.html#api-index-2.0.0">2.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-feature-get-lookups"></a><h3>hb_ot_layout_feature_get_lookups ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_feature_get_lookups (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> feature_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *lookup_count</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *lookup_indexes</code></em>);</pre>
<p>Fetches a list of all lookups enumerated for the specified feature, in
the specified face's GSUB table or GPOS table. The list returned will
begin at the offset provided.</p>
<div class="refsect3">
<a name="hb-ot-layout-feature-get-lookups.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_index</p></td>
<td class="parameter_description"><p>The index of the requested feature</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first lookup to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of lookups to return;
Output = the actual number of lookups returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_indexes</p></td>
<td class="parameter_description"><p>The array of lookup indexes found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=lookup_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-feature-get-lookups.returns"></a><h4>Returns</h4>
<p> Total number of lookups.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-7.html#api-index-0.9.7">0.9.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-feature-get-name-ids"></a><h3>hb_ot_layout_feature_get_name_ids ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_feature_get_name_ids (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> feature_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-name.html#hb-ot-name-id-t" title="hb_ot_name_id_t"><span class="type">hb_ot_name_id_t</span></a> *label_id</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-name.html#hb-ot-name-id-t" title="hb_ot_name_id_t"><span class="type">hb_ot_name_id_t</span></a> *tooltip_id</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-name.html#hb-ot-name-id-t" title="hb_ot_name_id_t"><span class="type">hb_ot_name_id_t</span></a> *sample_id</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *num_named_parameters</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-name.html#hb-ot-name-id-t" title="hb_ot_name_id_t"><span class="type">hb_ot_name_id_t</span></a> *first_param_id</code></em>);</pre>
<p>Fetches name indices from feature parameters for "Stylistic Set" ('ssXX') or
"Character Variant" ('cvXX') features.</p>
<div class="refsect3">
<a name="hb-ot-layout-feature-get-name-ids.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p>table tag to query, "GSUB" or "GPOS".</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_index</p></td>
<td class="parameter_description"><p>index of feature to query.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>label_id</p></td>
<td class="parameter_description"><p>The ‘name’ table name ID that specifies a string
for a user-interface label for this feature. (May be NULL.). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>tooltip_id</p></td>
<td class="parameter_description"><p>The ‘name’ table name ID that specifies a string
that an application can use for tooltip text for this
feature. (May be NULL.). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>sample_id</p></td>
<td class="parameter_description"><p>The ‘name’ table name ID that specifies sample text
that illustrates the effect of this feature. (May be NULL.). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>num_named_parameters</p></td>
<td class="parameter_description"><p>Number of named parameters. (May be zero.). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>first_param_id</p></td>
<td class="parameter_description"><p>The first ‘name’ table name ID used to specify
strings for user-interface labels for the feature
parameters. (Must be zero if numParameters is zero.). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-feature-get-name-ids.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if data found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-0-0.html#api-index-2.0.0">2.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-feature-with-variations-get-lookups"></a><h3>hb_ot_layout_feature_with_variations_get_lookups ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_feature_with_variations_get_lookups
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> feature_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> variations_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *lookup_count</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *lookup_indexes</code></em>);</pre>
<p>Fetches a list of all lookups enumerated for the specified feature, in
the specified face's GSUB table or GPOS table, enabled at the specified
variations index. The list returned will begin at the offset provided.</p>
<div class="refsect3">
<a name="hb-ot-layout-feature-with-variations-get-lookups.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_index</p></td>
<td class="parameter_description"><p>The index of the feature to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>variations_index</p></td>
<td class="parameter_description"><p>The index of the feature variation to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first lookup to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of lookups to return;
Output = the actual number of lookups returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_indexes</p></td>
<td class="parameter_description"><p>The array of lookups found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=lookup_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-feature-with-variations-get-lookups.returns"></a><h4>Returns</h4>
<p> Total number of lookups.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-1-4-0.html#api-index-1.4.0">1.4.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-attach-points"></a><h3>hb_ot_layout_get_attach_points ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_get_attach_points (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> glyph</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *point_count</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *point_array</code></em>);</pre>
<p>Fetches a list of all attachment points for the specified glyph in the GDEF
table of the face. The list returned will begin at the offset provided.</p>
<p>Useful if the client program wishes to cache the list.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-attach-points.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyph</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> code point to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first attachment point to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>point_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of attachment points to return;
Output = the actual number of attachment points returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>point_array</p></td>
<td class="parameter_description"><p>The array of attachment points found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=point_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-attach-points.returns"></a><h4>Returns</h4>
<p> Total number of attachment points for <em class="parameter"><code>glyph</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-font-extents"></a><h3>hb_ot_layout_get_font_extents ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_get_font_extents (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> script_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> language_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-extents-t" title="hb_font_extents_t"><span class="type">hb_font_extents_t</span></a> *extents</code></em>);</pre>
<p>Fetches script/language-specific font extents. These values are
looked up in the <code class="literal">BASE</code> table's <code class="literal">MinMax</code> records.</p>
<p>If no such extents are found, the default extents for the font are
fetched. As such, the return value of this function can for the
most part be ignored. Note that the per-script/language extents
do not have a line-gap value, and the line-gap is set to zero in
that case.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-font-extents.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<td class="parameter_description"><p>a font</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>text direction.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_tag</p></td>
<td class="parameter_description"><p>script tag.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_tag</p></td>
<td class="parameter_description"><p>language tag.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>extents</p></td>
<td class="parameter_description"><p>font extents if found. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-font-extents.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if found script/language-specific font extents.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-8-0-0.html#api-index-8.0.0">8.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-font-extents2"></a><h3>hb_ot_layout_get_font_extents2 ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_get_font_extents2 (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> script</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> language</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-extents-t" title="hb_font_extents_t"><span class="type">hb_font_extents_t</span></a> *extents</code></em>);</pre>
<p>Fetches script/language-specific font extents. These values are
looked up in the <code class="literal">BASE</code> table's <code class="literal">MinMax</code> records.</p>
<p>If no such extents are found, the default extents for the font are
fetched. As such, the return value of this function can for the
most part be ignored. Note that the per-script/language extents
do not have a line-gap value, and the line-gap is set to zero in
that case.</p>
<p>This function is like <a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-font-extents" title="hb_ot_layout_get_font_extents ()"><code class="function">hb_ot_layout_get_font_extents()</code></a> but takes
<a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> and <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> instead of OpenType <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a>.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-font-extents2.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<td class="parameter_description"><p>a font</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>text direction.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>script.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language</p></td>
<td class="parameter_description"><p>language. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>extents</p></td>
<td class="parameter_description"><p>font extents if found. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-font-extents2.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if found script/language-specific font extents.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-8-0-0.html#api-index-8.0.0">8.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-horizontal-baseline-tag-for-script"></a><h3>hb_ot_layout_get_horizontal_baseline_tag_for_script ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-baseline-tag-t" title="enum hb_ot_layout_baseline_tag_t"><span class="returnvalue">hb_ot_layout_baseline_tag_t</span></a>
hb_ot_layout_get_horizontal_baseline_tag_for_script
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> script</code></em>);</pre>
<p>Fetches the dominant horizontal baseline tag used by <em class="parameter"><code>script</code></em>
.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-horizontal-baseline-tag-for-script.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>a script tag.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-horizontal-baseline-tag-for-script.returns"></a><h4>Returns</h4>
<p> dominant baseline tag for the <em class="parameter"><code>script</code></em>
.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-4-0-0.html#api-index-4.0.0">4.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-baseline"></a><h3>hb_ot_layout_get_baseline ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_get_baseline (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-baseline-tag-t" title="enum hb_ot_layout_baseline_tag_t"><span class="type">hb_ot_layout_baseline_tag_t</span></a> baseline_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> script_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> language_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="type">hb_position_t</span></a> *coord</code></em>);</pre>
<p>Fetches a baseline value from the face.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-baseline.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<td class="parameter_description"><p>a font</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>baseline_tag</p></td>
<td class="parameter_description"><p>a baseline tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>text direction.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_tag</p></td>
<td class="parameter_description"><p>script tag.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_tag</p></td>
<td class="parameter_description"><p>language tag, currently unused.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>coord</p></td>
<td class="parameter_description"><p>baseline value if found. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-baseline.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if found baseline value in the font.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-6-0.html#api-index-2.6.0">2.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-baseline2"></a><h3>hb_ot_layout_get_baseline2 ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_get_baseline2 (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-baseline-tag-t" title="enum hb_ot_layout_baseline_tag_t"><span class="type">hb_ot_layout_baseline_tag_t</span></a> baseline_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> script</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> language</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="type">hb_position_t</span></a> *coord</code></em>);</pre>
<p>Fetches a baseline value from the face.</p>
<p>This function is like <a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-baseline" title="hb_ot_layout_get_baseline ()"><code class="function">hb_ot_layout_get_baseline()</code></a> but takes
<a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> and <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> instead of OpenType <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a>.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-baseline2.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<td class="parameter_description"><p>a font</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>baseline_tag</p></td>
<td class="parameter_description"><p>a baseline tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>text direction.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>script.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language</p></td>
<td class="parameter_description"><p>language, currently unused. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>coord</p></td>
<td class="parameter_description"><p>baseline value if found. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-baseline2.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if found baseline value in the font.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-8-0-0.html#api-index-8.0.0">8.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-baseline-with-fallback"></a><h3>hb_ot_layout_get_baseline_with_fallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_get_baseline_with_fallback
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-baseline-tag-t" title="enum hb_ot_layout_baseline_tag_t"><span class="type">hb_ot_layout_baseline_tag_t</span></a> baseline_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> script_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> language_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="type">hb_position_t</span></a> *coord</code></em>);</pre>
<p>Fetches a baseline value from the face, and synthesizes
it if the font does not have it.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-baseline-with-fallback.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<td class="parameter_description"><p>a font</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>baseline_tag</p></td>
<td class="parameter_description"><p>a baseline tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>text direction.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_tag</p></td>
<td class="parameter_description"><p>script tag.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_tag</p></td>
<td class="parameter_description"><p>language tag, currently unused.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>coord</p></td>
<td class="parameter_description"><p>baseline value if found. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-4-0-0.html#api-index-4.0.0">4.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-baseline-with-fallback2"></a><h3>hb_ot_layout_get_baseline_with_fallback2 ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_get_baseline_with_fallback2
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-baseline-tag-t" title="enum hb_ot_layout_baseline_tag_t"><span class="type">hb_ot_layout_baseline_tag_t</span></a> baseline_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> script</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> language</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="type">hb_position_t</span></a> *coord</code></em>);</pre>
<p>Fetches a baseline value from the face, and synthesizes
it if the font does not have it.</p>
<p>This function is like <a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-get-baseline-with-fallback" title="hb_ot_layout_get_baseline_with_fallback ()"><code class="function">hb_ot_layout_get_baseline_with_fallback()</code></a> but takes
<a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a> and <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a> instead of OpenType <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a>.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-baseline-with-fallback2.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<td class="parameter_description"><p>a font</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>baseline_tag</p></td>
<td class="parameter_description"><p>a baseline tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>text direction.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>script.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language</p></td>
<td class="parameter_description"><p>language, currently unused. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>coord</p></td>
<td class="parameter_description"><p>baseline value if found. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-8-0-0.html#api-index-8.0.0">8.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-glyph-class"></a><h3>hb_ot_layout_get_glyph_class ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-glyph-class-t" title="enum hb_ot_layout_glyph_class_t"><span class="returnvalue">hb_ot_layout_glyph_class_t</span></a>
hb_ot_layout_get_glyph_class (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> glyph</code></em>);</pre>
<p>Fetches the GDEF class of the requested glyph in the specified face.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-glyph-class.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyph</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> code point to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-glyph-class.returns"></a><h4>Returns</h4>
<p> The <a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-glyph-class-t" title="enum hb_ot_layout_glyph_class_t"><span class="type">hb_ot_layout_glyph_class_t</span></a> glyph class of the given code
point in the GDEF table of the face.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-7.html#api-index-0.9.7">0.9.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-glyphs-in-class"></a><h3>hb_ot_layout_get_glyphs_in_class ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_get_glyphs_in_class (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-glyph-class-t" title="enum hb_ot_layout_glyph_class_t"><span class="type">hb_ot_layout_glyph_class_t</span></a> klass</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *glyphs</code></em>);</pre>
<p>Retrieves the set of all glyphs from the face that belong to the requested
glyph class in the face's GDEF table.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-glyphs-in-class.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>klass</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-ot-layout.html#hb-ot-layout-glyph-class-t" title="enum hb_ot_layout_glyph_class_t"><span class="type">hb_ot_layout_glyph_class_t</span></a> GDEF class to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> set of all glyphs belonging to the requested
class. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-7.html#api-index-0.9.7">0.9.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-ligature-carets"></a><h3>hb_ot_layout_get_ligature_carets ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_get_ligature_carets (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> glyph</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *caret_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="type">hb_position_t</span></a> *caret_array</code></em>);</pre>
<p>Fetches a list of the caret positions defined for a ligature glyph in the GDEF
table of the font. The list returned will begin at the offset provided.</p>
<p>Note that a ligature that is formed from n characters will have n-1
caret positions. The first character is not represented in the array,
since its caret position is the glyph position.</p>
<p>The positions returned by this function are 'unshaped', and will have to
be fixed up for kerning that may be applied to the ligature glyph.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-ligature-carets.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> to work on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> text direction to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyph</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> code point to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first caret position to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caret_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of caret positions to return;
Output = the actual number of caret positions returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>caret_array</p></td>
<td class="parameter_description"><p>The array of caret positions found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=caret_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-ligature-carets.returns"></a><h4>Returns</h4>
<p> Total number of ligature caret positions for <em class="parameter"><code>glyph</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-get-size-params"></a><h3>hb_ot_layout_get_size_params ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_get_size_params (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *design_size</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *subfamily_id</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-ot-name.html#hb-ot-name-id-t" title="hb_ot_name_id_t"><span class="type">hb_ot_name_id_t</span></a> *subfamily_name_id</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *range_start</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *range_end</code></em>);</pre>
<p>Fetches optical-size feature data (i.e., the <code class="literal">size</code> feature from GPOS). Note that
the subfamily_id and the subfamily name string (accessible via the subfamily_name_id)
as used here are defined as pertaining only to fonts within a font family that differ
specifically in their respective size ranges; other ways to differentiate fonts within
a subfamily are not covered by the <code class="literal">size</code> feature.</p>
<p>For more information on this distinction, see the <a class="ulink" href="https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#tag-size" target="_top"><code class="literal">size</code> feature documentation</a>.</p>
<div class="refsect3">
<a name="hb-ot-layout-get-size-params.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>design_size</p></td>
<td class="parameter_description"><p>The design size of the face. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>subfamily_id</p></td>
<td class="parameter_description"><p>The identifier of the face within the font subfamily. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>subfamily_name_id</p></td>
<td class="parameter_description"><p>The ‘name’ table name ID of the face within the font subfamily. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>range_start</p></td>
<td class="parameter_description"><p>The minimum size of the recommended size range for the face. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>range_end</p></td>
<td class="parameter_description"><p>The maximum size of the recommended size range for the face. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-get-size-params.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if data found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-10.html#api-index-0.9.10">0.9.10</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-has-glyph-classes"></a><h3>hb_ot_layout_has_glyph_classes ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_has_glyph_classes (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>);</pre>
<p>Tests whether a face has any glyph classes defined in its GDEF table.</p>
<div class="refsect3">
<a name="hb-ot-layout-has-glyph-classes.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-has-glyph-classes.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if data found, <code class="literal">false</code> otherwise</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-has-positioning"></a><h3>hb_ot_layout_has_positioning ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_has_positioning (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>);</pre>
<p>Tests whether the specified face includes any GPOS positioning.</p>
<div class="refsect3">
<a name="hb-ot-layout-has-positioning.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-has-positioning.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if the face has GPOS data, <code class="literal">false</code> otherwise</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-has-substitution"></a><h3>hb_ot_layout_has_substitution ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_has_substitution (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>);</pre>
<p>Tests whether the specified face includes any GSUB substitutions.</p>
<div class="refsect3">
<a name="hb-ot-layout-has-substitution.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-has-substitution.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if data found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-language-find-feature"></a><h3>hb_ot_layout_language_find_feature ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_language_find_feature (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> language_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> feature_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *feature_index</code></em>);</pre>
<p>Fetches the index of a given feature tag in the specified face's GSUB table
or GPOS table, underneath the specified script and language.</p>
<div class="refsect3">
<a name="hb-ot-layout-language-find-feature.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the requested language tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> of the feature tag requested</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_index</p></td>
<td class="parameter_description"><p>The index of the requested feature. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-language-find-feature.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if the feature is found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-language-get-feature-indexes"></a><h3>hb_ot_layout_language_get_feature_indexes ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_language_get_feature_indexes
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> language_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *feature_count</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *feature_indexes</code></em>);</pre>
<p>Fetches a list of all features in the specified face's GSUB table
or GPOS table, underneath the specified script and language. The list
returned will begin at the offset provided.</p>
<div class="refsect3">
<a name="hb-ot-layout-language-get-feature-indexes.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the requested language tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first feature tag to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of feature tags to return;
Output: the actual number of feature tags returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>feature_indexes</p></td>
<td class="parameter_description"><p>The array of feature indexes found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=feature_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-language-get-feature-indexes.returns"></a><h4>Returns</h4>
<p> Total number of features.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-language-get-feature-tags"></a><h3>hb_ot_layout_language_get_feature_tags ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_language_get_feature_tags
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> language_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *feature_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *feature_tags</code></em>);</pre>
<p>Fetches a list of all features in the specified face's GSUB table
or GPOS table, underneath the specified script and language. The list
returned will begin at the offset provided.</p>
<div class="refsect3">
<a name="hb-ot-layout-language-get-feature-tags.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the requested language tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first feature tag to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of feature tags to return;
Output = the actual number of feature tags returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>feature_tags</p></td>
<td class="parameter_description"><p>The array of <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> feature tags found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=feature_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-language-get-feature-tags.returns"></a><h4>Returns</h4>
<p> Total number of feature tags.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-language-get-required-feature"></a><h3>hb_ot_layout_language_get_required_feature ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_language_get_required_feature
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> language_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *feature_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *feature_tag</code></em>);</pre>
<p>Fetches the tag of a requested feature index in the given face's GSUB or GPOS table,
underneath the specified script and language.</p>
<div class="refsect3">
<a name="hb-ot-layout-language-get-required-feature.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the requested language tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_index</p></td>
<td class="parameter_description"><p>The index of the requested feature. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>feature_tag</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> of the requested feature. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-language-get-required-feature.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if the feature is found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-30.html#api-index-0.9.30">0.9.30</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-lookup-collect-glyphs"></a><h3>hb_ot_layout_lookup_collect_glyphs ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_lookup_collect_glyphs (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> lookup_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *glyphs_before</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *glyphs_input</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *glyphs_after</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *glyphs_output</code></em>);</pre>
<p>Fetches a list of all glyphs affected by the specified lookup in the
specified face's GSUB table or GPOS table.</p>
<div class="refsect3">
<a name="hb-ot-layout-lookup-collect-glyphs.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_index</p></td>
<td class="parameter_description"><p>The index of the feature lookup to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs_before</p></td>
<td class="parameter_description"><p>Array of glyphs preceding the substitution range. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs_input</p></td>
<td class="parameter_description"><p>Array of input glyphs that would be substituted by the lookup. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs_after</p></td>
<td class="parameter_description"><p>Array of glyphs following the substitution range. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs_output</p></td>
<td class="parameter_description"><p>Array of glyphs that would be the substituted output of the lookup. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-7.html#api-index-0.9.7">0.9.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-lookup-get-glyph-alternates"></a><h3>hb_ot_layout_lookup_get_glyph_alternates ()</h3>
<pre class="programlisting"><span class="returnvalue">unsigned</span>
hb_ot_layout_lookup_get_glyph_alternates
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><span class="type">unsigned </span> lookup_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> glyph</code></em>,
<em class="parameter"><code><span class="type">unsigned </span> start_offset</code></em>,
<em class="parameter"><code><span class="type">unsigned</span> *alternate_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> *alternate_glyphs</code></em>);</pre>
<p>Fetches alternates of a glyph from a given GSUB lookup index.</p>
<div class="refsect3">
<a name="hb-ot-layout-lookup-get-glyph-alternates.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p>a face.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_index</p></td>
<td class="parameter_description"><p>index of the feature lookup to query.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyph</p></td>
<td class="parameter_description"><p>a glyph id.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>starting offset.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>alternate_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of alternate glyphs to return;
Output = the actual number of alternate glyphs returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>alternate_glyphs</p></td>
<td class="parameter_description"><p>A glyphs buffer.
Alternate glyphs associated with the glyph id. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=alternate_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-lookup-get-glyph-alternates.returns"></a><h4>Returns</h4>
<p> Total number of alternates found in the specific lookup index for the given glyph id.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-6-8.html#api-index-2.6.8">2.6.8</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-lookup-get-optical-bound"></a><h3>hb_ot_layout_lookup_get_optical_bound ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-position-t" title="hb_position_t"><span class="returnvalue">hb_position_t</span></a>
hb_ot_layout_lookup_get_optical_bound (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t" title="hb_font_t"><span class="type">hb_font_t</span></a> *font</code></em>,
<em class="parameter"><code><span class="type">unsigned </span> lookup_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-direction-t" title="enum hb_direction_t"><span class="type">hb_direction_t</span></a> direction</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> glyph</code></em>);</pre>
<p>Fetches the optical bound of a glyph positioned at the margin of text.
The direction identifies which edge of the glyph to query.</p>
<div class="refsect3">
<a name="hb-ot-layout-lookup-get-optical-bound.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<td class="parameter_description"><p>a font.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_index</p></td>
<td class="parameter_description"><p>index of the feature lookup to query.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>direction</p></td>
<td class="parameter_description"><p>edge of the glyph to query.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyph</p></td>
<td class="parameter_description"><p>a glyph id.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-lookup-get-optical-bound.returns"></a><h4>Returns</h4>
<p> Adjustment value. Negative values mean the glyph will stick out of the margin.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-5-3-0.html#api-index-5.3.0">5.3.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-lookup-substitute-closure"></a><h3>hb_ot_layout_lookup_substitute_closure ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_lookup_substitute_closure
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> lookup_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *glyphs</code></em>);</pre>
<p>Compute the transitive closure of glyphs needed for a
specified lookup.</p>
<div class="refsect3">
<a name="hb-ot-layout-lookup-substitute-closure.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_index</p></td>
<td class="parameter_description"><p>index of the feature lookup to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs</p></td>
<td class="parameter_description"><p>Array of glyphs comprising the transitive closure of the lookup. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-7.html#api-index-0.9.7">0.9.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-lookups-substitute-closure"></a><h3>hb_ot_layout_lookups_substitute_closure ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_layout_lookups_substitute_closure
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *lookups</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *glyphs</code></em>);</pre>
<p>Compute the transitive closure of glyphs needed for all of the
provided lookups.</p>
<div class="refsect3">
<a name="hb-ot-layout-lookups-substitute-closure.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookups</p></td>
<td class="parameter_description"><p>The set of lookups to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs</p></td>
<td class="parameter_description"><p>Array of glyphs comprising the transitive closure of the lookups. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-1-8-1.html#api-index-1.8.1">1.8.1</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-lookup-would-substitute"></a><h3>hb_ot_layout_lookup_would_substitute ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_lookup_would_substitute (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> lookup_index</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-codepoint-t" title="hb_codepoint_t"><span class="type">hb_codepoint_t</span></a> *glyphs</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> glyphs_length</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="type">hb_bool_t</span></a> zero_context</code></em>);</pre>
<p>Tests whether a specified lookup in the specified face would
trigger a substitution on the given glyph sequence.</p>
<div class="refsect3">
<a name="hb-ot-layout-lookup-would-substitute.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_index</p></td>
<td class="parameter_description"><p>The index of the lookup to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs</p></td>
<td class="parameter_description"><p>The sequence of glyphs to query for substitution</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>glyphs_length</p></td>
<td class="parameter_description"><p>The length of the glyph sequence</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>zero_context</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="type">hb_bool_t</span></a> indicating whether pre-/post-context are disallowed
in substitutions</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-lookup-would-substitute.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if a substitution would be triggered, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-7.html#api-index-0.9.7">0.9.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-script-find-language"></a><h3>hb_ot_layout_script_find_language ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_script_find_language (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> language_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *language_index</code></em>);</pre>
<div class="warning"><p><code class="literal">hb_ot_layout_script_find_language</code> has been deprecated since version 2.0.0 and should not be used in newly-written code.</p></div>
<p>Fetches the index of a given language tag in the specified face's GSUB table
or GPOS table, underneath the specified script tag.</p>
<div class="refsect3">
<a name="hb-ot-layout-script-find-language.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_tag</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> of the requested language</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the requested language</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-script-find-language.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if the language tag is found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-script-get-language-tags"></a><h3>hb_ot_layout_script_get_language_tags ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_script_get_language_tags (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *language_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *language_tags</code></em>);</pre>
<p>Fetches a list of language tags in the given face's GSUB or GPOS table, underneath
the specified script index. The list returned will begin at the offset provided.</p>
<div class="refsect3">
<a name="hb-ot-layout-script-get-language-tags.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first language tag to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of language tags to return;
Output = the actual number of language tags returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>language_tags</p></td>
<td class="parameter_description"><p>Array of language tags found in the table. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=language_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-script-get-language-tags.returns"></a><h4>Returns</h4>
<p> Total number of language tags.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-script-select-language"></a><h3>hb_ot_layout_script_select_language ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_script_select_language (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> language_count</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *language_tags</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *language_index</code></em>);</pre>
<p>Fetches the index of the first language tag fom <em class="parameter"><code>language_tags</code></em>
that is present
in the specified face's GSUB or GPOS table, underneath the specified script
index.</p>
<p>If none of the given language tags is found, <code class="literal">false</code> is returned and
<em class="parameter"><code>language_index</code></em>
is set to the default language index.</p>
<div class="refsect3">
<a name="hb-ot-layout-script-select-language.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_count</p></td>
<td class="parameter_description"><p>The number of languages in the specified script</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_tags</p></td>
<td class="parameter_description"><p>The array of language tags</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the requested language. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-script-select-language.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if one of the given language tags is found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-0-0.html#api-index-2.0.0">2.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-script-select-language2"></a><h3>hb_ot_layout_script_select_language2 ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_script_select_language2 (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> language_count</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *language_tags</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *language_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *chosen_language</code></em>);</pre>
<p>Fetches the index of the first language tag fom <em class="parameter"><code>language_tags</code></em>
that is present
in the specified face's GSUB or GPOS table, underneath the specified script
index.</p>
<p>If none of the given language tags is found, <code class="literal">false</code> is returned and
<em class="parameter"><code>language_index</code></em>
is set to <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-LAYOUT-DEFAULT-LANGUAGE-INDEX:CAPS" title="HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX"><span class="type">HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX</span></a> and
<em class="parameter"><code>chosen_language</code></em>
is set to <a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE"><span class="type">HB_TAG_NONE</span></a>.</p>
<div class="refsect3">
<a name="hb-ot-layout-script-select-language2.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_count</p></td>
<td class="parameter_description"><p>The number of languages in the specified script</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_tags</p></td>
<td class="parameter_description"><p>The array of language tags</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the chosen language. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>chosen_language</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> of the chosen language. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-script-select-language2.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if one of the given language tags is found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-7-0-0.html#api-index-7.0.0">7.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-table-find-feature-variations"></a><h3>hb_ot_layout_table_find_feature_variations ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_table_find_feature_variations
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>const <span class="type">int</span> *coords</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> num_coords</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *variations_index</code></em>);</pre>
<p>Fetches a list of feature variations in the specified face's GSUB table
or GPOS table, at the specified variation coordinates.</p>
<div class="refsect3">
<a name="hb-ot-layout-table-find-feature-variations.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>coords</p></td>
<td class="parameter_description"><p>The variation coordinates to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>num_coords</p></td>
<td class="parameter_description"><p>The number of variation coordinates</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>variations_index</p></td>
<td class="parameter_description"><p>The array of feature variations found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-table-find-feature-variations.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if feature variations were found, <code class="literal">false</code> otherwise.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-1-4-0.html#api-index-1.4.0">1.4.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-table-get-feature-tags"></a><h3>hb_ot_layout_table_get_feature_tags ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_table_get_feature_tags (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *feature_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *feature_tags</code></em>);</pre>
<p>Fetches a list of all feature tags in the given face's GSUB or GPOS table.
Note that there might be duplicate feature tags, belonging to different
script/language-system pairs of the table.</p>
<div class="refsect3">
<a name="hb-ot-layout-table-get-feature-tags.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first feature tag to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of feature tags to return;
Output = the actual number of feature tags returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>feature_tags</p></td>
<td class="parameter_description"><p>Array of feature tags found in the table. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=feature_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-table-get-feature-tags.returns"></a><h4>Returns</h4>
<p> Total number of feature tags.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-table-get-script-tags"></a><h3>hb_ot_layout_table_get_script_tags ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_table_get_script_tags (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> start_offset</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *script_count</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *script_tags</code></em>);</pre>
<p>Fetches a list of all scripts enumerated in the specified face's GSUB table
or GPOS table. The list returned will begin at the offset provided.</p>
<div class="refsect3">
<a name="hb-ot-layout-table-get-script-tags.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_offset</p></td>
<td class="parameter_description"><p>offset of the first script tag to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_count</p></td>
<td class="parameter_description"><p>Input = the maximum number of script tags to return;
Output = the actual number of script tags returned (may be zero). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>script_tags</p></td>
<td class="parameter_description"><p>The array of <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> script tags found for the query. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=script_count]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-table-get-script-tags.returns"></a><h4>Returns</h4>
<p> Total number of script tags.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-table-get-lookup-count"></a><h3>hb_ot_layout_table_get_lookup_count ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
hb_ot_layout_table_get_lookup_count (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>);</pre>
<p>Fetches the total number of lookups enumerated in the specified
face's GSUB table or GPOS table.</p>
<div class="refsect3">
<a name="hb-ot-layout-table-get-lookup-count.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-table-get-lookup-count.returns"></a><h4>Returns</h4>
<p> Total number of lookups.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-22.html#api-index-0.9.22">0.9.22</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-table-select-script"></a><h3>hb_ot_layout_table_select_script ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_table_select_script (<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_count</code></em>,
<em class="parameter"><code>const <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *script_tags</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *script_index</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> *chosen_script</code></em>);</pre>
<p>Selects an OpenType script for <em class="parameter"><code>table_tag</code></em>
from the <em class="parameter"><code>script_tags</code></em>
array.</p>
<p>If the table does not have any of the requested scripts, then <code class="literal">DFLT</code>,
<code class="literal">dflt</code>, and <code class="literal">latn</code> tags are tried in that order. If the table still does not
have any of these scripts, <em class="parameter"><code>script_index</code></em>
is set to
<a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-LAYOUT-NO-SCRIPT-INDEX:CAPS" title="HB_OT_LAYOUT_NO_SCRIPT_INDEX"><span class="type">HB_OT_LAYOUT_NO_SCRIPT_INDEX</span></a> and <em class="parameter"><code>chosen_script</code></em>
is set to <a class="link" href="harfbuzz-hb-common.html#HB-TAG-NONE:CAPS" title="HB_TAG_NONE"><span class="type">HB_TAG_NONE</span></a>.</p>
<div class="refsect3">
<a name="hb-ot-layout-table-select-script.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_count</p></td>
<td class="parameter_description"><p>Number of script tags in the array</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_tags</p></td>
<td class="parameter_description"><p>Array of <a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> script tags</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>chosen_script</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> of the requested script. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-table-select-script.returns"></a><h4>Returns</h4>
<p><code class="literal">true</code> if one of the requested scripts is selected, <code class="literal">false</code> if a fallback
script is selected or if no scripts are selected.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-0-0.html#api-index-2.0.0">2.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-shape-plan-collect-lookups"></a><h3>hb_ot_shape_plan_collect_lookups ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
hb_ot_shape_plan_collect_lookups (<em class="parameter"><code><a class="link" href="harfbuzz-hb-shape-plan.html#hb-shape-plan-t" title="hb_shape_plan_t"><span class="type">hb_shape_plan_t</span></a> *shape_plan</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> *lookup_indexes</code></em>);</pre>
<p>Computes the complete set of GSUB or GPOS lookups that are applicable
under a given <em class="parameter"><code>shape_plan</code></em>
.</p>
<div class="refsect3">
<a name="hb-ot-shape-plan-collect-lookups.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>shape_plan</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-shape-plan.html#hb-shape-plan-t" title="hb_shape_plan_t"><span class="type">hb_shape_plan_t</span></a> to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p>GSUB or GPOS</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>lookup_indexes</p></td>
<td class="parameter_description"><p>The <a class="link" href="harfbuzz-hb-set.html#hb-set-t" title="hb_set_t"><span class="type">hb_set_t</span></a> set of lookups returned. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-7.html#api-index-0.9.7">0.9.7</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-language-get-required-feature-index"></a><h3>hb_ot_layout_language_get_required_feature_index ()</h3>
<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
hb_ot_layout_language_get_required_feature_index
(<em class="parameter"><code><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> *face</code></em>,
<em class="parameter"><code><a class="link" href="harfbuzz-hb-common.html#hb-tag-t" title="hb_tag_t"><span class="type">hb_tag_t</span></a> table_tag</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> script_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> language_index</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> *feature_index</code></em>);</pre>
<p>Fetches the index of a requested feature in the given face's GSUB or GPOS table,
underneath the specified script and language.</p>
<div class="refsect3">
<a name="hb-ot-layout-language-get-required-feature-index.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>face</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-face.html#hb-face-t" title="hb_face_t"><span class="type">hb_face_t</span></a> to work upon</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>table_tag</p></td>
<td class="parameter_description"><p><a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GSUB:CAPS" title="HB_OT_TAG_GSUB"><span class="type">HB_OT_TAG_GSUB</span></a> or <a class="link" href="harfbuzz-hb-ot-layout.html#HB-OT-TAG-GPOS:CAPS" title="HB_OT_TAG_GPOS"><span class="type">HB_OT_TAG_GPOS</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script_index</p></td>
<td class="parameter_description"><p>The index of the requested script tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>language_index</p></td>
<td class="parameter_description"><p>The index of the requested language tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature_index</p></td>
<td class="parameter_description"><p>The index of the requested feature. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-ot-layout-language-get-required-feature-index.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if the feature is found, <code class="literal">false</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-6-0.html#api-index-0.6.0">0.6.0</a></p>
</div>
</div>
<div class="refsect1">
<a name="harfbuzz-hb-ot-layout.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="HB-OT-MAX-TAGS-PER-LANGUAGE:CAPS"></a><h3>HB_OT_MAX_TAGS_PER_LANGUAGE</h3>
<pre class="programlisting">#define HB_OT_MAX_TAGS_PER_LANGUAGE 3u
</pre>
<p>Maximum number of OpenType tags that can correspond to a give <a class="link" href="harfbuzz-hb-common.html#hb-language-t" title="hb_language_t"><span class="type">hb_language_t</span></a>.</p>
<p class="since">Since: <a class="link" href="api-index-2-0-0.html#api-index-2.0.0">2.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-MAX-TAGS-PER-SCRIPT:CAPS"></a><h3>HB_OT_MAX_TAGS_PER_SCRIPT</h3>
<pre class="programlisting">#define HB_OT_MAX_TAGS_PER_SCRIPT 3u
</pre>
<p>Maximum number of OpenType tags that can correspond to a give <a class="link" href="harfbuzz-hb-common.html#hb-script-t" title="enum hb_script_t"><span class="type">hb_script_t</span></a>.</p>
<p class="since">Since: <a class="link" href="api-index-2-0-0.html#api-index-2.0.0">2.0.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-TAG-DEFAULT-LANGUAGE:CAPS"></a><h3>HB_OT_TAG_DEFAULT_LANGUAGE</h3>
<pre class="programlisting">#define HB_OT_TAG_DEFAULT_LANGUAGE HB_TAG ('d', 'f', 'l', 't')
</pre>
<p>OpenType language tag, <code class="literal">dflt</code>. Not a valid language tag, but some fonts
mistakenly use it.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-TAG-DEFAULT-SCRIPT:CAPS"></a><h3>HB_OT_TAG_DEFAULT_SCRIPT</h3>
<pre class="programlisting">#define HB_OT_TAG_DEFAULT_SCRIPT HB_TAG ('D', 'F', 'L', 'T')
</pre>
<p>OpenType script tag, <code class="literal">DFLT</code>, for features that are not script-specific.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-LAYOUT-DEFAULT-LANGUAGE-INDEX:CAPS"></a><h3>HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX</h3>
<pre class="programlisting">#define HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX 0xFFFFu
</pre>
<p>Special value for language index indicating default or unsupported language.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-LAYOUT-NO-FEATURE-INDEX:CAPS"></a><h3>HB_OT_LAYOUT_NO_FEATURE_INDEX</h3>
<pre class="programlisting">#define HB_OT_LAYOUT_NO_FEATURE_INDEX 0xFFFFu
</pre>
<p>Special value for feature index indicating unsupported feature.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-LAYOUT-NO-SCRIPT-INDEX:CAPS"></a><h3>HB_OT_LAYOUT_NO_SCRIPT_INDEX</h3>
<pre class="programlisting">#define HB_OT_LAYOUT_NO_SCRIPT_INDEX 0xFFFFu
</pre>
<p>Special value for script index indicating unsupported script.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-LAYOUT-NO-VARIATIONS-INDEX:CAPS"></a><h3>HB_OT_LAYOUT_NO_VARIATIONS_INDEX</h3>
<pre class="programlisting">#define HB_OT_LAYOUT_NO_VARIATIONS_INDEX 0xFFFFFFFFu
</pre>
<p>Special value for variations index indicating unsupported variation.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-TAG-BASE:CAPS"></a><h3>HB_OT_TAG_BASE</h3>
<pre class="programlisting">#define HB_OT_TAG_BASE HB_TAG('B','A','S','E')
</pre>
<p>OpenType <a class="ulink" href="https://docs.microsoft.com/en-us/typography/opentype/spec/base" target="_top">Baseline Table</a>.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-TAG-GDEF:CAPS"></a><h3>HB_OT_TAG_GDEF</h3>
<pre class="programlisting">#define HB_OT_TAG_GDEF HB_TAG('G','D','E','F')
</pre>
<p>OpenType <a class="ulink" href="https://docs.microsoft.com/en-us/typography/opentype/spec/gdef" target="_top">Glyph Definition Table</a>.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-TAG-GPOS:CAPS"></a><h3>HB_OT_TAG_GPOS</h3>
<pre class="programlisting">#define HB_OT_TAG_GPOS HB_TAG('G','P','O','S')
</pre>
<p>OpenType <a class="ulink" href="https://docs.microsoft.com/en-us/typography/opentype/spec/gpos" target="_top">Glyph Positioning Table</a>.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-TAG-GSUB:CAPS"></a><h3>HB_OT_TAG_GSUB</h3>
<pre class="programlisting">#define HB_OT_TAG_GSUB HB_TAG('G','S','U','B')
</pre>
<p>OpenType <a class="ulink" href="https://docs.microsoft.com/en-us/typography/opentype/spec/gsub" target="_top">Glyph Substitution Table</a>.</p>
</div>
<hr>
<div class="refsect2">
<a name="HB-OT-TAG-JSTF:CAPS"></a><h3>HB_OT_TAG_JSTF</h3>
<pre class="programlisting">#define HB_OT_TAG_JSTF HB_TAG('J','S','T','F')
</pre>
<p>OpenType <a class="ulink" href="https://docs.microsoft.com/en-us/typography/opentype/spec/jstf" target="_top">Justification Table</a>.</p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-baseline-tag-t"></a><h3>enum hb_ot_layout_baseline_tag_t</h3>
<p>Baseline tags from <a class="ulink" href="https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags" target="_top">Baseline Tags</a> registry.</p>
<div class="refsect3">
<a name="hb-ot-layout-baseline-tag-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-ROMAN:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_ROMAN</p></td>
<td class="enum_member_description">
<p>The baseline used by alphabetic scripts such as Latin, Cyrillic and Greek.
In vertical writing mode, the alphabetic baseline for characters rotated 90 degrees clockwise.
(This would not apply to alphabetic characters that remain upright in vertical writing mode, since these
characters are not rotated.)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-HANGING:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_HANGING</p></td>
<td class="enum_member_description">
<p>The hanging baseline. In horizontal direction, this is the horizontal
line from which syllables seem, to hang in Tibetan and other similar scripts. In vertical writing mode,
for Tibetan (or some other similar script) characters rotated 90 degrees clockwise.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-IDEO-FACE-BOTTOM-OR-LEFT:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT</p></td>
<td class="enum_member_description">
<p>Ideographic character face bottom or left edge,
if the direction is horizontal or vertical, respectively.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-IDEO-FACE-TOP-OR-RIGHT:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT</p></td>
<td class="enum_member_description">
<p>Ideographic character face top or right edge,
if the direction is horizontal or vertical, respectively.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-IDEO-FACE-CENTRAL:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_CENTRAL</p></td>
<td class="enum_member_description">
<p>The center of the ideographic character face. Since: 4.0.0</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-IDEO-EMBOX-BOTTOM-OR-LEFT:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT</p></td>
<td class="enum_member_description">
<p>Ideographic em-box bottom or left edge,
if the direction is horizontal or vertical, respectively.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-IDEO-EMBOX-TOP-OR-RIGHT:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT</p></td>
<td class="enum_member_description">
<p>Ideographic em-box top or right edge baseline,</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-IDEO-EMBOX-CENTRAL:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_CENTRAL</p></td>
<td class="enum_member_description">
<p>The center of the ideographic em-box. Since: 4.0.0
if the direction is horizontal or vertical, respectively.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-BASELINE-TAG-MATH:CAPS"></a>HB_OT_LAYOUT_BASELINE_TAG_MATH</p></td>
<td class="enum_member_description">
<p>The baseline about which mathematical characters are centered.
In vertical writing mode when mathematical characters rotated 90 degrees clockwise, are centered.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-6-0.html#api-index-2.6.0">2.6.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-ot-layout-glyph-class-t"></a><h3>enum hb_ot_layout_glyph_class_t</h3>
<p>The GDEF classes defined for glyphs.</p>
<div class="refsect3">
<a name="hb-ot-layout-glyph-class-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-GLYPH-CLASS-UNCLASSIFIED:CAPS"></a>HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED</p></td>
<td class="enum_member_description">
<p>Glyphs not matching the other classifications</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-GLYPH-CLASS-BASE-GLYPH:CAPS"></a>HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH</p></td>
<td class="enum_member_description">
<p>Spacing, single characters, capable of accepting marks</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-GLYPH-CLASS-LIGATURE:CAPS"></a>HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE</p></td>
<td class="enum_member_description">
<p>Glyphs that represent ligation of multiple characters</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-GLYPH-CLASS-MARK:CAPS"></a>HB_OT_LAYOUT_GLYPH_CLASS_MARK</p></td>
<td class="enum_member_description">
<p>Non-spacing, combining glyphs that represent marks</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="HB-OT-LAYOUT-GLYPH-CLASS-COMPONENT:CAPS"></a>HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT</p></td>
<td class="enum_member_description">
<p>Spacing glyphs that represent part of a single character</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
</div>
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