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<title>VipsObject: VIPS Reference Manual</title>
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<a href="#libvips-VipsObject.description" class="shortcut">Description</a></span>
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<h2><span class="refentrytitle"><a name="libvips-VipsObject.top_of_page"></a>VipsObject</span></h2>
<p>VipsObject — the VIPS base object class</p>
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<div class="refsect1">
<a name="libvips-VipsObject.stability-level"></a><h2>Stability Level</h2>
<acronym title="The intention of a Stable interface is to enable arbitrary third parties to
develop applications to these interfaces, release them, and have confidence that
they will run on all minor releases of the product (after the one in which the
interface was introduced, and within the same major release). Even at a major
release, incompatible changes are expected to be rare, and to have strong
justifications.
"><span class="acronym">Stable</span></acronym>, unless otherwise indicated
</div>
<div class="refsect1">
<a name="libvips-VipsObject.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-UNREF:CAPS" title="VIPS_UNREF()">VIPS_UNREF</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-IMAGE:CAPS" title="VIPS_ARG_IMAGE()">VIPS_ARG_IMAGE</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-INTERPOLATE:CAPS" title="VIPS_ARG_INTERPOLATE()">VIPS_ARG_INTERPOLATE</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-BOOL:CAPS" title="VIPS_ARG_BOOL()">VIPS_ARG_BOOL</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-DOUBLE:CAPS" title="VIPS_ARG_DOUBLE()">VIPS_ARG_DOUBLE</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-BOXED:CAPS" title="VIPS_ARG_BOXED()">VIPS_ARG_BOXED</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-INT:CAPS" title="VIPS_ARG_INT()">VIPS_ARG_INT</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-UINT64:CAPS" title="VIPS_ARG_UINT64()">VIPS_ARG_UINT64</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-ENUM:CAPS" title="VIPS_ARG_ENUM()">VIPS_ARG_ENUM</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-FLAGS:CAPS" title="VIPS_ARG_FLAGS()">VIPS_ARG_FLAGS</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-STRING:CAPS" title="VIPS_ARG_STRING()">VIPS_ARG_STRING</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARG-POINTER:CAPS" title="VIPS_ARG_POINTER()">VIPS_ARG_POINTER</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libvips-VipsObject.html#VipsArgumentInstance" title="VipsArgumentInstance"><span class="returnvalue">VipsArgumentInstance</span></a> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips--argument-get-instance" title="vips__argument_get_instance ()">vips__argument_get_instance</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libvips-VipsObject.html#VipsArgument" title="VipsArgument"><span class="returnvalue">VipsArgument</span></a> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips--argument-table-lookup" title="vips__argument_table_lookup ()">vips__argument_table_lookup</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="libvips-VipsObject.html#vips--object-set-member" title="vips__object_set_member ()">vips__object_set_member</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsObject.html#VipsArgumentMapFn" title="VipsArgumentMapFn ()">*VipsArgumentMapFn</a><span class="c_punctuation">)</span> <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="libvips-VipsObject.html#vips-argument-map" title="vips_argument_map ()">vips_argument_map</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsObject.html#VipsArgumentClassMapFn" title="VipsArgumentClassMapFn ()">*VipsArgumentClassMapFn</a><span class="c_punctuation">)</span> <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="libvips-VipsObject.html#vips-argument-class-map" title="vips_argument_class_map ()">vips_argument_class_map</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-argument-class-needsstring" title="vips_argument_class_needsstring ()">vips_argument_class_needsstring</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-get-argument" title="vips_object_get_argument ()">vips_object_get_argument</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-argument-isset" title="vips_object_argument_isset ()">vips_object_argument_isset</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libvips-VipsObject.html#VipsArgumentFlags" title="enum VipsArgumentFlags"><span class="returnvalue">VipsArgumentFlags</span></a>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-get-argument-flags" title="vips_object_get_argument_flags ()">vips_object_get_argument_flags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-get-argument-priority" title="vips_object_get_argument_priority ()">vips_object_get_argument_priority</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARGUMENT-FOR-ALL:CAPS" title="VIPS_ARGUMENT_FOR_ALL()">VIPS_ARGUMENT_FOR_ALL</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARGUMENT-COLLECT-SET:CAPS" title="VIPS_ARGUMENT_COLLECT_SET()">VIPS_ARGUMENT_COLLECT_SET</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#VIPS-ARGUMENT-COLLECT-GET:CAPS" title="VIPS_ARGUMENT_COLLECT_GET()">VIPS_ARGUMENT_COLLECT_GET</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-value-is-null" title="vips_value_is_null ()">vips_value_is_null</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="libvips-VipsObject.html#vips-object-set-property" title="vips_object_set_property ()">vips_object_set_property</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="libvips-VipsObject.html#vips-object-get-property" title="vips_object_get_property ()">vips_object_get_property</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="libvips-VipsObject.html#vips-object-preclose" title="vips_object_preclose ()">vips_object_preclose</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-build" title="vips_object_build ()">vips_object_build</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="libvips-VipsObject.html#vips-object-summary-class" title="vips_object_summary_class ()">vips_object_summary_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="libvips-VipsObject.html#vips-object-summary" title="vips_object_summary ()">vips_object_summary</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="libvips-VipsObject.html#vips-object-dump" title="vips_object_dump ()">vips_object_dump</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="libvips-VipsObject.html#vips-object-print-summary-class" title="vips_object_print_summary_class ()">vips_object_print_summary_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="libvips-VipsObject.html#vips-object-print-summary" title="vips_object_print_summary ()">vips_object_print_summary</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="libvips-VipsObject.html#vips-object-print-dump" title="vips_object_print_dump ()">vips_object_print_dump</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="libvips-VipsObject.html#vips-object-print-name" title="vips_object_print_name ()">vips_object_print_name</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-sanity" title="vips_object_sanity ()">vips_object_sanity</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="libvips-VipsObject.html#vips-object-class-install-argument" title="vips_object_class_install_argument ()">vips_object_class_install_argument</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-set-argument-from-string" title="vips_object_set_argument_from_string ()">vips_object_set_argument_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-argument-needsstring" title="vips_object_argument_needsstring ()">vips_object_argument_needsstring</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-get-argument-to-string" title="vips_object_get_argument_to_string ()">vips_object_get_argument_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-set-required" title="vips_object_set_required ()">vips_object_set_required</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsObject.html#VipsObjectSetArguments" title="VipsObjectSetArguments ()">*VipsObjectSetArguments</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsObject</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-new" title="vips_object_new ()">vips_object_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-set-valist" title="vips_object_set_valist ()">vips_object_set_valist</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-set" title="vips_object_set ()">vips_object_set</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-set-from-string" title="vips_object_set_from_string ()">vips_object_set_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsObject</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-new-from-string" title="vips_object_new_from_string ()">vips_object_new_from_string</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="libvips-VipsObject.html#vips-object-to-string" title="vips_object_to_string ()">vips_object_to_string</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="libvips-VipsObject.html#vips-object-map" title="vips_object_map ()">vips_object_map</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsObject.html#VipsTypeMapFn" title="VipsTypeMapFn ()">*VipsTypeMapFn</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsObject.html#VipsTypeMap2Fn" title="VipsTypeMap2Fn ()">*VipsTypeMap2Fn</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsObject.html#VipsClassMapFn" title="VipsClassMapFn ()">*VipsClassMapFn</a><span class="c_punctuation">)</span> <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="libvips-VipsObject.html#vips-type-map" title="vips_type_map ()">vips_type_map</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="libvips-VipsObject.html#vips-type-map-all" title="vips_type_map_all ()">vips_type_map_all</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-type-depth" title="vips_type_depth ()">vips_type_depth</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GType</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-type-find" title="vips_type_find ()">vips_type_find</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-nickname-find" title="vips_nickname_find ()">vips_nickname_find</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="libvips-VipsObject.html#vips-class-map-all" title="vips_class_map_all ()">vips_class_map_all</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsObjectClass</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-class-find" title="vips_class_find ()">vips_class_find</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsObject</span> **
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-local-array" title="vips_object_local_array ()">vips_object_local_array</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="libvips-VipsObject.html#vips-object-local-cb" title="vips_object_local_cb ()">vips_object_local_cb</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-local" title="vips_object_local()">vips_object_local</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="libvips-VipsObject.html#vips-object-set-static" title="vips_object_set_static ()">vips_object_set_static</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="libvips-VipsObject.html#vips-object-print-all" title="vips_object_print_all ()">vips_object_print_all</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="libvips-VipsObject.html#vips-object-sanity-all" title="vips_object_sanity_all ()">vips_object_sanity_all</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="libvips-VipsObject.html#vips-object-rewind" title="vips_object_rewind ()">vips_object_rewind</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="libvips-VipsObject.html#vips-object-unref-outputs" title="vips_object_unref_outputs ()">vips_object_unref_outputs</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsObject.html#vips-object-get-description" title="vips_object_get_description ()">vips_object_get_description</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libvips-VipsObject.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VipsArgumentFlags" title="enum VipsArgumentFlags">VipsArgumentFlags</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VIPS-ARGUMENT-REQUIRED-INPUT:CAPS" title="VIPS_ARGUMENT_REQUIRED_INPUT">VIPS_ARGUMENT_REQUIRED_INPUT</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VIPS-ARGUMENT-OPTIONAL-INPUT:CAPS" title="VIPS_ARGUMENT_OPTIONAL_INPUT">VIPS_ARGUMENT_OPTIONAL_INPUT</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VIPS-ARGUMENT-REQUIRED-OUTPUT:CAPS" title="VIPS_ARGUMENT_REQUIRED_OUTPUT">VIPS_ARGUMENT_REQUIRED_OUTPUT</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VIPS-ARGUMENT-OPTIONAL-OUTPUT:CAPS" title="VIPS_ARGUMENT_OPTIONAL_OUTPUT">VIPS_ARGUMENT_OPTIONAL_OUTPUT</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VipsArgument" title="VipsArgument">VipsArgument</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VipsArgumentClass" title="VipsArgumentClass">VipsArgumentClass</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VipsArgumentInstance" title="VipsArgumentInstance">VipsArgumentInstance</a></td>
</tr>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VipsArgumentTable" title="VipsArgumentTable">VipsArgumentTable</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libvips-VipsObject.html#VIPS-ARGUMENT-COLLECT-END:CAPS" title="VIPS_ARGUMENT_COLLECT_END">VIPS_ARGUMENT_COLLECT_END</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libvips-VipsObject.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <vips/vips.h>
</pre>
</div>
<div class="refsect1">
<a name="libvips-VipsObject.description"></a><h2>Description</h2>
<p>The <span class="type">VipsObject</span> class and associated types and macros.</p>
<p><span class="type">VipsObject</span> is the base class for all objects in libvips. It has the
following major features:</p>
<p><span class="emphasis"><em>Functional class creation</em></span> Vips objects have a very
regular lifecycle: initialise, build, use, destroy. They behave rather like
function calls and are free of side-effects. </p>
<p><span class="emphasis"><em>Run-time introspection</em></span> Vips objects can be fully
introspected at run-time. There is not need for separate source-code
analysis. </p>
<p><span class="emphasis"><em>Command-line interface</em></span> Any vips object can be run from
the command-line with the <code class="literal">vips</code> driver program. </p>
<div class="refsect3">
<a name="id-1.3.12.7.7"></a><h4>The <span class="type">VipsObject</span> lifecycle</h4>
<p><span class="type">VipsObject</span> s have a strictly defined lifecycle, split broadly as construct
and then use. In detail, the stages are:</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p>g_object_new(). The <span class="type">VipsObject</span> is created with <code class="function">g_object_new()</code>. Objects
in this state are blank slates and need to have their various parameters
set.</p></li>
<li class="listitem"><p>g_object_set(). You loop over the <a class="link" href="libvips-VipsObject.html#VipsArgument" title="VipsArgument"><span class="type">VipsArgument</span></a> that the object has
defined with <a class="link" href="libvips-VipsObject.html#vips-argument-map" title="vips_argument_map ()"><code class="function">vips_argument_map()</code></a>. Arguments have a set of flags attached to
them for required, optional, input, output, type, and so on. You must set
all required arguments. </p></li>
<li class="listitem"><p>vips_object_build(). Call this to construct the object and get it ready
for use. Building an object happens in four stages, see below.</p></li>
<li class="listitem"><p>g_object_get(). The object has now been built. You can read out any
computed values. </p></li>
<li class="listitem"><p>g_object_unref(). When you are done with an object, you can unref it.
See the section on reference counting for an explanation of the convention
that <span class="type">VipsObject</span> uses. When the last ref to an object is released, the
object is closed. Objects close in three stages, see below.</p></li>
</ol></div>
<p>The stages inside <a class="link" href="libvips-VipsObject.html#vips-object-build" title="vips_object_build ()"><code class="function">vips_object_build()</code></a> are:</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p>Chain up through the object's <em class="parameter"><code>build</code></em>
class methods. At each stage,
each class does any initial setup and checking, then chains up to its
superclass.</p></li>
<li class="listitem"><p>The innermost <em class="parameter"><code>build</code></em>
method inside <span class="type">VipsObject</span> itself checks that all
input arguments have been set and then returns. </p></li>
<li class="listitem"><p>All object <em class="parameter"><code>build</code></em>
methods now finish executing, from innermost to
outermost. They know all input arguments have been checked and supplied, so
now they set all output arguments. </p></li>
<li class="listitem"><p>vips_object_build() finishes the process by checking that all output
objects have been set, and then triggering the <span class="type">“postbuild”</span>
signal. <span class="type">“postbuild”</span> only runs if the object has constructed
successfuly.</p></li>
</ol></div>
<p><span class="type">VipsOperation</span> has a cache of recent operation objects, see that class for
an explanation of <a class="link" href="libvips-VipsOperation.html#vips-cache-operation-build" title="vips_cache_operation_build ()"><code class="function">vips_cache_operation_build()</code></a>. </p>
<p>Finally the stages inside close are:</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p><span class="type">“preclose”</span>. This is emitted at the start of
the <span class="type">VipsObject</span> dispose. The object is still functioning. </p></li>
<li class="listitem"><p><span class="type">“close”</span>. This runs just after all <a class="link" href="libvips-VipsObject.html#VipsArgument" title="VipsArgument"><span class="type">VipsArgument</span></a> held by
the object have been released.</p></li>
<li class="listitem"><p><span class="type">“postclose”</span>. This runs right at the end. The object
pointer is still valid, but nothing else is. </p></li>
</ol></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.7.8"></a><h4><a class="link" href="libvips-VipsObject.html#VipsArgument" title="VipsArgument"><span class="type">VipsArgument</span></a></h4>
<p>libvips has a simple mechanism for automating at least some aspects of
<code class="literal">GObject</code> properties. You add a set of macros to your <code class="function">_class_init()</code> which
describe the arguments, and set the get and set functions to the vips ones.</p>
<p>See <a class="link" href="extending.html" title="Extending VIPS">extending</a> for a complete example. </p>
</div>
<div class="refsect3">
<a name="id-1.3.12.7.9"></a><h4>The <span class="type">VipsObject</span> reference counting convention</h4>
<p><span class="type">VipsObject</span> has a set of conventions to simplify reference counting.</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p>All input <code class="literal">GObject</code> have a ref added to them, owned by the object. When a
<span class="type">VipsObject</span> is unreffed, all of these refs to input objects are
automatically dropped.</p></li>
<li class="listitem"><p>All output <code class="literal">GObject</code> hold a ref to the object. When a <code class="literal">GObject</code> which is an
output of a <span class="type">VipsObject</span> is disposed, it must drop this reference.
<span class="type">VipsObject</span> which are outputs of other <span class="type">VipsObject</span> will do this
automatically. </p></li>
</ol></div>
<p>See <span class="type">VipsOperation</span> for an example of <span class="type">VipsObject</span> reference counting.</p>
</div>
</div>
<div class="refsect1">
<a name="libvips-VipsObject.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="VIPS-UNREF:CAPS"></a><h3>VIPS_UNREF()</h3>
<pre class="programlisting">#define VIPS_UNREF( X )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-IMAGE:CAPS"></a><h3>VIPS_ARG_IMAGE()</h3>
<pre class="programlisting">#define VIPS_ARG_IMAGE( CLASS, NAME, PRIORITY, LONG, DESC, FLAGS, OFFSET )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-INTERPOLATE:CAPS"></a><h3>VIPS_ARG_INTERPOLATE()</h3>
<pre class="programlisting">#define VIPS_ARG_INTERPOLATE( CLASS, NAME, PRIORITY, LONG, DESC, FLAGS, OFFSET )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-BOOL:CAPS"></a><h3>VIPS_ARG_BOOL()</h3>
<pre class="programlisting">#define VIPS_ARG_BOOL( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, VALUE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-DOUBLE:CAPS"></a><h3>VIPS_ARG_DOUBLE()</h3>
<pre class="programlisting">#define VIPS_ARG_DOUBLE( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, MIN, MAX, VALUE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-BOXED:CAPS"></a><h3>VIPS_ARG_BOXED()</h3>
<pre class="programlisting">#define VIPS_ARG_BOXED( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, TYPE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-INT:CAPS"></a><h3>VIPS_ARG_INT()</h3>
<pre class="programlisting">#define VIPS_ARG_INT( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, MIN, MAX, VALUE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-UINT64:CAPS"></a><h3>VIPS_ARG_UINT64()</h3>
<pre class="programlisting">#define VIPS_ARG_UINT64( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, MIN, MAX, VALUE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-ENUM:CAPS"></a><h3>VIPS_ARG_ENUM()</h3>
<pre class="programlisting">#define VIPS_ARG_ENUM( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, TYPE, VALUE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-FLAGS:CAPS"></a><h3>VIPS_ARG_FLAGS()</h3>
<pre class="programlisting">#define VIPS_ARG_FLAGS( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, TYPE, VALUE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-STRING:CAPS"></a><h3>VIPS_ARG_STRING()</h3>
<pre class="programlisting">#define VIPS_ARG_STRING( CLASS, NAME, PRIORITY, LONG, DESC, FLAGS, OFFSET, \
VALUE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARG-POINTER:CAPS"></a><h3>VIPS_ARG_POINTER()</h3>
<pre class="programlisting">#define VIPS_ARG_POINTER( CLASS, NAME, PRIORITY, LONG, DESC, FLAGS, OFFSET )</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips--argument-get-instance"></a><h3>vips__argument_get_instance ()</h3>
<pre class="programlisting"><a class="link" href="libvips-VipsObject.html#VipsArgumentInstance" title="VipsArgumentInstance"><span class="returnvalue">VipsArgumentInstance</span></a> *
vips__argument_get_instance (<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentClass" title="VipsArgumentClass"><span class="type">VipsArgumentClass</span></a> *argument_class</code></em>,
<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
<p>Convenience ... given the VipsArgumentClass, get the VipsArgumentInstance.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
</div>
<hr>
<div class="refsect2">
<a name="vips--argument-table-lookup"></a><h3>vips__argument_table_lookup ()</h3>
<pre class="programlisting"><a class="link" href="libvips-VipsObject.html#VipsArgument" title="VipsArgument"><span class="returnvalue">VipsArgument</span></a> *
vips__argument_table_lookup (<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentTable" title="VipsArgumentTable"><span class="type">VipsArgumentTable</span></a> *argument_class</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> *pspec</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips--object-set-member"></a><h3>vips__object_set_member ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips__object_set_member (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> *pspec</code></em>,
<em class="parameter"><code><span class="type">GObject</span> **member</code></em>,
<em class="parameter"><code><span class="type">GObject</span> *argument</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsArgumentMapFn"></a><h3>VipsArgumentMapFn ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
<span class="c_punctuation">(</span>*VipsArgumentMapFn<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> *pspec</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentClass" title="VipsArgumentClass"><span class="type">VipsArgumentClass</span></a> *argument_class</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentInstance" title="VipsArgumentInstance"><span class="type">VipsArgumentInstance</span></a> *argument_instance</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-argument-map"></a><h3>vips_argument_map ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_argument_map (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentMapFn" title="VipsArgumentMapFn ()"><span class="type">VipsArgumentMapFn</span></a> fn</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Loop over the vips_arguments to an object. Stop when <em class="parameter"><code>fn</code></em>
returns non-<code class="literal">NULL</code>
and return that value.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.18.6"></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>object</p></td>
<td class="parameter_description"><p>object whose args should be enumerated</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>fn</p></td>
<td class="parameter_description"><p>call this function for every argument</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.18.7"></a><h4>Returns</h4>
<p> <code class="literal">NULL</code> if <em class="parameter"><code>fn</code></em>
returns <code class="literal">NULL</code> for all arguments, otherwise the first
non-<code class="literal">NULL</code> value from <em class="parameter"><code>fn</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsArgumentClassMapFn"></a><h3>VipsArgumentClassMapFn ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
<span class="c_punctuation">(</span>*VipsArgumentClassMapFn<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">VipsObjectClass</span> *object_class</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> *pspec</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentClass" title="VipsArgumentClass"><span class="type">VipsArgumentClass</span></a> *argument_class</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-argument-class-map"></a><h3>vips_argument_class_map ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_argument_class_map (<em class="parameter"><code><span class="type">VipsObjectClass</span> *object_class</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentClassMapFn" title="VipsArgumentClassMapFn ()"><span class="type">VipsArgumentClassMapFn</span></a> fn</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>And loop over a class. Same as ^^, but with no VipsArgumentInstance.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
</div>
<hr>
<div class="refsect2">
<a name="vips-argument-class-needsstring"></a><h3>vips_argument_class_needsstring ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_argument_class_needsstring (<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentClass" title="VipsArgumentClass"><span class="type">VipsArgumentClass</span></a> *argument_class</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-get-argument"></a><h3>vips_object_get_argument ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_get_argument (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> **pspec</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentClass" title="VipsArgumentClass"><span class="type">VipsArgumentClass</span></a> **argument_class</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentInstance" title="VipsArgumentInstance"><span class="type">VipsArgumentInstance</span></a> **argument_instance</code></em>);</pre>
<p>Look up the three things you need to work with a vips argument.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.22.6"></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>object</p></td>
<td class="parameter_description"><p>the object to fetch the args from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>arg to fetch</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pspec</p></td>
<td class="parameter_description"><p> the pspec for this arg. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>argument_class</p></td>
<td class="parameter_description"><p> the argument_class for this arg. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>argument_instance</p></td>
<td class="parameter_description"><p> the argument_instance for this arg. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.22.7"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-argument-isset"></a><h3>vips_object_argument_isset ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_object_argument_isset (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
<p>Convenience: has an argument been assigned. Useful for bindings.</p>
<div class="refsect3">
<a name="id-1.3.12.8.23.5"></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>object</p></td>
<td class="parameter_description"><p>the object to fetch the args from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>arg to fetch</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.23.6"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the argument has been assigned.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-get-argument-flags"></a><h3>vips_object_get_argument_flags ()</h3>
<pre class="programlisting"><a class="link" href="libvips-VipsObject.html#VipsArgumentFlags" title="enum VipsArgumentFlags"><span class="returnvalue">VipsArgumentFlags</span></a>
vips_object_get_argument_flags (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
<p>Convenience: get the flags for an argument. Useful for bindings.</p>
<div class="refsect3">
<a name="id-1.3.12.8.24.5"></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>object</p></td>
<td class="parameter_description"><p>the object to fetch the args from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>arg to fetch</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.24.6"></a><h4>Returns</h4>
<p> The <a class="link" href="libvips-VipsObject.html#VipsArgumentFlags" title="enum VipsArgumentFlags"><span class="type">VipsArgumentFlags</span></a> for this argument.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-get-argument-priority"></a><h3>vips_object_get_argument_priority ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_get_argument_priority (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
<p>Convenience: get the priority for an argument. Useful for bindings.</p>
<div class="refsect3">
<a name="id-1.3.12.8.25.5"></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>object</p></td>
<td class="parameter_description"><p>the object to fetch the args from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>arg to fetch</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.25.6"></a><h4>Returns</h4>
<p> The priority of this argument.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARGUMENT-FOR-ALL:CAPS"></a><h3>VIPS_ARGUMENT_FOR_ALL()</h3>
<pre class="programlisting">#define VIPS_ARGUMENT_FOR_ALL( OBJECT, PSPEC, ARG_CLASS, ARG_INSTANCE )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARGUMENT-COLLECT-SET:CAPS"></a><h3>VIPS_ARGUMENT_COLLECT_SET()</h3>
<pre class="programlisting">#define VIPS_ARGUMENT_COLLECT_SET( PSPEC, ARG_CLASS, AP )</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARGUMENT-COLLECT-GET:CAPS"></a><h3>VIPS_ARGUMENT_COLLECT_GET()</h3>
<pre class="programlisting">#define VIPS_ARGUMENT_COLLECT_GET( PSPEC, ARG_CLASS, AP )</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-value-is-null"></a><h3>vips_value_is_null ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_value_is_null (<em class="parameter"><code><span class="type">GParamSpec</span> *psoec</code></em>,
<em class="parameter"><code>const <span class="type">GValue</span> *value</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-set-property"></a><h3>vips_object_set_property ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_set_property (<em class="parameter"><code><span class="type">GObject</span> *gobject</code></em>,
<em class="parameter"><code><span class="type">guint</span> property_id</code></em>,
<em class="parameter"><code>const <span class="type">GValue</span> *value</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> *pspec</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-get-property"></a><h3>vips_object_get_property ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_get_property (<em class="parameter"><code><span class="type">GObject</span> *gobject</code></em>,
<em class="parameter"><code><span class="type">guint</span> property_id</code></em>,
<em class="parameter"><code><span class="type">GValue</span> *value</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> *pspec</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-preclose"></a><h3>vips_object_preclose ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_preclose (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-build"></a><h3>vips_object_build ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_build (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-summary-class"></a><h3>vips_object_summary_class ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_summary_class (<em class="parameter"><code><span class="type">VipsObjectClass</span> *klass</code></em>,
<em class="parameter"><code><a class="link" href="libvips-buf.html#VipsBuf" title="VipsBuf"><span class="type">VipsBuf</span></a> *buf</code></em>);</pre>
<p>Generate a human-readable summary for a class.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.34.6"></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>klass</p></td>
<td class="parameter_description"><p>class to summarise</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>write summary here</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-summary"></a><h3>vips_object_summary ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_summary (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><a class="link" href="libvips-buf.html#VipsBuf" title="VipsBuf"><span class="type">VipsBuf</span></a> *buf</code></em>);</pre>
<p>Generate a human-readable summary for an object.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.35.6"></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>object</p></td>
<td class="parameter_description"><p>object to summarise</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>write summary here</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-dump"></a><h3>vips_object_dump ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_dump (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><a class="link" href="libvips-buf.html#VipsBuf" title="VipsBuf"><span class="type">VipsBuf</span></a> *buf</code></em>);</pre>
<p>Dump everything that vips knows about an object to a string.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.36.6"></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>object</p></td>
<td class="parameter_description"><p>object to dump</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>write dump here</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-print-summary-class"></a><h3>vips_object_print_summary_class ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_print_summary_class (<em class="parameter"><code><span class="type">VipsObjectClass</span> *klass</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-print-summary"></a><h3>vips_object_print_summary ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_print_summary (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-print-dump"></a><h3>vips_object_print_dump ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_print_dump (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-print-name"></a><h3>vips_object_print_name ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_print_name (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-sanity"></a><h3>vips_object_sanity ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_object_sanity (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-class-install-argument"></a><h3>vips_object_class_install_argument ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_class_install_argument (<em class="parameter"><code><span class="type">VipsObjectClass</span> *cls</code></em>,
<em class="parameter"><code><span class="type">GParamSpec</span> *pspec</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsArgumentFlags" title="enum VipsArgumentFlags"><span class="type">VipsArgumentFlags</span></a> flags</code></em>,
<em class="parameter"><code><span class="type">int</span> priority</code></em>,
<em class="parameter"><code><span class="type">guint</span> offset</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-set-argument-from-string"></a><h3>vips_object_set_argument_from_string ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_set_argument_from_string (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-argument-needsstring"></a><h3>vips_object_argument_needsstring ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_object_argument_needsstring (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-get-argument-to-string"></a><h3>vips_object_get_argument_to_string ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_get_argument_to_string (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *arg</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-set-required"></a><h3>vips_object_set_required ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_set_required (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsObjectSetArguments"></a><h3>VipsObjectSetArguments ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
<span class="c_punctuation">(</span>*VipsObjectSetArguments<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-new"></a><h3>vips_object_new ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsObject</span> *
vips_object_new (<em class="parameter"><code><span class="type">GType</span> type</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsObjectSetArguments" title="VipsObjectSetArguments ()"><span class="type">VipsObjectSetArguments</span></a> set</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>g_object_new() the object, set any arguments with <em class="parameter"><code>set</code></em>
, call
<a class="link" href="libvips-VipsObject.html#vips-object-build" title="vips_object_build ()"><code class="function">vips_object_build()</code></a> and return the complete object.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.48.6"></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>type</p></td>
<td class="parameter_description"><p>object to create</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>set</p></td>
<td class="parameter_description"><p>set arguments with this</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.48.7"></a><h4>Returns</h4>
<p> the new object</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-set-valist"></a><h3>vips_object_set_valist ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_set_valist (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><span class="type">va_list</span> ap</code></em>);</pre>
<p>See <a class="link" href="libvips-VipsObject.html#vips-object-set" title="vips_object_set ()"><code class="function">vips_object_set()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.12.8.49.5"></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>object</p></td>
<td class="parameter_description"><p>object to set arguments on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ap</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of argument/value pairs</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.49.6"></a><h4>Returns</h4>
<p> 0 on success, -1 on error</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-set"></a><h3>vips_object_set ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_set (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Set a list of vips object arguments. For example:</p>
<div class="informalexample"><pre class="programlisting">
vips_object_set (operation,
"input", in,
"output", &out,
NULL);
</pre></div>
<p></p>
<p>Input arguments are given in-line, output arguments are given as pointers
to where the output value should be written.</p>
<p>See also: <a class="link" href="libvips-VipsObject.html#vips-object-set-valist" title="vips_object_set_valist ()"><code class="function">vips_object_set_valist()</code></a>, <a class="link" href="libvips-VipsObject.html#vips-object-set-from-string" title="vips_object_set_from_string ()"><code class="function">vips_object_set_from_string()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.12.8.50.9"></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>object</p></td>
<td class="parameter_description"><p>object to set arguments on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of argument/value pairs</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.50.10"></a><h4>Returns</h4>
<p> 0 on success, -1 on error</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-set-from-string"></a><h3>vips_object_set_from_string ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_object_set_from_string (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *string</code></em>);</pre>
<p>Set object arguments from a string. The string can be something like
"a=12", or "a = 12, b = 13", or "fred". The string can optionally be
enclosed in brackets. </p>
<p>You'd typically use this between creating the object and building it. </p>
<p>See also: <a class="link" href="libvips-VipsObject.html#vips-object-set" title="vips_object_set ()"><code class="function">vips_object_set()</code></a>, <a class="link" href="libvips-VipsObject.html#vips-object-build" title="vips_object_build ()"><code class="function">vips_object_build()</code></a>,
<a class="link" href="libvips-VipsOperation.html#vips-cache-operation-buildp" title="vips_cache_operation_buildp ()"><code class="function">vips_cache_operation_buildp()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.12.8.51.7"></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>object</p></td>
<td class="parameter_description"><p>object to set arguments on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>string</p></td>
<td class="parameter_description"><p>arguments as a string</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.51.8"></a><h4>Returns</h4>
<p> 0 on success, -1 on error</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-new-from-string"></a><h3>vips_object_new_from_string ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsObject</span> *
vips_object_new_from_string (<em class="parameter"><code><span class="type">VipsObjectClass</span> *object_class</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *p</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-to-string"></a><h3>vips_object_to_string ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_to_string (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><a class="link" href="libvips-buf.html#VipsBuf" title="VipsBuf"><span class="type">VipsBuf</span></a> *buf</code></em>);</pre>
<p>The inverse of <a class="link" href="libvips-VipsObject.html#vips-object-new-from-string" title="vips_object_new_from_string ()"><code class="function">vips_object_new_from_string()</code></a>: turn <em class="parameter"><code>object</code></em>
into eg.
"VipsInterpolateSnohalo1(blur=.333333)".</p>
<div class="refsect3">
<a name="id-1.3.12.8.53.5"></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>object</p></td>
<td class="parameter_description"><p>object to stringify</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>write string here</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-map"></a><h3>vips_object_map ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_object_map (<em class="parameter"><code><a class="link" href="libvips-basic.html#VipsSListMap2Fn" title="VipsSListMap2Fn ()"><span class="type">VipsSListMap2Fn</span></a> fn</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Call a function for all alive objects.
Stop when <em class="parameter"><code>fn</code></em>
returns non-<code class="literal">NULL</code> and return that value.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.54.6"></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>fn</p></td>
<td class="parameter_description"><p>function to call for all objects</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.54.7"></a><h4>Returns</h4>
<p> <code class="literal">NULL</code> if <em class="parameter"><code>fn</code></em>
returns <code class="literal">NULL</code> for all arguments, otherwise the first
non-<code class="literal">NULL</code> value from <em class="parameter"><code>fn</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsTypeMapFn"></a><h3>VipsTypeMapFn ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
<span class="c_punctuation">(</span>*VipsTypeMapFn<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">GType</span> type</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsTypeMap2Fn"></a><h3>VipsTypeMap2Fn ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
<span class="c_punctuation">(</span>*VipsTypeMap2Fn<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">GType</span> type</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsClassMapFn"></a><h3>VipsClassMapFn ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
<span class="c_punctuation">(</span>*VipsClassMapFn<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">VipsObjectClass</span> *cls</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-type-map"></a><h3>vips_type_map ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_type_map (<em class="parameter"><code><span class="type">GType</span> base</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsTypeMap2Fn" title="VipsTypeMap2Fn ()"><span class="type">VipsTypeMap2Fn</span></a> fn</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Map over a type's children. Stop when <em class="parameter"><code>fn</code></em>
returns non-<code class="literal">NULL</code>
and return that value.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.58.6"></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>base</p></td>
<td class="parameter_description"><p>base type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>fn</p></td>
<td class="parameter_description"><p>call this function for every type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.58.7"></a><h4>Returns</h4>
<p> <code class="literal">NULL</code> if <em class="parameter"><code>fn</code></em>
returns <code class="literal">NULL</code> for all arguments, otherwise the first
non-<code class="literal">NULL</code> value from <em class="parameter"><code>fn</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-type-map-all"></a><h3>vips_type_map_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_type_map_all (<em class="parameter"><code><span class="type">GType</span> base</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsTypeMapFn" title="VipsTypeMapFn ()"><span class="type">VipsTypeMapFn</span></a> fn</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>);</pre>
<p>Map over a type's children, direct and indirect. Stop when <em class="parameter"><code>fn</code></em>
returns
non-<code class="literal">NULL</code> and return that value.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.59.6"></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>base</p></td>
<td class="parameter_description"><p>base type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>fn</p></td>
<td class="parameter_description"><p>call this function for every type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.59.7"></a><h4>Returns</h4>
<p> <code class="literal">NULL</code> if <em class="parameter"><code>fn</code></em>
returns <code class="literal">NULL</code> for all arguments, otherwise the first
non-<code class="literal">NULL</code> value from <em class="parameter"><code>fn</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-type-depth"></a><h3>vips_type_depth ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_type_depth (<em class="parameter"><code><span class="type">GType</span> type</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-type-find"></a><h3>vips_type_find ()</h3>
<pre class="programlisting"><span class="returnvalue">GType</span>
vips_type_find (<em class="parameter"><code>const <span class="type">char</span> *basename</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *nickname</code></em>);</pre>
<p>Search below <em class="parameter"><code>basename</code></em>
, return the <code class="literal">GType</code> of the class whose name or
<em class="parameter"><code>nickname</code></em>
matches, or 0 for not found.
If <em class="parameter"><code>basename</code></em>
is NULL, the whole of <span class="type">VipsObject</span> is searched.</p>
<p>This function uses a cache, so it should be quick. </p>
<p>See also: <a class="link" href="libvips-VipsObject.html#vips-class-find" title="vips_class_find ()"><code class="function">vips_class_find()</code></a></p>
<div class="refsect3">
<a name="id-1.3.12.8.61.7"></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>basename</p></td>
<td class="parameter_description"><p>name of base class</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nickname</p></td>
<td class="parameter_description"><p>search for a class with this nickname</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.61.8"></a><h4>Returns</h4>
<p> the <code class="literal">GType</code> of the class, or 0 if the class is not found.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-nickname-find"></a><h3>vips_nickname_find ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *
vips_nickname_find (<em class="parameter"><code><span class="type">GType</span> type</code></em>);</pre>
<p>Return the VIPS nickname for a <code class="literal">GType</code>. Handy for language bindings.</p>
<div class="refsect3">
<a name="id-1.3.12.8.62.5"></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>type</p></td>
<td class="parameter_description"><p><span class="type">GType</span> to search for</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.62.6"></a><h4>Returns</h4>
<p> the class nickname. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-class-map-all"></a><h3>vips_class_map_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_class_map_all (<em class="parameter"><code><span class="type">GType</span> type</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsObject.html#VipsClassMapFn" title="VipsClassMapFn ()"><span class="type">VipsClassMapFn</span></a> fn</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>);</pre>
<p>Loop over all the subclasses of <em class="parameter"><code>type</code></em>
. Non-abstract classes only.
Stop when <em class="parameter"><code>fn</code></em>
returns
non-<code class="literal">NULL</code> and return that value.</p>
<div class="refsect3">
<a name="id-1.3.12.8.63.5"></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>type</p></td>
<td class="parameter_description"><p>base type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>fn</p></td>
<td class="parameter_description"><p>call this function for every type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.63.6"></a><h4>Returns</h4>
<p> <code class="literal">NULL</code> if <em class="parameter"><code>fn</code></em>
returns <code class="literal">NULL</code> for all arguments, otherwise the first
non-<code class="literal">NULL</code> value from <em class="parameter"><code>fn</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-class-find"></a><h3>vips_class_find ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsObjectClass</span> *
vips_class_find (<em class="parameter"><code>const <span class="type">char</span> *basename</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *nickname</code></em>);</pre>
<p>Search below <em class="parameter"><code>basename</code></em>
, return the first class whose name or <em class="parameter"><code>nickname</code></em>
matches.</p>
<p>See also: <a class="link" href="libvips-VipsObject.html#vips-type-find" title="vips_type_find ()"><code class="function">vips_type_find()</code></a></p>
<div class="refsect3">
<a name="id-1.3.12.8.64.6"></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>basename</p></td>
<td class="parameter_description"><p>name of base class</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nickname</p></td>
<td class="parameter_description"><p>search for a class with this nickname</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.64.7"></a><h4>Returns</h4>
<p> the found class.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-local-array"></a><h3>vips_object_local_array ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsObject</span> **
vips_object_local_array (<em class="parameter"><code><span class="type">VipsObject</span> *parent</code></em>,
<em class="parameter"><code><span class="type">int</span> n</code></em>);</pre>
<p>Make an array of NULL VipsObject pointers. When <em class="parameter"><code>parent</code></em>
closes, every
non-NULL pointer in the array will be unreffed and the array will be
freed. Handy for creating a set of temporary images for a function.</p>
<p>The array is NULL-terminated, ie. contains an extra NULL element at the
end. </p>
<p>Example:</p>
<div class="informalexample"><pre class="programlisting">
VipsObject **t;
t = vips_object_local_array( a, 5 );
if(
vips_add( a, b, &t[0], NULL ) ||
vips_invert( t[0], &t[1], NULL ) ||
vips_add( t[1], t[0], &t[2], NULL ) ||
vips_costra( t[2], out, NULL ) )
return( -1 );
</pre></div>
<p></p>
<p>See also: <a class="link" href="libvips-VipsObject.html#vips-object-local" title="vips_object_local()"><code class="function">vips_object_local()</code></a>.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.3.12.8.65.11"></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>parent</p></td>
<td class="parameter_description"><p>objects unref when this object unrefs</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n</p></td>
<td class="parameter_description"><p>array size</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.65.12"></a><h4>Returns</h4>
<p> an array of NULL pointers of length <em class="parameter"><code>n</code></em>
</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-local-cb"></a><h3>vips_object_local_cb ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_local_cb (<em class="parameter"><code><span class="type">VipsObject</span> *vobject</code></em>,
<em class="parameter"><code><span class="type">GObject</span> *gobject</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-local"></a><h3>vips_object_local()</h3>
<pre class="programlisting">#define vips_object_local( V, G )</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-set-static"></a><h3>vips_object_set_static ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_set_static (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> static_object</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-print-all"></a><h3>vips_object_print_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_print_all (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-sanity-all"></a><h3>vips_object_sanity_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_sanity_all (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-rewind"></a><h3>vips_object_rewind ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_rewind (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-unref-outputs"></a><h3>vips_object_unref_outputs ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_object_unref_outputs (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
<p>Unref all assigned output objects. Useful for language bindings. </p>
<p>After an object is built, all output args are owned by the caller. If
something goes wrong before then, we have to unref the outputs that have
been made so far. This function can also be useful for callers when
they've finished processing outputs themselves.</p>
<p>See also: <a class="link" href="libvips-VipsOperation.html#vips-cache-operation-build" title="vips_cache_operation_build ()"><code class="function">vips_cache_operation_build()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.12.8.72.7"></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>object</p></td>
<td class="parameter_description"><p>object to drop output refs from</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-object-get-description"></a><h3>vips_object_get_description ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *
vips_object_get_description (<em class="parameter"><code><span class="type">VipsObject</span> *object</code></em>);</pre>
<p>Fetch the object description. Useful for language bindings. </p>
<p><em class="parameter"><code>object.description</code></em>
is only avaliable after <code class="function">_build()</code>, which can be too
late. This function fetches from the instance, if possible, but falls back
to the class description if we are too early.</p>
<div class="refsect3">
<a name="id-1.3.12.8.73.6"></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>object</p></td>
<td class="parameter_description"><p>object to fetch description from</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.12.8.73.7"></a><h4>Returns</h4>
<p> the object description</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="libvips-VipsObject.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="VipsArgumentFlags"></a><h3>enum VipsArgumentFlags</h3>
<p>Flags we associate with each object argument.</p>
<p>Have separate input & output flags. Both set is an error; neither set is OK.</p>
<p>Input gobjects are automatically reffed, output gobjects automatically ref
us. We also automatically watch for "destroy" and unlink.</p>
<p><em class="parameter"><code>VIPS_ARGUMENT_SET_ALWAYS</code></em>
is handy for arguments which are set from C. For
example, VipsImage::width is a property that gives access to the Xsize
member of struct _VipsImage. We default its 'assigned' to TRUE
since the field is always set directly by C.</p>
<p><em class="parameter"><code>VIPS_ARGUMENT_DEPRECATED</code></em>
arguments are not shown in help text, are not
looked for if required, are not checked for "have-been-set". You can
deprecate a required argument, but you must obviously add a new required
argument if you do.</p>
<p>Input args with <em class="parameter"><code>VIPS_ARGUMENT_MODIFY</code></em>
will be modified by the operation.
This is used for things like the in-place drawing operations.</p>
<div class="refsect3">
<a name="id-1.3.12.9.2.9"></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="VIPS-ARGUMENT-NONE:CAPS"></a>VIPS_ARGUMENT_NONE</p></td>
<td class="enum_member_description">
<p>no flags</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ARGUMENT-REQUIRED:CAPS"></a>VIPS_ARGUMENT_REQUIRED</p></td>
<td class="enum_member_description">
<p>must be set in the constructor</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ARGUMENT-CONSTRUCT:CAPS"></a>VIPS_ARGUMENT_CONSTRUCT</p></td>
<td class="enum_member_description">
<p>can only be set in the constructor</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ARGUMENT-SET-ONCE:CAPS"></a>VIPS_ARGUMENT_SET_ONCE</p></td>
<td class="enum_member_description">
<p>can only be set once</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ARGUMENT-SET-ALWAYS:CAPS"></a>VIPS_ARGUMENT_SET_ALWAYS</p></td>
<td class="enum_member_description">
<p>don't do use-before-set checks</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ARGUMENT-INPUT:CAPS"></a>VIPS_ARGUMENT_INPUT</p></td>
<td class="enum_member_description">
<p>is an input argument (one we depend on)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ARGUMENT-OUTPUT:CAPS"></a>VIPS_ARGUMENT_OUTPUT</p></td>
<td class="enum_member_description">
<p>is an output argument (depends on us)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ARGUMENT-DEPRECATED:CAPS"></a>VIPS_ARGUMENT_DEPRECATED</p></td>
<td class="enum_member_description">
<p>just there for back-compat, hide </p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ARGUMENT-MODIFY:CAPS"></a>VIPS_ARGUMENT_MODIFY</p></td>
<td class="enum_member_description">
<p>the input argument will be modified</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARGUMENT-REQUIRED-INPUT:CAPS"></a><h3>VIPS_ARGUMENT_REQUIRED_INPUT</h3>
<pre class="programlisting">#define VIPS_ARGUMENT_REQUIRED_INPUT</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARGUMENT-OPTIONAL-INPUT:CAPS"></a><h3>VIPS_ARGUMENT_OPTIONAL_INPUT</h3>
<pre class="programlisting">#define VIPS_ARGUMENT_OPTIONAL_INPUT</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARGUMENT-REQUIRED-OUTPUT:CAPS"></a><h3>VIPS_ARGUMENT_REQUIRED_OUTPUT</h3>
<pre class="programlisting">#define VIPS_ARGUMENT_REQUIRED_OUTPUT</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARGUMENT-OPTIONAL-OUTPUT:CAPS"></a><h3>VIPS_ARGUMENT_OPTIONAL_OUTPUT</h3>
<pre class="programlisting">#define VIPS_ARGUMENT_OPTIONAL_OUTPUT</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsArgument"></a><h3>VipsArgument</h3>
<pre class="programlisting">typedef struct {
GParamSpec *pspec; /* pspec for this argument */
/* More stuff, see below */
} VipsArgument;
</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsArgumentClass"></a><h3>VipsArgumentClass</h3>
<pre class="programlisting">typedef struct {
VipsArgument parent;
/* The class of the object we are an arg for.
*/
VipsObjectClass *object_class;
VipsArgumentFlags flags;
int priority; /* Order args by this */
guint offset; /* G_STRUCT_OFFSET of member in object */
} VipsArgumentClass;
</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsArgumentInstance"></a><h3>VipsArgumentInstance</h3>
<pre class="programlisting">typedef struct {
VipsArgument parent;
/* The class we are part of.
*/
VipsArgumentClass *argument_class;
/* The object we are attached to.
*/
VipsObject *object;
/* Has been set.
*/
gboolean assigned;
/* If this is an output argument, keep the id of our "close" handler
* here.
*/
gulong close_id;
/* We need to listen for "invalidate" on input images and send our own
* "invalidate" out. If we go, we need to disconnect.
*/
gulong invalidate_id;
} VipsArgumentInstance;
</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsArgumentTable"></a><h3>VipsArgumentTable</h3>
<pre class="programlisting">typedef GHashTable VipsArgumentTable;
</pre>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-ARGUMENT-COLLECT-END:CAPS"></a><h3>VIPS_ARGUMENT_COLLECT_END</h3>
<pre class="programlisting">#define VIPS_ARGUMENT_COLLECT_END</pre>
</div>
</div>
<div class="refsect1">
<a name="libvips-VipsObject.see-also"></a><h2>See Also</h2>
operation
</div>
</div>
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