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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>VIPS Reference Manual: VipsInterpolate</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> 
                  <a href="#VipsInterpolate.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
                  <a href="#VipsInterpolate.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<div class="refentry">
<a name="VipsInterpolate"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="VipsInterpolate.top_of_page"></a>VipsInterpolate</span></h2>
<p>VipsInterpolate — various interpolators: nearest, bilinear, and
some non-linear</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="VipsInterpolate.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
</div>
<div class="refsect1">
<a name="VipsInterpolate.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="VipsInterpolate.html#VipsInterpolateMethod" title="VipsInterpolateMethod ()">*VipsInterpolateMethod</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="VipsInterpolate.html#vips-interpolate" title="vips_interpolate ()">vips_interpolate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="VipsInterpolate.html#VipsInterpolateMethod" title="VipsInterpolateMethod ()"><span class="returnvalue">VipsInterpolateMethod</span></a>
</td>
<td class="function_name">
<a class="link" href="VipsInterpolate.html#vips-interpolate-get-method" title="vips_interpolate_get_method ()">vips_interpolate_get_method</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="VipsInterpolate.html#vips-interpolate-get-window-size" title="vips_interpolate_get_window_size ()">vips_interpolate_get_window_size</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="VipsInterpolate.html#vips-interpolate-get-window-offset" title="vips_interpolate_get_window_offset ()">vips_interpolate_get_window_offset</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="VipsInterpolate.html#VIPS-TRANSFORM-SHIFT:CAPS" title="VIPS_TRANSFORM_SHIFT">VIPS_TRANSFORM_SHIFT</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="VipsInterpolate.html#VIPS-TRANSFORM-SCALE:CAPS" title="VIPS_TRANSFORM_SCALE">VIPS_TRANSFORM_SCALE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="VipsInterpolate.html#VIPS-INTERPOLATE-SHIFT:CAPS" title="VIPS_INTERPOLATE_SHIFT">VIPS_INTERPOLATE_SHIFT</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="VipsInterpolate.html#VIPS-INTERPOLATE-SCALE:CAPS" title="VIPS_INTERPOLATE_SCALE">VIPS_INTERPOLATE_SCALE</a></td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> *
</td>
<td class="function_name">
<a class="link" href="VipsInterpolate.html#vips-interpolate-nearest-static" title="vips_interpolate_nearest_static ()">vips_interpolate_nearest_static</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> *
</td>
<td class="function_name">
<a class="link" href="VipsInterpolate.html#vips-interpolate-bilinear-static" title="vips_interpolate_bilinear_static ()">vips_interpolate_bilinear_static</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> *
</td>
<td class="function_name">
<a class="link" href="VipsInterpolate.html#vips-interpolate-new" title="vips_interpolate_new ()">vips_interpolate_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="VipsInterpolate.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
    <span class="lineart">╰──</span> <a class="link" href="VipsObject.html" title="VipsObject">VipsObject</a>
        <span class="lineart">╰──</span> VipsInterpolate
</pre>
</div>
<div class="refsect1">
<a name="VipsInterpolate.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;vips/vips.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="VipsInterpolate.description"></a><h2>Description</h2>
<p>A number of image interpolators.</p>
</div>
<div class="refsect1">
<a name="VipsInterpolate.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="VipsInterpolateMethod"></a><h3>VipsInterpolateMethod ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*VipsInterpolateMethod<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="type">VipsInterpolate</span></a> *interpolate</code></em>,
                          <em class="parameter"><code><span class="type">void</span> *out</code></em>,
                          <em class="parameter"><code><a class="link" href="VipsRegion.html" title="VipsRegion"><span class="type">VipsRegion</span></a> *in</code></em>,
                          <em class="parameter"><code><span class="type">double</span> x</code></em>,
                          <em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<p>An interpolation function. It should read source pixels from <em class="parameter"><code>in</code></em>
 with
<a class="link" href="VipsRegion.html#VIPS-REGION-ADDR:CAPS" title="VIPS_REGION_ADDR()"><code class="function">VIPS_REGION_ADDR()</code></a>, it can look left and up from (x, y) by <em class="parameter"><code>window_offset</code></em>

pixels and it can access pixels in a window of size <em class="parameter"><code>window_size</code></em>
.</p>
<p>The interpolated value should be written to the pixel pointed to by <em class="parameter"><code>out</code></em>
.</p>
<p>See also: <span class="type">VipsInterpolateClass</span>.</p>
<div class="refsect3">
<a name="id-1.4.10.8.2.7"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>interpolate</p></td>
<td class="parameter_description"><p>the interpolator</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>write the interpolated pixel here</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p>read source pixels from here</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>interpolate value at this position</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>interpolate value at this position</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-interpolate"></a><h3>vips_interpolate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_interpolate (<em class="parameter"><code><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="type">VipsInterpolate</span></a> *interpolate</code></em>,
                  <em class="parameter"><code><span class="type">void</span> *out</code></em>,
                  <em class="parameter"><code><a class="link" href="VipsRegion.html" title="VipsRegion"><span class="type">VipsRegion</span></a> *in</code></em>,
                  <em class="parameter"><code><span class="type">double</span> x</code></em>,
                  <em class="parameter"><code><span class="type">double</span> y</code></em>);</pre>
<p>Look up the <em class="parameter"><code>interpolate</code></em>
 method in the class and call it. Use
<a class="link" href="VipsInterpolate.html#vips-interpolate-get-method" title="vips_interpolate_get_method ()"><code class="function">vips_interpolate_get_method()</code></a> to get a direct pointer to the function and
avoid the lookup overhead.</p>
<p>You need to set <em class="parameter"><code>in</code></em>
 and <em class="parameter"><code>out</code></em>
 up correctly.</p>
<div class="refsect3">
<a name="id-1.4.10.8.3.6"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>interpolate</p></td>
<td class="parameter_description"><p>interpolator to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>write result here</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p>read source data from here</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>interpolate value at this position</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>interpolate value at this position</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-interpolate-get-method"></a><h3>vips_interpolate_get_method ()</h3>
<pre class="programlisting"><a class="link" href="VipsInterpolate.html#VipsInterpolateMethod" title="VipsInterpolateMethod ()"><span class="returnvalue">VipsInterpolateMethod</span></a>
vips_interpolate_get_method (<em class="parameter"><code><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="type">VipsInterpolate</span></a> *interpolate</code></em>);</pre>
<p>Look up the <em class="parameter"><code>interpolate</code></em>
 method in the class and return it. Use this
instead of <a class="link" href="VipsInterpolate.html#vips-interpolate" title="vips_interpolate ()"><code class="function">vips_interpolate()</code></a> to cache method dispatch.</p>
<div class="refsect3">
<a name="id-1.4.10.8.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>interpolate</p></td>
<td class="parameter_description"><p>interpolator to use</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.10.8.4.6"></a><h4>Returns</h4>
<p> a pointer to the interpolation function</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-interpolate-get-window-size"></a><h3>vips_interpolate_get_window_size ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_interpolate_get_window_size (<em class="parameter"><code><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="type">VipsInterpolate</span></a> *interpolate</code></em>);</pre>
<p>Look up an interpolators desired window size.</p>
<div class="refsect3">
<a name="id-1.4.10.8.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>interpolate</p></td>
<td class="parameter_description"><p>interpolator to use</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.10.8.5.6"></a><h4>Returns</h4>
<p> the interpolators required window size</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-interpolate-get-window-offset"></a><h3>vips_interpolate_get_window_offset ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_interpolate_get_window_offset (<em class="parameter"><code><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="type">VipsInterpolate</span></a> *interpolate</code></em>);</pre>
<p>Look up an interpolators desired window offset.</p>
<div class="refsect3">
<a name="id-1.4.10.8.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>interpolate</p></td>
<td class="parameter_description"><p>interpolator to use</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.10.8.6.6"></a><h4>Returns</h4>
<p> the interpolators required window offset</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-TRANSFORM-SHIFT:CAPS"></a><h3>VIPS_TRANSFORM_SHIFT</h3>
<pre class="programlisting">#define VIPS_TRANSFORM_SHIFT (6)
</pre>
<p>Many of the vips interpolators use fixed-point arithmetic for coordinate
calculation. This is how many bits of precision they use.</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-TRANSFORM-SCALE:CAPS"></a><h3>VIPS_TRANSFORM_SCALE</h3>
<pre class="programlisting">#define VIPS_TRANSFORM_SCALE (1 &lt;&lt; VIPS_TRANSFORM_SHIFT)
</pre>
<p><a class="link" href="VipsInterpolate.html#VIPS-TRANSFORM-SHIFT:CAPS" title="VIPS_TRANSFORM_SHIFT"><span class="type">VIPS_TRANSFORM_SHIFT</span></a> as a multiplicative constant.</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-INTERPOLATE-SHIFT:CAPS"></a><h3>VIPS_INTERPOLATE_SHIFT</h3>
<pre class="programlisting">#define VIPS_INTERPOLATE_SHIFT (12)
</pre>
<p>Many of the vips interpolators use fixed-point arithmetic for value
calcualtion. This is how many bits of precision they use.</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-INTERPOLATE-SCALE:CAPS"></a><h3>VIPS_INTERPOLATE_SCALE</h3>
<pre class="programlisting">#define VIPS_INTERPOLATE_SCALE (1 &lt;&lt; VIPS_INTERPOLATE_SHIFT)
</pre>
<p><a class="link" href="VipsInterpolate.html#VIPS-INTERPOLATE-SHIFT:CAPS" title="VIPS_INTERPOLATE_SHIFT"><span class="type">VIPS_INTERPOLATE_SHIFT</span></a> as a multiplicative constant.</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-interpolate-nearest-static"></a><h3>vips_interpolate_nearest_static ()</h3>
<pre class="programlisting"><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> *
vips_interpolate_nearest_static (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>A convenience function that returns a nearest-neighbour interpolator you 
don't need to free.</p>
<div class="refsect3">
<a name="id-1.4.10.8.11.5"></a><h4>Returns</h4>
<p> a nearest-neighbour interpolator. </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-interpolate-bilinear-static"></a><h3>vips_interpolate_bilinear_static ()</h3>
<pre class="programlisting"><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> *
vips_interpolate_bilinear_static (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>A convenience function that returns a bilinear interpolator you 
don't need to free.</p>
<div class="refsect3">
<a name="id-1.4.10.8.12.5"></a><h4>Returns</h4>
<p> a bilinear interpolator. </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-interpolate-new"></a><h3>vips_interpolate_new ()</h3>
<pre class="programlisting"><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> *
vips_interpolate_new (<em class="parameter"><code>const <span class="type">char</span> *nickname</code></em>);</pre>
<p>Look up an interpolator from a nickname and make one. You need to free the
result with <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a> when you're done with it.</p>
<p>See also: <a class="link" href="VipsObject.html#vips-type-find" title="vips_type_find ()"><code class="function">vips_type_find()</code></a>.</p>
<div class="refsect3">
<a name="id-1.4.10.8.13.6"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>nickname</p></td>
<td class="parameter_description"><p>nickname for interpolator</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.10.8.13.7"></a><h4>Returns</h4>
<p> an interpolator, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error.</p>
<p></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="VipsInterpolate.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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