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<div class="refentry">
<a name="VipsInterpolate"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="VipsInterpolate.top_of_page"></a>VipsInterpolate</span></h2>
<p>VipsInterpolate — various interpolators: nearest, bilinear, bicubic, and
some non-linear</p>
</td>
<td 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="refsynopsisdiv">
<a name="VipsInterpolate.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <vips/vips.h>
#define <a class="link" href="VipsInterpolate.html#VIPS-INTERPOLATE-SCALE:CAPS" title="VIPS_INTERPOLATE_SCALE">VIPS_INTERPOLATE_SCALE</a>
#define <a class="link" href="VipsInterpolate.html#VIPS-INTERPOLATE-SHIFT:CAPS" title="VIPS_INTERPOLATE_SHIFT">VIPS_INTERPOLATE_SHIFT</a>
#define <a class="link" href="VipsInterpolate.html#VIPS-TRANSFORM-SCALE:CAPS" title="VIPS_TRANSFORM_SCALE">VIPS_TRANSFORM_SCALE</a>
#define <a class="link" href="VipsInterpolate.html#VIPS-TRANSFORM-SHIFT:CAPS" title="VIPS_TRANSFORM_SHIFT">VIPS_TRANSFORM_SHIFT</a>
<a class="link" href="VipsInterpolate.html#VipsInterpolate-struct" title="VipsInterpolate">VipsInterpolate</a>;
<a class="link" href="VipsInterpolate.html#VipsInterpolateClass" title="VipsInterpolateClass">VipsInterpolateClass</a>;
<span class="returnvalue">void</span> (<a class="link" href="VipsInterpolate.html#VipsInterpolateMethod" title="VipsInterpolateMethod ()">*VipsInterpolateMethod</a>) (<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>);
<span class="returnvalue">void</span> <a class="link" href="VipsInterpolate.html#vips-interpolate" title="vips_interpolate ()">vips_interpolate</a> (<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>);
<a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> * <a class="link" href="VipsInterpolate.html#vips-interpolate-bilinear-static" title="vips_interpolate_bilinear_static ()">vips_interpolate_bilinear_static</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="VipsInterpolate.html#VipsInterpolateMethod" title="VipsInterpolateMethod ()"><span class="returnvalue">VipsInterpolateMethod</span></a> <a class="link" href="VipsInterpolate.html#vips-interpolate-get-method" title="vips_interpolate_get_method ()">vips_interpolate_get_method</a> (<em class="parameter"><code><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="type">VipsInterpolate</span></a> *interpolate</code></em>);
<span class="returnvalue">int</span> <a class="link" href="VipsInterpolate.html#vips-interpolate-get-window-offset" title="vips_interpolate_get_window_offset ()">vips_interpolate_get_window_offset</a> (<em class="parameter"><code><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="type">VipsInterpolate</span></a> *interpolate</code></em>);
<span class="returnvalue">int</span> <a class="link" href="VipsInterpolate.html#vips-interpolate-get-window-size" title="vips_interpolate_get_window_size ()">vips_interpolate_get_window_size</a> (<em class="parameter"><code><a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="type">VipsInterpolate</span></a> *interpolate</code></em>);
<a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> * <a class="link" href="VipsInterpolate.html#vips-interpolate-nearest-static" title="vips_interpolate_nearest_static ()">vips_interpolate_nearest_static</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="VipsInterpolate.html" title="VipsInterpolate"><span class="returnvalue">VipsInterpolate</span></a> * <a class="link" href="VipsInterpolate.html#vips-interpolate-new" title="vips_interpolate_new ()">vips_interpolate_new</a> (<em class="parameter"><code>const <span class="type">char</span> *nickname</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="VipsInterpolate.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GObject
+----<a class="link" href="VipsObject.html" title="VipsObject">VipsObject</a>
+----VipsInterpolate
</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.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="VIPS-INTERPOLATE-SCALE:CAPS"></a><h3>VIPS_INTERPOLATE_SCALE</h3>
<pre class="programlisting">#define VIPS_INTERPOLATE_SCALE (1 << 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-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-TRANSFORM-SCALE:CAPS"></a><h3>VIPS_TRANSFORM_SCALE</h3>
<pre class="programlisting">#define VIPS_TRANSFORM_SCALE (1 << 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-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="VipsInterpolate-struct"></a><h3>VipsInterpolate</h3>
<pre class="programlisting">typedef struct _VipsInterpolate VipsInterpolate;</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsInterpolateClass"></a><h3>VipsInterpolateClass</h3>
<pre class="programlisting">typedef struct {
VipsObjectClass parent_class;
/* Write to pixel out(x,y), interpolating from in(x,y). The caller has
* to set the regions up.
*/
VipsInterpolateMethod interpolate;
/* This interpolator needs a window this many pixels across and down.
*/
int (*get_window_size)( VipsInterpolate * );
/* Or just set this if you want a constant.
*/
int window_size;
/* Stencils are offset by this much. Default to window_size / 2 - 1
* (centering) if get_window_offset is NULL and window_offset is -1.
*/
int (*get_window_offset)( VipsInterpolate * );
int window_offset;
} VipsInterpolateClass;
</pre>
<p>
The abstract base class for the various VIPS interpolation functions.
Use "vips --list classes" to see all the interpolators available.
</p>
<p>
An interpolator consists of a function to perform the interpolation, plus
some extra data fields which tell vips how to call the function and what
data it needs.
</p>
<p>
<em class="parameter"><code>window_size</code></em> is the size of the window that the interpolator needs. For
example, a bicubic interpolator needs to see a window of 4x4 pixels to be
able to interpolate a value.
</p>
<p>
You can either have a function in <em class="parameter"><code>get_window_size</code></em> which returns the window
that a specific interpolator needs, or you can leave <em class="parameter"><code>get_window_size</code></em> <code class="literal">NULL</code>
and set a constant value in <em class="parameter"><code>window_size</code></em>.
</p>
<p>
<em class="parameter"><code>window_offset</code></em> is how much to offset the window up and left of (x, y). For
example, a bicubic interpolator will want a <em class="parameter"><code>window_offset</code></em> of 1.
</p>
<p>
You can either have a function in <em class="parameter"><code>get_window_offset</code></em> which returns the
offset that a specific interpolator needs, or you can leave
<em class="parameter"><code>get_window_offset</code></em> <code class="literal">NULL</code> and set a constant value in <em class="parameter"><code>window_offset</code></em>.
</p>
<p>
You also need to set <em class="parameter"><code>nickname</code></em> and <em class="parameter"><code>description</code></em> in <a class="link" href="VipsObject.html" title="VipsObject"><span class="type">VipsObject</span></a>.
</p>
<p>
See also: <a class="link" href="VipsInterpolate.html#VipsInterpolateMethod" title="VipsInterpolateMethod ()"><span class="type">VipsInterpolateMethod</span></a>, <a class="link" href="VipsObject.html" title="VipsObject"><span class="type">VipsObject</span></a>,
<a class="link" href="VipsInterpolate.html#vips-interpolate-bilinear-static" title="vips_interpolate_bilinear_static ()"><code class="function">vips_interpolate_bilinear_static()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="VipsObject.html#VipsObjectClass" title="struct VipsObjectClass"><span class="type">VipsObjectClass</span></a> <em class="structfield"><code><a name="VipsInterpolateClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td></td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="VipsInterpolate.html#VipsInterpolateMethod" title="VipsInterpolateMethod ()"><span class="type">VipsInterpolateMethod</span></a> <em class="structfield"><code><a name="VipsInterpolateClass.interpolate"></a>interpolate</code></em>;</span></p></td>
<td>the interpolation method</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="VipsInterpolateClass.get-window-size"></a>get_window_size</code></em> ()</span></p></td>
<td>return the size of the window needed by this method</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="VipsInterpolateClass.window-size"></a>window_size</code></em>;</span></p></td>
<td>or just set this for a constant window size</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="VipsInterpolateClass.get-window-offset"></a>get_window_offset</code></em> ()</span></p></td>
<td>return the window offset for this method</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="VipsInterpolateClass.window-offset"></a>window_offset</code></em>;</span></p></td>
<td>or just set this for a constant window offset</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VipsInterpolateMethod"></a><h3>VipsInterpolateMethod ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*VipsInterpolateMethod) (<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
<code class="function">IM_REGION_ADDR()</code>, 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: <a class="link" href="VipsInterpolate.html#VipsInterpolateClass" title="VipsInterpolateClass"><span class="type">VipsInterpolateClass</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolate</code></em> :</span></p></td>
<td>the interpolator</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>write the interpolated pixel here</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>read source pixels from here</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>interpolate value at this position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>interpolate value at this position</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolate</code></em> :</span></p></td>
<td>interpolator to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>write result here</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>read source data from here</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>interpolate value at this position</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>interpolate value at this position</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a bilinear interpolator. <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>
<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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolate</code></em> :</span></p></td>
<td>interpolator to use</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a pointer to the interpolation function</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>interpolate</code></em> :</span></p></td>
<td>interpolator to use</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the interpolators required window offset</td>
</tr>
</tbody>
</table></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>
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<td><p><span class="term"><em class="parameter"><code>interpolate</code></em> :</span></p></td>
<td>interpolator to use</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the interpolators required window size</td>
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<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>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a nearest-neighbour interpolator. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
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<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 <code class="function">g_object_unref()</code> 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>
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<td><p><span class="term"><em class="parameter"><code>nickname</code></em> :</span></p></td>
<td>nickname for interpolator</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>an interpolator, or <code class="literal">NULL</code> on error.</td>
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