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<title>VIPS_INTERPOLATE(3) manual page</title>
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<a href='#toc'>Table of Contents</a><p>
<h2><a name='sect0' href='#toc0'>Name</a></h2>
VipsInterpolate, vips_interpolate, vips_interpolate_get_method, vips_interpolate_get_window_size
- base class for VIPS interpolators
<h2><a name='sect1' href='#toc1'>Synopsis</a></h2>
#include <vips/vips.h>
<p> typedef
void (*VipsInterpolateMethod)( VipsInterpolate *, <br>
PEL *out, REGION *in, double x, double y );<br>
<p> typedef struct _VipsInterpolateClass { <br>
VipsObjectClass parent_class;<br>
<p> VipsInterpolateMethod interpolate;<br>
<br>
int (*get_window_size)( VipsInterpolate * );<br>
<br>
int window_size;<br>
<br>
} VipsInterpolateClass;
<p> void vips_interpolate( VipsInterpolate *interpolate,
<br>
PEL *out, REGION *in, double x, double y );<br>
<br>
VipsInterpolateMethod vips_interpolate_get_method( VipsInterpolate * );
<br>
int vips_interpolate_get_window_size( VipsInterpolate *interpolate );
<p>
VipsInterpolate *vips_interpolate_nearest_static( void ); <br>
VipsInterpolate *vips_interpolate_bilinear_static( void ); <br>
VipsInterpolate *vips_interpolate_bicubic_static( void );
<p> VipsInterpolate
*vips_interpolate_new( const char *nickname );
<p>
<h2><a name='sect2' href='#toc2'>Description</a></h2>
<b>VipsInterpolate</b>
is the base class for VIPS interpolators. It provides a simple framework
that subclasses use to implement the various interpolators that VIPS ships
with. You can add new interpolators by subclassing <b>VipsInterpolated</b> and
implementing an <b>interpolate</b> method. You can use any interpolator in your
code via the methods of <b>VipsInterpolate.</b>
<p> <a href='vips_interpolate.3.html'><b>vips_interpolate(3)</b></a>
looks up
the interpolate method for the object and calls it for you.
<p> <a href='vips_interpolate_get_method.3.html'><b>vips_interpolate_get_method(3)</b></a>
just does the lookup and returns a pointer to the interpolate function.
You can use this to take the lookup out of an inner loop.
<p> <a href='vips_interpolate_get_window_size.3.html'><b>vips_interpolate_get_window_size(3)</b></a>
either calls <b>get_window_size()</b> or if it is NULL, returns <b>window_size.</b>
<p> <a href='vips_interpolate_nearest_static.3.html'><b>vips_interpolate_nearest_static(3)</a>
,</b> <a href='vips_interpolate_bilinear_static.3.html'><b>vips_interpolate_bilinear_static(3)</b></a>
and <a href='vips_interpolate_bicubic_static.3.html'><b>vips_interpolate_bicubic_static(3)</b></a>
are convenience functions which
return a pointer to a static instance of a nearest-neighbour, bilinear and
bicubic interpolator. You can pass these to any function which needs a
<b>VipsInterpolator</b> as an argument. No need to free the result.
<p> <a href='vips_interpolate_new.3.html'><b>vips_interpolate_new(3)</b></a>
is a convenience function which makes an interpolator from a nickname. Free
the result with <a href='g_object_unref.3.html'><b>g_object_unref(3)</b></a>
when you’re done with it.
<p>
<h2><a name='sect3' href='#toc3'>Supported Interpolators</a></h2>
<p>
<p>You can list the supported interpolators with
<p> $ vips --list classes<br>
<p> look for subclasses of <b>VipsInterpolate.</b>
<p>
<h2><a name='sect4' href='#toc4'>Return Value</a></h2>
Unless otherwise
noted, functions return 0 success and -1 on error.
<h2><a name='sect5' href='#toc5'>See Also</a></h2>
<a href='VipsObject.3.html'>VipsObject(3)</a>
,
<a href='VipsInterpolate.3.html'>VipsInterpolate(3)</a>
, <a href='vips_type_find.3.html'>vips_type_find(3)</a>
, <a href='vips.1.html'>vips(1)</a>
.
<h2><a name='sect6' href='#toc6'>Author</a></h2>
John Cupitt <p>
<hr><p>
<a name='toc'><b>Table of Contents</b></a><p>
<ul>
<li><a name='toc0' href='#sect0'>Name</a></li>
<li><a name='toc1' href='#sect1'>Synopsis</a></li>
<li><a name='toc2' href='#sect2'>Description</a></li>
<li><a name='toc3' href='#sect3'>Supported Interpolators</a></li>
<li><a name='toc4' href='#sect4'>Return Value</a></li>
<li><a name='toc5' href='#sect5'>See Also</a></li>
<li><a name='toc6' href='#sect6'>Author</a></li>
</ul>
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