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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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                  <a href="#libvips-transform.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="libvips-transform"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libvips-transform.top_of_page"></a>transform</span></h2>
<p>transform</p>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="libvips-transform.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">                    <a class="link" href="libvips-transform.html#Transformation" title="Transformation">Transformation</a>;
<span class="returnvalue">void</span>                <a class="link" href="libvips-transform.html#im--transform-init" title="im__transform_init ()">im__transform_init</a>                  (<em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-transform.html#im--transform-calc-inverse" title="im__transform_calc_inverse ()">im__transform_calc_inverse</a>          (<em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-transform.html#im--transform-isidentity" title="im__transform_isidentity ()">im__transform_isidentity</a>            (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-transform.html#im--transform-add" title="im__transform_add ()">im__transform_add</a>                   (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *in1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *in2</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *out</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-transform.html#im--transform-print" title="im__transform_print ()">im__transform_print</a>                 (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-transform.html#im--transform-forward-point" title="im__transform_forward_point ()">im__transform_forward_point</a>         (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>,
                                                         <em class="parameter"><code>const <span class="type">double</span> x</code></em>,
                                                         <em class="parameter"><code>const <span class="type">double</span> y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *ox</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *oy</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-transform.html#im--transform-invert-point" title="im__transform_invert_point ()">im__transform_invert_point</a>          (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>,
                                                         <em class="parameter"><code>const <span class="type">double</span> x</code></em>,
                                                         <em class="parameter"><code>const <span class="type">double</span> y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *ox</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *oy</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-transform.html#im--transform-forward-rect" title="im__transform_forward_rect ()">im__transform_forward_rect</a>          (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *out</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-transform.html#im--transform-invert-rect" title="im__transform_invert_rect ()">im__transform_invert_rect</a>           (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *out</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-transform.html#im--transform-set-area" title="im__transform_set_area ()">im__transform_set_area</a>              (<em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *Param1</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-transform.html#im--affine" title="im__affine ()">im__affine</a>                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libvips-transform.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="libvips-transform.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="Transformation"></a><h3>Transformation</h3>
<pre class="programlisting">typedef struct {
	/* Area of input we can use. This can be smaller than the real input 
	 * image: we expand the input to add extra pixels for interpolation. 
	 */
	VipsRect iarea;			

	/* The area of the output we've been asked to generate. left/top can
	 * be negative.
	 */
	VipsRect oarea;

	/* The transform.
	 */
	double a, b, c, d;		
	double dx, dy;

	double ia, ib, ic, id;		/* Inverse of matrix abcd */
} Transformation;
</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-init"></a><h3>im__transform_init ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im__transform_init                  (<em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-calc-inverse"></a><h3>im__transform_calc_inverse ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im__transform_calc_inverse          (<em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-isidentity"></a><h3>im__transform_isidentity ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im__transform_isidentity            (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-add"></a><h3>im__transform_add ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im__transform_add                   (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *in1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *in2</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *out</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-print"></a><h3>im__transform_print ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im__transform_print                 (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-forward-point"></a><h3>im__transform_forward_point ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im__transform_forward_point         (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>,
                                                         <em class="parameter"><code>const <span class="type">double</span> x</code></em>,
                                                         <em class="parameter"><code>const <span class="type">double</span> y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *ox</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *oy</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-invert-point"></a><h3>im__transform_invert_point ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im__transform_invert_point          (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>,
                                                         <em class="parameter"><code>const <span class="type">double</span> x</code></em>,
                                                         <em class="parameter"><code>const <span class="type">double</span> y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *ox</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *oy</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-forward-rect"></a><h3>im__transform_forward_rect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im__transform_forward_rect          (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *out</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-invert-rect"></a><h3>im__transform_invert_rect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im__transform_invert_rect           (<em class="parameter"><code>const <a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *out</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--transform-set-area"></a><h3>im__transform_set_area ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im__transform_set_area              (<em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *Param1</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="im--affine"></a><h3>im__affine ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im__affine                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-transform.html#Transformation" title="Transformation"><span class="type">Transformation</span></a> *trn</code></em>);</pre>
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