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<h2><span class="refentrytitle"><a name="libvips-transform.top_of_page"></a>transform</span></h2>
<p>transform</p>
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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>
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<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>
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<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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