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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>rect</title>
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<tr><td colspan="5" class="shortcuts">
<a href="#libvips-rect.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#libvips-rect.description" class="shortcut">Description</a>
</td></tr>
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<div class="refentry">
<a name="libvips-rect"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libvips-rect.top_of_page"></a>rect</span></h2>
<p>rect — the VIPS rectangle class</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libvips-rect.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
</div>
<div class="refsynopsisdiv">
<a name="libvips-rect.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;vips/vips.h&gt;

                    <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect">VipsRect</a>;
#define             <a class="link" href="libvips-rect.html#VIPS-RECT-RIGHT:CAPS" title="VIPS_RECT_RIGHT()">VIPS_RECT_RIGHT</a>                     (R)
#define             <a class="link" href="libvips-rect.html#VIPS-RECT-BOTTOM:CAPS" title="VIPS_RECT_BOTTOM()">VIPS_RECT_BOTTOM</a>                    (R)
#define             <a class="link" href="libvips-rect.html#VIPS-RECT-HCENTRE:CAPS" title="VIPS_RECT_HCENTRE()">VIPS_RECT_HCENTRE</a>                   (R)
#define             <a class="link" href="libvips-rect.html#VIPS-RECT-VCENTRE:CAPS" title="VIPS_RECT_VCENTRE()">VIPS_RECT_VCENTRE</a>                   (R)
<span class="returnvalue">gboolean</span>            <a class="link" href="libvips-rect.html#vips-rect-isempty" title="vips_rect_isempty ()">vips_rect_isempty</a>                   (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="libvips-rect.html#vips-rect-includespoint" title="vips_rect_includespoint ()">vips_rect_includespoint</a>             (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> y</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="libvips-rect.html#vips-rect-includesrect" title="vips_rect_includesrect ()">vips_rect_includesrect</a>              (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r2</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="libvips-rect.html#vips-rect-equalsrect" title="vips_rect_equalsrect ()">vips_rect_equalsrect</a>                (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r2</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-rect.html#vips-rect-marginadjust" title="vips_rect_marginadjust ()">vips_rect_marginadjust</a>              (<em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> n</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-rect.html#vips-rect-intersectrect" title="vips_rect_intersectrect ()">vips_rect_intersectrect</a>             (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r2</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-rect.html#vips-rect-unionrect" title="vips_rect_unionrect ()">vips_rect_unionrect</a>                 (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r2</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>);
<a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="returnvalue">VipsRect</span></a> *          <a class="link" href="libvips-rect.html#vips-rect-dup" title="vips_rect_dup ()">vips_rect_dup</a>                       (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-rect.html#vips-rect-normalise" title="vips_rect_normalise ()">vips_rect_normalise</a>                 (<em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libvips-rect.description"></a><h2>Description</h2>
<p>
The <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> class and associated types and macros.
</p>
</div>
<div class="refsect1">
<a name="libvips-rect.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="VipsRect"></a><h3>VipsRect</h3>
<pre class="programlisting">typedef struct {
	int left;
	int top;
	int width;
	int height;
} VipsRect;
</pre>
<p>
A <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> is a rectangular area of pixels. This is a struct for
performing simple rectangle algebra.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="VipsRect.left"></a>left</code></em>;</span></p></td>
<td>left edge of rectangle</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="VipsRect.top"></a>top</code></em>;</span></p></td>
<td>top edge of rectangle</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="VipsRect.width"></a>width</code></em>;</span></p></td>
<td>width of rectangle</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="VipsRect.height"></a>height</code></em>;</span></p></td>
<td>height of rectangle</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-RECT-RIGHT:CAPS"></a><h3>VIPS_RECT_RIGHT()</h3>
<pre class="programlisting">#define VIPS_RECT_RIGHT(R) ((R)-&gt;left + (R)-&gt;width)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-RECT-BOTTOM:CAPS"></a><h3>VIPS_RECT_BOTTOM()</h3>
<pre class="programlisting">#define VIPS_RECT_BOTTOM(R) ((R)-&gt;top + (R)-&gt;height)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-RECT-HCENTRE:CAPS"></a><h3>VIPS_RECT_HCENTRE()</h3>
<pre class="programlisting">#define VIPS_RECT_HCENTRE(R) ((R)-&gt;left + (R)-&gt;width / 2)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-RECT-VCENTRE:CAPS"></a><h3>VIPS_RECT_VCENTRE()</h3>
<pre class="programlisting">#define VIPS_RECT_VCENTRE(R) ((R)-&gt;top + (R)-&gt;height / 2)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-isempty"></a><h3>vips_rect_isempty ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            vips_rect_isempty                   (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>);</pre>
<p>
Is <em class="parameter"><code>r</code></em> empty? ie. zero width or height.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>r</code></em> :</span></p></td>
<td>rectangle to test</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if <em class="parameter"><code>r</code></em> contains no pixels.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-includespoint"></a><h3>vips_rect_includespoint ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            vips_rect_includespoint             (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> y</code></em>);</pre>
<p>
Does <em class="parameter"><code>r</code></em> contain point (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>)?
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>r</code></em> :</span></p></td>
<td>rectangle to test</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>position to test for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>position to test for</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if <em class="parameter"><code>r</code></em> contains (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>).</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-includesrect"></a><h3>vips_rect_includesrect ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            vips_rect_includesrect              (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r2</code></em>);</pre>
<p>
Is <em class="parameter"><code>r2</code></em> a subset of <em class="parameter"><code>r1</code></em>?
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>r1</code></em> :</span></p></td>
<td>outer rectangle</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r2</code></em> :</span></p></td>
<td>inner rectangle</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if <em class="parameter"><code>r2</code></em> is a subset of <em class="parameter"><code>r1</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-equalsrect"></a><h3>vips_rect_equalsrect ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            vips_rect_equalsrect                (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r2</code></em>);</pre>
<p>
Is <em class="parameter"><code>r1</code></em> equal to <em class="parameter"><code>r2</code></em>?
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>r1</code></em> :</span></p></td>
<td>first rectangle</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r2</code></em> :</span></p></td>
<td>second rectangle</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if <em class="parameter"><code>r1</code></em> is equal to <em class="parameter"><code>r2</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-marginadjust"></a><h3>vips_rect_marginadjust ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_rect_marginadjust              (<em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> n</code></em>);</pre>
<p>
Enlarge <em class="parameter"><code>r</code></em> by <em class="parameter"><code>n</code></em>. +1 means out one pixel.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>r</code></em> :</span></p></td>
<td>rectangle to adjust</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
<td>enlarge by</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-intersectrect"></a><h3>vips_rect_intersectrect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_rect_intersectrect             (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r2</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>
<p>
Fill <em class="parameter"><code>out</code></em> with the intersection of <em class="parameter"><code>r1</code></em> and <em class="parameter"><code>r2</code></em>. <em class="parameter"><code>out</code></em> can equal <em class="parameter"><code>r1</code></em> or <em class="parameter"><code>r2</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>r1</code></em> :</span></p></td>
<td>input rectangle 1</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r2</code></em> :</span></p></td>
<td>input rectangle 2</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output rectangle</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-unionrect"></a><h3>vips_rect_unionrect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_rect_unionrect                 (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r1</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r2</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>
<p>
Fill <em class="parameter"><code>out</code></em> with the bounding box of <em class="parameter"><code>r1</code></em> and <em class="parameter"><code>r2</code></em>. <em class="parameter"><code>out</code></em> can equal <em class="parameter"><code>r1</code></em> or <em class="parameter"><code>r2</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>r1</code></em> :</span></p></td>
<td>input rectangle 1</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r2</code></em> :</span></p></td>
<td>input rectangle 2</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output rectangle</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-dup"></a><h3>vips_rect_dup ()</h3>
<pre class="programlisting"><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="returnvalue">VipsRect</span></a> *          vips_rect_dup                       (<em class="parameter"><code>const <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>);</pre>
<p>
Duplicate a rect to the heap. You need to free the result with <a class="link" href="libvips-memory.html#vips-free" title="vips_free ()"><code class="function">vips_free()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>r</code></em> :</span></p></td>
<td>rectangle to duplicate</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a pointer to copy of <em class="parameter"><code>r</code></em> allocated on the heap.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="vips-rect-normalise"></a><h3>vips_rect_normalise ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                vips_rect_normalise                 (<em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *r</code></em>);</pre>
<p>
Make sure width and height are &gt;0 by moving the origin and flipping the
rect.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>r</code></em> :</span></p></td>
<td>rect to normalise</td>
</tr></tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="libvips-rect.see-also"></a><h2>See Also</h2>
region
</div>
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