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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#gdk-Points-Rectangles-and-Regions.synopsis" class="shortcut">Top</a>
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<a href="#gdk-Points-Rectangles-and-Regions.description" class="shortcut">Description</a>
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<div class="refentry" title="Points, Rectangles and Regions">
<a name="gdk-Points-Rectangles-and-Regions"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gdk-Points-Rectangles-and-Regions.top_of_page"></a>Points, Rectangles and Regions</span></h2>
<p>Points, Rectangles and Regions — Simple graphical data types</p>
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<div class="refsynopsisdiv" title="Synopsis">
<a name="gdk-Points-Rectangles-and-Regions.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gdk/gdk.h>
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkPoint" title="GdkPoint">GdkPoint</a>;
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle">GdkRectangle</a>;
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-rectangle-intersect" title="gdk_rectangle_intersect ()">gdk_rectangle_intersect</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src2</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *dest</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-rectangle-union" title="gdk_rectangle_union ()">gdk_rectangle_union</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src2</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *dest</code></em>);
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion">GdkRegion</a>;
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="returnvalue">GdkRegion</span></a> * <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-new" title="gdk_region_new ()">gdk_region_new</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="returnvalue">GdkRegion</span></a> * <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-polygon" title="gdk_region_polygon ()">gdk_region_polygon</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkPoint" title="GdkPoint"><span class="type">GdkPoint</span></a> *points</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n_points</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkFillRule" title="enum GdkFillRule"><span class="type">GdkFillRule</span></a> fill_rule</code></em>);
enum <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkFillRule" title="enum GdkFillRule">GdkFillRule</a>;
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="returnvalue">GdkRegion</span></a> * <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-copy" title="gdk_region_copy ()">gdk_region_copy</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>);
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="returnvalue">GdkRegion</span></a> * <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-rectangle" title="gdk_region_rectangle ()">gdk_region_rectangle</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rectangle</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-destroy" title="gdk_region_destroy ()">gdk_region_destroy</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-get-clipbox" title="gdk_region_get_clipbox ()">gdk_region_get_clipbox</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rectangle</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-get-rectangles" title="gdk_region_get_rectangles ()">gdk_region_get_rectangles</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> **rectangles</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *n_rectangles</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-empty" title="gdk_region_empty ()">gdk_region_empty</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-equal" title="gdk_region_equal ()">gdk_region_equal</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region2</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-rect-equal" title="gdk_region_rect_equal ()">gdk_region_rect_equal</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rectangle</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-point-in" title="gdk_region_point_in ()">gdk_region_point_in</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</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>);
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkOverlapType" title="enum GdkOverlapType"><span class="returnvalue">GdkOverlapType</span></a> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-rect-in" title="gdk_region_rect_in ()">gdk_region_rect_in</a> (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rectangle</code></em>);
enum <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkOverlapType" title="enum GdkOverlapType">GdkOverlapType</a>;
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-offset" title="gdk_region_offset ()">gdk_region_offset</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> dx</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> dy</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-shrink" title="gdk_region_shrink ()">gdk_region_shrink</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> dx</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> dy</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-union-with-rect" title="gdk_region_union_with_rect ()">gdk_region_union_with_rect</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rect</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-intersect" title="gdk_region_intersect ()">gdk_region_intersect</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source2</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-union" title="gdk_region_union ()">gdk_region_union</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source2</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-subtract" title="gdk_region_subtract ()">gdk_region_subtract</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source2</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-xor" title="gdk_region_xor ()">gdk_region_xor</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source2</code></em>);
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpan" title="GdkSpan">GdkSpan</a>;
<span class="returnvalue">void</span> (<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpanFunc" title="GdkSpanFunc ()">*GdkSpanFunc</a>) (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpan" title="GdkSpan"><span class="type">GdkSpan</span></a> *span</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-spans-intersect-foreach" title="gdk_region_spans_intersect_foreach ()">gdk_region_spans_intersect_foreach</a> (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpan" title="GdkSpan"><span class="type">GdkSpan</span></a> *spans</code></em>,
<em class="parameter"><code><span class="type">int</span> n_spans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> sorted</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpanFunc" title="GdkSpanFunc ()"><span class="type">GdkSpanFunc</span></a> function</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="gdk-Points-Rectangles-and-Regions.description"></a><h2>Description</h2>
<p>
GDK provides the <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkPoint" title="GdkPoint"><span class="type">GdkPoint</span></a>, <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>, <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> and <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpan" title="GdkSpan"><span class="type">GdkSpan</span></a> data types
for representing pixels and sets of pixels on the screen.
</p>
<p>
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkPoint" title="GdkPoint"><span class="type">GdkPoint</span></a> is a simple structure containing an x and y coordinate of a point.
</p>
<p>
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> is a structure holding the position and size of a rectangle.
The intersection of two rectangles can be computed with
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-rectangle-intersect" title="gdk_rectangle_intersect ()"><code class="function">gdk_rectangle_intersect()</code></a>. To find the union of two rectangles use
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-rectangle-union" title="gdk_rectangle_union ()"><code class="function">gdk_rectangle_union()</code></a>.
</p>
<p>
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> is an opaque data type holding a set of arbitrary pixels, and is
usually used for clipping graphical operations (see <a class="link" href="gdk-Graphics-Contexts.html#gdk-gc-set-clip-region" title="gdk_gc_set_clip_region ()"><code class="function">gdk_gc_set_clip_region()</code></a>).
</p>
<p>
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpan" title="GdkSpan"><span class="type">GdkSpan</span></a> is a structure holding a spanline. A spanline is a horizontal line that
is one pixel wide. It is mainly used when rasterizing other graphics primitives.
It can be intersected to regions by using <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-spans-intersect-foreach" title="gdk_region_spans_intersect_foreach ()"><code class="function">gdk_region_spans_intersect_foreach()</code></a>.
</p>
</div>
<div class="refsect1" title="Details">
<a name="gdk-Points-Rectangles-and-Regions.details"></a><h2>Details</h2>
<div class="refsect2" title="GdkPoint">
<a name="GdkPoint"></a><h3>GdkPoint</h3>
<pre class="programlisting">typedef struct {
gint x;
gint y;
} GdkPoint;
</pre>
<p>
Defines the x and y coordinates of a point.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkPoint.x"></a>x</code></em>;</span></p></td>
<td>the x coordinate of the point.
</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkPoint.y"></a>y</code></em>;</span></p></td>
<td>the y coordinate of the point.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GdkRectangle">
<a name="GdkRectangle"></a><h3>GdkRectangle</h3>
<pre class="programlisting">typedef struct {
gint x;
gint y;
gint width;
gint height;
} GdkRectangle;
</pre>
<p>
Defines the position and size of a rectangle.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkRectangle.x"></a>x</code></em>;</span></p></td>
<td>the x coordinate of the left edge of the rectangle.
</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkRectangle.y"></a>y</code></em>;</span></p></td>
<td>the y coordinate of the top of the rectangle.
</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkRectangle.width"></a>width</code></em>;</span></p></td>
<td>the width of the rectangle.
</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkRectangle.height"></a>height</code></em>;</span></p></td>
<td>the height of the rectangle.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_rectangle_intersect ()">
<a name="gdk-rectangle-intersect"></a><h3>gdk_rectangle_intersect ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gdk_rectangle_intersect (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src2</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *dest</code></em>);</pre>
<p>
Calculates the intersection of two rectangles. It is allowed for
<em class="parameter"><code>dest</code></em> to be the same as either <em class="parameter"><code>src1</code></em> or <em class="parameter"><code>src2</code></em>. If the rectangles
do not intersect, <em class="parameter"><code>dest</code></em>'s width and height is set to 0 and its x
and y values are undefined. If you are only interested in whether
the rectangles intersect, but not in the intersecting area itself,
pass <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for <em class="parameter"><code>dest</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src1</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src2</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td> return location for the intersection of <em class="parameter"><code>src1</code></em> and <em class="parameter"><code>src2</code></em>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>. </td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the rectangles intersect.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_rectangle_union ()">
<a name="gdk-rectangle-union"></a><h3>gdk_rectangle_union ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_rectangle_union (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *src2</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *dest</code></em>);</pre>
<p>
Calculates the union of two rectangles.
The union of rectangles <em class="parameter"><code>src1</code></em> and <em class="parameter"><code>src2</code></em> is the smallest rectangle which
includes both <em class="parameter"><code>src1</code></em> and <em class="parameter"><code>src2</code></em> within it.
It is allowed for <em class="parameter"><code>dest</code></em> to be the same as either <em class="parameter"><code>src1</code></em> or <em class="parameter"><code>src2</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src1</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src2</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>return location for the union of <em class="parameter"><code>src1</code></em> and <em class="parameter"><code>src2</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GdkRegion">
<a name="GdkRegion"></a><h3>GdkRegion</h3>
<pre class="programlisting">typedef struct _GdkRegion GdkRegion;</pre>
<p>
A GdkRegion represents a set of pixels on the screen.
</p>
</div>
<hr>
<div class="refsect2" title="gdk_region_new ()">
<a name="gdk-region-new"></a><h3>gdk_region_new ()</h3>
<pre class="programlisting"><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="returnvalue">GdkRegion</span></a> * gdk_region_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Creates a new empty <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>.
</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 new empty <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_polygon ()">
<a name="gdk-region-polygon"></a><h3>gdk_region_polygon ()</h3>
<pre class="programlisting"><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="returnvalue">GdkRegion</span></a> * gdk_region_polygon (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkPoint" title="GdkPoint"><span class="type">GdkPoint</span></a> *points</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n_points</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkFillRule" title="enum GdkFillRule"><span class="type">GdkFillRule</span></a> fill_rule</code></em>);</pre>
<p>
Creates a new <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> using the polygon defined by a
number of points.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>points</code></em> :</span></p></td>
<td>an array of <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkPoint" title="GdkPoint"><span class="type">GdkPoint</span></a> structs
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_points</code></em> :</span></p></td>
<td>the number of elements in the <em class="parameter"><code>points</code></em> array
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fill_rule</code></em> :</span></p></td>
<td>specifies which pixels are included in the region when the
polygon overlaps itself.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a new <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> based on the given polygon
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum GdkFillRule">
<a name="GdkFillRule"></a><h3>enum GdkFillRule</h3>
<pre class="programlisting">typedef enum
{
GDK_EVEN_ODD_RULE,
GDK_WINDING_RULE
} GdkFillRule;
</pre>
<p>
The method for determining which pixels are included in a region, when
creating a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> from a polygon.
The fill rule is only relevant for polygons which overlap themselves.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GDK-EVEN-ODD-RULE:CAPS"></a><span class="term"><code class="literal">GDK_EVEN_ODD_RULE</code></span></p></td>
<td>areas which are overlapped an odd number of times are
included in the region, while areas overlapped an even number of times are not.
</td>
</tr>
<tr>
<td><p><a name="GDK-WINDING-RULE:CAPS"></a><span class="term"><code class="literal">GDK_WINDING_RULE</code></span></p></td>
<td>overlapping areas are always included.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_copy ()">
<a name="gdk-region-copy"></a><h3>gdk_region_copy ()</h3>
<pre class="programlisting"><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="returnvalue">GdkRegion</span></a> * gdk_region_copy (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>);</pre>
<p>
Copies <em class="parameter"><code>region</code></em>, creating an identical new region.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a new region identical to <em class="parameter"><code>region</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_rectangle ()">
<a name="gdk-region-rectangle"></a><h3>gdk_region_rectangle ()</h3>
<pre class="programlisting"><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="returnvalue">GdkRegion</span></a> * gdk_region_rectangle (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rectangle</code></em>);</pre>
<p>
Creates a new region containing the area <em class="parameter"><code>rectangle</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rectangle</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a new region
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_destroy ()">
<a name="gdk-region-destroy"></a><h3>gdk_region_destroy ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_destroy (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>);</pre>
<p>
Destroys a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</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>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_get_clipbox ()">
<a name="gdk-region-get-clipbox"></a><h3>gdk_region_get_clipbox ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_get_clipbox (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rectangle</code></em>);</pre>
<p>
Obtains the smallest rectangle which includes the entire <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</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>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rectangle</code></em> :</span></p></td>
<td>return location for the clipbox
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_get_rectangles ()">
<a name="gdk-region-get-rectangles"></a><h3>gdk_region_get_rectangles ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_get_rectangles (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> **rectangles</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *n_rectangles</code></em>);</pre>
<p>
Obtains the area covered by the region as a list of rectangles.
The array returned in <em class="parameter"><code>rectangles</code></em> must be freed with <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free"><code class="function">g_free()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rectangles</code></em> :</span></p></td>
<td> return location for an array of rectangles. <acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n_rectangles. <acronym title="Free data container after the code is done."><span class="acronym">transfer container</span></acronym> length=n_rectangles. </td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_rectangles</code></em> :</span></p></td>
<td>length of returned array
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_empty ()">
<a name="gdk-region-empty"></a><h3>gdk_region_empty ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gdk_region_empty (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>);</pre>
<p>
Finds out if the <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> is empty.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>region</code></em> is empty.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_equal ()">
<a name="gdk-region-equal"></a><h3>gdk_region_equal ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gdk_region_equal (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region2</code></em>);</pre>
<p>
Finds out if the two regions are the same.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region1</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>region2</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>region1</code></em> and <em class="parameter"><code>region2</code></em> are equal.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_rect_equal ()">
<a name="gdk-region-rect-equal"></a><h3>gdk_region_rect_equal ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gdk_region_rect_equal (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rectangle</code></em>);</pre>
<p>
Finds out if a regions is the same as a rectangle.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rectangle</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>region</code></em> and <em class="parameter"><code>rectangle</code></em> are equal.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.18</p>
</div>
<hr>
<div class="refsect2" title="gdk_region_point_in ()">
<a name="gdk-region-point-in"></a><h3>gdk_region_point_in ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gdk_region_point_in (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</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>
Finds out if a point is in a region.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of a point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of a point
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the point is in <em class="parameter"><code>region</code></em>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_rect_in ()">
<a name="gdk-region-rect-in"></a><h3>gdk_region_rect_in ()</h3>
<pre class="programlisting"><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkOverlapType" title="enum GdkOverlapType"><span class="returnvalue">GdkOverlapType</span></a> gdk_region_rect_in (<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rectangle</code></em>);</pre>
<p>
Tests whether a rectangle is within a region.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rectangle</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GDK-OVERLAP-RECTANGLE-IN:CAPS"><code class="literal">GDK_OVERLAP_RECTANGLE_IN</code></a>, <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GDK-OVERLAP-RECTANGLE-OUT:CAPS"><code class="literal">GDK_OVERLAP_RECTANGLE_OUT</code></a>, or
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#GDK-OVERLAP-RECTANGLE-PART:CAPS"><code class="literal">GDK_OVERLAP_RECTANGLE_PART</code></a>, depending on whether the rectangle is inside,
outside, or partly inside the <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>, respectively.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum GdkOverlapType">
<a name="GdkOverlapType"></a><h3>enum GdkOverlapType</h3>
<pre class="programlisting">typedef enum
{
GDK_OVERLAP_RECTANGLE_IN,
GDK_OVERLAP_RECTANGLE_OUT,
GDK_OVERLAP_RECTANGLE_PART
} GdkOverlapType;
</pre>
<p>
Specifies the possible values returned by <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-rect-in" title="gdk_region_rect_in ()"><code class="function">gdk_region_rect_in()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GDK-OVERLAP-RECTANGLE-IN:CAPS"></a><span class="term"><code class="literal">GDK_OVERLAP_RECTANGLE_IN</code></span></p></td>
<td>if the rectangle is inside the <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>.
</td>
</tr>
<tr>
<td><p><a name="GDK-OVERLAP-RECTANGLE-OUT:CAPS"></a><span class="term"><code class="literal">GDK_OVERLAP_RECTANGLE_OUT</code></span></p></td>
<td>if the rectangle is outside the <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>.
</td>
</tr>
<tr>
<td><p><a name="GDK-OVERLAP-RECTANGLE-PART:CAPS"></a><span class="term"><code class="literal">GDK_OVERLAP_RECTANGLE_PART</code></span></p></td>
<td>if the rectangle is partly inside the <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_offset ()">
<a name="gdk-region-offset"></a><h3>gdk_region_offset ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_offset (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> dx</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> dy</code></em>);</pre>
<p>
Moves a region the specified distance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dx</code></em> :</span></p></td>
<td>the distance to move the region horizontally
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dy</code></em> :</span></p></td>
<td>the distance to move the region vertically
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_shrink ()">
<a name="gdk-region-shrink"></a><h3>gdk_region_shrink ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_shrink (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> dx</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> dy</code></em>);</pre>
<p>
Resizes a region by the specified amount.
Positive values shrink the region. Negative values expand it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dx</code></em> :</span></p></td>
<td>the number of pixels to shrink the region horizontally
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dy</code></em> :</span></p></td>
<td>the number of pixels to shrink the region vertically
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_union_with_rect ()">
<a name="gdk-region-union-with-rect"></a><h3>gdk_region_union_with_rect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_union_with_rect (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a> *rect</code></em>);</pre>
<p>
Sets the area of <em class="parameter"><code>region</code></em> to the union of the areas of <em class="parameter"><code>region</code></em> and
<em class="parameter"><code>rect</code></em>. The resulting area is the set of pixels contained in
either <em class="parameter"><code>region</code></em> or <em class="parameter"><code>rect</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rect</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRectangle" title="GdkRectangle"><span class="type">GdkRectangle</span></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_intersect ()">
<a name="gdk-region-intersect"></a><h3>gdk_region_intersect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_intersect (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source2</code></em>);</pre>
<p>
Sets the area of <em class="parameter"><code>source1</code></em> to the intersection of the areas of <em class="parameter"><code>source1</code></em>
and <em class="parameter"><code>source2</code></em>. The resulting area is the set of pixels contained in
both <em class="parameter"><code>source1</code></em> and <em class="parameter"><code>source2</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>source1</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>source2</code></em> :</span></p></td>
<td>another <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_union ()">
<a name="gdk-region-union"></a><h3>gdk_region_union ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_union (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source2</code></em>);</pre>
<p>
Sets the area of <em class="parameter"><code>source1</code></em> to the union of the areas of <em class="parameter"><code>source1</code></em> and
<em class="parameter"><code>source2</code></em>. The resulting area is the set of pixels contained in
either <em class="parameter"><code>source1</code></em> or <em class="parameter"><code>source2</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>source1</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>source2</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_subtract ()">
<a name="gdk-region-subtract"></a><h3>gdk_region_subtract ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_subtract (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source2</code></em>);</pre>
<p>
Subtracts the area of <em class="parameter"><code>source2</code></em> from the area <em class="parameter"><code>source1</code></em>. The resulting
area is the set of pixels contained in <em class="parameter"><code>source1</code></em> but not in <em class="parameter"><code>source2</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>source1</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>source2</code></em> :</span></p></td>
<td>another <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_xor ()">
<a name="gdk-region-xor"></a><h3>gdk_region_xor ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_xor (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source1</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *source2</code></em>);</pre>
<p>
Sets the area of <em class="parameter"><code>source1</code></em> to the exclusive-OR of the areas of <em class="parameter"><code>source1</code></em>
and <em class="parameter"><code>source2</code></em>. The resulting area is the set of pixels contained in one
or the other of the two sources but not in both.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>source1</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>source2</code></em> :</span></p></td>
<td>another <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GdkSpan">
<a name="GdkSpan"></a><h3>GdkSpan</h3>
<pre class="programlisting">typedef struct {
gint x;
gint y;
gint width;
} GdkSpan;
</pre>
<p>
A GdkSpan represents a horizontal line of pixels starting
at the pixel with coordinates <em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em> and ending before <em class="parameter"><code>x</code></em> + <em class="parameter"><code>width</code></em>, <em class="parameter"><code>y</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkSpan.x"></a>x</code></em>;</span></p></td>
<td>x coordinate of the first pixel.
</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkSpan.y"></a>y</code></em>;</span></p></td>
<td>y coordinate of the first pixel.
</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GdkSpan.width"></a>width</code></em>;</span></p></td>
<td>number of pixels in the span.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GdkSpanFunc ()">
<a name="GdkSpanFunc"></a><h3>GdkSpanFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GdkSpanFunc) (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpan" title="GdkSpan"><span class="type">GdkSpan</span></a> *span</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>
This defines the type of the function passed to
<a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-spans-intersect-foreach" title="gdk_region_spans_intersect_foreach ()"><code class="function">gdk_region_spans_intersect_foreach()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>span</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpan" title="GdkSpan"><span class="type">GdkSpan</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the user data passed to <a class="link" href="gdk-Points-Rectangles-and-Regions.html#gdk-region-spans-intersect-foreach" title="gdk_region_spans_intersect_foreach ()"><code class="function">gdk_region_spans_intersect_foreach()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gdk_region_spans_intersect_foreach ()">
<a name="gdk-region-spans-intersect-foreach"></a><h3>gdk_region_spans_intersect_foreach ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gdk_region_spans_intersect_foreach (<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a> *region</code></em>,
<em class="parameter"><code>const <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpan" title="GdkSpan"><span class="type">GdkSpan</span></a> *spans</code></em>,
<em class="parameter"><code><span class="type">int</span> n_spans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> sorted</code></em>,
<em class="parameter"><code><a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkSpanFunc" title="GdkSpanFunc ()"><span class="type">GdkSpanFunc</span></a> function</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>
Calls a function on each span in the intersection of <em class="parameter"><code>region</code></em> and <em class="parameter"><code>spans</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>region</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-Points-Rectangles-and-Regions.html#GdkRegion" title="GdkRegion"><span class="type">GdkRegion</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>spans</code></em> :</span></p></td>
<td>an array of <a href="gdk-Points-Rectangles-and-Regions.html#GdkSpan"><span class="type">GdkSpans</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_spans</code></em> :</span></p></td>
<td>the length of <em class="parameter"><code>spans</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sorted</code></em> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>spans</code></em> is sorted wrt. the y coordinate
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>function</code></em> :</span></p></td>
<td>function to call on each span in the intersection
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>data to pass to <em class="parameter"><code>function</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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