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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#pigment-PgmImaging.synopsis" class="shortcut">Top</a>
                 | 
                <a href="#pigment-PgmImaging.description" class="shortcut">Description</a>
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<div class="refentry" lang="en">
<a name="pigment-PgmImaging"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="pigment-PgmImaging.top_of_page"></a>PgmImaging</span></h2>
<p>PgmImaging — A library to process pixbufs through software filters.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="pigment-PgmImaging.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">

#include &lt;pgm/imaging/pgmimaging.h&gt;

<a
href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-gdk-pixbuf.html#GdkPixbuf"
>GdkPixbuf</a> *         <a class="link" href="pigment-PgmImaging.html#pgm-imaging-linear-alpha-gradient" title="pgm_imaging_linear_alpha_gradient ()">pgm_imaging_linear_alpha_gradient</a>   (const <a
href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-gdk-pixbuf.html#GdkPixbuf"
>GdkPixbuf</a> *pixbuf,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> start_x,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> start_y,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> start_alpha,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> end_x,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> end_y,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> end_alpha);
</pre>
</div>
<div class="refsect1" lang="en">
<a name="pigment-PgmImaging.description"></a><h2>Description</h2>
<p>
<span class="type">PgmImaging</span> is a library providing several software image processing filters.
The functions can be used as CPU (Central Processing Unit) software fallback
when effects can't be applied by Pigment plugins through the GPU (Graphics
Processing Unit).
</p>
<p>
Last reviewed on 2008-07-29 (0.3.7)</p>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="pigment-PgmImaging.details"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="pgm-imaging-linear-alpha-gradient"></a><h3>pgm_imaging_linear_alpha_gradient ()</h3>
<pre class="programlisting"><a
href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-gdk-pixbuf.html#GdkPixbuf"
>GdkPixbuf</a> *         pgm_imaging_linear_alpha_gradient   (const <a
href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-gdk-pixbuf.html#GdkPixbuf"
>GdkPixbuf</a> *pixbuf,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> start_x,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> start_y,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> start_alpha,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> end_x,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> end_y,
                                                         <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gfloat"
>gfloat</a> end_alpha);</pre>
<p>
Creates a new <a
href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-gdk-pixbuf.html#GdkPixbuf"
><span class="type">GdkPixbuf</span></a> by compositing the alpha channel of <em class="parameter"><code>pixbuf</code></em> with
the linear alpha gradient mask given as parameters. Note that the resulting
pixbuf always contains an alpha channel even if the original <em class="parameter"><code>pixbuf</code></em> does
not. In that case, the alpha channel is automatically added with a default
value of 1.0 corresponding to opaque pixels.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pixbuf</code></em> :</span></p></td>
<td> A <a
href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-gdk-pixbuf.html#GdkPixbuf"
><span class="type">GdkPixbuf</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>start_x</code></em> :</span></p></td>
<td> x coordinate of the start point, in the range [0.0, 1.0].
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>start_y</code></em> :</span></p></td>
<td> y coordinate of the start point, in the range [0.0, 1.0].
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>start_alpha</code></em> :</span></p></td>
<td> Alpha component at the start point, in the range [0.0, 1.0].
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>end_x</code></em> :</span></p></td>
<td> x coordinate of the end point, in the range [0.0, 1.0].
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>end_y</code></em> :</span></p></td>
<td> y coordinate of the end point, in the range [0.0, 1.0].
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>end_alpha</code></em> :</span></p></td>
<td> Alpha component at the end point, in the range [0.0, 1.0].
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> A newly-created <a
href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-gdk-pixbuf.html#GdkPixbuf"
><span class="type">GdkPixbuf</span></a> with a reference count of 1, or <a
href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL--CAPS"
><code class="literal">NULL</code></a> if
not enough memory could be allocated.
</td>
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