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<title>GimpBilinear: GIMP Color Library Reference Manual</title>
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<a href="#libgimpcolor-GimpBilinear.description" class="shortcut">Description</a></span>
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<a name="libgimpcolor-GimpBilinear"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="libgimpcolor-GimpBilinear.top_of_page"></a>GimpBilinear</span></h2>
<p>GimpBilinear — Utility functions for bilinear interpolation.</p>
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<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libgimpcolor-GimpBilinear.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>
</td>
<td class="function_name">
<a class="link" href="libgimpcolor-GimpBilinear.html#gimp-bilinear" title="gimp_bilinear ()">gimp_bilinear</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="returnvalue">guchar</span></a>
</td>
<td class="function_name">
<a class="link" href="libgimpcolor-GimpBilinear.html#gimp-bilinear-8" title="gimp_bilinear_8 ()">gimp_bilinear_8</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16"><span class="returnvalue">guint16</span></a>
</td>
<td class="function_name">
<a class="link" href="libgimpcolor-GimpBilinear.html#gimp-bilinear-16" title="gimp_bilinear_16 ()">gimp_bilinear_16</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="returnvalue">guint32</span></a>
</td>
<td class="function_name">
<a class="link" href="libgimpcolor-GimpBilinear.html#gimp-bilinear-32" title="gimp_bilinear_32 ()">gimp_bilinear_32</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libgimpcolor-GimpRGB.html#GimpRGB" title="struct GimpRGB"><span class="returnvalue">GimpRGB</span></a>
</td>
<td class="function_name">
<a class="link" href="libgimpcolor-GimpBilinear.html#gimp-bilinear-rgb" title="gimp_bilinear_rgb ()">gimp_bilinear_rgb</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libgimpcolor-GimpRGB.html#GimpRGB" title="struct GimpRGB"><span class="returnvalue">GimpRGB</span></a>
</td>
<td class="function_name">
<a class="link" href="libgimpcolor-GimpBilinear.html#gimp-bilinear-rgba" title="gimp_bilinear_rgba ()">gimp_bilinear_rgba</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgimpcolor-GimpBilinear.html#gimp-bilinear-pixels-8" title="gimp_bilinear_pixels_8 ()">gimp_bilinear_pixels_8</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libgimpcolor-GimpBilinear.description"></a><h2>Description</h2>
<p>Utility functions for bilinear interpolation.</p>
</div>
<div class="refsect1">
<a name="libgimpcolor-GimpBilinear.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gimp-bilinear"></a><h3>gimp_bilinear ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>
gimp_bilinear (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *values</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gimp-bilinear-8"></a><h3>gimp_bilinear_8 ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="returnvalue">guchar</span></a>
gimp_bilinear_8 (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *values</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gimp-bilinear-16"></a><h3>gimp_bilinear_16 ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16"><span class="returnvalue">guint16</span></a>
gimp_bilinear_16 (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16"><span class="type">guint16</span></a> *values</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gimp-bilinear-32"></a><h3>gimp_bilinear_32 ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="returnvalue">guint32</span></a>
gimp_bilinear_32 (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> *values</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gimp-bilinear-rgb"></a><h3>gimp_bilinear_rgb ()</h3>
<pre class="programlisting"><a class="link" href="libgimpcolor-GimpRGB.html#GimpRGB" title="struct GimpRGB"><span class="returnvalue">GimpRGB</span></a>
gimp_bilinear_rgb (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a class="link" href="libgimpcolor-GimpRGB.html#GimpRGB" title="struct GimpRGB"><span class="type">GimpRGB</span></a> *values</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gimp-bilinear-rgba"></a><h3>gimp_bilinear_rgba ()</h3>
<pre class="programlisting"><a class="link" href="libgimpcolor-GimpRGB.html#GimpRGB" title="struct GimpRGB"><span class="returnvalue">GimpRGB</span></a>
gimp_bilinear_rgba (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a class="link" href="libgimpcolor-GimpRGB.html#GimpRGB" title="struct GimpRGB"><span class="type">GimpRGB</span></a> *values</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gimp-bilinear-pixels-8"></a><h3>gimp_bilinear_pixels_8 ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gimp_bilinear_pixels_8 (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *dest</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> bpp</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> has_alpha</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> **values</code></em>);</pre>
<p>Computes bilinear interpolation of four pixels.</p>
<p>When <em class="parameter"><code>has_alpha</code></em>
is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>, it's identical to <a class="link" href="libgimpcolor-GimpBilinear.html#gimp-bilinear-8" title="gimp_bilinear_8 ()"><code class="function">gimp_bilinear_8()</code></a> on
each channel separately. When <em class="parameter"><code>has_alpha</code></em>
is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, it handles
alpha channel correctly.</p>
<p>The pixels in <em class="parameter"><code>values</code></em>
correspond to corner x, y coordinates in the
following order: [0,0], [1,0], [0,1], [1,1].</p>
<div class="refsect3">
<a name="gimp-bilinear-pixels-8.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dest</p></td>
<td class="parameter_description"><p>Pixel, where interpolation result is to be stored.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>x-coordinate (0.0 to 1.0).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>y-coordinate (0.0 to 1.0).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>bpp</p></td>
<td class="parameter_description"><p>Bytes per pixel. <em class="parameter"><code>dest</code></em>
and each <em class="parameter"><code>values</code></em>
item is an array of
<em class="parameter"><code>bpp</code></em>
bytes.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>has_alpha</p></td>
<td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the last channel is an alpha channel.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>values</p></td>
<td class="parameter_description"><p>Array of four pointers to pixels.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="libgimpcolor-GimpBilinear.other_details"></a><h2>Types and Values</h2>
</div>
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