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<h2><span class="refentrytitle"><a name="libgwydraw-GwyRGBA.top_of_page"></a>GwyRGBA</span></h2>
<p>GwyRGBA — Bit depth independet RGBA colors</p>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="libgwydraw-GwyRGBA.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libdraw/gwydraw.h>
<a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA">GwyRGBA</a>;
<a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="returnvalue">GwyRGBA</span></a> * <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-copy" title="gwy_rgba_copy ()">gwy_rgba_copy</a> (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-free" title="gwy_rgba_free ()">gwy_rgba_free</a> (<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-from-gdk-color" title="gwy_rgba_from_gdk_color ()">gwy_rgba_from_gdk_color</a> (<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> *gdkcolor</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-from-gdk-color-and-alpha" title="gwy_rgba_from_gdk_color_and_alpha ()">gwy_rgba_from_gdk_color_and_alpha</a> (<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> *gdkcolor</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint16"><span class="type">guint16</span></a> gdkalpha</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-get-from-container" title="gwy_rgba_get_from_container ()">gwy_rgba_get_from_container</a> (<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *container</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *prefix</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-interpolate" title="gwy_rgba_interpolate ()">gwy_rgba_interpolate</a> (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *src1</code></em>,
<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *src2</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-remove-from-container" title="gwy_rgba_remove_from_container ()">gwy_rgba_remove_from_container</a> (<em class="parameter"><code><a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *container</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *prefix</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-set-gdk-gc-bg" title="gwy_rgba_set_gdk_gc_bg ()">gwy_rgba_set_gdk_gc_bg</a> (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> *gc</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-set-gdk-gc-fg" title="gwy_rgba_set_gdk_gc_fg ()">gwy_rgba_set_gdk_gc_fg</a> (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> *gc</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-store-to-container" title="gwy_rgba_store_to_container ()">gwy_rgba_store_to_container</a> (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *container</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *prefix</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint16"><span class="returnvalue">guint16</span></a> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-to-gdk-alpha" title="gwy_rgba_to_gdk_alpha ()">gwy_rgba_to_gdk_alpha</a> (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-to-gdk-color" title="gwy_rgba_to_gdk_color ()">gwy_rgba_to_gdk_color</a> (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> *gdkcolor</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libgwydraw-GwyRGBA.description"></a><h2>Description</h2>
<p>
<a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> is a bit depth independent representation of an RGB or RGBA color,
using floating point values from the [0,1] interval.
</p>
<p>
<a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> is not an object, but a simple struct that can be allocated on
stack on created with <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a> or <code class="function">malloc()</code>. Helper functions for conversion
between <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> and <a href="http://developer.gnome.org/doc/API/2.0/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> (<a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-to-gdk-color" title="gwy_rgba_to_gdk_color ()"><code class="function">gwy_rgba_to_gdk_color()</code></a>,
<a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-from-gdk-color" title="gwy_rgba_from_gdk_color ()"><code class="function">gwy_rgba_from_gdk_color()</code></a>) and for <a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> storage by component
(<a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-store-to-container" title="gwy_rgba_store_to_container ()"><code class="function">gwy_rgba_store_to_container()</code></a>, <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-get-from-container" title="gwy_rgba_get_from_container ()"><code class="function">gwy_rgba_get_from_container()</code></a>) are provided.
</p>
</div>
<div class="refsect1">
<a name="libgwydraw-GwyRGBA.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GwyRGBA"></a><h3>GwyRGBA</h3>
<pre class="programlisting">typedef struct {
gdouble r;
gdouble g;
gdouble b;
gdouble a;
} GwyRGBA;
</pre>
<p>
RGB[A] color specification type.
</p>
<p>
All values are from the range [0,1].
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyRGBA.r"></a>r</code></em>;</span></p></td>
<td>The red component.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyRGBA.g"></a>g</code></em>;</span></p></td>
<td>The green component.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyRGBA.b"></a>b</code></em>;</span></p></td>
<td>The blue component.</td>
</tr>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GwyRGBA.a"></a>a</code></em>;</span></p></td>
<td>The alpha (opacity) value.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-copy"></a><h3>gwy_rgba_copy ()</h3>
<pre class="programlisting"><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="returnvalue">GwyRGBA</span></a> * gwy_rgba_copy (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>);</pre>
<p>
Makes a copy of a rgba structure. The result must be freed using
<a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-free" title="gwy_rgba_free ()"><code class="function">gwy_rgba_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>rgba</code></em> :</span></p></td>
<td>A RGBA color.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A copy of <em class="parameter"><code>rgba</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-free"></a><h3>gwy_rgba_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_rgba_free (<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>);</pre>
<p>
Frees an rgba structure created with <a class="link" href="libgwydraw-GwyRGBA.html#gwy-rgba-copy" title="gwy_rgba_copy ()"><code class="function">gwy_rgba_copy()</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>rgba</code></em> :</span></p></td>
<td>A RGBA color.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-from-gdk-color"></a><h3>gwy_rgba_from_gdk_color ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_rgba_from_gdk_color (<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> *gdkcolor</code></em>);</pre>
<p>
Converts a Gdk color to a rgba.
</p>
<p>
The alpha value is unchanged, as <a href="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> has no opacity information.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A RGBA color.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gdkcolor</code></em> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-from-gdk-color-and-alpha"></a><h3>gwy_rgba_from_gdk_color_and_alpha ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_rgba_from_gdk_color_and_alpha (<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> *gdkcolor</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> gdkalpha</code></em>);</pre>
<p>
Converts a Gdk color plus an opacity value to a rgba.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A RGBA color.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gdkcolor</code></em> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gdkalpha</code></em> :</span></p></td>
<td>Gdk 16bit opacity value.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-get-from-container"></a><h3>gwy_rgba_get_from_container ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gwy_rgba_get_from_container (<em class="parameter"><code><a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *container</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *prefix</code></em>);</pre>
<p>
Gets RGBA color components from a container.
</p>
<p>
This is a convenience function to get the components in the common
arrangement.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A RGBA color.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>container</code></em> :</span></p></td>
<td>A <a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> to get the color components from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prefix</code></em> :</span></p></td>
<td>Prefix in <em class="parameter"><code>container</code></em>, e.g. "/0/mask" (it would try to fetch
"/0/mask/red", "/0/mask/green", etc. then).</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Whether all <em class="parameter"><code>rgba</code></em> components were successfully found and set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-interpolate"></a><h3>gwy_rgba_interpolate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_rgba_interpolate (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *src1</code></em>,
<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *src2</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 class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>);</pre>
<p>
Linearly interpolates two colors, including alpha blending.
</p>
<p>
Correct blending of two not fully opaque colors is tricky. Always use
this function, not simple independent interpolation of r, g, b, and a.
</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>Color at point <em class="parameter"><code>x</code></em> = 0.0.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src2</code></em> :</span></p></td>
<td>Color at point <em class="parameter"><code>x</code></em> = 1.0.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>Point in interval 0..1 to take color from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> to store result to.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-remove-from-container"></a><h3>gwy_rgba_remove_from_container ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gwy_rgba_remove_from_container (<em class="parameter"><code><a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *container</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *prefix</code></em>);</pre>
<p>
Removes RGBA color components from a container.
</p>
<p>
This is a convenience function to remove the components in the common
arrangement.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>container</code></em> :</span></p></td>
<td>A <a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> to remove the color components from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prefix</code></em> :</span></p></td>
<td>Prefix in <em class="parameter"><code>container</code></em>, e.g. "/0/mask" (it will remove
"/0/mask/red", "/0/mask/green", etc. then).</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 anything was removed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-set-gdk-gc-bg"></a><h3>gwy_rgba_set_gdk_gc_bg ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_rgba_set_gdk_gc_bg (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> *gc</code></em>);</pre>
<p>
Sets foreground color of a Gdk graphics context from a RGBA color.
</p>
<p>
This is a convenience wrapper around <a href="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#gdk-gc-set-rgb-bg-color"><code class="function">gdk_gc_set_rgb_bg_color()</code></a>, see its
documentation for details and caveats.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A RGBA color. Its alpha component is ignored, only RGB is used.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gc</code></em> :</span></p></td>
<td>A Gdk graphics context to set forgeground color of.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-set-gdk-gc-fg"></a><h3>gwy_rgba_set_gdk_gc_fg ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_rgba_set_gdk_gc_fg (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> *gc</code></em>);</pre>
<p>
Sets foreground color of a Gdk graphics context from a RGBA color.
</p>
<p>
This is a convenience wrapper around <a href="/usr/share/gtk-doc/html/gdk/gdk-Graphics-Contexts.html#gdk-gc-set-rgb-fg-color"><code class="function">gdk_gc_set_rgb_fg_color()</code></a>, see its
documentation for details and caveats.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A RGBA color. Its alpha component is ignored, only RGB is used.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gc</code></em> :</span></p></td>
<td>A Gdk graphics context to set forgeground color of.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-store-to-container"></a><h3>gwy_rgba_store_to_container ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_rgba_store_to_container (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> *container</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *prefix</code></em>);</pre>
<p>
Stores RGBA color components to a container.
</p>
<p>
This is a convenience function to store the components in the common
arrangement.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A RGBA color.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>container</code></em> :</span></p></td>
<td>A <a href="./../libgwyddion/libgwyddion/GwyContainer.html"><span class="type">GwyContainer</span></a> to store the color components to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prefix</code></em> :</span></p></td>
<td>Prefix in <em class="parameter"><code>container</code></em>, e.g. "/0/mask" (it will store
"/0/mask/red", "/0/mask/green", etc. then).</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-to-gdk-alpha"></a><h3>gwy_rgba_to_gdk_alpha ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16"><span class="returnvalue">guint16</span></a> gwy_rgba_to_gdk_alpha (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>);</pre>
<p>
Converts a rgba to a Gdk opacity value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A RGBA color.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The opacity value as a 16bit integer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-rgba-to-gdk-color"></a><h3>gwy_rgba_to_gdk_color ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_rgba_to_gdk_color (<em class="parameter"><code>const <a class="link" href="libgwydraw-GwyRGBA.html#GwyRGBA" title="GwyRGBA"><span class="type">GwyRGBA</span></a> *rgba</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> *gdkcolor</code></em>);</pre>
<p>
Converts a rgba to a Gdk color.
</p>
<p>
Note no allocation is performed, just channel value conversion.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgba</code></em> :</span></p></td>
<td>A RGBA color.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gdkcolor</code></em> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/gdk/gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a>.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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