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<a name="libgimp-gimppixelrgn"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="libgimp-gimppixelrgn.top_of_page"></a>gimppixelrgn</span></h2>
<p>gimppixelrgn — Functions for operating on pixel regions.</p>
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<div class="refsynopsisdiv">
<a name="libgimp-gimppixelrgn.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn">GimpPixelRgn</a>;
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-init" title="gimp_pixel_rgn_init ()">gimp_pixel_rgn_init</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><a class="link" href="libgimp-gimpdrawable.html#GimpDrawable" title="GimpDrawable"><span class="type">GimpDrawable</span></a> *drawable</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>,
<em class="parameter"><code><span class="type">gint</span> dirty</code></em>,
<em class="parameter"><code><span class="type">gint</span> shadow</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-resize" title="gimp_pixel_rgn_resize ()">gimp_pixel_rgn_resize</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-get-pixel" title="gimp_pixel_rgn_get_pixel ()">gimp_pixel_rgn_get_pixel</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-get-row" title="gimp_pixel_rgn_get_row ()">gimp_pixel_rgn_get_row</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-get-col" title="gimp_pixel_rgn_get_col ()">gimp_pixel_rgn_get_col</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-get-rect" title="gimp_pixel_rgn_get_rect ()">gimp_pixel_rgn_get_rect</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-set-pixel" title="gimp_pixel_rgn_set_pixel ()">gimp_pixel_rgn_set_pixel</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code>const <span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-set-row" title="gimp_pixel_rgn_set_row ()">gimp_pixel_rgn_set_row</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code>const <span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-set-col" title="gimp_pixel_rgn_set_col ()">gimp_pixel_rgn_set_col</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code>const <span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgn-set-rect" title="gimp_pixel_rgn_set_rect ()">gimp_pixel_rgn_set_rect</a> (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code>const <span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);
<span class="returnvalue">gpointer</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgns-register" title="gimp_pixel_rgns_register ()">gimp_pixel_rgns_register</a> (<em class="parameter"><code><span class="type">gint</span> nrgns</code></em>,
<em class="parameter"><code>...</code></em>);
<span class="returnvalue">gpointer</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgns-register2" title="gimp_pixel_rgns_register2 ()">gimp_pixel_rgns_register2</a> (<em class="parameter"><code><span class="type">gint</span> nrgns</code></em>,
<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> **prs</code></em>);
<span class="returnvalue">gpointer</span> <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgns-process" title="gimp_pixel_rgns_process ()">gimp_pixel_rgns_process</a> (<em class="parameter"><code><span class="type">gpointer</span> pri_ptr</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libgimp-gimppixelrgn.description"></a><h2>Description</h2>
<p>
Functions for operating on pixel regions. These functions provide
fast ways of accessing and modifying portions of a drawable.
</p>
</div>
<div class="refsect1">
<a name="libgimp-gimppixelrgn.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GimpPixelRgn"></a><h3>GimpPixelRgn</h3>
<pre class="programlisting">typedef struct {
guchar *data; /* pointer to region data */
GimpDrawable *drawable; /* pointer to drawable */
guint bpp; /* bytes per pixel */
guint rowstride; /* bytes per pixel row */
guint x, y; /* origin */
guint w, h; /* width and height of region */
guint dirty : 1; /* will this region be dirtied? */
guint shadow : 1; /* will this region use the shadow or normal tiles */
guint process_count; /* used internally */
} GimpPixelRgn;
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-init"></a><h3>gimp_pixel_rgn_init ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_init (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><a class="link" href="libgimp-gimpdrawable.html#GimpDrawable" title="GimpDrawable"><span class="type">GimpDrawable</span></a> *drawable</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>,
<em class="parameter"><code><span class="type">gint</span> dirty</code></em>,
<em class="parameter"><code><span class="type">gint</span> shadow</code></em>);</pre>
<p>
Initialize the pixel region pointed by <em class="parameter"><code>pr</code></em> with the specified parameters.
</p>
<p>
The <em class="parameter"><code>dirty</code></em> and <em class="parameter"><code>shadow</code></em> flags can be used as follows:
</p>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><em class="parameter"><code>dirty</code></em> = FALSE, <em class="parameter"><code>shadow</code></em> = FALSE: the region will be used to read
the actual drawable datas. This
is useful for save plug-ins or for
filters.</p></li></ul></div>
<p>
</p>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><em class="parameter"><code>dirty</code></em> = FALSE, <em class="parameter"><code>shadow</code></em> = TRUE: the region will be used to read the
shadow tiles. This is used in
some filter plug-ins which operate
in two passes such as gaussian
blur. The first pass reads the
actual drawable data and writes to
the shadow tiles, and the second
one reads from and writes to the
shadow tiles.</p></li></ul></div>
<p>
</p>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><em class="parameter"><code>dirty</code></em> = TRUE, <em class="parameter"><code>shadow</code></em> = TRUE: the region will be used to write to
the shadow tiles. It is common
practice to write to the shadow
tiles and then use
<a class="link" href="libgimp-gimpdrawable.html#gimp-drawable-merge-shadow" title="gimp_drawable_merge_shadow ()"><code class="function">gimp_drawable_merge_shadow()</code></a> to
merge the changes from the shadow
tiles using the current selection
as a mask.</p></li></ul></div>
<p>
</p>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><em class="parameter"><code>dirty</code></em> = TRUE, <em class="parameter"><code>shadow</code></em> = FALSE: the region will be used to directly
change the drawable content. Don't
do this, since this could prevent
the Undo-System from working as
expected.</p></li></ul></div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> variable.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>drawable</code></em> :</span></p></td>
<td>the <a class="link" href="libgimp-gimpdrawable.html#GimpDrawable" title="GimpDrawable"><span class="type">GimpDrawable</span></a> the new region will be attached to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the top-left pixel of the region in the
<em class="parameter"><code>drawable</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the top-left pixel of the region in the
<em class="parameter"><code>drawable</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the width of the region.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the height of the region.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dirty</code></em> :</span></p></td>
<td>a <span class="type">gboolean</span> indicating whether the <em class="parameter"><code>drawable</code></em> should be marked
as "dirty".</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>shadow</code></em> :</span></p></td>
<td>a <span class="type">gboolean</span> indicating whether the region is attached to the
shadow tiles or the real <em class="parameter"><code>drawable</code></em> tiles.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-resize"></a><h3>gimp_pixel_rgn_resize ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_resize (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);</pre>
<p>
Change the position and size of a previously initialized pixel region.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</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 the new position of the region's
top-left corner.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the new position of the region's
top-left corner.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the new width of the region.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the new height of the region.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-get-pixel"></a><h3>gimp_pixel_rgn_get_pixel ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_get_pixel (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>);</pre>
<p>
Fill the buffer pointed by <em class="parameter"><code>buf</code></em> with the value of the pixel at (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>)
in the region <em class="parameter"><code>pr</code></em>. <em class="parameter"><code>buf</code></em> should be large enough to hold the pixel value
(1 <span class="type">guchar</span> for an indexed or grayscale drawable, 2 <span class="type">guchar</span> for
indexed with alpha or grayscale with alpha drawable, 3 <span class="type">guchar</span> for
rgb drawable and 4 <span class="type">guchar</span> for rgb with alpha drawable.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a pointer to an array of <span class="type">guchar</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the wanted pixel (relative to the drawable)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the wanted pixel (relative to the drawable)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-get-row"></a><h3>gimp_pixel_rgn_get_row ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_get_row (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>);</pre>
<p>
Get several pixels of a region in a row. This function fills the buffer
<em class="parameter"><code>buf</code></em> with the values of the pixels from (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>) to (<em class="parameter"><code>x</code></em>+<em class="parameter"><code>width</code></em>-1, <em class="parameter"><code>y</code></em>).
<em class="parameter"><code>buf</code></em> should be large enough to hold all these values.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a pointer to an array of <span class="type">guchar</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the number of pixels to get.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-get-col"></a><h3>gimp_pixel_rgn_get_col ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_get_col (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);</pre>
<p>
Get several pixels of a region's column. This function fills the buffer
<em class="parameter"><code>buf</code></em> with the values of the pixels from (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>) to (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>+<em class="parameter"><code>height</code></em>-1).
<em class="parameter"><code>buf</code></em> should be large enough to hold all these values.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a pointer to an array of <span class="type">guchar</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the number of pixels to get.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-get-rect"></a><h3>gimp_pixel_rgn_get_rect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_get_rect (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code><span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);</pre>
<p>
Get all the pixel values from the rectangle defined by <em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>, <em class="parameter"><code>width</code></em> and
<em class="parameter"><code>height</code></em>. This function fills the buffer <em class="parameter"><code>buf</code></em> with the values of the pixels
from (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>) to (<em class="parameter"><code>x</code></em>+<em class="parameter"><code>width</code></em>-1, <em class="parameter"><code>y</code></em>+<em class="parameter"><code>height</code></em>-1).
<em class="parameter"><code>buf</code></em> should be large enough to hold all these values (<em class="parameter"><code>width</code></em>*<em class="parameter"><code>height</code></em>*bpp).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a pointer to an array of <span class="type">guchar</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the width of the rectangle.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the height of the rectangle.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-set-pixel"></a><h3>gimp_pixel_rgn_set_pixel ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_set_pixel (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code>const <span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>);</pre>
<p>
Set the pixel at (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>) to the values from <em class="parameter"><code>buf</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>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a pointer to an array of <span class="type">guchar</span>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the pixel (relative to the drawable).</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-set-row"></a><h3>gimp_pixel_rgn_set_row ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_set_row (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code>const <span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>);</pre>
<p>
Set several pixels of a region in a row. This function draws the pixels
from (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>) to (<em class="parameter"><code>x</code></em>+<em class="parameter"><code>width</code></em>-1, <em class="parameter"><code>y</code></em>) using the values of the buffer <em class="parameter"><code>buf</code></em>.
<em class="parameter"><code>buf</code></em> should be large enough to hold all these values.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a pointer to an array of <span class="type">guchar</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the number of pixels to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-set-col"></a><h3>gimp_pixel_rgn_set_col ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_set_col (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code>const <span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);</pre>
<p>
Set several pixels of a region's column. This function draws the pixels
from (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>) to (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>+<em class="parameter"><code>height</code></em>-1) using the values from the buffer <em class="parameter"><code>buf</code></em>.
<em class="parameter"><code>buf</code></em> should be large enough to hold all these values.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a pointer to an array of <span class="type">guchar</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the number of pixels to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgn-set-rect"></a><h3>gimp_pixel_rgn_set_rect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gimp_pixel_rgn_set_rect (<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> *pr</code></em>,
<em class="parameter"><code>const <span class="type">guchar</span> *buf</code></em>,
<em class="parameter"><code><span class="type">gint</span> x</code></em>,
<em class="parameter"><code><span class="type">gint</span> y</code></em>,
<em class="parameter"><code><span class="type">gint</span> width</code></em>,
<em class="parameter"><code><span class="type">gint</span> height</code></em>);</pre>
<p>
Set all the pixel of the rectangle defined by <em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>, <em class="parameter"><code>width</code></em> and
<em class="parameter"><code>height</code></em>. This function draws the rectangle from (<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em>) to
(<em class="parameter"><code>x</code></em>+<em class="parameter"><code>width</code></em>-1, <em class="parameter"><code>y</code></em>+<em class="parameter"><code>height</code></em>-1), using the pixel values from the buffer <em class="parameter"><code>buf</code></em>.
<em class="parameter"><code>buf</code></em> should be large enough to hold all these values (<em class="parameter"><code>width</code></em>*<em class="parameter"><code>height</code></em>*bpp).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pr</code></em> :</span></p></td>
<td>a pointer to a previously initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>a pointer to an array of <span class="type">guchar</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>the x coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>the y coordinate of the first pixel (relative to the drawable).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the width of the rectangle.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the height of the rectangle.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgns-register"></a><h3>gimp_pixel_rgns_register ()</h3>
<pre class="programlisting"><span class="returnvalue">gpointer</span> gimp_pixel_rgns_register (<em class="parameter"><code><span class="type">gint</span> nrgns</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
This is the varargs version of <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgns-register2" title="gimp_pixel_rgns_register2 ()"><span class="type">gimp_pixel_rgns_register2</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>nrgns</code></em> :</span></p></td>
<td>the number of regions to register.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <span class="type">gpointer</span> to a regions iterator.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgns-register2"></a><h3>gimp_pixel_rgns_register2 ()</h3>
<pre class="programlisting"><span class="returnvalue">gpointer</span> gimp_pixel_rgns_register2 (<em class="parameter"><code><span class="type">gint</span> nrgns</code></em>,
<em class="parameter"><code><a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a> **prs</code></em>);</pre>
<p>
It takes a number of initialized regions of the same size and provides a
pixel region iterator the iterator can be used to iterate over the
registered pixel regions. While iterating the registered pixel regions will
cover subsets of the original pixel regions, chosen for optimized access to
the image data.
</p>
<p>
Note that the given regions themselves are changed by this function, so
they are resized to the first subsets.
</p>
<p>
This function has to be used together with gimp_pixel_rgns_process in a loop.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>nrgns</code></em> :</span></p></td>
<td>the number of regions to register.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prs</code></em> :</span></p></td>
<td>an array of <em class="parameter"><code>nrgns</code></em> pointers to initialized <a class="link" href="libgimp-gimppixelrgn.html#GimpPixelRgn" title="GimpPixelRgn"><span class="type">GimpPixelRgn</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <span class="type">gpointer</span> to a regions iterator.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixel-rgns-process"></a><h3>gimp_pixel_rgns_process ()</h3>
<pre class="programlisting"><span class="returnvalue">gpointer</span> gimp_pixel_rgns_process (<em class="parameter"><code><span class="type">gpointer</span> pri_ptr</code></em>);</pre>
<p>
This function update the regions registered previously with one of the
<a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgns-register" title="gimp_pixel_rgns_register ()"><span class="type">gimp_pixel_rgns_register</span></a>* functions to their next tile.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pri_ptr</code></em> :</span></p></td>
<td>a regions iterator returned by <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgns-register" title="gimp_pixel_rgns_register ()"><span class="type">gimp_pixel_rgns_register</span></a>,
<a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgns-register2" title="gimp_pixel_rgns_register2 ()"><span class="type">gimp_pixel_rgns_register2</span></a> or <a class="link" href="libgimp-gimppixelrgn.html#gimp-pixel-rgns-process" title="gimp_pixel_rgns_process ()"><span class="type">gimp_pixel_rgns_process</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <span class="type">gpointer</span> to a new regions iterator or <span class="type">NULL</span> if there isn't
any tiles left.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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