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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>lqr_carver_rigmask_add</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="The Liquid Rescale library Manual"><link rel="up" href="ref-rigmask.html" title="Rigidity masks"><link rel="prev" href="ref-rigmask.html" title="Rigidity masks"><link rel="next" href="ref-lqr-carver-rigmask-clear.html" title="lqr_carver_rigmask_clear"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><code class="function">lqr_carver_rigmask_add</code></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ref-rigmask.html">Prev</a> </td><th width="60%" align="center">Rigidity masks</th><td width="20%" align="right"> <a accesskey="n" href="ref-lqr-carver-rigmask-clear.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="ref-lqr-carver-rigmask-add"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>lqr_carver_rigmask_add_xy, lqr_carver_rigmask_add_area, lqr_carver_rigmask_add, lqr_carver_rigmask_add_rgb_area, lqr_carver_rigmask_add_rgb — update an <code class="classname">LqrCarver</code> rigidity mask</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <lqr.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">LqrRetVal <b class="fsfunc">lqr_carver_rigmask_add_xy</b>(</code></td><td>LqrCarver* <var class="pdparam">carver</var>, </td></tr><tr><td> </td><td>gdouble <var class="pdparam">rigidity</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">x</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">y</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">LqrRetVal <b class="fsfunc">lqr_carver_rigmask_add_area</b>(</code></td><td>LqrCarver* <var class="pdparam">carver</var>, </td></tr><tr><td> </td><td>gdouble* <var class="pdparam">buffer</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">width</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">height</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">x_off</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">y_off</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">LqrRetVal <b class="fsfunc">lqr_carver_rigmask_add</b>(</code></td><td>LqrCarver* <var class="pdparam">carver</var>, </td></tr><tr><td> </td><td>gdouble* <var class="pdparam">buffer</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">LqrRetVal <b class="fsfunc">lqr_carver_rigmask_add_area</b>(</code></td><td>LqrCarver* <var class="pdparam">carver</var>, </td></tr><tr><td> </td><td>gdouble* <var class="pdparam">buffer</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">channels</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">width</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">height</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">x_off</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">y_off</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">LqrRetVal <b class="fsfunc">lqr_carver_rigmask_add_rgb</b>(</code></td><td>LqrCarver* <var class="pdparam">carver</var>, </td></tr><tr><td> </td><td>gdouble* <var class="pdparam">buffer</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">channels</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm5037"></a><h2>Foreword</h2><p>
All the functions described in this page are used to add a rigidity mask to <code class="classname">LqrCarver</code> objects.
Whenever one of these functions is called, a rigidity mask is activated for the whole image; the
mask contains coefficients which modulate the value of the rigidity (which is set with
<a class="xref" href="ref-lqr-carver-init.html" title="lqr_carver_init"><span class="refentrytitle"><code class="function">lqr_carver_init</code></span>(3)</a>) in different areas of the image.
</p><p>
It is very important to note that using no rigidity masks at all is equivalent to use a rigidity
mask over the whole image with all the values set to <code class="literal">1.0</code>, but, when first
adding a rigidity mask to a <code class="classname">LqrCarver</code> object, all the pixels outside the affected area will
have their rigidity set to zero; therefore, the functions
<code class="function">lqr_carver_rigmask_add_xy</code>, <code class="function">lqr_carver_rigmask_add_area</code>
and <code class="function">lqr_carver_rigmask_add_rgb_area</code> actually affect the whole image,
despite their name.
</p><p>
All the functions must be called after <code class="function">lqr_carver_init</code> and before
<code class="function">lqr_carver_resize</code>. If called multiple times over the same area, new values
will replace the old ones.
</p></div><div class="refsect1"><a name="idm5051"></a><h2>Setting the rigidity mask pixel by pixel</h2><p>
The function <code class="function">lqr_carver_rigmask_add_xy</code> sets the rigidity mask value of the
<em class="parameter"><code>x</code></em>, <em class="parameter"><code>y</code></em> pixel of the image loaded into the <code class="classname">LqrCarver</code> object pointed to by
<em class="parameter"><code>carver</code></em>
</p></div><div class="refsect1"><a name="idm5059"></a><h2>Setting the rigidity mask from a buffer</h2><p>
The function <code class="function">lqr_carver_rigmask_add_area</code> adds a rigidity mask to an area of
the image loaded in the <code class="classname">LqrCarver</code> object pointed to by <em class="parameter"><code>carver</code></em>.
</p><p>
The parameter <em class="parameter"><code>buffer</code></em> must point to an array of <span class="type">doubles</span> of
size <code class="literal"><em class="parameter"><code>width</code></em> * <em class="parameter"><code>height</code></em></code>, ordered
first by rows, then by columns.
</p><p>
The offset of the area relative to the image are specified through <em class="parameter"><code>x_off</code></em>
and <em class="parameter"><code>y_off</code></em>. The rigidity mask area can exceed the boundary of the image,
and the offsets can be negative.
</p><p>
The values in the given <em class="parameter"><code>buffer</code></em> are scaled by the overall
<em class="parameter"><code>rigidity</code></em> value set when calling the function
<code class="function">lqr_carver_init</code>.
</p><p>
The function <code class="function">lqr_carver_rigmask_add</code> can be used when the area to add is of
the same size of the image loaded in the <code class="classname">LqrCarver</code> object and the offsets are
<code class="literal">0</code>.
</p></div><div class="refsect1"><a name="idm5082"></a><h2>Setting the rigidity mask from an image</h2><p>
The functions <code class="function">lqr_carver_rigmask_add_rgb_area</code> and
<code class="function">lqr_carver_rigmask_add_rgb</code> are very similar to
<code class="function">lqr_carver_rigmask_add_area</code> and
<code class="function">lqr_carver_rigmask_add</code>, but use 8-bit multi-channel images as inputs.
</p><p>
The number of channels in the image is passed via the parameter <em class="parameter"><code>channels</code></em>.
The last channel is assumed to be the alpha (opacity) channel if <em class="parameter"><code>channels</code></em>
is equal to <code class="literal">2</code> or greater than <code class="literal">3</code> (if this is not the case,
use the previous functions).
</p><p>
The rigidity value is computed from the average of the colour channels, multiplied by the value
of the alpha channel if present. For example, in RGBA images a white, nontransparent pixel is
equivalent to a value of <code class="literal">1.0</code> when using a buffer in
<code class="function">lqr_carver_rigmask_add_area</code>.
</p></div><div class="refsect1"><a name="idm5097"></a><h2>Return value</h2><p>
The return values follow the Liquid Rescale library signalling system.
</p></div><div class="refsect1"><a name="idm5100"></a><h2>See also</h2><p>
<span class="simplelist"><a class="xref" href="ref-lqr-ret-val.html" title="LqrRetVal"><span class="refentrytitle"><span class="type">LqrRetVal</span></span>(3)</a>, <a class="xref" href="ref-lqr-carver-init.html" title="lqr_carver_init"><span class="refentrytitle"><code class="function">lqr_carver_init</code></span>(3)</a>, <a class="xref" href="ref-lqr-carver-bias-add.html" title="lqr_carver_bias_add"><span class="refentrytitle"><code class="function">lqr_carver_bias_add</code></span>(3)</a></span>
</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ref-rigmask.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ref-rigmask.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ref-lqr-carver-rigmask-clear.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Rigidity masks </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <code class="function">lqr_carver_rigmask_clear</code></td></tr></table></div></body></html>
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