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Edit File: ref-lqr-vmap-new.html
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>lqr_vmap_new</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-vmaps.html" title="Visibiliy maps"><link rel="prev" href="ref-vmaps.html" title="Visibiliy maps"><link rel="next" href="ref-lqr-vmap-destroy.html" title="lqr_vmap_destroy"></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_vmap_new</code></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ref-vmaps.html">Prev</a> </td><th width="60%" align="center">Visibiliy maps</th><td width="20%" align="right"> <a accesskey="n" href="ref-lqr-vmap-destroy.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="ref-lqr-vmap-new"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>lqr_vmap_new — the <code class="classname">LqrVMap</code> object constructor</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">LqrVMap* <b class="fsfunc">lqr_vmap_new</b>(</code></td><td>gint* <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">depth</var>, </td></tr><tr><td> </td><td>gint <var class="pdparam">orientation</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm3621"></a><h2>Description</h2><p> The function <code class="function">lqr_vmap_new</code> is the constructor for <code class="classname">LqrVMap</code> objects. It can be used to convert saved data in a format which can be loaded in an <code class="classname">LqrCarver</code> object. </p><p> The parameter <em class="parameter"><code>buffer</code></em> must point to an an array of <code class="literal"><em class="parameter"><code>width</code></em> * <em class="parameter"><code>height</code></em></code> <span class="type">int</span>s holding the visibility information. </p><p> The parameter <em class="parameter"><code>depth</code></em> represents the maximum possible amount of rescaling with the given map. </p><p> The parameter <em class="parameter"><code>orientation</code></em> must be <code class="literal">0</code> if the map is to be used for horizontal rescaling, <code class="literal">1</code> if it is to be used for vertical rescaling. </p></div><div class="refsect1"><a name="idm3639"></a><h2>Visibility maps format</h2><p> The <em class="parameter"><code>buffer</code></em> must be an array of integers of size <code class="literal"><em class="parameter"><code>width</code></em> * <em class="parameter"><code>height</code></em></code>. For an horizontally oriented visibility map, the format is as such: each row must contain all values between 1 and <em class="parameter"><code>depth</code></em> (included) exactly once, with low values indicating the pixels which will be operated on first during rescaling. All other pixels must be 0, which means that they won't be affected by rescaling. Such a map allows for horizontal rescaling in the range from <code class="literal"><em class="parameter"><code>width</code></em> - <em class="parameter"><code>depth</code></em></code> to <code class="literal"><em class="parameter"><code>width</code></em> + <em class="parameter"><code>depth</code></em></code>. The same applies to vertically oriented visibility maps, with columns in place of rows and <em class="parameter"><code>height</code></em> in place of <em class="parameter"><code>width</code></em>. </p></div><div class="refsect1"><a name="idm3655"></a><h2>Return value</h2><p> The function returns the newly created <code class="classname">LqrVMap</code> if successful, or <code class="literal"><span class="returnvalue">NULL</span></code> in case of insufficient memory. </p></div><div class="refsect1"><a name="idm3661"></a><h2>See also</h2><p> <span class="simplelist"><a class="xref" href="ref-lqr-vmap-destroy.html" title="lqr_vmap_destroy"><span class="refentrytitle"><code class="function">lqr_vmap_destroy</code></span>(3)</a>, <a class="xref" href="ref-lqr-vmap-load.html" title="lqr_vmap_load"><span class="refentrytitle"><code class="function">lqr_vmap_load</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-vmaps.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ref-vmaps.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ref-lqr-vmap-destroy.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Visibiliy maps </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_vmap_destroy</code></td></tr></table></div></body></html>
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