1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>drm_rect_rotate_inv</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux DRM Developer's Guide"><link rel="up" href="ch02s05.html#idp1126612844" title="Rectangle Utilities Reference"><link rel="prev" href="API-drm-rect-rotate.html" title="drm_rect_rotate"><link rel="next" href="API-struct-drm-flip-task.html" title="struct drm_flip_task"></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"><span class="phrase">drm_rect_rotate_inv</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-drm-rect-rotate.html">Prev</a>&#160;</td><th width="60%" align="center">Rectangle Utilities Reference</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-struct-drm-flip-task.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-drm-rect-rotate-inv"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>drm_rect_rotate_inv &#8212; 
2     Inverse rotate the rectangle
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <b class="fsfunc">drm_rect_rotate_inv </b>(</code></td><td>struct drm_rect * <var class="pdparam">r</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">width</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">height</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">rotation</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1126796556"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>r</code></em></span></dt><dd><p>
4     rectangle to be rotated
5    </p></dd><dt><span class="term"><em class="parameter"><code>width</code></em></span></dt><dd><p>
6     Width of the coordinate space
7    </p></dd><dt><span class="term"><em class="parameter"><code>height</code></em></span></dt><dd><p>
8     Height of the coordinate space
9    </p></dd><dt><span class="term"><em class="parameter"><code>rotation</code></em></span></dt><dd><p>
10     Transformation whose inverse is to be applied
11    </p></dd></dl></div></div><div class="refsect1"><a name="idp1126801268"></a><h2>Description</h2><p>
12   Apply the inverse of <em class="parameter"><code>rotation</code></em> to the coordinates
13   of rectangle <em class="parameter"><code>r</code></em>.
14   </p><p>
15
16   <em class="parameter"><code>width</code></em> and <em class="parameter"><code>height</code></em> combined with <em class="parameter"><code>rotation</code></em> define
17   the location of the new origin.
18   </p><p>
19
20   <em class="parameter"><code>width</code></em> correcsponds to the horizontal and <em class="parameter"><code>height</code></em>
21   to the vertical axis of the original untransformed
22   coordinate space, so that you never have to flip
23   them when doing a rotatation and its inverse.
24   That is, if you do:
25   </p><p>
26
27   drm_rotate(<span class="structname">r</span>, width, height, rotation);
28   drm_rotate_inv(<span class="structname">r</span>, width, height, rotation);
29   </p><p>
30
31   you will always get back the original rectangle.
32</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-drm-rect-rotate.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch02s05.html#idp1126612844">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-struct-drm-flip-task.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">drm_rect_rotate</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">struct drm_flip_task</span></td></tr></table></div></body></html>
33