1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>drm_rotation_simplify</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="drm-kms-init.html#idp1123898740" title="KMS API Functions"><link rel="prev" href="API-drm-format-vert-chroma-subsampling.html" title="drm_format_vert_chroma_subsampling"><link rel="next" href="API-drm-mode-config-init.html" title="drm_mode_config_init"></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_rotation_simplify</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-drm-format-vert-chroma-subsampling.html">Prev</a>&#160;</td><th width="60%" align="center">KMS API Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-drm-mode-config-init.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-drm-rotation-simplify"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>drm_rotation_simplify &#8212; 
2     Try to simplify the rotation
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">unsigned int <b class="fsfunc">drm_rotation_simplify </b>(</code></td><td>unsigned int <var class="pdparam">rotation</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">supported_rotations</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124498756"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>rotation</code></em></span></dt><dd><p>
4     Rotation to be simplified
5    </p></dd><dt><span class="term"><em class="parameter"><code>supported_rotations</code></em></span></dt><dd><p>
6     Supported rotations
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124501412"></a><h2>Description</h2><p>
8   Attempt to simplify the rotation to a form that is supported.
9   Eg. if the hardware supports everything except DRM_REFLECT_X
10</p></div><div class="refsect1"><a name="idp1124502140"></a><h2>one could call this function like this</h2><p>
11   </p><p>
12
13   drm_rotation_simplify(rotation, BIT(DRM_ROTATE_0) |
14   BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_180) |
15   BIT(DRM_ROTATE_270) | BIT(DRM_REFLECT_Y));
16   </p><p>
17
18   to eliminate the DRM_ROTATE_X flag. Depending on what kind of
19   transforms the hardware supports, this function may not
20   be able to produce a supported transform, so the caller should
21   check the result afterwards.
22</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-format-vert-chroma-subsampling.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="drm-kms-init.html#idp1123898740">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-drm-mode-config-init.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">drm_format_vert_chroma_subsampling</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">drm_mode_config_init</span></td></tr></table></div></body></html>
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