libs/gil/doc/html/reference/group___channel_multiply_algorithm.html

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  46 <div class="title">channel_multiply<div class="ingroups"><a class="el" href="group___channel.html">Channel</a> &raquo; <a class="el" href="group___channel_algorithm.html">Algorithms and Utility Functions</a></div></div>  </div>
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  49
  50 <p>Multiplying unsigned channel values of the same type. Performs scaled multiplication result = a * b / max_value.
  51 <a href="#details">More...</a></p>
  52 <table class="memberdecls">
  53 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
  54 Classes</h2></td></tr>
  55 <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1gil_1_1channel__multiplier__unsigned.html">channel_multiplier_unsigned&lt; ChannelValue &gt;</a></td></tr>
  56 <tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">This is the default implementation. Performance specializatons are provided.  <a href="structboost_1_1gil_1_1channel__multiplier__unsigned.html#details">More...</a><br /></td></tr>
  57 <tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
  58 <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01uint8__t_01_4.html">channel_multiplier_unsigned&lt; uint8_t &gt;</a></td></tr>
  59 <tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Specialization of channel_multiply for 8-bit unsigned channels.  <a href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01uint8__t_01_4.html#details">More...</a><br /></td></tr>
  60 <tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
  61 <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01uint16__t_01_4.html">channel_multiplier_unsigned&lt; uint16_t &gt;</a></td></tr>
  62 <tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Specialization of channel_multiply for 16-bit unsigned channels.  <a href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01uint16__t_01_4.html#details">More...</a><br /></td></tr>
  63 <tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
  64 <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01float32__t_01_4.html">channel_multiplier_unsigned&lt; float32_t &gt;</a></td></tr>
  65 <tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Specialization of channel_multiply for float 0..1 channels.  <a href="structboost_1_1gil_1_1channel__multiplier__unsigned_3_01float32__t_01_4.html#details">More...</a><br /></td></tr>
  66 <tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
  67 <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1gil_1_1channel__multiplier.html">channel_multiplier&lt; ChannelValue &gt;</a></td></tr>
  68 <tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">A function object to multiply two channels. result = a * b / max_value.  <a href="structboost_1_1gil_1_1channel__multiplier.html#details">More...</a><br /></td></tr>
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  72 Functions</h2></td></tr>
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  74 template&lt;typename Channel &gt; </td></tr>
  75 <tr class="memitem:ga0af81efbbb77846afe2570f242d2b974"><td class="memTemplItemLeft" align="right" valign="top">channel_traits&lt; Channel &gt;::value_type&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">channel_multiply</a> (Channel a, Channel b)</td></tr>
  76 <tr class="memdesc:ga0af81efbbb77846afe2570f242d2b974"><td class="mdescLeft">&#160;</td><td class="mdescRight">A function multiplying two channels. result = a * b / max_value. <br /></td></tr>
  77 <tr class="separator:ga0af81efbbb77846afe2570f242d2b974"><td class="memSeparator" colspan="2">&#160;</td></tr>
  78 </table>
  79 <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
  80 <p>Multiplying unsigned channel values of the same type. Performs scaled multiplication result = a * b / max_value. </p>
  81 <p>Example: </p><div class="fragment"><div class="line">uint8_t x=128;</div><div class="line">uint8_t y=128;</div><div class="line">uint8_t mul = <a class="code" href="group___channel_multiply_algorithm.html#ga0af81efbbb77846afe2570f242d2b974">channel_multiply</a>(x,y);</div><div class="line">assert(mul == 64);    <span class="comment">// 64 = 128 * 128 / 255</span></div></div><!-- fragment --> </div><!-- contents -->
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