projects / ceph.git / blame
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1 | <!-- Copyright 2008 Lubomir Bourdev and Hailin Jin |
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| 21 | <head> | |
| 22 | <TITLE>Generic Image Library: kth_semantic_element_type, kth_semantic_element_reference_type, kth_semantic_element_const_reference_type, semantic_at_c</TITLE> | |
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| 37 | <!-- Generated by Doxygen 1.5.6 --> | |
| 38 | <div class="contents"> | |
| 39 | <h1>kth_semantic_element_type, kth_semantic_element_reference_type, kth_semantic_element_const_reference_type, semantic_at_c<br> | |
| 40 | <small> | |
| 41 | [<a class="el" href="g_i_l_0105.html">Algorithms and Utility Functions</a>]</small> | |
| 42 | </h1><hr><a name="_details"></a><h2>Detailed Description</h2> | |
| 43 | Support for accessing the elements of a color base by semantic index. | |
| 44 | <p> | |
| 45 | semantic_at_c: Semantic channel accessors<p> | |
| 46 | The semantic index of an element is the index of its color in the color space. Semantic indexing allows for proper pairing of elements of color bases independent on their <a class="el" href="g_i_l_0567.html" title="Represents a color space and ordering of channels in memory.">layout</a>. For example, red is the first semantic element of a color base regardless of whether it has an RGB <a class="el" href="g_i_l_0567.html" title="Represents a color space and ordering of channels in memory.">layout</a> or a BGR <a class="el" href="g_i_l_0567.html" title="Represents a color space and ordering of channels in memory.">layout</a>. All GIL color base algorithms taking multiple color bases use semantic indexing to access their elements.<p> | |
| 47 | Example: <div class="fragment"><pre class="fragment"><span class="comment">// 16-bit BGR pixel, 4 bits for the blue, 3 bits for the green, 2 bits for the red channel and 7 unused bits</span> | |
| 48 | <span class="keyword">typedef</span> packed_pixel_type<uint16_t, mpl::vector3_c<unsigned,4,3,2>, bgr_layout_t>::type bgr432_pixel_t; | |
| 49 | ||
| 50 | <span class="comment">// A reference to its red channel. Although the red channel is the third, its semantic index is 0 in the RGB color space</span> | |
| 51 | <span class="keyword">typedef</span> kth_semantic_element_reference_type<bgr432_pixel_t, 0>::type red_channel_reference_t; | |
| 52 | ||
| 53 | <span class="comment">// Initialize the pixel to black</span> | |
| 54 | bgr432_pixel_t red_pixel(0,0,0); | |
| 55 | ||
| 56 | <span class="comment">// Set the red channel to 100%</span> | |
| 57 | red_channel_reference_t red_channel = semantic_at_c<0>(red_pixel); | |
| 58 | red_channel = channel_traits<red_channel_reference_t>::max_value(); | |
| 59 | </pre></div> | |
| 60 | <p> | |
| 61 | <table border="0" cellpadding="0" cellspacing="0"> | |
| 62 | <tr><td></td></tr> | |
| 63 | <tr><td colspan="2"><br><h2>Classes</h2></td></tr> | |
| 64 | <tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="g_i_l_0565.html">kth_semantic_element_type</a></td></tr> | |
| 65 | ||
| 66 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Specifies the type of the K-th semantic element of a color base. <a href="g_i_l_0565.html#_details">More...</a><br></td></tr> | |
| 67 | <tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="g_i_l_0563.html">kth_semantic_element_reference_type</a></td></tr> | |
| 68 | ||
| 69 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Specifies the return type of the mutable semantic_at_c<K>(color_base);. <a href="g_i_l_0563.html#_details">More...</a><br></td></tr> | |
| 70 | <tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="g_i_l_0561.html">kth_semantic_element_const_reference_type</a></td></tr> | |
| 71 | ||
| 72 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Specifies the return type of the constant semantic_at_c<K>(color_base);. <a href="g_i_l_0561.html#_details">More...</a><br></td></tr> | |
| 73 | <tr><td colspan="2"><br><h2>Functions</h2></td></tr> | |
| 74 | <tr><td class="memTemplParams" nowrap colspan="2"><a class="anchor" name="g2cdd9bfd1b27576659b8c79a3a0233de"></a><!-- doxytag: member="ColorBaseAlgorithmSemanticAtC::semantic_at_c" ref="g2cdd9bfd1b27576659b8c79a3a0233de" args="(ColorBase &p)" --> | |
| 75 | template<int K, typename ColorBase> </td></tr> | |
| 76 | <tr><td class="memTemplItemLeft" nowrap align="right" valign="top">disable_if< is_const<br> | |
| 77 | < ColorBase >, typename <br> | |
| 78 | kth_semantic_element_reference_type<br> | |
| 79 | < ColorBase, K >::type >::type </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="g_i_l_0114.html#g2cdd9bfd1b27576659b8c79a3a0233de">semantic_at_c</a> (ColorBase &p)</td></tr> | |
| 80 | ||
| 81 | <tr><td class="mdescLeft"> </td><td class="mdescRight">A mutable accessor to the K-th semantic element of a color base. <br></td></tr> | |
| 82 | <tr><td class="memTemplParams" nowrap colspan="2"><a class="anchor" name="gba9e03ce04fda71e2e840c10325b8b11"></a><!-- doxytag: member="ColorBaseAlgorithmSemanticAtC::semantic_at_c" ref="gba9e03ce04fda71e2e840c10325b8b11" args="(const ColorBase &p)" --> | |
| 83 | template<int K, typename ColorBase> </td></tr> | |
| 84 | <tr><td class="memTemplItemLeft" nowrap align="right" valign="top">kth_semantic_element_const_reference_type<br> | |
| 85 | < ColorBase, K >::type </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="g_i_l_0114.html#gba9e03ce04fda71e2e840c10325b8b11">semantic_at_c</a> (const ColorBase &p)</td></tr> | |
| 86 | ||
| 87 | <tr><td class="mdescLeft"> </td><td class="mdescRight">A constant accessor to the K-th semantic element of a color base. <br></td></tr> | |
| 88 | </table> | |
| 89 | </div> | |
| 90 | <hr size="1"><address style="text-align: right;"><small>Generated on Sat May 2 13:50:17 2009 for Generic Image Library by | |
| 91 | <a href="http://www.doxygen.org/index.html"> | |
| 92 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address> | |
| 93 | </body> | |
| 94 | </html> |