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22 | <TITLE>Generic Image Library: bit_aligned_pixel_reference</TITLE> | |
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38 | <div class="contents"> | |
39 | <h1>bit_aligned_pixel_reference<br> | |
40 | <small> | |
41 | [<a class="el" href="g_i_l_0206.html">Models</a>]</small> | |
42 | </h1><hr><a name="_details"></a><h2>Detailed Description</h2> | |
43 | A heterogeneous <a class="el" href="g_i_l_0599.html" title="Represents a pixel value (a container of channels). Models: HomogeneousColorBaseValueConcept...">pixel</a> reference used to represent non-byte-aligned pixels. Models <a class="el" href="g_i_l_0346.html" title="Pixel concept - A color base whose elements are channels.">PixelConcept</a>. | |
44 | <p> | |
45 | Example: <div class="fragment"><pre class="fragment"><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> data=0; | |
46 | ||
47 | <span class="comment">// A mutable reference to a 6-bit BGR pixel in "123" format (1 bit for red, 2 bits for green, 3 bits for blue)</span> | |
48 | <span class="keyword">typedef</span> <span class="keyword">const</span> bit_aligned_pixel_reference<unsigned char, mpl::vector3_c<int,1,2,3>, rgb_layout_t, <span class="keyword">true</span>> rgb123_ref_t; | |
49 | ||
50 | <span class="comment">// create the pixel reference at bit offset 2</span> | |
51 | <span class="comment">// (i.e. red = [2], green = [3,4], blue = [5,6,7] bits)</span> | |
52 | rgb123_ref_t ref(&data, 2); | |
53 | <a class="code" href="g_i_l_0106.html#gab1205781ba628ca806c47a51f40f5f6" title="Mutable accessor to the element associated with a given color name.">get_color</a>(ref, red_t()) = 1; | |
54 | assert(data == 0x04); | |
55 | <a class="code" href="g_i_l_0106.html#gab1205781ba628ca806c47a51f40f5f6" title="Mutable accessor to the element associated with a given color name.">get_color</a>(ref, green_t()) = 3; | |
56 | assert(data == 0x1C); | |
57 | <a class="code" href="g_i_l_0106.html#gab1205781ba628ca806c47a51f40f5f6" title="Mutable accessor to the element associated with a given color name.">get_color</a>(ref, blue_t()) = 7; | |
58 | assert(data == 0xFC); | |
59 | </pre></div> | |
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64 | <tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="g_i_l_0403.html">bit_aligned_pixel_reference</a></td></tr> | |
65 | ||
66 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Heterogeneous <a class="el" href="g_i_l_0599.html" title="Represents a pixel value (a container of channels). Models: HomogeneousColorBaseValueConcept...">pixel</a> reference corresponding to non-byte-aligned bit range. Models <a class="el" href="g_i_l_0274.html" title="A color base is a container of color elements (such as channels, channel references...">ColorBaseConcept</a>, <a class="el" href="g_i_l_0346.html" title="Pixel concept - A color base whose elements are channels.">PixelConcept</a>, <a class="el" href="g_i_l_0344.html" title="Concept for all pixel-based GIL constructs, such as pixels, iterators, locators,...">PixelBasedConcept</a>. <a href="g_i_l_0403.html#_details">More...</a><br></td></tr> | |
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