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  22.     <TITLE>Generic Image Library: image_view_factory.hpp Source File</TITLE>
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  38.   <div class="navpath"><a class="el" href="g_i_l_0076.html">boost</a>&nbsp;&raquo&nbsp;<a class="el" href="g_i_l_0079.html">gil</a>
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  40. <div class="contents">
    41. 

  41. <h1>image_view_factory.hpp</h1><a href="g_i_l_0227.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
    42. 

  42. <a name="l00002"></a>00002 <span class="comment">    Copyright 2005-2007 Adobe Systems Incorporated</span>
    43. 

  43. <a name="l00003"></a>00003 <span class="comment">   </span>
    44. 

  44. <a name="l00004"></a>00004 <span class="comment">    Use, modification and distribution are subject to the Boost Software License,</span>
    45. 

  45. <a name="l00005"></a>00005 <span class="comment">    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
    46. 

  46. <a name="l00006"></a>00006 <span class="comment">    http://www.boost.org/LICENSE_1_0.txt).</span>
    47. 

  47. <a name="l00007"></a>00007 <span class="comment"></span>
    48. 

  48. <a name="l00008"></a>00008 <span class="comment">    See http://opensource.adobe.com/gil for most recent version including documentation.</span>
    49. 

  49. <a name="l00009"></a>00009 <span class="comment">*/</span>
    50. 

  50. <a name="l00010"></a>00010 
    51. 

  51. <a name="l00011"></a>00011 <span class="comment">/*************************************************************************************************/</span>
    52. 

  52. <a name="l00012"></a>00012 
    53. 

  53. <a name="l00013"></a>00013 <span class="preprocessor">#ifndef GIL_IMAGE_VIEW_FACTORY_HPP</span>
    54. 

  54. <a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define GIL_IMAGE_VIEW_FACTORY_HPP</span>
    55. 

  55. <a name="l00015"></a>00015 <span class="preprocessor"></span>
    56. 

  56. <a name="l00025"></a>00025 
    57. 

  57. <a name="l00027"></a>00027 <span class="preprocessor">#include &lt;cassert&gt;</span>
    58. 

  58. <a name="l00028"></a>00028 <span class="preprocessor">#include &lt;cstddef&gt;</span>
    59. 

  59. <a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="g_i_l_0094.html" title="GIL configuration file.">gil_config.hpp</a>"</span>
    60. 

  60. <a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="g_i_l_0238.html" title="metafunctions that construct types or return type properties">metafunctions.hpp</a>"</span>
    61. 

  61. <a name="l00031"></a>00031 <span class="preprocessor">#include "<a class="code" href="gray_8hpp.html" title="Support for grayscale color space and variants.">gray.hpp</a>"</span>
    62. 

  62. <a name="l00032"></a>00032 <span class="preprocessor">#include "<a class="code" href="g_i_l_0071.html" title="GIL default color space conversions.">color_convert.hpp</a>"</span>
    63. 

  63. <a name="l00033"></a>00033 
    64. 

  64. <a name="l00037"></a>00037 
    65. 

  65. <a name="l00041"></a>00041 
    66. 

  66. <a name="l00042"></a>00042 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
    67. 

  67. <a name="l00043"></a>00043 <span class="keyword">struct </span>default_color_converter;
    68. 

  68. <a name="l00044"></a>00044 
    69. 

  69. <a name="l00045"></a>00045 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">struct </span>dynamic_x_step_type;
    70. 

  70. <a name="l00046"></a>00046 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">struct </span>dynamic_y_step_type;
    71. 

  71. <a name="l00047"></a>00047 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt; <span class="keyword">struct </span>transposed_type;
    72. 

  72. <a name="l00048"></a>00048 
    73. 

  73. <a name="l00051"></a>00051 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    74. 

  74. <a name="l00052"></a><a class="code" href="g_i_l_0532.html">00052</a> <span class="keyword">struct </span><a class="code" href="g_i_l_0532.html" title="Returns the type of a view that has a dynamic step along both X and Y.">dynamic_xy_step_type</a> : <span class="keyword">public</span> dynamic_y_step_type&lt;typename dynamic_x_step_type&lt;View&gt;::type&gt; {};
    75. 

  75. <a name="l00053"></a>00053 
    76. 

  76. <a name="l00056"></a>00056 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    77. 

  77. <a name="l00057"></a><a class="code" href="g_i_l_0531.html">00057</a> <span class="keyword">struct </span><a class="code" href="g_i_l_0531.html" title="Returns the type of a transposed view that has a dynamic step along both X and Y...">dynamic_xy_step_transposed_type</a> : <span class="keyword">public</span> <a class="code" href="g_i_l_0532.html" title="Returns the type of a view that has a dynamic step along both X and Y.">dynamic_xy_step_type</a>&lt;typename transposed_type&lt;View&gt;::type&gt; {};
    78. 

  78. <a name="l00058"></a>00058 
    79. 

  79. <a name="l00059"></a>00059 
    80. 

  80. <a name="l00062"></a>00062 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;
    81. 

  81. <a name="l00063"></a>00063 <span class="keyword">typename</span> <a class="code" href="g_i_l_0627.html" title="Given a pixel iterator defining access to pixels along a row, returns the types of...">type_from_x_iterator&lt;Iterator&gt;::view_t</a>
    82. 

  82. <a name="l00064"></a><a class="code" href="g_i_l_0140.html#g258d615c33c66b17c85b018297164df1">00064</a> <a class="code" href="g_i_l_0140.html#g558c29855a5b73404d4d21f22832a624" title="Constructing image views from raw interleaved pixel data.">interleaved_view</a>(std::size_t width, std::size_t height,
    83. 

  83. <a name="l00065"></a>00065                  Iterator pixels, std::ptrdiff_t rowsize_in_bytes) {
    84. 

  84. <a name="l00066"></a>00066     <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0627.html" title="Given a pixel iterator defining access to pixels along a row, returns the types of...">type_from_x_iterator&lt;Iterator&gt;::view_t</a> RView;
    85. 

  85. <a name="l00067"></a>00067     <span class="keywordflow">return</span> RView(width, height, <span class="keyword">typename</span> RView::locator(pixels, rowsize_in_bytes));
    86. 

  86. <a name="l00068"></a>00068 }
    87. 

  87. <a name="l00069"></a>00069 
    88. 

  88. <a name="l00072"></a>00072 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterator&gt;
    89. 

  89. <a name="l00073"></a>00073 <span class="keyword">typename</span> type_from_x_iterator&lt;Iterator&gt;::view_t
    90. 

  90. <a name="l00074"></a><a class="code" href="g_i_l_0140.html#g558c29855a5b73404d4d21f22832a624">00074</a> <a class="code" href="g_i_l_0140.html#g558c29855a5b73404d4d21f22832a624" title="Constructing image views from raw interleaved pixel data.">interleaved_view</a>(<a class="code" href="g_i_l_0060.html" title="2D point both axes of which have the same dimension typeModels: Point2DConcept">point2&lt;std::size_t&gt;</a> dim,
    91. 

  91. <a name="l00075"></a>00075                  Iterator pixels, std::ptrdiff_t rowsize_in_bytes) {
    92. 

  92. <a name="l00076"></a>00076     <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0627.html" title="Given a pixel iterator defining access to pixels along a row, returns the types of...">type_from_x_iterator&lt;Iterator&gt;::view_t</a> RView;
    93. 

  93. <a name="l00077"></a>00077     <span class="keywordflow">return</span> RView(dim, <span class="keyword">typename</span> RView::locator(pixels, rowsize_in_bytes));
    94. 

  94. <a name="l00078"></a>00078 }
    95. 

  95. <a name="l00079"></a>00079 
    96. 

  96. <a name="l00081"></a>00081 <span class="comment">//  interleaved_view_get_raw_data, planar_view_get_raw_data - return pointers to the raw data (the channels) of a basic homogeneous view.</span>
    97. 

  97. <a name="l00083"></a>00083 <span class="comment"></span>
    98. 

  98. <a name="l00084"></a>00084 <span class="keyword">namespace </span>detail {
    99. 

  99. <a name="l00085"></a>00085     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View, <span class="keywordtype">bool</span> IsMutable&gt; <span class="keyword">struct </span>channel_pointer_type_impl;
    100. 

  100. <a name="l00086"></a>00086 
    101. 

  101. <a name="l00087"></a>00087     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>channel_pointer_type_impl&lt;View, true&gt; {
    102. 

  102. <a name="l00088"></a>00088         <span class="keyword">typedef</span>       <span class="keyword">typename</span> channel_type&lt;View&gt;::type* type;
    103. 

  103. <a name="l00089"></a>00089     };
    104. 

  104. <a name="l00090"></a>00090     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>channel_pointer_type_impl&lt;View, false&gt; {
    105. 

  105. <a name="l00091"></a>00091         <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="keyword">typename</span> channel_type&lt;View&gt;::type* type;
    106. 

  106. <a name="l00092"></a>00092     };
    107. 

  107. <a name="l00093"></a>00093 
    108. 

  108. <a name="l00094"></a>00094     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>channel_pointer_type
    109. 

  109. <a name="l00095"></a>00095         : <span class="keyword">public</span> channel_pointer_type_impl&lt;View, view_is_mutable&lt;View&gt;::value&gt; {};
    110. 

  110. <a name="l00096"></a>00096 } <span class="comment">// namespace detail</span>
    111. 

  111. <a name="l00097"></a>00097 
    112. 

  112. <a name="l00100"></a>00100 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> HomogeneousView&gt;
    113. 

  113. <a name="l00101"></a><a class="code" href="g_i_l_0140.html#g01d2b0e1eb77cd5cafb18f4140278918">00101</a> <span class="keyword">typename</span> detail::channel_pointer_type&lt;HomogeneousView&gt;::type <a class="code" href="g_i_l_0140.html#g01d2b0e1eb77cd5cafb18f4140278918" title="Returns C pointer to the the channels of an interleaved homogeneous view.">interleaved_view_get_raw_data</a>(<span class="keyword">const</span> HomogeneousView&amp; <a class="code" href="g_i_l_0135.html#g55e45a15dddfc0d870c2f7fb9739cb2e" title="Returns the non-constant-pixel view of any image. The returned view is any view.">view</a>) {
    114. 

  114. <a name="l00102"></a>00102     BOOST_STATIC_ASSERT((!is_planar&lt;HomogeneousView&gt;::value &amp;&amp; <a class="code" href="g_i_l_0628.html" title="Basic views must be over basic locators.">view_is_basic&lt;HomogeneousView&gt;::value</a>));
    115. 

  115. <a name="l00103"></a>00103     BOOST_STATIC_ASSERT((boost::is_pointer&lt;typename HomogeneousView::x_iterator&gt;::value));
    116. 

  116. <a name="l00104"></a>00104 
    117. 

  117. <a name="l00105"></a>00105     <span class="keywordflow">return</span> &amp;at_c&lt;0&gt;(<a class="code" href="g_i_l_0135.html#g55e45a15dddfc0d870c2f7fb9739cb2e" title="Returns the non-constant-pixel view of any image. The returned view is any view.">view</a>(0,0));
    118. 

  118. <a name="l00106"></a>00106 }
    119. 

  119. <a name="l00107"></a>00107 
    120. 

  120. <a name="l00110"></a>00110 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> HomogeneousView&gt;
    121. 

  121. <a name="l00111"></a><a class="code" href="g_i_l_0140.html#ga696176662e719ef5637c2ed4d9a2035">00111</a> <span class="keyword">typename</span> detail::channel_pointer_type&lt;HomogeneousView&gt;::type <a class="code" href="g_i_l_0140.html#ga696176662e719ef5637c2ed4d9a2035" title="Returns C pointer to the the channels of a given color plane of a planar homogeneous...">planar_view_get_raw_data</a>(<span class="keyword">const</span> HomogeneousView&amp; <a class="code" href="g_i_l_0135.html#g55e45a15dddfc0d870c2f7fb9739cb2e" title="Returns the non-constant-pixel view of any image. The returned view is any view.">view</a>, <span class="keywordtype">int</span> plane_index) {
    122. 

  122. <a name="l00112"></a>00112     BOOST_STATIC_ASSERT((is_planar&lt;HomogeneousView&gt;::value &amp;&amp; <a class="code" href="g_i_l_0628.html" title="Basic views must be over basic locators.">view_is_basic&lt;HomogeneousView&gt;::value</a>));
    123. 

  123. <a name="l00113"></a>00113     <span class="keywordflow">return</span> dynamic_at_c(view.row_begin(0),plane_index);
    124. 

  124. <a name="l00114"></a>00114 }
    125. 

  125. <a name="l00115"></a>00115 
    126. 

  126. <a name="l00116"></a>00116 
    127. 

  127. <a name="l00120"></a>00120 
    128. 

  128. <a name="l00125"></a>00125 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcConstRefP, <span class="keyword">typename</span> DstP, <span class="keyword">typename</span> CC=default_color_converter &gt;        <span class="comment">// const_reference to the source pixel and destination pixel value</span>
    129. 

  129. <a name="l00126"></a><a class="code" href="g_i_l_0022.html">00126</a> <span class="keyword">class </span><a class="code" href="g_i_l_0022.html" title="Function object that given a source pixel, returns it converted to a given color...">color_convert_deref_fn</a> : <span class="keyword">public</span> <a class="code" href="g_i_l_0475.html" title="Helper base class for pixel dereference adaptors.">deref_base</a>&lt;color_convert_deref_fn&lt;SrcConstRefP,DstP,CC&gt;, DstP, DstP, const DstP&amp;, SrcConstRefP, DstP, false&gt; {
    130. 

  130. <a name="l00127"></a>00127 <span class="keyword">private</span>:
    131. 

  131. <a name="l00128"></a>00128     CC _cc;                     <span class="comment">// color-converter</span>
    132. 

  132. <a name="l00129"></a>00129 <span class="keyword">public</span>:
    133. 

  133. <a name="l00130"></a>00130     <a class="code" href="g_i_l_0022.html" title="Function object that given a source pixel, returns it converted to a given color...">color_convert_deref_fn</a>() {}
    134. 

  134. <a name="l00131"></a>00131     <a class="code" href="g_i_l_0022.html" title="Function object that given a source pixel, returns it converted to a given color...">color_convert_deref_fn</a>(CC cc_in) : _cc(cc_in) {}
    135. 

  135. <a name="l00132"></a>00132 
    136. 

  136. <a name="l00133"></a>00133     DstP operator()(SrcConstRefP srcP)<span class="keyword"> const </span>{
    137. 

  137. <a name="l00134"></a>00134         DstP dstP;
    138. 

  138. <a name="l00135"></a>00135         _cc(srcP,dstP);
    139. 

  139. <a name="l00136"></a>00136         <span class="keywordflow">return</span> dstP;
    140. 

  140. <a name="l00137"></a>00137     }
    141. 

  141. <a name="l00138"></a>00138 };
    142. 

  142. <a name="l00139"></a>00139 
    143. 

  143. <a name="l00140"></a>00140 <span class="keyword">namespace </span>detail {
    144. 

  144. <a name="l00141"></a>00141     <span class="comment">// Add color converter upon dereferencing</span>
    145. 

  145. <a name="l00142"></a>00142     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> CC, <span class="keyword">typename</span> DstP, <span class="keyword">typename</span> SrcP&gt;
    146. 

  146. <a name="l00143"></a>00143     <span class="keyword">struct </span>_color_converted_view_type {
    147. 

  147. <a name="l00144"></a>00144     <span class="keyword">private</span>:
    148. 

  148. <a name="l00145"></a>00145         <span class="keyword">typedef</span> <a class="code" href="g_i_l_0022.html" title="Function object that given a source pixel, returns it converted to a given color...">color_convert_deref_fn&lt;typename SrcView::const_t::reference,DstP,CC&gt;</a> deref_t;
    149. 

  149. <a name="l00146"></a>00146         <span class="keyword">typedef</span> <span class="keyword">typename</span> SrcView::template add_deref&lt;deref_t&gt; add_ref_t;
    150. 

  150. <a name="l00147"></a>00147     <span class="keyword">public</span>:
    151. 

  151. <a name="l00148"></a>00148         <span class="keyword">typedef</span> <span class="keyword">typename</span> add_ref_t::type type;
    152. 

  152. <a name="l00149"></a>00149         <span class="keyword">static</span> type make(<span class="keyword">const</span> SrcView&amp; sv,CC cc) {<span class="keywordflow">return</span> add_ref_t::make(sv,deref_t(cc));}
    153. 

  153. <a name="l00150"></a>00150     };
    154. 

  154. <a name="l00151"></a>00151 
    155. 

  155. <a name="l00152"></a>00152     <span class="comment">// If the Src view has the same pixel type as the target, there is no need for color conversion</span>
    156. 

  156. <a name="l00153"></a>00153     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> CC, <span class="keyword">typename</span> DstP&gt;
    157. 

  157. <a name="l00154"></a>00154     <span class="keyword">struct </span>_color_converted_view_type&lt;SrcView,CC,DstP,DstP&gt; {
    158. 

  158. <a name="l00155"></a>00155         <span class="keyword">typedef</span> SrcView type;
    159. 

  159. <a name="l00156"></a>00156         <span class="keyword">static</span> type make(<span class="keyword">const</span> SrcView&amp; sv,CC) {<span class="keywordflow">return</span> sv;}
    160. 

  160. <a name="l00157"></a>00157     };
    161. 

  161. <a name="l00158"></a>00158 } <span class="comment">// namespace detail</span>
    162. 

  162. <a name="l00159"></a>00159 
    163. 

  163. <a name="l00160"></a>00160 
    164. 

  164. <a name="l00163"></a>00163 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstP, <span class="keyword">typename</span> CC=default_color_converter&gt;
    165. 

  165. <a name="l00164"></a><a class="code" href="g_i_l_0434.html">00164</a> <span class="keyword">struct </span><a class="code" href="g_i_l_0434.html" title="Returns the type of a view that does color conversion upon dereferencing its pixels...">color_converted_view_type</a> : <span class="keyword">public</span> detail::_color_converted_view_type&lt;SrcView,
    166. 

  166. <a name="l00165"></a>00165                                                                              CC,
    167. 

  167. <a name="l00166"></a>00166                                                                              DstP,
    168. 

  168. <a name="l00167"></a>00167                                                                              typename SrcView::value_type&gt; {
    169. 

  169. <a name="l00168"></a>00168     GIL_CLASS_REQUIRE(DstP, boost::gil, <a class="code" href="g_i_l_0328.html" title="Pixel concept that allows for changing its channels.">MutablePixelConcept</a>)<span class="comment">//why does it have to be mutable???</span>
    170. 

  170. <a name="l00169"></a>00169 };
    171. 

  171. <a name="l00170"></a>00170 
    172. 

  172. <a name="l00171"></a>00171 
    173. 

  173. <a name="l00174"></a>00174 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> DstP, <span class="keyword">typename</span> View, <span class="keyword">typename</span> CC&gt;
    174. 

  174. <a name="l00175"></a><a class="code" href="g_i_l_0161.html#gb5114cdb6c2a34f6706952f80baf2dfa">00175</a> <span class="keyword">inline</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0434.html" title="Returns the type of a view that does color conversion upon dereferencing its pixels...">color_converted_view_type&lt;View,DstP,CC&gt;::type</a> <a class="code" href="g_i_l_0161.html#g4e84970128101b572125f025dc81f8e0" title="overload of generic color_converted_view with the default color-converter">color_converted_view</a>(<span class="keyword">const</span> View&amp; src,CC cc) {
    175. 

  175. <a name="l00176"></a>00176     <span class="keywordflow">return</span> <a class="code" href="g_i_l_0434.html" title="Returns the type of a view that does color conversion upon dereferencing its pixels...">color_converted_view_type&lt;View,DstP,CC&gt;::make</a>(src,cc);
    176. 

  176. <a name="l00177"></a>00177 }
    177. 

  177. <a name="l00178"></a>00178 
    178. 

  178. <a name="l00181"></a>00181 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> DstP, <span class="keyword">typename</span> View&gt;
    179. 

  179. <a name="l00182"></a>00182 <span class="keyword">inline</span> <span class="keyword">typename</span> color_converted_view_type&lt;View,DstP&gt;::type
    180. 

  180. <a name="l00183"></a><a class="code" href="g_i_l_0161.html#gf2cd4971200b4e54dd2fda3cb9e24d0f">00183</a> <a class="code" href="g_i_l_0161.html#g4e84970128101b572125f025dc81f8e0" title="overload of generic color_converted_view with the default color-converter">color_converted_view</a>(<span class="keyword">const</span> View&amp; src) {
    181. 

  181. <a name="l00184"></a>00184     <span class="keywordflow">return</span> color_converted_view&lt;DstP&gt;(src,<a class="code" href="g_i_l_0452.html" title="class for color-converting one pixel to another">default_color_converter</a>());
    182. 

  182. <a name="l00185"></a>00185 }
    183. 

  183. <a name="l00186"></a>00186 
    184. 

  184. <a name="l00190"></a>00190 
    185. 

  185. <a name="l00192"></a>00192 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    186. 

  186. <a name="l00193"></a>00193 <span class="keyword">inline</span> <span class="keyword">typename</span> dynamic_y_step_type&lt;View&gt;::type flipped_up_down_view(<span class="keyword">const</span> View&amp; src) { 
    187. 

  187. <a name="l00194"></a>00194     <span class="keyword">typedef</span> <span class="keyword">typename</span> dynamic_y_step_type&lt;View&gt;::type RView;
    188. 

  188. <a name="l00195"></a>00195     <span class="keywordflow">return</span> RView(src.dimensions(),<span class="keyword">typename</span> RView::xy_locator(src.xy_at(0,src.height()-1),-1));
    189. 

  189. <a name="l00196"></a>00196 }
    190. 

  190. <a name="l00197"></a>00197 
    191. 

  191. <a name="l00201"></a>00201 
    192. 

  192. <a name="l00203"></a>00203 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    193. 

  193. <a name="l00204"></a>00204 <span class="keyword">inline</span> <span class="keyword">typename</span> dynamic_x_step_type&lt;View&gt;::type flipped_left_right_view(<span class="keyword">const</span> View&amp; src) {
    194. 

  194. <a name="l00205"></a>00205     <span class="keyword">typedef</span> <span class="keyword">typename</span> dynamic_x_step_type&lt;View&gt;::type RView;
    195. 

  195. <a name="l00206"></a>00206     <span class="keywordflow">return</span> RView(src.dimensions(),<span class="keyword">typename</span> RView::xy_locator(src.xy_at(src.width()-1,0),-1,1));
    196. 

  196. <a name="l00207"></a>00207 }
    197. 

  197. <a name="l00208"></a>00208 
    198. 

  198. <a name="l00212"></a>00212 
    199. 

  199. <a name="l00214"></a>00214 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    200. 

  200. <a name="l00215"></a>00215 <span class="keyword">inline</span> <span class="keyword">typename</span> dynamic_xy_step_transposed_type&lt;View&gt;::type transposed_view(<span class="keyword">const</span> View&amp; src) {
    201. 

  201. <a name="l00216"></a>00216     <span class="keyword">typedef</span> <span class="keyword">typename</span> dynamic_xy_step_transposed_type&lt;View&gt;::type RView;
    202. 

  202. <a name="l00217"></a>00217     <span class="keywordflow">return</span> RView(src.height(),src.width(),<span class="keyword">typename</span> RView::xy_locator(src.xy_at(0,0),1,1,<span class="keyword">true</span>));
    203. 

  203. <a name="l00218"></a>00218 }
    204. 

  204. <a name="l00219"></a>00219 
    205. 

  205. <a name="l00223"></a>00223 
    206. 

  206. <a name="l00225"></a>00225 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    207. 

  207. <a name="l00226"></a>00226 <span class="keyword">inline</span> <span class="keyword">typename</span> dynamic_xy_step_transposed_type&lt;View&gt;::type rotated90cw_view(<span class="keyword">const</span> View&amp; src) {
    208. 

  208. <a name="l00227"></a>00227     <span class="keyword">typedef</span> <span class="keyword">typename</span> dynamic_xy_step_transposed_type&lt;View&gt;::type RView;
    209. 

  209. <a name="l00228"></a>00228     <span class="keywordflow">return</span> RView(src.height(),src.width(),<span class="keyword">typename</span> RView::xy_locator(src.xy_at(0,src.height()-1),-1,1,<span class="keyword">true</span>));
    210. 

  210. <a name="l00229"></a>00229 }
    211. 

  211. <a name="l00230"></a>00230 
    212. 

  212. <a name="l00234"></a>00234 
    213. 

  213. <a name="l00236"></a>00236 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    214. 

  214. <a name="l00237"></a>00237 <span class="keyword">inline</span> <span class="keyword">typename</span> dynamic_xy_step_transposed_type&lt;View&gt;::type rotated90ccw_view(<span class="keyword">const</span> View&amp; src) {
    215. 

  215. <a name="l00238"></a>00238     <span class="keyword">typedef</span> <span class="keyword">typename</span> dynamic_xy_step_transposed_type&lt;View&gt;::type RView;
    216. 

  216. <a name="l00239"></a>00239     <span class="keywordflow">return</span> RView(src.height(),src.width(),<span class="keyword">typename</span> RView::xy_locator(src.xy_at(src.width()-1,0),1,-1,<span class="keyword">true</span>));
    217. 

  217. <a name="l00240"></a>00240 }
    218. 

  218. <a name="l00241"></a>00241 
    219. 

  219. <a name="l00245"></a>00245 
    220. 

  220. <a name="l00247"></a>00247 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    221. 

  221. <a name="l00248"></a>00248 <span class="keyword">inline</span> <span class="keyword">typename</span> dynamic_xy_step_type&lt;View&gt;::type rotated180_view(<span class="keyword">const</span> View&amp; src) {
    222. 

  222. <a name="l00249"></a>00249     <span class="keyword">typedef</span> <span class="keyword">typename</span> dynamic_xy_step_type&lt;View&gt;::type RView;
    223. 

  223. <a name="l00250"></a>00250     <span class="keywordflow">return</span> RView(src.dimensions(),<span class="keyword">typename</span> RView::xy_locator(src.xy_at(src.width()-1,src.height()-1),-1,-1));
    224. 

  224. <a name="l00251"></a>00251 }
    225. 

  225. <a name="l00252"></a>00252 
    226. 

  226. <a name="l00256"></a>00256 
    227. 

  227. <a name="l00258"></a>00258 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    228. 

  228. <a name="l00259"></a>00259 <span class="keyword">inline</span> View subimage_view(<span class="keyword">const</span> View&amp; src, <span class="keyword">const</span> <span class="keyword">typename</span> View::point_t&amp; topleft, <span class="keyword">const</span> <span class="keyword">typename</span> View::point_t&amp; dimensions) {
    229. 

  229. <a name="l00260"></a>00260     <span class="keywordflow">return</span> View(dimensions,src.xy_at(topleft));
    230. 

  230. <a name="l00261"></a>00261 }
    231. 

  231. <a name="l00262"></a>00262 
    232. 

  232. <a name="l00264"></a>00264 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    233. 

  233. <a name="l00265"></a>00265 <span class="keyword">inline</span> View subimage_view(<span class="keyword">const</span> View&amp; src, <span class="keywordtype">int</span> xMin, <span class="keywordtype">int</span> yMin, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height) {
    234. 

  234. <a name="l00266"></a>00266     <span class="keywordflow">return</span> View(width,height,src.xy_at(xMin,yMin));
    235. 

  235. <a name="l00267"></a>00267 }
    236. 

  236. <a name="l00268"></a>00268 
    237. 

  237. <a name="l00272"></a>00272 
    238. 

  238. <a name="l00274"></a>00274 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    239. 

  239. <a name="l00275"></a>00275 <span class="keyword">inline</span> <span class="keyword">typename</span> dynamic_xy_step_type&lt;View&gt;::type subsampled_view(<span class="keyword">const</span> View&amp; src, <span class="keyword">typename</span> View::coord_t xStep, <span class="keyword">typename</span> View::coord_t yStep) {
    240. 

  240. <a name="l00276"></a>00276     assert(xStep&gt;0 &amp;&amp; yStep&gt;0);
    241. 

  241. <a name="l00277"></a>00277     <span class="keyword">typedef</span> <span class="keyword">typename</span> dynamic_xy_step_type&lt;View&gt;::type RView;
    242. 

  242. <a name="l00278"></a>00278     <span class="keywordflow">return</span> RView((src.width()+(xStep-1))/xStep,(src.height()+(yStep-1))/yStep,
    243. 

  243. <a name="l00279"></a>00279                                           <span class="keyword">typename</span> RView::xy_locator(src.xy_at(0,0),xStep,yStep));
    244. 

  244. <a name="l00280"></a>00280 }
    245. 

  245. <a name="l00281"></a>00281 
    246. 

  246. <a name="l00283"></a>00283 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; 
    247. 

  247. <a name="l00284"></a>00284 <span class="keyword">inline</span> <span class="keyword">typename</span> dynamic_xy_step_type&lt;View&gt;::type subsampled_view(<span class="keyword">const</span> View&amp; src, <span class="keyword">const</span> <span class="keyword">typename</span> View::point_t&amp; step) { 
    248. 

  248. <a name="l00285"></a>00285     <span class="keywordflow">return</span> subsampled_view(src,step.x,step.y);
    249. 

  249. <a name="l00286"></a>00286 }
    250. 

  250. <a name="l00287"></a>00287 
    251. 

  251. <a name="l00291"></a>00291 
    252. 

  252. <a name="l00292"></a>00292 <span class="keyword">namespace </span>detail {
    253. 

  253. <a name="l00293"></a>00293     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View, <span class="keywordtype">bool</span> AreChannelsTogether&gt; <span class="keyword">struct </span>__nth_channel_view_basic;
    254. 

  254. <a name="l00294"></a>00294 
    255. 

  255. <a name="l00295"></a>00295     <span class="comment">// nth_channel_view when the channels are not adjacent in memory. This can happen for multi-channel interleaved images </span>
    256. 

  256. <a name="l00296"></a>00296     <span class="comment">// or images with a step</span>
    257. 

  257. <a name="l00297"></a>00297     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    258. 

  258. <a name="l00298"></a>00298     <span class="keyword">struct </span>__nth_channel_view_basic&lt;View,false&gt; {
    259. 

  259. <a name="l00299"></a>00299         <span class="keyword">typedef</span> <span class="keyword">typename</span> view_type&lt;typename channel_type&lt;View&gt;::type, gray_layout_t, <span class="keyword">false</span>, <span class="keyword">true</span>, view_is_mutable&lt;View&gt;::value&gt;::type type;
    260. 

  260. <a name="l00300"></a>00300 
    261. 

  261. <a name="l00301"></a>00301         <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src, <span class="keywordtype">int</span> n) {
    262. 

  262. <a name="l00302"></a>00302             <span class="keyword">typedef</span> <span class="keyword">typename</span> type::xy_locator                             locator_t;
    263. 

  263. <a name="l00303"></a>00303             <span class="keyword">typedef</span> <span class="keyword">typename</span> type::x_iterator                            x_iterator_t;
    264. 

  264. <a name="l00304"></a>00304             <span class="keyword">typedef</span> <span class="keyword">typename</span> iterator_adaptor_get_base&lt;x_iterator_t&gt;::type x_iterator_base_t;
    265. 

  265. <a name="l00305"></a>00305             x_iterator_t sit(x_iterator_base_t(&amp;(src(0,0)[n])),src.pixels().pixel_size());
    266. 

  266. <a name="l00306"></a>00306             <span class="keywordflow">return</span> type(src.dimensions(),locator_t(sit, src.pixels().row_size()));
    267. 

  267. <a name="l00307"></a>00307         }
    268. 

  268. <a name="l00308"></a>00308     };
    269. 

  269. <a name="l00309"></a>00309 
    270. 

  270. <a name="l00310"></a>00310     <span class="comment">// nth_channel_view when the channels are together in memory (true for simple grayscale or planar images)</span>
    271. 

  271. <a name="l00311"></a>00311     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    272. 

  272. <a name="l00312"></a>00312     <span class="keyword">struct </span>__nth_channel_view_basic&lt;View,true&gt; {
    273. 

  273. <a name="l00313"></a>00313         <span class="keyword">typedef</span> <span class="keyword">typename</span> view_type&lt;typename channel_type&lt;View&gt;::type, gray_layout_t, <span class="keyword">false</span>, <span class="keyword">false</span>, view_is_mutable&lt;View&gt;::value&gt;::type type;
    274. 

  274. <a name="l00314"></a>00314         <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src, <span class="keywordtype">int</span> n) {
    275. 

  275. <a name="l00315"></a>00315             <span class="keyword">typedef</span> <span class="keyword">typename</span> type::x_iterator x_iterator_t;
    276. 

  276. <a name="l00316"></a>00316             <span class="keywordflow">return</span> <a class="code" href="g_i_l_0140.html#g558c29855a5b73404d4d21f22832a624" title="Constructing image views from raw interleaved pixel data.">interleaved_view</a>(src.width(),src.height(),(x_iterator_t)&amp;(src(0,0)[n]), src.pixels().row_size());
    277. 

  277. <a name="l00317"></a>00317         }
    278. 

  278. <a name="l00318"></a>00318     };
    279. 

  279. <a name="l00319"></a>00319 
    280. 

  280. <a name="l00320"></a>00320     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View, <span class="keywordtype">bool</span> IsBasic&gt; <span class="keyword">struct </span>__nth_channel_view;
    281. 

  281. <a name="l00321"></a>00321 
    282. 

  282. <a name="l00322"></a>00322     <span class="comment">// For basic (memory-based) views dispatch to __nth_channel_view_basic</span>
    283. 

  283. <a name="l00323"></a>00323     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>__nth_channel_view&lt;View,true&gt; {
    284. 

  284. <a name="l00324"></a>00324     <span class="keyword">private</span>:
    285. 

  285. <a name="l00325"></a>00325         <span class="keyword">typedef</span> <span class="keyword">typename</span> View::x_iterator src_x_iterator;
    286. 

  286. <a name="l00326"></a>00326 
    287. 

  287. <a name="l00327"></a>00327         <span class="comment">// Determines whether the channels of a given pixel iterator are adjacent in memory.</span>
    288. 

  288. <a name="l00328"></a>00328         <span class="comment">// Planar and grayscale iterators have channels adjacent in memory, whereas multi-channel interleaved and iterators with non-fundamental step do not.</span>
    289. 

  289. <a name="l00329"></a>00329         BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>, adjacent=
    290. 

  290. <a name="l00330"></a>00330                               !iterator_is_step&lt;src_x_iterator&gt;::value &amp;&amp;
    291. 

  291. <a name="l00331"></a>00331                               (is_planar&lt;src_x_iterator&gt;::value ||
    292. 

  292. <a name="l00332"></a>00332                               num_channels&lt;View&gt;::value==1));
    293. 

  293. <a name="l00333"></a>00333     <span class="keyword">public</span>:
    294. 

  294. <a name="l00334"></a>00334         <span class="keyword">typedef</span> <span class="keyword">typename</span> __nth_channel_view_basic&lt;View,adjacent&gt;::type type;
    295. 

  295. <a name="l00335"></a>00335 
    296. 

  296. <a name="l00336"></a>00336         <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src, <span class="keywordtype">int</span> n) {
    297. 

  297. <a name="l00337"></a>00337             <span class="keywordflow">return</span> __nth_channel_view_basic&lt;View,adjacent&gt;::make(src,n);
    298. 

  298. <a name="l00338"></a>00338         }
    299. 

  299. <a name="l00339"></a>00339     };
    300. 

  300. <a name="l00340"></a>00340 
    301. 

  301. <a name="l00345"></a>00345     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> SrcP&gt;        <span class="comment">// SrcP is a reference to PixelConcept (could be pixel value or const/non-const reference)</span>
    302. 

  302. <a name="l00346"></a>00346                                     <span class="comment">// Examples: pixel&lt;T,L&gt;, pixel&lt;T,L&gt;&amp;, const pixel&lt;T,L&gt;&amp;, planar_pixel_reference&lt;T&amp;,L&gt;, planar_pixel_reference&lt;const T&amp;,L&gt;</span>
    303. 

  303. <a name="l00347"></a><a class="code" href="g_i_l_0515.html">00347</a>     <span class="keyword">struct </span><a class="code" href="g_i_l_0515.html" title="Function object that returns a grayscale reference of the N-th channel of a given...">nth_channel_deref_fn</a> {
    304. 

  304. <a name="l00348"></a>00348         BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>, is_mutable=<a class="code" href="g_i_l_0600.html" title="Given a model of a pixel, determines whether the model represents a pixel reference...">pixel_is_reference&lt;SrcP&gt;::value</a> &amp;&amp; <a class="code" href="g_i_l_0602.html" title="Determines if the given pixel reference is mutable (i.e. its channels can be changed)...">pixel_reference_is_mutable&lt;SrcP&gt;::value</a>);
    305. 

  305. <a name="l00349"></a>00349     <span class="keyword">private</span>:
    306. 

  306. <a name="l00350"></a>00350         <span class="keyword">typedef</span> <span class="keyword">typename</span> remove_reference&lt;SrcP&gt;::type src_pixel_t;
    307. 

  307. <a name="l00351"></a>00351         <span class="keyword">typedef</span> <span class="keyword">typename</span> channel_type&lt;src_pixel_t&gt;::type channel_t;
    308. 

  308. <a name="l00352"></a>00352         <span class="keyword">typedef</span> <span class="keyword">typename</span> src_pixel_t::const_reference const_ref_t;
    309. 

  309. <a name="l00353"></a>00353         <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0604.html" title="Returns the type of a homogeneous pixel reference given the channel type, layout...">pixel_reference_type&lt;channel_t,gray_layout_t,false,is_mutable&gt;::type</a> ref_t;
    310. 

  310. <a name="l00354"></a>00354     <span class="keyword">public</span>:
    311. 

  311. <a name="l00355"></a>00355         <span class="keyword">typedef</span> <a class="code" href="g_i_l_0515.html" title="Function object that returns a grayscale reference of the N-th channel of a given...">nth_channel_deref_fn&lt;const_ref_t&gt;</a>                                        <a class="code" href="g_i_l_0515.html" title="Function object that returns a grayscale reference of the N-th channel of a given...">const_t</a>;
    312. 

  312. <a name="l00356"></a>00356         <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0606.html" title="Returns the type of a homogeneous pixel given the channel type and layout.">pixel_value_type&lt;channel_t,gray_layout_t&gt;::type</a>                 <a class="code" href="g_i_l_0599.html" title="Represents a pixel value (a container of channels). Models: HomogeneousColorBaseValueConcept...">value_type</a>;
    313. 

  313. <a name="l00357"></a>00357         <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0604.html" title="Returns the type of a homogeneous pixel reference given the channel type, layout...">pixel_reference_type&lt;channel_t,gray_layout_t,false,false&gt;::type</a> const_reference;
    314. 

  314. <a name="l00358"></a>00358         <span class="keyword">typedef</span> SrcP                                                                     argument_type;
    315. 

  315. <a name="l00359"></a>00359         <span class="keyword">typedef</span> <span class="keyword">typename</span> mpl::if_c&lt;is_mutable, ref_t, value_type&gt;::type                  reference;
    316. 

  316. <a name="l00360"></a>00360         <span class="keyword">typedef</span> reference                                                                result_type;
    317. 

  317. <a name="l00361"></a>00361 
    318. 

  318. <a name="l00362"></a>00362         <a class="code" href="g_i_l_0515.html" title="Function object that returns a grayscale reference of the N-th channel of a given...">nth_channel_deref_fn</a>(<span class="keywordtype">int</span> n=0) : _n(n) {}
    319. 

  319. <a name="l00363"></a>00363         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt; <a class="code" href="g_i_l_0515.html" title="Function object that returns a grayscale reference of the N-th channel of a given...">nth_channel_deref_fn</a>(<span class="keyword">const</span> <a class="code" href="g_i_l_0515.html" title="Function object that returns a grayscale reference of the N-th channel of a given...">nth_channel_deref_fn&lt;P&gt;</a>&amp; d) : _n(d.<a class="code" href="g_i_l_0515.html#da0e3adfe5f3db62623fb73a49c120b3">_n</a>) {}
    320. 

  320. <a name="l00364"></a>00364 
    321. 

  321. <a name="l00365"></a>00365         <span class="keywordtype">int</span> _n;        <span class="comment">// the channel to use</span>
    322. 

  322. <a name="l00366"></a>00366 
    323. 

  323. <a name="l00367"></a>00367         result_type operator()(argument_type srcP)<span class="keyword"> const </span>{ 
    324. 

  324. <a name="l00368"></a>00368             <span class="keywordflow">return</span> result_type(srcP[_n]); 
    325. 

  325. <a name="l00369"></a>00369         }
    326. 

  326. <a name="l00370"></a>00370     };
    327. 

  327. <a name="l00371"></a>00371 
    328. 

  328. <a name="l00372"></a>00372     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>__nth_channel_view&lt;View,false&gt; {
    329. 

  329. <a name="l00373"></a>00373     <span class="keyword">private</span>:
    330. 

  330. <a name="l00374"></a>00374         <span class="keyword">typedef</span> <a class="code" href="g_i_l_0515.html" title="Function object that returns a grayscale reference of the N-th channel of a given...">nth_channel_deref_fn&lt;typename View::reference&gt;</a> deref_t;
    331. 

  331. <a name="l00375"></a>00375         <span class="keyword">typedef</span> <span class="keyword">typename</span> View::template add_deref&lt;deref_t&gt;   AD;
    332. 

  332. <a name="l00376"></a>00376     <span class="keyword">public</span>:
    333. 

  333. <a name="l00377"></a>00377         <span class="keyword">typedef</span> <span class="keyword">typename</span> AD::type type;
    334. 

  334. <a name="l00378"></a>00378         <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src, <span class="keywordtype">int</span> n) {
    335. 

  335. <a name="l00379"></a>00379             <span class="keywordflow">return</span> AD::make(src, deref_t(n));
    336. 

  336. <a name="l00380"></a>00380         }
    337. 

  337. <a name="l00381"></a>00381     };
    338. 

  338. <a name="l00382"></a>00382 } <span class="comment">// namespace detail</span>
    339. 

  339. <a name="l00383"></a>00383 
    340. 

  340. <a name="l00390"></a>00390 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    341. 

  341. <a name="l00391"></a><a class="code" href="g_i_l_0578.html">00391</a> <span class="keyword">struct </span><a class="code" href="g_i_l_0578.html" title="Given a source image view type View, returns the type of an image view over a single...">nth_channel_view_type</a> {
    342. 

  342. <a name="l00392"></a>00392 <span class="keyword">private</span>:
    343. 

  343. <a name="l00393"></a>00393     GIL_CLASS_REQUIRE(View, boost::gil, <a class="code" href="g_i_l_0308.html" title="GIL&amp;#39;s 2-dimensional view over immutable GIL pixels.">ImageViewConcept</a>)
    344. 

  344. <a name="l00394"></a>00394     <span class="keyword">typedef</span> detail::__nth_channel_view&lt;View,view_is_basic&lt;View&gt;::value&gt; VB;
    345. 

  345. <a name="l00395"></a>00395 <span class="keyword">public</span>:
    346. 

  346. <a name="l00396"></a>00396     <span class="keyword">typedef</span> <span class="keyword">typename</span> VB::type type;
    347. 

  347. <a name="l00397"></a>00397     <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src, <span class="keywordtype">int</span> n) { <span class="keywordflow">return</span> VB::make(src,n); }
    348. 

  348. <a name="l00398"></a>00398 };
    349. 

  349. <a name="l00399"></a>00399 
    350. 

  350. <a name="l00400"></a>00400 
    351. 

  351. <a name="l00402"></a>00402 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    352. 

  352. <a name="l00403"></a>00403 <span class="keyword">typename</span> <a class="code" href="g_i_l_0578.html" title="Given a source image view type View, returns the type of an image view over a single...">nth_channel_view_type&lt;View&gt;::type</a> nth_channel_view(<span class="keyword">const</span> View&amp; src, <span class="keywordtype">int</span> n) {
    353. 

  353. <a name="l00404"></a>00404     <span class="keywordflow">return</span> <a class="code" href="g_i_l_0578.html" title="Given a source image view type View, returns the type of an image view over a single...">nth_channel_view_type&lt;View&gt;::make</a>(src,n);
    354. 

  354. <a name="l00405"></a>00405 }
    355. 

  355. <a name="l00406"></a>00406 
    356. 

  356. <a name="l00407"></a>00407 
    357. 

  357. <a name="l00408"></a>00408 
    358. 

  358. <a name="l00409"></a>00409 
    359. 

  359. <a name="l00410"></a>00410 
    360. 

  360. <a name="l00411"></a>00411 
    361. 

  361. <a name="l00412"></a>00412 
    362. 

  362. <a name="l00416"></a>00416 
    363. 

  363. <a name="l00417"></a>00417 <span class="keyword">namespace </span>detail {
    364. 

  364. <a name="l00418"></a>00418     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> View, <span class="keywordtype">bool</span> AreChannelsTogether&gt; <span class="keyword">struct </span>__kth_channel_view_basic;
    365. 

  365. <a name="l00419"></a>00419 
    366. 

  366. <a name="l00420"></a>00420     <span class="comment">// kth_channel_view when the channels are not adjacent in memory. This can happen for multi-channel interleaved images </span>
    367. 

  367. <a name="l00421"></a>00421     <span class="comment">// or images with a step</span>
    368. 

  368. <a name="l00422"></a>00422     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> View&gt;
    369. 

  369. <a name="l00423"></a>00423     <span class="keyword">struct </span>__kth_channel_view_basic&lt;K,View,false&gt; {
    370. 

  370. <a name="l00424"></a>00424     <span class="keyword">private</span>:
    371. 

  371. <a name="l00425"></a>00425         <span class="keyword">typedef</span> <span class="keyword">typename</span> kth_element_type&lt;typename View::value_type,K&gt;::type channel_t;
    372. 

  372. <a name="l00426"></a>00426     <span class="keyword">public</span>:
    373. 

  373. <a name="l00427"></a>00427         <span class="keyword">typedef</span> <span class="keyword">typename</span> view_type&lt;channel_t, gray_layout_t, false, true, view_is_mutable&lt;View&gt;::value&gt;::type type;
    374. 

  374. <a name="l00428"></a>00428 
    375. 

  375. <a name="l00429"></a>00429         <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src) {
    376. 

  376. <a name="l00430"></a>00430             <span class="keyword">typedef</span> <span class="keyword">typename</span> type::xy_locator                             locator_t;
    377. 

  377. <a name="l00431"></a>00431             <span class="keyword">typedef</span> <span class="keyword">typename</span> type::x_iterator                            x_iterator_t;
    378. 

  378. <a name="l00432"></a>00432             <span class="keyword">typedef</span> <span class="keyword">typename</span> iterator_adaptor_get_base&lt;x_iterator_t&gt;::type x_iterator_base_t;
    379. 

  379. <a name="l00433"></a>00433             x_iterator_t sit(x_iterator_base_t(&amp;at_c&lt;K&gt;(src(0,0))),src.pixels().pixel_size());
    380. 

  380. <a name="l00434"></a>00434             <span class="keywordflow">return</span> type(src.dimensions(),locator_t(sit, src.pixels().row_size()));
    381. 

  381. <a name="l00435"></a>00435         }
    382. 

  382. <a name="l00436"></a>00436     };
    383. 

  383. <a name="l00437"></a>00437 
    384. 

  384. <a name="l00438"></a>00438     <span class="comment">// kth_channel_view when the channels are together in memory (true for simple grayscale or planar images)</span>
    385. 

  385. <a name="l00439"></a>00439     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> View&gt;
    386. 

  386. <a name="l00440"></a>00440     <span class="keyword">struct </span>__kth_channel_view_basic&lt;K,View,true&gt; {
    387. 

  387. <a name="l00441"></a>00441     <span class="keyword">private</span>:
    388. 

  388. <a name="l00442"></a>00442         <span class="keyword">typedef</span> <span class="keyword">typename</span> kth_element_type&lt;typename View::value_type, K&gt;::type channel_t;
    389. 

  389. <a name="l00443"></a>00443     <span class="keyword">public</span>:
    390. 

  390. <a name="l00444"></a>00444         <span class="keyword">typedef</span> <span class="keyword">typename</span> view_type&lt;channel_t, gray_layout_t, false, false, view_is_mutable&lt;View&gt;::value&gt;::type type;
    391. 

  391. <a name="l00445"></a>00445         <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src) {
    392. 

  392. <a name="l00446"></a>00446             <span class="keyword">typedef</span> <span class="keyword">typename</span> type::x_iterator x_iterator_t;
    393. 

  393. <a name="l00447"></a>00447             <span class="keywordflow">return</span> <a class="code" href="g_i_l_0140.html#g558c29855a5b73404d4d21f22832a624" title="Constructing image views from raw interleaved pixel data.">interleaved_view</a>(src.width(),src.height(),(x_iterator_t)&amp;at_c&lt;K&gt;(src(0,0)), src.pixels().row_size());
    394. 

  394. <a name="l00448"></a>00448         }
    395. 

  395. <a name="l00449"></a>00449     };
    396. 

  396. <a name="l00450"></a>00450 
    397. 

  397. <a name="l00451"></a>00451     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> View, <span class="keywordtype">bool</span> IsBasic&gt; <span class="keyword">struct </span>__kth_channel_view;
    398. 

  398. <a name="l00452"></a>00452 
    399. 

  399. <a name="l00453"></a>00453     <span class="comment">// For basic (memory-based) views dispatch to __kth_channel_view_basic</span>
    400. 

  400. <a name="l00454"></a>00454     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>__kth_channel_view&lt;K,View,true&gt; {
    401. 

  401. <a name="l00455"></a>00455     <span class="keyword">private</span>:
    402. 

  402. <a name="l00456"></a>00456         <span class="keyword">typedef</span> <span class="keyword">typename</span> View::x_iterator src_x_iterator;
    403. 

  403. <a name="l00457"></a>00457 
    404. 

  404. <a name="l00458"></a>00458         <span class="comment">// Determines whether the channels of a given pixel iterator are adjacent in memory.</span>
    405. 

  405. <a name="l00459"></a>00459         <span class="comment">// Planar and grayscale iterators have channels adjacent in memory, whereas multi-channel interleaved and iterators with non-fundamental step do not.</span>
    406. 

  406. <a name="l00460"></a>00460         BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>, adjacent=
    407. 

  407. <a name="l00461"></a>00461                               !iterator_is_step&lt;src_x_iterator&gt;::value &amp;&amp;
    408. 

  408. <a name="l00462"></a>00462                               (is_planar&lt;src_x_iterator&gt;::value ||
    409. 

  409. <a name="l00463"></a>00463                               num_channels&lt;View&gt;::value==1));
    410. 

  410. <a name="l00464"></a>00464     <span class="keyword">public</span>:
    411. 

  411. <a name="l00465"></a>00465         <span class="keyword">typedef</span> <span class="keyword">typename</span> __kth_channel_view_basic&lt;K,View,adjacent&gt;::type type;
    412. 

  412. <a name="l00466"></a>00466 
    413. 

  413. <a name="l00467"></a>00467         <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src) {
    414. 

  414. <a name="l00468"></a>00468             <span class="keywordflow">return</span> __kth_channel_view_basic&lt;K,View,adjacent&gt;::make(src);
    415. 

  415. <a name="l00469"></a>00469         }
    416. 

  416. <a name="l00470"></a>00470     };
    417. 

  417. <a name="l00471"></a>00471 
    418. 

  418. <a name="l00476"></a>00476     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> SrcP&gt;        <span class="comment">// SrcP is a reference to PixelConcept (could be pixel value or const/non-const reference)</span>
    419. 

  419. <a name="l00477"></a>00477                                     <span class="comment">// Examples: pixel&lt;T,L&gt;, pixel&lt;T,L&gt;&amp;, const pixel&lt;T,L&gt;&amp;, planar_pixel_reference&lt;T&amp;,L&gt;, planar_pixel_reference&lt;const T&amp;,L&gt;</span>
    420. 

  420. <a name="l00478"></a><a class="code" href="g_i_l_0513.html">00478</a>     <span class="keyword">struct </span><a class="code" href="g_i_l_0513.html" title="Function object that returns a grayscale reference of the K-th channel (specified...">kth_channel_deref_fn</a> {
    421. 

  421. <a name="l00479"></a>00479         BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>, is_mutable=<a class="code" href="g_i_l_0600.html" title="Given a model of a pixel, determines whether the model represents a pixel reference...">pixel_is_reference&lt;SrcP&gt;::value</a> &amp;&amp; <a class="code" href="g_i_l_0602.html" title="Determines if the given pixel reference is mutable (i.e. its channels can be changed)...">pixel_reference_is_mutable&lt;SrcP&gt;::value</a>);
    422. 

  422. <a name="l00480"></a>00480     <span class="keyword">private</span>:
    423. 

  423. <a name="l00481"></a>00481         <span class="keyword">typedef</span> <span class="keyword">typename</span> remove_reference&lt;SrcP&gt;::type src_pixel_t;
    424. 

  424. <a name="l00482"></a>00482         <span class="keyword">typedef</span> <span class="keyword">typename</span> kth_element_type&lt;src_pixel_t, K&gt;::type channel_t;
    425. 

  425. <a name="l00483"></a>00483         <span class="keyword">typedef</span> <span class="keyword">typename</span> src_pixel_t::const_reference const_ref_t;
    426. 

  426. <a name="l00484"></a>00484         <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0604.html" title="Returns the type of a homogeneous pixel reference given the channel type, layout...">pixel_reference_type&lt;channel_t,gray_layout_t,false,is_mutable&gt;::type</a> ref_t;
    427. 

  427. <a name="l00485"></a>00485     <span class="keyword">public</span>:
    428. 

  428. <a name="l00486"></a>00486         <span class="keyword">typedef</span> <a class="code" href="g_i_l_0513.html" title="Function object that returns a grayscale reference of the K-th channel (specified...">kth_channel_deref_fn&lt;K,const_ref_t&gt;</a>                               <a class="code" href="g_i_l_0513.html" title="Function object that returns a grayscale reference of the K-th channel (specified...">const_t</a>;
    429. 

  429. <a name="l00487"></a>00487         <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0606.html" title="Returns the type of a homogeneous pixel given the channel type and layout.">pixel_value_type&lt;channel_t,gray_layout_t&gt;::type</a>          <a class="code" href="g_i_l_0599.html" title="Represents a pixel value (a container of channels). Models: HomogeneousColorBaseValueConcept...">value_type</a>;
    430. 

  430. <a name="l00488"></a>00488         <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="g_i_l_0604.html" title="Returns the type of a homogeneous pixel reference given the channel type, layout...">pixel_reference_type&lt;channel_t,gray_layout_t,false,false&gt;::type</a> const_reference;
    431. 

  431. <a name="l00489"></a>00489         <span class="keyword">typedef</span> SrcP                                                              argument_type;
    432. 

  432. <a name="l00490"></a>00490         <span class="keyword">typedef</span> <span class="keyword">typename</span> mpl::if_c&lt;is_mutable, ref_t, value_type&gt;::type           reference;
    433. 

  433. <a name="l00491"></a>00491         <span class="keyword">typedef</span> reference                                                         result_type;
    434. 

  434. <a name="l00492"></a>00492 
    435. 

  435. <a name="l00493"></a>00493         <a class="code" href="g_i_l_0513.html" title="Function object that returns a grayscale reference of the K-th channel (specified...">kth_channel_deref_fn</a>() {}
    436. 

  436. <a name="l00494"></a>00494         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt; <a class="code" href="g_i_l_0513.html" title="Function object that returns a grayscale reference of the K-th channel (specified...">kth_channel_deref_fn</a>(<span class="keyword">const</span> <a class="code" href="g_i_l_0513.html" title="Function object that returns a grayscale reference of the K-th channel (specified...">kth_channel_deref_fn&lt;K,P&gt;</a>&amp;) {}
    437. 

  437. <a name="l00495"></a>00495 
    438. 

  438. <a name="l00496"></a>00496         result_type operator()(argument_type srcP)<span class="keyword"> const </span>{ 
    439. 

  439. <a name="l00497"></a>00497             <span class="keywordflow">return</span> result_type(at_c&lt;K&gt;(srcP)); 
    440. 

  440. <a name="l00498"></a>00498         }
    441. 

  441. <a name="l00499"></a>00499     };
    442. 

  442. <a name="l00500"></a>00500 
    443. 

  443. <a name="l00501"></a>00501     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>__kth_channel_view&lt;K,View,false&gt; {
    444. 

  444. <a name="l00502"></a>00502     <span class="keyword">private</span>:
    445. 

  445. <a name="l00503"></a>00503         <span class="keyword">typedef</span> <a class="code" href="g_i_l_0513.html" title="Function object that returns a grayscale reference of the K-th channel (specified...">kth_channel_deref_fn&lt;K,typename View::reference&gt;</a> deref_t;
    446. 

  446. <a name="l00504"></a>00504         <span class="keyword">typedef</span> <span class="keyword">typename</span> View::template add_deref&lt;deref_t&gt;   AD;
    447. 

  447. <a name="l00505"></a>00505     <span class="keyword">public</span>:
    448. 

  448. <a name="l00506"></a>00506         <span class="keyword">typedef</span> <span class="keyword">typename</span> AD::type type;
    449. 

  449. <a name="l00507"></a>00507         <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src) {
    450. 

  450. <a name="l00508"></a>00508             <span class="keywordflow">return</span> AD::make(src, deref_t());
    451. 

  451. <a name="l00509"></a>00509         }
    452. 

  452. <a name="l00510"></a>00510     };
    453. 

  453. <a name="l00511"></a>00511 } <span class="comment">// namespace detail</span>
    454. 

  454. <a name="l00512"></a>00512 
    455. 

  455. <a name="l00519"></a>00519 <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> View&gt;
    456. 

  456. <a name="l00520"></a><a class="code" href="g_i_l_0559.html">00520</a> <span class="keyword">struct </span><a class="code" href="g_i_l_0559.html" title="Given a source image view type View, returns the type of an image view over a given...">kth_channel_view_type</a> {
    457. 

  457. <a name="l00521"></a>00521 <span class="keyword">private</span>:
    458. 

  458. <a name="l00522"></a>00522     GIL_CLASS_REQUIRE(View, boost::gil, <a class="code" href="g_i_l_0308.html" title="GIL&amp;#39;s 2-dimensional view over immutable GIL pixels.">ImageViewConcept</a>)
    459. 

  459. <a name="l00523"></a>00523     <span class="keyword">typedef</span> detail::__kth_channel_view&lt;K,View,view_is_basic&lt;View&gt;::value&gt; VB;
    460. 

  460. <a name="l00524"></a>00524 <span class="keyword">public</span>:
    461. 

  461. <a name="l00525"></a>00525     <span class="keyword">typedef</span> <span class="keyword">typename</span> VB::type type;
    462. 

  462. <a name="l00526"></a>00526     <span class="keyword">static</span> type make(<span class="keyword">const</span> View&amp; src) { <span class="keywordflow">return</span> VB::make(src); }
    463. 

  463. <a name="l00527"></a>00527 };
    464. 

  464. <a name="l00528"></a>00528 
    465. 

  465. <a name="l00530"></a>00530 <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> View&gt;
    466. 

  466. <a name="l00531"></a>00531 <span class="keyword">typename</span> <a class="code" href="g_i_l_0559.html" title="Given a source image view type View, returns the type of an image view over a given...">kth_channel_view_type&lt;K,View&gt;::type</a> kth_channel_view(<span class="keyword">const</span> View&amp; src) {
    467. 

  467. <a name="l00532"></a>00532     <span class="keywordflow">return</span> <a class="code" href="g_i_l_0559.html" title="Given a source image view type View, returns the type of an image view over a given...">kth_channel_view_type&lt;K,View&gt;::make</a>(src);
    468. 

  468. <a name="l00533"></a>00533 }
    469. 

  469. <a name="l00534"></a>00534 
    470. 

  470. <a name="l00535"></a>00535 } }  <span class="comment">// namespace boost::gil</span>
    471. 

  471. <a name="l00536"></a>00536 
    472. 

  472. <a name="l00537"></a>00537 <span class="preprocessor">#endif</span>
    473. 

  473. </pre></div></div>
    474. 

  474. <hr size="1"><address style="text-align: right;"><small>Generated on Sat May 2 13:50:14 2009 for Generic Image Library by&nbsp;
    475. 

  475. <a href="http://www.doxygen.org/index.html">
    476. 

  476. <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
    477. 

  477. </body>
    478. 

  478. </html>
    479. 

  479.