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 41<h1>iterator_from_2d.hpp</h1><a href="g_i_l_0230.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<a name="l00002"></a>00002 <span class="comment">    Copyright 2005-2007 Adobe Systems Incorporated</span>
 43<a name="l00003"></a>00003 <span class="comment">   </span>
 44<a name="l00004"></a>00004 <span class="comment">    Use, modification and distribution are subject to the Boost Software License,</span>
 45<a name="l00005"></a>00005 <span class="comment">    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
 46<a name="l00006"></a>00006 <span class="comment">    http://www.boost.org/LICENSE_1_0.txt).</span>
 47<a name="l00007"></a>00007 <span class="comment"></span>
 48<a name="l00008"></a>00008 <span class="comment">    See http://opensource.adobe.com/gil for most recent version including documentation.</span>
 49<a name="l00009"></a>00009 <span class="comment">*/</span>
 50<a name="l00010"></a>00010 <span class="comment">/*************************************************************************************************/</span>
 51<a name="l00011"></a>00011 
 52<a name="l00012"></a>00012 <span class="preprocessor">#ifndef GIL_ITERATOR_FROM_2D_H</span>
 53<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#define GIL_ITERATOR_FROM_2D_H</span>
 54<a name="l00014"></a>00014 <span class="preprocessor"></span>
 55<a name="l00023"></a>00023 
 56<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;cassert&gt;</span>
 57<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;boost/iterator/iterator_facade.hpp&gt;</span>
 58<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="g_i_l_0092.html" title="Concept check classes for GIL concepts.">gil_concept.hpp</a>"</span>
 59<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="g_i_l_0094.html" title="GIL configuration file.">gil_config.hpp</a>"</span>
 60<a name="l00028"></a>00028 <span class="preprocessor">#include "<a class="code" href="g_i_l_0243.html" title="pixel iterator support">pixel_iterator.hpp</a>"</span>
 61<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="locator_8hpp.html" title="pixel 2D locator">locator.hpp</a>"</span>
 62<a name="l00030"></a>00030 
 63<a name="l00031"></a>00031 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
 64<a name="l00032"></a>00032 
 65<a name="l00038"></a>00038 
 66<a name="l00039"></a>00039 
 67<a name="l00043"></a>00043 
 68<a name="l00044"></a>00044 
 69<a name="l00050"></a>00050 
 70<a name="l00051"></a>00051 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc2&gt;    <span class="comment">// Models PixelLocatorConcept</span>
 71<a name="l00052"></a><a class="code" href="g_i_l_0042.html">00052</a> <span class="keyword">class </span><a class="code" href="g_i_l_0042.html" title="Provides 1D random-access navigation to the pixels of the image. Models: PixelIteratorConcept...">iterator_from_2d</a> : <span class="keyword">public</span> iterator_facade&lt;iterator_from_2d&lt;Loc2&gt;,
 72<a name="l00053"></a>00053                                                 typename Loc2::value_type,
 73<a name="l00054"></a>00054                                                 random_access_traversal_tag,
 74<a name="l00055"></a>00055                                                 typename Loc2::reference,
 75<a name="l00056"></a>00056                                                 typename Loc2::coord_t&gt; {
 76<a name="l00057"></a>00057     GIL_CLASS_REQUIRE(Loc2, boost::gil, <a class="code" href="g_i_l_0354.html" title="GIL&amp;#39;s 2-dimensional locator over immutable GIL pixels.">PixelLocatorConcept</a>)
 77<a name="l00058"></a>00058 <span class="keyword">public</span>:
 78<a name="l00059"></a>00059     <span class="keyword">typedef</span> iterator_facade&lt;iterator_from_2d&lt;Loc2&gt;,
 79<a name="l00060"></a>00060                             <span class="keyword">typename</span> Loc2::value_type,
 80<a name="l00061"></a>00061                             random_access_traversal_tag,
 81<a name="l00062"></a>00062                             <span class="keyword">typename</span> Loc2::reference,
 82<a name="l00063"></a>00063                             <span class="keyword">typename</span> Loc2::coord_t&gt; parent_t;
 83<a name="l00064"></a>00064     <span class="keyword">typedef</span> <span class="keyword">typename</span> parent_t::reference       reference;
 84<a name="l00065"></a>00065     <span class="keyword">typedef</span> <span class="keyword">typename</span> parent_t::difference_type difference_type;
 85<a name="l00066"></a>00066     <span class="keyword">typedef</span> <span class="keyword">typename</span> Loc2::x_iterator          x_iterator;
 86<a name="l00067"></a>00067     <span class="keyword">typedef</span> <span class="keyword">typename</span> Loc2::point_t             point_t;
 87<a name="l00068"></a>00068 
 88<a name="l00069"></a>00069     std::ptrdiff_t width()<span class="keyword">         const </span>{ <span class="keywordflow">return</span> _width; }            <span class="comment">// number of pixels per image row</span>
 89<a name="l00070"></a>00070     std::ptrdiff_t x_pos()<span class="keyword">         const </span>{ <span class="keywordflow">return</span> _coords.<a class="code" href="g_i_l_0060.html#9a4f74af87a76a4c3dcb729cb0e68f8d">x</a>; }         <span class="comment">// current x position</span>
 90<a name="l00071"></a>00071     std::ptrdiff_t y_pos()<span class="keyword">         const </span>{ <span class="keywordflow">return</span> _coords.<a class="code" href="g_i_l_0060.html#1cb2b5ea04251d543e49356ef54eb853">y</a>; }         <span class="comment">// current y position</span>
 91<a name="l00072"></a>00072 
 92<a name="l00075"></a><a class="code" href="g_i_l_0042.html#de1279c4ed222b6efb0867c038765ea1">00075</a>     reference <a class="code" href="g_i_l_0042.html#de1279c4ed222b6efb0867c038765ea1">operator[]</a>(difference_type d)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *(*<span class="keyword">this</span>+d); }
 93<a name="l00076"></a>00076 
 94<a name="l00077"></a>00077     <span class="keywordtype">bool</span>            is_1d_traversable()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _p.is_1d_traversable(width()); }   <span class="comment">// is there no gap at the end of each row?</span>
 95<a name="l00078"></a>00078     x_iterator&amp;     x()                   { <span class="keywordflow">return</span> _p.x(); }
 96<a name="l00079"></a>00079 
 97<a name="l00080"></a>00080     iterator_from_2d(){}
 98<a name="l00081"></a>00081     iterator_from_2d(<span class="keyword">const</span> Loc2&amp; p, std::ptrdiff_t width, std::ptrdiff_t x=0, std::ptrdiff_t y=0) : _coords(x,y), _width(width), _p(p) {}
 99<a name="l00082"></a>00082     iterator_from_2d(<span class="keyword">const</span> iterator_from_2d&amp; pit) : _coords(pit._coords), _width(pit._width), _p(pit._p) {}
100<a name="l00083"></a>00083     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; iterator_from_2d(<span class="keyword">const</span> iterator_from_2d&lt;Loc&gt;&amp; pit) : _coords(pit._coords), _width(pit._width), _p(pit._p) {}
101<a name="l00084"></a>00084 
102<a name="l00085"></a>00085 <span class="keyword">private</span>:
103<a name="l00086"></a>00086     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="keyword">friend</span> <span class="keyword">class </span>iterator_from_2d;
104<a name="l00087"></a>00087     <span class="keyword">friend</span> <span class="keyword">class </span>boost::iterator_core_access;
105<a name="l00088"></a>00088     reference dereference()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *_p; }
106<a name="l00089"></a>00089     <span class="keywordtype">void</span> increment() {
107<a name="l00090"></a>00090         ++_coords.x;
108<a name="l00091"></a>00091         ++_p.x();
109<a name="l00092"></a>00092         <span class="keywordflow">if</span> (_coords.x&gt;=_width) {
110<a name="l00093"></a>00093             _coords.x=0;
111<a name="l00094"></a>00094             ++_coords.y;
112<a name="l00095"></a>00095             _p+=point_t(-_width,1);
113<a name="l00096"></a>00096         }           
114<a name="l00097"></a>00097     }
115<a name="l00098"></a>00098     <span class="keywordtype">void</span> decrement() {
116<a name="l00099"></a>00099         --_coords.x;
117<a name="l00100"></a>00100         --_p.x();
118<a name="l00101"></a>00101         <span class="keywordflow">if</span> (_coords.x&lt;0) {
119<a name="l00102"></a>00102             _coords.x=_width-1;
120<a name="l00103"></a>00103             --_coords.y;
121<a name="l00104"></a>00104             _p+=point_t(_width,-1);
122<a name="l00105"></a>00105         }
123<a name="l00106"></a>00106     }
124<a name="l00107"></a>00107 
125<a name="l00108"></a>00108     GIL_FORCEINLINE <span class="keywordtype">void</span> advance(difference_type d) {  
126<a name="l00109"></a>00109         <span class="keywordflow">if</span> (_width==0) <span class="keywordflow">return</span>;  <span class="comment">// unfortunately we need to check for that. Default-constructed images have width of 0 and the code below will throw if executed.</span>
127<a name="l00110"></a>00110         point_t delta;
128<a name="l00111"></a>00111         <span class="keywordflow">if</span> (_coords.x+d&gt;=0) {  <span class="comment">// not going back to a previous row?</span>
129<a name="l00112"></a>00112             delta.x=(_coords.x+(std::ptrdiff_t)d)%_width - _coords.x;
130<a name="l00113"></a>00113             delta.y=(_coords.x+(std::ptrdiff_t)d)/_width;
131<a name="l00114"></a>00114         } <span class="keywordflow">else</span> {
132<a name="l00115"></a>00115             delta.x=(_coords.x+(std::ptrdiff_t)d*(1-_width))%_width -_coords.x;
133<a name="l00116"></a>00116             delta.y=-(_width-_coords.x-(std::ptrdiff_t)d-1)/_width;
134<a name="l00117"></a>00117         }   
135<a name="l00118"></a>00118         _p+=delta;
136<a name="l00119"></a>00119         _coords.x+=delta.x;
137<a name="l00120"></a>00120         _coords.y+=delta.y;
138<a name="l00121"></a>00121     }
139<a name="l00122"></a>00122 
140<a name="l00123"></a>00123     difference_type distance_to(<span class="keyword">const</span> iterator_from_2d&amp; it)<span class="keyword"> const </span>{ 
141<a name="l00124"></a>00124         <span class="keywordflow">if</span> (_width==0) <span class="keywordflow">return</span> 0;
142<a name="l00125"></a>00125         <span class="keywordflow">return</span> (it.y_pos()-_coords.y)*_width + (it.x_pos()-_coords.x);
143<a name="l00126"></a>00126     }
144<a name="l00127"></a>00127 
145<a name="l00128"></a>00128     <span class="keywordtype">bool</span> <a class="code" href="g_i_l_0214.html#g4ed3cf71cb0fbf435d1389df8567a4e5" title="std::equal(I1,I1,I2) with I1 and I2 being a iterator_from_2d">equal</a>(<span class="keyword">const</span> iterator_from_2d&amp; it)<span class="keyword"> const </span>{
146<a name="l00129"></a>00129         assert(_width==it.width());     <span class="comment">// they must belong to the same image</span>
147<a name="l00130"></a>00130         <span class="keywordflow">return</span> _coords==it._coords &amp;&amp; _p==it._p;
148<a name="l00131"></a>00131     }
149<a name="l00132"></a>00132 
150<a name="l00133"></a>00133     point2&lt;std::ptrdiff_t&gt; _coords;
151<a name="l00134"></a>00134     std::ptrdiff_t _width;
152<a name="l00135"></a>00135     Loc2 _p;
153<a name="l00136"></a>00136 };
154<a name="l00137"></a>00137 
155<a name="l00138"></a>00138 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span>
156<a name="l00139"></a>00139 <span class="keyword">struct </span>const_iterator_type&lt;iterator_from_2d&lt;Loc&gt; &gt; {
157<a name="l00140"></a>00140     <span class="keyword">typedef</span> iterator_from_2d&lt;typename Loc::const_t&gt; type;
158<a name="l00141"></a>00141 };
159<a name="l00142"></a>00142 
160<a name="l00143"></a>00143 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span>
161<a name="l00144"></a>00144 <span class="keyword">struct </span>iterator_is_mutable&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> iterator_is_mutable&lt;typename Loc::x_iterator&gt; {};
162<a name="l00145"></a>00145 
163<a name="l00146"></a>00146 
164<a name="l00148"></a>00148 <span class="comment">//  HasDynamicXStepTypeConcept</span>
165<a name="l00150"></a>00150 <span class="comment"></span>
166<a name="l00151"></a>00151 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt;
167<a name="l00152"></a>00152 <span class="keyword">struct </span>dynamic_x_step_type&lt;iterator_from_2d&lt;Loc&gt; &gt; {
168<a name="l00153"></a>00153     <span class="keyword">typedef</span> iterator_from_2d&lt;typename dynamic_x_step_type&lt;Loc&gt;::type&gt;  type;
169<a name="l00154"></a>00154 };
170<a name="l00155"></a>00155 
171<a name="l00156"></a>00156 
172<a name="l00158"></a>00158 <span class="comment">//  PixelBasedConcept</span>
173<a name="l00160"></a>00160 <span class="comment"></span>
174<a name="l00161"></a>00161 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span>
175<a name="l00162"></a>00162 <span class="keyword">struct </span>color_space_type&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> color_space_type&lt;Loc&gt; {};
176<a name="l00163"></a>00163 
177<a name="l00164"></a>00164 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span>
178<a name="l00165"></a>00165 <span class="keyword">struct </span>channel_mapping_type&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> channel_mapping_type&lt;Loc&gt; {};
179<a name="l00166"></a>00166 
180<a name="l00167"></a>00167 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span>
181<a name="l00168"></a>00168 <span class="keyword">struct </span>is_planar&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> is_planar&lt;Loc&gt; {};
182<a name="l00169"></a>00169 
183<a name="l00170"></a>00170 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Loc&gt; <span class="comment">// Models PixelLocatorConcept</span>
184<a name="l00171"></a>00171 <span class="keyword">struct </span>channel_type&lt;iterator_from_2d&lt;Loc&gt; &gt; : <span class="keyword">public</span> channel_type&lt;Loc&gt; {};
185<a name="l00172"></a>00172 
186<a name="l00173"></a>00173 } }  <span class="comment">// namespace boost::gil</span>
187<a name="l00174"></a>00174 
188<a name="l00175"></a>00175 <span class="preprocessor">#endif</span>
189</pre></div></div>
190<hr size="1"><address style="text-align: right;"><small>Generated on Sat May 2 13:50:14 2009 for Generic Image Library by&nbsp;
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192<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
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