ceph/src/boost/libs/gil/doc/html/g_i_l_0253.html

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  41 <h1>png_io_private.hpp</h1><a href="g_i_l_0254.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://stlab.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_PNG_IO_PRIVATE_H</span>
  53 <a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#define GIL_PNG_IO_PRIVATE_H</span>
  54 <a name="l00014"></a>00014 <span class="preprocessor"></span>
  55 <a name="l00020"></a>00020
  56 <a name="l00021"></a>00021 <span class="preprocessor">#include &lt;algorithm&gt;</span>
  57 <a name="l00022"></a>00022 <span class="preprocessor">#include &lt;vector&gt;</span>
  58 <a name="l00023"></a>00023 <span class="preprocessor">#include &lt;boost/static_assert.hpp&gt;</span>
  59 <a name="l00024"></a>00024 <span class="preprocessor">#include "../../gil_all.hpp"</span>
  60 <a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="io__error_8hpp.html" title="Handle input-output errors.">io_error.hpp</a>"</span>
  61 <a name="l00026"></a>00026 <span class="preprocessor">#include &lt;png.h&gt;</span>
  62 <a name="l00027"></a>00027
  63 <a name="l00028"></a>00028 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
  64 <a name="l00029"></a>00029
  65 <a name="l00030"></a>00030 <span class="keyword">namespace </span>detail {
  66 <a name="l00031"></a>00031
  67 <a name="l00032"></a>00032 <span class="keyword">static</span> <span class="keyword">const</span> std::size_t PNG_BYTES_TO_CHECK = 4;
  68 <a name="l00033"></a>00033
  69 <a name="l00034"></a>00034 <span class="comment">// lbourdev: These can be greatly simplified, for example:</span>
  70 <a name="l00035"></a>00035 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Cs&gt; <span class="keyword">struct </span>png_color_type {BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=0);};
  71 <a name="l00036"></a>00036 <span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span>png_color_type&lt;gray_t&gt; { BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY); };
  72 <a name="l00037"></a>00037 <span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span>png_color_type&lt;rgb_t&gt;  { BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB); };
  73 <a name="l00038"></a>00038 <span class="keyword">template</span>&lt;&gt; <span class="keyword">struct </span>png_color_type&lt;rgba_t&gt; { BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA); };
  74 <a name="l00039"></a>00039
  75 <a name="l00040"></a>00040 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel,<span class="keyword">typename</span> ColorSpace&gt; <span class="keyword">struct </span>png_is_supported {BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,value=<span class="keyword">false</span>);};
  76 <a name="l00041"></a>00041 <span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>png_is_supported&lt;bits8,gray_t&gt;  {BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,value=<span class="keyword">true</span>);};
  77 <a name="l00042"></a>00042 <span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>png_is_supported&lt;bits8,rgb_t&gt;   {BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,value=<span class="keyword">true</span>);};
  78 <a name="l00043"></a>00043 <span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>png_is_supported&lt;bits8,rgba_t&gt;  {BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,value=<span class="keyword">true</span>);};
  79 <a name="l00044"></a>00044 <span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>png_is_supported&lt;bits16,gray_t&gt; {BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,value=<span class="keyword">true</span>);};
  80 <a name="l00045"></a>00045 <span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>png_is_supported&lt;bits16,rgb_t&gt;  {BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,value=<span class="keyword">true</span>);};
  81 <a name="l00046"></a>00046 <span class="keyword">template</span> &lt;&gt; <span class="keyword">struct </span>png_is_supported&lt;bits16,rgba_t&gt; {BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,value=<span class="keyword">true</span>);};
  82 <a name="l00047"></a>00047
  83 <a name="l00048"></a>00048 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel&gt; <span class="keyword">struct </span>png_bit_depth {BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=<span class="keyword">sizeof</span>(Channel)*8);};
  84 <a name="l00049"></a>00049
  85 <a name="l00050"></a>00050 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel,<span class="keyword">typename</span> ColorSpace&gt;
  86 <a name="l00051"></a>00051 <span class="keyword">struct </span>png_read_support_private {
  87 <a name="l00052"></a>00052     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">false</span>);
  88 <a name="l00053"></a>00053     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=0);
  89 <a name="l00054"></a>00054     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=0);
  90 <a name="l00055"></a>00055 };
  91 <a name="l00056"></a>00056 <span class="keyword">template</span> &lt;&gt;
  92 <a name="l00057"></a>00057 <span class="keyword">struct </span>png_read_support_private&lt;bits8,gray_t&gt; {
  93 <a name="l00058"></a>00058     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
  94 <a name="l00059"></a>00059     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
  95 <a name="l00060"></a>00060     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
  96 <a name="l00061"></a>00061 };
  97 <a name="l00062"></a>00062 <span class="keyword">template</span> &lt;&gt;
  98 <a name="l00063"></a>00063 <span class="keyword">struct </span>png_read_support_private&lt;bits8,rgb_t&gt; {
  99 <a name="l00064"></a>00064     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 100 <a name="l00065"></a>00065     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
 101 <a name="l00066"></a>00066     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
 102 <a name="l00067"></a>00067 };
 103 <a name="l00068"></a>00068 <span class="keyword">template</span> &lt;&gt;
 104 <a name="l00069"></a>00069 <span class="keyword">struct </span>png_read_support_private&lt;bits8,rgba_t&gt; {
 105 <a name="l00070"></a>00070     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 106 <a name="l00071"></a>00071     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
 107 <a name="l00072"></a>00072     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
 108 <a name="l00073"></a>00073 };
 109 <a name="l00074"></a>00074 <span class="keyword">template</span> &lt;&gt;
 110 <a name="l00075"></a>00075 <span class="keyword">struct </span>png_read_support_private&lt;bits16,gray_t&gt; {
 111 <a name="l00076"></a>00076     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 112 <a name="l00077"></a>00077     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
 113 <a name="l00078"></a>00078     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
 114 <a name="l00079"></a>00079 };
 115 <a name="l00080"></a>00080 <span class="keyword">template</span> &lt;&gt;
 116 <a name="l00081"></a>00081 <span class="keyword">struct </span>png_read_support_private&lt;bits16,rgb_t&gt; {
 117 <a name="l00082"></a>00082     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 118 <a name="l00083"></a>00083     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
 119 <a name="l00084"></a>00084     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
 120 <a name="l00085"></a>00085 };
 121 <a name="l00086"></a>00086 <span class="keyword">template</span> &lt;&gt;
 122 <a name="l00087"></a>00087 <span class="keyword">struct </span>png_read_support_private&lt;bits16,rgba_t&gt; {
 123 <a name="l00088"></a>00088     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 124 <a name="l00089"></a>00089     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
 125 <a name="l00090"></a>00090     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
 126 <a name="l00091"></a>00091 };
 127 <a name="l00092"></a>00092
 128 <a name="l00093"></a>00093 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel,<span class="keyword">typename</span> ColorSpace&gt;
 129 <a name="l00094"></a>00094 <span class="keyword">struct </span>png_write_support_private {
 130 <a name="l00095"></a>00095     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">false</span>);
 131 <a name="l00096"></a>00096     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=0);
 132 <a name="l00097"></a>00097     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=0);
 133 <a name="l00098"></a>00098 };
 134 <a name="l00099"></a>00099 <span class="keyword">template</span> &lt;&gt;
 135 <a name="l00100"></a>00100 <span class="keyword">struct </span>png_write_support_private&lt;bits8,gray_t&gt; {
 136 <a name="l00101"></a>00101     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 137 <a name="l00102"></a>00102     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
 138 <a name="l00103"></a>00103     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
 139 <a name="l00104"></a>00104 };
 140 <a name="l00105"></a>00105 <span class="keyword">template</span> &lt;&gt;
 141 <a name="l00106"></a>00106 <span class="keyword">struct </span>png_write_support_private&lt;bits8,rgb_t&gt; {
 142 <a name="l00107"></a>00107     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 143 <a name="l00108"></a>00108     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
 144 <a name="l00109"></a>00109     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
 145 <a name="l00110"></a>00110 };
 146 <a name="l00111"></a>00111 <span class="keyword">template</span> &lt;&gt;
 147 <a name="l00112"></a>00112 <span class="keyword">struct </span>png_write_support_private&lt;bits8,rgba_t&gt; {
 148 <a name="l00113"></a>00113     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 149 <a name="l00114"></a>00114     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
 150 <a name="l00115"></a>00115     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
 151 <a name="l00116"></a>00116 };
 152 <a name="l00117"></a>00117 <span class="keyword">template</span> &lt;&gt;
 153 <a name="l00118"></a>00118 <span class="keyword">struct </span>png_write_support_private&lt;bits16,gray_t&gt; {
 154 <a name="l00119"></a>00119     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 155 <a name="l00120"></a>00120     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
 156 <a name="l00121"></a>00121     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
 157 <a name="l00122"></a>00122 };
 158 <a name="l00123"></a>00123 <span class="keyword">template</span> &lt;&gt;
 159 <a name="l00124"></a>00124 <span class="keyword">struct </span>png_write_support_private&lt;bits16,rgb_t&gt; {
 160 <a name="l00125"></a>00125     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 161 <a name="l00126"></a>00126     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
 162 <a name="l00127"></a>00127     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
 163 <a name="l00128"></a>00128 };
 164 <a name="l00129"></a>00129 <span class="keyword">template</span> &lt;&gt;
 165 <a name="l00130"></a>00130 <span class="keyword">struct </span>png_write_support_private&lt;bits16,rgba_t&gt; {
 166 <a name="l00131"></a>00131     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
 167 <a name="l00132"></a>00132     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
 168 <a name="l00133"></a>00133     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
 169 <a name="l00134"></a>00134 };
 170 <a name="l00135"></a>00135
 171 <a name="l00136"></a>00136 <span class="keyword">class </span>png_reader : <span class="keyword">public</span> file_mgr {
 172 <a name="l00137"></a>00137 <span class="keyword">protected</span>:
 173 <a name="l00138"></a>00138     png_structp _png_ptr;
 174 <a name="l00139"></a>00139     png_infop _info_ptr;
 175 <a name="l00140"></a>00140
 176 <a name="l00141"></a>00141     <span class="keywordtype">void</span> init() {
 177 <a name="l00142"></a>00142         <span class="keywordtype">char</span> buf[PNG_BYTES_TO_CHECK];
 178 <a name="l00143"></a>00143         <span class="comment">// read in some of the signature bytes</span>
 179 <a name="l00144"></a>00144         io_error_if(fread(buf, 1, PNG_BYTES_TO_CHECK, <span class="keyword">get</span>()) != detail::PNG_BYTES_TO_CHECK,
 180 <a name="l00145"></a>00145                     <span class="stringliteral">"png_check_validity: fail to read file"</span>);
 181 <a name="l00146"></a>00146         <span class="comment">// compare the first PNG_BYTES_TO_CHECK bytes of the signature.</span>
 182 <a name="l00147"></a>00147         io_error_if(png_sig_cmp((png_bytep)buf, (png_size_t)0, detail::PNG_BYTES_TO_CHECK)!=0,
 183 <a name="l00148"></a>00148                     <span class="stringliteral">"png_check_validity: invalid png file"</span>);
 184 <a name="l00149"></a>00149
 185 <a name="l00150"></a>00150         _png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
 186 <a name="l00151"></a>00151         io_error_if(_png_ptr==NULL,<span class="stringliteral">"png_get_file_size: fail to call png_create_write_struct()"</span>);
 187 <a name="l00152"></a>00152         <span class="comment">// allocate/initialize the image information data</span>
 188 <a name="l00153"></a>00153         _info_ptr = png_create_info_struct(_png_ptr);
 189 <a name="l00154"></a>00154         <span class="keywordflow">if</span> (_info_ptr == NULL) {
 190 <a name="l00155"></a>00155             png_destroy_read_struct(&amp;_png_ptr,png_infopp_NULL,png_infopp_NULL);
 191 <a name="l00156"></a>00156             io_error(<span class="stringliteral">"png_get_file_size: fail to call png_create_info_struct()"</span>);
 192 <a name="l00157"></a>00157         }
 193 <a name="l00158"></a>00158         <span class="keywordflow">if</span> (setjmp(png_jmpbuf(_png_ptr))) {
 194 <a name="l00159"></a>00159             <span class="comment">//free all of the memory associated with the png_ptr and info_ptr</span>
 195 <a name="l00160"></a>00160             png_destroy_read_struct(&amp;_png_ptr, &amp;_info_ptr, png_infopp_NULL);
 196 <a name="l00161"></a>00161             io_error(<span class="stringliteral">"png_get_file_size: fail to call setjmp()"</span>);
 197 <a name="l00162"></a>00162         }
 198 <a name="l00163"></a>00163         png_init_io(_png_ptr, <span class="keyword">get</span>());
 199 <a name="l00164"></a>00164         png_set_sig_bytes(_png_ptr,PNG_BYTES_TO_CHECK);
 200 <a name="l00165"></a>00165         png_read_info(_png_ptr, _info_ptr);
 201 <a name="l00166"></a>00166         <span class="keywordflow">if</span> (little_endian() &amp;&amp; png_get_bit_depth(_png_ptr,_info_ptr)&gt;8)
 202 <a name="l00167"></a>00167             png_set_swap(_png_ptr);
 203 <a name="l00168"></a>00168     }
 204 <a name="l00169"></a>00169 <span class="keyword">public</span>:
 205 <a name="l00170"></a>00170     png_reader(FILE* file          ) : file_mgr(file)           { init(); }
 206 <a name="l00171"></a>00171     png_reader(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename) : file_mgr(filename, <span class="stringliteral">"rb"</span>) { init(); }
 207 <a name="l00172"></a>00172
 208 <a name="l00173"></a>00173     ~png_reader() {
 209 <a name="l00174"></a>00174         png_destroy_read_struct(&amp;_png_ptr,&amp;_info_ptr,png_infopp_NULL);
 210 <a name="l00175"></a>00175     }
 211 <a name="l00176"></a>00176     point2&lt;std::ptrdiff_t&gt; get_dimensions() {
 212 <a name="l00177"></a>00177         <span class="keywordflow">return</span> point2&lt;std::ptrdiff_t&gt;(png_get_image_width(_png_ptr,_info_ptr),
 213 <a name="l00178"></a>00178                                       png_get_image_height(_png_ptr,_info_ptr));
 214 <a name="l00179"></a>00179     }
 215 <a name="l00180"></a>00180     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
 216 <a name="l00181"></a>00181     <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View&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>) {
 217 <a name="l00182"></a>00182         png_uint_32 width, height;
 218 <a name="l00183"></a>00183         <span class="keywordtype">int</span> bit_depth, color_type, interlace_type;
 219 <a name="l00184"></a>00184         png_get_IHDR(_png_ptr, _info_ptr,
 220 <a name="l00185"></a>00185                      &amp;width, &amp;height,&amp;bit_depth,&amp;color_type,&amp;interlace_type,
 221 <a name="l00186"></a>00186                      int_p_NULL, int_p_NULL);
 222 <a name="l00187"></a>00187         io_error_if(((png_uint_32)view.width()!=width || (png_uint_32)view.height()!= height),
 223 <a name="l00188"></a>00188                     <span class="stringliteral">"png_read_view: input view size does not match PNG file size"</span>);
 224 <a name="l00189"></a>00189
 225 <a name="l00190"></a>00190         <span class="keywordflow">if</span>(png_read_support_private&lt;<span class="keyword">typename</span> channel_type&lt;View&gt;::type,
 226 <a name="l00191"></a>00191                                     <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::bit_depth!=bit_depth ||
 227 <a name="l00192"></a>00192            png_read_support_private&lt;<span class="keyword">typename</span> channel_type&lt;View&gt;::type,
 228 <a name="l00193"></a>00193                                     <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::color_type!=color_type)
 229 <a name="l00194"></a>00194             io_error(<span class="stringliteral">"png_read_view: input view type is incompatible with the image type"</span>);
 230 <a name="l00195"></a>00195
 231 <a name="l00196"></a>00196         std::vector&lt;pixel&lt;typename channel_type&lt;View&gt;::type,
 232 <a name="l00197"></a>00197                           layout&lt;typename color_space_type&lt;View&gt;::type&gt; &gt; &gt; row(width);
 233 <a name="l00198"></a>00198         <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
 234 <a name="l00199"></a>00199             png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
 235 <a name="l00200"></a>00200             <a class="code" href="g_i_l_0214.html#g4e8a9e1bb08e76c93dc56a4626231ee1" title="Copy when both src and dst are planar pointers is copy for each channel.">std::copy</a>(row.begin(),row.end(),view.row_begin(y));
 236 <a name="l00201"></a>00201         }
 237 <a name="l00202"></a>00202         png_read_end(_png_ptr,NULL);
 238 <a name="l00203"></a>00203     }
 239 <a name="l00204"></a>00204
 240 <a name="l00205"></a>00205     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Image&gt;
 241 <a name="l00206"></a>00206     <span class="keywordtype">void</span> read_image(Image&amp; im) {
 242 <a name="l00207"></a>00207         im.recreate(get_dimensions());
 243 <a name="l00208"></a>00208         apply(<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>(im));
 244 <a name="l00209"></a>00209     }
 245 <a name="l00210"></a>00210 };
 246 <a name="l00211"></a>00211
 247 <a name="l00212"></a>00212 <span class="comment">// This code will be simplified...</span>
 248 <a name="l00213"></a>00213 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> CC&gt;
 249 <a name="l00214"></a>00214 <span class="keyword">class </span>png_reader_color_convert : <span class="keyword">public</span> png_reader {
 250 <a name="l00215"></a>00215 <span class="keyword">private</span>:
 251 <a name="l00216"></a>00216     CC _cc;
 252 <a name="l00217"></a>00217 <span class="keyword">public</span>:
 253 <a name="l00218"></a>00218     png_reader_color_convert(FILE* file          ,CC cc_in) : png_reader(file),_cc(cc_in) {}
 254 <a name="l00219"></a>00219     png_reader_color_convert(FILE* file          ) : png_reader(file) {}
 255 <a name="l00220"></a>00220     png_reader_color_convert(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename,CC cc_in) : png_reader(filename),_cc(cc_in) {}
 256 <a name="l00221"></a>00221     png_reader_color_convert(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename) : png_reader(filename) {}
 257 <a name="l00222"></a>00222     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
 258 <a name="l00223"></a>00223     <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View&amp; view) {
 259 <a name="l00224"></a>00224         png_uint_32 width, height;
 260 <a name="l00225"></a>00225         <span class="keywordtype">int</span> bit_depth, color_type, interlace_type;
 261 <a name="l00226"></a>00226         png_get_IHDR(_png_ptr, _info_ptr,
 262 <a name="l00227"></a>00227                      &amp;width, &amp;height,&amp;bit_depth,&amp;color_type,&amp;interlace_type,
 263 <a name="l00228"></a>00228                      int_p_NULL, int_p_NULL);
 264 <a name="l00229"></a>00229         io_error_if(((png_uint_32)view.width()!=width || (png_uint_32)view.height()!= height),
 265 <a name="l00230"></a>00230                     <span class="stringliteral">"png_reader_color_convert::apply(): input view size does not match PNG file size"</span>);
 266 <a name="l00231"></a>00231         <span class="keywordflow">switch</span> (color_type) {
 267 <a name="l00232"></a>00232         <span class="keywordflow">case</span> PNG_COLOR_TYPE_GRAY:
 268 <a name="l00233"></a>00233             <span class="keywordflow">switch</span> (bit_depth) {
 269 <a name="l00234"></a>00234             <span class="keywordflow">case</span> 8: {
 270 <a name="l00235"></a>00235                 std::vector&lt;gray8_pixel_t&gt; row(width);
 271 <a name="l00236"></a>00236                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
 272 <a name="l00237"></a>00237                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
 273 <a name="l00238"></a>00238                     std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn&lt;gray8_ref_t,typename View::value_type,CC&gt;(_cc));
 274 <a name="l00239"></a>00239                 }
 275 <a name="l00240"></a>00240                 <span class="keywordflow">break</span>;
 276 <a name="l00241"></a>00241             }
 277 <a name="l00242"></a>00242             <span class="keywordflow">case</span> 16: {
 278 <a name="l00243"></a>00243                 std::vector&lt;gray16_pixel_t&gt; row(width);
 279 <a name="l00244"></a>00244                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
 280 <a name="l00245"></a>00245                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
 281 <a name="l00246"></a>00246                     std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn&lt;gray16_ref_t,typename View::value_type,CC&gt;(_cc));
 282 <a name="l00247"></a>00247                 }
 283 <a name="l00248"></a>00248                 <span class="keywordflow">break</span>;
 284 <a name="l00249"></a>00249             }
 285 <a name="l00250"></a>00250             <span class="keywordflow">default</span>: io_error(<span class="stringliteral">"png_reader_color_convert::apply(): unknown combination of color type and bit depth"</span>);
 286 <a name="l00251"></a>00251             }
 287 <a name="l00252"></a>00252             <span class="keywordflow">break</span>;
 288 <a name="l00253"></a>00253         <span class="keywordflow">case</span> PNG_COLOR_TYPE_RGB:
 289 <a name="l00254"></a>00254             <span class="keywordflow">switch</span> (bit_depth) {
 290 <a name="l00255"></a>00255             <span class="keywordflow">case</span> 8: {
 291 <a name="l00256"></a>00256                 std::vector&lt;rgb8_pixel_t&gt; row(width);
 292 <a name="l00257"></a>00257                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
 293 <a name="l00258"></a>00258                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
 294 <a name="l00259"></a>00259                     std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn&lt;rgb8_ref_t,typename View::value_type,CC&gt;(_cc));
 295 <a name="l00260"></a>00260                 }
 296 <a name="l00261"></a>00261                 <span class="keywordflow">break</span>;
 297 <a name="l00262"></a>00262             }
 298 <a name="l00263"></a>00263             <span class="keywordflow">case</span> 16: {
 299 <a name="l00264"></a>00264                 std::vector&lt;rgb16_pixel_t&gt; row(width);
 300 <a name="l00265"></a>00265                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
 301 <a name="l00266"></a>00266                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
 302 <a name="l00267"></a>00267                     std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn&lt;rgb16_ref_t,typename View::value_type,CC&gt;(_cc));
 303 <a name="l00268"></a>00268                 }
 304 <a name="l00269"></a>00269                 <span class="keywordflow">break</span>;
 305 <a name="l00270"></a>00270             }
 306 <a name="l00271"></a>00271             <span class="keywordflow">default</span>: io_error(<span class="stringliteral">"png_reader_color_convert::apply(): unknown combination of color type and bit depth"</span>);
 307 <a name="l00272"></a>00272             }
 308 <a name="l00273"></a>00273             <span class="keywordflow">break</span>;
 309 <a name="l00274"></a>00274         <span class="keywordflow">case</span> PNG_COLOR_TYPE_RGBA:
 310 <a name="l00275"></a>00275             <span class="keywordflow">switch</span> (bit_depth) {
 311 <a name="l00276"></a>00276             <span class="keywordflow">case</span> 8: {
 312 <a name="l00277"></a>00277                 std::vector&lt;rgba8_pixel_t&gt; row(width);
 313 <a name="l00278"></a>00278                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
 314 <a name="l00279"></a>00279                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
 315 <a name="l00280"></a>00280                     std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn&lt;rgba8_ref_t,typename View::value_type,CC&gt;(_cc));
 316 <a name="l00281"></a>00281                 }
 317 <a name="l00282"></a>00282                 <span class="keywordflow">break</span>;
 318 <a name="l00283"></a>00283             }
 319 <a name="l00284"></a>00284             <span class="keywordflow">case</span> 16: {
 320 <a name="l00285"></a>00285                 std::vector&lt;rgba16_pixel_t&gt; row(width);
 321 <a name="l00286"></a>00286                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
 322 <a name="l00287"></a>00287                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
 323 <a name="l00288"></a>00288                     std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn&lt;rgba16_ref_t,typename View::value_type,CC&gt;(_cc));
 324 <a name="l00289"></a>00289                 }
 325 <a name="l00290"></a>00290                 <span class="keywordflow">break</span>;
 326 <a name="l00291"></a>00291             }
 327 <a name="l00292"></a>00292             <span class="keywordflow">default</span>: io_error(<span class="stringliteral">"png_reader_color_convert::apply(): unknown combination of color type and bit depth"</span>);
 328 <a name="l00293"></a>00293             }
 329 <a name="l00294"></a>00294             <span class="keywordflow">break</span>;
 330 <a name="l00295"></a>00295         <span class="keywordflow">default</span>: io_error(<span class="stringliteral">"png_reader_color_convert::apply(): unknown color type"</span>);
 331 <a name="l00296"></a>00296         }
 332 <a name="l00297"></a>00297         png_read_end(_png_ptr,NULL);
 333 <a name="l00298"></a>00298     }
 334 <a name="l00299"></a>00299     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Image&gt;
 335 <a name="l00300"></a>00300     <span class="keywordtype">void</span> read_image(Image&amp; im) {
 336 <a name="l00301"></a>00301         im.recreate(get_dimensions());
 337 <a name="l00302"></a>00302         apply(<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>(im));
 338 <a name="l00303"></a>00303     }
 339 <a name="l00304"></a>00304 };
 340 <a name="l00305"></a>00305
 341 <a name="l00306"></a>00306
 342 <a name="l00307"></a>00307 <span class="keyword">class </span>png_writer : <span class="keyword">public</span> file_mgr {
 343 <a name="l00308"></a>00308 <span class="keyword">protected</span>:
 344 <a name="l00309"></a>00309     png_structp _png_ptr;
 345 <a name="l00310"></a>00310     png_infop _info_ptr;
 346 <a name="l00311"></a>00311
 347 <a name="l00312"></a>00312     <span class="keywordtype">void</span> init() {
 348 <a name="l00313"></a>00313         _png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
 349 <a name="l00314"></a>00314         io_error_if(!_png_ptr,<span class="stringliteral">"png_write_initialize: fail to call png_create_write_struct()"</span>);
 350 <a name="l00315"></a>00315         _info_ptr = png_create_info_struct(_png_ptr);
 351 <a name="l00316"></a>00316         <span class="keywordflow">if</span> (!_info_ptr) {
 352 <a name="l00317"></a>00317             png_destroy_write_struct(&amp;_png_ptr,png_infopp_NULL);
 353 <a name="l00318"></a>00318             io_error(<span class="stringliteral">"png_write_initialize: fail to call png_create_info_struct()"</span>);
 354 <a name="l00319"></a>00319         }
 355 <a name="l00320"></a>00320         <span class="keywordflow">if</span> (setjmp(png_jmpbuf(_png_ptr))) {
 356 <a name="l00321"></a>00321             png_destroy_write_struct(&amp;_png_ptr, &amp;_info_ptr);
 357 <a name="l00322"></a>00322             io_error(<span class="stringliteral">"png_write_initialize: fail to call setjmp(png_jmpbuf())"</span>);
 358 <a name="l00323"></a>00323         }
 359 <a name="l00324"></a>00324         png_init_io(_png_ptr,<span class="keyword">get</span>());
 360 <a name="l00325"></a>00325     }
 361 <a name="l00326"></a>00326 <span class="keyword">public</span>:
 362 <a name="l00327"></a>00327     png_writer(FILE* file          ) : file_mgr(file)           { init(); }
 363 <a name="l00328"></a>00328     png_writer(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename) : file_mgr(filename, <span class="stringliteral">"wb"</span>) { init(); }
 364 <a name="l00329"></a>00329
 365 <a name="l00330"></a>00330     ~png_writer() {
 366 <a name="l00331"></a>00331         png_destroy_write_struct(&amp;_png_ptr,&amp;_info_ptr);
 367 <a name="l00332"></a>00332     }
 368 <a name="l00333"></a>00333     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
 369 <a name="l00334"></a>00334     <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View&amp; view) {
 370 <a name="l00335"></a>00335         png_set_IHDR(_png_ptr, _info_ptr, view.width(), view.height(),
 371 <a name="l00336"></a>00336                      png_write_support_private&lt;typename channel_type&lt;View&gt;::type,
 372 <a name="l00337"></a>00337                                                <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::bit_depth,
 373 <a name="l00338"></a>00338                      png_write_support_private&lt;typename channel_type&lt;View&gt;::type,
 374 <a name="l00339"></a>00339                                                <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::color_type,
 375 <a name="l00340"></a>00340                      PNG_INTERLACE_NONE,
 376 <a name="l00341"></a>00341                      PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
 377 <a name="l00342"></a>00342         png_write_info(_png_ptr,_info_ptr);
 378 <a name="l00343"></a>00343         <span class="keywordflow">if</span> (little_endian() &amp;&amp;
 379 <a name="l00344"></a>00344             png_write_support_private&lt;<span class="keyword">typename</span> channel_type&lt;View&gt;::type,
 380 <a name="l00345"></a>00345                                       <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::bit_depth&gt;8)
 381 <a name="l00346"></a>00346             png_set_swap(_png_ptr);
 382 <a name="l00347"></a>00347         std::vector&lt;pixel&lt;typename channel_type&lt;View&gt;::type,
 383 <a name="l00348"></a>00348                           layout&lt;typename color_space_type&lt;View&gt;::type&gt; &gt; &gt; row(view.width());
 384 <a name="l00349"></a>00349         <span class="keywordflow">for</span>(<span class="keywordtype">int</span> y=0;y&lt;view.height();++y) {
 385 <a name="l00350"></a>00350             <a class="code" href="g_i_l_0214.html#g4e8a9e1bb08e76c93dc56a4626231ee1" title="Copy when both src and dst are planar pointers is copy for each channel.">std::copy</a>(view.row_begin(y),view.row_end(y),row.begin());
 386 <a name="l00351"></a>00351             png_write_row(_png_ptr,(png_bytep)&amp;row.front());
 387 <a name="l00352"></a>00352         }
 388 <a name="l00353"></a>00353         png_write_end(_png_ptr,_info_ptr);
 389 <a name="l00354"></a>00354     }
 390 <a name="l00355"></a>00355 };
 391 <a name="l00356"></a>00356
 392 <a name="l00357"></a>00357 } <span class="comment">// namespace detail</span>
 393 <a name="l00358"></a>00358 } }  <span class="comment">// namespace boost::gil</span>
 394 <a name="l00359"></a>00359
 395 <a name="l00360"></a>00360 <span class="preprocessor">#endif</span>
 396 </pre></div></div>
 397 <hr size="1"><address style="text-align: right;"><small>Generated on Sat May 2 13:50:15 2009 for Generic Image Library by&nbsp;
 398 <a href="http://www.doxygen.org/index.html">
 399 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
 400 </body>
 401 </html>