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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>&nbsp;&raquo&nbsp;<a class="el" href="g_i_l_0078.html">extension</a>&nbsp;&raquo&nbsp;<a class="el" href="g_i_l_0077.html">io</a>
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    41. 

  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. 

  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://stlab.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 <span class="comment">/*************************************************************************************************/</span>
    51. 

  51. <a name="l00011"></a>00011 
    52. 

  52. <a name="l00012"></a>00012 <span class="preprocessor">#ifndef GIL_PNG_IO_PRIVATE_H</span>
    53. 

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

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

  55. <a name="l00020"></a>00020 
    56. 

  56. <a name="l00021"></a>00021 <span class="preprocessor">#include &lt;algorithm&gt;</span>
    57. 

  57. <a name="l00022"></a>00022 <span class="preprocessor">#include &lt;vector&gt;</span>
    58. 

  58. <a name="l00023"></a>00023 <span class="preprocessor">#include &lt;boost/static_assert.hpp&gt;</span>
    59. 

  59. <a name="l00024"></a>00024 <span class="preprocessor">#include "../../gil_all.hpp"</span>
    60. 

  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. 

  61. <a name="l00026"></a>00026 <span class="preprocessor">#include &lt;png.h&gt;</span>
    62. 

  62. <a name="l00027"></a>00027 
    63. 

  63. <a name="l00028"></a>00028 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
    64. 

  64. <a name="l00029"></a>00029 
    65. 

  65. <a name="l00030"></a>00030 <span class="keyword">namespace </span>detail {
    66. 

  66. <a name="l00031"></a>00031 
    67. 

  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. 

  68. <a name="l00033"></a>00033 
    69. 

  69. <a name="l00034"></a>00034 <span class="comment">// lbourdev: These can be greatly simplified, for example:</span>
    70. 

  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. 

  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. 

  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. 

  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. 

  74. <a name="l00039"></a>00039 
    75. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  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. 

  82. <a name="l00047"></a>00047 
    83. 

  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. 

  84. <a name="l00049"></a>00049 
    85. 

  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. 

  86. <a name="l00051"></a>00051 <span class="keyword">struct </span>png_read_support_private {
    87. 

  87. <a name="l00052"></a>00052     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">false</span>);
    88. 

  88. <a name="l00053"></a>00053     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=0);
    89. 

  89. <a name="l00054"></a>00054     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=0);
    90. 

  90. <a name="l00055"></a>00055 };
    91. 

  91. <a name="l00056"></a>00056 <span class="keyword">template</span> &lt;&gt;
    92. 

  92. <a name="l00057"></a>00057 <span class="keyword">struct </span>png_read_support_private&lt;bits8,gray_t&gt; {
    93. 

  93. <a name="l00058"></a>00058     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    94. 

  94. <a name="l00059"></a>00059     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
    95. 

  95. <a name="l00060"></a>00060     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
    96. 

  96. <a name="l00061"></a>00061 };
    97. 

  97. <a name="l00062"></a>00062 <span class="keyword">template</span> &lt;&gt;
    98. 

  98. <a name="l00063"></a>00063 <span class="keyword">struct </span>png_read_support_private&lt;bits8,rgb_t&gt; {
    99. 

  99. <a name="l00064"></a>00064     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    100. 

  100. <a name="l00065"></a>00065     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
    101. 

  101. <a name="l00066"></a>00066     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
    102. 

  102. <a name="l00067"></a>00067 };
    103. 

  103. <a name="l00068"></a>00068 <span class="keyword">template</span> &lt;&gt;
    104. 

  104. <a name="l00069"></a>00069 <span class="keyword">struct </span>png_read_support_private&lt;bits8,rgba_t&gt; {
    105. 

  105. <a name="l00070"></a>00070     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    106. 

  106. <a name="l00071"></a>00071     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
    107. 

  107. <a name="l00072"></a>00072     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
    108. 

  108. <a name="l00073"></a>00073 };
    109. 

  109. <a name="l00074"></a>00074 <span class="keyword">template</span> &lt;&gt;
    110. 

  110. <a name="l00075"></a>00075 <span class="keyword">struct </span>png_read_support_private&lt;bits16,gray_t&gt; {
    111. 

  111. <a name="l00076"></a>00076     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    112. 

  112. <a name="l00077"></a>00077     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
    113. 

  113. <a name="l00078"></a>00078     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
    114. 

  114. <a name="l00079"></a>00079 };
    115. 

  115. <a name="l00080"></a>00080 <span class="keyword">template</span> &lt;&gt;
    116. 

  116. <a name="l00081"></a>00081 <span class="keyword">struct </span>png_read_support_private&lt;bits16,rgb_t&gt; {
    117. 

  117. <a name="l00082"></a>00082     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    118. 

  118. <a name="l00083"></a>00083     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
    119. 

  119. <a name="l00084"></a>00084     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
    120. 

  120. <a name="l00085"></a>00085 };
    121. 

  121. <a name="l00086"></a>00086 <span class="keyword">template</span> &lt;&gt;
    122. 

  122. <a name="l00087"></a>00087 <span class="keyword">struct </span>png_read_support_private&lt;bits16,rgba_t&gt; {
    123. 

  123. <a name="l00088"></a>00088     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    124. 

  124. <a name="l00089"></a>00089     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
    125. 

  125. <a name="l00090"></a>00090     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
    126. 

  126. <a name="l00091"></a>00091 };
    127. 

  127. <a name="l00092"></a>00092 
    128. 

  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. 

  129. <a name="l00094"></a>00094 <span class="keyword">struct </span>png_write_support_private {
    130. 

  130. <a name="l00095"></a>00095     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">false</span>);
    131. 

  131. <a name="l00096"></a>00096     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=0);
    132. 

  132. <a name="l00097"></a>00097     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=0);
    133. 

  133. <a name="l00098"></a>00098 };
    134. 

  134. <a name="l00099"></a>00099 <span class="keyword">template</span> &lt;&gt;
    135. 

  135. <a name="l00100"></a>00100 <span class="keyword">struct </span>png_write_support_private&lt;bits8,gray_t&gt; {
    136. 

  136. <a name="l00101"></a>00101     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    137. 

  137. <a name="l00102"></a>00102     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
    138. 

  138. <a name="l00103"></a>00103     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
    139. 

  139. <a name="l00104"></a>00104 };
    140. 

  140. <a name="l00105"></a>00105 <span class="keyword">template</span> &lt;&gt;
    141. 

  141. <a name="l00106"></a>00106 <span class="keyword">struct </span>png_write_support_private&lt;bits8,rgb_t&gt; {
    142. 

  142. <a name="l00107"></a>00107     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    143. 

  143. <a name="l00108"></a>00108     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
    144. 

  144. <a name="l00109"></a>00109     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
    145. 

  145. <a name="l00110"></a>00110 };
    146. 

  146. <a name="l00111"></a>00111 <span class="keyword">template</span> &lt;&gt;
    147. 

  147. <a name="l00112"></a>00112 <span class="keyword">struct </span>png_write_support_private&lt;bits8,rgba_t&gt; {
    148. 

  148. <a name="l00113"></a>00113     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    149. 

  149. <a name="l00114"></a>00114     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
    150. 

  150. <a name="l00115"></a>00115     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
    151. 

  151. <a name="l00116"></a>00116 };
    152. 

  152. <a name="l00117"></a>00117 <span class="keyword">template</span> &lt;&gt;
    153. 

  153. <a name="l00118"></a>00118 <span class="keyword">struct </span>png_write_support_private&lt;bits16,gray_t&gt; {
    154. 

  154. <a name="l00119"></a>00119     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    155. 

  155. <a name="l00120"></a>00120     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
    156. 

  156. <a name="l00121"></a>00121     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
    157. 

  157. <a name="l00122"></a>00122 };
    158. 

  158. <a name="l00123"></a>00123 <span class="keyword">template</span> &lt;&gt;
    159. 

  159. <a name="l00124"></a>00124 <span class="keyword">struct </span>png_write_support_private&lt;bits16,rgb_t&gt; {
    160. 

  160. <a name="l00125"></a>00125     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    161. 

  161. <a name="l00126"></a>00126     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
    162. 

  162. <a name="l00127"></a>00127     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
    163. 

  163. <a name="l00128"></a>00128 };
    164. 

  164. <a name="l00129"></a>00129 <span class="keyword">template</span> &lt;&gt;
    165. 

  165. <a name="l00130"></a>00130 <span class="keyword">struct </span>png_write_support_private&lt;bits16,rgba_t&gt; {
    166. 

  166. <a name="l00131"></a>00131     BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
    167. 

  167. <a name="l00132"></a>00132     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
    168. 

  168. <a name="l00133"></a>00133     BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
    169. 

  169. <a name="l00134"></a>00134 };
    170. 

  170. <a name="l00135"></a>00135 
    171. 

  171. <a name="l00136"></a>00136 <span class="keyword">class </span>png_reader : <span class="keyword">public</span> file_mgr {
    172. 

  172. <a name="l00137"></a>00137 <span class="keyword">protected</span>:
    173. 

  173. <a name="l00138"></a>00138     png_structp _png_ptr;
    174. 

  174. <a name="l00139"></a>00139     png_infop _info_ptr;
    175. 

  175. <a name="l00140"></a>00140 
    176. 

  176. <a name="l00141"></a>00141     <span class="keywordtype">void</span> init() {
    177. 

  177. <a name="l00142"></a>00142         <span class="keywordtype">char</span> buf[PNG_BYTES_TO_CHECK];
    178. 

  178. <a name="l00143"></a>00143         <span class="comment">// read in some of the signature bytes</span>
    179. 

  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. 

  180. <a name="l00145"></a>00145                     <span class="stringliteral">"png_check_validity: fail to read file"</span>);
    181. 

  181. <a name="l00146"></a>00146         <span class="comment">// compare the first PNG_BYTES_TO_CHECK bytes of the signature.</span>
    182. 

  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. 

  183. <a name="l00148"></a>00148                     <span class="stringliteral">"png_check_validity: invalid png file"</span>);
    184. 

  184. <a name="l00149"></a>00149 
    185. 

  185. <a name="l00150"></a>00150         _png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
    186. 

  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. 

  187. <a name="l00152"></a>00152         <span class="comment">// allocate/initialize the image information data</span>
    188. 

  188. <a name="l00153"></a>00153         _info_ptr = png_create_info_struct(_png_ptr);
    189. 

  189. <a name="l00154"></a>00154         <span class="keywordflow">if</span> (_info_ptr == NULL) {
    190. 

  190. <a name="l00155"></a>00155             png_destroy_read_struct(&amp;_png_ptr,png_infopp_NULL,png_infopp_NULL);
    191. 

  191. <a name="l00156"></a>00156             io_error(<span class="stringliteral">"png_get_file_size: fail to call png_create_info_struct()"</span>);
    192. 

  192. <a name="l00157"></a>00157         }
    193. 

  193. <a name="l00158"></a>00158         <span class="keywordflow">if</span> (setjmp(png_jmpbuf(_png_ptr))) {
    194. 

  194. <a name="l00159"></a>00159             <span class="comment">//free all of the memory associated with the png_ptr and info_ptr</span>
    195. 

  195. <a name="l00160"></a>00160             png_destroy_read_struct(&amp;_png_ptr, &amp;_info_ptr, png_infopp_NULL);
    196. 

  196. <a name="l00161"></a>00161             io_error(<span class="stringliteral">"png_get_file_size: fail to call setjmp()"</span>);
    197. 

  197. <a name="l00162"></a>00162         }
    198. 

  198. <a name="l00163"></a>00163         png_init_io(_png_ptr, <span class="keyword">get</span>());
    199. 

  199. <a name="l00164"></a>00164         png_set_sig_bytes(_png_ptr,PNG_BYTES_TO_CHECK);
    200. 

  200. <a name="l00165"></a>00165         png_read_info(_png_ptr, _info_ptr);
    201. 

  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. 

  202. <a name="l00167"></a>00167             png_set_swap(_png_ptr);
    203. 

  203. <a name="l00168"></a>00168     }
    204. 

  204. <a name="l00169"></a>00169 <span class="keyword">public</span>:
    205. 

  205. <a name="l00170"></a>00170     png_reader(FILE* file          ) : file_mgr(file)           { init(); }
    206. 

  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. 

  207. <a name="l00172"></a>00172 
    208. 

  208. <a name="l00173"></a>00173     ~png_reader() {
    209. 

  209. <a name="l00174"></a>00174         png_destroy_read_struct(&amp;_png_ptr,&amp;_info_ptr,png_infopp_NULL);
    210. 

  210. <a name="l00175"></a>00175     }
    211. 

  211. <a name="l00176"></a>00176     point2&lt;std::ptrdiff_t&gt; get_dimensions() {
    212. 

  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. 

  213. <a name="l00178"></a>00178                                       png_get_image_height(_png_ptr,_info_ptr));
    214. 

  214. <a name="l00179"></a>00179     }
    215. 

  215. <a name="l00180"></a>00180     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    216. 

  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. 

  217. <a name="l00182"></a>00182         png_uint_32 width, height;
    218. 

  218. <a name="l00183"></a>00183         <span class="keywordtype">int</span> bit_depth, color_type, interlace_type;
    219. 

  219. <a name="l00184"></a>00184         png_get_IHDR(_png_ptr, _info_ptr,
    220. 

  220. <a name="l00185"></a>00185                      &amp;width, &amp;height,&amp;bit_depth,&amp;color_type,&amp;interlace_type,
    221. 

  221. <a name="l00186"></a>00186                      int_p_NULL, int_p_NULL);
    222. 

  222. <a name="l00187"></a>00187         io_error_if(((png_uint_32)view.width()!=width || (png_uint_32)view.height()!= height),
    223. 

  223. <a name="l00188"></a>00188                     <span class="stringliteral">"png_read_view: input view size does not match PNG file size"</span>);
    224. 

  224. <a name="l00189"></a>00189         
    225. 

  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. 

  226. <a name="l00191"></a>00191                                     <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::bit_depth!=bit_depth ||
    227. 

  227. <a name="l00192"></a>00192            png_read_support_private&lt;<span class="keyword">typename</span> channel_type&lt;View&gt;::type,
    228. 

  228. <a name="l00193"></a>00193                                     <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::color_type!=color_type)
    229. 

  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. 

  230. <a name="l00195"></a>00195         
    231. 

  231. <a name="l00196"></a>00196         std::vector&lt;pixel&lt;typename channel_type&lt;View&gt;::type,
    232. 

  232. <a name="l00197"></a>00197                           layout&lt;typename color_space_type&lt;View&gt;::type&gt; &gt; &gt; row(width);
    233. 

  233. <a name="l00198"></a>00198         <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
    234. 

  234. <a name="l00199"></a>00199             png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
    235. 

  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. 

  236. <a name="l00201"></a>00201         }
    237. 

  237. <a name="l00202"></a>00202         png_read_end(_png_ptr,NULL);
    238. 

  238. <a name="l00203"></a>00203     }
    239. 

  239. <a name="l00204"></a>00204 
    240. 

  240. <a name="l00205"></a>00205     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Image&gt;
    241. 

  241. <a name="l00206"></a>00206     <span class="keywordtype">void</span> read_image(Image&amp; im) {
    242. 

  242. <a name="l00207"></a>00207         im.recreate(get_dimensions());
    243. 

  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. 

  244. <a name="l00209"></a>00209     }
    245. 

  245. <a name="l00210"></a>00210 };
    246. 

  246. <a name="l00211"></a>00211 
    247. 

  247. <a name="l00212"></a>00212 <span class="comment">// This code will be simplified...</span>
    248. 

  248. <a name="l00213"></a>00213 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> CC&gt;
    249. 

  249. <a name="l00214"></a>00214 <span class="keyword">class </span>png_reader_color_convert : <span class="keyword">public</span> png_reader {
    250. 

  250. <a name="l00215"></a>00215 <span class="keyword">private</span>:
    251. 

  251. <a name="l00216"></a>00216     CC _cc;
    252. 

  252. <a name="l00217"></a>00217 <span class="keyword">public</span>:
    253. 

  253. <a name="l00218"></a>00218     png_reader_color_convert(FILE* file          ,CC cc_in) : png_reader(file),_cc(cc_in) {}
    254. 

  254. <a name="l00219"></a>00219     png_reader_color_convert(FILE* file          ) : png_reader(file) {}
    255. 

  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. 

  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. 

  257. <a name="l00222"></a>00222     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    258. 

  258. <a name="l00223"></a>00223     <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View&amp; view) {
    259. 

  259. <a name="l00224"></a>00224         png_uint_32 width, height;
    260. 

  260. <a name="l00225"></a>00225         <span class="keywordtype">int</span> bit_depth, color_type, interlace_type;
    261. 

  261. <a name="l00226"></a>00226         png_get_IHDR(_png_ptr, _info_ptr,
    262. 

  262. <a name="l00227"></a>00227                      &amp;width, &amp;height,&amp;bit_depth,&amp;color_type,&amp;interlace_type,
    263. 

  263. <a name="l00228"></a>00228                      int_p_NULL, int_p_NULL);
    264. 

  264. <a name="l00229"></a>00229         io_error_if(((png_uint_32)view.width()!=width || (png_uint_32)view.height()!= height),
    265. 

  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. 

  266. <a name="l00231"></a>00231         <span class="keywordflow">switch</span> (color_type) {
    267. 

  267. <a name="l00232"></a>00232         <span class="keywordflow">case</span> PNG_COLOR_TYPE_GRAY:
    268. 

  268. <a name="l00233"></a>00233             <span class="keywordflow">switch</span> (bit_depth) {
    269. 

  269. <a name="l00234"></a>00234             <span class="keywordflow">case</span> 8: {
    270. 

  270. <a name="l00235"></a>00235                 std::vector&lt;gray8_pixel_t&gt; row(width);
    271. 

  271. <a name="l00236"></a>00236                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
    272. 

  272. <a name="l00237"></a>00237                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
    273. 

  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. 

  274. <a name="l00239"></a>00239                 }
    275. 

  275. <a name="l00240"></a>00240                 <span class="keywordflow">break</span>;
    276. 

  276. <a name="l00241"></a>00241             }
    277. 

  277. <a name="l00242"></a>00242             <span class="keywordflow">case</span> 16: {
    278. 

  278. <a name="l00243"></a>00243                 std::vector&lt;gray16_pixel_t&gt; row(width);
    279. 

  279. <a name="l00244"></a>00244                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
    280. 

  280. <a name="l00245"></a>00245                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
    281. 

  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. 

  282. <a name="l00247"></a>00247                 }
    283. 

  283. <a name="l00248"></a>00248                 <span class="keywordflow">break</span>;
    284. 

  284. <a name="l00249"></a>00249             }
    285. 

  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. 

  286. <a name="l00251"></a>00251             }
    287. 

  287. <a name="l00252"></a>00252             <span class="keywordflow">break</span>;
    288. 

  288. <a name="l00253"></a>00253         <span class="keywordflow">case</span> PNG_COLOR_TYPE_RGB:
    289. 

  289. <a name="l00254"></a>00254             <span class="keywordflow">switch</span> (bit_depth) {
    290. 

  290. <a name="l00255"></a>00255             <span class="keywordflow">case</span> 8: {
    291. 

  291. <a name="l00256"></a>00256                 std::vector&lt;rgb8_pixel_t&gt; row(width);
    292. 

  292. <a name="l00257"></a>00257                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
    293. 

  293. <a name="l00258"></a>00258                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
    294. 

  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. 

  295. <a name="l00260"></a>00260                 }
    296. 

  296. <a name="l00261"></a>00261                 <span class="keywordflow">break</span>;
    297. 

  297. <a name="l00262"></a>00262             }
    298. 

  298. <a name="l00263"></a>00263             <span class="keywordflow">case</span> 16: {
    299. 

  299. <a name="l00264"></a>00264                 std::vector&lt;rgb16_pixel_t&gt; row(width);
    300. 

  300. <a name="l00265"></a>00265                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
    301. 

  301. <a name="l00266"></a>00266                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
    302. 

  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. 

  303. <a name="l00268"></a>00268                 }
    304. 

  304. <a name="l00269"></a>00269                 <span class="keywordflow">break</span>;
    305. 

  305. <a name="l00270"></a>00270             }
    306. 

  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. 

  307. <a name="l00272"></a>00272             }
    308. 

  308. <a name="l00273"></a>00273             <span class="keywordflow">break</span>;
    309. 

  309. <a name="l00274"></a>00274         <span class="keywordflow">case</span> PNG_COLOR_TYPE_RGBA:
    310. 

  310. <a name="l00275"></a>00275             <span class="keywordflow">switch</span> (bit_depth) {
    311. 

  311. <a name="l00276"></a>00276             <span class="keywordflow">case</span> 8: {
    312. 

  312. <a name="l00277"></a>00277                 std::vector&lt;rgba8_pixel_t&gt; row(width);
    313. 

  313. <a name="l00278"></a>00278                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
    314. 

  314. <a name="l00279"></a>00279                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
    315. 

  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. 

  316. <a name="l00281"></a>00281                 }
    317. 

  317. <a name="l00282"></a>00282                 <span class="keywordflow">break</span>;
    318. 

  318. <a name="l00283"></a>00283             }
    319. 

  319. <a name="l00284"></a>00284             <span class="keywordflow">case</span> 16: {
    320. 

  320. <a name="l00285"></a>00285                 std::vector&lt;rgba16_pixel_t&gt; row(width);
    321. 

  321. <a name="l00286"></a>00286                 <span class="keywordflow">for</span>(png_uint_32 y=0;y&lt;height;++y) {
    322. 

  322. <a name="l00287"></a>00287                     png_read_row(_png_ptr,(png_bytep)&amp;row.front(),NULL);
    323. 

  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. 

  324. <a name="l00289"></a>00289                 }
    325. 

  325. <a name="l00290"></a>00290                 <span class="keywordflow">break</span>;
    326. 

  326. <a name="l00291"></a>00291             }
    327. 

  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. 

  328. <a name="l00293"></a>00293             }
    329. 

  329. <a name="l00294"></a>00294             <span class="keywordflow">break</span>;
    330. 

  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. 

  331. <a name="l00296"></a>00296         }
    332. 

  332. <a name="l00297"></a>00297         png_read_end(_png_ptr,NULL);
    333. 

  333. <a name="l00298"></a>00298     }
    334. 

  334. <a name="l00299"></a>00299     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Image&gt;
    335. 

  335. <a name="l00300"></a>00300     <span class="keywordtype">void</span> read_image(Image&amp; im) {
    336. 

  336. <a name="l00301"></a>00301         im.recreate(get_dimensions());
    337. 

  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. 

  338. <a name="l00303"></a>00303     }
    339. 

  339. <a name="l00304"></a>00304 };
    340. 

  340. <a name="l00305"></a>00305 
    341. 

  341. <a name="l00306"></a>00306 
    342. 

  342. <a name="l00307"></a>00307 <span class="keyword">class </span>png_writer : <span class="keyword">public</span> file_mgr {
    343. 

  343. <a name="l00308"></a>00308 <span class="keyword">protected</span>:
    344. 

  344. <a name="l00309"></a>00309     png_structp _png_ptr;
    345. 

  345. <a name="l00310"></a>00310     png_infop _info_ptr;
    346. 

  346. <a name="l00311"></a>00311 
    347. 

  347. <a name="l00312"></a>00312     <span class="keywordtype">void</span> init() {
    348. 

  348. <a name="l00313"></a>00313         _png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
    349. 

  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. 

  350. <a name="l00315"></a>00315         _info_ptr = png_create_info_struct(_png_ptr);
    351. 

  351. <a name="l00316"></a>00316         <span class="keywordflow">if</span> (!_info_ptr) {
    352. 

  352. <a name="l00317"></a>00317             png_destroy_write_struct(&amp;_png_ptr,png_infopp_NULL);
    353. 

  353. <a name="l00318"></a>00318             io_error(<span class="stringliteral">"png_write_initialize: fail to call png_create_info_struct()"</span>);
    354. 

  354. <a name="l00319"></a>00319         }
    355. 

  355. <a name="l00320"></a>00320         <span class="keywordflow">if</span> (setjmp(png_jmpbuf(_png_ptr))) {
    356. 

  356. <a name="l00321"></a>00321             png_destroy_write_struct(&amp;_png_ptr, &amp;_info_ptr);
    357. 

  357. <a name="l00322"></a>00322             io_error(<span class="stringliteral">"png_write_initialize: fail to call setjmp(png_jmpbuf())"</span>);
    358. 

  358. <a name="l00323"></a>00323         }
    359. 

  359. <a name="l00324"></a>00324         png_init_io(_png_ptr,<span class="keyword">get</span>());
    360. 

  360. <a name="l00325"></a>00325     }
    361. 

  361. <a name="l00326"></a>00326 <span class="keyword">public</span>:
    362. 

  362. <a name="l00327"></a>00327     png_writer(FILE* file          ) : file_mgr(file)           { init(); }
    363. 

  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. 

  364. <a name="l00329"></a>00329 
    365. 

  365. <a name="l00330"></a>00330     ~png_writer() {
    366. 

  366. <a name="l00331"></a>00331         png_destroy_write_struct(&amp;_png_ptr,&amp;_info_ptr);
    367. 

  367. <a name="l00332"></a>00332     }
    368. 

  368. <a name="l00333"></a>00333     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> View&gt;
    369. 

  369. <a name="l00334"></a>00334     <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View&amp; view) {
    370. 

  370. <a name="l00335"></a>00335         png_set_IHDR(_png_ptr, _info_ptr, view.width(), view.height(),
    371. 

  371. <a name="l00336"></a>00336                      png_write_support_private&lt;typename channel_type&lt;View&gt;::type,
    372. 

  372. <a name="l00337"></a>00337                                                <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::bit_depth,
    373. 

  373. <a name="l00338"></a>00338                      png_write_support_private&lt;typename channel_type&lt;View&gt;::type,
    374. 

  374. <a name="l00339"></a>00339                                                <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::color_type,
    375. 

  375. <a name="l00340"></a>00340                      PNG_INTERLACE_NONE,
    376. 

  376. <a name="l00341"></a>00341                      PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
    377. 

  377. <a name="l00342"></a>00342         png_write_info(_png_ptr,_info_ptr);
    378. 

  378. <a name="l00343"></a>00343         <span class="keywordflow">if</span> (little_endian() &amp;&amp;
    379. 

  379. <a name="l00344"></a>00344             png_write_support_private&lt;<span class="keyword">typename</span> channel_type&lt;View&gt;::type,
    380. 

  380. <a name="l00345"></a>00345                                       <span class="keyword">typename</span> color_space_type&lt;View&gt;::type&gt;::bit_depth&gt;8)
    381. 

  381. <a name="l00346"></a>00346             png_set_swap(_png_ptr);
    382. 

  382. <a name="l00347"></a>00347         std::vector&lt;pixel&lt;typename channel_type&lt;View&gt;::type,
    383. 

  383. <a name="l00348"></a>00348                           layout&lt;typename color_space_type&lt;View&gt;::type&gt; &gt; &gt; row(view.width());
    384. 

  384. <a name="l00349"></a>00349         <span class="keywordflow">for</span>(<span class="keywordtype">int</span> y=0;y&lt;view.height();++y) {
    385. 

  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. 

  386. <a name="l00351"></a>00351             png_write_row(_png_ptr,(png_bytep)&amp;row.front());
    387. 

  387. <a name="l00352"></a>00352         }
    388. 

  388. <a name="l00353"></a>00353         png_write_end(_png_ptr,_info_ptr);
    389. 

  389. <a name="l00354"></a>00354     }
    390. 

  390. <a name="l00355"></a>00355 };
    391. 

  391. <a name="l00356"></a>00356 
    392. 

  392. <a name="l00357"></a>00357 } <span class="comment">// namespace detail</span>
    393. 

  393. <a name="l00358"></a>00358 } }  <span class="comment">// namespace boost::gil</span>
    394. 

  394. <a name="l00359"></a>00359 
    395. 

  395. <a name="l00360"></a>00360 <span class="preprocessor">#endif</span>
    396. 

  396. </pre></div></div>
    397. 

  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. 

  398. <a href="http://www.doxygen.org/index.html">
    399. 

  399. <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
    400. 

  400. </body>
    401. 

  401. </html>
    402.