/Src/Dependencies/Boost/libs/gil/doc/html/g_i_l_0253.html
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1<!-- Copyright 2008 Lubomir Bourdev and Hailin Jin 2 3 Distributed under the Boost Software License, Version 1.0. 4 (See accompanying file LICENSE_1_0.txt or copy at 5 http://www.boost.org/LICENSE_1_0.txt) 6 --> 7 8<!-- 9 Copyright 2005-2007 Adobe Systems Incorporated 10 Distributed under the MIT License (see accompanying file LICENSE_1_0_0.txt 11 or a copy at http://stlab.adobe.com/licenses.html) 12 13 Some files are held under additional license. 14 Please see "http://stlab.adobe.com/licenses.html" for more information. 15--> 16 17<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 18 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 19<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> 20 21<head> 22 <TITLE>Generic Image Library: png_io_private.hpp Source File</TITLE> 23 <META HTTP-EQUIV="content-type" CONTENT="text/html;charset=ISO-8859-1"/> 24 <LINK TYPE="text/css" REL="stylesheet" HREF="adobe_source.css"/> 25</head> 26<body> 27<table border="0" cellspacing="0" cellpadding="0" style='width: 100%; margin: 0; padding: 0'><tr> 28<td width="100%" valign="top" style='padding-left: 10px; padding-right: 10px; padding-bottom: 10px'> 29<div class="qindex"><a class="qindex" href="index.html">Modules</a> 30 | <a class="qindex" href="classes.html">Alphabetical List</a> 31 | <a class="qindex" href="annotated.html">Class List</a> 32 | <a class="qindex" href="dirs.html">Directories</a> 33 | <a class="qindex" href="files.html">File List</a> 34 | <a class="qindex" href="../index.html">GIL Home Page</a> 35</div> 36<!-- End Header --> 37<!-- Generated by Doxygen 1.5.6 --> 38 <div class="navpath"><a class="el" href="g_i_l_0076.html">boost</a> » <a class="el" href="g_i_l_0079.html">gil</a> » <a class="el" href="g_i_l_0078.html">extension</a> » <a class="el" href="g_i_l_0077.html">io</a> 39 </div> 40<div class="contents"> 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 <algorithm></span> 57<a name="l00022"></a>00022 <span class="preprocessor">#include <vector></span> 58<a name="l00023"></a>00023 <span class="preprocessor">#include <boost/static_assert.hpp></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 <png.h></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> <<span class="keyword">typename</span> Cs> <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><> <span class="keyword">struct </span>png_color_type<gray_t> { 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><> <span class="keyword">struct </span>png_color_type<rgb_t> { 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><> <span class="keyword">struct </span>png_color_type<rgba_t> { 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> <<span class="keyword">typename</span> Channel,<span class="keyword">typename</span> ColorSpace> <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> <> <span class="keyword">struct </span>png_is_supported<bits8,gray_t> {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> <> <span class="keyword">struct </span>png_is_supported<bits8,rgb_t> {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> <> <span class="keyword">struct </span>png_is_supported<bits8,rgba_t> {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> <> <span class="keyword">struct </span>png_is_supported<bits16,gray_t> {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> <> <span class="keyword">struct </span>png_is_supported<bits16,rgb_t> {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> <> <span class="keyword">struct </span>png_is_supported<bits16,rgba_t> {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> <<span class="keyword">typename</span> Channel> <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> <<span class="keyword">typename</span> Channel,<span class="keyword">typename</span> ColorSpace> 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> <> 92<a name="l00057"></a>00057 <span class="keyword">struct </span>png_read_support_private<bits8,gray_t> { 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> <> 98<a name="l00063"></a>00063 <span class="keyword">struct </span>png_read_support_private<bits8,rgb_t> { 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> <> 104<a name="l00069"></a>00069 <span class="keyword">struct </span>png_read_support_private<bits8,rgba_t> { 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> <> 110<a name="l00075"></a>00075 <span class="keyword">struct </span>png_read_support_private<bits16,gray_t> { 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> <> 116<a name="l00081"></a>00081 <span class="keyword">struct </span>png_read_support_private<bits16,rgb_t> { 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> <> 122<a name="l00087"></a>00087 <span class="keyword">struct </span>png_read_support_private<bits16,rgba_t> { 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> <<span class="keyword">typename</span> Channel,<span class="keyword">typename</span> ColorSpace> 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> <> 135<a name="l00100"></a>00100 <span class="keyword">struct </span>png_write_support_private<bits8,gray_t> { 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> <> 141<a name="l00106"></a>00106 <span class="keyword">struct </span>png_write_support_private<bits8,rgb_t> { 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> <> 147<a name="l00112"></a>00112 <span class="keyword">struct </span>png_write_support_private<bits8,rgba_t> { 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> <> 153<a name="l00118"></a>00118 <span class="keyword">struct </span>png_write_support_private<bits16,gray_t> { 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> <> 159<a name="l00124"></a>00124 <span class="keyword">struct </span>png_write_support_private<bits16,rgb_t> { 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> <> 165<a name="l00130"></a>00130 <span class="keyword">struct </span>png_write_support_private<bits16,rgba_t> { 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(&_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(&_png_ptr, &_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() && png_get_bit_depth(_png_ptr,_info_ptr)>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(&_png_ptr,&_info_ptr,png_infopp_NULL); 210<a name="l00175"></a>00175 } 211<a name="l00176"></a>00176 point2<std::ptrdiff_t> get_dimensions() { 212<a name="l00177"></a>00177 <span class="keywordflow">return</span> point2<std::ptrdiff_t>(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> <<span class="keyword">typename</span> View> 216<a name="l00181"></a>00181 <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View& <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 &width, &height,&bit_depth,&color_type,&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<<span class="keyword">typename</span> channel_type<View>::type, 226<a name="l00191"></a>00191 <span class="keyword">typename</span> color_space_type<View>::type>::bit_depth!=bit_depth || 227<a name="l00192"></a>00192 png_read_support_private<<span class="keyword">typename</span> channel_type<View>::type, 228<a name="l00193"></a>00193 <span class="keyword">typename</span> color_space_type<View>::type>::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<pixel<typename channel_type<View>::type, 232<a name="l00197"></a>00197 layout<typename color_space_type<View>::type> > > row(width); 233<a name="l00198"></a>00198 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) { 234<a name="l00199"></a>00199 png_read_row(_png_ptr,(png_bytep)&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> <<span class="keyword">typename</span> Image> 241<a name="l00206"></a>00206 <span class="keywordtype">void</span> read_image(Image& 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> <<span class="keyword">typename</span> CC> 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> <<span class="keyword">typename</span> View> 258<a name="l00223"></a>00223 <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View& 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 &width, &height,&bit_depth,&color_type,&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<gray8_pixel_t> row(width); 271<a name="l00236"></a>00236 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) { 272<a name="l00237"></a>00237 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL); 273<a name="l00238"></a>00238 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<gray8_ref_t,typename View::value_type,CC>(_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<gray16_pixel_t> row(width); 279<a name="l00244"></a>00244 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) { 280<a name="l00245"></a>00245 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL); 281<a name="l00246"></a>00246 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<gray16_ref_t,typename View::value_type,CC>(_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<rgb8_pixel_t> row(width); 292<a name="l00257"></a>00257 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) { 293<a name="l00258"></a>00258 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL); 294<a name="l00259"></a>00259 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgb8_ref_t,typename View::value_type,CC>(_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<rgb16_pixel_t> row(width); 300<a name="l00265"></a>00265 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) { 301<a name="l00266"></a>00266 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL); 302<a name="l00267"></a>00267 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgb16_ref_t,typename View::value_type,CC>(_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<rgba8_pixel_t> row(width); 313<a name="l00278"></a>00278 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) { 314<a name="l00279"></a>00279 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL); 315<a name="l00280"></a>00280 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgba8_ref_t,typename View::value_type,CC>(_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<rgba16_pixel_t> row(width); 321<a name="l00286"></a>00286 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) { 322<a name="l00287"></a>00287 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL); 323<a name="l00288"></a>00288 std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgba16_ref_t,typename View::value_type,CC>(_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> <<span class="keyword">typename</span> Image> 335<a name="l00300"></a>00300 <span class="keywordtype">void</span> read_image(Image& 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(&_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(&_png_ptr, &_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(&_png_ptr,&_info_ptr); 367<a name="l00332"></a>00332 } 368<a name="l00333"></a>00333 <span class="keyword">template</span> <<span class="keyword">typename</span> View> 369<a name="l00334"></a>00334 <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View& 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<typename channel_type<View>::type, 372<a name="l00337"></a>00337 <span class="keyword">typename</span> color_space_type<View>::type>::bit_depth, 373<a name="l00338"></a>00338 png_write_support_private<typename channel_type<View>::type, 374<a name="l00339"></a>00339 <span class="keyword">typename</span> color_space_type<View>::type>::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() && 379<a name="l00344"></a>00344 png_write_support_private<<span class="keyword">typename</span> channel_type<View>::type, 380<a name="l00345"></a>00345 <span class="keyword">typename</span> color_space_type<View>::type>::bit_depth>8) 381<a name="l00346"></a>00346 png_set_swap(_png_ptr); 382<a name="l00347"></a>00347 std::vector<pixel<typename channel_type<View>::type, 383<a name="l00348"></a>00348 layout<typename color_space_type<View>::type> > > row(view.width()); 384<a name="l00349"></a>00349 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> y=0;y<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)&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 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>