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<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>
<a name="l00002"></a>00002 <span class="comment"> Copyright 2005-2007 Adobe Systems Incorporated</span>
<a name="l00003"></a>00003 <span class="comment"> </span>
<a name="l00004"></a>00004 <span class="comment"> Use, modification and distribution are subject to the Boost Software License,</span>
<a name="l00005"></a>00005 <span class="comment"> Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
<a name="l00006"></a>00006 <span class="comment"> http://www.boost.org/LICENSE_1_0.txt).</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> See http://stlab.adobe.com/gil for most recent version including documentation.</span>
<a name="l00009"></a>00009 <span class="comment">*/</span>
<a name="l00010"></a>00010 <span class="comment">/*************************************************************************************************/</span>
<a name="l00011"></a>00011
<a name="l00012"></a>00012 <span class="preprocessor">#ifndef GIL_PNG_IO_PRIVATE_H</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#define GIL_PNG_IO_PRIVATE_H</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#include <algorithm></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <vector></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <boost/static_assert.hpp></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include "../../gil_all.hpp"</span>
<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>
<a name="l00026"></a>00026 <span class="preprocessor">#include <png.h></span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keyword">namespace </span>detail {
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="keyword">static</span> <span class="keyword">const</span> std::size_t PNG_BYTES_TO_CHECK = 4;
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">// lbourdev: These can be greatly simplified, for example:</span>
<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);};
<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); };
<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); };
<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); };
<a name="l00039"></a>00039
<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>);};
<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>);};
<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>);};
<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>);};
<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>);};
<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>);};
<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>);};
<a name="l00047"></a>00047
<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);};
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keyword">template</span> <<span class="keyword">typename</span> Channel,<span class="keyword">typename</span> ColorSpace>
<a name="l00051"></a>00051 <span class="keyword">struct </span>png_read_support_private {
<a name="l00052"></a>00052 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">false</span>);
<a name="l00053"></a>00053 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=0);
<a name="l00054"></a>00054 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=0);
<a name="l00055"></a>00055 };
<a name="l00056"></a>00056 <span class="keyword">template</span> <>
<a name="l00057"></a>00057 <span class="keyword">struct </span>png_read_support_private<bits8,gray_t> {
<a name="l00058"></a>00058 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00059"></a>00059 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
<a name="l00060"></a>00060 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
<a name="l00061"></a>00061 };
<a name="l00062"></a>00062 <span class="keyword">template</span> <>
<a name="l00063"></a>00063 <span class="keyword">struct </span>png_read_support_private<bits8,rgb_t> {
<a name="l00064"></a>00064 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00065"></a>00065 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
<a name="l00066"></a>00066 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
<a name="l00067"></a>00067 };
<a name="l00068"></a>00068 <span class="keyword">template</span> <>
<a name="l00069"></a>00069 <span class="keyword">struct </span>png_read_support_private<bits8,rgba_t> {
<a name="l00070"></a>00070 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00071"></a>00071 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
<a name="l00072"></a>00072 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
<a name="l00073"></a>00073 };
<a name="l00074"></a>00074 <span class="keyword">template</span> <>
<a name="l00075"></a>00075 <span class="keyword">struct </span>png_read_support_private<bits16,gray_t> {
<a name="l00076"></a>00076 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00077"></a>00077 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
<a name="l00078"></a>00078 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
<a name="l00079"></a>00079 };
<a name="l00080"></a>00080 <span class="keyword">template</span> <>
<a name="l00081"></a>00081 <span class="keyword">struct </span>png_read_support_private<bits16,rgb_t> {
<a name="l00082"></a>00082 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00083"></a>00083 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
<a name="l00084"></a>00084 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
<a name="l00085"></a>00085 };
<a name="l00086"></a>00086 <span class="keyword">template</span> <>
<a name="l00087"></a>00087 <span class="keyword">struct </span>png_read_support_private<bits16,rgba_t> {
<a name="l00088"></a>00088 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00089"></a>00089 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
<a name="l00090"></a>00090 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
<a name="l00091"></a>00091 };
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keyword">template</span> <<span class="keyword">typename</span> Channel,<span class="keyword">typename</span> ColorSpace>
<a name="l00094"></a>00094 <span class="keyword">struct </span>png_write_support_private {
<a name="l00095"></a>00095 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">false</span>);
<a name="l00096"></a>00096 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=0);
<a name="l00097"></a>00097 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=0);
<a name="l00098"></a>00098 };
<a name="l00099"></a>00099 <span class="keyword">template</span> <>
<a name="l00100"></a>00100 <span class="keyword">struct </span>png_write_support_private<bits8,gray_t> {
<a name="l00101"></a>00101 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00102"></a>00102 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
<a name="l00103"></a>00103 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
<a name="l00104"></a>00104 };
<a name="l00105"></a>00105 <span class="keyword">template</span> <>
<a name="l00106"></a>00106 <span class="keyword">struct </span>png_write_support_private<bits8,rgb_t> {
<a name="l00107"></a>00107 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00108"></a>00108 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
<a name="l00109"></a>00109 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
<a name="l00110"></a>00110 };
<a name="l00111"></a>00111 <span class="keyword">template</span> <>
<a name="l00112"></a>00112 <span class="keyword">struct </span>png_write_support_private<bits8,rgba_t> {
<a name="l00113"></a>00113 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00114"></a>00114 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=8);
<a name="l00115"></a>00115 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
<a name="l00116"></a>00116 };
<a name="l00117"></a>00117 <span class="keyword">template</span> <>
<a name="l00118"></a>00118 <span class="keyword">struct </span>png_write_support_private<bits16,gray_t> {
<a name="l00119"></a>00119 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00120"></a>00120 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
<a name="l00121"></a>00121 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_GRAY);
<a name="l00122"></a>00122 };
<a name="l00123"></a>00123 <span class="keyword">template</span> <>
<a name="l00124"></a>00124 <span class="keyword">struct </span>png_write_support_private<bits16,rgb_t> {
<a name="l00125"></a>00125 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00126"></a>00126 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
<a name="l00127"></a>00127 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGB);
<a name="l00128"></a>00128 };
<a name="l00129"></a>00129 <span class="keyword">template</span> <>
<a name="l00130"></a>00130 <span class="keyword">struct </span>png_write_support_private<bits16,rgba_t> {
<a name="l00131"></a>00131 BOOST_STATIC_CONSTANT(<span class="keywordtype">bool</span>,is_supported=<span class="keyword">true</span>);
<a name="l00132"></a>00132 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,bit_depth=16);
<a name="l00133"></a>00133 BOOST_STATIC_CONSTANT(<span class="keywordtype">int</span>,color_type=PNG_COLOR_TYPE_RGBA);
<a name="l00134"></a>00134 };
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="keyword">class </span>png_reader : <span class="keyword">public</span> file_mgr {
<a name="l00137"></a>00137 <span class="keyword">protected</span>:
<a name="l00138"></a>00138 png_structp _png_ptr;
<a name="l00139"></a>00139 png_infop _info_ptr;
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="keywordtype">void</span> init() {
<a name="l00142"></a>00142 <span class="keywordtype">char</span> buf[PNG_BYTES_TO_CHECK];
<a name="l00143"></a>00143 <span class="comment">// read in some of the signature bytes</span>
<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,
<a name="l00145"></a>00145 <span class="stringliteral">"png_check_validity: fail to read file"</span>);
<a name="l00146"></a>00146 <span class="comment">// compare the first PNG_BYTES_TO_CHECK bytes of the signature.</span>
<a name="l00147"></a>00147 io_error_if(png_sig_cmp((png_bytep)buf, (png_size_t)0, detail::PNG_BYTES_TO_CHECK)!=0,
<a name="l00148"></a>00148 <span class="stringliteral">"png_check_validity: invalid png file"</span>);
<a name="l00149"></a>00149
<a name="l00150"></a>00150 _png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
<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>);
<a name="l00152"></a>00152 <span class="comment">// allocate/initialize the image information data</span>
<a name="l00153"></a>00153 _info_ptr = png_create_info_struct(_png_ptr);
<a name="l00154"></a>00154 <span class="keywordflow">if</span> (_info_ptr == NULL) {
<a name="l00155"></a>00155 png_destroy_read_struct(&_png_ptr,png_infopp_NULL,png_infopp_NULL);
<a name="l00156"></a>00156 io_error(<span class="stringliteral">"png_get_file_size: fail to call png_create_info_struct()"</span>);
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158 <span class="keywordflow">if</span> (setjmp(png_jmpbuf(_png_ptr))) {
<a name="l00159"></a>00159 <span class="comment">//free all of the memory associated with the png_ptr and info_ptr</span>
<a name="l00160"></a>00160 png_destroy_read_struct(&_png_ptr, &_info_ptr, png_infopp_NULL);
<a name="l00161"></a>00161 io_error(<span class="stringliteral">"png_get_file_size: fail to call setjmp()"</span>);
<a name="l00162"></a>00162 }
<a name="l00163"></a>00163 png_init_io(_png_ptr, <span class="keyword">get</span>());
<a name="l00164"></a>00164 png_set_sig_bytes(_png_ptr,PNG_BYTES_TO_CHECK);
<a name="l00165"></a>00165 png_read_info(_png_ptr, _info_ptr);
<a name="l00166"></a>00166 <span class="keywordflow">if</span> (little_endian() && png_get_bit_depth(_png_ptr,_info_ptr)>8)
<a name="l00167"></a>00167 png_set_swap(_png_ptr);
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169 <span class="keyword">public</span>:
<a name="l00170"></a>00170 png_reader(FILE* file ) : file_mgr(file) { init(); }
<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(); }
<a name="l00172"></a>00172
<a name="l00173"></a>00173 ~png_reader() {
<a name="l00174"></a>00174 png_destroy_read_struct(&_png_ptr,&_info_ptr,png_infopp_NULL);
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176 point2<std::ptrdiff_t> get_dimensions() {
<a name="l00177"></a>00177 <span class="keywordflow">return</span> point2<std::ptrdiff_t>(png_get_image_width(_png_ptr,_info_ptr),
<a name="l00178"></a>00178 png_get_image_height(_png_ptr,_info_ptr));
<a name="l00179"></a>00179 }
<a name="l00180"></a>00180 <span class="keyword">template</span> <<span class="keyword">typename</span> View>
<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>) {
<a name="l00182"></a>00182 png_uint_32 width, height;
<a name="l00183"></a>00183 <span class="keywordtype">int</span> bit_depth, color_type, interlace_type;
<a name="l00184"></a>00184 png_get_IHDR(_png_ptr, _info_ptr,
<a name="l00185"></a>00185 &width, &height,&bit_depth,&color_type,&interlace_type,
<a name="l00186"></a>00186 int_p_NULL, int_p_NULL);
<a name="l00187"></a>00187 io_error_if(((png_uint_32)view.width()!=width || (png_uint_32)view.height()!= height),
<a name="l00188"></a>00188 <span class="stringliteral">"png_read_view: input view size does not match PNG file size"</span>);
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="keywordflow">if</span>(png_read_support_private<<span class="keyword">typename</span> channel_type<View>::type,
<a name="l00191"></a>00191 <span class="keyword">typename</span> color_space_type<View>::type>::bit_depth!=bit_depth ||
<a name="l00192"></a>00192 png_read_support_private<<span class="keyword">typename</span> channel_type<View>::type,
<a name="l00193"></a>00193 <span class="keyword">typename</span> color_space_type<View>::type>::color_type!=color_type)
<a name="l00194"></a>00194 io_error(<span class="stringliteral">"png_read_view: input view type is incompatible with the image type"</span>);
<a name="l00195"></a>00195
<a name="l00196"></a>00196 std::vector<pixel<typename channel_type<View>::type,
<a name="l00197"></a>00197 layout<typename color_space_type<View>::type> > > row(width);
<a name="l00198"></a>00198 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) {
<a name="l00199"></a>00199 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
<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));
<a name="l00201"></a>00201 }
<a name="l00202"></a>00202 png_read_end(_png_ptr,NULL);
<a name="l00203"></a>00203 }
<a name="l00204"></a>00204
<a name="l00205"></a>00205 <span class="keyword">template</span> <<span class="keyword">typename</span> Image>
<a name="l00206"></a>00206 <span class="keywordtype">void</span> read_image(Image& im) {
<a name="l00207"></a>00207 im.recreate(get_dimensions());
<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));
<a name="l00209"></a>00209 }
<a name="l00210"></a>00210 };
<a name="l00211"></a>00211
<a name="l00212"></a>00212 <span class="comment">// This code will be simplified...</span>
<a name="l00213"></a>00213 <span class="keyword">template</span> <<span class="keyword">typename</span> CC>
<a name="l00214"></a>00214 <span class="keyword">class </span>png_reader_color_convert : <span class="keyword">public</span> png_reader {
<a name="l00215"></a>00215 <span class="keyword">private</span>:
<a name="l00216"></a>00216 CC _cc;
<a name="l00217"></a>00217 <span class="keyword">public</span>:
<a name="l00218"></a>00218 png_reader_color_convert(FILE* file ,CC cc_in) : png_reader(file),_cc(cc_in) {}
<a name="l00219"></a>00219 png_reader_color_convert(FILE* file ) : png_reader(file) {}
<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) {}
<a name="l00221"></a>00221 png_reader_color_convert(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename) : png_reader(filename) {}
<a name="l00222"></a>00222 <span class="keyword">template</span> <<span class="keyword">typename</span> View>
<a name="l00223"></a>00223 <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View& view) {
<a name="l00224"></a>00224 png_uint_32 width, height;
<a name="l00225"></a>00225 <span class="keywordtype">int</span> bit_depth, color_type, interlace_type;
<a name="l00226"></a>00226 png_get_IHDR(_png_ptr, _info_ptr,
<a name="l00227"></a>00227 &width, &height,&bit_depth,&color_type,&interlace_type,
<a name="l00228"></a>00228 int_p_NULL, int_p_NULL);
<a name="l00229"></a>00229 io_error_if(((png_uint_32)view.width()!=width || (png_uint_32)view.height()!= height),
<a name="l00230"></a>00230 <span class="stringliteral">"png_reader_color_convert::apply(): input view size does not match PNG file size"</span>);
<a name="l00231"></a>00231 <span class="keywordflow">switch</span> (color_type) {
<a name="l00232"></a>00232 <span class="keywordflow">case</span> PNG_COLOR_TYPE_GRAY:
<a name="l00233"></a>00233 <span class="keywordflow">switch</span> (bit_depth) {
<a name="l00234"></a>00234 <span class="keywordflow">case</span> 8: {
<a name="l00235"></a>00235 std::vector<gray8_pixel_t> row(width);
<a name="l00236"></a>00236 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) {
<a name="l00237"></a>00237 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
<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));
<a name="l00239"></a>00239 }
<a name="l00240"></a>00240 <span class="keywordflow">break</span>;
<a name="l00241"></a>00241 }
<a name="l00242"></a>00242 <span class="keywordflow">case</span> 16: {
<a name="l00243"></a>00243 std::vector<gray16_pixel_t> row(width);
<a name="l00244"></a>00244 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) {
<a name="l00245"></a>00245 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
<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));
<a name="l00247"></a>00247 }
<a name="l00248"></a>00248 <span class="keywordflow">break</span>;
<a name="l00249"></a>00249 }
<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>);
<a name="l00251"></a>00251 }
<a name="l00252"></a>00252 <span class="keywordflow">break</span>;
<a name="l00253"></a>00253 <span class="keywordflow">case</span> PNG_COLOR_TYPE_RGB:
<a name="l00254"></a>00254 <span class="keywordflow">switch</span> (bit_depth) {
<a name="l00255"></a>00255 <span class="keywordflow">case</span> 8: {
<a name="l00256"></a>00256 std::vector<rgb8_pixel_t> row(width);
<a name="l00257"></a>00257 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) {
<a name="l00258"></a>00258 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
<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));
<a name="l00260"></a>00260 }
<a name="l00261"></a>00261 <span class="keywordflow">break</span>;
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263 <span class="keywordflow">case</span> 16: {
<a name="l00264"></a>00264 std::vector<rgb16_pixel_t> row(width);
<a name="l00265"></a>00265 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) {
<a name="l00266"></a>00266 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
<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));
<a name="l00268"></a>00268 }
<a name="l00269"></a>00269 <span class="keywordflow">break</span>;
<a name="l00270"></a>00270 }
<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>);
<a name="l00272"></a>00272 }
<a name="l00273"></a>00273 <span class="keywordflow">break</span>;
<a name="l00274"></a>00274 <span class="keywordflow">case</span> PNG_COLOR_TYPE_RGBA:
<a name="l00275"></a>00275 <span class="keywordflow">switch</span> (bit_depth) {
<a name="l00276"></a>00276 <span class="keywordflow">case</span> 8: {
<a name="l00277"></a>00277 std::vector<rgba8_pixel_t> row(width);
<a name="l00278"></a>00278 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) {
<a name="l00279"></a>00279 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
<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));
<a name="l00281"></a>00281 }
<a name="l00282"></a>00282 <span class="keywordflow">break</span>;
<a name="l00283"></a>00283 }
<a name="l00284"></a>00284 <span class="keywordflow">case</span> 16: {
<a name="l00285"></a>00285 std::vector<rgba16_pixel_t> row(width);
<a name="l00286"></a>00286 <span class="keywordflow">for</span>(png_uint_32 y=0;y<height;++y) {
<a name="l00287"></a>00287 png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
<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));
<a name="l00289"></a>00289 }
<a name="l00290"></a>00290 <span class="keywordflow">break</span>;
<a name="l00291"></a>00291 }
<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>);
<a name="l00293"></a>00293 }
<a name="l00294"></a>00294 <span class="keywordflow">break</span>;
<a name="l00295"></a>00295 <span class="keywordflow">default</span>: io_error(<span class="stringliteral">"png_reader_color_convert::apply(): unknown color type"</span>);
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297 png_read_end(_png_ptr,NULL);
<a name="l00298"></a>00298 }
<a name="l00299"></a>00299 <span class="keyword">template</span> <<span class="keyword">typename</span> Image>
<a name="l00300"></a>00300 <span class="keywordtype">void</span> read_image(Image& im) {
<a name="l00301"></a>00301 im.recreate(get_dimensions());
<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));
<a name="l00303"></a>00303 }
<a name="l00304"></a>00304 };
<a name="l00305"></a>00305
<a name="l00306"></a>00306
<a name="l00307"></a>00307 <span class="keyword">class </span>png_writer : <span class="keyword">public</span> file_mgr {
<a name="l00308"></a>00308 <span class="keyword">protected</span>:
<a name="l00309"></a>00309 png_structp _png_ptr;
<a name="l00310"></a>00310 png_infop _info_ptr;
<a name="l00311"></a>00311
<a name="l00312"></a>00312 <span class="keywordtype">void</span> init() {
<a name="l00313"></a>00313 _png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
<a name="l00314"></a>00314 io_error_if(!_png_ptr,<span class="stringliteral">"png_write_initialize: fail to call png_create_write_struct()"</span>);
<a name="l00315"></a>00315 _info_ptr = png_create_info_struct(_png_ptr);
<a name="l00316"></a>00316 <span class="keywordflow">if</span> (!_info_ptr) {
<a name="l00317"></a>00317 png_destroy_write_struct(&_png_ptr,png_infopp_NULL);
<a name="l00318"></a>00318 io_error(<span class="stringliteral">"png_write_initialize: fail to call png_create_info_struct()"</span>);
<a name="l00319"></a>00319 }
<a name="l00320"></a>00320 <span class="keywordflow">if</span> (setjmp(png_jmpbuf(_png_ptr))) {
<a name="l00321"></a>00321 png_destroy_write_struct(&_png_ptr, &_info_ptr);
<a name="l00322"></a>00322 io_error(<span class="stringliteral">"png_write_initialize: fail to call setjmp(png_jmpbuf())"</span>);
<a name="l00323"></a>00323 }
<a name="l00324"></a>00324 png_init_io(_png_ptr,<span class="keyword">get</span>());
<a name="l00325"></a>00325 }
<a name="l00326"></a>00326 <span class="keyword">public</span>:
<a name="l00327"></a>00327 png_writer(FILE* file ) : file_mgr(file) { init(); }
<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(); }
<a name="l00329"></a>00329
<a name="l00330"></a>00330 ~png_writer() {
<a name="l00331"></a>00331 png_destroy_write_struct(&_png_ptr,&_info_ptr);
<a name="l00332"></a>00332 }
<a name="l00333"></a>00333 <span class="keyword">template</span> <<span class="keyword">typename</span> View>
<a name="l00334"></a>00334 <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View& view) {
<a name="l00335"></a>00335 png_set_IHDR(_png_ptr, _info_ptr, view.width(), view.height(),
<a name="l00336"></a>00336 png_write_support_private<typename channel_type<View>::type,
<a name="l00337"></a>00337 <span class="keyword">typename</span> color_space_type<View>::type>::bit_depth,
<a name="l00338"></a>00338 png_write_support_private<typename channel_type<View>::type,
<a name="l00339"></a>00339 <span class="keyword">typename</span> color_space_type<View>::type>::color_type,
<a name="l00340"></a>00340 PNG_INTERLACE_NONE,
<a name="l00341"></a>00341 PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
<a name="l00342"></a>00342 png_write_info(_png_ptr,_info_ptr);
<a name="l00343"></a>00343 <span class="keywordflow">if</span> (little_endian() &&
<a name="l00344"></a>00344 png_write_support_private<<span class="keyword">typename</span> channel_type<View>::type,
<a name="l00345"></a>00345 <span class="keyword">typename</span> color_space_type<View>::type>::bit_depth>8)
<a name="l00346"></a>00346 png_set_swap(_png_ptr);
<a name="l00347"></a>00347 std::vector<pixel<typename channel_type<View>::type,
<a name="l00348"></a>00348 layout<typename color_space_type<View>::type> > > row(view.width());
<a name="l00349"></a>00349 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> y=0;y<view.height();++y) {
<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());
<a name="l00351"></a>00351 png_write_row(_png_ptr,(png_bytep)&row.front());
<a name="l00352"></a>00352 }
<a name="l00353"></a>00353 png_write_end(_png_ptr,_info_ptr);
<a name="l00354"></a>00354 }
<a name="l00355"></a>00355 };
<a name="l00356"></a>00356
<a name="l00357"></a>00357 } <span class="comment">// namespace detail</span>
<a name="l00358"></a>00358 } } <span class="comment">// namespace boost::gil</span>
<a name="l00359"></a>00359
<a name="l00360"></a>00360 <span class="preprocessor">#endif</span>
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