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  41 <h1>png_dynamic_io.hpp</h1><a href="g_i_l_0251.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
  42 <a name="l00002"></a>00002 <span class="comment">    Copyright 2005-2007 Adobe Systems Incorporated</span>
  43 <a name="l00003"></a>00003 <span class="comment">   </span>
  44 <a name="l00004"></a>00004 <span class="comment">    Use, modification and distribution are subject to the Boost Software License,</span>
  45 <a name="l00005"></a>00005 <span class="comment">    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
  46 <a name="l00006"></a>00006 <span class="comment">    http://www.boost.org/LICENSE_1_0.txt).</span>
  47 <a name="l00007"></a>00007 <span class="comment"></span>
  48 <a name="l00008"></a>00008 <span class="comment">    See http://opensource.adobe.com/gil for most recent version including documentation.</span>
  49 <a name="l00009"></a>00009 <span class="comment">*/</span>
  50 <a name="l00010"></a>00010
  51 <a name="l00011"></a>00011 <span class="comment">/*************************************************************************************************/</span>
  52 <a name="l00012"></a>00012
  53 <a name="l00013"></a>00013 <span class="preprocessor">#ifndef GIL_PNG_DYNAMIC_IO_H</span>
  54 <a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define GIL_PNG_DYNAMIC_IO_H</span>
  55 <a name="l00015"></a>00015 <span class="preprocessor"></span>
  56 <a name="l00023"></a>00023 <span class="comment">//</span>
  57 <a name="l00024"></a>00024 <span class="comment">// We are currently providing the following functions:</span>
  58 <a name="l00025"></a>00025 <span class="comment">// template &lt;typename Images&gt; void png_read_image(const char*,any_image&lt;Images&gt;&amp;)</span>
  59 <a name="l00026"></a>00026 <span class="comment">// template &lt;typename Images&gt; void png_read_image(FILE*,any_image&lt;Images&gt;&amp;,std::size_t)</span>
  60 <a name="l00027"></a>00027 <span class="comment">// template &lt;typename Views&gt; void png_write_view(const char*,const any_image_view&lt;View&gt;&amp;)</span>
  61 <a name="l00028"></a>00028 <span class="comment">// template &lt;typename Views&gt; void png_write_view(FILE*,const any_image_view&lt;View&gt;&amp;)</span>
  62 <a name="l00029"></a>00029
  63 <a name="l00030"></a>00030
  64 <a name="l00031"></a>00031 <span class="preprocessor">#include &lt;string&gt;</span>
  65 <a name="l00032"></a>00032 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
  66 <a name="l00033"></a>00033 <span class="preprocessor">#include &lt;boost/mpl/bool.hpp&gt;</span>
  67 <a name="l00034"></a>00034 <span class="preprocessor">#include &lt;boost/shared_ptr.hpp&gt;</span>
  68 <a name="l00035"></a>00035 <span class="preprocessor">#include "../dynamic_image/dynamic_image_all.hpp"</span>
  69 <a name="l00036"></a>00036 <span class="preprocessor">#include "<a class="code" href="io__error_8hpp.html" title="Handle input-output errors.">io_error.hpp</a>"</span>
  70 <a name="l00037"></a>00037 <span class="preprocessor">#include "<a class="code" href="png__io_8hpp.html" title="Support for reading and writing PNG files Requires libpng and zlib!">png_io.hpp</a>"</span>
  71 <a name="l00038"></a>00038 <span class="preprocessor">#include "<a class="code" href="g_i_l_0254.html" title="Internal support for reading and writing PNG files.">png_io_private.hpp</a>"</span>
  72 <a name="l00039"></a>00039 <span class="preprocessor">#include "<a class="code" href="g_i_l_0085.html" title="Generic io functions for dealing with dynamic images.">dynamic_io.hpp</a>"</span>
  73 <a name="l00040"></a>00040
  74 <a name="l00041"></a>00041 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
  75 <a name="l00042"></a>00042
  76 <a name="l00043"></a>00043 <span class="keyword">namespace </span>detail {
  77 <a name="l00044"></a>00044
  78 <a name="l00045"></a>00045 <span class="keyword">struct </span>png_write_is_supported {
  79 <a name="l00046"></a>00046     <span class="keyword">template</span>&lt;<span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>apply
  80 <a name="l00047"></a>00047         : <span class="keyword">public</span> mpl::bool_&lt;png_write_support&lt;View&gt;::is_supported&gt; {};
  81 <a name="l00048"></a>00048 };
  82 <a name="l00049"></a>00049
  83 <a name="l00050"></a>00050 <span class="keyword">class </span>png_writer_dynamic : <span class="keyword">public</span> png_writer {
  84 <a name="l00051"></a>00051 <span class="keyword">public</span>:
  85 <a name="l00052"></a>00052     png_writer_dynamic(FILE* file          ) : png_writer(file)    {}
  86 <a name="l00053"></a>00053     png_writer_dynamic(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename) : png_writer(filename){}
  87 <a name="l00054"></a>00054
  88 <a name="l00055"></a>00055     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Views&gt;
  89 <a name="l00056"></a>00056     <span class="keywordtype">void</span> write_view(<span class="keyword">const</span> any_image_view&lt;Views&gt;&amp; runtime_view) {
  90 <a name="l00057"></a>00057         dynamic_io_fnobj&lt;png_write_is_supported, png_writer&gt; op(<span class="keyword">this</span>);
  91 <a name="l00058"></a>00058         <a class="code" href="group___variant.html#g3dc0a90911c08815be11e1e49ec06037" title="Invokes a generic constant operation (represented as a binary function object) on...">apply_operation</a>(runtime_view,op);
  92 <a name="l00059"></a>00059     }
  93 <a name="l00060"></a>00060 };
  94 <a name="l00061"></a>00061
  95 <a name="l00062"></a>00062 <span class="keyword">class </span>png_type_format_checker {
  96 <a name="l00063"></a>00063     <span class="keywordtype">int</span> _bit_depth;
  97 <a name="l00064"></a>00064     <span class="keywordtype">int</span> _color_type;
  98 <a name="l00065"></a>00065 <span class="keyword">public</span>:
  99 <a name="l00066"></a>00066     png_type_format_checker(<span class="keywordtype">int</span> bit_depth_in,<span class="keywordtype">int</span> color_type_in) :
 100 <a name="l00067"></a>00067         _bit_depth(bit_depth_in),_color_type(color_type_in) {}
 101 <a name="l00068"></a>00068     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Image&gt;
 102 <a name="l00069"></a>00069     <span class="keywordtype">bool</span> apply() {
 103 <a name="l00070"></a>00070         <span class="keywordflow">return</span> png_read_support&lt;typename Image::view_t&gt;::bit_depth==_bit_depth &amp;&amp;
 104 <a name="l00071"></a>00071             png_read_support&lt;typename Image::view_t&gt;::color_type==_color_type;
 105 <a name="l00072"></a>00072     }
 106 <a name="l00073"></a>00073 };
 107 <a name="l00074"></a>00074
 108 <a name="l00075"></a>00075 <span class="keyword">struct </span>png_read_is_supported {
 109 <a name="l00076"></a>00076     <span class="keyword">template</span>&lt;<span class="keyword">typename</span> View&gt; <span class="keyword">struct </span>apply
 110 <a name="l00077"></a>00077         : <span class="keyword">public</span> mpl::bool_&lt;png_read_support&lt;View&gt;::is_supported&gt; {};
 111 <a name="l00078"></a>00078 };
 112 <a name="l00079"></a>00079
 113 <a name="l00080"></a>00080 <span class="keyword">class </span>png_reader_dynamic : <span class="keyword">public</span> png_reader {
 114 <a name="l00081"></a>00081 <span class="keyword">public</span>:
 115 <a name="l00082"></a>00082     png_reader_dynamic(FILE* file)           : png_reader(file)    {}
 116 <a name="l00083"></a>00083     png_reader_dynamic(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename) : png_reader(filename){}
 117 <a name="l00084"></a>00084
 118 <a name="l00085"></a>00085     <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Images&gt;
 119 <a name="l00086"></a>00086     <span class="keywordtype">void</span> read_image(any_image&lt;Images&gt;&amp; im) {
 120 <a name="l00087"></a>00087         png_uint_32 width, height;
 121 <a name="l00088"></a>00088         <span class="keywordtype">int</span> bit_depth, color_type, interlace_type;
 122 <a name="l00089"></a>00089         png_get_IHDR(_png_ptr, _info_ptr,
 123 <a name="l00090"></a>00090                      &amp;width, &amp;height,&amp;bit_depth,&amp;color_type,&amp;interlace_type,
 124 <a name="l00091"></a>00091                      int_p_NULL, int_p_NULL);
 125 <a name="l00092"></a>00092         <span class="keywordflow">if</span> (!construct_matched(im,png_type_format_checker(bit_depth,color_type))) {
 126 <a name="l00093"></a>00093             io_error(<span class="stringliteral">"png_reader_dynamic::read_image(): no matching image type between those of the given any_image and that of the file"</span>);
 127 <a name="l00094"></a>00094         } <span class="keywordflow">else</span> {
 128 <a name="l00095"></a>00095             im.recreate(width,height);
 129 <a name="l00096"></a>00096             dynamic_io_fnobj&lt;png_read_is_supported, png_reader&gt; op(<span class="keyword">this</span>);
 130 <a name="l00097"></a>00097             <a class="code" href="group___variant.html#g3dc0a90911c08815be11e1e49ec06037" title="Invokes a generic constant operation (represented as a binary function object) on...">apply_operation</a>(<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),op);
 131 <a name="l00098"></a>00098         }
 132 <a name="l00099"></a>00099     }
 133 <a name="l00100"></a>00100 };
 134 <a name="l00101"></a>00101
 135 <a name="l00102"></a>00102 } <span class="comment">// namespace detail </span>
 136 <a name="l00103"></a>00103
 137 <a name="l00109"></a>00109 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Images&gt;
 138 <a name="l00110"></a><a class="code" href="g_i_l_0174.html#gaa5dd1e1d7d5c9ba497d2d52ccfd6523">00110</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="g_i_l_0174.html#ge9a35f15e2544de801e23b3c481612a9" title="Allocates a new image whose dimensions are determined by the given png image file...">png_read_image</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename,<a class="code" href="g_i_l_0018.html" title="Represents a run-time specified image. Note it does NOT model ImageConcept.">any_image&lt;Images&gt;</a>&amp; im) {
 139 <a name="l00111"></a>00111     detail::png_reader_dynamic m(filename);
 140 <a name="l00112"></a>00112     m.read_image(im);
 141 <a name="l00113"></a>00113 }
 142 <a name="l00114"></a>00114
 143 <a name="l00117"></a>00117 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Images&gt;
 144 <a name="l00118"></a><a class="code" href="g_i_l_0174.html#g920e9b7f4c8b491695ab64968a386de0">00118</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="g_i_l_0174.html#ge9a35f15e2544de801e23b3c481612a9" title="Allocates a new image whose dimensions are determined by the given png image file...">png_read_image</a>(<span class="keyword">const</span> std::string&amp; filename,<a class="code" href="g_i_l_0018.html" title="Represents a run-time specified image. Note it does NOT model ImageConcept.">any_image&lt;Images&gt;</a>&amp; im) {
 145 <a name="l00119"></a>00119     <a class="code" href="g_i_l_0174.html#ge9a35f15e2544de801e23b3c481612a9" title="Allocates a new image whose dimensions are determined by the given png image file...">png_read_image</a>(filename.c_str(),im);
 146 <a name="l00120"></a>00120 }
 147 <a name="l00121"></a>00121
 148 <a name="l00126"></a>00126 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Views&gt;
 149 <a name="l00127"></a><a class="code" href="g_i_l_0174.html#gaf208f891f567a13e2dc82f9b06d7858">00127</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="g_i_l_0174.html#gb8c6c4c3b78627324ac5983e348008de" title="Saves the view to a png file specified by the given png image file name.">png_write_view</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename,<span class="keyword">const</span> <a class="code" href="g_i_l_0020.html" title="Represents a run-time specified image view. Models HasDynamicXStepTypeConcept, HasDynamicYStepTypeCo...">any_image_view&lt;Views&gt;</a>&amp; runtime_view) {
 150 <a name="l00128"></a>00128     detail::png_writer_dynamic m(filename);
 151 <a name="l00129"></a>00129     m.write_view(runtime_view);
 152 <a name="l00130"></a>00130 }
 153 <a name="l00131"></a>00131
 154 <a name="l00134"></a>00134 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Views&gt;
 155 <a name="l00135"></a><a class="code" href="g_i_l_0174.html#gd2dd9992f27f2176f88b934bc8d408f5">00135</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="g_i_l_0174.html#gb8c6c4c3b78627324ac5983e348008de" title="Saves the view to a png file specified by the given png image file name.">png_write_view</a>(<span class="keyword">const</span> std::string&amp; filename,<span class="keyword">const</span> <a class="code" href="g_i_l_0020.html" title="Represents a run-time specified image view. Models HasDynamicXStepTypeConcept, HasDynamicYStepTypeCo...">any_image_view&lt;Views&gt;</a>&amp; runtime_view) {
 156 <a name="l00136"></a>00136     <a class="code" href="g_i_l_0174.html#gb8c6c4c3b78627324ac5983e348008de" title="Saves the view to a png file specified by the given png image file name.">png_write_view</a>(filename.c_str(),runtime_view);
 157 <a name="l00137"></a>00137 }
 158 <a name="l00138"></a>00138
 159 <a name="l00139"></a>00139 } }  <span class="comment">// namespace boost::gil</span>
 160 <a name="l00140"></a>00140
 161 <a name="l00141"></a>00141 <span class="preprocessor">#endif</span>
 162 </pre></div></div>
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 165 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
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