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<h1>/home/paul/dev/cegui/release_tmp/release_tmp/src/loaders/SILLYPNGImageLoader.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/***********************************************************************</span>
<a name="l00002"></a>00002 <span class="comment"> filename: SILLYPNGImageLoader.cpp</span>
<a name="l00003"></a>00003 <span class="comment"> created: 11 Jun 2006</span>
<a name="l00004"></a>00004 <span class="comment"> author: Olivier Delannoy </span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment"> purpose: Definition of the PNGImageLoader methods </span>
<a name="l00007"></a>00007 <span class="comment">*************************************************************************/</span>
<a name="l00008"></a>00008 <span class="comment">/***************************************************************************</span>
<a name="l00009"></a>00009 <span class="comment"> * Copyright (C) 2004 - 2006 Paul D Turner & The CEGUI Development Team</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining</span>
<a name="l00012"></a>00012 <span class="comment"> * a copy of this software and associated documentation files (the</span>
<a name="l00013"></a>00013 <span class="comment"> * "Software"), to deal in the Software without restriction, including</span>
<a name="l00014"></a>00014 <span class="comment"> * without limitation the rights to use, copy, modify, merge, publish,</span>
<a name="l00015"></a>00015 <span class="comment"> * distribute, sublicense, and/or sell copies of the Software, and to</span>
<a name="l00016"></a>00016 <span class="comment"> * permit persons to whom the Software is furnished to do so, subject to</span>
<a name="l00017"></a>00017 <span class="comment"> * the following conditions:</span>
<a name="l00018"></a>00018 <span class="comment"> *</span>
<a name="l00019"></a>00019 <span class="comment"> * The above copyright notice and this permission notice shall be</span>
<a name="l00020"></a>00020 <span class="comment"> * included in all copies or substantial portions of the Software.</span>
<a name="l00021"></a>00021 <span class="comment"> *</span>
<a name="l00022"></a>00022 <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,</span>
<a name="l00023"></a>00023 <span class="comment"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
<a name="l00024"></a>00024 <span class="comment"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.</span>
<a name="l00025"></a>00025 <span class="comment"> * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR</span>
<a name="l00026"></a>00026 <span class="comment"> * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,</span>
<a name="l00027"></a>00027 <span class="comment"> * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR</span>
<a name="l00028"></a>00028 <span class="comment"> * OTHER DEALINGS IN THE SOFTWARE.</span>
<a name="l00029"></a>00029 <span class="comment"> ***************************************************************************/</span>
<a name="l00030"></a>00030 <span class="preprocessor">#ifdef HAVE_CONFIG_H</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#include <config.h></span>
<a name="l00032"></a>00032 <span class="preprocessor">#endif</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span>
<a name="l00034"></a>00034 <span class="preprocessor">#include "loaders/SILLYPNGImageLoader.h"</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="preprocessor">#ifndef SILLY_OPT_INLINE</span>
<a name="l00037"></a>00037 <span class="preprocessor"></span><span class="preprocessor">#define inline </span>
<a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor">#include "loaders/SILLYPNGImageLoader.icpp"</span>
<a name="l00039"></a>00039 <span class="preprocessor">#undef inline</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00041"></a>00041 <span class="preprocessor"></span>
<a name="l00042"></a>00042 <span class="preprocessor">#include "loaders/SILLYPNGImageContext.h"</span>
<a name="l00043"></a>00043 <span class="preprocessor">#include <png.h></span>
<a name="l00044"></a>00044 <span class="comment">// Start section of namespace SILLY</span>
<a name="l00045"></a>00045 <span class="keyword">namespace </span>SILLY
<a name="l00046"></a>00046 {
<a name="l00047"></a><a class="code" href="a00168.html#6790832f40fc79ee7de1dbc788705834">00047</a> <span class="keywordtype">void</span> <a class="code" href="a00168.html#6790832f40fc79ee7de1dbc788705834">PNG_read_function</a>(png_structp png_ptr, png_bytep data, png_size_t length)
<a name="l00048"></a>00048 {
<a name="l00049"></a>00049 <a class="code" href="a00122.html">PNGImageContext</a>* png = reinterpret_cast<PNGImageContext*>(png_get_io_ptr(png_ptr));
<a name="l00050"></a>00050 <span class="keywordtype">int</span> readed = png-><a class="code" href="a00122.html#f0250cadc8e2bb1ced78237e5d08b335">read</a>(data, length);
<a name="l00051"></a>00051 <span class="keywordflow">if</span> (readed != (<span class="keywordtype">int</span>)length)
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 png_error(png_ptr, <span class="stringliteral">"PNG_read_function error"</span>);
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056
<a name="l00057"></a><a class="code" href="a00168.html#674de2149edd77d0a2ec7c3ecad7c6cc">00057</a> <span class="keywordtype">void</span> <a class="code" href="a00168.html#674de2149edd77d0a2ec7c3ecad7c6cc">PNG_warning_function</a>(png_structp png_ptr,
<a name="l00058"></a>00058 png_const_charp error)
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060 <span class="comment">// printf("PNG Warning: %s\n", error);</span>
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062
<a name="l00063"></a><a class="code" href="a00168.html#e69c398af01c700c055204cd037016a3">00063</a> <span class="keywordtype">void</span> <a class="code" href="a00168.html#e69c398af01c700c055204cd037016a3">PNG_error_function</a>(png_structp png_ptr,
<a name="l00064"></a>00064 png_const_charp error)
<a name="l00065"></a>00065 {
<a name="l00066"></a>00066 <span class="comment">// printf("PNG Error: %s\n", error);</span>
<a name="l00067"></a>00067 <span class="comment">// copied from libpng's pngerror.cpp</span>
<a name="l00068"></a>00068 jmp_buf buf;
<a name="l00069"></a>00069 memcpy(buf, png_ptr->jmpbuf, <span class="keyword">sizeof</span>(jmp_buf));
<a name="l00070"></a>00070 longjmp(buf, 1);
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072
<a name="l00073"></a>00073
<a name="l00074"></a><a class="code" href="a00123.html#c0168121ae72ab968bf3ac497fc76951">00074</a> <a class="code" href="a00123.html#c0168121ae72ab968bf3ac497fc76951">PNGImageLoader::PNGImageLoader</a>()
<a name="l00075"></a>00075 : <a class="code" href="a00117.html">ImageLoader</a>(<span class="stringliteral">"PNG Image Loader based on libpng"</span>)
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077 }
<a name="l00078"></a><a class="code" href="a00123.html#9968fdc5f7536636d8ed02e4e8924861">00078</a> <a class="code" href="a00123.html#9968fdc5f7536636d8ed02e4e8924861">PNGImageLoader::~PNGImageLoader</a>()
<a name="l00079"></a>00079 {
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081
<a name="l00082"></a>00082
<a name="l00083"></a><a class="code" href="a00123.html#4f11ee7a4608e00c76388a3f13a718a1">00083</a> <a class="code" href="a00116.html">ImageContext</a>* <a class="code" href="a00123.html#4f11ee7a4608e00c76388a3f13a718a1">PNGImageLoader::loadHeader</a>(<a class="code" href="a00168.html#2f8e63a7cc51f96526c3e81712b64890">PixelFormat</a>& formatSource, <a class="code" href="a00113.html">DataSource</a>* data)
<a name="l00084"></a>00084 {
<a name="l00085"></a>00085 <a class="code" href="a00122.html">PNGImageContext</a>* png = <span class="keyword">new</span> <a class="code" href="a00122.html">PNGImageContext</a>(data);
<a name="l00086"></a>00086 <span class="keywordflow">if</span> (!png)
<a name="l00087"></a>00087 {
<a name="l00088"></a>00088 <span class="keywordflow">return</span> 0;
<a name="l00089"></a>00089
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 <span class="comment">// Prepare png loading </span>
<a name="l00092"></a>00092 png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a> = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
<a name="l00093"></a>00093 <span class="keywordflow">if</span> (png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a> == 0)
<a name="l00094"></a>00094 {
<a name="l00095"></a>00095 <span class="keyword">delete</span> png;
<a name="l00096"></a>00096 <span class="keywordflow">return</span> 0;
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098 png-><a class="code" href="a00122.html#7d6c1612c8c12c553d205bfed58ce3b9">d_info_ptr</a> = png_create_info_struct(png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a>);
<a name="l00099"></a>00099 <span class="keywordflow">if</span> (png-><a class="code" href="a00122.html#7d6c1612c8c12c553d205bfed58ce3b9">d_info_ptr</a> == 0)
<a name="l00100"></a>00100 {
<a name="l00101"></a>00101 <span class="keyword">delete</span> png;
<a name="l00102"></a>00102 <span class="keywordflow">return</span> 0;
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104 <span class="keywordflow">if</span> (setjmp(png_jmpbuf(png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a>)))
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106 <span class="keyword">delete</span> png;
<a name="l00107"></a>00107 <span class="keywordflow">return</span> 0;
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109 png_set_error_fn(png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a>, 0, <a class="code" href="a00168.html#e69c398af01c700c055204cd037016a3">PNG_error_function</a>, <a class="code" href="a00168.html#674de2149edd77d0a2ec7c3ecad7c6cc">PNG_warning_function</a>);
<a name="l00110"></a>00110 png_set_read_fn(png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a>, png, <a class="code" href="a00168.html#6790832f40fc79ee7de1dbc788705834">PNG_read_function</a>);
<a name="l00111"></a>00111 <span class="comment">//png_set_sig_bytes(png->d_png_ptr, 8);</span>
<a name="l00112"></a>00112
<a name="l00113"></a>00113
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="comment">// Read header Check whether PNG can depaletize transparently or not</span>
<a name="l00116"></a>00116 <span class="keywordtype">int</span> png_transform = PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_EXPAND;
<a name="l00117"></a>00117 <span class="comment">//printf("Start reading png\n");</span>
<a name="l00118"></a>00118 png_read_png(png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a>, png-><a class="code" href="a00122.html#7d6c1612c8c12c553d205bfed58ce3b9">d_info_ptr</a>, png_transform, 0);
<a name="l00119"></a>00119 png-><a class="code" href="a00122.html#1933030eb30a6d5c198a768d8e4fef86">setImageSize</a>();
<a name="l00120"></a>00120 png-><a class="code" href="a00122.html#4e3d6d3899b9074d11bf0c57f58d2dd3">d_bit_depth</a> = png_get_bit_depth(png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a>, png-><a class="code" href="a00122.html#7d6c1612c8c12c553d205bfed58ce3b9">d_info_ptr</a>);
<a name="l00121"></a>00121 png-><a class="code" href="a00122.html#a84333bb8cc36af37a7c95c4b0691f4c">d_num_channels</a> = png_get_channels(png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a>, png-><a class="code" href="a00122.html#7d6c1612c8c12c553d205bfed58ce3b9">d_info_ptr</a>);
<a name="l00122"></a>00122 <span class="comment">//printf("PNG Info: width: %d height: %d bpp: %d channels: %d\n", png->getWidth(), png->getHeight(), png->d_bit_depth, png->d_num_channels);</span>
<a name="l00123"></a>00123 <span class="keywordflow">if</span> (png-><a class="code" href="a00122.html#4e3d6d3899b9074d11bf0c57f58d2dd3">d_bit_depth</a> == 8)
<a name="l00124"></a>00124 {
<a name="l00125"></a>00125 <span class="keywordflow">if</span> (png-><a class="code" href="a00122.html#a84333bb8cc36af37a7c95c4b0691f4c">d_num_channels</a> == 4)
<a name="l00126"></a>00126 {
<a name="l00127"></a>00127 formatSource = PF_RGBA;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (png-><a class="code" href="a00122.html#a84333bb8cc36af37a7c95c4b0691f4c">d_num_channels</a> == 3)
<a name="l00130"></a>00130 {
<a name="l00131"></a>00131 formatSource = PF_RGB;
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133 <span class="keywordflow">else</span>
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135 <span class="keyword">delete</span> png;
<a name="l00136"></a>00136 <span class="keywordflow">return</span> 0;
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 <span class="comment">// Paletized or grayscale not yet handled </span>
<a name="l00140"></a>00140 <span class="keywordflow">else</span>
<a name="l00141"></a>00141 {
<a name="l00142"></a>00142 <span class="keyword">delete</span> png;
<a name="l00143"></a>00143 <span class="keywordflow">return</span> 0;
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 <span class="keywordflow">return</span> png;
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147
<a name="l00148"></a>00148
<a name="l00149"></a><a class="code" href="a00123.html#aaadc333060f75e71f11a89128d9a350">00149</a> <span class="keywordtype">bool</span> <a class="code" href="a00123.html#aaadc333060f75e71f11a89128d9a350">PNGImageLoader::loadImageData</a>(<a class="code" href="a00168.html#591746ccd8c678870692cbf1cb302d6a">PixelOrigin</a> origin,
<a name="l00150"></a>00150 <a class="code" href="a00113.html">DataSource</a>* data,
<a name="l00151"></a>00151 <a class="code" href="a00116.html">ImageContext</a>* context)
<a name="l00152"></a>00152 {
<a name="l00153"></a>00153 <a class="code" href="a00122.html">PNGImageContext</a>* png = static_cast<PNGImageContext*>(context);
<a name="l00154"></a>00154 <a class="code" href="a00168.html#ea185528b70b44efcecbc49855184018">byte</a> red;
<a name="l00155"></a>00155 <a class="code" href="a00168.html#ea185528b70b44efcecbc49855184018">byte</a> green;
<a name="l00156"></a>00156 <a class="code" href="a00168.html#ea185528b70b44efcecbc49855184018">byte</a> blue;
<a name="l00157"></a>00157 <a class="code" href="a00168.html#ea185528b70b44efcecbc49855184018">byte</a> alpha;
<a name="l00158"></a>00158 size_t width = png-><a class="code" href="a00116.html#a631da5da7b11ecc0723a48501ae91c6">getWidth</a>();
<a name="l00159"></a>00159 size_t height = png-><a class="code" href="a00116.html#eb0ccdda69dac79dcc96f1ebe4159973">getHeight</a>();
<a name="l00160"></a>00160 png_bytepp row_pointers = png_get_rows(png-><a class="code" href="a00122.html#238ed61fc91b69ce34cdeef88d4aab80">d_png_ptr</a>, png-><a class="code" href="a00122.html#7d6c1612c8c12c553d205bfed58ce3b9">d_info_ptr</a>);
<a name="l00161"></a>00161 <span class="keywordflow">if</span> (png-><a class="code" href="a00122.html#4e3d6d3899b9074d11bf0c57f58d2dd3">d_bit_depth</a> == 8)
<a name="l00162"></a>00162 {
<a name="l00163"></a>00163 <span class="comment">// Read RGBA </span>
<a name="l00164"></a>00164 <span class="keywordflow">if</span> (png-><a class="code" href="a00122.html#a84333bb8cc36af37a7c95c4b0691f4c">d_num_channels</a> == 4)
<a name="l00165"></a>00165 {
<a name="l00166"></a>00166 <span class="keywordflow">for</span> (size_t j = 0 ; j < height ; ++j)
<a name="l00167"></a>00167 {
<a name="l00168"></a>00168 <span class="keywordflow">for</span>(size_t i = 0 ; i < width ; ++i)
<a name="l00169"></a>00169 {
<a name="l00170"></a>00170 size_t pixel_offset = 4 * i;
<a name="l00171"></a>00171 red = *(row_pointers[j] + pixel_offset);
<a name="l00172"></a>00172 green = *(row_pointers[j] + pixel_offset + 1);
<a name="l00173"></a>00173 blue = *(row_pointers[j] + pixel_offset + 2);
<a name="l00174"></a>00174 alpha = *(row_pointers[j] + pixel_offset + 3);
<a name="l00175"></a>00175 png-><a class="code" href="a00116.html#acc0cfe8dfb001303b42ae29e07f74c1">setNextPixel</a>(red, green, blue, alpha);
<a name="l00176"></a>00176 }
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178 }
<a name="l00179"></a>00179 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (png-><a class="code" href="a00122.html#a84333bb8cc36af37a7c95c4b0691f4c">d_num_channels</a> == 3)
<a name="l00180"></a>00180 {
<a name="l00181"></a>00181 alpha = 0xff;
<a name="l00182"></a>00182 <span class="keywordflow">for</span> (size_t j = 0 ; j < height ; ++j)
<a name="l00183"></a>00183 {
<a name="l00184"></a>00184 <span class="keywordflow">for</span>(size_t i = 0 ; i < width ; ++i)
<a name="l00185"></a>00185 {
<a name="l00186"></a>00186 size_t pixel_offset = 3 * i;
<a name="l00187"></a>00187 red = *(row_pointers[j] + pixel_offset);
<a name="l00188"></a>00188 green = *(row_pointers[j] + pixel_offset + 1);
<a name="l00189"></a>00189 blue = *(row_pointers[j] + pixel_offset + 2);
<a name="l00190"></a>00190 png-><a class="code" href="a00116.html#acc0cfe8dfb001303b42ae29e07f74c1">setNextPixel</a>(red, green, blue, alpha);
<a name="l00191"></a>00191 }
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193
<a name="l00194"></a>00194 }
<a name="l00195"></a>00195 }
<a name="l00196"></a>00196 <span class="keywordflow">if</span> (origin == PO_BOTTOM_LEFT)
<a name="l00197"></a>00197 <span class="keywordflow">return</span> png-><a class="code" href="a00116.html#7563da222c2228f6af6a2b4fc00f85cb">flipVertically</a>();
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201
<a name="l00202"></a>00202 } <span class="comment">// End section of namespace SILLY </span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Nov 5 14:38:42 2006 for Simple Image Loading LibrarY by
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.7 </small></address>
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