<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <title>AlbumShaper: jpegTools.h File Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body> <!-- Generated by Doxygen 1.6.2 --> <div class="navigation" id="top"> <div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul> </div> <div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul> </div> </div> <div class="contents"> <h1>jpegTools.h File Reference</h1><div class="dynheader"> This graph shows which files directly or indirectly include this file:</div> <div class="dynsection"> </div> <p><a href="jpegTools_8h_source.html">Go to the source code of this file.</a></p> <table border="0" cellpadding="0" cellspacing="0"> <tr><td colspan="2"><h2>Functions</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="jpegTools_8h.html#a36feb9ccaed70cf0eb75ebdc6b21e42b">scaleJPEG</a> (QString fileIn, QImage &scaledImage, int targetWidth, int targetHeight)</td></tr> <tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="jpegTools_8h.html#afcce9106838e2c1f2ef66e18c8e4e160">transformJPEG</a> (QString fileIn, QString fileOut, <a class="el" href="imageTools_8h.html#ad6b8916a355278afb7cd35f14afc9288">TRANSFORM_CODE</a> transformation)</td></tr> </table> <hr/><h2>Function Documentation</h2> <a class="anchor" id="a36feb9ccaed70cf0eb75ebdc6b21e42b"></a><!-- doxytag: member="jpegTools.h::scaleJPEG" ref="a36feb9ccaed70cf0eb75ebdc6b21e42b" args="(QString fileIn, QImage &scaledImage, int targetWidth, int targetHeight)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">bool scaleJPEG </td> <td>(</td> <td class="paramtype">QString </td> <td class="paramname"> <em>fileIn</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">QImage & </td> <td class="paramname"> <em>scaledImage</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>targetWidth</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>targetHeight</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Definition at line <a class="el" href="jpegTools_8cpp_source.html#l00054">54</a> of file <a class="el" href="jpegTools_8cpp_source.html">jpegTools.cpp</a>.</p> <p>References <a class="el" href="jpegTools_8cpp_source.html#l00037">GVJPEGFatalError::handler()</a>, and <a class="el" href="jpegTools_8cpp_source.html#l00035">GVJPEGFatalError::mJmpBuffer</a>.</p> <p>Referenced by <a class="el" href="imageTools_8cpp_source.html#l00171">scaleImage()</a>.</p> <p><div class="fragment"><pre class="fragment"><a name="l00056"></a>00056 { <a name="l00057"></a>00057 <span class="comment">//get jpeg info</span> <a name="l00058"></a>00058 <span class="keyword">struct </span>jpeg_decompress_struct cinfo; <a name="l00059"></a>00059 <a name="l00060"></a>00060 <span class="comment">//open file</span> <a name="l00061"></a>00061 FILE* inputFile=fopen( fileIn.ascii(), <span class="stringliteral">"rb"</span> ); <a name="l00062"></a>00062 <span class="keywordflow">if</span>(!inputFile) <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00063"></a>00063 <a name="l00064"></a>00064 <span class="comment">//error checking on jpg file</span> <a name="l00065"></a>00065 <span class="keyword">struct </span><a class="code" href="structGVJPEGFatalError.html">GVJPEGFatalError</a> jerr; <a name="l00066"></a>00066 cinfo.err = jpeg_std_error(&jerr); <a name="l00067"></a>00067 cinfo.err->error_exit = <a class="code" href="structGVJPEGFatalError.html#ae8cb251ef57649ad96330aa1e934ea36">GVJPEGFatalError::handler</a>; <a name="l00068"></a>00068 <span class="keywordflow">if</span> (setjmp(jerr.mJmpBuffer)) <a name="l00069"></a>00069 { <a name="l00070"></a>00070 jpeg_destroy_decompress(&cinfo); <a name="l00071"></a>00071 fclose(inputFile); <a name="l00072"></a>00072 <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00073"></a>00073 } <a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="comment">//get jpeg resolution</span> <a name="l00076"></a>00076 jpeg_create_decompress(&cinfo); <a name="l00077"></a>00077 jpeg_stdio_src(&cinfo, inputFile); <a name="l00078"></a>00078 jpeg_read_header(&cinfo, TRUE); <a name="l00079"></a>00079 <a name="l00080"></a>00080 <span class="comment">//find optimal scale fraction (must be power of two)</span> <a name="l00081"></a>00081 <span class="keywordtype">int</span> origWidth = (int)cinfo.image_width; <a name="l00082"></a>00082 <span class="keywordtype">int</span> origHeight = (<span class="keywordtype">int</span>)cinfo.image_height; <a name="l00083"></a>00083 <span class="keywordtype">int</span> num = 1; <a name="l00084"></a>00084 <span class="keywordtype">int</span> denom = 1; <a name="l00085"></a>00085 <a name="l00086"></a>00086 <span class="comment">//if image is bigger than target, scale down by adjusting the denominator</span> <a name="l00087"></a>00087 <span class="keywordflow">if</span>( origWidth > targetWidth || origHeight > targetHeight ) <a name="l00088"></a>00088 { <a name="l00089"></a>00089 <span class="keywordflow">while</span>( denom < 8 && <a name="l00090"></a>00090 ( origWidth / (denom*2) >= targetWidth || origHeight / (denom*2) >= targetHeight ) <a name="l00091"></a>00091 ) <a name="l00092"></a>00092 { denom = denom*2; } <a name="l00093"></a>00093 } <a name="l00094"></a>00094 <a name="l00095"></a>00095 <span class="comment">//set scaling fraction</span> <a name="l00096"></a>00096 cinfo.scale_num=num; <a name="l00097"></a>00097 cinfo.scale_denom=denom; <a name="l00098"></a>00098 <a name="l00099"></a>00099 <span class="comment">//create intermediary image scaled by power of 2</span> <a name="l00100"></a>00100 jpeg_start_decompress(&cinfo); <a name="l00101"></a>00101 <a name="l00102"></a>00102 <span class="keywordflow">switch</span>(cinfo.output_components) <a name="l00103"></a>00103 { <a name="l00104"></a>00104 <span class="comment">//Black and White Image</span> <a name="l00105"></a>00105 <span class="keywordflow">case</span> 1: <a name="l00106"></a>00106 { <a name="l00107"></a>00107 scaledImage.create( cinfo.output_width, cinfo.output_height, 8, 256 ); <a name="l00108"></a>00108 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i<256; i++) <a name="l00109"></a>00109 { <a name="l00110"></a>00110 scaledImage.setColor(i, qRgb(i,i,i)); <a name="l00111"></a>00111 } <a name="l00112"></a>00112 } <a name="l00113"></a>00113 <span class="keywordflow">break</span>; <a name="l00114"></a>00114 <a name="l00115"></a>00115 <span class="comment">//24 or 32 bit color image</span> <a name="l00116"></a>00116 <span class="keywordflow">case</span> 3: <a name="l00117"></a>00117 <span class="keywordflow">case</span> 4: <a name="l00118"></a>00118 scaledImage.create( cinfo.output_width, cinfo.output_height, 32 ); <a name="l00119"></a>00119 <span class="keywordflow">break</span>; <a name="l00120"></a>00120 <a name="l00121"></a>00121 <span class="comment">//Unknown color depth</span> <a name="l00122"></a>00122 <span class="keywordflow">default</span>: <a name="l00123"></a>00123 jpeg_destroy_decompress(&cinfo); <a name="l00124"></a>00124 fclose(inputFile); <a name="l00125"></a>00125 <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00126"></a>00126 } <a name="l00127"></a>00127 <a name="l00128"></a>00128 <span class="comment">//fast scale image</span> <a name="l00129"></a>00129 uchar** lines = scaledImage.jumpTable(); <a name="l00130"></a>00130 <span class="keywordflow">while</span> (cinfo.output_scanline < cinfo.output_height) <a name="l00131"></a>00131 { <a name="l00132"></a>00132 jpeg_read_scanlines(&cinfo, lines + cinfo.output_scanline, cinfo.output_height); <a name="l00133"></a>00133 } <a name="l00134"></a>00134 jpeg_finish_decompress(&cinfo); <a name="l00135"></a>00135 <a name="l00136"></a>00136 <a name="l00137"></a>00137 <span class="comment">//expand 8 to 32bits per pixel since QImage wants 32</span> <a name="l00138"></a>00138 <span class="keywordflow">if</span> ( cinfo.output_components == 1 ) <a name="l00139"></a>00139 { <a name="l00140"></a>00140 scaledImage = scaledImage.convertDepth( 32, Qt::AutoColor ); <a name="l00141"></a>00141 } <a name="l00142"></a>00142 <a name="l00143"></a>00143 <span class="comment">//expand 24 to 32bits per pixel since QImage wants 32</span> <a name="l00144"></a>00144 <span class="keywordflow">if</span> ( cinfo.output_components == 3 ) <a name="l00145"></a>00145 { <a name="l00146"></a>00146 <span class="keywordflow">for</span> (uint j=0; j<cinfo.output_height; j++) <a name="l00147"></a>00147 { <a name="l00148"></a>00148 uchar *in = scaledImage.scanLine(j) + cinfo.output_width*3; <a name="l00149"></a>00149 QRgb *out = (QRgb*)( scaledImage.scanLine(j) ); <a name="l00150"></a>00150 <a name="l00151"></a>00151 <span class="keywordflow">for</span> (uint i=cinfo.output_width; i--; ) <a name="l00152"></a>00152 { <a name="l00153"></a>00153 in-=3; <a name="l00154"></a>00154 out[i] = qRgb(in[0], in[1], in[2]); <a name="l00155"></a>00155 } <a name="l00156"></a>00156 } <a name="l00157"></a>00157 } <a name="l00158"></a>00158 <a name="l00159"></a>00159 <span class="comment">//use slower smooth scale technique to scale to final size from intermediate image </span> <a name="l00160"></a>00160 <span class="keywordflow">if</span>( scaledImage.width() != targetWidth || scaledImage.height() != targetHeight ) <a name="l00161"></a>00161 { <a name="l00162"></a>00162 <span class="keywordtype">int</span> clampedTargetWidth = targetWidth; <a name="l00163"></a>00163 <span class="keywordtype">int</span> clampedTargetHeight = targetHeight; <a name="l00164"></a>00164 <span class="comment">//clamp scaling up to < 2x</span> <a name="l00165"></a>00165 <span class="keywordflow">if</span>(QMIN( ((<span class="keywordtype">float</span>)targetWidth)/origWidth, ((<span class="keywordtype">float</span>)targetHeight)/origHeight ) > 2) <a name="l00166"></a>00166 { <a name="l00167"></a>00167 clampedTargetWidth = 2*origWidth; <a name="l00168"></a>00168 clampedTargetHeight = 2*origHeight; <a name="l00169"></a>00169 } <a name="l00170"></a>00170 <a name="l00171"></a>00171 scaledImage = scaledImage.smoothScale(clampedTargetWidth, clampedTargetHeight, QImage::ScaleMin); <a name="l00172"></a>00172 } <a name="l00173"></a>00173 jpeg_destroy_decompress(&cinfo); <a name="l00174"></a>00174 fclose(inputFile); <a name="l00175"></a>00175 <span class="keywordflow">return</span> <span class="keyword">true</span>; <a name="l00176"></a>00176 } </pre></div></p> </div> </div> <a class="anchor" id="afcce9106838e2c1f2ef66e18c8e4e160"></a><!-- doxytag: member="jpegTools.h::transformJPEG" ref="afcce9106838e2c1f2ef66e18c8e4e160" args="(QString fileIn, QString fileOut, TRANSFORM_CODE transformation)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">bool transformJPEG </td> <td>(</td> <td class="paramtype">QString </td> <td class="paramname"> <em>fileIn</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">QString </td> <td class="paramname"> <em>fileOut</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="imageTools_8h.html#ad6b8916a355278afb7cd35f14afc9288">TRANSFORM_CODE</a> </td> <td class="paramname"> <em>transformation</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p><p>!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</p> <p>!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! </p> </p> <p>Definition at line <a class="el" href="jpegTools_8cpp_source.html#l00178">178</a> of file <a class="el" href="jpegTools_8cpp_source.html">jpegTools.cpp</a>.</p> <p>References <a class="el" href="imageTools_8h_source.html#l00028">FLIP_H</a>, <a class="el" href="imageTools_8h_source.html#l00029">FLIP_V</a>, <a class="el" href="jpegInternal_8h_source.html#l00069">jpeg_transform_info::force_grayscale</a>, <a class="el" href="jpegInternal_8h.html#a8b7f34edce3037c64a42d7de0af24aaf">jcopy_markers_execute()</a>, <a class="el" href="jpegInternal_8h.html#ac39445ce130600a507ce41e7f76c54da">jcopy_markers_setup()</a>, <a class="el" href="jpegInternal_8h_source.html#l00017">JCOPYOPT_COMMENTS</a>, <a class="el" href="jpegInternal_8h.html#a57beb980c0cf186d46e1dca71df4f156">jtransform_adjust_parameters()</a>, <a class="el" href="jpegInternal_8h.html#ac2a41f9bd0eba30af6992bdf94570d24">jtransform_execute_transformation()</a>, <a class="el" href="jpegInternal_8h.html#a758e220b145193fe08dd975f60421438">jtransform_request_workspace()</a>, <a class="el" href="jpegInternal_8h_source.html#l00024">JXFORM_FLIP_H</a>, <a class="el" href="jpegInternal_8h_source.html#l00025">JXFORM_FLIP_V</a>, <a class="el" href="jpegInternal_8h_source.html#l00030">JXFORM_ROT_270</a>, <a class="el" href="jpegInternal_8h_source.html#l00028">JXFORM_ROT_90</a>, <a class="el" href="imageTools_8h_source.html#l00027">ROTATE_270</a>, <a class="el" href="imageTools_8h_source.html#l00026">ROTATE_90</a>, <a class="el" href="jpegInternal_8h_source.html#l00067">jpeg_transform_info::transform</a>, and <a class="el" href="jpegInternal_8h_source.html#l00068">jpeg_transform_info::trim</a>.</p> <p>Referenced by <a class="el" href="imageTools_8cpp_source.html#l00112">transformImage()</a>.</p> <p><div class="fragment"><pre class="fragment"><a name="l00179"></a>00179 { <a name="l00180"></a>00180 <span class="keyword">struct </span>jpeg_decompress_struct srcinfo; <a name="l00181"></a>00181 <span class="keyword">struct </span>jpeg_compress_struct dstinfo; <a name="l00182"></a>00182 <span class="keyword">struct </span><a class="code" href="classjpeg__error__mgr.html">jpeg_error_mgr</a> jsrcerr, jdsterr; <a name="l00183"></a>00183 FILE * input_file; <a name="l00184"></a>00184 FILE * output_file; <a name="l00185"></a>00185 <a class="code" href="structjpeg__transform__info.html">jpeg_transform_info</a> transformoption; <a name="l00186"></a>00186 jvirt_barray_ptr * src_coef_arrays; <a name="l00187"></a>00187 jvirt_barray_ptr * dst_coef_arrays; <a name="l00188"></a>00188 <a name="l00189"></a>00189 <span class="comment">//setup transofrmation option struct, this was done in jpegtran by the</span> <a name="l00190"></a>00190 <span class="comment">//parse_switches function in jpegtran.c</span> <a name="l00191"></a>00191 <span class="keywordflow">switch</span>( transformation ) <a name="l00192"></a>00192 { <a name="l00193"></a>00193 <span class="keywordflow">case</span> <a class="code" href="imageTools_8h.html#ad6b8916a355278afb7cd35f14afc9288a685062467b0c1a3164556335b467c886">ROTATE_90</a>: <a name="l00194"></a>00194 transformoption.<a class="code" href="structjpeg__transform__info.html#aa3227394d9b01bae8543faf79e9c5fe8">transform</a> = <a class="code" href="jpegInternal_8h.html#a1133cd2487f1134aed16868dc1f04315af40c41fbed3c0713a2506c5a09b148eb">JXFORM_ROT_90</a>; <a name="l00195"></a>00195 <span class="keywordflow">break</span>; <a name="l00196"></a>00196 <span class="keywordflow">case</span> <a class="code" href="imageTools_8h.html#ad6b8916a355278afb7cd35f14afc9288a554e734d2a23790b248c5ce39816c18f">ROTATE_270</a>: <a name="l00197"></a>00197 transformoption.<a class="code" href="structjpeg__transform__info.html#aa3227394d9b01bae8543faf79e9c5fe8">transform</a> = <a class="code" href="jpegInternal_8h.html#a1133cd2487f1134aed16868dc1f04315a2f7ec56736e086e309eef1a593bd3e67">JXFORM_ROT_270</a>; <a name="l00198"></a>00198 <span class="keywordflow">break</span>; <a name="l00199"></a>00199 <span class="keywordflow">case</span> <a class="code" href="imageTools_8h.html#ad6b8916a355278afb7cd35f14afc9288aa02c13f8f08154ca2e58c488c922fbe5">FLIP_H</a>: <a name="l00200"></a>00200 transformoption.<a class="code" href="structjpeg__transform__info.html#aa3227394d9b01bae8543faf79e9c5fe8">transform</a> = <a class="code" href="jpegInternal_8h.html#a1133cd2487f1134aed16868dc1f04315a1f49341c48b481f2e8ed911840a3fbe3">JXFORM_FLIP_H</a>; <a name="l00201"></a>00201 <span class="keywordflow">break</span>; <a name="l00202"></a>00202 <span class="keywordflow">case</span> <a class="code" href="imageTools_8h.html#ad6b8916a355278afb7cd35f14afc9288a127171d15d7e5849705973e163393c71">FLIP_V</a>: <a name="l00203"></a>00203 transformoption.<a class="code" href="structjpeg__transform__info.html#aa3227394d9b01bae8543faf79e9c5fe8">transform</a> = <a class="code" href="jpegInternal_8h.html#a1133cd2487f1134aed16868dc1f04315ae522c3e42f2258a43ec693632f30cda4">JXFORM_FLIP_V</a>; <a name="l00204"></a>00204 <span class="keywordflow">break</span>; <a name="l00205"></a>00205 <span class="keywordflow">default</span>: <a name="l00206"></a>00206 <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00207"></a>00207 } <a name="l00208"></a>00208 transformoption.<a class="code" href="structjpeg__transform__info.html#a4f1f979322463d2c02a307047f0cf6b7">trim</a> = TRUE; <a name="l00209"></a>00209 transformoption.<a class="code" href="structjpeg__transform__info.html#a26d925edb18e0095056b38312fb86e53">force_grayscale</a> = FALSE; <a name="l00210"></a>00210 <a name="l00211"></a>00211 <span class="comment">// Initialize the JPEG decompression object with default error handling. </span> <a name="l00212"></a>00212 srcinfo.err = jpeg_std_error(&jsrcerr); <a name="l00213"></a>00213 jpeg_create_decompress(&srcinfo); <a name="l00214"></a>00214 <a name="l00215"></a>00215 <span class="comment">// Initialize the JPEG compression object with default error handling. </span> <a name="l00216"></a>00216 dstinfo.err = jpeg_std_error(&jdsterr); <a name="l00217"></a>00217 jpeg_create_compress(&dstinfo); <a name="l00218"></a>00218 <a name="l00220"></a>00220 <span class="comment">//what does this stuff do?</span> <a name="l00221"></a>00221 dstinfo.err->trace_level = 0; <a name="l00222"></a>00222 jsrcerr.trace_level = jdsterr.trace_level; <a name="l00223"></a>00223 srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use; <a name="l00225"></a>00225 <a name="l00226"></a>00226 <span class="comment">//open input and output files</span> <a name="l00227"></a>00227 <span class="keywordflow">if</span> ((input_file = fopen(QFile::encodeName(fileIn), <span class="stringliteral">"rb"</span>)) == NULL) <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00228"></a>00228 <span class="keywordflow">if</span> ((output_file = fopen(QFile::encodeName(fileOut), <span class="stringliteral">"wb"</span>)) == NULL) <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00229"></a>00229 <a name="l00230"></a>00230 <span class="comment">// Specify data source for decompression </span> <a name="l00231"></a>00231 jpeg_stdio_src(&srcinfo, input_file); <a name="l00232"></a>00232 <a name="l00233"></a>00233 <span class="comment">// Enable saving of extra markers that we want to copy </span> <a name="l00234"></a>00234 <a class="code" href="jpegInternal_8h.html#ac39445ce130600a507ce41e7f76c54da">jcopy_markers_setup</a>(&srcinfo, <a class="code" href="jpegInternal_8h.html#a65c3abad1d72d7ac3f89ef621613c553ac9a81502d8ebd4eae5acc77d9523ae42">JCOPYOPT_COMMENTS</a>); <a name="l00235"></a>00235 <a name="l00236"></a>00236 <span class="comment">// Read file header </span> <a name="l00237"></a>00237 (void) jpeg_read_header(&srcinfo, TRUE); <a name="l00238"></a>00238 <a name="l00239"></a>00239 <span class="comment">// Any space needed by a transform option must be requested before</span> <a name="l00240"></a>00240 <span class="comment">// jpeg_read_coefficients so that memory allocation will be done right.</span> <a name="l00241"></a>00241 <a class="code" href="jpegInternal_8h.html#a758e220b145193fe08dd975f60421438">jtransform_request_workspace</a>(&srcinfo, &transformoption); <a name="l00242"></a>00242 <a name="l00243"></a>00243 <span class="comment">// Read source file as DCT coefficients </span> <a name="l00244"></a>00244 src_coef_arrays = jpeg_read_coefficients(&srcinfo); <a name="l00245"></a>00245 <a name="l00246"></a>00246 <span class="comment">// Initialize destination compression parameters from source values </span> <a name="l00247"></a>00247 jpeg_copy_critical_parameters(&srcinfo, &dstinfo); <a name="l00248"></a>00248 <a name="l00249"></a>00249 <span class="comment">// Adjust destination parameters if required by transform options;</span> <a name="l00250"></a>00250 <span class="comment">// also find out which set of coefficient arrays will hold the output. </span> <a name="l00251"></a>00251 dst_coef_arrays = <a class="code" href="jpegInternal_8h.html#a57beb980c0cf186d46e1dca71df4f156">jtransform_adjust_parameters</a>(&dstinfo, src_coef_arrays, <a name="l00252"></a>00252 &transformoption); <a name="l00253"></a>00253 <a name="l00254"></a>00254 <span class="comment">// Specify data destination for compression </span> <a name="l00255"></a>00255 jpeg_stdio_dest(&dstinfo, output_file); <a name="l00256"></a>00256 <a name="l00257"></a>00257 <span class="comment">// Start compressor (note no image data is actually written here) </span> <a name="l00258"></a>00258 jpeg_write_coefficients(&dstinfo, dst_coef_arrays); <a name="l00259"></a>00259 <a name="l00260"></a>00260 <span class="comment">// Copy to the output file any extra markers that we want to preserve </span> <a name="l00261"></a>00261 <a class="code" href="jpegInternal_8h.html#a8b7f34edce3037c64a42d7de0af24aaf">jcopy_markers_execute</a>(&srcinfo, &dstinfo); <a name="l00262"></a>00262 <a name="l00263"></a>00263 <span class="comment">// Execute image transformation, if any </span> <a name="l00264"></a>00264 <a class="code" href="jpegInternal_8h.html#ac2a41f9bd0eba30af6992bdf94570d24">jtransform_execute_transformation</a>(&srcinfo, &dstinfo, <a name="l00265"></a>00265 src_coef_arrays, <a name="l00266"></a>00266 &transformoption); <a name="l00267"></a>00267 <a name="l00268"></a>00268 <span class="comment">// Finish compression and release memory </span> <a name="l00269"></a>00269 jpeg_finish_compress(&dstinfo); <a name="l00270"></a>00270 jpeg_destroy_compress(&dstinfo); <a name="l00271"></a>00271 (void) jpeg_finish_decompress(&srcinfo); <a name="l00272"></a>00272 jpeg_destroy_decompress(&srcinfo); <a name="l00273"></a>00273 <a name="l00274"></a>00274 <span class="comment">// Close files</span> <a name="l00275"></a>00275 fclose(input_file); <a name="l00276"></a>00276 fclose(output_file); <a name="l00277"></a>00277 <a name="l00278"></a>00278 <span class="comment">//success</span> <a name="l00279"></a>00279 <span class="keywordflow">return</span> <span class="keyword">true</span>; <a name="l00280"></a>00280 } </pre></div></p> </div> </div> </div> <hr size="1"/><address style="text-align: right;"><small>Generated by <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address> </body> </html>