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<h1>psd.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* This file is part of the KDE project</span>
<a name="l00002"></a>00002 <span class="comment">   Copyright (C) 2003 Ignacio CastaƱo &lt;castano@ludicon.com&gt;</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment">   This program is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment">   modify it under the terms of the Lesser GNU General Public</span>
<a name="l00006"></a>00006 <span class="comment">   License as published by the Free Software Foundation; either</span>
<a name="l00007"></a>00007 <span class="comment">   version 2 of the License, or (at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment">   This code is based on Thacher Ulrich PSD loading code released</span>
<a name="l00010"></a>00010 <span class="comment">   on public domain. See: http://tulrich.com/geekstuff/</span>
<a name="l00011"></a>00011 <span class="comment">*/</span>
<a name="l00012"></a>00012 
<a name="l00013"></a>00013 <span class="comment">/* this code supports:</span>
<a name="l00014"></a>00014 <span class="comment"> * reading:</span>
<a name="l00015"></a>00015 <span class="comment"> *     rle and raw psd files</span>
<a name="l00016"></a>00016 <span class="comment"> * writing:</span>
<a name="l00017"></a>00017 <span class="comment"> *     not supported</span>
<a name="l00018"></a>00018 <span class="comment"> */</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="preprocessor">#include "psd.h"</span>
<a name="l00021"></a>00021 
<a name="l00022"></a>00022 <span class="preprocessor">#include &lt;qimage.h&gt;</span>
<a name="l00023"></a>00023 <span class="preprocessor">#include &lt;qdatastream.h&gt;</span>
<a name="l00024"></a>00024 
<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;kdebug.h&gt;</span>
<a name="l00026"></a>00026 
<a name="l00027"></a>00027 <span class="keyword">typedef</span> Q_UINT32 uint;
<a name="l00028"></a>00028 <span class="keyword">typedef</span> Q_UINT16 ushort;
<a name="l00029"></a>00029 <span class="keyword">typedef</span> Q_UINT8 uchar;
<a name="l00030"></a>00030 
<a name="l00031"></a>00031 <span class="keyword">namespace </span>{ <span class="comment">// Private.</span>
<a name="l00032"></a>00032 
<a name="l00033"></a>00033     <span class="keyword">enum</span> ColorMode {
<a name="l00034"></a>00034         CM_BITMAP = 0,
<a name="l00035"></a>00035         CM_GRAYSCALE = 1,
<a name="l00036"></a>00036         CM_INDEXED = 2,
<a name="l00037"></a>00037         CM_RGB = 3,
<a name="l00038"></a>00038         CM_CMYK = 4,
<a name="l00039"></a>00039         CM_MULTICHANNEL = 7,
<a name="l00040"></a>00040         CM_DUOTONE = 8,
<a name="l00041"></a>00041         CM_LABCOLOR = 9
<a name="l00042"></a>00042     };
<a name="l00043"></a>00043 
<a name="l00044"></a>00044     <span class="keyword">struct </span>PSDHeader {
<a name="l00045"></a>00045         uint signature;
<a name="l00046"></a>00046         ushort version;
<a name="l00047"></a>00047         uchar reserved[6];
<a name="l00048"></a>00048         ushort channel_count;
<a name="l00049"></a>00049         uint height;
<a name="l00050"></a>00050         uint width;
<a name="l00051"></a>00051         ushort depth;
<a name="l00052"></a>00052         ushort color_mode;
<a name="l00053"></a>00053     };
<a name="l00054"></a>00054     
<a name="l00055"></a>00055     <span class="keyword">static</span> <a class="codeRef" doxygen="qt.tag:" href="qdatastream.html">QDataStream</a> &amp; operator&gt;&gt; ( <a class="codeRef" doxygen="qt.tag:" href="qdatastream.html">QDataStream</a> &amp; s, PSDHeader &amp; header )
<a name="l00056"></a>00056     {
<a name="l00057"></a>00057         s &gt;&gt; header.signature;
<a name="l00058"></a>00058         s &gt;&gt; header.version;
<a name="l00059"></a>00059         <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = 0; i &lt; 6; i++ ) {
<a name="l00060"></a>00060             s &gt;&gt; header.reserved[i];
<a name="l00061"></a>00061         }
<a name="l00062"></a>00062         s &gt;&gt; header.channel_count;
<a name="l00063"></a>00063         s &gt;&gt; header.height;
<a name="l00064"></a>00064         s &gt;&gt; header.width;
<a name="l00065"></a>00065         s &gt;&gt; header.depth;
<a name="l00066"></a>00066         s &gt;&gt; header.color_mode;
<a name="l00067"></a>00067         <span class="keywordflow">return</span> s;
<a name="l00068"></a>00068     }
<a name="l00069"></a>00069         <span class="keyword">static</span> <span class="keywordtype">bool</span> seekBy(<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html">QDataStream</a>&amp; s, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bytes)
<a name="l00070"></a>00070         {
<a name="l00071"></a>00071                 <span class="keywordtype">char</span> buf[4096];
<a name="l00072"></a>00072                 <span class="keywordflow">while</span> (bytes) {
<a name="l00073"></a>00073                         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> num= QMIN(bytes,<span class="keyword">sizeof</span>(buf));
<a name="l00074"></a>00074                         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> l = num;
<a name="l00075"></a>00075                         s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#readRawBytes">readRawBytes</a>(buf, l);
<a name="l00076"></a>00076                         <span class="keywordflow">if</span>(l != num)
<a name="l00077"></a>00077                           <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00078"></a>00078                         bytes -= num;
<a name="l00079"></a>00079                 }
<a name="l00080"></a>00080                 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00081"></a>00081         }
<a name="l00082"></a>00082 
<a name="l00083"></a>00083     <span class="comment">// Check that the header is a valid PSD.</span>
<a name="l00084"></a>00084     <span class="keyword">static</span> <span class="keywordtype">bool</span> IsValid( <span class="keyword">const</span> PSDHeader &amp; header )
<a name="l00085"></a>00085     {
<a name="l00086"></a>00086         <span class="keywordflow">if</span>( header.signature != 0x38425053 ) {  <span class="comment">// '8BPS'</span>
<a name="l00087"></a>00087             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00088"></a>00088         }
<a name="l00089"></a>00089         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00090"></a>00090     }
<a name="l00091"></a>00091 
<a name="l00092"></a>00092     <span class="comment">// Check that the header is supported.</span>
<a name="l00093"></a>00093     <span class="keyword">static</span> <span class="keywordtype">bool</span> IsSupported( <span class="keyword">const</span> PSDHeader &amp; header )
<a name="l00094"></a>00094     {
<a name="l00095"></a>00095         <span class="keywordflow">if</span>( header.version != 1 ) {
<a name="l00096"></a>00096             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00097"></a>00097         }
<a name="l00098"></a>00098         <span class="keywordflow">if</span>( header.channel_count &gt; 16 ) {
<a name="l00099"></a>00099             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00100"></a>00100         }
<a name="l00101"></a>00101         <span class="keywordflow">if</span>( header.depth != 8 ) {
<a name="l00102"></a>00102             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00103"></a>00103         }
<a name="l00104"></a>00104         <span class="keywordflow">if</span>( header.color_mode != CM_RGB ) {
<a name="l00105"></a>00105             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00106"></a>00106         }
<a name="l00107"></a>00107         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00108"></a>00108     }
<a name="l00109"></a>00109 
<a name="l00110"></a>00110     <span class="comment">// Load the PSD image.</span>
<a name="l00111"></a>00111     <span class="keyword">static</span> <span class="keywordtype">bool</span> LoadPSD( <a class="codeRef" doxygen="qt.tag:" href="qdatastream.html">QDataStream</a> &amp; s, <span class="keyword">const</span> PSDHeader &amp; header, <a class="codeRef" doxygen="qt.tag:" href="qimage.html">QImage</a> &amp; img )
<a name="l00112"></a>00112     {
<a name="l00113"></a>00113         <span class="comment">// Create dst image.</span>
<a name="l00114"></a>00114         <span class="keywordflow">if</span>( !img.<a class="codeRef" doxygen="qt.tag:" href="qimage.html#create">create</a>( header.width, header.height, 32 )) {
<a name="l00115"></a>00115             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00116"></a>00116         }
<a name="l00117"></a>00117     
<a name="l00118"></a>00118         uint tmp;
<a name="l00119"></a>00119 
<a name="l00120"></a>00120         <span class="comment">// Skip mode data.</span>
<a name="l00121"></a>00121         s &gt;&gt; tmp;
<a name="l00122"></a>00122         s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#device">device</a>()-&gt;at( s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#device">device</a>()-&gt;at() + tmp );
<a name="l00123"></a>00123 
<a name="l00124"></a>00124         <span class="comment">// Skip image resources.</span>
<a name="l00125"></a>00125         s &gt;&gt; tmp;
<a name="l00126"></a>00126         s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#device">device</a>()-&gt;at( s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#device">device</a>()-&gt;at() + tmp );
<a name="l00127"></a>00127 
<a name="l00128"></a>00128         <span class="comment">// Skip the reserved data.</span>
<a name="l00129"></a>00129         s &gt;&gt; tmp;
<a name="l00130"></a>00130         s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#device">device</a>()-&gt;at( s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#device">device</a>()-&gt;at() + tmp );
<a name="l00131"></a>00131         
<a name="l00132"></a>00132         <span class="comment">// Find out if the data is compressed.</span>
<a name="l00133"></a>00133         <span class="comment">// Known values:</span>
<a name="l00134"></a>00134         <span class="comment">//   0: no compression</span>
<a name="l00135"></a>00135         <span class="comment">//   1: RLE compressed</span>
<a name="l00136"></a>00136         ushort compression;
<a name="l00137"></a>00137         s &gt;&gt; compression;
<a name="l00138"></a>00138         
<a name="l00139"></a>00139         <span class="keywordflow">if</span>( compression &gt; 1 ) {
<a name="l00140"></a>00140             <span class="comment">// Unknown compression type.</span>
<a name="l00141"></a>00141             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00142"></a>00142         }
<a name="l00143"></a>00143 
<a name="l00144"></a>00144         uint channel_num = header.channel_count;
<a name="l00145"></a>00145         
<a name="l00146"></a>00146         <span class="comment">// Clear the image.</span>
<a name="l00147"></a>00147         <span class="keywordflow">if</span>( channel_num &lt; 4 ) {
<a name="l00148"></a>00148             img.<a class="codeRef" doxygen="qt.tag:" href="qimage.html#fill">fill</a>(qRgba(0, 0, 0, 0xFF));
<a name="l00149"></a>00149         }
<a name="l00150"></a>00150         <span class="keywordflow">else</span> {
<a name="l00151"></a>00151             <span class="comment">// Enable alpha.        </span>
<a name="l00152"></a>00152             img.<a class="codeRef" doxygen="qt.tag:" href="qimage.html#setAlphaBuffer">setAlphaBuffer</a>( <span class="keyword">true</span> );
<a name="l00153"></a>00153             
<a name="l00154"></a>00154             <span class="comment">// Ignore the other channels.</span>
<a name="l00155"></a>00155             channel_num = 4;            
<a name="l00156"></a>00156         }
<a name="l00157"></a>00157         
<a name="l00158"></a>00158         <span class="keyword">const</span> uint pixel_count = header.height * header.width;
<a name="l00159"></a>00159         
<a name="l00160"></a>00160         <span class="keyword">static</span> <span class="keyword">const</span> uint components[4] = {2, 1, 0, 3}; <span class="comment">// @@ Is this endian dependant?</span>
<a name="l00161"></a>00161         
<a name="l00162"></a>00162         <span class="keywordflow">if</span>( compression ) {
<a name="l00163"></a>00163         
<a name="l00164"></a>00164             <span class="comment">// Skip row lengths.</span>
<a name="l00165"></a>00165                         <span class="keywordflow">if</span>(!seekBy(s, header.height*header.channel_count*<span class="keyword">sizeof</span>(ushort)))
<a name="l00166"></a>00166                                 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00167"></a>00167 
<a name="l00168"></a>00168             <span class="comment">// Read RLE data.                       </span>
<a name="l00169"></a>00169             <span class="keywordflow">for</span>(uint channel = 0; channel &lt; channel_num; channel++) {
<a name="l00170"></a>00170             
<a name="l00171"></a>00171                 uchar * ptr = img.<a class="codeRef" doxygen="qt.tag:" href="qimage.html#bits">bits</a>() + components[channel];
<a name="l00172"></a>00172                 
<a name="l00173"></a>00173                 uint count = 0;
<a name="l00174"></a>00174                 <span class="keywordflow">while</span>( count &lt; pixel_count ) {
<a name="l00175"></a>00175                     uchar c;
<a name="l00176"></a>00176                                         <span class="keywordflow">if</span>(s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#atEnd">atEnd</a>())
<a name="l00177"></a>00177                                                 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00178"></a>00178                     s &gt;&gt; c;
<a name="l00179"></a>00179                     uint len = c;
<a name="l00180"></a>00180                     
<a name="l00181"></a>00181                     <span class="keywordflow">if</span>( len &lt; 128 ) {
<a name="l00182"></a>00182                         <span class="comment">// Copy next len+1 bytes literally.</span>
<a name="l00183"></a>00183                         len++;
<a name="l00184"></a>00184                         count += len;
<a name="l00185"></a>00185                                                 <span class="keywordflow">if</span> ( count &gt; pixel_count )
<a name="l00186"></a>00186                                                         <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00187"></a>00187 
<a name="l00188"></a>00188                         <span class="keywordflow">while</span>( len != 0 ) {
<a name="l00189"></a>00189                             s &gt;&gt; *ptr;
<a name="l00190"></a>00190                             ptr += 4;
<a name="l00191"></a>00191                             len--;
<a name="l00192"></a>00192                         }
<a name="l00193"></a>00193                     } 
<a name="l00194"></a>00194                     <span class="keywordflow">else</span> <span class="keywordflow">if</span>( len &gt; 128 ) {
<a name="l00195"></a>00195                         <span class="comment">// Next -len+1 bytes in the dest are replicated from next source byte.</span>
<a name="l00196"></a>00196                         <span class="comment">// (Interpret len as a negative 8-bit int.)</span>
<a name="l00197"></a>00197                         len ^= 0xFF;
<a name="l00198"></a>00198                         len += 2;
<a name="l00199"></a>00199                         count += len;
<a name="l00200"></a>00200                                                 <span class="keywordflow">if</span>(s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#atEnd">atEnd</a>() || count &gt; pixel_count)
<a name="l00201"></a>00201                                                         <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00202"></a>00202                         uchar val;
<a name="l00203"></a>00203                         s &gt;&gt; val;
<a name="l00204"></a>00204                         <span class="keywordflow">while</span>( len != 0 ) {
<a name="l00205"></a>00205                             *ptr = val;
<a name="l00206"></a>00206                             ptr += 4;
<a name="l00207"></a>00207                             len--;
<a name="l00208"></a>00208                         }
<a name="l00209"></a>00209                     }
<a name="l00210"></a>00210                     <span class="keywordflow">else</span> <span class="keywordflow">if</span>( len == 128 ) {
<a name="l00211"></a>00211                         <span class="comment">// No-op.</span>
<a name="l00212"></a>00212                     }
<a name="l00213"></a>00213                 }
<a name="l00214"></a>00214             }
<a name="l00215"></a>00215         }
<a name="l00216"></a>00216         <span class="keywordflow">else</span> {
<a name="l00217"></a>00217             <span class="comment">// We're at the raw image data.  It's each channel in order (Red, Green, Blue, Alpha, ...)</span>
<a name="l00218"></a>00218             <span class="comment">// where each channel consists of an 8-bit value for each pixel in the image.</span>
<a name="l00219"></a>00219 
<a name="l00220"></a>00220             <span class="comment">// Read the data by channel.</span>
<a name="l00221"></a>00221             <span class="keywordflow">for</span>(uint channel = 0; channel &lt; channel_num; channel++) {
<a name="l00222"></a>00222 
<a name="l00223"></a>00223                 uchar * ptr = img.<a class="codeRef" doxygen="qt.tag:" href="qimage.html#bits">bits</a>() + components[channel];
<a name="l00224"></a>00224             
<a name="l00225"></a>00225                 <span class="comment">// Read the data.</span>
<a name="l00226"></a>00226                 uint count = pixel_count;
<a name="l00227"></a>00227                 <span class="keywordflow">while</span>( count != 0 ) {
<a name="l00228"></a>00228                     s &gt;&gt; *ptr;
<a name="l00229"></a>00229                     ptr += 4;
<a name="l00230"></a>00230                     count--;
<a name="l00231"></a>00231                 }
<a name="l00232"></a>00232             }
<a name="l00233"></a>00233         }
<a name="l00234"></a>00234 
<a name="l00235"></a>00235         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00236"></a>00236     }
<a name="l00237"></a>00237 
<a name="l00238"></a>00238 } <span class="comment">// Private</span>
<a name="l00239"></a>00239 
<a name="l00240"></a>00240 
<a name="l00241"></a>00241 <span class="keywordtype">void</span> kimgio_psd_read( <a class="codeRef" doxygen="qt.tag:" href="qimageio.html">QImageIO</a> *io )
<a name="l00242"></a>00242 {
<a name="l00243"></a>00243     <a class="codeRef" doxygen="qt.tag:" href="qdatastream.html">QDataStream</a> s( io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#ioDevice">ioDevice</a>() );
<a name="l00244"></a>00244     s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#setByteOrder">setByteOrder</a>( QDataStream::BigEndian );
<a name="l00245"></a>00245 
<a name="l00246"></a>00246     PSDHeader header;
<a name="l00247"></a>00247     s &gt;&gt; header;
<a name="l00248"></a>00248 
<a name="l00249"></a>00249     <span class="comment">// Check image file format.</span>
<a name="l00250"></a>00250     <span class="keywordflow">if</span>( s.<a class="codeRef" doxygen="qt.tag:" href="qdatastream.html#atEnd">atEnd</a>() || !IsValid( header ) ) {
<a name="l00251"></a>00251         kdDebug(399) &lt;&lt; <span class="stringliteral">"This PSD file is not valid."</span> &lt;&lt; endl;
<a name="l00252"></a>00252         io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setImage">setImage</a>( 0 );
<a name="l00253"></a>00253         io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setStatus">setStatus</a>( -1 );
<a name="l00254"></a>00254         <span class="keywordflow">return</span>;
<a name="l00255"></a>00255     }
<a name="l00256"></a>00256 
<a name="l00257"></a>00257     <span class="comment">// Check if it's a supported format.</span>
<a name="l00258"></a>00258     <span class="keywordflow">if</span>( !IsSupported( header ) ) {
<a name="l00259"></a>00259         kdDebug(399) &lt;&lt; <span class="stringliteral">"This PSD file is not supported."</span> &lt;&lt; endl;
<a name="l00260"></a>00260         io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setImage">setImage</a>( 0 );
<a name="l00261"></a>00261         io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setStatus">setStatus</a>( -1 );
<a name="l00262"></a>00262         <span class="keywordflow">return</span>;
<a name="l00263"></a>00263     }
<a name="l00264"></a>00264 
<a name="l00265"></a>00265     <a class="codeRef" doxygen="qt.tag:" href="qimage.html">QImage</a> img;
<a name="l00266"></a>00266     <span class="keywordflow">if</span>( !LoadPSD(s, header, img) ) {
<a name="l00267"></a>00267         kdDebug(399) &lt;&lt; <span class="stringliteral">"Error loading PSD file."</span> &lt;&lt; endl;
<a name="l00268"></a>00268         io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setImage">setImage</a>( 0 );
<a name="l00269"></a>00269         io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setStatus">setStatus</a>( -1 );
<a name="l00270"></a>00270         <span class="keywordflow">return</span>;
<a name="l00271"></a>00271     }
<a name="l00272"></a>00272 
<a name="l00273"></a>00273     io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setImage">setImage</a>( img );
<a name="l00274"></a>00274     io-&gt;<a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setStatus">setStatus</a>( 0 );
<a name="l00275"></a>00275 }
<a name="l00276"></a>00276 
<a name="l00277"></a>00277 
<a name="l00278"></a>00278 <span class="keywordtype">void</span> kimgio_psd_write( <a class="codeRef" doxygen="qt.tag:" href="qimageio.html">QImageIO</a> * )
<a name="l00279"></a>00279 {
<a name="l00280"></a>00280     <span class="comment">// TODO Stub!</span>
<a name="l00281"></a>00281 }
<a name="l00282"></a>00282 
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