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<h1>Source code for PIL.XVThumbImagePlugin</h1><div class="highlight"><pre>
<span></span><span class="c1">#</span>
<span class="c1"># The Python Imaging Library.</span>
<span class="c1"># $Id$</span>
<span class="c1">#</span>
<span class="c1"># XV Thumbnail file handler by Charles E. "Gene" Cash</span>
<span class="c1"># (gcash@magicnet.net)</span>
<span class="c1">#</span>
<span class="c1"># see xvcolor.c and xvbrowse.c in the sources to John Bradley's XV,</span>
<span class="c1"># available from ftp://ftp.cis.upenn.edu/pub/xv/</span>
<span class="c1">#</span>
<span class="c1"># history:</span>
<span class="c1"># 98-08-15 cec created (b/w only)</span>
<span class="c1"># 98-12-09 cec added color palette</span>
<span class="c1"># 98-12-28 fl added to PIL (with only a few very minor modifications)</span>
<span class="c1">#</span>
<span class="c1"># To do:</span>
<span class="c1"># FIXME: make save work (this requires quantization support)</span>
<span class="c1">#</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="k">import</span> <span class="n">Image</span><span class="p">,</span> <span class="n">ImageFile</span><span class="p">,</span> <span class="n">ImagePalette</span>
<span class="kn">from</span> <span class="nn">._binary</span> <span class="k">import</span> <span class="n">i8</span><span class="p">,</span> <span class="n">o8</span>
<span class="n">__version__</span> <span class="o">=</span> <span class="s2">"0.1"</span>
<span class="n">_MAGIC</span> <span class="o">=</span> <span class="sa">b</span><span class="s2">"P7 332"</span>
<span class="c1"># standard color palette for thumbnails (RGB332)</span>
<span class="n">PALETTE</span> <span class="o">=</span> <span class="sa">b</span><span class="s2">""</span>
<span class="k">for</span> <span class="n">r</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">8</span><span class="p">):</span>
<span class="k">for</span> <span class="n">g</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">8</span><span class="p">):</span>
<span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">4</span><span class="p">):</span>
<span class="n">PALETTE</span> <span class="o">=</span> <span class="n">PALETTE</span> <span class="o">+</span> <span class="p">(</span><span class="n">o8</span><span class="p">((</span><span class="n">r</span><span class="o">*</span><span class="mi">255</span><span class="p">)</span><span class="o">//</span><span class="mi">7</span><span class="p">)</span><span class="o">+</span><span class="n">o8</span><span class="p">((</span><span class="n">g</span><span class="o">*</span><span class="mi">255</span><span class="p">)</span><span class="o">//</span><span class="mi">7</span><span class="p">)</span><span class="o">+</span><span class="n">o8</span><span class="p">((</span><span class="n">b</span><span class="o">*</span><span class="mi">255</span><span class="p">)</span><span class="o">//</span><span class="mi">3</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">_accept</span><span class="p">(</span><span class="n">prefix</span><span class="p">):</span>
<span class="k">return</span> <span class="n">prefix</span><span class="p">[:</span><span class="mi">6</span><span class="p">]</span> <span class="o">==</span> <span class="n">_MAGIC</span>
<span class="c1">##</span>
<span class="c1"># Image plugin for XV thumbnail images.</span>
<div class="viewcode-block" id="XVThumbImageFile"><a class="viewcode-back" href="../../reference/plugins.html#PIL.XVThumbImagePlugin.XVThumbImageFile">[docs]</a><span class="k">class</span> <span class="nc">XVThumbImageFile</span><span class="p">(</span><span class="n">ImageFile</span><span class="o">.</span><span class="n">ImageFile</span><span class="p">):</span>
<span class="nb">format</span> <span class="o">=</span> <span class="s2">"XVThumb"</span>
<span class="n">format_description</span> <span class="o">=</span> <span class="s2">"XV thumbnail image"</span>
<span class="k">def</span> <span class="nf">_open</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># check magic</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">_accept</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">6</span><span class="p">)):</span>
<span class="k">raise</span> <span class="ne">SyntaxError</span><span class="p">(</span><span class="s2">"not an XV thumbnail file"</span><span class="p">)</span>
<span class="c1"># Skip to beginning of next line</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="o">.</span><span class="n">readline</span><span class="p">()</span>
<span class="c1"># skip info comments</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">s</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="o">.</span><span class="n">readline</span><span class="p">()</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">s</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SyntaxError</span><span class="p">(</span><span class="s2">"Unexpected EOF reading XV thumbnail file"</span><span class="p">)</span>
<span class="k">if</span> <span class="n">i8</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="o">!=</span> <span class="mi">35</span><span class="p">:</span> <span class="c1"># ie. when not a comment: '#'</span>
<span class="k">break</span>
<span class="c1"># parse header line (already read)</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">mode</span> <span class="o">=</span> <span class="s2">"P"</span>
<span class="bp">self</span><span class="o">.</span><span class="n">size</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">0</span><span class="p">]),</span> <span class="nb">int</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="bp">self</span><span class="o">.</span><span class="n">palette</span> <span class="o">=</span> <span class="n">ImagePalette</span><span class="o">.</span><span class="n">raw</span><span class="p">(</span><span class="s2">"RGB"</span><span class="p">,</span> <span class="n">PALETTE</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">tile</span> <span class="o">=</span> <span class="p">[</span>
<span class="p">(</span><span class="s2">"raw"</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span><span class="o">+</span><span class="bp">self</span><span class="o">.</span><span class="n">size</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="o">.</span><span class="n">tell</span><span class="p">(),</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="p">)]</span></div>
<span class="c1"># --------------------------------------------------------------------</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_open</span><span class="p">(</span><span class="n">XVThumbImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="n">XVThumbImageFile</span><span class="p">,</span> <span class="n">_accept</span><span class="p">)</span>
</pre></div>
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