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<h1>Source code for PIL.Jpeg2KImagePlugin</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"># JPEG2000 file handling</span>
<span class="c1">#</span>
<span class="c1"># History:</span>
<span class="c1"># 2014-03-12 ajh Created</span>
<span class="c1">#</span>
<span class="c1"># Copyright (c) 2014 Coriolis Systems Limited</span>
<span class="c1"># Copyright (c) 2014 Alastair Houghton</span>
<span class="c1">#</span>
<span class="c1"># See the README file for information on usage and redistribution.</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="kn">import</span> <span class="nn">struct</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">io</span>
<span class="n">__version__</span> <span class="o">=</span> <span class="s2">"0.1"</span>
<span class="k">def</span> <span class="nf">_parse_codestream</span><span class="p">(</span><span class="n">fp</span><span class="p">):</span>
<span class="sd">"""Parse the JPEG 2000 codestream to extract the size and component</span>
<span class="sd"> count from the SIZ marker segment, returning a PIL (size, mode) tuple."""</span>
<span class="n">hdr</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">2</span><span class="p">)</span>
<span class="n">lsiz</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'>H'</span><span class="p">,</span> <span class="n">hdr</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">siz</span> <span class="o">=</span> <span class="n">hdr</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="n">lsiz</span> <span class="o">-</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">lsiz</span><span class="p">,</span> <span class="n">rsiz</span><span class="p">,</span> <span class="n">xsiz</span><span class="p">,</span> <span class="n">ysiz</span><span class="p">,</span> <span class="n">xosiz</span><span class="p">,</span> <span class="n">yosiz</span><span class="p">,</span> <span class="n">xtsiz</span><span class="p">,</span> <span class="n">ytsiz</span><span class="p">,</span> \
<span class="n">xtosiz</span><span class="p">,</span> <span class="n">ytosiz</span><span class="p">,</span> <span class="n">csiz</span> \
<span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack_from</span><span class="p">(</span><span class="s1">'>HHIIIIIIIIH'</span><span class="p">,</span> <span class="n">siz</span><span class="p">)</span>
<span class="n">ssiz</span> <span class="o">=</span> <span class="p">[</span><span class="kc">None</span><span class="p">]</span><span class="o">*</span><span class="n">csiz</span>
<span class="n">xrsiz</span> <span class="o">=</span> <span class="p">[</span><span class="kc">None</span><span class="p">]</span><span class="o">*</span><span class="n">csiz</span>
<span class="n">yrsiz</span> <span class="o">=</span> <span class="p">[</span><span class="kc">None</span><span class="p">]</span><span class="o">*</span><span class="n">csiz</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">csiz</span><span class="p">):</span>
<span class="n">ssiz</span><span class="p">[</span><span class="n">i</span><span class="p">],</span> <span class="n">xrsiz</span><span class="p">[</span><span class="n">i</span><span class="p">],</span> <span class="n">yrsiz</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> \
<span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack_from</span><span class="p">(</span><span class="s1">'>BBB'</span><span class="p">,</span> <span class="n">siz</span><span class="p">,</span> <span class="mi">36</span> <span class="o">+</span> <span class="mi">3</span> <span class="o">*</span> <span class="n">i</span><span class="p">)</span>
<span class="n">size</span> <span class="o">=</span> <span class="p">(</span><span class="n">xsiz</span> <span class="o">-</span> <span class="n">xosiz</span><span class="p">,</span> <span class="n">ysiz</span> <span class="o">-</span> <span class="n">yosiz</span><span class="p">)</span>
<span class="k">if</span> <span class="n">csiz</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="k">if</span> <span class="p">(</span><span class="n">yrsiz</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">&</span> <span class="mh">0x7f</span><span class="p">)</span> <span class="o">></span> <span class="mi">8</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'I;16'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'L'</span>
<span class="k">elif</span> <span class="n">csiz</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'LA'</span>
<span class="k">elif</span> <span class="n">csiz</span> <span class="o">==</span> <span class="mi">3</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGB'</span>
<span class="k">elif</span> <span class="n">csiz</span> <span class="o">==</span> <span class="mi">4</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGBA'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">return</span> <span class="p">(</span><span class="n">size</span><span class="p">,</span> <span class="n">mode</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_parse_jp2_header</span><span class="p">(</span><span class="n">fp</span><span class="p">):</span>
<span class="sd">"""Parse the JP2 header box to extract size, component count and</span>
<span class="sd"> color space information, returning a PIL (size, mode) tuple."""</span>
<span class="c1"># Find the JP2 header box</span>
<span class="n">header</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">lbox</span><span class="p">,</span> <span class="n">tbox</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'>I4s'</span><span class="p">,</span> <span class="n">fp</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">8</span><span class="p">))</span>
<span class="k">if</span> <span class="n">lbox</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">lbox</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'>Q'</span><span class="p">,</span> <span class="n">fp</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">8</span><span class="p">))[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">hlen</span> <span class="o">=</span> <span class="mi">16</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">hlen</span> <span class="o">=</span> <span class="mi">8</span>
<span class="k">if</span> <span class="n">lbox</span> <span class="o"><</span> <span class="n">hlen</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SyntaxError</span><span class="p">(</span><span class="s1">'Invalid JP2 header length'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">tbox</span> <span class="o">==</span> <span class="sa">b</span><span class="s1">'jp2h'</span><span class="p">:</span>
<span class="n">header</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="n">lbox</span> <span class="o">-</span> <span class="n">hlen</span><span class="p">)</span>
<span class="k">break</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">fp</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="n">lbox</span> <span class="o">-</span> <span class="n">hlen</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">SEEK_CUR</span><span class="p">)</span>
<span class="k">if</span> <span class="n">header</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SyntaxError</span><span class="p">(</span><span class="s1">'could not find JP2 header'</span><span class="p">)</span>
<span class="n">size</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">mode</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">bpc</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">nc</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">hio</span> <span class="o">=</span> <span class="n">io</span><span class="o">.</span><span class="n">BytesIO</span><span class="p">(</span><span class="n">header</span><span class="p">)</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">lbox</span><span class="p">,</span> <span class="n">tbox</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'>I4s'</span><span class="p">,</span> <span class="n">hio</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">8</span><span class="p">))</span>
<span class="k">if</span> <span class="n">lbox</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">lbox</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'>Q'</span><span class="p">,</span> <span class="n">hio</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">8</span><span class="p">))[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">hlen</span> <span class="o">=</span> <span class="mi">16</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">hlen</span> <span class="o">=</span> <span class="mi">8</span>
<span class="n">content</span> <span class="o">=</span> <span class="n">hio</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">lbox</span> <span class="o">-</span> <span class="n">hlen</span><span class="p">)</span>
<span class="k">if</span> <span class="n">tbox</span> <span class="o">==</span> <span class="sa">b</span><span class="s1">'ihdr'</span><span class="p">:</span>
<span class="n">height</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="n">nc</span><span class="p">,</span> <span class="n">bpc</span><span class="p">,</span> <span class="n">c</span><span class="p">,</span> <span class="n">unkc</span><span class="p">,</span> <span class="n">ipr</span> \
<span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'>IIHBBBB'</span><span class="p">,</span> <span class="n">content</span><span class="p">)</span>
<span class="n">size</span> <span class="o">=</span> <span class="p">(</span><span class="n">width</span><span class="p">,</span> <span class="n">height</span><span class="p">)</span>
<span class="k">if</span> <span class="n">unkc</span><span class="p">:</span>
<span class="k">if</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">and</span> <span class="p">(</span><span class="n">bpc</span> <span class="o">&</span> <span class="mh">0x7f</span><span class="p">)</span> <span class="o">></span> <span class="mi">8</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'I;16'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'L'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'LA'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">3</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGB'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">4</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGBA'</span>
<span class="k">break</span>
<span class="k">elif</span> <span class="n">tbox</span> <span class="o">==</span> <span class="sa">b</span><span class="s1">'colr'</span><span class="p">:</span>
<span class="n">meth</span><span class="p">,</span> <span class="n">prec</span><span class="p">,</span> <span class="n">approx</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack_from</span><span class="p">(</span><span class="s1">'>BBB'</span><span class="p">,</span> <span class="n">content</span><span class="p">)</span>
<span class="k">if</span> <span class="n">meth</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">cs</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack_from</span><span class="p">(</span><span class="s1">'>I'</span><span class="p">,</span> <span class="n">content</span><span class="p">,</span> <span class="mi">3</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">if</span> <span class="n">cs</span> <span class="o">==</span> <span class="mi">16</span><span class="p">:</span> <span class="c1"># sRGB</span>
<span class="k">if</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">and</span> <span class="p">(</span><span class="n">bpc</span> <span class="o">&</span> <span class="mh">0x7f</span><span class="p">)</span> <span class="o">></span> <span class="mi">8</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'I;16'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'L'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">3</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGB'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">4</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGBA'</span>
<span class="k">break</span>
<span class="k">elif</span> <span class="n">cs</span> <span class="o">==</span> <span class="mi">17</span><span class="p">:</span> <span class="c1"># grayscale</span>
<span class="k">if</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">and</span> <span class="p">(</span><span class="n">bpc</span> <span class="o">&</span> <span class="mh">0x7f</span><span class="p">)</span> <span class="o">></span> <span class="mi">8</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'I;16'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'L'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'LA'</span>
<span class="k">break</span>
<span class="k">elif</span> <span class="n">cs</span> <span class="o">==</span> <span class="mi">18</span><span class="p">:</span> <span class="c1"># sYCC</span>
<span class="k">if</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">3</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGB'</span>
<span class="k">elif</span> <span class="n">nc</span> <span class="o">==</span> <span class="mi">4</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGBA'</span>
<span class="k">break</span>
<span class="k">if</span> <span class="n">size</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">or</span> <span class="n">mode</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SyntaxError</span><span class="p">(</span><span class="s2">"Malformed jp2 header"</span><span class="p">)</span>
<span class="k">return</span> <span class="p">(</span><span class="n">size</span><span class="p">,</span> <span class="n">mode</span><span class="p">)</span>
<span class="c1">##</span>
<span class="c1"># Image plugin for JPEG2000 images.</span>
<div class="viewcode-block" id="Jpeg2KImageFile"><a class="viewcode-back" href="../../reference/plugins.html#PIL.Jpeg2KImagePlugin.Jpeg2KImageFile">[docs]</a><span class="k">class</span> <span class="nc">Jpeg2KImageFile</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">"JPEG2000"</span>
<span class="n">format_description</span> <span class="o">=</span> <span class="s2">"JPEG 2000 (ISO 15444)"</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="n">sig</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">read</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
<span class="k">if</span> <span class="n">sig</span> <span class="o">==</span> <span class="sa">b</span><span class="s1">'</span><span class="se">\xff\x4f\xff\x51</span><span class="s1">'</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">codec</span> <span class="o">=</span> <span class="s2">"j2k"</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">mode</span> <span class="o">=</span> <span class="n">_parse_codestream</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">sig</span> <span class="o">=</span> <span class="n">sig</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">read</span><span class="p">(</span><span class="mi">8</span><span class="p">)</span>
<span class="k">if</span> <span class="n">sig</span> <span class="o">==</span> <span class="sa">b</span><span class="s1">'</span><span class="se">\x00\x00\x00\x0c</span><span class="s1">jP </span><span class="se">\x0d\x0a\x87\x0a</span><span class="s1">'</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">codec</span> <span class="o">=</span> <span class="s2">"jp2"</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">mode</span> <span class="o">=</span> <span class="n">_parse_jp2_header</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SyntaxError</span><span class="p">(</span><span class="s1">'not a JPEG 2000 file'</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">size</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SyntaxError</span><span class="p">(</span><span class="s1">'unable to determine size/mode'</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">reduce</span> <span class="o">=</span> <span class="mi">0</span>
<span class="bp">self</span><span class="o">.</span><span class="n">layers</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">fd</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="n">length</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">fd</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">fileno</span><span class="p">()</span>
<span class="n">length</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">fstat</span><span class="p">(</span><span class="n">fd</span><span class="p">)</span><span class="o">.</span><span class="n">st_size</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="n">fd</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">pos</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">tell</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">seek</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">length</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">tell</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">seek</span><span class="p">(</span><span class="n">pos</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="n">length</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</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="s1">'jpeg2k'</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="mi">0</span><span class="p">,</span>
<span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">codec</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">reduce</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">layers</span><span class="p">,</span> <span class="n">fd</span><span class="p">,</span> <span class="n">length</span><span class="p">))]</span>
<div class="viewcode-block" id="Jpeg2KImageFile.load"><a class="viewcode-back" href="../../reference/plugins.html#PIL.Jpeg2KImagePlugin.Jpeg2KImageFile.load">[docs]</a> <span class="k">def</span> <span class="nf">load</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">reduce</span><span class="p">:</span>
<span class="n">power</span> <span class="o">=</span> <span class="mi">1</span> <span class="o"><<</span> <span class="bp">self</span><span class="o">.</span><span class="n">reduce</span>
<span class="n">adjust</span> <span class="o">=</span> <span class="n">power</span> <span class="o">>></span> <span class="mi">1</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_size</span> <span class="o">=</span> <span class="p">(</span><span class="nb">int</span><span class="p">((</span><span class="bp">self</span><span class="o">.</span><span class="n">size</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">+</span> <span class="n">adjust</span><span class="p">)</span> <span class="o">/</span> <span class="n">power</span><span class="p">),</span>
<span class="nb">int</span><span class="p">((</span><span class="bp">self</span><span class="o">.</span><span class="n">size</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span> <span class="n">adjust</span><span class="p">)</span> <span class="o">/</span> <span class="n">power</span><span class="p">))</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">tile</span><span class="p">:</span>
<span class="c1"># Update the reduce and layers settings</span>
<span class="n">t</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">tile</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">t3</span> <span class="o">=</span> <span class="p">(</span><span class="n">t</span><span class="p">[</span><span class="mi">3</span><span class="p">][</span><span class="mi">0</span><span class="p">],</span> <span class="bp">self</span><span class="o">.</span><span class="n">reduce</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">layers</span><span class="p">,</span> <span class="n">t</span><span class="p">[</span><span class="mi">3</span><span class="p">][</span><span class="mi">3</span><span class="p">],</span> <span class="n">t</span><span class="p">[</span><span class="mi">3</span><span class="p">][</span><span class="mi">4</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="n">t</span><span class="p">[</span><span class="mi">0</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="n">t</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">t3</span><span class="p">)]</span>
<span class="k">return</span> <span class="n">ImageFile</span><span class="o">.</span><span class="n">ImageFile</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span></div></div>
<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="p">(</span><span class="n">prefix</span><span class="p">[:</span><span class="mi">4</span><span class="p">]</span> <span class="o">==</span> <span class="sa">b</span><span class="s1">'</span><span class="se">\xff\x4f\xff\x51</span><span class="s1">'</span> <span class="ow">or</span>
<span class="n">prefix</span><span class="p">[:</span><span class="mi">12</span><span class="p">]</span> <span class="o">==</span> <span class="sa">b</span><span class="s1">'</span><span class="se">\x00\x00\x00\x0c</span><span class="s1">jP </span><span class="se">\x0d\x0a\x87\x0a</span><span class="s1">'</span><span class="p">)</span>
<span class="c1"># ------------------------------------------------------------</span>
<span class="c1"># Save support</span>
<span class="k">def</span> <span class="nf">_save</span><span class="p">(</span><span class="n">im</span><span class="p">,</span> <span class="n">fp</span><span class="p">,</span> <span class="n">filename</span><span class="p">):</span>
<span class="k">if</span> <span class="n">filename</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s1">'.j2k'</span><span class="p">):</span>
<span class="n">kind</span> <span class="o">=</span> <span class="s1">'j2k'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">kind</span> <span class="o">=</span> <span class="s1">'jp2'</span>
<span class="c1"># Get the keyword arguments</span>
<span class="n">info</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">encoderinfo</span>
<span class="n">offset</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'offset'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">tile_offset</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'tile_offset'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">tile_size</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'tile_size'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">quality_mode</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'quality_mode'</span><span class="p">,</span> <span class="s1">'rates'</span><span class="p">)</span>
<span class="n">quality_layers</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'quality_layers'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">quality_layers</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="ow">not</span> <span class="p">(</span>
<span class="nb">isinstance</span><span class="p">(</span><span class="n">quality_layers</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">))</span> <span class="ow">and</span>
<span class="nb">all</span><span class="p">([</span><span class="nb">isinstance</span><span class="p">(</span><span class="n">quality_layer</span><span class="p">,</span> <span class="p">(</span><span class="nb">int</span><span class="p">,</span> <span class="nb">float</span><span class="p">))</span>
<span class="k">for</span> <span class="n">quality_layer</span> <span class="ow">in</span> <span class="n">quality_layers</span><span class="p">])</span>
<span class="p">):</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'quality_layers must be a sequence of numbers'</span><span class="p">)</span>
<span class="n">num_resolutions</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'num_resolutions'</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="n">cblk_size</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'codeblock_size'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">precinct_size</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'precinct_size'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">irreversible</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'irreversible'</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
<span class="n">progression</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'progression'</span><span class="p">,</span> <span class="s1">'LRCP'</span><span class="p">)</span>
<span class="n">cinema_mode</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'cinema_mode'</span><span class="p">,</span> <span class="s1">'no'</span><span class="p">)</span>
<span class="n">fd</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">fp</span><span class="p">,</span> <span class="s2">"fileno"</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">fd</span> <span class="o">=</span> <span class="n">fp</span><span class="o">.</span><span class="n">fileno</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="n">fd</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="n">im</span><span class="o">.</span><span class="n">encoderconfig</span> <span class="o">=</span> <span class="p">(</span>
<span class="n">offset</span><span class="p">,</span>
<span class="n">tile_offset</span><span class="p">,</span>
<span class="n">tile_size</span><span class="p">,</span>
<span class="n">quality_mode</span><span class="p">,</span>
<span class="n">quality_layers</span><span class="p">,</span>
<span class="n">num_resolutions</span><span class="p">,</span>
<span class="n">cblk_size</span><span class="p">,</span>
<span class="n">precinct_size</span><span class="p">,</span>
<span class="n">irreversible</span><span class="p">,</span>
<span class="n">progression</span><span class="p">,</span>
<span class="n">cinema_mode</span><span class="p">,</span>
<span class="n">fd</span>
<span class="p">)</span>
<span class="n">ImageFile</span><span class="o">.</span><span class="n">_save</span><span class="p">(</span><span class="n">im</span><span class="p">,</span> <span class="n">fp</span><span class="p">,</span> <span class="p">[(</span><span class="s1">'jpeg2k'</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="n">im</span><span class="o">.</span><span class="n">size</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="n">kind</span><span class="p">)])</span>
<span class="c1"># ------------------------------------------------------------</span>
<span class="c1"># Registry stuff</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_open</span><span class="p">(</span><span class="n">Jpeg2KImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="n">Jpeg2KImageFile</span><span class="p">,</span> <span class="n">_accept</span><span class="p">)</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_save</span><span class="p">(</span><span class="n">Jpeg2KImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="n">_save</span><span class="p">)</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_extensions</span><span class="p">(</span><span class="n">Jpeg2KImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span>
<span class="p">[</span><span class="s2">".jp2"</span><span class="p">,</span> <span class="s2">".j2k"</span><span class="p">,</span> <span class="s2">".jpc"</span><span class="p">,</span> <span class="s2">".jpf"</span><span class="p">,</span> <span class="s2">".jpx"</span><span class="p">,</span> <span class="s2">".j2c"</span><span class="p">])</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_mime</span><span class="p">(</span><span class="n">Jpeg2KImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="s1">'image/jp2'</span><span class="p">)</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_mime</span><span class="p">(</span><span class="n">Jpeg2KImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="s1">'image/jpx'</span><span class="p">)</span>
</pre></div>
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