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<h1>Source code for django.core.files.images</h1><div class="highlight"><pre>
<span class="sd">"""</span>
<span class="sd">Utility functions for handling images.</span>
<span class="sd">Requires Pillow (or PIL), as you might imagine.</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">zlib</span>
<span class="kn">from</span> <span class="nn">django.core.files</span> <span class="kn">import</span> <span class="n">File</span>
<div class="viewcode-block" id="ImageFile"><a class="viewcode-back" href="../../../../ref/files/file.html#django.core.files.images.ImageFile">[docs]</a><span class="k">class</span> <span class="nc">ImageFile</span><span class="p">(</span><span class="n">File</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A mixin for use alongside django.core.files.base.File, which provides</span>
<span class="sd"> additional features for dealing with images.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">_get_width</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_image_dimensions</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">width</span> <span class="o">=</span> <span class="nb">property</span><span class="p">(</span><span class="n">_get_width</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_get_height</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_image_dimensions</span><span class="p">()[</span><span class="mi">1</span><span class="p">]</span>
<span class="n">height</span> <span class="o">=</span> <span class="nb">property</span><span class="p">(</span><span class="n">_get_height</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_get_image_dimensions</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s">'_dimensions_cache'</span><span class="p">):</span>
<span class="n">close</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">closed</span>
<span class="bp">self</span><span class="o">.</span><span class="n">open</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_dimensions_cache</span> <span class="o">=</span> <span class="n">get_image_dimensions</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">close</span><span class="o">=</span><span class="n">close</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_dimensions_cache</span>
</div>
<span class="k">def</span> <span class="nf">get_image_dimensions</span><span class="p">(</span><span class="n">file_or_path</span><span class="p">,</span> <span class="n">close</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns the (width, height) of an image, given an open file or a path. Set</span>
<span class="sd"> 'close' to True to close the file at the end if it is initially in an open</span>
<span class="sd"> state.</span>
<span class="sd"> """</span>
<span class="kn">from</span> <span class="nn">django.utils.image</span> <span class="kn">import</span> <span class="n">ImageFile</span> <span class="k">as</span> <span class="n">PILImageFile</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">PILImageFile</span><span class="o">.</span><span class="n">Parser</span><span class="p">()</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">file_or_path</span><span class="p">,</span> <span class="s">'read'</span><span class="p">):</span>
<span class="nb">file</span> <span class="o">=</span> <span class="n">file_or_path</span>
<span class="n">file_pos</span> <span class="o">=</span> <span class="nb">file</span><span class="o">.</span><span class="n">tell</span><span class="p">()</span>
<span class="nb">file</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="k">else</span><span class="p">:</span>
<span class="nb">file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">file_or_path</span><span class="p">,</span> <span class="s">'rb'</span><span class="p">)</span>
<span class="n">close</span> <span class="o">=</span> <span class="bp">True</span>
<span class="k">try</span><span class="p">:</span>
<span class="c"># Most of the time PIL only needs a small chunk to parse the image and</span>
<span class="c"># get the dimensions, but with some TIFF files PIL needs to parse the</span>
<span class="c"># whole file.</span>
<span class="n">chunk_size</span> <span class="o">=</span> <span class="mi">1024</span>
<span class="k">while</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">data</span> <span class="o">=</span> <span class="nb">file</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">chunk_size</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">data</span><span class="p">:</span>
<span class="k">break</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">p</span><span class="o">.</span><span class="n">feed</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
<span class="k">except</span> <span class="n">zlib</span><span class="o">.</span><span class="n">error</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
<span class="c"># ignore zlib complaining on truncated stream, just feed more</span>
<span class="c"># data to parser (ticket #19457).</span>
<span class="k">if</span> <span class="n">e</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s">"Error -5"</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span>
<span class="k">if</span> <span class="n">p</span><span class="o">.</span><span class="n">image</span><span class="p">:</span>
<span class="k">return</span> <span class="n">p</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">size</span>
<span class="n">chunk_size</span> <span class="o">=</span> <span class="n">chunk_size</span><span class="o">*</span><span class="mi">2</span>
<span class="k">return</span> <span class="bp">None</span>
<span class="k">finally</span><span class="p">:</span>
<span class="k">if</span> <span class="n">close</span><span class="p">:</span>
<span class="nb">file</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="nb">file</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="n">file_pos</span><span class="p">)</span>
</pre></div>
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