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<h1>Source code for PIL.ImageWin</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"># a Windows DIB display interface</span>
<span class="c1">#</span>
<span class="c1"># History:</span>
<span class="c1"># 1996-05-20 fl Created</span>
<span class="c1"># 1996-09-20 fl Fixed subregion exposure</span>
<span class="c1"># 1997-09-21 fl Added draw primitive (for tzPrint)</span>
<span class="c1"># 2003-05-21 fl Added experimental Window/ImageWindow classes</span>
<span class="c1"># 2003-09-05 fl Added fromstring/tostring methods</span>
<span class="c1">#</span>
<span class="c1"># Copyright (c) Secret Labs AB 1997-2003.</span>
<span class="c1"># Copyright (c) Fredrik Lundh 1996-2003.</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>
<div class="viewcode-block" id="HDC"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.HDC">[docs]</a><span class="k">class</span> <span class="nc">HDC</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Wraps an HDC integer. The resulting object can be passed to the</span>
<span class="sd"> :py:meth:`~PIL.ImageWin.Dib.draw` and :py:meth:`~PIL.ImageWin.Dib.expose`</span>
<span class="sd"> methods.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dc</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">dc</span> <span class="o">=</span> <span class="n">dc</span>
<span class="k">def</span> <span class="nf">__int__</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">dc</span></div>
<div class="viewcode-block" id="HWND"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.HWND">[docs]</a><span class="k">class</span> <span class="nc">HWND</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Wraps an HWND integer. The resulting object can be passed to the</span>
<span class="sd"> :py:meth:`~PIL.ImageWin.Dib.draw` and :py:meth:`~PIL.ImageWin.Dib.expose`</span>
<span class="sd"> methods, instead of a DC.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">wnd</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">wnd</span> <span class="o">=</span> <span class="n">wnd</span>
<span class="k">def</span> <span class="nf">__int__</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">wnd</span></div>
<div class="viewcode-block" id="Dib"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.Dib">[docs]</a><span class="k">class</span> <span class="nc">Dib</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A Windows bitmap with the given mode and size. The mode can be one of "1",</span>
<span class="sd"> "L", "P", or "RGB".</span>
<span class="sd"> If the display requires a palette, this constructor creates a suitable</span>
<span class="sd"> palette and associates it with the image. For an "L" image, 128 greylevels</span>
<span class="sd"> are allocated. For an "RGB" image, a 6x6x6 colour cube is used, together</span>
<span class="sd"> with 20 greylevels.</span>
<span class="sd"> To make sure that palettes work properly under Windows, you must call the</span>
<span class="sd"> **palette** method upon certain events from Windows.</span>
<span class="sd"> :param image: Either a PIL image, or a mode string. If a mode string is</span>
<span class="sd"> used, a size must also be given. The mode can be one of "1",</span>
<span class="sd"> "L", "P", or "RGB".</span>
<span class="sd"> :param size: If the first argument is a mode string, this</span>
<span class="sd"> defines the size of the image.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">image</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">image</span><span class="p">,</span> <span class="s2">"mode"</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">image</span><span class="p">,</span> <span class="s2">"size"</span><span class="p">):</span>
<span class="n">mode</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">mode</span>
<span class="n">size</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">size</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="n">image</span>
<span class="n">image</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">if</span> <span class="n">mode</span> <span class="ow">not</span> <span class="ow">in</span> <span class="p">[</span><span class="s2">"1"</span><span class="p">,</span> <span class="s2">"L"</span><span class="p">,</span> <span class="s2">"P"</span><span class="p">,</span> <span class="s2">"RGB"</span><span class="p">]:</span>
<span class="n">mode</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">getmodebase</span><span class="p">(</span><span class="n">mode</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">image</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">display</span><span class="p">(</span><span class="n">mode</span><span class="p">,</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">mode</span>
<span class="bp">self</span><span class="o">.</span><span class="n">size</span> <span class="o">=</span> <span class="n">size</span>
<span class="k">if</span> <span class="n">image</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">paste</span><span class="p">(</span><span class="n">image</span><span class="p">)</span>
<div class="viewcode-block" id="Dib.expose"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.Dib.expose">[docs]</a> <span class="k">def</span> <span class="nf">expose</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handle</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Copy the bitmap contents to a device context.</span>
<span class="sd"> :param handle: Device context (HDC), cast to a Python integer, or an</span>
<span class="sd"> HDC or HWND instance. In PythonWin, you can use the</span>
<span class="sd"> :py:meth:`CDC.GetHandleAttrib` to get a suitable handle.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">handle</span><span class="p">,</span> <span class="n">HWND</span><span class="p">):</span>
<span class="n">dc</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">getdc</span><span class="p">(</span><span class="n">handle</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">expose</span><span class="p">(</span><span class="n">dc</span><span class="p">)</span>
<span class="k">finally</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">releasedc</span><span class="p">(</span><span class="n">handle</span><span class="p">,</span> <span class="n">dc</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">expose</span><span class="p">(</span><span class="n">handle</span><span class="p">)</span>
<span class="k">return</span> <span class="n">result</span></div>
<div class="viewcode-block" id="Dib.draw"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.Dib.draw">[docs]</a> <span class="k">def</span> <span class="nf">draw</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handle</span><span class="p">,</span> <span class="n">dst</span><span class="p">,</span> <span class="n">src</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Same as expose, but allows you to specify where to draw the image, and</span>
<span class="sd"> what part of it to draw.</span>
<span class="sd"> The destination and source areas are given as 4-tuple rectangles. If</span>
<span class="sd"> the source is omitted, the entire image is copied. If the source and</span>
<span class="sd"> the destination have different sizes, the image is resized as</span>
<span class="sd"> necessary.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">src</span><span class="p">:</span>
<span class="n">src</span> <span class="o">=</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="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">handle</span><span class="p">,</span> <span class="n">HWND</span><span class="p">):</span>
<span class="n">dc</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">getdc</span><span class="p">(</span><span class="n">handle</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">draw</span><span class="p">(</span><span class="n">dc</span><span class="p">,</span> <span class="n">dst</span><span class="p">,</span> <span class="n">src</span><span class="p">)</span>
<span class="k">finally</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">releasedc</span><span class="p">(</span><span class="n">handle</span><span class="p">,</span> <span class="n">dc</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">draw</span><span class="p">(</span><span class="n">handle</span><span class="p">,</span> <span class="n">dst</span><span class="p">,</span> <span class="n">src</span><span class="p">)</span>
<span class="k">return</span> <span class="n">result</span></div>
<div class="viewcode-block" id="Dib.query_palette"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.Dib.query_palette">[docs]</a> <span class="k">def</span> <span class="nf">query_palette</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">handle</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Installs the palette associated with the image in the given device</span>
<span class="sd"> context.</span>
<span class="sd"> This method should be called upon **QUERYNEWPALETTE** and</span>
<span class="sd"> **PALETTECHANGED** events from Windows. If this method returns a</span>
<span class="sd"> non-zero value, one or more display palette entries were changed, and</span>
<span class="sd"> the image should be redrawn.</span>
<span class="sd"> :param handle: Device context (HDC), cast to a Python integer, or an</span>
<span class="sd"> HDC or HWND instance.</span>
<span class="sd"> :return: A true value if one or more entries were changed (this</span>
<span class="sd"> indicates that the image should be redrawn).</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">handle</span><span class="p">,</span> <span class="n">HWND</span><span class="p">):</span>
<span class="n">handle</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">getdc</span><span class="p">(</span><span class="n">handle</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">query_palette</span><span class="p">(</span><span class="n">handle</span><span class="p">)</span>
<span class="k">finally</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">releasedc</span><span class="p">(</span><span class="n">handle</span><span class="p">,</span> <span class="n">handle</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">query_palette</span><span class="p">(</span><span class="n">handle</span><span class="p">)</span>
<span class="k">return</span> <span class="n">result</span></div>
<div class="viewcode-block" id="Dib.paste"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.Dib.paste">[docs]</a> <span class="k">def</span> <span class="nf">paste</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">im</span><span class="p">,</span> <span class="n">box</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Paste a PIL image into the bitmap image.</span>
<span class="sd"> :param im: A PIL image. The size must match the target region.</span>
<span class="sd"> If the mode does not match, the image is converted to the</span>
<span class="sd"> mode of the bitmap image.</span>
<span class="sd"> :param box: A 4-tuple defining the left, upper, right, and</span>
<span class="sd"> lower pixel coordinate. See :ref:`coordinate-system`. If</span>
<span class="sd"> None is given instead of a tuple, all of the image is</span>
<span class="sd"> assumed.</span>
<span class="sd"> """</span>
<span class="n">im</span><span class="o">.</span><span class="n">load</span><span class="p">()</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span> <span class="o">!=</span> <span class="n">im</span><span class="o">.</span><span class="n">mode</span><span class="p">:</span>
<span class="n">im</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">convert</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="k">if</span> <span class="n">box</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">paste</span><span class="p">(</span><span class="n">im</span><span class="o">.</span><span class="n">im</span><span class="p">,</span> <span class="n">box</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">paste</span><span class="p">(</span><span class="n">im</span><span class="o">.</span><span class="n">im</span><span class="p">)</span></div>
<div class="viewcode-block" id="Dib.frombytes"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.Dib.frombytes">[docs]</a> <span class="k">def</span> <span class="nf">frombytes</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">buffer</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Load display memory contents from byte data.</span>
<span class="sd"> :param buffer: A buffer containing display data (usually</span>
<span class="sd"> data returned from <b>tobytes</b>)</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">frombytes</span><span class="p">(</span><span class="n">buffer</span><span class="p">)</span></div>
<div class="viewcode-block" id="Dib.tobytes"><a class="viewcode-back" href="../../reference/ImageWin.html#PIL.ImageWin.Dib.tobytes">[docs]</a> <span class="k">def</span> <span class="nf">tobytes</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Copy display memory contents to bytes object.</span>
<span class="sd"> :return: A bytes object containing display data.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">tobytes</span><span class="p">()</span></div></div>
<span class="k">class</span> <span class="nc">Window</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""Create a Window with the given title size."""</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">title</span><span class="o">=</span><span class="s2">"PIL"</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">height</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">hwnd</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">createwindow</span><span class="p">(</span>
<span class="n">title</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__dispatcher</span><span class="p">,</span> <span class="n">width</span> <span class="ow">or</span> <span class="mi">0</span><span class="p">,</span> <span class="n">height</span> <span class="ow">or</span> <span class="mi">0</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">__dispatcher</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">action</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s2">"ui_handle_"</span> <span class="o">+</span> <span class="n">action</span><span class="p">)(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">ui_handle_clear</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dc</span><span class="p">,</span> <span class="n">x0</span><span class="p">,</span> <span class="n">y0</span><span class="p">,</span> <span class="n">x1</span><span class="p">,</span> <span class="n">y1</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">def</span> <span class="nf">ui_handle_damage</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x0</span><span class="p">,</span> <span class="n">y0</span><span class="p">,</span> <span class="n">x1</span><span class="p">,</span> <span class="n">y1</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">def</span> <span class="nf">ui_handle_destroy</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">def</span> <span class="nf">ui_handle_repair</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dc</span><span class="p">,</span> <span class="n">x0</span><span class="p">,</span> <span class="n">y0</span><span class="p">,</span> <span class="n">x1</span><span class="p">,</span> <span class="n">y1</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">def</span> <span class="nf">ui_handle_resize</span><span class="p">(</span><span class="bp">self</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">pass</span>
<span class="k">def</span> <span class="nf">mainloop</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">Image</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">eventloop</span><span class="p">()</span>
<span class="k">class</span> <span class="nc">ImageWindow</span><span class="p">(</span><span class="n">Window</span><span class="p">):</span>
<span class="sd">"""Create an image window which displays the given image."""</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">image</span><span class="p">,</span> <span class="n">title</span><span class="o">=</span><span class="s2">"PIL"</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">image</span><span class="p">,</span> <span class="n">Dib</span><span class="p">):</span>
<span class="n">image</span> <span class="o">=</span> <span class="n">Dib</span><span class="p">(</span><span class="n">image</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">image</span> <span class="o">=</span> <span class="n">image</span>
<span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">size</span>
<span class="n">Window</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">title</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="n">width</span><span class="p">,</span> <span class="n">height</span><span class="o">=</span><span class="n">height</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">ui_handle_repair</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dc</span><span class="p">,</span> <span class="n">x0</span><span class="p">,</span> <span class="n">y0</span><span class="p">,</span> <span class="n">x1</span><span class="p">,</span> <span class="n">y1</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">draw</span><span class="p">(</span><span class="n">dc</span><span class="p">,</span> <span class="p">(</span><span class="n">x0</span><span class="p">,</span> <span class="n">y0</span><span class="p">,</span> <span class="n">x1</span><span class="p">,</span> <span class="n">y1</span><span class="p">))</span>
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