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<h1>Rendering slideshows, WMF, EMF and EMF+</h1>
<div id="front-matter"></div>
<div class="note">
<div class="label">Note</div>
<div class="content">Please be aware, that the documentation on this page reflects the current development, which might not
have been released. If you rely on an unreleased feature, either use a
<a href="../../download.html">nightly development build</a> or feel free to ask on the
<a href="../../help/index.html">mailing list</a> for the release schedule.</div>
</div>
<a name="Rendering+slideshows%2C+WMF%2C+EMF+and+EMF%2B"></a>
<h2 class="boxed">Rendering slideshows, WMF, EMF and EMF+</h2>
<div class="section">
<p>
For rendering slideshow (HSLF/XSLF), WMF, EMF and EMF+ pictures, POI provides an utility class
<a href="https://github.com/apache/poi/tree/trunk/poi-ooxml/src/main/java/org/apache/poi/xslf/util/PPTX2PNG.java?view=markup">
PPTX2PNG</a>:
</p>
<div class="code">
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">Usage: PPTX2PNG [options] &lt;.ppt/.pptx/.emf/.wmf file or 'stdin'&gt;</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">Options:</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -scale &lt;float&gt; scale factor</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -fixSide &lt;side&gt; specify side (long,short,width,height) to fix - use &lt;scale&gt; as amount of pixels</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -slide &lt;integer&gt; 1-based index of a slide to render</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -format &lt;type&gt; png,gif,jpg,svg,pdf (log,null for testing)</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -outdir &lt;dir&gt; output directory, defaults to origin of the ppt/pptx file</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -outfile &lt;file&gt; output filename, defaults to "${basename}-${slideno}.${format}"</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -outpat &lt;pattern&gt; output filename pattern, defaults to "${basename}-${slideno}.${format}"</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> patterns: basename, slideno, format, ext</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -dump &lt;file&gt; dump the annotated records to a file</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -quiet do not write to console (for normal processing)</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -ignoreParse ignore parsing error and continue with the records read until the error</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -extractEmbedded extract embedded parts</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -inputType &lt;type&gt; default input file type (OLE2,WMF,EMF), default is OLE2 = Powerpoint</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> some files (usually wmf) don't have a header, i.e. an identifiable file magic</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -textAsShapes text elements are saved as shapes in SVG, necessary for variable spacing</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> often found in math formulas</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -charset &lt;cs&gt; sets the default charset to be used, defaults to Windows-1252</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -emfHeaderBounds force the usage of the emf header bounds to calculate the bounding box</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -fontdir &lt;dir&gt; (PDF only) font directories separated by ";" - use $HOME for current users home dir</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> defaults to the usual plattform directories</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -fontTtf &lt;regex&gt; (PDF only) regex to match the .ttf filenames</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> -fontMap &lt;map&gt; ";"-separated list of font mappings &lt;typeface from&gt;:&lt;typeface to&gt;</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
</div>
<a name="Instructions+to+run"></a>
<h3 class="boxed">Instructions to run</h3>
<p>
Download the <a href="https://ci-builds.apache.org/job/POI/job/POI-DSL-1.8/lastSuccessfulBuild/artifact/build/dist/">current nightly</a>
and for SVG/PDF the <a href="../../components/index.html#components">additional dependencies</a>.</p>
<p>Execute the java command (Unix-paths needs to be replaced for Windows - use "-charset" for non-western WMF/EMFs):</p>
<div class="code">
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">java -cp poi-5.5.1.jar:poi-ooxml-5.5.1.jar:poi-ooxml-lite-5.5.1.jar:poi-scratchpad-5.5.1.jar:lib/*:ooxml-lib/*:auxiliary/* org.apache.poi.xslf.util.PPTX2PNG -format png -fixside long -scale 1000 -charset GBK file.pptx</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
</div>
<p>
If you want to use the renderer on the module path (JPMS) there a currently a few more steps necessary:
</p>
<ul>
<li>Create a build project using Maven, Gradle or your favorite build tool.</li>
<li>Alternatively, download the jars from https://repo1.maven.org/maven2/org/apache/poi/</li>
<li>Exclude poi-ooxml-full-5.5.1.jar,poi-javadoc-5.5.1.jar and auxiliary/xml-apis-1.4.01.jar (Java 11+) into new subdirectory "unused"</li>
<li>Move all other jars in current directory into a new subdirectory "poi"</li>
<li>Invoke PPTX2PNG:
<div class="code">
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">java --module-path poi:lib:auxiliary:ooxml-lib --module org.apache.poi.ooxml/org.apache.poi.xslf.util.PPTX2PNG -format png -fixside long -scale 1000 file.pptx</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
</div>
</li>
</ul>
<div class="note">
<div class="label">Note</div>
<div class="content">
JDK 1.8 is by default using the PiscesRenderingEngine and affected by
<a href="https://github.com/AdoptOpenJDK/openjdk-build/issues/716">Busy loop hangs</a>.
To workaround this, use the MarlinRenderingEngine which is experimental provided starting from
<a href="https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8143849">openjdk8u252 (JDK-8143849)</a>
via <span class="codefrag">-Dsun.java2d.renderer=sun.java2d.marlin.MarlinRenderingEngine</span> or for older jdk builds,
<a href="https://github.com/bourgesl/marlin-renderer/wiki/How-to-use">preload the marlin jar</a>.
</div>
</div>
</div>
<a name="Integrate+rendering+in+your+code"></a>
<h2 class="boxed">Integrate rendering in your code</h2>
<div class="section">
<a name="%231+-+Use+PPTX2PNG+via+file+or+stdin"></a>
<h3 class="boxed">#1 - Use PPTX2PNG via file or stdin</h3>
<p>For file system access, you need to save your slideshow/WMF/EMF/EMF+ first to disc and then call <span class="codefrag">
PPTX2PNG.main()
</span> with the corresponding parameters.
</p>
<p>for stdin access, you need to redirect <span class="codefrag">System.in</span> before:
</p>
<div class="code">
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">/* the file content */</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">InputStream is = ...;</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">/* Save and set System.in */</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">InputStream oldIn = System.in;</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">try {</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> System.setIn(is);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> String[] args = {</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> "-format", "png", // png,gif,jpg,svg or null for test</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> "-outdir", new File("out/").getCanonicalPath(),</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> "-outfile", "export.png",</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> "-fixside", "long",</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> "-scale", "800",</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> "-ignoreParse",</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> "stdin"</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> };</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> PPTX2PNG.main(args);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">} finally {</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> System.setIn(oldIn);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">}</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
</div>
<a name="%232+-+Render+WMF+%2F+EMF+%2F+EMF%2B+via+the+*Picture+classes"></a>
<h3 class="boxed">#2 - Render WMF / EMF / EMF+ via the *Picture classes</h3>
<div class="code">
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">File f = samples.getFile("santa.wmf");</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">try (FileInputStream fis = new FileInputStream(f)) {</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> // for WMF</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> HwmfPicture wmf = new HwmfPicture(fis);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> // for EMF / EMF+</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> HemfPicture emf = new HemfPicture(fis);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> Dimension dim = wmf.getSize();</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> int width = Units.pointsToPixel(dim.getWidth());</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> // keep aspect ratio for height</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> int height = Units.pointsToPixel(dim.getHeight());</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> double max = Math.max(width, height);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> if (max &gt; 1500) {</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> width *= 1500/max;</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> height *= 1500/max;</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> }</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> BufferedImage bufImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> Graphics2D g = bufImg.createGraphics();</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> wmf.draw(g, new Rectangle2D.Double(0,0,width,height));</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> g.dispose();</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> ImageIO.write(bufImg, "PNG", new File("bla.png"));</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">}</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
</div>
<a name="%233+-+Render+slideshows+directly"></a>
<h3 class="boxed">#3 - Render slideshows directly</h3>
<div class="code">
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">File file = new File("example.pptx");</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">double scale = 1.5;</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">try (SlideShow&lt;?, ?&gt; ss = SlideShowFactory.create(file, null, true)) {</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> Dimension pgsize = ss.getPageSize();</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> int width = (int) (pgsize.width * scale);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> int height = (int) (pgsize.height * scale);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> for (Slide&lt;?, ?&gt; slide : ss.getSlides()) {</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> Graphics2D graphics = img.createGraphics();</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> // default rendering options</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> graphics.setRenderingHint(Drawable.BUFFERED_IMAGE, new WeakReference&lt;&gt;(img));</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> graphics.scale(scale, scale);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> // draw stuff</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> slide.draw(graphics);</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> ImageIO.write(img, "PNG", new File("output.png"));</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> graphics.dispose();</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> img.flush();</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"> }</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody">}</span>
</div>
<div class="codeline">
<span class="lineno"></span><span class="codebody"></span>
</div>
</div>
</div>
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