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<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V2.0//EN" "document-v20.dtd">

<document>
    <header>
        <title>Rendering slideshows, WMF, EMF and EMF+</title>
    </header>
    <body>
        <note>Please be aware, that the documentation on this page reflects the current development, which might not
            have been released. If you rely on a unreleased feature, either use a
            <a href="site:download">nightly development build</a> or feel free to ask on the
            <a href="site:mailinglists">mailing list</a> for the release schedule.</note>
        <section>
            <title>Rendering slideshows, WMF, EMF and EMF+</title>
            <p>
                For rendering slideshow (HSLF/XSLF), WMF, EMF and EMF+ pictures, POI provides an utility class
                <a href="https://svn.apache.org/viewvc/poi/trunk/poi-ooxml/src/main/java/org/apache/poi/xslf/util/PPTX2PNG.java?view=markup">
                    PPTX2PNG</a>:
            </p>

            <source><![CDATA[
                Usage: PPTX2PNG [options] <.ppt/.pptx/.emf/.wmf file or 'stdin'>

                Options:
                    -scale <float>    scale factor
                    -fixSide <side>   specify side (long,short,width,height) to fix - use <scale> as amount of pixels
                    -slide <integer>  1-based index of a slide to render
                    -format <type>    png,gif,jpg,svg,pdf (log,null for testing)
                    -outdir <dir>     output directory, defaults to origin of the ppt/pptx file
                    -outfile <file>   output filename, defaults to "${basename}-${slideno}.${format}"
                    -outpat <pattern> output filename pattern, defaults to "${basename}-${slideno}.${format}"
                                      patterns: basename, slideno, format, ext
                    -dump <file>      dump the annotated records to a file
                    -quiet            do not write to console (for normal processing)
                    -ignoreParse      ignore parsing error and continue with the records read until the error
                    -extractEmbedded  extract embedded parts
                    -inputType <type> default input file type (OLE2,WMF,EMF), default is OLE2 = Powerpoint
                                      some files (usually wmf) don't have a header, i.e. an identifiable file magic
                    -textAsShapes     text elements are saved as shapes in SVG, necessary for variable spacing
                                      often found in math formulas
                    -charset <cs>     sets the default charset to be used, defaults to Windows-1252
                    -emfHeaderBounds  force the usage of the emf header bounds to calculate the bounding box

                    -fontdir <dir>    (PDF only) font directories separated by ";" - use $HOME for current users home dir
                                      defaults to the usual plattform directories
                    -fontTtf <regex>  (PDF only) regex to match the .ttf filenames
                    -fontMap <map>    ";"-separated list of font mappings <typeface from>:<typeface to>
                ]]>
            </source>

            <section>
                <title>Instructions to run</title>
                <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="site:components/index/batikpdf">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>
                <source>
                    java -cp poi-5.2.1.jar:poi-ooxml-5.2.1.jar:poi-ooxml-schemas-5.2.1.jar:poi-scratchpad-5.2.1.jar:lib/*:ooxml-lib/*:auxiliary/* org.apache.poi.xslf.util.PPTX2PNG -format png -fixside long -scale 1000 -charset GBK file.pptx
                </source>
                <p>
                    If you want to use the renderer on the module path (JPMS) there a currently a few more steps necessary:
                </p>
                <ul>
                    <li>Extract poi-bin-....zip to a directory (= current directory)</li>
                    <li>Move poi-ooxml-full-5.2.1.jar,poi-javadoc-5.2.1.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>Remove auxiliary/batik-script-1.14.jar:/META-INF/services/org.apache.batik.script.InterpreterFactory - see <a href="https://issues.apache.org/jira/browse/BATIK-1260">BATIK-1260</a></li>
                    <li>Invoke PPTX2PNG:
                        <source>
                            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
                        </source>
                    </li>
                </ul>
                <note>
                    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 thise, 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 <code>-Dsun.java2d.renderer=sun.java2d.marlin.MarlinRenderingEngine</code> or for older jdk builds,
                    <a href="https://github.com/bourgesl/marlin-renderer/wiki/How-to-use">preload the marlin jar</a>.
                </note>
            </section>

        </section>
        <section>
            <title>Integrate rendering in your code</title>
            <section>
                <title>#1 - Use PPTX2PNG via file or stdin</title>
                <p>For file system access, you need to save your slideshow/WMF/EMF/EMF+ first to disc and then call <code>
                    PPTX2PNG.main()
                </code> with the corresponding parameters.
                </p>

                <p>for stdin access, you need to redirect <code>System.in</code> before:
                </p>
                <source><![CDATA[
                    /* the file content */
                    InputStream is = ...;
                    /* Save and set System.in */
                    InputStream oldIn = System.in;
                    try {
                        System.setIn(is);

                        String[] args = {
                            "-format", "png", // png,gif,jpg,svg or null for test
                            "-outdir", new File("out/").getCanonicalPath(),
                            "-outfile", "export.png",
                            "-fixside", "long",
                            "-scale", "800",
                            "-ignoreParse",
                            "stdin"
                        };
                        PPTX2PNG.main(args);

                    } finally {
                        System.setIn(oldIn);
                    }
                ]]></source>
            </section>
            <section>
                <title>#2 - Render WMF / EMF / EMF+ via the *Picture classes</title>
                <source><![CDATA[
                    File f = samples.getFile("santa.wmf");
                    try (FileInputStream fis = new FileInputStream(f)) {
                        // for WMF
                        HwmfPicture wmf = new HwmfPicture(fis);

                        // for EMF / EMF+
                        HemfPicture emf = new HemfPicture(fis);

                        Dimension dim = wmf.getSize();
                        int width = Units.pointsToPixel(dim.getWidth());
                        // keep aspect ratio for height
                        int height = Units.pointsToPixel(dim.getHeight());
                        double max = Math.max(width, height);
                        if (max > 1500) {
                        width *= 1500/max;
                        height *= 1500/max;
                        }

                        BufferedImage bufImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
                        Graphics2D g = bufImg.createGraphics();
                        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                        g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
                        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
                        g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);

                        wmf.draw(g, new Rectangle2D.Double(0,0,width,height));

                        g.dispose();

                        ImageIO.write(bufImg, "PNG", new File("bla.png"));
                    }
                    ]]>
                </source>
            </section>
            <section>
                <title>#3 - Render slideshows directly</title>
                <source><![CDATA[
                    File file = new File("example.pptx");
                    double scale = 1.5;
                    try (SlideShow<?, ?> ss = SlideShowFactory.create(file, null, true)) {
                        Dimension pgsize = ss.getPageSize();
                        int width = (int) (pgsize.width * scale);
                        int height = (int) (pgsize.height * scale);

                        for (Slide<?, ?> slide : ss.getSlides()) {
                            BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
                            Graphics2D graphics = img.createGraphics();

                            // default rendering options
                            graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                            graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
                            graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
                            graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
                            graphics.setRenderingHint(Drawable.BUFFERED_IMAGE, new WeakReference<>(img));

                            graphics.scale(scale, scale);

                            // draw stuff
                            slide.draw(graphics);

                            ImageIO.write(img, "PNG", new File("output.png"));
                            graphics.dispose();
                            img.flush();
                        }
                    }
                ]]></source>
            </section>
        </section>
    </body>
</document>