Render Presentation with Fallback Font

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The following example includes these steps:

  1. We create fallback font rules collection.
  2. Remove a fallback font rule and addFallBackFonts to another rule.
  3. Set rules collection to getFontsManager.getFontFallBackRulesCollection method.
  4. With Presentation.save method we can save presentation in the same format, or save it in another one. After fallback font rules collection is set to FontsManager, these rules are applied during any operations over the presentation: save, render, convert, etc.
// Create new instance of a rules collection
IFontFallBackRulesCollection rulesList = new FontFallBackRulesCollection();

// create a number of rules
rulesList.add(new FontFallBackRule(0x400, 0x4FF, "Times New Roman"));

for (IFontFallBackRule fallBackRule : rulesList)
{
    //Trying to remove FallBack font "Tahoma" from loaded rules
    fallBackRule.remove("Tahoma");

    //And to update of rules for specified range
    if ((fallBackRule.getRangeEndIndex() >= 0x4000) && (fallBackRule.getRangeStartIndex() < 0x5000))
        fallBackRule.addFallBackFonts("Verdana");
}

//Also we can remove any existing rules from list
if (rulesList.size() > 0)
    rulesList.remove(rulesList.get_Item(0));

Presentation pres = new Presentation("input.pptx");
try {
    //Assigning a prepared rules list for using
    pres.getFontsManager().setFontFallBackRulesCollection(rulesList);

    // Rendering of thumbnail with using of initialized rules collection and saving to PNG
    ImageIO.write(pres.getSlides().get_Item(0).getThumbnail(1f, 1f), 
            "PNG", new File("Slide_0.png"));
} catch (IOException e) {
} finally {
    if (pres != null) pres.dispose();
}
Create Fallback Fonts Collection