Font Substitution - PowerPoint Java API

Aspose.Slides allows you to set rules for fonts that determines what must be done in certain conditions (for example, when a font cannot be accessed) this way:

1. Load the relevant presentation.
2. Load the font that will be replaced.
3. Load the new font.
4. Add a rule for the replacement.
5. Add the rule to the presentation font replacement rule collection.
6. Generate the slide image to observe the effect.

This Java code demonstrates the font substitution process:

// Loads a presentation
Presentation pres = new Presentation("Fonts.pptx");
try {
    // Loads the source font that will be replaced
    IFontData sourceFont = new FontData("SomeRareFont");
    
    // Loads the new font
    IFontData destFont = new FontData("Arial");
    
    // Adds a font rule for font replacement
    IFontSubstRule fontSubstRule = new FontSubstRule(sourceFont, destFont, FontSubstCondition.WhenInaccessible);
    
    // Adds the rule to font substitute rules collection
    IFontSubstRuleCollection fontSubstRuleCollection = new FontSubstRuleCollection();
    fontSubstRuleCollection.add(fontSubstRule);
    
    // Adds a font rule collection to the rule list
    pres.getFontsManager().setFontSubstRuleList(fontSubstRuleCollection);
    
    // Arial font will be used in place of SomeRareFont when the latter is inaccessible
    IImage slideImage = pres.getSlides().get_Item(0).getImage(1f, 1f);
    
    // Saves the image to disk in the JPEG format
    try {
          slideImage.save("Thumbnail_out.jpg", ImageFormat.Jpeg);
    } finally {
         if (slideImage != null) slideImage.dispose();
    }
} finally {
    if (pres != null) pres.dispose();
}

NOTE

You may want to see Font Replacement.