Render Presentations with Fallback Fonts in PHP

Overview

Aspose.Slides allows you to render presentations using fallback font rules. This article shows how to create a fallback font rules collection, modify its rules by removing or adding fallback fonts, and assign the collection to the FontsManager::setFontFallBackRulesCollection method.

Once the fallback font rules collection is assigned to the presentation’s FontsManager, the rules are applied during operations such as saving, rendering, and converting the presentation. The example demonstrates how to use the configured rules when rendering a slide thumbnail and saving it as a PNG image.

Render a Slide Using Fallback Font Rules

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
  $rulesList = new FontFallBackRulesCollection();
  # create a number of rules
  $rulesList->add(new FontFallBackRule(0x400, 0x4ff, "Times New Roman"));
  foreach($rulesList as $fallBackRule) {
    # Trying to remove FallBack font "Tahoma" from loaded rules
    $fallBackRule->remove("Tahoma");
    # And to update of rules for specified range
    if (java_values($fallBackRule->getRangeEndIndex()) >= 0x4000 && java_values($fallBackRule->getRangeStartIndex()) < 0x5000) {
      $fallBackRule->addFallBackFonts("Verdana");
    }
  }
  # Also we can remove any existing rules from list
  if (java_values($rulesList->size()) > 0) {
    $rulesList->remove($rulesList->get_Item(0));
  }
  $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 JPEG
    $slideImage = $pres->getSlides()->get_Item(0)->getImage(1.0, 1.0);
    # Save the image to disk in JPEG format
    try {
      $slideImage->save("Slide_0.jpg", ImageFormat::Jpeg);
    } finally {
      if (!java_is_null($slideImage)) {
        $slideImage->dispose();
      }
    }
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

Read more about how to Convert PPT and PPTX to JPG in PHP.