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 FontsManager.FontFallBackRulesCollection property.
  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.
import aspose.slides as slides

# Create new instance of a rules collection
rulesList = slides.FontFallBackRulesCollection()

# create a number of rules
rulesList.add(slides.FontFallBackRule(0x400, 0x4FF, "Times New Roman"))

for fallBackRule in rulesList:
	#Trying to remove FallBack font "Tahoma" from loaded rules
	fallBackRule.remove("Tahoma")

	#And to update of rules for specified range
	if fallBackRule.range_end_index >= 0x4000 and fallBackRule.range_start_index < 0x5000:
		fallBackRule.add_fall_back_fonts("Verdana")

#Also we can remove any existing rules from list
if len(rulesList) > 0:
	rulesList.remove(rulesList[0])

with slides.Presentation(path + "input.pptx") as pres:
	#Assigning a prepared rules list for using
	pres.fonts_manager.font_fall_back_rules_collection = rulesList

	# Rendering of thumbnail with using of initialized rules collection and saving to PNG
	with pres.slides[0].get_image(1, 1) as img:
		img.save("Slide_0.png", slides.ImageFormat.PNG)
Create Fallback Fonts Collection