Custom PowerPoint Font in Python

Load Custom Fonts

Aspose.Slides allows you to load fonts that are rendered in presentations without having to install those fonts. The fonts are loaded from a custom directory.

  1. Create an instance of the FontsLoader class and call the load_external_fonts method.
  2. Load the presentation that will be rendered.
  3. Clear the cache in the FontsLoader class.

This Python code demonstrates the font loading process:

import aspose.slides as slides

# The path to the documents directory.
dataDir = "C:\\"

# folders to seek fonts
folders = [ dataDir ]

# Loads the custom font directory fonts
slides.FontsLoader.load_external_fonts(folders)

# Do some work and perform presentation/slide rendering
with slides.Presentation(path + "DefaultFonts.pptx") as presentation:
    presentation.save("NewFonts_out.pptx", slides.export.SaveFormat.PPTX)

# Clears the font Cachce
slides.FontsLoader.clear_cache()

Get Custom Fonts Folder

Aspose.Slides provides the get_font_folders() method to allow you to find font folders. This method returns folders added through the LoadExternalFonts method and system font folders.

This Python code shows you how to use get_font_folders():

#  This line outputs the folders that are checked for font files.
# Those are folders added through the load_external_fonts method and system font folders.
fontFolders = slides.FontsLoader.get_font_folders()

Specify Custom Fonts Used With Presentation

Aspose.Slides provides the document_level_font_sources property to allow you to specify external fonts that will be used with the presentation.

This Python code shows you how to use the document_level_font_sources property:

import aspose.slides as slides

with open(path + "CustomFont1.ttf", "br") as font1:
    memoryFont1 = font1.read()
    with open(path + "CustomFont2.ttf", "br") as font2:
        memoryFont2 = font2.read()

        loadOptions = slides.LoadOptions()
        loadOptions.document_level_font_sources.font_folders =  ["assets\\fonts", "global\\fonts"] 
        loadOptions.document_level_font_sources.memory_fonts = [ memoryFont1, memoryFont2 ]
        with slides.Presentation(path + "DefaultFonts.pptx", loadOptions) as presentation:
            # Work with the presentation
            # CustomFont1, CustomFont2, and fonts from assets\fonts & global\fonts folders and their subfolders are available to the presentation
            print(len(presentation.slides))

Manage Fonts Externally

Aspose.Slides provides the load_external_font(data) method to allow you to load external fonts from binary data.

This Python code demonstrates the byte array font loading process:

from aspose.slides import FontsLoader, Presentation

def read_all_bytes(path):
    with open(path, "rb") as in_file:
        bytes = in_file.read()
    return bytes

FontsLoader.load_external_font(read_all_bytes("ARIALN.TTF"))
FontsLoader.load_external_font(read_all_bytes("ARIALNBI.TTF"))
FontsLoader.load_external_font(read_all_bytes("ARIALNI.TTF"))

try:
    with Presentation() as pres:
        # external font loaded during the presentation lifetime
        print("processing")
finally:
    FontsLoader.clear_cache()
Default Font