Working with TrueType Fonts

Working with TrueType Fonts

TrueType (TTF) fonts are the most common desktop and web font format. Aspose.Font FOSS for Python exposes TtfFont for accessing TTF-specific table data, glyph blob retrieval, and variable font axis control.

Loading a TTF Font

FontLoader.open() auto-detects TTF format and returns a TtfFont-typed object.

from aspose_font.loader import FontLoader

font = FontLoader.open("Roboto-Regular.ttf")
print(font.font_name, font.num_glyphs, "glyphs")

Accessing TTF Tables

TtfFont.ttf_tables exposes a TtfTableSet with named properties for common tables.

from aspose_font.loader import FontLoader
from aspose_font.ttf.font import TtfFont

ttf_font: TtfFont = FontLoader.open("Roboto-Regular.ttf")
tables = ttf_font.ttf_tables
print("kern table present:", tables.kern is not None)

Raw Table Bytes

Use TtfFont.get_table_bytes(tag) to retrieve raw binary table data and TtfFont.set_table_bytes(tag, data) to write modified table bytes.

from aspose_font.loader import FontLoader
from aspose_font.ttf.font import TtfFont

ttf_font: TtfFont = FontLoader.open("Roboto-Regular.ttf")
raw_cmap = ttf_font.get_table_bytes("cmap")

Variable Font Instances

TtfFont.get_axis() returns axis information. TtfInstancer.instantiate() produces a static instance from a variable font at specified axis coordinates.

from aspose_font.loader import FontLoader
from aspose_font.ttf.font import TtfFont
from aspose_font.ttf.instancer import TtfInstancer

ttf_font: TtfFont = FontLoader.open("Roboto-VariableFont_wdth,wght.ttf")
# Get a static instance at wght=700, wdth=75
instance = TtfInstancer.instantiate(ttf_font, {"wght": 700.0, "wdth": 75.0})

Tips and Best Practices

• Always use isinstance(font, TtfFont) before accessing ttf_tables or get_table_bytes()
• Use TtfTableSet.kern to check kerning availability before reading kern pairs
• Variable font instancing produces a new font object; the original is unchanged

API Reference Summary