A scalable font is a type font that can be resized
(enlarged or reduced) without introducing distortion. The outline of each
character is stored as a mathematical formula. The set of all such formulas
for a complete set of characters is called an outline font. The outline
font remains essentially the same regardless of the size of the characters.
This eliminates the necessity for storing a gigantic set of characters
to encompass all the possible sizes for a particular font.
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