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Compressing Height Tables for Selected Printable Symbols

IP.com Disclosure Number: IPCOM000063724D
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Bartlett, G Boulia, D Pring, E [+details]

Abstract

In many applications, it is desired to have a unique set of characters and fonts such as for printing mathematical expressions and sets of diagrammatic symbols. Truncation of height-value-containing tables reduces data storage requirements without sacrificing aesthetic values. Each font contains at most 256 characters, and each character has (potentially unique) ascender and descender values. Usually, each 15-bit ascender and descender value (two values per character) is stored in the font library along with the character representation, either vector notation or as a raster pattern. A typical document may require several dozen fonts to be stored in virtual storage. Such storage is less available then library (DASD) storage, so it is advantageous to minimize storage requirements.