Browse Prior Art Database

Compression/Decompression of Font Patterns

IP.com Disclosure Number: IPCOM000059736D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08

Publishing Venue

IBM

Related People

Authors:
Ishii, N Matsubara, S [+details]

Abstract

This article describes the generation or decompression of font patterns from the compressed form data including control bytes and data bytes. An 8 x 16 dot matrix, as shown in Figs. 1 and 2, is assigned for each character. Referring to Fig. 1, the first 8 x 8 dot matrix in the 8 x 16 character font pattern is generated from a control byte (a) and data bytes (b) - (f), and the second 8 x 8 dot matrix is generated from a control byte (g) and data bytes (h) - (k). The control bytes (a) and (g) indicate vertical arrangement of the sixteen 8-dot horizontal slices or blocks. The "0" bit in the control byte indicates that an 8-dot horizontal slice includes all "0" bits, and the "1" bit in the control byte indicates that a data byte following the control byte will be mapped as an 8-dot horizontal slice.