Browse Prior Art Database

Implementation of Blanks Without Use of the Font Storage Memory

IP.com Disclosure Number: IPCOM000039803D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hanna, SD: AUTHOR

Abstract

This article describes a baseline character generator that can be used to generate a raster image of a page from a memory that contains a coded and ordered representation of the page. More specifically, this article discloses a technique for minimizing font space usage for all blank areas (reduces pel storage requirements), such as blank characters, margin padding characters, etc. Providing blanks without the use of storage is obtained by allowing the use of characters which have zero valid height in the font (i.e., blanks). By allowing a character to have a specified valid character height, several other attractive characteristics are also obtainable. Characters which have a blank area on top (e.g.

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Implementation of Blanks Without Use of the Font Storage Memory

This article describes a baseline character generator that can be used to generate a raster image of a page from a memory that contains a coded and ordered representation of the page. More specifically, this article discloses a technique for minimizing font space usage for all blank areas (reduces pel storage requirements), such as blank characters, margin padding characters, etc. Providing blanks without the use of storage is obtained by allowing the use of characters which have zero valid height in the font (i.e., blanks). By allowing a character to have a specified valid character height, several other attractive characteristics are also obtainable. Characters which have a blank area on top (e.g., almost all lower case characters) can be stored in less memory space since the character generator hardware will force white above characters up to the line height when writing the character. Such a hardware design minimizes blank storage and therefore allows more font space for other character storage without adding more font memory. Hardware to implement this system is shown in the preceding article.

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