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Drawing Dynamic Segments in Graphics Display

IP.com Disclosure Number: IPCOM000064297D
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Murphy, AS [+details]

Abstract

In graphics display, problems occur when dynamic segments are drawn on top of other non-dynamic segments. Two techniques using a shadow buffer to store part of the image plane are disclosed to avoid the problems. A bit comparison method replaces pels from the shadow buffer containing dynamic segments in the image plane and a masking method in which the mask represents parts of the image not occupied by a non-dynamic segment and pels are transferred from the shadow buffer to the image plane. Drawing dynamic segments by conventional methods suffers from two problems: A. The dynamic segments must be drawn "on top of" the non-dynamic ones. This imposes a constraint upon the application software. B.