Browse Prior Art Database

Independent Pixel Interpretation for Windowed Overlays/Underlays

IP.com Disclosure Number: IPCOM000116469D
Original Publication Date: 1995-Sep-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 107K

Publishing Venue

IBM

Related People

Authors:
Grupp, R Vepstas, L Voltin, JA West, M [+details]

Abstract

This article describes a way in which internal RAMDAC hardware is added that makes it possible for overlay/underlay graphics memory to have separate pixel interpretations in independent windows of arbitrary shape relative to the frame buffer. This capability also makes it possible to vary the visibility priorities relative to frame buffer, transparent overlay, opaque overlay, and underlay pixels.