Display Architecture to Allow Rapid Updating of a Bit-Mapped Display With Automatic Regeneration of Affected Elements
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
In a raster display system the erasure of one image which is superimposed on another image will inadvertently erase any points held in common by the two images. This invention describes the means of driving a raster display from a display list, avoiding both this problem of erasure and the time delay in introducing new elements to the display list. The most important aspect of this technique is that modifications to the display are rapidly generated so that immediate feedback may be given to the user. The integrity of the display is subsequently preserved with a "healing" process. Raster displays normally use a bit buffer for regeneration of the image displayed. The techniques for translating display elements, such as vectors and characters, to a bit buffer are well known and are not discussed here.