Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-17
Barker, JH: AUTHOR [+2]
AbstractDescribed is a technique which provides a "see through" window capability on a personal computer system graphics display.
a technique which provides a "see through" window
capability on a personal computer system graphics display.
applications, it is desirable to open a smaller
window on the currently active display area to show some additional
text or graphics. Current implementations overlay the current screen
content with new data and block the view of some or all of the
original content. The method disclosed herein can be used to retain
a usable portion of the original image by overlaying a translucent
window and then drawing in that window with translucent text and
graphics. This can provide significant user friendliness and an
application program that appears to be richer in function.
other techniques similar to the one of this
disclosure but the effect is not the same. One popular technique is
to use an Exclusive Or function to overlay the data. This causes
both the original and overlay data to be distorted. Another
technique is to use an Or function. Again, this will cause
distortion. A further method is to overlay the existing data with
the window data. This has the disadvantage of completely covering
some areas of the original data if the overlay is fairly dense. By
using a mask to And with the original data, an inverted mask to And
with the overlay and then Or the two results together retains a
usable copy of both the original and overlay.
The translucent window is accomp...