Method for smooth bitmap scrolling

Details Method for smooth bitmap scrolling Method for smooth bitmap scrolling

1989-06-16

1991-10-01

Brier, Jeffrey A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340724, 340799, G09G 534

Patent

active

050537610

ABSTRACT:
Smooth scrolling of a document on an all points addressable system which provides fast response and scrolling in increments of a single display row, while being storage efficient. The document is completely stored in compact format and a portion of the document which encompasses the current display window is stored in bitmap image format. There is smooth scrolling between displays completely within the bitmap image. The scroll is only interrupted for a scroll outside the portion of the document in bitmap image format, in which case the bitmap image is adjusted using the compact format to include that portion of the document with the desired display.

REFERENCES:
patent: 4412294 (1983-10-01), Watts et al.
patent: 4437093 (1984-03-01), Bradley
patent: 4611202 (1986-09-01), DiNitto et al.
patent: 4649379 (1987-03-01), Canton et al.
patent: 4663617 (1987-05-01), Stockwell
patent: 4706076 (1987-11-01), Racchini

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