Method for updating a display bitmap with a character string or

Details Method for updating a display bitmap with a character string or Method for updating a display bitmap with a character string or

1988-09-13

1991-06-04

Shaw, Dale M.

Boots, shoes, and leggings

364521, 340750, 340799, 340735, G06F 1562, G09G 536

Patent

active

050219740

ABSTRACT:
An improved method and system for updating a display bitmap with a character string in a given font is provided. Each character in the font is stored as a character bitmap. Each character comprises a contiguous set of virtual characters. A visible stack is created for each character string to be displayed in the display bitmap. For each character to be displayed, the visible stack contains a pointer to each of its virtual characters. The data in the visible stack is then processed to update efficiently the display bitmap. The display bitmap is updated column by column, each column being one byte side. For each byte in the column, the virtual characters that are to be displayed in that byte are combined to form an output byte that is output to the display bitmap. The combining is accomplished by special-purpose routines based on the number of virtual characters that are to be displayed in a particular column.

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patent: 4864518 (1989-09-01), Kurita
patent: 4910505 (1990-03-01), Beaven et al.
patent: 4953102 (1990-08-01), Kimura et al.

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