Method and apparatus for stretching bitmaps to non-integer multi

Details Method and apparatus for stretching bitmaps to non-integer multi Method and apparatus for stretching bitmaps to non-integer multi

1996-05-14

1999-03-23

Saras, Steven

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345509, 382298, G09G 500

Patent

active

058866825

ABSTRACT:
The stretching of bitmap images in a computer system is accomplished by stretching each row of a source bitmap and storing the pixel information associated with the stretched row in a buffer, typically in main memory. The pixel information is transferred multiple times to the memory location associated with the destination bitmap, these memory locations generally reside in either main memory or in the frame buffer. Each time the buffer is written to the destination bitmap, an error term is adjusted by a predetermined amount. When the value of the error term meets a predefined criteria, the next row of the source bitmap is stretched and stored in the buffer and the process is repeated.

REFERENCES:
patent: 4631751 (1986-12-01), Anderson et al.
patent: 4742553 (1988-05-01), Irwin
patent: 4821031 (1989-04-01), Roberts
patent: 4875173 (1989-10-01), Nakajima
patent: 5113455 (1992-05-01), Scott
patent: 5335296 (1994-08-01), Larkin et al.

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