Method and apparatus for creating and transferring a bitmap

Details Method and apparatus for creating and transferring a bitmap Method and apparatus for creating and transferring a bitmap

1994-10-24

1997-08-19

Liang, Regina D.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345189, G09G 500

Patent

active

056593368

ABSTRACT:
In response to a command to draw text on a screen, a computer's operating system creates a superglyph bitmap that combines text and a background color into a single bitmap. The bitmap is then transferred to screen memory by either a graphics driver or the operating system itself, depending upon whether the graphics driver has special characteristics for displaying the bitmap such as monochrome-to-color conversion. With this division of tasks, graphics drivers may be simplified to handle tasks for which they are uniquely qualified and the operating system handles more general tasks such a creating the bitmap. The concept may also be applied to other types of bitmaps, wherever it is advantageous to create bitmaps with the operating system and transfer bitmaps with either a graphics driver or the operating system.

REFERENCES:
patent: 5224210 (1993-06-01), Pinedo et al.
patent: 5381347 (1995-01-01), Gery
"Device Driver Adaption Guide" Microsoft Corporation, 1992; Chapter 1, 2 & 10.

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