Logical drawing and transparency circuits for bit mapped video d

Details Logical drawing and transparency circuits for bit mapped video d Logical drawing and transparency circuits for bit mapped video d

1987-11-16

1990-01-09

Moore, David K.

Communications: electrical

Land vehicle alarms or indicators

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

364521, G09G 114

Patent

active

048931160

ABSTRACT:
An interface controller, situated between a graphics controller and a memory array in a color video display system operable in a read-modify-write mode, configured to detect a select transparency color in whole or in part and to respond by selectively changing the color binary data for the corresponding pixel in a frame buffer. In another aspect, the invention includes drawing modes impelmented by logically combining pixel color binary data in accordance with a defined truth table so as to allow the pixel color data representing a new image to interact in a defined manner based upon color with the data in a previously defined image. As implemented, the binary data in the frame buffer is acted upon in a read-modify-write sequence whereby the various logic operations analyze the source (foreground) pixel data, the destination (background) pixel data, in the context of control signals, to define the pixel color data written into the frame buffer as the color representation for that pixel position.

REFERENCES:
patent: 4682297 (1987-07-01), Iwami
patent: 4700181 (1987-10-01), Maine et al.
patent: 4752893 (1988-06-01), Guttag et al.
"NCR 7300/7301 Color Graphics Chip Set Preliminary Data Sheet", NCR Microelectronics Division, Colorado Springs, Revision May 1, 1986.
"NCR Color Graphics Controller", NCR 7300, NCR Microelectronics Division.

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