Method and apparatus for transferring video data using mask data

Details Method and apparatus for transferring video data using mask data Method and apparatus for transferring video data using mask data

1997-10-29

1999-03-09

Jankus, Almis R.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06T 1100

Patent

active

058807411

ABSTRACT:
A mask data RAM (Random Access Memory) 213 stores mask data TDATA, which is 1 bit dot data representing a moving picture area MR. The state of the mask data TDATA determines the level of a write signal /MWR given to a dual-port VRAM (Video Random Access Memory) 212 for storing video data. An address for DMA (Direct Memory Access) transfer of the video data to the dual-port VRAM 212 is given to the mask data RAM 213 as well as the dual-port VRAM 212, and therefore the mask data TDATA are read out from the mask data RAM 213 for each dot of the video data. The mask data TDATA are updated according to the position and the shape of a moving picture window on a display screen. This allows a moving picture of an arbitrary shape corresponding to the state of the moving picture window to be transferred to the dual-port VRAM 212 and displayed on the display device.

REFERENCES:
patent: 5500933 (1996-03-01), Schnorf
patent: 5553210 (1996-09-01), Narayanaswami

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