Method and apparatus for writing directly to a frame buffer

Details Method and apparatus for writing directly to a frame buffer Method and apparatus for writing directly to a frame buffer

1990-12-21

1995-02-07

Powell, Mark R.

395164, G06F 1562

Patent

active

053882008

ABSTRACT:
A method is provided for writing directly to a frame buffer which provides signals to an output display of a computer system. The computer system has a first processor running a window management program controlling the furnishing of data in a first format to the frame buffer, and a second processor running application programs in a second format for display. A signal is provided from the second processor to the window management program indicating that an application program running on the second processor has information to be displayed. Then a window is set up for the display of the application program running on the second processor under control of the window management program. The second processor is signaled that the window exists and provided information regarding the position and clipping of the window. A data structure is set up for the window including a frame buffer address and clipping information for each address to be generated for displaying the application program running on the second processor in the window constructed. Data is transferred from the application program running on the second processor to the addresses in the frame buffer pointed to by the addresses in the data structure.

REFERENCES:
patent: 5119494 (1992-06-01), Garman
"Use of a Coprocessor for Emulating the PC AT", John W. Irwin, IBM RT Personal Computer Technology, pp. 137-141, 1986.
"Coprocessor Software Support", Rajan Krishnamurty and Terry Mothersole, IBM RT Personal Computer Technology, pp. 142-146, 1986.

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