The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 1990
Filed:
Apr. 18, 1986
Adrian Sfarti, Sunnyvale, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
The picking method and apparatus comprise: A CPU and a direct memory access (DMA) circuit which is used with a graphics microprocessor (G.mu.P) for virtually redrawing a display list from a system memory of objects in a bit map. A starting address and a number corresponding to the number of instructions in a segment comprising a plurality of display lists are sent to the DMA for this purpose. When the coordinates of a pointer match the coordinates of a selected data object, a pick interrupt signal and special pick instruction is sent to the CPU. The CPU then uses the starting address of the display list of a selected object from a table to generate a new display list to perform a pre-selected operation on the selected data object. The clipping method and apparatus comprise a plurality of data planes for storing data objects, a match plane for storing a clipping object and a one-bit register. In use, the pixels in the data and match planes are scanned. When a match occurs between a pixel in the match plane and the contents of the one-bit register, a match signal is generated. The match signal enables the data planes to re-store the corresponding pixels of the data objects in the match planes.