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Method and apparatus for display image rotation

  • US RE38,471 E1
  • Filed: 12/29/2000
  • Issued: 03/23/2004
  • Est. Priority Date: 09/27/1996
  • Status: Expired due to Term
First Claim
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1. A computer display system including a processor and a display system, the display system having a memory, said display system comprising:

  • a display means for displaying image information to be arranged in a plurality of horizontal lines of pixel data;

    a frame buffer containing the for storing pixel data of an image information, the frame buffer being stored in the memory in a manner that data of each of the plurality of horizontal lines including pixel data for the display means being stored in the memory resulting in the frame buffer occupying in a contiguous block in the a memory, and , the frame buffer further being accessible by the a processor using a processor address set of row and column addresses;

    a controller means for establishingfor determining new row addresses of a controller address set as the column addresses of the processor address set, and establishing new column address of the controller address set as the row addresses of the processor address set;

    the controller means being coupled to the display means for transferring adapted to transfer the pixel data of the frame buffer to the a display means using the new controller address set, the controller means setting each of the new row addresses of the controller address set as the difference between its current value and a maximum value of the new row addresses of the controller address set and providing the pixel data of the frame buffer to the display means while referencing both the new row addresses and the new column addresses of the controller address set in an ascending order.

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