×

Display controller with enhanced video window clipping

  • US 5,768,491 A
  • Filed: 06/07/1995
  • Issued: 06/16/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A display controller having capability to display a predefined region of video on a computer display, comprising:

  • a first memory portion in a frame buffer memory for storing information for display;

    a second memory portion in a frame buffer memory for storing at least one group of transition information defining points of said predefined video region at which screen objects overlay said predefined video region, and wherein said group of transition information includes a first transition word for specifying a scanline at which the transition information in said group of transition information is no longer valid; and

    video control circuitry for reading said transition information from said second memory portion and enabling or disabling writing of video information to said first memory portion responsive thereto.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×