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Method and system for displaying images on a display device using an offscreen video memory

  • US 5,381,347 A
  • Filed: 12/21/1992
  • Issued: 01/10/1995
  • Est. Priority Date: 12/21/1992
  • Status: Expired due to Term
First Claim
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1. A method executed in a computer system for displaying images on a display device, the computer system including a central processor, a system memory, and a system bus, the method comprising the steps of:

  • providing an adapter allowing the computer to communicate with the display device, the adapter including an offscreen video memory and an onscreen video memory separate from the system memory, and a dedicated video processor separate from the central processor, and an adapter bus separate from the system bus;

    sending a create bitmap command to the central processor for creating a bitmap directly in the offscreen video memory without creating the bitmap in the system memory;

    executing the create bitmap command in the central processor to create the bitmap directly in the offscreen video memory without creating the bitmap in the system memory;

    sending a copy bitmap command to the dedicated video processor for copying the bitmap directly from the offscreen video memory to the onscreen video memory;

    executing the copy bitmap command in the dedicated video processor to copy the bitmap directly from the offscreen video memory to the onscreen video memory over the adapter bus, without first copying the bitmap to the system memory; and

    displaying the bitmap in the onscreen video memory on the display device.

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