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Scaling processor for raster images

  • US 5,363,119 A
  • Filed: 01/15/1993
  • Issued: 11/08/1994
  • Est. Priority Date: 05/01/1991
  • Status: Expired due to Term
First Claim
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1. A scaling processor, comprising:

  • a graphics memory storing a plurality of digital pictures, each of the digital pictures comprising a plurality of run length encoded (RLE) transition segments, each RLE transition segment, having a length and a color code, indicative of color pixels in at least a portion of a raster scan line;

    a parameter memory storing a plurality of motion object specifiers, each of the specifiers referring to a selected one of the digital pictures in the graphics memory and having a scale factor, and wherein a center of mass for the selected digital picture is predefined as an ordered set of offset Cartesian coordinates, (Xoffset, Yoffset), the Xoffset coordinate defined as the horizontal offset and the Yoffset defined as the vertical offset, the origin for the coordinates defined as a corner of the selected digital picture;

    a processor selecting one of the motion object specifiers in the parameter memory and selecting one of the RLE transition segments of the referenced digital picture in the graphics memory;

    a frame buffer; and

    a line fill state machine receiving the scale factor in the selected motion object specifier and receiving the selected RLE transition segment, wherein the length in the RLE transition segment is decremented while the color code in the RLE transition segment is written into the frame buffer at increasing addresses, the scale factor indicative of a growth or shrink operation thereby determinative of whether the decrementing of the length or the increasing of addresses isselectively disabled.

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