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Method and apparatus using a two-dimensional circular data buffer for scrollable image display

  • US 20050001848A1
  • Filed: 08/02/2004
  • Published: 01/06/2005
  • Est. Priority Date: 08/01/2001
  • Status: Active Grant
First Claim
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1. A method of calculating a pixel address within a two dimensional data buffer, wherein the pixel is characterized by a linear segment position and a linear segment number in the data buffer, and wherein the two dimensional data buffer is characterized by a linear segment length and a buffer size, the method comprising calculating a linear segment offset within a two dimensional data buffer by multiplying a linear segment number by a linear segment length calculating a raw address by adding a two dimensional display buffer starting data address modulo the data buffer size, a pixel linear segment position and the linear segment offset;

  • and in response to the raw address having a magnitude greater than the data buffer size, then reducing the magnitude of raw address by the buffer size.

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