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Method for displaying bitmap derived text at a display having limited pixel-to-pixel spacing resolution

  • US 5,910,805 A
  • Filed: 01/11/1996
  • Issued: 06/08/1999
  • Est. Priority Date: 01/11/1996
  • Status: Expired due to Fees
First Claim
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1. A method for generating typeset characterized text, at a platform display exhibiting limited display pixel-to-display pixel spacing resolution, said text having a predetermined font of characters of select character pixel defined font type and font size, and said text being conveyed from a server to client software at said platform, comprising the steps of:

  • I. providing an image font file as a compressed bit map representation of each of said characters of said font, derived as a compressed character image template corresponding with a font size representing an expansion factor, F, based scaling of said predetermined font select size;

    II. providing a device independent typesetting specification file for said text and said predetermined font of characters such typesetting specification representing the ideal location of each character of said text at a display;

    III. conveying said image font file and said typesetting specification file to said client software; and

    IV. at said platform;

    (a) determining any positional error from said typesetting specification file and said display pixel-to-display pixel spacing resolution said positional error being derived with respect to said ideal location for each character of said text when located at the nearest display pixel available at said display,(b) determining for a text character whether said error is greater than a predetermined portion of said pixel-to-pixel spacing,(c) accessing said image font file for said compressed character image template corresponding with said text character,(d) shifting said compressed character image template in a predetermined direction an amount representing at least one character image template pixel when said determination (b) is that said error is greater than said predetermined portion of said spacing,(e) filtering and scaling said compressed character image template to derive an anti-aliased display character of said select font size,(f) displaying said display character at said platform display, and(g) reiterating steps (a) through (f) for characters of said text.

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