Browse Prior Art Database

Rasterizer which Caches Part Glyph Data

IP.com Disclosure Number: IPCOM000119193D
Original Publication Date: 1996-Mar-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Kawaguchi, Y: AUTHOR [+2]

Abstract

Disclosed is a rasterizer for TrueType* font which caches part glyph data for composite glyphs. Since composite glyphs consists of some part glyphs, to cache the part glyph data improves the execution performance of the rasterizer.

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Rasterizer which Caches Part Glyph Data

      Disclosed is a rasterizer for TrueType* font which caches part
glyph data for composite glyphs.  Since composite glyphs consists of
some part glyphs, to cache the part glyph data improves the execution
performance of the rasterizer.

      The Figure shows the flow to rasterize a composite glyph.  A
composite glyph consists of some part glyphs.  At first, the
rasterizer does scaling and grid-fitting each part glyph.  Then, all
the part glyph  data is combined, and scan-conversion is done to
generate a bitmap image.  The data of part glyphs are cached even
after finishing to handle  the composite glyph.  When another
composite glyph needs the same part glyph, the already
scaled/grid-fitted data is used instead of scaling/grid-fitting
again.

      The rasterizer which caches part glyph data is useful for all
systems which need to display TrueType fonts, including computers and
printers.
  *  Trademark of Microsoft Corporation.