US 7,064,758 B2 · System and method of caching glyphs for display by a remote terminal

Abstract

A method and system of operating a remote terminal by a terminal server caches representation data of glyphs to be displayed on the remote terminal to reduce the amount of glyph data that have to be transmitted to the remote terminal through a network connection. The glyph caching is performed on a level of text fragments each of which includes a plurality of glyphs. The remote terminal stores a fragment cache for caching fragments and glyph caches for caching individual glyphs. Each entry in the fragment cache contains data indicating where the glyph data for the glyphs of the fragment are stored in the glyph caches. When the terminal server receives a request to display a text fragment on the remote terminal, it checks whether that fragment is cached at the remote terminal. If so, the terminal server sends a fragment index to the client identifying the entry in the fragment cache for that fragment. The terminal client retrieves the information in the fragment cache entry and then retrieves the glyph data for the glyphs of the fragment from the glyph cache, and displays them on the remote terminal.

Claims11

Dependent claims

A computer-readable medium having computer-executable instructions for performing steps to communicate with a remote terminal for displaying graphic user interface images, comprising:

receiving a drawing request to display a fragment on the remote terminal, the fragment including a plurality of glyphs;
determining whether the fragment has been cached in a fragment cache at the remote terminal;
sending a fragment index associated with the fragment to the remote terminal, when it is determined that the fragment has been cached, the fragment index identifying an entry in the fragment cache that stores data representing the fragment;
and
when it is determined that the fragment has not been cached:
identifying missing glyphs of the fragment that have not been cached at the remote terminal;
caching the missing glyphs at the remote terminal;
determining a fragment index for the fragment, the fragment index identifying an entry in the fragment table for storing said fragment;
and
storing the fragment index on a local computer system for maintaining the fragment cache on the remote terminal.

7 more elements

Dependencies are inferred from the claim text.

System and method of caching glyphs for display by a remote terminal

Life of this patent

System and method of caching glyphs for display by a remote terminal

Life of this patent

Abstract

Claims11