Method and system for improved glyph cache efficiency

摘要

A method, system and computer program product encoded on a computer-readable medium for obtaining a glyph rendering are described. A request is received for a rendered first glyph for display on a display device. The request includes rendering information including a first origin. Each device pixel of the display device includes n sub-pixels, where n is an integer greater than 1. A rendered second glyph matching the first glyph is found in a cache of rendered glyphs. A matching rendered second glyph includes a rendered glyph having a second origin offset from the first origin by x/n of a device pixel, where x is an integer ranging between 1 and (n−1). If the second origin is offset from the first origin by x/n, then the density values associated with each sub-pixel of the matching rendered second glyph are shifted by x/n of a device pixel.

主权项

1. A computer implemented method comprising:
receiving a request for a rendered first glyph for display on a display device, where the request includes rendering information that includes a first origin and each device pixel of the display device comprises n sub-pixels, where n is an integer greater than 1; finding in a cache of rendered glyphs a rendered second glyph matching the first glyph, where a matching rendered second glyph includes a rendered glyph having a second origin offset from the first origin by x/n of a device pixel, where x is an integer ranging between 1 and (n−1); and shifting density values associated with each sub-pixel of the matching rendered second glyph by x/n of a device pixel if the matching rendered second glyph has a second origin offset from the first origin by x/n.