Font Data Streaming

摘要

Provided is a method for font data streaming for time-based video/audio presentations where content is transmitted in small increments and transmission continues while a previously transmitted portion is viewed or played. Different subsets of characters of the same font are assembled together on a device and previously sent characters are reused for rendering subsequent text strings. Font subsets are created to provide only a minimal number of glyphs for the character set coverage, thereby reducing the redundancy of font data transmission and reducing the total number of characters transmitted.

主权项

1. A method of font data streaming in relation to font data transmissions, the method comprising steps as follows:
subdividing a media stream into data segments, the media stream including character data and font data; analyzing text content of a data segment to determine any required fonts and an initial character set coverage for that data segment; for each required font, generating and storing into memory a font subset that comprises only glyphs necessary for the initial character set coverage; and transmitting the font subset along with the respective data segment to a receiving device; wherein said steps reduce redundancy in font data transmissions through reducing total number of characters for data transmitted during any given transmission to said receiving device.