Large character set handling in limited devices

• US 20070024626A1
• Filed: 07/29/2005
• Published: 02/01/2007
• Est. Priority Date: 07/29/2005
• Status: Abandoned Application

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Lin, Jeffrey, Kagle, Jonathan
• Application Number:
  US11/193,029
• Publication Number:
  US 20070024626A1
• Time in Patent Office: Days
• US Class Current: 345/467
• CPC Class Codes: G06F 40/109 Font handling; Temporal or kinetic typography
• CPC Class Codes: G06F 40/129 Handling non-Latin characters, e.g. kana-to-kanji conversion
• CPC Class Codes: G06T 11/203 Drawing of straight lines or curves

Abstract

Limited devices have memories that are typically too small to store a complete font having an extended character set. The ability to handle necessary characters can be provided by leveraging connectivity of a limited device to a PC or server without requiring significant bandwidth or substantially reducing performance of the limited device. The limited device stores portions a font (typically on a character-by-character basis) and downloads information from the server as needed to display characters for which the limited device does not have sufficient information.

Claims

1. A computer-implemented method for displaying characters, the method comprising:

storing a portion of a font in a local memory of a device such that information for displaying a limited number of characters can be accessed, wherein the limited number of characters is less than the total number of characters in the font;

receiving from a server display information for displaying a missing character for which information for displaying the missing character has not been stored;

caching the received display information in a cache of the device; and

displaying the missing character in accordance with the cached and received display information.

2. The method of claim 1 wherein the received information is received in response to a synchronization of data between the device and the server.

3. The method of claim 1 wherein the received information is received in response to a selection of a particular application to be executed on the device.

4. The method of claim 1 wherein the received information is received in response to a request from a particular application executing on the device.

5. The method of claim 1 further comprising displaying a placeholder character for the missing character until information for displaying the missing character is received.

6. The method of claim 5 further comprising replacing the placeholder character character without replacing other characters that are not placeholder characters.

7. The method of claim 1 wherein the received information is received in response to a connection between the device and the server.

8. The method of claim 1 wherein information for displaying a range of missing characters is received for which information for displaying the range of missing characters has not been stored.

9. The method of claim 1 wherein the font comprises characters for ideographs.

10. A computer-implemented system for font management, the system comprising:

a font renderer that is configured to render characters to a display;

a local memory that is configured to store information for rendering characters of a selected font;

a font request manager that is configured to determine whether the local memory contains information for rendering a character of the selected font; and

a font downloader that is configured to in response to a determination by the font request manager that the local memory does not contain for rendering a character of the selected font, download from a server and cause to be stored in the local memory the information for rendering the character of the selected font.

11. The system of claim 10 further comprising a sync client that is configured to instruct the font downloader to download and store in the local memory the information for rendering the character of the selected font in response to synchronization of data between the device and the server.

12. The system of claim 10 further comprising an application that instructs the font renderer to display a character of the selected font.

13. The system of claim 10 wherein the local memory comprises a cache that is configured to store downloaded information for displaying characters of the selected font, and to maintain the information in the cache in accordance with a predetermined cache policy.

14. The system of claim 10 wherein the local memory contains information for displaying character in the selected font, wherein the information is not sufficient to display every character of the selected font.

15. The system of claim 10 wherein the selected font comprises Chinese characters.

16. A computer-implemented system for font management, the system comprising:

means for storing substantially all information required for displaying any requested character of a selected font;

means for receiving a request for information required to display a requested character of the selected font, wherein the request is made via a connected device; and

means for uploading the requested information to the connected device.

17. The system of claim 16 further comprising means for synchronizing of data between the connected device and the system, wherein the synchronization causes request for information required to display a requested character of the selected font to be made.

18. The system of claim 17 wherein the data synchronized by the synchronization means comprises email.

19. The system of claim 16 wherein the selected font comprises Japanese characters.