Character data processing method and apparatus

• US 5,721,812 A
• Filed: 03/26/1996
• Issued: 02/24/1998
• Est. Priority Date: 03/28/1995
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Mochizuki, Yasushi
• Primary Examiner(s): Treat, William M.
• Application Number:
  US08/621,979
• Time in Patent Office: 700 Days
• Field of Search: 395/110, 395/167-172, 395/898, 395/805, 345/192-195
• US Class Current: 358/1.11
• CPC Class Codes: G06F 3/1297 Printer code translation, conversion, emulation, compression; Configuration of printer parameters
• CPC Class Codes: G06K 15/00 Arrangements for producing a permanent visual presentation of the output data , e.g. computer output printersprinting or plotting combined with another operation, e.g. with conveying, G06K17/00
• CPC Class Codes: G06K 2215/0008 Downloading generic data

Abstract

A character-data processing method and apparatus enabling registration of font data generated by an external device into an output device even if the data format created by the external device is different from that of the output device. When font data generated by a host computer is sent to a printer, whether or not a 4-byte font identification flag of the font data is effective is judged. If effective, the font data is registered as an effective external character font. If not effective, the endian of the data is converted by rearranging the order of byte-array of the identification flag, and whether or not the font is effective is judged. If effective, the font data is registered while performing endian conversion by rearranging the order of byte-array of font data itself. Thus, difference of endians between the host computer and the printer is offsetted. Regarding bitmap font data, endian conversion is performed such that the MSB side bit and the LSB side bit are exchanged. Thus, in a case where the endians of the host computer and the printer are different, the font data generated by the host computer can be used by the printer.

Claims

1. A character-data processing method for registering font data into a device which treats data having a predetermined word length, comprising:

a judgment step of judging an endian corresponding to input font data;

an endian conversion step of converting structure of the font data based on the result from judgment at said judgment step, in accordance with a predetermined rule; and

a registration step of storing the font data converted at said endian conversion step.

2. The character-data processing method according to claim 1, wherein said judgment step includes:

a decision step of deciding whether or not identification data included in the font data has a predetermined value;

a conversion step of, if it is decided at said decision step that the identification data does not have the predetermined value, converting the identification data by exchanging an upper byte with a lower byte of each word of the identification data; and

a second decision step of deciding whether or not the identification data converted at said conversion step has the predetermined value,

wherein at said endian conversion step, conversion of the structure of the font data is performed if it is decided at said second decision step that the identification data converted at said conversion step has the predetermined value.

3. The character-data processing method according to claim 1, wherein said endian conversion step includes:

a conversion step of exchanging an upper byte with a lower byte of each word of the font data;

a decision step of deciding whether or not the font data is indicative of a bitmap font; and

a second conversion step of, if it is decided at said decision step that the font data is indicative of a bitmap font, exchanging an upper bit with a lower byte of each byte of the font data.

4. The character-data processing method according to claim 1, further comprising an adjustment step of adjusting the structure of the font data such that a part of data has a length multiple of a predetermined word length, prior to storing at said registration step.

5. The character-data processing method according to claim 3, wherein at said second conversion step, conversion is performed on character-pattern data included in the font data.

6. The character-data processing method according to claim 2, wherein if it is decided at said second decision step that the identification data converted at said conversion step does not have the predetermined value, the font data is not registered at said registration step.

7. The character-data processing method according to claim 2, if it is decided at said decision step that the identification data has the predetermined value, the font data is stored at said registration step without conversion at said endian conversion step.

8. A character-data processing apparatus for registering font data in unit of a predetermined word length, comprising:

judgment means for judging whether or not an endian of input font data corresponds with an endian of said character-data processing apparatus;

endian conversion means for converting structure of the font data based on the result from judgment by said judgment means, in accordance with a predetermined rule; and

registration means for storing the font data converted by said endian conversion means.

9. The character-data processing apparatus according to claim 8, wherein said judgment means includes:

decision means for deciding whether or not identification data included in the font data has a predetermined value;

conversion means for, if said decision means decides that the identification data does not have the predetermined value, converting the identification data by exchanging an upper byte with a lower byte of each word of the identification data; and

second decision means for deciding whether or not the identification data converted by said conversion means has the predetermined value,

wherein said endian conversion means converts the structure of the font data if said second decision means decides that the identification data converted by said conversion means has the predetermined value.

10. The character-data processing apparatus according to claim 8, wherein said endian conversion means includes:

conversion means for exchanging an upper byte with a lower byte of each word of the font data;

decision means for deciding whether or not the font data is indicative of a bitmap font; and

second conversion means for, if said decision means decides that the font data is indicative of a bitmap font, exchanging an upper bit with a lower bit of each byte of the font data.

11. The character-data processing apparatus according to claim 8, further comprising adjustment means for adjusting the structure of the font data such that a part of data has a length multiple of a predetermined word length, prior to storing by said registration means.

12. The character-data processing apparatus according to claim 10, wherein said second conversion means converts character-pattern data included in the font data.

13. The character-data processing apparatus according to claim 9, wherein if said second decision means decides that the identification data converted by said conversion means does not have the predetermined value, said registration means does not store the font data.

14. The character-data processing apparatus according to claim 9, if said decision means decides that the identification data has the predetermined value, said registration means stores the font data without conversion by said endian conversion means.

15. The character-data processing apparatus according to claim 9, further comprising font storage means in which font data is prestored, wherein said decision means uses identification data of the font data stored in said font storage means as the predetermined value.

16. The character-data processing apparatus according to claim 9, further comprising output means for outputting a character pattern based on the font data stored by said registration means.

17. The character-data processing apparatus according to claim 16, wherein said output means includes a printer.

18. The character-data processing apparatus according to claim 17, wherein the printer is an electrophotographic printer or an ink-jet printer.

19. The character-data processing apparatus according to claim 16, wherein said output means includes a display unit.

20. A computer readable memory in which a program for registering font data into a computer which handles data of a predetermined word length, including;

a judgment step code for judging an endian corresponding to input font data;

an endian-conversion step code for converting structure of the font data based on the result from judgment at said judgment step, in accordance with a predetermined rule; and

a registration step code for storing in a memory the font data converted at said endian conversion step.