EP0325409A3 - Character generation - Google Patents

Character generation Download PDF

Info

Publication number
EP0325409A3
EP0325409A3 EP89300406A EP89300406A EP0325409A3 EP 0325409 A3 EP0325409 A3 EP 0325409A3 EP 89300406 A EP89300406 A EP 89300406A EP 89300406 A EP89300406 A EP 89300406A EP 0325409 A3 EP0325409 A3 EP 0325409A3
Authority
EP
European Patent Office
Prior art keywords
character
addresses
instructions
parameters
fonts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89300406A
Other languages
German (de)
French (fr)
Other versions
EP0325409A2 (en
Inventor
Neil Francis Trevett
Malcolm Eric Wilson
Sarah Jane Lloyd
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3Dlabs Ltd
Original Assignee
DuPont Pixel Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DuPont Pixel Systems Ltd filed Critical DuPont Pixel Systems Ltd
Publication of EP0325409A2 publication Critical patent/EP0325409A2/en
Publication of EP0325409A3 publication Critical patent/EP0325409A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/24—Generation of individual character patterns
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/39—Control of the bit-mapped memory
    • G09G5/393—Arrangements for updating the contents of the bit-mapped memory

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Document Processing Apparatus (AREA)

Abstract

A system and method stores fonts and generates characters. Instead of the fonts containing bit maps, the storage area (116) for each character contains the addresses (GPCR Addresses) of instructions to be used to form the character, and the required parameters for those instructions. In a preferred embodiment, a lookup table (114) for the font contains, for each character, the address of the code to start executing and details of how much more information is stored for this character and where to find it. For each character, the stored information includes addresses of microcode instructions (126) followed by the required number of parameters to define the actions necessary for character generation.
EP89300406A 1988-01-19 1989-01-17 Character generation Withdrawn EP0325409A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8801125A GB2214676A (en) 1988-01-19 1988-01-19 Character generation
GB8801125 1988-01-19

Publications (2)

Publication Number Publication Date
EP0325409A2 EP0325409A2 (en) 1989-07-26
EP0325409A3 true EP0325409A3 (en) 1990-05-02

Family

ID=10630188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89300406A Withdrawn EP0325409A3 (en) 1988-01-19 1989-01-17 Character generation

Country Status (2)

Country Link
EP (1) EP0325409A3 (en)
GB (1) GB2214676A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0138334B1 (en) * 1994-06-22 1998-05-15 김광호 Recording medium for a karaoke
GB2346470B (en) 1999-02-05 2003-10-29 Advanced Risc Mach Ltd Bitmap font data storage within data processing systems

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296898A1 (en) * 1974-12-30 1976-07-30 Barda Jean Francis Method to display data on television screen - uses non-visible signals on cathodic screen to control line and page presentation of data
US4346377A (en) * 1980-05-30 1982-08-24 Eltra Corporation Method and apparatus for encoding and generating characters in a display
GB2098836A (en) * 1981-05-19 1982-11-24 Western Electric Co Communication terminal and method of visual display
US4658248A (en) * 1984-11-01 1987-04-14 Microtel Limited Method for generating stroke-vector characters for use in a display system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2037545B (en) * 1978-05-31 1983-03-30 Purdy H Reproduction of character images particularly for typesetting apparatus
GB2050019B (en) * 1979-05-25 1982-11-10 Loh Shiu Chang Method of producing typographical data
US4286329A (en) * 1979-12-17 1981-08-25 International Business Machines Corporation Complex character generator
DE3134282A1 (en) * 1981-08-29 1983-03-10 Olympia Werke Ag, 2940 Wilhelmshaven METHOD FOR PRESENTING IDEOGRAPHIC SIGNS AND COMPARABLE GRAPHICS
DE3275777D1 (en) * 1982-06-01 1987-04-23 Zhang Song Zhi The representation of character images in a compact form for computer storage
WO1986005905A1 (en) * 1985-03-29 1986-10-09 Lo Shui Yin Improved method and apparatus for specifying and forming characters
IE852259L (en) * 1985-09-13 1987-03-13 Scottish & Newcastle Breweries A method and apparatus for constructing, storing and¹displaying characters
GB8602836D0 (en) * 1986-02-05 1986-03-12 Philips Electronic Associated Data display apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296898A1 (en) * 1974-12-30 1976-07-30 Barda Jean Francis Method to display data on television screen - uses non-visible signals on cathodic screen to control line and page presentation of data
US4346377A (en) * 1980-05-30 1982-08-24 Eltra Corporation Method and apparatus for encoding and generating characters in a display
GB2098836A (en) * 1981-05-19 1982-11-24 Western Electric Co Communication terminal and method of visual display
US4658248A (en) * 1984-11-01 1987-04-14 Microtel Limited Method for generating stroke-vector characters for use in a display system

Also Published As

Publication number Publication date
GB2214676A (en) 1989-09-06
GB8801125D0 (en) 1988-02-17
EP0325409A2 (en) 1989-07-26

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