Multiple height proportioned character generation

Details Multiple height proportioned character generation Multiple height proportioned character generation

G - Physics

06

F

375/15

G06F 3/153 (2006.01) G09G 1/00 (2006.01) G09G 5/26 (2006.01)

Patent

CA 1166368

Multiple Height Proportioned Character Generation Abstract A system and method for generating properly propor- tioned alphanumeric characters and symbols in two verti- cal heights with a single character generator and a minimum of associated circuitry. The bits of video data stored in the character generator are stored such that the vertical segments of diagonal portions of the charac- ters and symbols include no more than two bits per vertical segment of the diagonal portion. The video data bits representative of the pels of circular portions of the symbols are stored in an arrangement to generate a horizontally elongated elliptical shape when the charac- ter or symbol is displayed in the shorter of the two heights. Whenever possible, the diagonal portions of characters include no more than two diagonally disposed pels in the single high character size. For represen- tation of a single dot portion of one of the characters or symbols, a pair of video data bits is stored to generate a pair of horizontally disposed pels on the display when the character or symbol is displayed in the shorter of the two vertical heights. Translation logic is described to efficiently provide for two sizes of characters with a minimum of additional hardware and with no additional character generator memory beyond that required for the smallest characters or symbols. AT9-79-035

374653

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