Efficient method and apparatus for downloading of fonts from processor to printer

A technology of data processing equipment and printers, applied in the direction of digital output to printing unit, electronic digital data processing, visual presentation using printers, etc., can solve the problems of increasing data transmission time and so on

Inactive Publication Date: 2003-04-09
HEWLETT PACKARD CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this procedure eliminates the need to download unneeded symbol data, the downloading of font headers and associated "hhea" and "hmtx" tables increases the time required for data transfer and imposes memory constraints on the printer. necessary requirements

Method used

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  • Efficient method and apparatus for downloading of fonts from processor to printer
  • Efficient method and apparatus for downloading of fonts from processor to printer
  • Efficient method and apparatus for downloading of fonts from processor to printer

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Embodiment Construction

[0019] Briefly stated, the present invention removes the spacing size associated with each symbol from the font header and inserts this data into the associated symbol data structure. Thus, when this symbol data structure is sent to the printer, the spacing dimensions are carried along with the symbol data.

[0020] Such as figure 1 As shown in , the true document 10 is still providing the main processor 12 with the font header as shown in FIG. 2a. However, host processor 12 not only fails to transmit the "hhea" table and "hmtx" table along with the font headers to printer 16, but also prevents the transmission of those tables. Figure 3a A font header of the form shown. Except hhea table and hmtx table are not included, Figure 3a The font header table of is exactly the same as that in Fig. 2a.

[0021] Since the requirements for each new symbol are added to the printer driver 14, the relevant spacing dimensions of the "hmtx" table in the host processor 12 are linked with...

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PUM

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Abstract

A data processing configuration includes a computer, a printer and a font memory which houses tables that define spacing metrics that are individual to each glyph included in a font. The computer is connected to the font memory and further includes a printer driver function element which is controllable to download glyph data to the printer in response to an output from an application, running on the computer, which specifies a requirement that a glyph is to be printed by the said printer. The computer is responsive to a download requirement to derive from the font memory, header data for transmission to the printer.

Description

technical field [0001] The present invention relates to a method and apparatus for downloading outline fonts from a host processor to a printer, and more particularly to a font character that can more efficiently utilize printer memory and avoid storing data into downloaded fonts Download method in unused printer. Background technique [0002] Data transfer time and memory usage are two parameters that substantially affect printer performance. The host processor often stores fonts in the form of outlines and shape descriptions commonly called "true" fonts (trademark of Apple Inc.). True font symbols take the form of data describing the shape and outline of the symbol, and may include one or more Bezier functions. When the data of the true font symbol is output from the font memory, the main processor either directly converts the font data into a raster image of the symbol or directly transmits the font symbol data to the printer (converted into a raster image in the printe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J5/44G06F3/12G06K15/02
CPCG06K2215/0008G06K15/02G06F3/12
Inventor S·孔塞拉C·R·冈宁
Owner HEWLETT PACKARD CO
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