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A method is described to determine when to load printer fonts when it is not possible to read font information directly from the printer.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
84% of the total text.
Page 1 of 1
A Method to Reload Printer Fonts
A method is described to determine when to load printer fonts when it is not
possible to read font information directly from the printer.
In an environment where multiple users, applications, and operating systems
can access the same printer and that printer has loadable fonts (either from the
host or an internal printer diskette) it is very difficult for any one user, application,
or operating system to know fur sure which fonts are loaded at a given time
unless that user, application, or operating system explicitly loads them and is
allowed to retain control of the device until it has completed its desired job. For
most printers, font loading is an operation that may require sev seconds. If font
information is not accessible from the printer device directly, then every print job
would have to reload fonts to assure the proper font set. This would severely
degrade printer throughput without any functional advantage.
In order to reduce the severity of this problem, a data area is reserved in the
Unix Print Device Driver to track font status changes across print jobs. This
Printer Device Driver Font status area is set to 0 at IPL time, indicating that
printer default fonts have been loaded. Applications that change fonts need to
update the font status area with the new font status. Applications can also check
this status area to see if they need to load their special fonts or can use the
already loaded fonts. This avoids the proble...