X Version 11
Release 6.4
X Print Service Extension Library
9
XPContext print_context;
display
Specifies a pointer to the Display structure; returned from XOpenDisplay.
print_context
A pre-existing print context on the same X Server.
XpSetContext sets the print context for a display connection. All subsequent print operations that do not
explicitly take a print context-id (for example,
XpStartJob) on display will use and act upon the print context
set by this call, until the print context is unset or
XpDestroyContext is called. The print context can be set and
used on multiple jobs, if not destroyed.
If print_context is
None, XpSetContext will unset (disassociate) the print context previously associated with
display. If there was no previously associated print context, no action is taken. The content of the formerly
associated print context is not affected by this call, and other display connections may continue to use the
print context.
Since font capabilities can vary from printer to printer,
XpSetContext may modify the list of available fonts
(see
XListFonts) on display, and the actual set of usable fonts (see XLoadFont). A unique combination of fonts
may be available from within a given print context; a client should not assume that all the fonts available
when no print context is set will be available when a print context is set.
When a print context is set on a display connection, the default behavior of
ListFonts and ListFontsWithInfo is
to list all of the fonts normally associated with the X print server (i.e. fonts containing glyphs) as well as any
internal printer fonts defined for the printer. The
xp-listfonts-modes attribute is provided so that applications
can control the behavior of
ListFonts and ListFontsWithInfo and is typically used to show just internal printer
fonts. Using only internal printer fonts is useful for performance reasons; the glyphs associated with the font
are contained within the printer and do not have to be downloaded.
If the value of
xp-listfonts-modes includes xp-list-glyph-fonts, ListFonts and ListFontsWithInfo will include all of
the fonts available to the server that have glyphs associated with them. If the value of
xp-listfonts-modes
includes
xp-list-internal-printer-fonts, then ListFonts and ListFontsWithInfo will include all of the fonts defined as
internal printer fonts.
When the print context is unset or
XpDestroyContext is called, the available fonts on display revert back to
what they were previously.
XpSetContext can generate an XPBadContext error.
Use
XpGetContext to get the current print context-id for a display connection.
XPContext XpGetContext (display)
Display *display;
display
Specifies a pointer to the Display structure; returned from XOpenDisplay.
XpGetContext returns the id of the current print context associated with display. If a print context has not been
set, a value of
None is returned.
Use
XpDestroyContext to unset and destroy a print context.
void XpDestroyContext (display, print_context)
Display *display;
XPContext print_context;
display
Specifies a pointer to the Display structure; returned from XOpenDisplay.
print_context
Specifies the print context to destroy.