PRINT(2)
NAME
Print − printing system
SYNOPSIS
include "print.m"; print := load Print Print->PATH;
Print: module { PATH: con "/dis/lib/print/print.dis"; CONFIG_PATH: con "/lib/print/";
init: fn(): int; set_printfd: fn(fd: ref Sys->FD); print_image: fn(p: ref Printer, display: ref Draw->Display, im: ref Draw->Image, pcwidth: int): int; print_textfd: fn(p: ref Printer, fd: ref Sys->FD, ps: real, pr: int, wrap: int): int; get_defprinter: fn(): ref Printer; set_defprinter: fn(p: ref Printer); get_size: fn(p: ref Printer): (int, real, real); # dpi, xinches, yinches get_printers: fn(): list of ref Printer; get_papers: fn(): list of ref Paper; save_settings: fn(): int;
# Printer types
Ptype: adt { name: string; modes: list of ref Pmode; driver: string; hpmapfile: string; };
# Paper sizes
Paper: adt { name: string; hpcode: string; width_inches: real; height_inches: real; };
# Print modes
Pmode: adt { name: string; desc: string; resx: int; resy: int; blackdepth: int; coldepth: int; blackresmult: int; };
# Print options
Popt: adt { name: string; mode: ref Pmode; paper: ref Paper; orientation: int; duplex: int; };
# Printer instance
PORTRAIT: con 0; LANDSCAPE: con 1;
DUPLEX_OFF: con 0; DUPLEX_LONG: con 1; DUPLEX_SHORT: con 2;
Printer: adt { name: string; ptype: ref Ptype; device: string; popt: ref Popt; pdriver: Pdriver; };
};
Pdriver: module { PATHPREFIX: con "/dis/lib/print/"; DATAPREFIX: con "/lib/print/";
init: fn(debug: int); sendimage: fn(p: ref Print->Printer, tfd: ref Sys->FD, display: ref Draw->Display, im: ref Draw->Image, width: int, lmargin: int): int; sendtextfd: fn(p: ref Print->Printer, pfd, tfd: ref Sys->FD, ps: real, pr: int, wrap: int): int; printable_pixels: fn(p: ref Print->Printer): (int, int);
};
DESCRIPTION
The Print module provides an interface to one or more printers.
The Print module
init() Init should be called once to initialise the internal state of Print.
set_printfd(fd)
set_printfd provides a file descriptor to be used for output. By default, output is sent to the file or device specified in the Printer adt.
print_image(p,display,im,pcwidth)
print_image prints a page containing a single image. The image is centred horizontally, and is scaled up to fill the percentage of the available width specified by pcwidth.
print_textfd(p,fd,ps,pr,wrap
print_textfd prints one or more pages of text on printer p from the file open for reading on fd. The point size is controlled by p. If the printer does not support the specified point size an alternative size will be used. A point size of 0.0 can be used to select the printer’s default size (usually 12 point). If pr is non-zero, a proportionally-spaced font If wrap is non-zero, lines will be wrapped if they overflow the page width (if this feature is supported by the printer).
get_defprinter()
get_defprinter returns the default printer (in /lib/print/defprinter).
set_defprinter(p)
set_defprinter sets the default printer (in /lib/print/defprinter).
get_size(p)
get_size returns the resolution in dots per inch and the total number of pixels available for printing in the x and y direction. Before calling this function the orientation should be set if required.
get_printers()
get_printers returns a list of all available printers (in /lib/print/printer.cfg).
get_papers()
get_papers returns a list of all available paper sizes (in /lib/print/paper.cfg).
Data Structures
Ptype
- specifies a Printer Type, with fields:
name:
Name used to refer to this printer type
desc Description
modes
List of supported print modes
driver:
The .dis file specification of the printer driver
hpmapfile:
For HP printers, the name of the color map file
Paper
- specifies the dimensions of a type of paper
name:
Name used to refer to this paper size
hpcode:
For HP printers, PCL code used for this paper size
width_inches:
Width of paper in inches
height_inches:
Height of paper in inches
Pmode
- specifies a print mode
name:
Name used to refer to this print mode
desc: Description
resx: X resolution in dots per inch
resx: Y resolution in dots per inch
blackdepth:
Depth of black component in bytes
coldepth:
Depth of color components in bytes
blackresmult:
Resolution multiplier of black component (1 means same as base x resolution)
Popt
- specifies a set of Print Options
name:
Name of a Printer to which these print options apply
mode:
The name of a print mode
paper:
The name of a paper size
orientation:
Paper orientation - either PORTRAIT or LANDSCAPE
duplex (NB DUPLEX IS NOT CURRENTLY
Duplex setting - DUPLEX_OFF or DUPLEX_SHORT or DUPLEX_LONG
Printer
- specifies a printer instance
name:
Name used to refer to this printer
ptype:
The printer type
device:
The name of the file to be used for output (eg /dev/lpt1data)
popt: The print options
driver:
The printer driver module handle
Configuration Files
There are configuration files to initialize the Printer Types, Print Modes, Paper Sizes Printers and Print Modes. They all have a similar format, with fields corresponding to the relevant adt. Here is an extract from the paper.cfg file:
A4= hpcode=26 width_inches=8.3 height_inches=11.7 A5= hpcode=25 width_inches=4.15 height_inches=5.85
Aliases can also be defined, such as
myA4=A4
The final configuration file, defprinter, just contains the name of the default printer.
FILES
/lib/print/*.map
HP color maps.
/lib/print/ptype.cfg
Print Type configuration file.
/lib/print/pmode.cfg
Print Mode configuration file.
/lib/print/paper.cfg
Paper Size configuration file.
/lib/print/printer.cfg
Printer Instance configuration file.
/lib/print/popts.cfg
Print options configuration file.
/lib/print/defprinter
Holds the name of the default printer. Not needed if there is only one printer available.
SOURCE
/appl/lib/print/print.b
Implementation of the Print module.
/appl/lib/print/*_driver.b
Printer-specific driver modules
/appl/lib/print/scaler.b
Scaler module