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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>Adding a new printer</TITLE
><META
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><DIV
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><H1
><A
NAME="AEN200"
></A
>Chapter 4. Adding a new printer</H1
><P
> This chapter covers adding a new ESCP/2, PCL, or Canon printer.
Writing a new driver module is not covered.
</P
><P
> The three steps to adding a printer are:
<P
></P
><OL
TYPE="1"
><LI
><P
> Add an entry to <TT
CLASS="filename"
>printers.xml</TT
>.
</P
></LI
><LI
><P
> Add the appropriate code and data to the appropriate
driver module.
</P
></LI
><LI
><P
> Tune the printer.
</P
></LI
></OL
>
</P
><P
> Printer information is stored in two places: in
<TT
CLASS="filename"
>printers.xml</TT
> (which contains the list of
printer models available to the the upper-level application),
and in the appropriate driver file
(<TT
CLASS="filename"
>print-escp2.c</TT
>,
<TT
CLASS="filename"
>print-pcl.c</TT
>, or
<TT
CLASS="filename"
>print-canon.c</TT
>).
</P
><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="AEN217"
>4.1. <TT
CLASS="filename"
>printers.xml</TT
></A
></H1
><P
> <TT
CLASS="filename"
>printers.xml</TT
> is an XML file that contains
very simple printer definitions. A schema may be used to
validate the XML (<TT
CLASS="filename"
>src/main/gutenprint.xsd</TT
>).
This is an example definition:
</P
><DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN223"
></A
><PRE
CLASS="programlisting"
><printer name="EPSON Stylus Color 1500" driver="escp2-1500">
<color value="true"/>
<model value="2"/>
<gamma value="0.597"/>
<density value="1.0"/>
</printer></PRE
><P
></P
></DIV
><P
> There are other tags that may be present. The only ones that
are mandatory are <TT
CLASS="literal"
><printer></TT
>,
<TT
CLASS="literal"
><color></TT
> and
<TT
CLASS="literal"
><model></TT
>. The other optional parameters
(<TT
CLASS="literal"
><gamma></TT
> and
<TT
CLASS="literal"
><density></TT
> in this case) can be used to
adjust control settings. This is probably not the right place
for them; the printer drivers themselves should contain this
information. There's probably no good reason for anything but
gamma and density to be in here. Gamma refers to the printer's
gamma factor; density is the desired base ink density for the
printer. The Epson driver contains the density information for
each printer at each resolution internally. An even better
driver would adjust density and possibly even gamma for paper
type. All the more reason not to have that information here.
</P
><P
> If you really are curious about what tags are permitted, please
see the schema. These are the definitions of the tags that do
matter:
</P
><P
></P
><DIV
CLASS="variablelist"
><P
><B
>printdef XML elements</B
></P
><DL
><DT
><TT
CLASS="literal"
><family></TT
></DT
><DD
><P
> This defines what driver module this printer uses. The
attribute <TT
CLASS="literal"
>name</TT
> is the name of the
family driver to associate the printers with, for example
<TT
CLASS="literal"
>escp2</TT
>, <TT
CLASS="literal"
>pcl</TT
>,
<TT
CLASS="literal"
>canon</TT
>, <TT
CLASS="literal"
>ps</TT
> or
<TT
CLASS="literal"
>raw</TT
>. This tag may only contain
<TT
CLASS="literal"
><printer></TT
> elements.
</P
></DD
><DT
><TT
CLASS="literal"
><printer></TT
></DT
><DD
><P
> This starts the definition of a printer. It must contain
the attributes <TT
CLASS="literal"
>name</TT
> and
<TT
CLASS="literal"
>driver</TT
>. <TT
CLASS="literal"
>name</TT
> should
be is the full name of the printer, and must be human
readable. <TT
CLASS="literal"
>driver</TT
> should consist of
alphanumerics and hyphens, and be fairly short.
<TT
CLASS="literal"
>name</TT
> is what will appear in the
user-visible listing of printers, and may be translated
into the user's language, while <TT
CLASS="literal"
>driver</TT
>
is what is actually used to key into the list of printers.
It is legal to have multiple printers with the same driver
name.
</P
></DD
><DT
><TT
CLASS="literal"
><color></TT
></DT
><DD
><P
> This tag may not contain any content, but the
<TT
CLASS="literal"
>value</TT
> attribute may be set to
<TT
CLASS="literal"
>true</TT
> or <TT
CLASS="literal"
>false</TT
>. This
indicates that this printer is capable of color, or is not
capable of color respectively.
</P
></DD
><DT
><TT
CLASS="literal"
><model></TT
></DT
><DD
><P
> This defines a model number. This tag may not contain any
content, but the <TT
CLASS="literal"
>value</TT
> attribute may be
set to a positive integer. This is passed into the
driver, which may do whatever it cares to with
it—index into a table, compute on, or whatever.
This need not be unique.
</P
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