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From: webb@udel.edu (David Webb)
Newsgroups: comp.sys.amiga
Subject: (none)
Message-ID: <2060@nigel.udel.EDU>
Date: 19 Oct 89 14:33:12 GMT
Sender: mmdf@udel.EDU
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Date: Wed, 18 Oct 89 16:43:55 EDT
From: Ewout Walraven - CATS <ewout@cbmvax.uucp>
Message-Id: <8910182043.AA11581@cbmvax.UUCP>
To: mmdf@udel.edu
Subject: Re: Printer drivers
Newsgroups: comp.sys.amiga
In-Reply-To: <1663@nigel.udel.EDU>
Organization: Commodore Technology, West Chester, PA
Cc:  

In article <1663@nigel.udel.EDU> you write:
>I have an old C.Itoh Starwriter F10 for which I've cobbled up a driver.
>It's a daisy wheel printer, and the driver handles spacing and the
>like just fine. However, there are no abilities in the printer itself
>to do automatic underlines, bolding, etc. These can be done (and are
>done by some software like Word Perfect) by using backspace-underline
>to underline text, or double striking to get bolding.
>   I'd like to get these effects by modifying the printer driver, as it
>seems Nature (should have?) intended. The RKMs I have are however not

Yes this can be done. Hope you wrote a V1.3 driver.

What you'll have to do is the following:

In printertag.asm:

import the _ConvFunc name (ie add XREF _ConvFunc)
export some flag(s) to indicate you wanna do underlining, bold or whatever.
(ie XDEF _UnderlineFlag, XDEF _BoldFlag etc)

Have the field after the printmode point to your ConvFunc() (ie
change "DC.L 0" to "DC.L _ConvFunc")
Define your flags below this. For example _UnderlineFlag: DC.W  0
and _BoldFlag: DC.W, to makethem words.
(since your flags must be in the code section, NOT in the data section
you have to define them here)

In dospecial.c (or anywhere actually) you now can 
add 'extern short UnderlineFlag, BoldFlag as globals and your own ConvFunc()
routine. Something like this

int
ConvFunc(buf, c, flag)
char *buf, c;      /* the buffer and char to process */
int flag;          /* actually the crlfFlag issued by the printer device */
                   /* which you don't need */
{
    int nr;        /* number of bytes we added to buffer, or -1 if no 
                    * conversion done */
    
    if (UnderlineFlag && (c >= 'a' && c <= 'z' || c >= 'A' && c < 'Z') {
       /* anyway something to test yes user wants to underline, yes
          i can underline this char DON'T change 0x1b and 0x9b! */
       *buf++ = c; /*char itself */
       *buf++ = 0x08; /* backspace */
       *buf++ = '_';  /* 'some' underlining char */
       nr = 3;        /* we added 3 chars to the buffer */
    /* lots of fake capabilities can be added, make sure that nr REALLY
       reflects the TOTAL number of chars added by all enhancements */
    }
    else 
       nr = -1; /* nothing added. If you return 0 the char will be skipped */
    return(nr);
}

Now in DoSpecial() add support for all printer command exceptions you 
want to have and set the flags accordingly, like:
if (*command == aSGR4) /* underline */
    UnderlineFlag = 1;
if (*command == aSGR24) /* underline off */
    UnderlineFlag = 0;
if (*command == aSGR1) /* bold */
    BoldFlag = 1;
if (*command == aSGR22) /* bold off */
    BoldFlag = 0;
if (*command == aSGR0){ /* plain text
    BoldFlag = 0;
    UnderlineFlag = 0;
}

Set all printercommands NOT supported by your printer to \377 in data.c's
CommandTable structure.

That's all there is to it. ConvFunc() gets called automatically by the
printer device, once you've set the pointer in printertag.asm.

Hope this helps.

EC
- --
Ewout Walraven - CATS			Commodore Business Machines, Inc.
PHONE: 215-431-9426			UUCP: {uunet|rutgers}!cbmvax!ewout

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