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/* Copyright (C) 1993, 1996 Aladdin Enterprises.  All rights reserved.

  This software is provided AS-IS with no warranty, either express or

  implied.

  This software is distributed under license and may not be copied,

  modified or distributed except as expressly authorized under the terms

  of the license contained in the file LICENSE in this distribution.

  For more information about licensing, please refer to

  http://www.ghostscript.com/licensing/. For information on

  commercial licensing, go to http://www.artifex.com/licensing/ or

  contact Artifex Software, Inc., 101 Lucas Valley Road #110,

  San Rafael, CA  94903, U.S.A., +1(415)492-9861.

*/

/* $Id: gdevo182.c,v 1.6 2004/08/10 13:02:36 stefan Exp $*/

/* Okidata Microline 182 printer driver */

/* Contributed by Maarten Koning (smeg@bnr.ca) April 4, 1993 */

/****************************************************************

I use this driver from Unix with the following aliases:

alias psp "gs -q -sDEVICE=oki182 -sOutputFile=\|lpr - <\!*"

alias psphigh "gs -q -sDEVICE=oki182 -r144 -sOutputFile=\|lpr - <\!*"

ps. I have my printer DIP switches set to the following (as viewed

	while standing in front of your printer looking down into the

	config access hatch located at the top of your printer

	in the centre back).

Upper  Upper   Bottom

Left   Right   (at right)

 x	x        x

 x       x	x

 x       x       x

x        x	x

 x	x        x

 x	x        x

x        x	x

 x	x        x

The upper DIP switches are on a SuperSpeed Serial

card that will do 19200 baud.  I have it set at 9600

baud since that seems sufficient to keep the printer

busy.

The important thing is to be in 8-bit mode so that

the graphics data can't match any Okidata commands

(This driver sets the high bit of graphics data to 1).

****************************************************************/

#include "gdevprn.h"

/*

 *  Available resolutions are 72x72 or 144x144;

 *  (144x72) would be possible to do also, but I didn't bother)

 */

/* The device descriptor */

private dev_proc_print_page(oki_print_page);

const gx_device_printer far_data gs_oki182_device =

  prn_device(prn_std_procs, "oki182",

	80,				/* width_10ths, 8.0" */

	110,				/* height_10ths, 11" */

	72,				/* x_dpi */

	72,				/* y_dpi */

	0, 0, 0, 0,			/* margins */

	1, oki_print_page);

/* ------ internal routines ------ */

/* out is a pointer to an array of 7 scan lines,

   lineSize is the number of bytes between a pixel and

   the pixel directly beneath it.

   scanBits is the number of bits in each scan line

   out is a pointer to an array of column data, which

   is how the Okidata wants the graphics image.

   each column of graphics data is 7 bits high and

   is encoded in a byte - highest pixel in the column

   is the lowest bit in the byte.  The upper bit of the

   byte is set so that the okidata doesn't mistake

   graphic image data for graphic commands.

*/

private void

oki_transpose(byte *in, byte *out, int scanBits, register int lineSize)

{

	register bitMask = 0x80;

	register byte *inPtr;

	register byte outByte;

	while (scanBits-- > 0) {

		inPtr = in;

		if (*inPtr & bitMask)

			outByte = 0x81;

		else

			outByte = 0x80;

		if (*(inPtr += lineSize) & bitMask)

			outByte += 0x02;

		if (*(inPtr += lineSize) & bitMask)

			outByte += 0x04;

		if (*(inPtr += lineSize) & bitMask)

			outByte += 0x08;

		if (*(inPtr += lineSize) & bitMask)

			outByte += 0x10;

		if (*(inPtr += lineSize) & bitMask)

			outByte += 0x20;

		if (*(inPtr += lineSize) & bitMask)

			outByte += 0x40;

		*out++ = outByte;

		if ((bitMask >>= 1) == 0) {

			bitMask = 0x80;

			in ++;

		}

	}

}

/* This routine tries to compress a sequence of okidata

   graphic bytes by trimming off leading and trailing

   zeros.  Trailing zeros can be thrown away and leading

   zeros can be replaced with a much smaller number of spaces.

   'in' is a pointer to the graphic bytes to be compressed.

   origWidth is the number of bytes pointed to by 'in'.

   highRes is non-zero when 144x144 mode is being used.

   numSpaces is set to the number of spaces that should

   be printed before the compressed image. newWidth is

   the new number of bytes that the return value of this

   function points to.

   xxx - A future enhancement would be to replace long sequences

   of embedded zeros with exit.graphics-<n> spaces-enter.graphics

*/

private byte *

oki_compress(byte *in, int origWidth, int highRes,

			int *numSpaces, int *newWidth)

{

	int spaces = 0;

	int columns_per_space = 6;

	byte *in_end = in + origWidth;

	/* remove trailing zeros (which are realy 0x80's) */

	while (in_end > in && in_end[-1] == 0x80)

		in_end --;

	if (highRes)

		columns_per_space = 12;

	/* remove leading zeros that can be replaced by spaces */

	while(in < in_end && in[0] == 0x80 && memcmp((char *)in,

				(char *)in + 1, columns_per_space - 1) == 0) {

		spaces++;

		in += columns_per_space;

	}

	*numSpaces = spaces;

	/* just in case we compressed this line out of existance */

	if (in_end > in)

		*newWidth = in_end - in;

	else

		*newWidth = 0;

	return(in);

}

/* Send the page to the printer. */

private int

oki_print_page(gx_device_printer *pdev, FILE *prn_stream)

{

	int highRes = pdev->y_pixels_per_inch > 100;

	int bits_per_column = 7;

	int i, spaces, width;

	int lcnt;

	int line_size = gdev_prn_raster((gx_device_printer *)pdev);

	byte *in = (byte *)gs_malloc(pdev->memory, 16, line_size, "oki_print_page(in)");

	byte *out1 = (byte *)gs_malloc(pdev->memory, 8, line_size, "oki_print_page(out1)");

	byte *out2 = (byte *)gs_malloc(pdev->memory, 8, line_size, "oki_print_page(out2)");

	byte *out3;

	int lnum = 0;

	int skip = 0;

	int code = 0;

	if ( in == 0 || out1 == 0 || out2 == 0)

	{	code = gs_error_VMerror;

		gs_note_error(code);

		goto bail;

	}

	/* Initialize the printer. */

	/* CAN; 72x72; left margin = 001; disable skip over perforation */

	fwrite("\030\034\033%C001\033%S0", 1, 12, prn_stream);

	if (highRes) {

		fwrite("\033R", 1, 2, prn_stream);

		bits_per_column = 14;

	}

	/* Transfer pixels to printer */

	while ( lnum < pdev->height ) {

		/* Copy 1 scan line and test for all zero. */

		code = gdev_prn_copy_scan_lines(pdev, lnum, in, line_size);

		if ( code < 0 )

			goto xit;

		/* if line is all zero, skip */

		if ( in[0] == 0 && !memcmp((char *)in, (char *)in + 1,

							line_size - 1)) {

			lnum++;

			if (highRes)

				skip++;

			else

				skip += 2;

			continue;

		}

		/* use fine line feed to get to the appropriate position. */

		while ( skip > 127 ) {

			fputs("\033%5\177", prn_stream);

			skip -= 127;

		}

		if ( skip )

			fprintf(prn_stream, "\033%%5%c",

					(char) (skip & 0xff));

		skip = 0;

		/* get the rest of the scan lines */

		code = gdev_prn_copy_scan_lines(pdev, lnum + 1,

			in + line_size, (bits_per_column - 1) * line_size);

		if ( code < 0 )

			goto xit;

		lcnt = code + 1; /* since we already grabbed one line */

		if ( lcnt < bits_per_column )

			memset(in + lcnt * line_size, 0,

					(bits_per_column - lcnt) * line_size);

		if (highRes) {

			oki_transpose(in, out1, pdev->width, 2 * line_size);

			oki_transpose(in + line_size, out2,

						pdev->width, 2 * line_size);

		} else

			oki_transpose(in, out1, pdev->width, line_size);

		out3 = oki_compress(out1, pdev->width, highRes,

						&spaces, &width);

		for (i=0; i < spaces; i++)

			putc(' ', prn_stream);

		fwrite("\003", 1, 1, prn_stream);

		fwrite(out3, 1, width, prn_stream);

		if (highRes) {

			/* exit graphics; carriage return; 1 bit line feed */

			fprintf(prn_stream, "\003\002\015\033%%5%c", (char) 1);

			out3 = oki_compress(out2, pdev->width, highRes,

							&spaces, &width);

			for (i=0; i < spaces; i++)

				putc(' ', prn_stream);

			fwrite("\003", 1, 1, prn_stream);

			fwrite(out3, 1, width, prn_stream);

			fprintf(prn_stream, "\003\002\015\033%%5%c", (char) 13);

		} else

			fwrite("\003\016\003\002", 1, 4, prn_stream);

		lnum += bits_per_column;

	   }

	/* Eject the page */

xit:

	fputc(014, prn_stream);	/* form feed */

	fflush(prn_stream);

bail:

	if ( out1 != 0 )

		gs_free(pdev->memory, (char *)out1, 8, line_size, "oki_print_page(out1)");

	if ( out2 != 0 )

		gs_free(pdev->memory, (char *)out2, 8, line_size, "oki_print_page(out2)");

	if ( in != 0 )

		gs_free(pdev->memory, (char *)in, 16, line_size, "oki_print_page(in)");

	return code;

}