/* Copyright (C) 1999 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: gdevcslw.c,v 1.4 2002/02/21 22:24:51 giles Exp $ */
/* CoStar LabelWriter II, II Plus driver for Ghostscript */
/* Contributed by Mike McCauley mikem@open.com.au        */

#include "gdevprn.h"

/* We round up the LINE_SIZE to a multiple of a ulong for faster scanning. */
typedef ulong word;
#define W sizeof(word)

/* Printer types */
#define LW	0

/* The device descriptors */

private dev_proc_print_page(coslw_print_page);

const gx_device_printer gs_coslw2p_device =
prn_device(prn_std_procs, "coslw2p",
	   200, 400,    /* 2 inches wide */
	   128, 128,    /* 5 dots per mm */
	   0, 0, 0, 0,
	   1, coslw_print_page);

const gx_device_printer gs_coslwxl_device =
prn_device(prn_std_procs, "coslwxl",
	   200, 400,    /* 2 inches wide */
	   204, 204,    /* 8 dots per mm */
	   0, 0, 0, 0,
	   1, coslw_print_page);

/* ------ Internal routines ------ */

/* Send the page to the printer. */
private int
coslw_print_page(gx_device_printer * pdev, FILE * prn_stream)
{
    int line_size = gdev_mem_bytes_per_scan_line((gx_device *) pdev);
    int line_size_words = (line_size + W - 1) / W;
    uint storage_size_words = line_size_words * 8;	/* data, out_row, out_row_alt, prev_row */
    word *storage = (ulong *) gs_malloc(storage_size_words, W,
					"coslw_print_page");

    word *data_words;
#define data ((byte *)data_words)

    byte *out_data;
    int num_rows = dev_print_scan_lines(pdev);
    int bytes_per_line = 0;
    int out_count;
    int code = 0;

    if (storage == 0)		/* can't allocate working area */
	return_error(gs_error_VMerror);
    data_words = storage;

    /* Clear temp storage */
    memset(data, 0, storage_size_words * W);

    /* Initialize printer. */
    if (pdev->PageCount == 0) {
    }

    /* Put out per-page initialization. */

    /* End raster graphics, position cursor at top. */

    /* Send each scan line in turn */
    {
	int lnum;
	int num_blank_lines = 0;
	word rmask = ~(word) 0 << (-pdev->width & (W * 8 - 1));

	/* Transfer raster graphics. */
	for (lnum = 0; lnum < num_rows; lnum++) {
	    register word *end_data =
	    data_words + line_size_words;

	    code = gdev_prn_copy_scan_lines(pdev, lnum,
					    (byte *) data, line_size);
	    if (code < 0)
		break;
	    /* Mask off 1-bits beyond the line width. */
	    end_data[-1] &= rmask;
	    /* Remove trailing 0s. */
	    while (end_data > data_words && end_data[-1] == 0)
		end_data--;
	    if (end_data == data_words) {	/* Blank line */
		num_blank_lines++;
		continue;
	    }

	    /* We've reached a non-blank line. */
	    /* Put out a spacing command if necessary. */
	    while (num_blank_lines > 0)
	    {
		int this_blank = 255;
		if (num_blank_lines < this_blank)
		    this_blank = num_blank_lines;
		fprintf(prn_stream, "\033f\001%c", this_blank);
		num_blank_lines -= this_blank;
	    }

	    /* Perhaps add compression here later? */
	    out_data = data;
	    out_count = (byte *) end_data - data;

	    /* For 2 inch model, max width is 56 bytes */
	    if (out_count > 56)
		out_count = 56;  
	    /* Possible change the bytes per line */
	    if (bytes_per_line != out_count)
	    {
		fprintf(prn_stream, "\033D%c", out_count);
		bytes_per_line = out_count;
	    }

	    /* Transfer the data */
	    fputs("\026", prn_stream);
	    fwrite(out_data, sizeof(byte), out_count, prn_stream);
	}
    }

    /* eject page */
    fputs("\033E", prn_stream);

    /* free temporary storage */
    gs_free((char *)storage, storage_size_words, W, "coslw_print_page");

    return code;
}
