/* Copyright (C) 1999 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: gdevcslw.c,v $ $Revision: 1.2.2.1 $ */
/* 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;
}
