/* Copyright (C) 1998 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: gdevl31s.c,v $ $Revision: 1.2.2.1 $ */
/*
 * H-P LaserJet 3100 driver
 *
 * This is a driver for use with the H-P LaserJet 3100 Software.
 * It requires installed H-P LaserJet 3100 Software to print.
 * It can be used with smbclient to print from an UNIX box
 * to a LaserJet 3100 printer attached to a MS-Windows box.
 *
 * Written by Ulrich Schmid, uschmid@mail.hh.provi.de.
 */

#include "gdevprn.h"
#include "gdevmeds.h"

#define XCORRECTION 0.11
#define YCORRECTION 0.12

/* order matters!             0       1        2        3       4      5     6       7           8 */
const char *media[10]   =  {"a4", "letter", "legal", "com10", "c5",  "dl", "b5", "monarch", "executive", 0};
const int height[2][10] = {{3447,     3240,    4140,    5587, 2644,  5083, 2975,      4387,        3090, 0},
			   {6894,     6480,    8280,   11167, 5288, 10159, 5950,      8767,        6180, 0}};
const int width[2]      = {2528,
			   5056};
#define LARGEST_MEDIUM 2 /* legal */

/* These codes correspond to sequences of pixels with the same color.
 * After the code for a sequence < 64 pixels the color changes.
 * After the code for a sequence with 64 pixels the previous color continues. */ 
private struct {
	uint bits;
	uint length; /* number of valid bits */
} code[2][65] =
/* White */
{{{0x0ac,  8}, {0x038,  6}, {0x00e,  4}, {0x001,  4}, {0x00d,  4}, {0x003,  4}, {0x007,  4}, {0x00f,  4},
  {0x019,  5}, {0x005,  5}, {0x01c,  5}, {0x002,  5}, {0x004,  6}, {0x030,  6}, {0x00b,  6}, {0x02b,  6},
  {0x015,  6}, {0x035,  6}, {0x072,  7}, {0x018,  7}, {0x008,  7}, {0x074,  7}, {0x060,  7}, {0x010,  7},
  {0x00a,  7}, {0x06a,  7}, {0x064,  7}, {0x012,  7}, {0x00c,  7}, {0x040,  8}, {0x0c0,  8}, {0x058,  8},
  {0x0d8,  8}, {0x048,  8}, {0x0c8,  8}, {0x028,  8}, {0x0a8,  8}, {0x068,  8}, {0x0e8,  8}, {0x014,  8},
  {0x094,  8}, {0x054,  8}, {0x0d4,  8}, {0x034,  8}, {0x0b4,  8}, {0x020,  8}, {0x0a0,  8}, {0x050,  8},
  {0x0d0,  8}, {0x04a,  8}, {0x0ca,  8}, {0x02a,  8}, {0x0aa,  8}, {0x024,  8}, {0x0a4,  8}, {0x01a,  8},
  {0x09a,  8}, {0x05a,  8}, {0x0da,  8}, {0x052,  8}, {0x0d2,  8}, {0x04c,  8}, {0x0cc,  8}, {0x02c,  8},
  {0x01b,  5}},
/* Black */
 {{0x3b0, 10}, {0x002,  3}, {0x003,  2}, {0x001,  2}, {0x006,  3}, {0x00c,  4}, {0x004,  4}, {0x018,  5},
  {0x028,  6}, {0x008,  6}, {0x010,  7}, {0x050,  7}, {0x070,  7}, {0x020,  8}, {0x0e0,  8}, {0x030,  9},
  {0x3a0, 10}, {0x060, 10}, {0x040, 10}, {0x730, 11}, {0x0b0, 11}, {0x1b0, 11}, {0x760, 11}, {0x0a0, 11},
  {0x740, 11}, {0x0c0, 11}, {0x530, 12}, {0xd30, 12}, {0x330, 12}, {0xb30, 12}, {0x160, 12}, {0x960, 12},
  {0x560, 12}, {0xd60, 12}, {0x4b0, 12}, {0xcb0, 12}, {0x2b0, 12}, {0xab0, 12}, {0x6b0, 12}, {0xeb0, 12},
  {0x360, 12}, {0xb60, 12}, {0x5b0, 12}, {0xdb0, 12}, {0x2a0, 12}, {0xaa0, 12}, {0x6a0, 12}, {0xea0, 12},
  {0x260, 12}, {0xa60, 12}, {0x4a0, 12}, {0xca0, 12}, {0x240, 12}, {0xec0, 12}, {0x1c0, 12}, {0xe40, 12},
  {0x140, 12}, {0x1a0, 12}, {0x9a0, 12}, {0xd40, 12}, {0x340, 12}, {0x5a0, 12}, {0x660, 12}, {0xe60, 12},
  {0x3c0, 10}}}; 

/* Define the default, maximum resolutions. */
#ifndef X_DPI
#  define X_DPI 600
#endif
#ifndef Y_DPI
#  define Y_DPI 600
#endif

/* The device descriptors */
private dev_proc_print_page_copies(lj3100sw_print_page_copies);
private dev_proc_close_device(lj3100sw_close);

private gx_device_procs prn_lj3100sw_procs = 
    prn_params_procs(gdev_prn_open, gdev_prn_output_page, lj3100sw_close,
	     gdev_prn_get_params, gdev_prn_put_params);

/* workaround to emulate the missing prn_device_margins_copies macro */
#define gx_default_print_page_copies lj3100sw_print_page_copies
gx_device_printer far_data gs_lj3100sw_device =
    prn_device_margins/*_copies*/(prn_lj3100sw_procs, "lj3100sw",
	     DEFAULT_WIDTH_10THS, DEFAULT_HEIGHT_10THS,
	     X_DPI, Y_DPI,
	     XCORRECTION, YCORRECTION,
	     0.25, 0.2, 0.25, 0.2,
	     1, 0 /* lj3100sw_print_page_copies */);
#undef gx_default_print_page_copies

#define ppdev ((gx_device_printer *)pdev)

#define BUFFERSIZE 0x1000

private void
lj3100sw_output_section_header(FILE *prn_stream, int type, int arg1, int arg2)
{
	fputc(type      & 0xff, prn_stream);
	fputc(type >> 8 & 0xff, prn_stream);
	fputc(arg1      & 0xff, prn_stream);
	fputc(arg1 >> 8 & 0xff, prn_stream);
	fputc(arg2      & 0xff, prn_stream);
	fputc(arg2 >> 8 & 0xff, prn_stream);
}

private void
lj3100sw_flush_buffer(FILE *prn_stream, char *buffer, char **pptr)
{
	int size = *pptr - buffer;
	if (size) {
		lj3100sw_output_section_header(prn_stream, 0, size, 0);
		fwrite(buffer, 1, size, prn_stream);
		*pptr = buffer;
	}
}

private void
lj3100sw_output_data_byte(FILE *prn_stream, char *buffer, char **pptr, int val)
{
	if (*pptr >= buffer + BUFFERSIZE)
		lj3100sw_flush_buffer(prn_stream, buffer, pptr);
	*(*pptr)++ = val;
}

private void
lj3100sw_output_repeated_data_bytes(FILE *prn_stream, char *buffer, char **pptr, int val, int num)
{
	int size;
	while (num) {
		if (*pptr >= buffer + BUFFERSIZE)
			lj3100sw_flush_buffer(prn_stream, buffer, pptr);
		size = min(num, buffer + BUFFERSIZE - *pptr);
		memset(*pptr, val, size);
		*pptr += size;
		num -= size;
	}
}

private void
lj3100sw_output_newline(FILE *prn_stream, char *buffer, char **pptr)
{
	lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0);
	lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0);
	lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0x80);
}

private void
lj3100sw_output_empty_line(FILE *prn_stream, char *buffer, char **pptr, bool high_resolution)
{
	if (high_resolution) {
		lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0x80);
		lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0x0f);
		lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0x78);
		lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0xac);
	} else {
		lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0x80);
		lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0x87);
		lj3100sw_output_data_byte(prn_stream, buffer, pptr, 0x0d);
	}
}

private int
lj3100sw_print_page_copies(gx_device_printer *pdev, FILE *prn_stream, int num_copies /* ignored */)
{
	int i, j;
	char buffer[BUFFERSIZE], *ptr = buffer;
	int medium_index = select_medium(pdev, media, LARGEST_MEDIUM);
	bool high_resolution = (pdev->x_pixels_per_inch > 300);
	int printer_height = height[high_resolution ? 1 : 0][medium_index];
	int printer_width  = width[high_resolution ? 1 : 0];
	int paper_height = pdev->height;
	int paper_width  = pdev->width;
	int line_size = gdev_prn_raster(pdev);
	byte *in = (byte *)gs_malloc(line_size, 1, "lj3100sw_print_page");
	byte *data;
	if (in == 0)
		return_error(gs_error_VMerror);
	if (gdev_prn_file_is_new(pdev)) {
		lj3100sw_output_section_header(prn_stream, 1, 0, 0);
		lj3100sw_output_repeated_data_bytes(prn_stream, buffer, &ptr, 0x1b, 12);
		ptr += sprintf(ptr, "\r\nBD");
		lj3100sw_output_repeated_data_bytes(prn_stream, buffer, &ptr, 0, 5520);
		ptr += sprintf(ptr, "%s\r\n%s %d\r\n%s %d\r\n%s %d\r\n%s %d\r\n%s %d\r\n%s %d\r\n",
			       "NJ",
			       "PQ", -1,
			       "RE",  high_resolution ? 6 : 2,
			       "SL",  printer_width,
			       "LM",  0,
			       "PS",  medium_index,
			       "PC",  0);
		lj3100sw_flush_buffer(prn_stream, buffer, &ptr);
	}

	lj3100sw_output_section_header(prn_stream, 3, ppdev->NumCopies, 0);
	ptr += sprintf(ptr, "%s %d\r\n%s\r\n",
		       "CM", 1,
		       "PD");
	*ptr++ = 0;
	lj3100sw_output_newline(prn_stream, buffer, &ptr);

	for (i = 0; i < printer_height; i++) {
		if (i < paper_height) {
			int color = 0; /* white */
			int count = 0;
			int bit_index = 0;
			uint tmp = 0;
			gdev_prn_get_bits(pdev, i, in, &data);
			for (j = 0; j <= printer_width; j++) {
				int xoffset = (printer_width - paper_width) / 2;
				int newcolor = 0;
				if (j >= xoffset && j <  xoffset + paper_width)
					newcolor = (data[(j - xoffset) / 8] >> (7 - (j - xoffset) % 8)) & 1;
				if (j == printer_width)
					newcolor = !color; /* force output */
				if (newcolor == color)
					count++;
				else if (count == printer_width && color == 0) /* implies j == printer_width */
					lj3100sw_output_empty_line(prn_stream, buffer, &ptr, high_resolution);
				else    /* print a sequence of pixels with a uniform color */
					while (newcolor != color) {
						int size = min(count, 64);
						tmp |= code[color][size].bits << bit_index;
						bit_index += code[color][size].length;
						while (bit_index >= 8)	{
							lj3100sw_output_data_byte(prn_stream, buffer, &ptr, tmp & 0xff);
							tmp >>= 8;
							bit_index -= 8;
						}
						if (size == 64)
							count -= 64;
						else {
							color = newcolor;
							count = 1;
						}
					}
			}
			if (bit_index)
				lj3100sw_output_data_byte(prn_stream, buffer, &ptr, tmp & 0xff);
		}
		else
			lj3100sw_output_empty_line(prn_stream, buffer, &ptr, high_resolution);
		lj3100sw_output_newline(prn_stream, buffer, &ptr);
	}

	for (i = 0; i < 3; i++ ) {
		lj3100sw_output_data_byte(prn_stream, buffer, &ptr, 0x00);
		lj3100sw_output_data_byte(prn_stream, buffer, &ptr, 0x08);
		lj3100sw_output_data_byte(prn_stream, buffer, &ptr, 0x80);
	}
	lj3100sw_output_repeated_data_bytes(prn_stream, buffer, &ptr, 0, 520);
	lj3100sw_flush_buffer(prn_stream, buffer, &ptr);

	lj3100sw_output_section_header(prn_stream, 4, 0, 0);
	for (i = 0; i < 4 * ppdev->NumCopies; i++)
		lj3100sw_output_section_header(prn_stream, 54, 0, 0);

	gs_free((char *)in, line_size, 1, "lj3100sw_print_page");
	return 0;
}

private int
lj3100sw_close(gx_device *pdev)
{
	int i;
	FILE *prn_stream = ((gx_device_printer *)pdev)->file;

	lj3100sw_output_section_header(prn_stream, 0, 4, 0);
	fputs("XX\r\n", prn_stream);
	for (i = 0; i < 4 * ppdev->NumCopies; i++)
		lj3100sw_output_section_header(prn_stream, 54, 0, 0);
	lj3100sw_output_section_header(prn_stream, 2, 0, 0);

	return gdev_prn_close(pdev);
}
