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/* Copyright (C) 1992, 1993, 1994, 1997, 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: gdevmgr.c,v 1.8 2005/01/19 00:24:07 dan Exp $*/

/* MGR device driver */

#include "gdevprn.h"

#include "gdevpccm.h"

#include "gdevmgr.h"

/* Structure for MGR devices, which extend the generic printer device. */

struct gx_device_mgr_s {

	gx_device_common;

	gx_prn_device_common;

	/* Add MGR specific variables */

	int mgr_depth;

};

typedef struct gx_device_mgr_s gx_device_mgr;

static struct nclut clut[256];

private unsigned int clut2mgr(int, int);

private void swap_bwords(unsigned char *, int);

/* ------ The device descriptors ------ */

/*

 * Default X and Y resolution.

 */

#define X_DPI 72

#define Y_DPI 72

/* Macro for generating MGR device descriptors. */

#define mgr_prn_device(procs, dev_name, num_comp, depth, mgr_depth,\

	max_gray, max_rgb, dither_gray, dither_rgb, print_page)\

{	prn_device_body(gx_device_mgr, procs, dev_name,\

	  DEFAULT_WIDTH_10THS, DEFAULT_HEIGHT_10THS, X_DPI, Y_DPI,\

	  0, 0, 0, 0,\

	  num_comp, depth, max_gray, max_rgb, dither_gray, dither_rgb,\

	  print_page),\

	  mgr_depth\

}

/* For all mgr variants we do some extra things at opening time. */

/* private dev_proc_open_device(gdev_mgr_open); */

#define gdev_mgr_open gdev_prn_open		/* no we don't! */

/* And of course we need our own print-page routines. */

private dev_proc_print_page(mgr_print_page);

private dev_proc_print_page(mgrN_print_page);

private dev_proc_print_page(cmgrN_print_page);

/* The device procedures */

private gx_device_procs mgr_procs =

    prn_procs(gdev_mgr_open, gdev_prn_output_page, gdev_prn_close);

private gx_device_procs mgrN_procs =

    prn_color_procs(gdev_mgr_open, gdev_prn_output_page, gdev_prn_close,

	gx_default_gray_map_rgb_color, gx_default_gray_map_color_rgb);

private gx_device_procs cmgr4_procs =

    prn_color_procs(gdev_mgr_open, gdev_prn_output_page, gdev_prn_close,

	pc_4bit_map_rgb_color, pc_4bit_map_color_rgb);

private gx_device_procs cmgr8_procs =

    prn_color_procs(gdev_mgr_open, gdev_prn_output_page, gdev_prn_close,

	mgr_8bit_map_rgb_color, mgr_8bit_map_color_rgb);

/* The device descriptors themselves */

gx_device_mgr far_data gs_mgrmono_device =

  mgr_prn_device( mgr_procs,  "mgrmono", 1,  1, 1,   1,   0, 2, 0, mgr_print_page);

gx_device_mgr far_data gs_mgrgray2_device =

  mgr_prn_device(mgrN_procs,  "mgrgray2",1,  8, 2, 255,   0, 4, 0, mgrN_print_page);

gx_device_mgr far_data gs_mgrgray4_device =

  mgr_prn_device(mgrN_procs,  "mgrgray4",1,  8, 4, 255,   0,16, 0, mgrN_print_page);

gx_device_mgr far_data gs_mgrgray8_device =

  mgr_prn_device(mgrN_procs,  "mgrgray8",1,  8, 8, 255,   0, 0, 0, mgrN_print_page);

gx_device_mgr far_data gs_mgr4_device =

  mgr_prn_device(cmgr4_procs, "mgr4",    3,  8, 4,   1,   1, 2, 2, cmgrN_print_page);

gx_device_mgr far_data gs_mgr8_device =

  mgr_prn_device(cmgr8_procs, "mgr8",    3,  8, 8, 255, 255, 6, 5, cmgrN_print_page);

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

/* Define a "cursor" that keeps track of where we are in the page. */

typedef struct mgr_cursor_s {

	gx_device_mgr *dev;

	int bpp;			/* bits per pixel */

	uint line_size;			/* bytes per scan line */

	byte *data;			/* output row buffer */

	int lnum;			/* row within page */

} mgr_cursor;

/* Begin an MGR output page. */

/* Write the header information and initialize the cursor. */

private int

mgr_begin_page(gx_device_mgr *bdev, FILE *pstream, mgr_cursor *pcur)

{	struct b_header head;

	uint line_size =

		gdev_prn_raster((gx_device_printer *)bdev) + 3;

	byte *data = (byte *)gs_malloc(bdev->memory, line_size, 1, "mgr_begin_page");

	if ( data == 0 )

		return_error(gs_error_VMerror);

	/* Write the header */

	B_PUTHDR8(&head, bdev->width, bdev->height, bdev->mgr_depth);

	fprintf(pstream, "");

	if ( fwrite(&head, 1, sizeof(head), pstream) < sizeof(head) )

		return_error(gs_error_ioerror);

	fflush(pstream);

	/* Initialize the cursor. */

	pcur->dev = bdev;

	pcur->bpp = bdev->color_info.depth;

	pcur->line_size = line_size;

	pcur->data = data;

	pcur->lnum = 0;

	return 0;

}

/* Advance to the next row.  Return 0 if more, 1 if done. */

private int

mgr_next_row(mgr_cursor *pcur)

{	if ( pcur->lnum >= pcur->dev->height )

	{	gs_free(((gx_device_printer *)pcur->dev)->memory,

			(char *)pcur->data, pcur->line_size, 1,

			"mgr_next_row(done)");

		return 1;

	   }

	gdev_prn_copy_scan_lines((gx_device_printer *)pcur->dev,

				 pcur->lnum++, pcur->data, pcur->line_size);

	return 0;

}

/* ------ Individual page printing routines ------ */

#define bdev ((gx_device_mgr *)pdev)

/* Print a monochrome page. */

private int

mgr_print_page(gx_device_printer *pdev, FILE *pstream)

{	mgr_cursor cur;

	int mgr_wide;

	int code = mgr_begin_page(bdev, pstream, &cur);

	if ( code < 0 ) return code;

	mgr_wide = bdev->width;

	if (mgr_wide & 7)

	   mgr_wide += 8 - (mgr_wide & 7);

	while ( !(code = mgr_next_row(&cur)) )

	   {	if ( fwrite(cur.data, sizeof(char), mgr_wide / 8, pstream) <

                    mgr_wide / 8)

		return_error(gs_error_ioerror);

	   }

	return (code < 0 ? code : 0);

}

/* Print a gray-mapped page. */

static unsigned char bgreytable[16], bgreybacktable[16];

static unsigned char bgrey256table[256], bgrey256backtable[256];        

private int

mgrN_print_page(gx_device_printer *pdev, FILE *pstream)

{	mgr_cursor cur;

	int i = 0, j, k, mgr_wide;

	uint mgr_line_size;

	byte *bp, *data = NULL, *dp;

	int code = mgr_begin_page(bdev, pstream, &cur);

	if ( code < 0 ) return code;

	mgr_wide = bdev->width;

	if ( bdev->mgr_depth == 2 && mgr_wide & 3 )

            mgr_wide += 4 - (mgr_wide & 3);

	if ( bdev->mgr_depth == 4 && mgr_wide & 1 )

            mgr_wide++;

	mgr_line_size = mgr_wide / ( 8 / bdev->mgr_depth );

	if ( bdev->mgr_depth == 4 )

            for ( i = 0; i < 16; i++ ) {

		bgreytable[i] = mgrlut[LUT_BGREY][RGB_RED][i];

		bgreybacktable[bgreytable[i]] = i;

            }

	if ( bdev->mgr_depth == 8 ) {

            for ( i = 0; i < 16; i++ ) {

		bgrey256table[i] = mgrlut[LUT_BGREY][RGB_RED][i] << 4;

		bgrey256backtable[bgrey256table[i]] = i;

            }

            for ( i = 16,j = 0; i < 256; i++ ) {

		for ( k = 0; k < 16; k++ )

                  if ( j == mgrlut[LUT_BGREY][RGB_RED][k] << 4 ) {

                    j++;

                    break;

                  }

		bgrey256table[i] = j;

		bgrey256backtable[j++] = i;

            }

	}

	if ( bdev->mgr_depth != 8 )

	    data = (byte *)gs_malloc(pdev->memory, mgr_line_size, 1, "mgrN_print_page");

	while ( !(code = mgr_next_row(&cur)) )

	   {

		switch (bdev->mgr_depth) {

			case 2:

				for (i = 0,dp = data,bp = cur.data; i < mgr_line_size; i++) {

					*dp =	*(bp++) & 0xc0;

					*dp |= (*(bp++) & 0xc0) >> 2;

					*dp |= (*(bp++) & 0xc0) >> 4;

                                    *(dp++) |= (*(bp++) & 0xc0) >> 6;

				}

                		if ( fwrite(data, sizeof(byte), mgr_line_size, pstream) < mgr_line_size )

                                	return_error(gs_error_ioerror);

				break;

			case 4:

				for (i = 0,dp = data, bp = cur.data; i < mgr_line_size; i++) {

					*dp =  bgreybacktable[*(bp++) >> 4] << 4;

                                    *(dp++) |= bgreybacktable[*(bp++) >> 4];

				}

                		if ( fwrite(data, sizeof(byte), mgr_line_size, pstream) < mgr_line_size )

                                	return_error(gs_error_ioerror);

				break;

			case 8:

				for (i = 0,bp = cur.data; i < mgr_line_size; i++, bp++)

	                              *bp = bgrey256backtable[*bp];

                		if ( fwrite(cur.data, sizeof(cur.data[0]), mgr_line_size, pstream)

					< mgr_line_size )

                                	return_error(gs_error_ioerror);

				break;

		}  

	   }

	if (bdev->mgr_depth != 8)

	    gs_free(bdev->memory, (char *)data, mgr_line_size, 1, "mgrN_print_page(done)");

	if (bdev->mgr_depth == 2) {

            for (i = 0; i < 4; i++) {

               clut[i].colnum = i;

               clut[i].red    = clut[i].green = clut[i].blue = clut2mgr(i, 2);

	    }

   	}

	if (bdev->mgr_depth == 4) {

            for (i = 0; i < 16; i++) {

               clut[i].colnum = i;

               clut[i].red    = clut[i].green = clut[i].blue = clut2mgr(bgreytable[i], 4);

	    }

   	}

	if (bdev->mgr_depth == 8) {

            for (i = 0; i < 256; i++) {

               clut[i].colnum = i;

               clut[i].red    = clut[i].green = clut[i].blue = clut2mgr(bgrey256table[i], 8);

	    }

   	}

#if !arch_is_big_endian

	swap_bwords( (unsigned char *) clut, sizeof( struct nclut ) * i );

#endif

	if ( fwrite(&clut, sizeof(struct nclut), i, pstream) < i )

            return_error(gs_error_ioerror);

	return (code < 0 ? code : 0);

}

/* Print a color page. */

private int

cmgrN_print_page(gx_device_printer *pdev, FILE *pstream)

{	mgr_cursor cur;

	int i = 0, j, mgr_wide, r, g, b, colors8 = 0;

	uint mgr_line_size;

	byte *bp, *data, *dp;

	ushort prgb[3];

	unsigned char table[256], backtable[256];

	int code = mgr_begin_page(bdev, pstream, &cur);

	if ( code < 0 ) return code;

	mgr_wide = bdev->width;

	if (bdev->mgr_depth == 4 && mgr_wide & 1)

            mgr_wide++;

	mgr_line_size = mgr_wide / (8 / bdev->mgr_depth);

       	data = (byte *)gs_malloc(pdev->memory, mgr_line_size, 1, "cmgrN_print_page");

       	if ( bdev->mgr_depth == 8 ) {

            memset( table, 0, sizeof(table) );

            for ( r = 0; r <= 6; r++ )

		for ( g = 0; g <= 6; g++ )

       	            for ( b = 0; b <= 6; b++ )

       			if ( r == g && g == b )

                            table[ r + (256-7) ] = 1;

			else

                            table[ (r << 5) + (g << 2) + (b >> 1) ] = 1;

            for ( i = j = 0; i < sizeof(table); i++ )

		if ( table[i] == 1 ) {

                    backtable[i] = j;

                    table[j++] = i;

		}

            colors8 = j;

	}

	while ( !(code = mgr_next_row(&cur)) )

	   {

		switch (bdev->mgr_depth) {

			case 4:

				for (i = 0,dp = data, bp = cur.data; i < mgr_line_size; i++) {

					*dp =  *(bp++) << 4;

                                    *(dp++) |= *(bp++) & 0x0f;

				}

                		if ( fwrite(data, sizeof(byte), mgr_line_size, pstream) < mgr_line_size )

                                	return_error(gs_error_ioerror);

				break;

			case 8:

				for (i = 0,bp = cur.data; i < mgr_line_size; i++, bp++)

	                              *bp = backtable[*bp] + MGR_RESERVEDCOLORS;

                		if ( fwrite(cur.data, sizeof(cur.data[0]), mgr_line_size, pstream) < mgr_line_size )

                                	return_error(gs_error_ioerror);

				break;

		}  

	   }

       	gs_free(bdev->memory, (char *)data, mgr_line_size, 1, "cmgrN_print_page(done)");

	if (bdev->mgr_depth == 4) {

            for (i = 0; i < 16; i++) {

               pc_4bit_map_color_rgb((gx_device *)0, (gx_color_index) i, prgb);

               clut[i].colnum = i;

               clut[i].red    = clut2mgr(prgb[0], 16);

               clut[i].green  = clut2mgr(prgb[1], 16);

               clut[i].blue   = clut2mgr(prgb[2], 16);

	    }

   	}

	if (bdev->mgr_depth == 8) {

            for (i = 0; i < colors8; i++) {

               mgr_8bit_map_color_rgb((gx_device *)0, (gx_color_index)

                   table[i], prgb);

               clut[i].colnum = MGR_RESERVEDCOLORS + i;

               clut[i].red    = clut2mgr(prgb[0], 16);

               clut[i].green  = clut2mgr(prgb[1], 16);

               clut[i].blue   = clut2mgr(prgb[2], 16);

	    }

   	}

#if !arch_is_big_endian

	swap_bwords( (unsigned char *) clut, sizeof( struct nclut ) * i );

#endif    

	if ( fwrite(&clut, sizeof(struct nclut), i, pstream) < i )

            return_error(gs_error_ioerror);

	return (code < 0 ? code : 0);

}

/* Color mapping routines for 8-bit color with a fixed palette */

/* (3 bits of R, 3 bits of G, 2 bits of B). */

/* We have to trade off even spacing of colors along each axis */

/* against the desire to have real gray shades; */

/* MGR compromises by using a 7x7x4 "cube" with extra gray shades */

/* (1/6, 1/2, and 5/6), instead of the obvious 8x8x4. */

gx_color_index

mgr_8bit_map_rgb_color(gx_device *dev, const gx_color_value cv[])

{

	uint rv = cv[0] / (gx_max_color_value / 7 + 1);

	uint gv = cv[1] / (gx_max_color_value / 7 + 1);

	uint bv = cv[2] / (gx_max_color_value / 7 + 1);

	return (gx_color_index)

		(rv == gv && gv == bv ? rv + (256-7) :

		 (rv << 5) + (gv << 2) + (bv >> 1));

}

int

mgr_8bit_map_color_rgb(gx_device *dev, gx_color_index color,

  gx_color_value prgb[3])

{	static const gx_color_value ramp[8] =

	{	0, gx_max_color_value / 6, gx_max_color_value / 3,

		gx_max_color_value / 2, 2 * (gx_max_color_value / 3),

		5 * (gx_max_color_value / 6), gx_max_color_value,

		/* The 8th entry is not actually ever used, */

		/* except to fill out the palette. */

		gx_max_color_value

	};

#define icolor (uint)color

	if ( icolor >= 256-7 )

	{	prgb[0] = prgb[1] = prgb[2] = ramp[icolor - (256-7)];

	}

	else

	{	prgb[0] = ramp[(icolor >> 5) & 7];

		prgb[1] = ramp[(icolor >> 2) & 7];

		prgb[2] = ramp[(icolor & 3) << 1];

	}

#undef icolor

	return 0;

}

/* convert the 8-bit look-up table into the standard MGR look-up table */

private unsigned int

clut2mgr(

  register int v,		/* value in clut */

  register int bits		/* number of bits in clut */

)

{

  register unsigned int i;

  i = (unsigned int) 0xffffffff / ((1<<bits)-1);

  return((v*i)/0x10000);

}

/*

 * s w a p _ b w o r d s

 */

private void

swap_bwords(register unsigned char *p, int n)

{

  register unsigned char c;

  n /= 2;

  for (; n > 0; n--, p += 2) {

    c    = p[0];

    p[0] = p[1];

    p[1] = c;

  }

}