/* Copyright (C) 1989, 1990, 1991 Aladdin Enterprises.  All rights reserved.
  
  This file is part of Aladdin Ghostscript.
  
  Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
  or distributor accepts any responsibility for the consequences of using it,
  or for whether it serves any particular purpose or works at all, unless he
  or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
  License (the "License") for full details.
  
  Every copy of Aladdin Ghostscript must include a copy of the License,
  normally in a plain ASCII text file named PUBLIC.  The License grants you
  the right to copy, modify and redistribute Aladdin Ghostscript, but only
  under certain conditions described in the License.  Among other things, the
  License requires that the copyright notice and this notice be preserved on
  all copies.
*/

/*$Id: gdevdjtc.c $*/
/* HP DeskJet 500C driver */
#include "gdevprn.h"
#include "gdevpcl.h"
#include "malloc_.h"

/***
 *** Note: this driver was contributed by a user, Alfred Kayser:
 ***       please contact AKayser@et.tudelft.nl if you have questions.
 ***/
                                              
#ifndef SHINGLING        /* Interlaced, multi-pass printing */
#define SHINGLING 1      /* 0 = none, 1 = 50%, 2 = 25%, 2 is best & slowest */
#endif

#ifndef DEPLETION        /* 'Intelligent' dot-removal */ 
#define DEPLETION 1      /* 0 = none, 1 = 25%, 2 = 50%, 1 best for graphics? */
#endif                   /* Use 0 for transparencies */

#define X_DPI 300
#define Y_DPI 300
/* bytes per line for DeskJet Color */
#define LINE_SIZE ((X_DPI * 85 / 10 + 63) / 64 * 8)

/* The device descriptors */
private dev_proc_print_page(djet500c_print_page);

private gx_device_procs djet500c_procs =
  prn_color_procs(gdev_prn_open, gdev_prn_output_page, gdev_prn_close,
    gdev_pcl_3bit_map_rgb_color, gdev_pcl_3bit_map_color_rgb);

gx_device_printer far_data gs_djet500c_device =
  prn_device(djet500c_procs, "djet500c",
    85,                /* width_10ths, 8.5" */
    120,		/* height_10ths, 12" */
    X_DPI, Y_DPI,
    0.25, 0.25, 0.25, 0.25,        /* margins */
    3, djet500c_print_page);

/* Forward references */
private int djet500c_print_page(P2(gx_device_printer *, FILE *));

static int mode2compress(P3(byte *row, byte *end_row, byte *compressed));

/* The DeskJet 500C uses additive colors in separate planes. */
/* We only keep one bit of color, with 1 = R, 2 = G, 4 = B. */
/* Because the buffering routines assume 0 = white, */
/* we complement all the color components. */

/* Send the page to the printer.  For speed, compress each scan line, */
/* since computer-to-printer communication time is often a bottleneck. */
/* The DeskJet Color can compress (mode 2) */

private int
djet500c_print_page(gx_device_printer *pdev, FILE *fprn)
{
    byte *bitData=NULL;
    byte *plane1=NULL;
    byte *plane2=NULL;
    byte *plane3=NULL;
    int bitSize=0;
    int planeSize=0;

    /* select the most compressed mode available & clear tmp storage */
    /* put printer in known state */
    fputs("\033E",fprn);
    
    /* ends raster graphics to set raster graphics resolution */
    fputs("\033*rbC", fprn);	/*  was \033*rB  */

    /* set raster graphics resolution -- 300 dpi */
    fputs("\033*t300R", fprn);                                           
    
    /* A4, skip perf, def. paper tray */ 
    fputs("\033&l26a0l1H", fprn); 

    /* RGB Mode */
    fputs("\033*r3U", fprn);    
    
    /* set depletion level */
    fprintf(fprn, "\033*o%dD", DEPLETION);
    
    /* set shingling level */
    fprintf(fprn, "\033*o%dQ", SHINGLING);
    
    /* move to top left of page & set current position */
    fputs("\033*p0x0Y", fprn); /* cursor pos: 0,0 */
     
    fputs("\033*b2M", fprn);	/*  mode 2 compression for now  */
    
    fputs("\033*r0A", fprn);  /* start graf. left */
    
    /* Send each scan line in turn */
       {    int lnum;
	int num_blank_lines = 0;
	int lineSize = gdev_mem_bytes_per_scan_line((gx_device *)pdev);
	if (lineSize>bitSize)
	{                         
            if (bitData) free(bitData);
            bitSize=lineSize;
            bitData=(byte*)malloc(bitSize+16);
	}
	for (lnum=0; lnum<pdev->height; lnum++)
	{    
            byte *endData;
            
            gdev_prn_copy_scan_lines(pdev, lnum, bitData, lineSize);

            /* Remove trailing 0s. */
            endData = bitData + lineSize;
            while ( (endData>bitData) && (endData[-1] == 0) )
		endData--;
            if (endData == bitData)
		num_blank_lines++;
            else
            {    int count, k, i, lineLen;

		/* Pad with 0s to fill out the last */
		/* block of 8 bytes. */
		memset(endData, 0, 7);
                              
		lineLen=((endData-bitData)+7)/8;    /* Round to next 8multiple */           
		if (planeSize<lineLen)                             
		{
                    if (plane1) free(plane1);
                    if (plane2) free(plane2);
                    if (plane3) free(plane3);
                    planeSize=lineLen;
                    plane1=(byte*)malloc(planeSize+8);
                    plane2=(byte*)malloc(planeSize+8);
                    plane3=(byte*)malloc(planeSize+8);
		}
		/* Transpose the data to get pixel planes. */
		for (k=i=0; k<lineLen; i+=8, k++)
		{ 
                   register ushort t, c;
                   
                   /* Three smaller loops are better optimizable and use less
                      vars, so most of them can be in registers even on pc's */
                   for (c=t=0;t<8;t++)
			c = (c<<1) | (bitData[t+i]&4);
                   plane3[k] = ~(byte)(c>>2);
                   for (c=t=0;t<8;t++)
			c = (c<<1) | (bitData[t+i]&2);
                   plane2[k] = ~(byte)(c>>1);
                   for (c=t=0;t<8;t++)
			c = (c<<1) | (bitData[t+i]&1);
                   plane1[k] = ~(byte)(c);
		}           

		/* Skip blank lines if any */
		if (num_blank_lines > 0)
		{    /* move down from current position */
                    fprintf(fprn, "\033*b%dY", num_blank_lines);
                    num_blank_lines = 0;
		}

		/* Transfer raster graphics */
		/* in the order R, G, B. */
		/* lineLen is at least bitSize/8, so bitData can easily be used to store
                   lineLen of bytes */
		/* P.s. mode9 compression is akward(??) to use, because the lineLenght's
                   are different, so we are stuck with mode 2, which is good enough */
                   
		/* set the line width */
		fprintf(fprn, "\033*r%dS", lineLen*8);

		count = mode2compress(plane1, plane1 + lineLen, bitData);
		fprintf(fprn, "\033*b%dV", count);
		fwrite(bitData, sizeof(byte), count, fprn); 
		count = mode2compress(plane2, plane2 + lineLen, bitData);
		fprintf(fprn, "\033*b%dV", count);
		fwrite(bitData, sizeof(byte), count, fprn); 
		count = mode2compress(plane3, plane3 + lineLen, bitData);
		fprintf(fprn, "\033*b%dW", count);
		fwrite(bitData, sizeof(byte), count, fprn); 
            }
	}
    }
    /* end raster graphics */
    fputs("\033*rbC", fprn);	/*  was \033*rB  */
    fputs("\033*r1U", fprn);	/*  back to 1 plane  */

       /* put printer in known state */
    fputs("\033E",fprn);
    
    /* eject page */
    fputs("\033&l0H", fprn);        
    
    /* release allocated memory */
    if (bitData) free(bitData);
    if (plane1) free(plane1);
    if (plane2) free(plane2);
    if (plane3) free(plane3);

    return 0;
}


/*
 * Mode 2 Row compression routine for the HP DeskJet & LaserJet IIp.
 * Compresses data from row up to end_row, storing the result
 * starting at compressed.  Returns the number of bytes stored.
 * Runs of K<=127 literal bytes are encoded as K-1 followed by
 * the bytes; runs of 2<=K<=127 identical bytes are encoded as
 * 257-K followed by the byte.
 * In the worst case, the result is N+(N/127)+1 bytes long,
 * where N is the original byte count (end_row - row).
 * I can't use the general pcl version, because it assume even linelength's
 */

static int
mode2compress(byte *row, byte *end_row, byte *compressed)
{    
    register byte *exam; /* word being examined in the row to compress */
    register byte *cptr = compressed; /* output pointer into compressed bytes */
    int i, count, len;
    byte test;

    exam = row;
    while (1)
    {                        
	test = *exam++;
	/* Advance exam until test==*exam  or exam==end_row */
	while ((test != *exam) && (exam < end_row))
            test = *exam++;                    
	/* row points to start of differing bytes,
           exam points to start of consequtive series 
                    or to end of row */
	if (exam<end_row) exam--;
	len=exam-row;   
	while (len>0)
	{
            count=len;
            if (count>127) count=127;
            *cptr++=count-1;  
            for (i=0;i<count;i++) *cptr++ = *row++;
            len-=count;
	}     
	if (exam>=end_row) break;     /* done */             
	exam++;     /* skip first same byte */
	while ((test == *exam) && (exam < end_row))  /* skip all same bytes */
            exam++;
	/* exam points now first different word or to end of data */
	len = exam-row;
	while (len>0)
	{     
            count=len;
            if (count>127) count=127;
            *cptr++=(257-count);
            *cptr++=test;             
            len-=count;
	}                
	if (exam>=end_row) break;            /* end of data */
	row = exam;    /* row points to first dissimular byte */
    }                                          
    return (cptr-compressed);
}
