/* Copyright (C) 2001-2006 artofcode LLC.
   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 that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: gdevsgi.c 6651 2006-03-13 16:18:19Z stefan $*/
/* SGI raster file driver */
#include "gdevprn.h"
#include "gdevsgi.h"

#define X_DPI 72
#define Y_DPI 72

#define sgi_prn_device(procs, dev_name, num_comp, depth, max_gray, max_color, print_page)\
{prn_device_body(gx_device_printer, procs, dev_name, \
		 DEFAULT_WIDTH_10THS, DEFAULT_HEIGHT_10THS, X_DPI, Y_DPI, \
		 0, 0, 0, 0, \
		 num_comp, depth, max_gray, max_color, max_gray+1, max_color+1, \
		 print_page)}

private dev_proc_map_rgb_color(sgi_map_rgb_color);
private dev_proc_map_color_rgb(sgi_map_color_rgb);

private dev_proc_print_page(sgi_print_page);

private gx_device_procs sgi_procs =
  prn_color_procs(gdev_prn_open, gdev_prn_output_page, gdev_prn_close,
		  sgi_map_rgb_color, sgi_map_color_rgb);

const gx_device_printer far_data gs_sgirgb_device =
  sgi_prn_device(sgi_procs, "sgirgb", 3, 24, 255, 255, sgi_print_page);

private gx_color_index
sgi_map_rgb_color(gx_device * dev, const ushort cv[])
{      ushort bitspercolor = dev->color_info.depth / 3;
       ulong max_value = (1 << bitspercolor) - 1;
       ushort red, green, blue;
       red = cv[0]; green = cv[1]; blue = cv[2];

       return ((red*max_value / gx_max_color_value) << (bitspercolor * 2)) +
	      ((green*max_value / gx_max_color_value) << bitspercolor) +
	      (blue*max_value / gx_max_color_value);
}

private int
sgi_map_color_rgb(gx_device *dev, gx_color_index color, ushort prgb[3])
{	ushort bitspercolor = dev->color_info.depth / 3;
	ushort colormask = (1 << bitspercolor) - 1;

	prgb[0] = (ushort)(((color >> (bitspercolor * 2)) & colormask) *
		(ulong)gx_max_color_value / colormask);
	prgb[1] = (ushort)(((color >> bitspercolor) & colormask) *
		(ulong)gx_max_color_value / colormask);
	prgb[2] = (ushort)((color & colormask) *
		(ulong)gx_max_color_value / colormask);
	return 0;
}

typedef struct sgi_cursor_s {
  gx_device_printer *dev;
  int bpp;
  uint line_size;
  byte *data;
  int lnum;
} sgi_cursor;

private int
sgi_begin_page(gx_device_printer *bdev, FILE *pstream, sgi_cursor *pcur)
{
     uint line_size = gdev_mem_bytes_per_scan_line((gx_device_printer*)bdev);
     byte *data = (byte*)gs_malloc(bdev->memory, line_size, 1, "sgi_begin_page");
     IMAGE *header= (IMAGE*)gs_malloc(bdev->memory, sizeof(IMAGE),1,"sgi_begin_page");
     char filler= '\0';
     int i;

     if ((data == (byte*)0)||(header == (IMAGE*)0)) return -1;

     bzero(header,sizeof(IMAGE));
     header->imagic = IMAGIC;
     header->type = RLE(1);
     header->dim = 3;
     header->xsize=bdev->width;
     header->ysize=bdev->height;
     header->zsize=3;
     header->min_color  = 0;
     header->max_color  = bdev->color_info.max_color;
     header->wastebytes = 0;
     strncpy(header->name,"gs picture",80);
     header->colormap = CM_NORMAL;
     header->dorev=0;
     fwrite(header,sizeof(IMAGE),1,pstream);
     for (i=0; i<512-sizeof(IMAGE); i++) fputc(filler,pstream);
     pcur->dev = bdev;
     pcur->bpp = bdev->color_info.depth;
     pcur->line_size = line_size;
     pcur->data = data;
     return 0;
}

private int
sgi_next_row(sgi_cursor *pcur)
{    if (pcur->lnum < 0)
       return 1;
     gdev_prn_copy_scan_lines((gx_device_printer*)pcur->dev,
			      pcur->lnum--, pcur->data, pcur->line_size);
     return 0;
}

#define bdev ((gx_device_printer *)pdev)

private int
sgi_print_page(gx_device_printer *pdev, FILE *pstream)
{      sgi_cursor cur;
       int code = sgi_begin_page(bdev, pstream, &cur);
       uint bpe, mask;
       int separation;
       long *rowsizes=(long*)gs_malloc(pdev->memory, 4,3*bdev->height,"sgi_print_page");
       byte *edata ;
       long lastval;
       int rownumber;
#define aref2(a,b) a*bdev->height+b
       edata =  (byte*)gs_malloc(pdev->memory, cur.line_size, 1, "sgi_begin_page");
       if((code<0)||(rowsizes==(long*)NULL)||(edata==(byte*)NULL)) return(-1);
       fwrite(rowsizes,sizeof(long),3*bdev->height,pstream); /* rowstarts */
       fwrite(rowsizes,sizeof(long),3*bdev->height,pstream); /* rowsizes */
       lastval = 512+sizeof(long)*6*bdev->height;
       fseek(pstream,lastval,0);
       for (separation=0; separation < 3; separation++)
	 {
	   cur.lnum = cur.dev->height-1;
	   rownumber = 0;
	   bpe = cur.bpp/3;
	   mask = (1<<bpe) - 1;
	   while ( !(code=sgi_next_row(&cur)))
	     { byte *bp;
	       uint x;
	       int shift;
	       byte *curcol=cur.data;
	       byte *startcol=edata;
	       int count;
	       byte todo, cc;
	       byte *iptr, *sptr, *optr, *ibufend;
	       for (bp = cur.data, x=0, shift = 8 - cur.bpp;
		    x < bdev->width;
		    )
		 { ulong pixel = 0;
		   uint r, g, b;
		   switch (cur.bpp >> 3)
		     {
		     case 3: pixel = (ulong)*bp << 16; bp++;
		     case 2: pixel += (uint)*bp << 8; bp++;
		     case 1: pixel += *bp; bp++; break;
		     case 0: pixel = *bp >> shift;
		       if ((shift-=cur.bpp) < 0)
			 bp++, shift += 8; break;
		     }
		   ++x;
		   b = pixel & mask; pixel >>= bpe;
		   g = pixel & mask; pixel >>= bpe;
		   r = pixel & mask;
		   switch(separation)
		     {
		     case 0: *curcol++=r; break;
		     case 1: *curcol++=g; break;
		     case 2: *curcol++=b; break;
		     }
		 }
	       iptr=cur.data;
	       optr=startcol;
	       ibufend=curcol-1;
	       while(iptr<ibufend) {
		 sptr = iptr;						
		 iptr += 2;
		 while((iptr<ibufend)&&((iptr[-2]!=iptr[-1])||(iptr[-1]!=iptr[0])))
		   iptr++;
		 iptr -= 2;
		 count = iptr-sptr;
		 while(count) {
		   todo = count>126 ? 126:count;
		   count -= todo;
		   *optr++ = 0x80|todo;
		   while(todo--)
		     *optr++ = *sptr++;
		 }
		 sptr = iptr;
		 cc = *iptr++;
		 while( (iptr<ibufend) && (*iptr == cc) )
		   iptr++;
		 count = iptr-sptr;
		 while(count) {
		   todo = count>126 ? 126:count;
		   count -= todo;
		   *optr++ = todo;
		   *optr++ = cc;
		 }
	       }
               *optr++ = 0;
	       rowsizes[aref2(separation,rownumber++)] = optr-startcol;
	       fwrite(startcol,1,optr-startcol,pstream);
	     }
	 }
       fseek(pstream,512L,0);
       for(separation=0; separation<3; separation++)
	 for(rownumber=0; rownumber<bdev->height; rownumber++)
	   {fputc((char)(lastval>>24),pstream);
	    fputc((char)(lastval>>16),pstream);
	    fputc((char)(lastval>>8),pstream);
	    fputc((char)(lastval),pstream);
	    lastval+=rowsizes[aref2(separation,rownumber)];}
       for(separation=0; separation<3; separation++)
	 for(rownumber=0; rownumber<bdev->height; rownumber++)
	   {lastval=rowsizes[aref2(separation,rownumber)];
	    fputc((char)(lastval>>24),pstream);
	    fputc((char)(lastval>>16),pstream);
	    fputc((char)(lastval>>8),pstream);
	    fputc((char)(lastval),pstream);}
       gs_free(pdev->memory, (char*)cur.data, cur.line_size, 1,
		 "sgi_print_page(done)");
       gs_free(pdev->memory, (char*)edata, cur.line_size, 1, "sgi_print_page(done)");
       gs_free(pdev->memory, (char*)rowsizes,4,3*bdev->height,"sgi_print_page(done)");
       return (code < 0 ? code : 0);
}
