/* Copyright (C) 1995 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.
*/

/* gdevtfnx.c */
/* 12-bit & 24-bit RGB uncompressed TIFF driver */
#include "gdevprn.h"
#include "gdevtifs.h"

/*
 * Thanks to Alan Barclay <alan@escribe.co.uk> for donating the original
 * version of this code to Ghostscript.
 */

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

/* Default X and Y resolution */
#define X_DPI 72
#define Y_DPI 72

typedef struct gx_device_tiff_s {
	gx_device_common;
	gx_prn_device_common;
	gdev_tiff_state tiff;
} gx_device_tiff;

private dev_proc_print_page(tiff12_print_page);
private dev_proc_print_page(tiff24_print_page);

private gx_device_procs tiff12_procs =
  prn_color_procs(gdev_prn_open, gdev_prn_output_page, gdev_prn_close,
		  gx_default_rgb_map_rgb_color, gx_default_rgb_map_color_rgb);
private gx_device_procs tiff24_procs =
  prn_color_procs(gdev_prn_open, gdev_prn_output_page, gdev_prn_close,
		  gx_default_rgb_map_rgb_color, gx_default_rgb_map_color_rgb);

gx_device_printer far_data gs_tiff12nc_device =
{ prn_device_std_body(gx_device_tiff, tiff12_procs, "tiff12nc",
		      DEFAULT_WIDTH_10THS, DEFAULT_HEIGHT_10THS,
		      X_DPI, Y_DPI,
		      0, 0, 0, 0,
		      24, tiff12_print_page)
};

gx_device_printer far_data gs_tiff24nc_device =
{ prn_device_std_body(gx_device_tiff, tiff24_procs, "tiff24nc",
		      DEFAULT_WIDTH_10THS, DEFAULT_HEIGHT_10THS,
		      X_DPI, Y_DPI,
		      0, 0, 0, 0,
		      24, tiff24_print_page)
};

/* ------ Private definitions ------ */

/* Define our TIFF directory - sorted by tag number */
typedef struct tiff_rgb_directory_s {
	TIFF_dir_entry	BitsPerSample;
	TIFF_dir_entry	Compression;
	TIFF_dir_entry	Photometric;
	TIFF_dir_entry	FillOrder;
	TIFF_dir_entry	SamplesPerPixel;
} tiff_rgb_directory;
typedef struct tiff_rgb_values_s {
	TIFF_ushort bps[3];
} tiff_rgb_values;

private const tiff_rgb_directory far_data dir_rgb_template = {
	/* C's ridiculous rules about & and arrays require bps[0] here: */
	{ TIFFTAG_BitsPerSample, TIFF_SHORT | TIFF_INDIRECT, 3, offset_of(tiff_rgb_values, bps[0]) },
	{ TIFFTAG_Compression,	TIFF_SHORT, 1, Compression_none },
	{ TIFFTAG_Photometric,	TIFF_SHORT, 1, Photometric_RGB },
	{ TIFFTAG_FillOrder,	TIFF_SHORT, 1, FillOrder_MSB2LSB },
	{ TIFFTAG_SamplesPerPixel, TIFF_SHORT, 1, 3 },
};

private const tiff_rgb_values val_12_template = {
	{ 4, 4, 4 }
};

private const tiff_rgb_values val_24_template = {
	{ 8, 8, 8 }
};

/* ------ Private functions ------ */

#define tfdev ((gx_device_tiff *)pdev)

private int
tiff12_print_page( gx_device_printer *pdev, FILE *file )
{	int code;

	/* Write the page directory. */
	code = gdev_tiff_begin_page(pdev, &tfdev->tiff, file,
			(const TIFF_dir_entry *)&dir_rgb_template,
			sizeof(dir_rgb_template) / sizeof(TIFF_dir_entry),
			(const byte *)&val_12_template,
			sizeof(val_12_template));
	if ( code < 0 )
	  return code;

	/* Write the page data. */
	{
		int y;
		int raster = gdev_prn_raster( pdev );
		byte *line = (byte *)gs_malloc( raster, 1, "tiff12_print_page" );
		byte *row;

		if ( line == 0 )
		  return_error( gs_error_VMerror );

		for ( y = 0; y < pdev->height; ++y )
		  {	const byte *src;
			byte *dest;
			int x;

			code = gdev_prn_get_bits( pdev, y, line, &row );
			if ( code < 0 )
			  break;

			for ( src = row, dest = line, x = 0; x < raster;
			      src += 6, dest += 3, x += 6
			    )
			  {
				dest[0] = (src[0] & 0xf0) | (src[1] >> 4);
				dest[1] = (src[2] & 0xf0) | (src[3] >> 4);
				dest[2] = (src[4] & 0xf0) | (src[5] >> 4);
			  }
			fwrite( line, 1, dest - line, file );
		  }

		gdev_tiff_end_page( &tfdev->tiff, file );
		gs_free( line, raster, 1, "tiff12_print_page" );
	}

	return code;
}

private int
tiff24_print_page(gx_device_printer *pdev, FILE *file)
{	int code;

	/* Write the page directory. */
	code = gdev_tiff_begin_page(pdev, &tfdev->tiff, file,
			(const TIFF_dir_entry *)&dir_rgb_template,
			sizeof(dir_rgb_template) / sizeof(TIFF_dir_entry),
			(const byte *)&val_24_template,
			sizeof(val_24_template));
	if ( code < 0 )
	  return code;

	/* Write the page data. */
	{ int y;
	  int raster = gdev_prn_raster(pdev);
	  byte *line = (byte *)gs_malloc(raster, 1, "tiff24_print_page");
	  byte *row;

	  if ( line == 0 )
	    return_error(gs_error_VMerror);
	  for ( y = 0; y < pdev->height; ++y )
	    { code = gdev_prn_get_bits(pdev, y, line, &row);
	      if ( code < 0 )
		break;
	      fwrite((char *)row, raster, 1, file);
	    }
	  gdev_tiff_end_page(&tfdev->tiff, file);
	  gs_free(line, raster, 1, "tiff24_print_page");
	}

	return code;
}

#undef tfdev
