/* Copyright (C) 1995, 2000 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: gdevtfnx.c,v 1.7 2002/02/21 22:24:52 giles Exp $ */
/* 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 const 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 const 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);

const gx_device_printer 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)
};

const gx_device_printer 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 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 ------ */

private int
tiff12_print_page(gx_device_printer * pdev, FILE * file)
{
    gx_device_tiff *const tfdev = (gx_device_tiff *)pdev;
    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), 0);
    if (code < 0)
	return code;

    /* Write the page data. */
    {
	int y;
	int raster = gdev_prn_raster(pdev);
	byte *line = gs_alloc_bytes(pdev->memory, raster, "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, (pdev->width * 3 + 1) >> 1, file);
	}

	gdev_tiff_end_strip(&tfdev->tiff, file);
	gdev_tiff_end_page(&tfdev->tiff, file);
	gs_free_object(pdev->memory, line, "tiff12_print_page");
    }

    return code;
}

private int
tiff24_print_page(gx_device_printer * pdev, FILE * file)
{
    gx_device_tiff *const tfdev = (gx_device_tiff *)pdev;
    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), 0);
    if (code < 0)
	return code;

    /* Write the page data. */
    {
	int y;
	int raster = gdev_prn_raster(pdev);
	byte *line = gs_alloc_bytes(pdev->memory, raster, "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_strip(&tfdev->tiff, file);
	gdev_tiff_end_page(&tfdev->tiff, file);
	gs_free_object(pdev->memory, line, "tiff24_print_page");
    }

    return code;
}