/* @(#)  Generalised addition of two vasari images.
 * @(#)Inputs, outputs are neither float nor double
 * @(#) Result at each point is a*in1 + b*in2 + c
 * @(#) Result depends on inputs, rounding is carried out;
 * @(#) Function im_gaddim() assumes that the both input files
 * @(#) are either memory mapped or in a buffer.
 * @(#) Images must have the same no of bands and must not be complex
 * @(#)  No check for overflow is done;
 * @(#)
 * @(#) int im_gaddim(a, in1, b, in2, c, out)
 * @(#) double a, b, c;
 * @(#) IMAGE *in1, *in2, *out;
 * @(#)
 * @(#) Returns 0 on success and -1 on error
 * @(#)
 *
 * Copyright: 1990, N. Dessipris.
 *
 * Author: Nicos Dessipris
 * Written on: 02/05/1990
 * Modified on:
 */

/*

	This file is part of VIPS.

	VIPS is free software; you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	02110-1301  USA

 */

/*

	These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk

 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#include <vips/vips.h>
#include <vips/vips7compat.h>

/* This function works on either mmaped files or on images in buffer
 */

/*		 uchar char ushort short uint   int */
static int array[6][6] = {
	/* uchar */ { 2, 3, 2, 3, 4, 5 },
	/* char */ { 3, 3, 3, 3, 5, 5 },
	/* ushort */ { 2, 3, 2, 3, 4, 5 },
	/* short */ { 3, 3, 3, 3, 5, 5 },
	/* uint */ { 4, 5, 4, 5, 4, 5 },
	/* int */ { 5, 5, 5, 5, 5, 5 }
};

#define select_tmp2_for_out_int(OUT) \
	case IM_BANDFMT_UCHAR: \
		select_tmp1_for_out_int(unsigned char, OUT); \
		break; \
	case IM_BANDFMT_CHAR: \
		select_tmp1_for_out_int(signed char, OUT); \
		break; \
	case IM_BANDFMT_USHORT: \
		select_tmp1_for_out_int(unsigned short, OUT); \
		break; \
	case IM_BANDFMT_SHORT: \
		select_tmp1_for_out_int(signed short, OUT); \
		break; \
	case IM_BANDFMT_UINT: \
		select_tmp1_for_out_int(unsigned int, OUT); \
		break; \
	case IM_BANDFMT_INT: \
		select_tmp1_for_out_int(signed int, OUT); \
		break; \
\
	default: \
		im_error("im_gaddim", "Wrong tmp2 format(1)"); \
		free(line); \
		return -1;

#define select_tmp1_for_out_int(IN2, OUT) \
	switch (tmp1->BandFmt) { \
	case IM_BANDFMT_UINT: \
		loop(unsigned int, IN2, OUT); \
		break; \
	case IM_BANDFMT_INT: \
		loop(int, IN2, OUT); \
		break; \
	default: \
		im_error("im_gaddim", "Wrong tmp2 format(2)"); \
		free(line); \
		return -1; \
	}

#define select_tmp2_for_out_short(OUT) \
	case IM_BANDFMT_UCHAR: \
		select_tmp1_for_out_short(unsigned char, OUT); \
		break; \
	case IM_BANDFMT_CHAR: \
		select_tmp1_for_out_short(signed char, OUT); \
		break; \
	case IM_BANDFMT_USHORT: \
		select_tmp1_for_out_short(unsigned short, OUT); \
		break; \
	case IM_BANDFMT_SHORT: \
		select_tmp1_for_out_short(signed short, OUT); \
		break; \
	default: \
		g_assert(0);
#define select_tmp1_for_out_short(IN2, OUT) \
	switch (tmp1->BandFmt) { \
	case IM_BANDFMT_UCHAR: \
		loop(unsigned char, IN2, OUT); \
		break; \
	case IM_BANDFMT_CHAR: \
		loop(signed char, IN2, OUT); \
		break; \
	case IM_BANDFMT_USHORT: \
		loop(unsigned short, IN2, OUT); \
		break; \
	case IM_BANDFMT_SHORT: \
		loop(signed short, IN2, OUT); \
		break; \
	default: \
		im_error("im_gaddim", "Wrong image1 format(4)"); \
		free(line); \
		return -1; \
	}

/**
 * im_gaddim:
 *
 * Deprecated.
 */
int
im_gaddim(double a, IMAGE *in1, double b, IMAGE *in2, double c, IMAGE *out)
{
	static int fmt[] = { IM_BANDFMT_UCHAR, IM_BANDFMT_CHAR,
		IM_BANDFMT_USHORT, IM_BANDFMT_SHORT,
		IM_BANDFMT_UINT, IM_BANDFMT_INT };
	int y, x;
	int first, second, result;
	IMAGE *tmp1, *tmp2;
	PEL *line;
	int os; /* size of a line of output image */

	/* fd, data filename must have been set before the function is called
	 * Check whether they are set properly */
	if ((im_iocheck(in1, out) == -1) || (im_iocheck(in2, out) == -1)) {
		return -1;
	}
	/* Checks the arguments entered in in and prepares out */
	if ((in1->Xsize != in2->Xsize) ||
		(in1->Ysize != in2->Ysize) ||
		(in1->Bands != in2->Bands) ||
		(in1->Coding != in2->Coding)) {
		im_error("im_gaddim", " Input images differ");
		return -1;
	}
	if (in1->Coding != IM_CODING_NONE) {
		im_error("im_gaddim", " images must be uncoded");
		return -1;
	}

	switch (in1->BandFmt) {
	case IM_BANDFMT_UCHAR:
		first = 0;
		break;
	case IM_BANDFMT_CHAR:
		first = 1;
		break;
	case IM_BANDFMT_USHORT:
		first = 2;
		break;
	case IM_BANDFMT_SHORT:
		first = 3;
		break;
	case IM_BANDFMT_UINT:
		first = 4;
		break;
	case IM_BANDFMT_INT:
		first = 5;
		break;
	default:
		im_error("im_gaddim", " Unable to accept image1");
		return -1;
	}
	switch (in2->BandFmt) {
	case IM_BANDFMT_UCHAR:
		second = 0;
		break;
	case IM_BANDFMT_CHAR:
		second = 1;
		break;
	case IM_BANDFMT_USHORT:
		second = 2;
		break;
	case IM_BANDFMT_SHORT:
		second = 3;
		break;
	case IM_BANDFMT_UINT:
		second = 4;
		break;
	case IM_BANDFMT_INT:
		second = 5;
		break;
	default:
		im_error("im_gaddim", " Unable to accept image2");
		return -1;
	}
	/* Define the output */
	result = array[first][second];

	/* Prepare the output header */
	if (im_cp_desc(out, in1) == -1) {
		im_error("im_gaddim", " im_cp_desc failed");
		return -1;
	}
	out->BandFmt = fmt[result];

	if (im_setupout(out) == -1) {
		im_error("im_gaddim", " im_setupout failed");
		return -1;
	}

	/* Order in1 and in2 */
	if (first >= second) {
		tmp1 = in1;
		tmp2 = in2;
	}
	else {
		tmp1 = in2;
		tmp2 = in1;
	}

	/* Define what we do for each band element type. */

#define loop(IN1, IN2, OUT) \
	{ \
		IN1 *input1 = (IN1 *) tmp1->data; \
		IN2 *input2 = (IN2 *) tmp2->data; \
\
		for (y = 0; y < out->Ysize; y++) { \
			OUT *cpline = (OUT *) line; \
			for (x = 0; x < os; x++) \
				*cpline++ = \
					(OUT) (a * (*input1++) + b * (*input2++) + c + 0.5); \
			if (im_writeline(y, out, line) == -1) { \
				free(line); \
				return -1; \
			} \
		} \
	}

	os = out->Xsize * out->Bands;
	line = (PEL *) calloc((unsigned) os, sizeof(double));
	if (line == NULL) {
		im_error("im_gaddim", " Unable to calloc");
		return -1;
	}

	switch (out->BandFmt) {
	case IM_BANDFMT_INT:
		switch (tmp2->BandFmt) {
			select_tmp2_for_out_int(int);
		}
		break;

	case IM_BANDFMT_UINT:
		switch (tmp2->BandFmt) {
			select_tmp2_for_out_int(unsigned int);
		}
		break;
	case IM_BANDFMT_SHORT:
		switch (tmp2->BandFmt) {
			select_tmp2_for_out_short(short);
		}
		break;
	case IM_BANDFMT_USHORT:
		switch (tmp2->BandFmt) {
			select_tmp2_for_out_short(unsigned short);
		}
		break;
	default:
		im_error("im_gaddim", " Impossible output state");
		free(line);
		return -1;
	}

	free(line);

	return 0;
}
