/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file \ingroup avi
 *
 * This is external code. Converts between rgb32 and avi.
 */

#include <stdlib.h>
#include <string.h>

#include "MEM_guardedalloc.h"

#include "IMB_imbuf.h"

#include "AVI_avi.h"
#include "avi_rgb32.h"

void *avi_converter_from_rgb32(AviMovie *movie, int stream, unsigned char *buffer, size_t *size)
{
	unsigned char *buf;

	(void)stream; /* unused */

	*size = (size_t)movie->header->Height * (size_t)movie->header->Width * 3;
	buf = imb_alloc_pixels(movie->header->Height, movie->header->Width, 3, sizeof(unsigned char), "fromrgb32buf");
	if (!buf) {
		return NULL;
	}

	size_t rowstridea = movie->header->Width * 3;
	size_t rowstrideb = movie->header->Width * 4;

	for (size_t y = 0; y < movie->header->Height; y++) {
		for (size_t x = 0; x < movie->header->Width; x++) {
			buf[y * rowstridea + x * 3 + 0] = buffer[y * rowstrideb + x * 4 + 3];
			buf[y * rowstridea + x * 3 + 1] = buffer[y * rowstrideb + x * 4 + 2];
			buf[y * rowstridea + x * 3 + 2] = buffer[y * rowstrideb + x * 4 + 1];
		}
	}

	MEM_freeN(buffer);

	return buf;
}

void *avi_converter_to_rgb32(AviMovie *movie, int stream, unsigned char *buffer, size_t *size)
{
	unsigned char *buf;
	unsigned char *to, *from;

	(void)stream; /* unused */

	*size = (size_t)movie->header->Height * (size_t)movie->header->Width * 4;
	buf = imb_alloc_pixels(movie->header->Height, movie->header->Width, 3, sizeof(unsigned char), "torgb32buf");
	if (!buf) {
		return NULL;
	}

	memset(buf, 255, *size);

	to = buf; from = buffer;
	size_t i = (size_t)movie->header->Height * (size_t)movie->header->Width;

	while (i--) {
		memcpy(to, from, 3);
		to += 4; from += 3;
	}

	MEM_freeN(buffer);

	return buf;
}