/* *****************************************************************************
 * decode/mcs/picture.c -- decode an MCS picture.
 * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of libg1m.
 * libg1m 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 3.0 of the License,
 * or (at your option) any later version.
 *
 * libg1m 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 libg1m; if not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************** */
#include <libg1m/internals.h>

/**
 *	g1m_decode_mcs_capture:
 *	Decode a capture.
 *
 *	@arg	handle		the handle to make.
 *	@arg	buffer		the buffer to read from.
 *	@arg	head		the pre-filled head to complete and use.
 *	@return				the error code (0 if ok).
 */

int g1m_decode_mcs_capture(g1m_mcsfile_t **handle, g1m_buffer_t *buffer,
	g1m_mcshead_t *head)
{
	/* read header */
	DREAD(hd, mcs_captureheader)
	hd.width = be16toh(hd.width);
	hd.height = be16toh(hd.height);

	/* make final head and file */
	head->width = hd.width;
	head->height = hd.height;
	int err = g1m_make_mcsfile(handle, head);
	if (err) return (err);
	g1m_mcsfile_t *h = *handle;

	/* print info */
	log_info("capture is %dx%d sized", h->head.width, h->head.height);

	/* read raw data */
	size_t pic_size = g1m_picturesize_1bit_packed(head->width, head->height);
	uint8_t pic_raw[pic_size]; READ(pic_raw, pic_size)

	/* get the image and return */
	if ((err = g1m_decode_picture(h->pics[0], g1m_pictureformat_1bit_packed,
	  pic_raw, head->width, head->height))) {
		g1m_free_mcsfile(*handle);
		*handle = NULL;
		return (err);
	}

	/* no error! */
	return (0);
}

/**
 *	g1m_decode_mcs_picture:
 *	Decode a picture.
 *
 *	@arg	handle		the handle to make.
 *	@arg	buffer		the buffer to read from.
 *	@arg	head		the pre-filled head to complete and use.
 *	@return				the error code (0 if ok).
 */

int g1m_decode_mcs_picture(g1m_mcsfile_t **handle, g1m_buffer_t *buffer,
	g1m_mcshead_t *head)
{
	/* make final head */
	head->width = 128;
	head->height = 64;
	int err = g1m_make_mcsfile(handle, head);
	if (err) return (err);
	g1m_mcsfile_t *h = *handle;

	/* get the images */
	size_t pic_size = g1m_picturesize_1bit_packed(head->width, head->height);
	uint8_t pics_raw[pic_size * 2]; READ(pics_raw, pic_size * 2)

	/* decode the images */
	if ((err = g1m_decode_picture(h->pics[0], g1m_pictureformat_1bit_packed,
	  pics_raw, head->width, head->height))
	 || (err = g1m_decode_picture(h->pics[1], g1m_pictureformat_1bit_packed,
	  &pics_raw[pic_size], head->width, head->height))) {
		g1m_free_mcsfile(*handle);
		*handle = NULL;
		return (err);
	}

	/* no error */
	return (0);
}