/*
 * BAYER2RGB24 ROUTINE TAKEN FROM:
 *
 * Sonix SN9C101 based webcam basic I/F routines
 * Copyright (C) 2004 Takafumi Mizuno <taka-qce@ls-a.jp>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

void bayer2rgb24(unsigned char *dst, unsigned char *src, long int WIDTH, long int HEIGHT)
{
	long int i;
	unsigned char *rawpt, *scanpt;
	long int size;

	rawpt = src;
	scanpt = dst;
	size = WIDTH*HEIGHT;

	for ( i = 0; i < size; i++ )
	{
		if ( (i/WIDTH) % 2 == 0 )
		{
			if ( (i % 2) == 0 )
			{
				// B
				if ( (i > WIDTH) && ((i % WIDTH) > 0) )
				{
					*scanpt++ = (*(rawpt-WIDTH-1)+*(rawpt-WIDTH+1)+*(rawpt+WIDTH-1)+*(rawpt+WIDTH+1))/4;	// R
					*scanpt++ = (*(rawpt-1)+*(rawpt+1)+*(rawpt+WIDTH)+*(rawpt-WIDTH))/4;			// G
					*scanpt++ = *rawpt;									// B
				}
				else
				{
					// first line or left column
					*scanpt++ = *(rawpt+WIDTH+1);			// R
					*scanpt++ = (*(rawpt+1)+*(rawpt+WIDTH))/2;	// G
					*scanpt++ = *rawpt;				// B
				}
			}
			else
			{
				// (B)G
				if ( (i > WIDTH) && ((i % WIDTH) < (WIDTH-1)) )
				{
					*scanpt++ = (*(rawpt+WIDTH)+*(rawpt-WIDTH))/2;	// R
					*scanpt++ = *rawpt;				// G
					*scanpt++ = (*(rawpt-1)+*(rawpt+1))/2;		// B
				}
				else
				{
					// first line or right column
					*scanpt++ = *(rawpt+WIDTH);	// R
					*scanpt++ = *rawpt;		// G
					*scanpt++ = *(rawpt-1);		// B
				}
			}
		}
		else
		{
			if ( (i % 2) == 0 )
			{
				// G(R)
				if ( (i < (WIDTH*(HEIGHT-1))) && ((i % WIDTH) > 0) )
				{
					*scanpt++ = (*(rawpt-1)+*(rawpt+1))/2;		// R
					*scanpt++ = *rawpt;				// G
					*scanpt++ = (*(rawpt+WIDTH)+*(rawpt-WIDTH))/2;	// B
				}
				else
				{
					// bottom line or left column
					*scanpt++ = *(rawpt+1);		/* R */
					*scanpt++ = *rawpt;			/* G */
					*scanpt++ = *(rawpt-WIDTH);		/* B */
				}
			}
			else
			{
				// R
				if ( i < (WIDTH*(HEIGHT-1)) && ((i % WIDTH) < (WIDTH-1)) )
				{
					*scanpt++ = *rawpt;									// R
					*scanpt++ = (*(rawpt-1)+*(rawpt+1)+*(rawpt-WIDTH)+*(rawpt+WIDTH))/4;			// G
					*scanpt++ = (*(rawpt-WIDTH-1)+*(rawpt-WIDTH+1)+*(rawpt+WIDTH-1)+*(rawpt+WIDTH+1))/4;	// B
				}
				else
				{
					// bottom line or right column
					*scanpt++ = *rawpt;				/* R */
					*scanpt++ = (*(rawpt-1)+*(rawpt-WIDTH))/2;	/* G */
					*scanpt++ = *(rawpt-WIDTH-1);		/* B */
				}
			}
		}
		rawpt++;
	}
}