bayer.cpp

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/*
 * 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++;
    }
}