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/*
   In order to inline this calculation, I make the risky
   assumption that all filter patterns can be described
   by a repeating pattern of eight rows and two columns

   Return values are either 0/1/2/3 = G/M/C/Y or 0/1/2/3 = R/G1/B/G2
 */
#define FC(row,col) \
    (filters >> ((((row) << 1 & 14) + ((col) & 1)) << 1) & 3)

#define BAYER(row,col) \
    image[((row) >> shrink)*iwidth + ((col) >> shrink)][FC(row,col)]

/*
    PowerShot 600   PowerShot A50   PowerShot Pro70 Pro90 & G1
    0xe1e4e1e4: 0x1b4e4b1e: 0x1e4b4e1b: 0xb4b4b4b4:

      0 1 2 3 4 5     0 1 2 3 4 5     0 1 2 3 4 5     0 1 2 3 4 5
    0 G M G M G M   0 C Y C Y C Y   0 Y C Y C Y C   0 G M G M G M
    1 C Y C Y C Y   1 M G M G M G   1 M G M G M G   1 Y C Y C Y C
    2 M G M G M G   2 Y C Y C Y C   2 C Y C Y C Y
    3 C Y C Y C Y   3 G M G M G M   3 G M G M G M
            4 C Y C Y C Y   4 Y C Y C Y C
    PowerShot A5    5 G M G M G M   5 G M G M G M
    0x1e4e1e4e: 6 Y C Y C Y C   6 C Y C Y C Y
            7 M G M G M G   7 M G M G M G
      0 1 2 3 4 5
    0 C Y C Y C Y
    1 G M G M G M
    2 C Y C Y C Y
    3 M G M G M G

   All RGB cameras use one of these Bayer grids:

    0x16161616: 0x61616161: 0x49494949: 0x94949494:

      0 1 2 3 4 5     0 1 2 3 4 5     0 1 2 3 4 5     0 1 2 3 4 5
    0 B G B G B G   0 G R G R G R   0 G B G B G B   0 R G R G R G
    1 G R G R G R   1 B G B G B G   1 R G R G R G   1 G B G B G B
    2 B G B G B G   2 G R G R G R   2 G B G B G B   2 R G R G R G
    3 G R G R G R   3 B G B G B G   3 R G R G R G   3 G B G B G B
 */