Unfolding loops and branching, optimization 3

unfold-add-switch.c

for (xx = 0; xx < imOut->xsize; xx++) {
    if (imIn->bands == 4) {
        // Body, 4-band images
    } else if (imIn->bands == 3) {
        ss0 = 0.0;
        ss1 = 0.0;
        ss2 = 0.0;
        for (x = (int) xmin; x < (int) xmax; x++) {
            ss0 = ss0 + (UINT8) imIn->image[yy][x*4+0] * k[x - (int) xmin];
            ss1 = ss1 + (UINT8) imIn->image[yy][x*4+1] * k[x - (int) xmin];
            ss2 = ss2 + (UINT8) imIn->image[yy][x*4+2] * k[x - (int) xmin];
        }
        ss0 = ss0 * ww + 0.5;
        ss1 = ss1 * ww + 0.5;
        ss2 = ss2 * ww + 0.5;
        imOut->image[yy][xx*4+0] = clip8(ss0);
        imOut->image[yy][xx*4+1] = clip8(ss1);
        imOut->image[yy][xx*4+2] = clip8(ss2);
    } else {
        // Body, 1- and 2-band images
    }
}