static double (*p[])(void *, double, double) = { lum, cb, cr, alpha };
static const char *const func2_yuv_names[] = { "lum", "cb", "cr", "alpha", "p", NULL };
static const char *const func2_rgb_names[] = { "g", "b", "r", "alpha", "p", NULL };
static double (*p[])(void *, double, double) = { lum, cb, cr, alpha };
static const char *const func2_yuv_names[] = { "lum", "cb", "cr", "alpha", "p", NULL };
static const char *const func2_rgb_names[] = { "g", "b", "r", "alpha", "p", NULL };