sample_scale     5643 contrib/libtests/pngvalid.c    that->red = sample_scale(that->redf, scale);
sample_scale     5659 contrib/libtests/pngvalid.c       that->green = sample_scale(that->greenf, scale);
sample_scale     5660 contrib/libtests/pngvalid.c       that->blue = sample_scale(that->bluef, scale);
sample_scale     5674 contrib/libtests/pngvalid.c       that->alpha = sample_scale(that->alphaf, scale);