SUB_PIXEL_BITS     33 libavfilter/vf_perspective.c #define SUB_PIXELS      (1 << SUB_PIXEL_BITS)
SUB_PIXEL_BITS    279 libavfilter/vf_perspective.c             u  >>= SUB_PIXEL_BITS;
SUB_PIXEL_BITS    280 libavfilter/vf_perspective.c             v  >>= SUB_PIXEL_BITS;
SUB_PIXEL_BITS    358 libavfilter/vf_perspective.c             u  >>= SUB_PIXEL_BITS;
SUB_PIXEL_BITS    359 libavfilter/vf_perspective.c             v  >>= SUB_PIXEL_BITS;
SUB_PIXEL_BITS    369 libavfilter/vf_perspective.c                     sum = (sum + (1 << (SUB_PIXEL_BITS * 2 - 1)))>> (SUB_PIXEL_BITS * 2);
SUB_PIXEL_BITS    377 libavfilter/vf_perspective.c                     sum   = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS;
SUB_PIXEL_BITS    387 libavfilter/vf_perspective.c                     sum   = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS;