287 #define FS_COL_COPY(_col1, _col2)                    \  argument
289     col_sums_gx2[(_col1)] = col_sums_gx2[(_col2)];   \
290     col_sums_gy2[(_col1)] = col_sums_gy2[(_col2)];   \
291     col_sums_gxgy[(_col1)] = col_sums_gxgy[(_col2)]; \
294 #define FS_COL_HALVE(_col1, _col2)                         \  argument
296     col_sums_gx2[(_col1)] = col_sums_gx2[(_col2)] * 0.5;   \
297     col_sums_gy2[(_col1)] = col_sums_gy2[(_col2)] * 0.5;   \
298     col_sums_gxgy[(_col1)] = col_sums_gxgy[(_col2)] * 0.5; \
301 #define FS_COL_DOUBLE(_col1, _col2)                      \  argument
303     col_sums_gx2[(_col1)] = col_sums_gx2[(_col2)] * 2;   \
304     col_sums_gy2[(_col1)] = col_sums_gy2[(_col2)] * 2;   \
305     col_sums_gxgy[(_col1)] = col_sums_gxgy[(_col2)] * 2; \