avcodec/snowenc: correct fullpel search pattern

No real difference in quality, its a bit slower for the same dia_size as more
vectors are searched for the same dia_size

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/snowenc.c

@@ -1119,8 +1119,8 @@ static void iterative_me(SnowContext *s){
                             for(j=0; j<i; j++){
                                 dia_change |= check_block_inter(s, mb_x, mb_y, newx+4*(i-j), newy+(4*j), obmc_edged, &best_rd);
                                 dia_change |= check_block_inter(s, mb_x, mb_y, newx-4*(i-j), newy-(4*j), obmc_edged, &best_rd);
-                                dia_change |= check_block_inter(s, mb_x, mb_y, newx+4*(i-j), newy-(4*j), obmc_edged, &best_rd);
-                                dia_change |= check_block_inter(s, mb_x, mb_y, newx-4*(i-j), newy+(4*j), obmc_edged, &best_rd);
+                                dia_change |= check_block_inter(s, mb_x, mb_y, newx-(4*j), newy+4*(i-j), obmc_edged, &best_rd);
+                                dia_change |= check_block_inter(s, mb_x, mb_y, newx+(4*j), newy-4*(i-j), obmc_edged, &best_rd);
                             }
                         }
                     }while(dia_change);

tests/ref/vsynth/vsynth1-snow

@@ -1,4 +1,4 @@
-61915927233f94db766dd968e750d6a8 *tests/data/fate/vsynth1-snow.avi
-136324 tests/data/fate/vsynth1-snow.avi
-443a1fbdfea490453e790b7e99c0c8df *tests/data/fate/vsynth1-snow.out.rawvideo
-stddev:   22.77 PSNR: 20.98 MAXDIFF:  172 bytes:  7603200/  7603200
+09e7402e7a86a1b88c2470ce7b7c5479 *tests/data/fate/vsynth1-snow.avi
+136222 tests/data/fate/vsynth1-snow.avi
+1b666c20aab90bca35d45732ae6f539f *tests/data/fate/vsynth1-snow.out.rawvideo
+stddev:   22.77 PSNR: 20.98 MAXDIFF:  173 bytes:  7603200/  7603200

tests/ref/vsynth/vsynth1-snow-hpel

@@ -1,4 +1,4 @@
-a49202654daa09408565be55b2a18010 *tests/data/fate/vsynth1-snow-hpel.avi
-138684 tests/data/fate/vsynth1-snow-hpel.avi
-00a7d96a4829e4babbe496bb0d1a1cdc *tests/data/fate/vsynth1-snow-hpel.out.rawvideo
-stddev:   22.74 PSNR: 20.99 MAXDIFF:  171 bytes:  7603200/  7603200
+a7fcc538cb09bd0d9096690ebc0e12c3 *tests/data/fate/vsynth1-snow-hpel.avi
+138572 tests/data/fate/vsynth1-snow-hpel.avi
+654064845979137a336aa27cb9605f69 *tests/data/fate/vsynth1-snow-hpel.out.rawvideo
+stddev:   22.74 PSNR: 20.99 MAXDIFF:  175 bytes:  7603200/  7603200