}
void vp9_init_dsmotion_compensation(MACROBLOCK *x, int stride) {
- int len;
- int search_site_count = 0;
+ int len, ss_count = 1;
- // Generate offsets for 4 search sites per step.
- x->ss[search_site_count].mv.col = 0;
- x->ss[search_site_count].mv.row = 0;
- x->ss[search_site_count].offset = 0;
- search_site_count++;
+ x->ss[0].mv.col = x->ss[0].mv.row = 0;
+ x->ss[0].offset = 0;
for (len = MAX_FIRST_STEP; len > 0; len /= 2) {
- // Compute offsets for search sites.
- x->ss[search_site_count].mv.col = 0;
- x->ss[search_site_count].mv.row = -len;
- x->ss[search_site_count].offset = -len * stride;
- search_site_count++;
-
- // Compute offsets for search sites.
- x->ss[search_site_count].mv.col = 0;
- x->ss[search_site_count].mv.row = len;
- x->ss[search_site_count].offset = len * stride;
- search_site_count++;
-
- // Compute offsets for search sites.
- x->ss[search_site_count].mv.col = -len;
- x->ss[search_site_count].mv.row = 0;
- x->ss[search_site_count].offset = -len;
- search_site_count++;
-
- // Compute offsets for search sites.
- x->ss[search_site_count].mv.col = len;
- x->ss[search_site_count].mv.row = 0;
- x->ss[search_site_count].offset = len;
- search_site_count++;
+ // Generate offsets for 4 search sites per step.
+ const MV ss_mvs[] = {{-len, 0}, {len, 0}, {0, -len}, {0, len}};
+ int i;
+ for (i = 0; i < 4; ++i) {
+ search_site *const ss = &x->ss[ss_count++];
+ ss->mv = ss_mvs[i];
+ ss->offset = ss->mv.row * stride + ss->mv.col;
+ }
}
- x->ss_count = search_site_count;
+ x->ss_count = ss_count;
x->searches_per_step = 4;
}