func: void vp8_mc_chroma(VP8Context *s, VP8ThreadData *td, uint8_t *dst1, uint8_t *dst2,
  
                     ThreadFrame *ref, const VP56mv *mv, int x_off, int y_off,
  
                     int block_w, int block_h, int width, int height, int linesize,
  
                     vp8_mc_func mc_func[3][3])
  
  {
  
      uint8_t *src1 = ref->f->data[1], *src2 = ref->f->data[2];
  
  
  
      if (AV_RN32A(mv)) {
  
          int mx = mv->x&7, mx_idx = subpel_idx[0][mx];
  
          int my = mv->y&7, my_idx = subpel_idx[0][my];
  
  
  
          x_off += mv->x >> 3;
  
          y_off += mv->y >> 3;
  
  
  
          // edge emulation
  
          src1 += y_off * linesize + x_off;
  
          src2 += y_off * linesize + x_off;
  
          ff_thread_await_progress(ref, (3 + y_off + block_h + subpel_idx[2][my]) >> 3, 0);
  
          if (x_off < mx_idx || x_off >= width  - block_w - subpel_idx[2][mx] ||
  
              y_off < my_idx || y_off >= height - block_h - subpel_idx[2][my]) {
  
              s->vdsp.emulated_edge_mc(td->edge_emu_buffer, src1 - my_idx * linesize - mx_idx, linesize,
  
                                       block_w + subpel_idx[1][mx], block_h + subpel_idx[1][my],
  
                                       x_off - mx_idx, y_off - my_idx, width, height);
  
              src1 = td->edge_emu_buffer + mx_idx + linesize * my_idx;
  
              mc_func[my_idx][mx_idx](dst1, linesize, src1, linesize, block_h, mx, my);
  
  
  
              s->vdsp.emulated_edge_mc(td->edge_emu_buffer, src2 - my_idx * linesize - mx_idx, linesize,
  
                                       block_w + subpel_idx[1][mx], block_h + subpel_idx[1][my],
  
                                       x_off - mx_idx, y_off - my_idx, width, height);
  
              src2 = td->edge_emu_buffer + mx_idx + linesize * my_idx;
  
              mc_func[my_idx][mx_idx](dst2, linesize, src2, linesize, block_h, mx, my);
  
          } else {
  
              mc_func[my_idx][mx_idx](dst1, linesize, src1, linesize, block_h, mx, my);
  
              mc_func[my_idx][mx_idx](dst2, linesize, src2, linesize, block_h, mx, my);
  
          }
  
      } else {
  
          ff_thread_await_progress(ref, (3 + y_off + block_h) >> 3, 0);
  
          mc_func[0][0](dst1, linesize, src1 + y_off * linesize + x_off, linesize, block_h, 0, 0);
  
          mc_func[0][0](dst2, linesize, src2 + y_off * linesize + x_off, linesize, block_h, 0, 0);
  
      }
  
  }
  