Here are five possible code completions for the given function:

**Option 1: Simple Row Copy**
```c
rows[nrows++] = br + bpr*sy;
if (nrows >= 256) break;
}
while (nrows--) {
    memcpy(row, rows[nrows], bpr);
    row += bpr;
}
```

**Option 2: Resampling with Interpolation**
```c
rows[nrows++] = br + bpr*sy;
if (nrows >= 256) break;
}
while (nrows--) {
    for (int i = 0; i < bpr; i++) {
        row[i] = (rows[nrows][i] + rows[nrows][i+1]) / 2;
    }
    row += bpr;
}
```

**Option 3: Resampling with Averaging**
```c
rows[nrows++] = br + bpr*sy;
if (nrows >= 256) break;
}
while (nrows--) {
    for (int i = 0; i < bpr; i++) {
        uint32 sum = 0;
        for (int j = 0; j < nrows; j++) {
            sum += rows[j][i];
        }
        row[i] = sum / nrows;
    }
    row += bpr;
}
```

**Option 4: Resampling with Bilinear Interpolation**
```c
rows[nrows++] = br + bpr*sy;
if (nrows >= 256) break;
}
while (nrows--) {
    for (int i = 0; i < bpr; i++) {
        uint32 x = i * (bpr - 1) / (tnw - 1);
        uint32 y = sy * (rh - 1) / (tnh - 1);
        uint32 x1 = x;
        uint32 y1 = y;
        uint32 x2 = x + 1;
        uint32 y2 = y + 1;
        uint32 q11 = rows[nrows][x1 + bpr*y1];
        uint32 q12 = rows[nrows][x2 + bpr*y1];
        uint32 q21 = rows[nrows][x1 + bpr*y2];
        uint32 q22 = rows[nrows][x2 + bpr*y2];
        row[i] = (q11 * (x2 - x) * (y2 - y) +
                  q21 * (x - x1) * (y2 - y) +
                  q12 * (x2 - x) * (y - y1) +
                  q22 * (x - x1) * (y - y1)) /
                 ((x2 - x1) * (y2 - y1));
    }
    row += bpr;
}
```

**Option 5: Resampling with Lanczos Filter**
```c
rows[nrows++] = br + bpr*sy;
if (nrows >= 256) break;
}
while (nrows--) {
    for (int i = 0; i < bpr; i++) {
        uint32 sum = 0;
        for (int j = -3; j <= 3; j++) {
            int x = i + j;
            if (x < 0 || x >= bpr) continue;
            sum += rows[nrows][x] * lanczos(j);
        }
        row[i] = sum;
    }
    row += bpr;
}
```

Note that these are just examples and may need to be adapted to the specific requirements of your application. Additionally, some of these options may require additional functions or data structures (e.g., the `lanczos` function in Option 5).