src/main/java/org/jcodec/codecs/h264/decode/BlockInterpolator.java
void getLuma11Unsafe(byte[] pic, int picW, int imgH, byte[] blk, int blkOff, int blkStride, int x, int y,
            int blkW, int blkH) {
        getLuma20Unsafe(pic, picW, imgH, blk, blkOff, blkStride, x, y, blkW, blkH);
        getLuma02Unsafe(pic, picW, imgH, tmp3, 0, blkW, x, y, blkW, blkH);

        merge(blk, tmp3, blkOff, blkStride, blkW, blkH);
    }
void getLuma11Unsafe(byte[] pic, int picW, int imgH, byte[] blk, int blkOff, int blkStride, int x, int y,
            int blkW, int blkH) {
        getLuma20Unsafe(pic, picW, imgH, blk, blkOff, blkStride, x, y, blkW, blkH);
        getLuma02Unsafe(pic, picW, imgH, tmp3, 0, blkW, x, y, blkW, blkH);

        merge(blk, tmp3, blkOff, blkStride, blkW, blkH);
    }
Qpel (1, 1) unsafe