static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,

                           int bpno, int bandno, int bpass_csty_symbol,

                           int vert_causal_ctx_csty_symbol)

{

    int mask = 3 << (bpno - 1), y0, x, y;



    for (y0 = 0; y0 < height; y0 += 4)

        for (x = 0; x < width; x++)

            for (y = y0; y < height && y < y0 + 4; y++) {

                if ((t1->flags[y+1][x+1] & JPEG2000_T1_SIG_NB)

                && !(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {

                    int flags_mask = -1;

                    if (vert_causal_ctx_csty_symbol && y == y0 + 3)

                        flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE);

                    if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_jpeg2000_getsigctxno(t1->flags[y+1][x+1] & flags_mask, bandno))) {

                        int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y+1][x+1], &xorbit);

                        if (bpass_csty_symbol)

                             t1->data[y][x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask;

                        else

                             t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ?

                                               -mask : mask;



                        ff_jpeg2000_set_significance(t1, x, y,

                                                     t1->data[y][x] < 0);

                    }

                    t1->flags[y + 1][x + 1] |= JPEG2000_T1_VIS;

                }

            }

}
