decoderspec.h

jpeg 2000 压缩算法源代码 核心ebcot

	{
						//变成有效；
					    //进行sign coding；
						sym=pData[k]>>31;
						ctxt=SC_LUT[(csj>>SC_SHIFT_R1)&SC_MASK];
						pSymBuf[nsym]=sym^(ctxt>>SC_SPRED_SHIFT);
						pCxtBuf[nsym++]=ctxt&SC_LUT_MASK;

						//Update state information (significant state,visited bit,neighbor significant bit of neighbors,non zeor context of neighbors,sign of neighbors);
						if (!causal)
						{
							pState[j+off_ul]|=STATE_NZ_CTXT_R2|STATE_D_DR_R2;
							pState[j+off_ur]|=STATE_NZ_CTXT_R2|STATE_D_DL_R2;

						}

						//Update sign state information of neighbors;
						if (sym!=0)
						{
							csj|=STATE_SIG_R1|STATE_VISITED_R1|STATE_NZ_CTXT_R2|STATE_V_U_R2|STATE_V_U_SIGN_R2;
							if (!causal)
							{
								pState[j-sscanw]|=STATE_NZ_CTXT_R2|STATE_V_D_R2|STATE_V_D_SIGN_R2;
							}
							pState[j+1]|=STATE_NZ_CTXT_R1|STATE_NZ_CTXT_R2|STATE_H_L_R1|STATE_H_L_SIGN_R1|STATE_D_UL_R2;
							pState[j-1]|=STATE_NZ_CTXT_R1|STATE_NZ_CTXT_R2|STATE_H_R_R1|STATE_H_R_SIGN_R1|STATE_D_UR_R2;

						}
						else
						{
							csj|=STATE_SIG_R1|STATE_VISITED_R1|STATE_NZ_CTXT_R2|STATE_V_U_R2;
							if (!causal)
							{
								pState[j-sscanw]|=STATE_NZ_CTXT_R2|STATE_V_D_R2;

							}
							pState[j+1]|=STATE_NZ_CTXT_R1|STATE_NZ_CTXT_R2|STATE_H_L_R1|STATE_D_UL_R2;
							pState[j-1]|=STATE_NZ_CTXT_R1|STATE_NZ_CTXT_R2|STATE_H_R_R1|STATE_D_UR_R2;

						}
						//Update distortion;
						normval=(pData[k]>>downshift)<<upshift;
						dist+=pFS[normval&((1<<(MSE_LKP_BITS-1))-1)];

					}
					else
					{
						csj|=STATE_VISITED_R1;

					}
					
				}
				if (sheight<2)
				{
					pState[j]=csj;