stddequantizerparams.cpp

jpeg 2000 压缩算法源代码 核心ebcot

Z_CTXT_R1)
				{
					//Apply zero coding;
				   
					if ((pBitIn->ReadBit()) != 0)
					{
						//变成有效；
					    //进行sign decoding；
					    sym = pBitIn->ReadBit();
                        // Update data
                         pData[k] = (sym<<31) | setmask;
					
						//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;

						}
	
					}
					else
					{
						csj|=STATE_VISITED_R1;

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


				//scanw the second row;
				if