示例#1
0
        public override void LoadRaw()
        {
            ushort[,] vpred = new ushort[2, 2];
            ushort[] hpred = new ushort[2];
            ushort   csize;
            int      step  = 0;
            int      huff  = 0;
            int      split = 0;
            int      row;

            RawStream ifp = state.ifp;

            ifp.Seek(state.meta_offset, SeekOrigin.Begin);
            ushort ver0 = (ushort)ifp.ReadByte();
            ushort ver1 = (ushort)ifp.ReadByte();

            if (ver0 == 0x49 || ver1 == 0x58)
            {
                ifp.Seek(2110, SeekOrigin.Current);
            }

            if (ver0 == 0x46)
            {
                huff = 2;
            }
            if (state.tiff_bps == 14)
            {
                huff += 3;
            }

            vpred[0, 0] = ifp.get2();
            vpred[0, 1] = ifp.get2();
            vpred[1, 0] = ifp.get2();
            vpred[1, 1] = ifp.get2();

            int max = 1 << state.tiff_bps & 0x7fff;

            if ((csize = ifp.get2()) > 1)
            {
                step = max / (csize - 1);
            }
            if (ver0 == 0x44 && ver1 == 0x20 && step > 0)
            {
                int i;
                for (i = 0; i < csize; i++)
                {
                    state.curve[i * step] = ifp.get2();
                }

                for (i = 0; i < max; i++)
                {
                    state.curve[i] = (ushort)((state.curve[i - i % step] * (step - i % step) + state.curve[i - i % step + step] * (i % step)) / step);
                }

                ifp.Seek(state.meta_offset + 562, SeekOrigin.Begin);
                split = ifp.get2();
            }
            else if (ver0 != 0x46 && csize <= 0x4001)
            {
                max = csize;
                ifp.ReadShorts(state.curve, max);
            }

            int         tempIdx = 0;
            HuffmanTree htree   = new HuffmanTree(nikon_tree[huff], ref tempIdx);

            ifp.Seek(state.data_offset, SeekOrigin.Begin);
            ifp.ResetBits();

            for (row = 0; row < state.height; row++)
            {
                if (split != 0 && row == split)
                {
                    tempIdx = 0;
                    htree   = new HuffmanTree(nikon_tree[huff], ref tempIdx);
                }

                for (int col = 0; col < state.raw_width; col++)
                {
                    int leaf = htree.ReadNextSymbolLength(ifp);
                    int len  = leaf & 15;
                    int shl  = leaf >> 4;
                    int diff = (((int)ifp.GetBits(len - shl) << 1) + 1) << shl >> 1;
                    if ((diff & (1 << (len - 1))) == 0)
                    {
                        diff -= (1 << len) - (shl == 0 ? 1 : 0);
                    }

                    if (col < 2)
                    {
                        vpred[row & 1, col] = (ushort)(vpred[row & 1, col] + diff);
                        hpred[col]          = vpred[row & 1, col];
                    }
                    else
                    {
                        hpred[col & 1] = (ushort)(hpred[col & 1] + diff);
                    }

                    if (hpred[col & 1] >= max)
                    {
                        throw new Exception("derror()");
                    }

                    if ((uint)(col - state.left_margin) < state.width)
                    {
                        state.BAYER_set(row, col - state.left_margin, state.curve[hpred[col & 1] & 0x3fff]);
                    }
                }
            }
        }