CSJ2K.j2k.image.output.ImgWriterPPM.write C# (CSharp) Method

        public override void write(int ulx, int uly, int w, int h)
        {
            int k, j, i, c;
            // In local variables for faster access
            int fracbits;
            // variables used during coeff saturation
            int shift, tmp, maxVal;
            int tOffx, tOffy; // Active tile offset in the X and Y direction

            // Active tiles in all components have same offset since they are at
            // same resolution (PPM does not support anything else)
            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
            tOffx = src.getCompULX(cps[0]) - (int) System.Math.Ceiling(src.ImgULX / (double) src.getCompSubsX(cps[0]));
            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
            tOffy = src.getCompULY(cps[0]) - (int) System.Math.Ceiling(src.ImgULY / (double) src.getCompSubsY(cps[0]));

            // Check the array size
            if (db.data_array != null && db.data_array.Length < w)
            {
                // A new one will be allocated by getInternCompData()
                db.data_array = null;
            }

            // Check the line buffer
            if (buf == null || buf.Length < 3 * w)
            {
                buf = new byte[3 * w];
            }

            // Write the data to the file
            // Write line by line
            for (i = 0; i < h; i++)
            {
                // Write into buffer first loop over the three components and
                // write for each
                for (c = 0; c < 3; c++)
                {
                    maxVal = (1 << src.getNomRangeBits(cps[c])) - 1;
                    shift = levShift[c];

                    // Initialize db
                    db.ulx = ulx;
                    db.uly = uly + i;
                    db.w = w;
                    db.h = 1;

                    // Request the data and make sure it is not progressive
                    do
                    {
                        db = (DataBlkInt) src.getInternCompData(db, cps[c]);
                    }
                    while (db.progressive);
                    // Get the fracbits value
                    fracbits = fb[c];
                    // Write all bytes in the line
                    if (fracbits == 0)
                    {
                        for (k = db.offset + w - 1, j = 3 * w - 1 + c - 2; j >= 0; k--)
                        {
                            tmp = db.data_array[k] + shift;
                            buf[j] = (byte) ((tmp < 0)?0:((tmp > maxVal)?maxVal:tmp));
                            j -= 3;
                        }
                    }
                    else
                    {
                        for (k = db.offset + w - 1, j = 3 * w - 1 + c - 2; j >= 0; k--)
                        {
                            tmp = (SupportClass.URShift(db.data_array[k], fracbits)) + shift;
                            buf[j] = (byte) ((tmp < 0)?0:((tmp > maxVal)?maxVal:tmp));
                            j -= 3;
                        }
                    }
                }
                // Write buffer into file
                out_Renamed.Seek(offset + 3 * (this.w * (uly + tOffy + i) + ulx + tOffx), System.IO.SeekOrigin.Begin);
                out_Renamed.Write(buf, 0, 3 * w);
            }
        }