C# TIFF.tif_setupencode方法代码示例

		// Reset encoding state at the start of a strip.
		static bool LZWPreEncode(TIFF tif, ushort sampleNumber)
		{
			LZWCodecState sp=tif.tif_data as LZWCodecState;

#if DEBUG
			if(sp==null) throw new Exception("sp=null");
#endif

			if(sp.enc_hashtab==null)
			{
				tif.tif_setupencode(tif);
			}

			sp.nbits=BITS_MIN;
			sp.maxcode=(ushort)MAXCODE(BITS_MIN);
			sp.free_ent=CODE_FIRST;
			sp.nextbits=0;
			sp.nextdata=0;
			sp.enc_checkpoint=LZWCodecState.CHECK_GAP;
			sp.enc_ratio=0;
			sp.enc_incount=0;
			sp.enc_outcount=0;
			
			// The 4 here insures there is space for 2 max-sized
			// codes in LZWEncode and LZWPostDecode.
			sp.enc_rawlimit=tif.tif_rawdatasize-1-4;
			cl_hash(sp);		// clear hash table
			sp.enc_oldcode=-1;	// generates CODE_CLEAR in LZWEncode
			return true;
		}

        public static int TIFFWriteScanline(TIFF tif, byte[] buf, uint row, ushort sample)
        {
            string module="TIFFWriteScanline";

            if(!((tif.tif_flags&TIF_FLAGS.TIFF_BEENWRITING)!=0||TIFFWriteCheck(tif, false, module))) return -1;

            // Handle delayed allocation of data buffer. This
            // permits it to be sized more intelligently (using
            // directory information).
            if(!BUFFERCHECK(tif)) return -1;
            TIFFDirectory td=tif.tif_dir;
            bool imagegrew=false;

            // Extend image length if needed
            // (but only for PlanarConfig=1).
            if(row>=td.td_imagelength)
            {	// extend image
                if(td.td_planarconfig==PLANARCONFIG.SEPARATE)
                {
                    TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "Can not change \"ImageLength\" when using separate planes");
                    return -1;
                }

                td.td_imagelength=row+1;
                imagegrew=true;
            }

            // Calculate strip and check for crossings.
            uint strip;
            if(td.td_planarconfig==PLANARCONFIG.SEPARATE)
            {
                if(sample>=td.td_samplesperpixel)
                {
                    TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "{0}: Sample out of range, max {1}", sample, td.td_samplesperpixel);
                    return -1;
                }
                strip=sample*td.td_stripsperimage+row/td.td_rowsperstrip;
            }
            else strip=row/td.td_rowsperstrip;

            // Check strip array to make sure there's space. We don't support
            // dynamically growing files that have data organized in separate
            // bitplanes because it's too painful. In that case we require that
            // the imagelength be set properly before the first write (so that the
            // strips array will be fully allocated above).
            if(strip>=td.td_nstrips&&!TIFFGrowStrips(tif, 1, module)) return -1;

            if(strip!=tif.tif_curstrip)
            {
                // Changing strips -- flush any data present.
                if(!TIFFFlushData(tif)) return -1;

                tif.tif_curstrip=strip;

                // Watch out for a growing image. The value of strips/image
                // will initially be 1 (since it can't be deduced until the
                // imagelength is known).
                if(strip>=td.td_stripsperimage&&imagegrew) td.td_stripsperimage=TIFFhowmany(td.td_imagelength, td.td_rowsperstrip);

                tif.tif_row=(strip%td.td_stripsperimage)*td.td_rowsperstrip;
                if((tif.tif_flags&TIF_FLAGS.TIFF_CODERSETUP)==0)
                {
                    if(!tif.tif_setupencode(tif)) return -1;
                    tif.tif_flags|=TIF_FLAGS.TIFF_CODERSETUP;
                }

                tif.tif_rawcc=0;
                tif.tif_rawcp=0;

                if(td.td_stripbytecount[strip]>0)
                {
                    // Force TIFFAppendToStrip() to consider placing data at end of file.
                    tif.tif_curoff=0;
                }

                if(!tif.tif_preencode(tif, sample)) return -1;
                tif.tif_flags|=TIF_FLAGS.TIFF_POSTENCODE;
            }

            // Ensure the write is either sequential or at the
            // beginning of a strip (or that we can randomly
            // access the data -- i.e. no encoding).
            if(row!=tif.tif_row)
            {
                if(row<tif.tif_row)
                {
                    // Moving backwards within the same strip:
                    // backup to the start and then decode
                    // forward (below).
                    tif.tif_row=(strip%td.td_stripsperimage)*td.td_rowsperstrip;
                    tif.tif_rawcp=0;
                }

                // Seek forward to the desired row.
                if(!tif.tif_seek(tif, row-tif.tif_row)) return -1;
                tif.tif_row=row;
            }

            // swab if needed - note that source buffer will be altered
            tif.tif_postdecode(tif, buf, 0, (int)tif.tif_scanlinesize);
//.........这里部分代码省略.........

        // Encode the supplied data and write it to the
        // specified strip.
        //
        // NB: Image length must be setup before writing.
        public static int TIFFWriteEncodedStrip(TIFF tif, uint strip, byte[] data, int cc)
        {
            string module="TIFFWriteEncodedStrip";
            TIFFDirectory td=tif.tif_dir;
            ushort sample;

            if(!((tif.tif_flags&TIF_FLAGS.TIFF_BEENWRITING)!=0||TIFFWriteCheck(tif, false, module))) return -1;

            // Check strip array to make sure there's space.
            // We don't support dynamically growing files that
            // have data organized in separate bitplanes because
            // it's too painful. In that case we require that
            // the imagelength be set properly before the first
            // write (so that the strips array will be fully
            // allocated above).
            ///
            if(strip>=td.td_nstrips)
            {
                if(td.td_planarconfig==PLANARCONFIG.SEPARATE)
                {
                    TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "Can not grow image by strips when using separate planes");
                    return -1;
                }

                if(!TIFFGrowStrips(tif, 1, module)) return -1;
                td.td_stripsperimage=TIFFhowmany(td.td_imagelength, td.td_rowsperstrip);
            }

            // Handle delayed allocation of data buffer. This
            // permits it to be sized according to the directory
            // info.
            if(!BUFFERCHECK(tif)) return -1;

            tif.tif_curstrip=strip;
            tif.tif_row=(strip%td.td_stripsperimage)*td.td_rowsperstrip;
            if((tif.tif_flags&TIF_FLAGS.TIFF_CODERSETUP)==0)
            {
                if(!tif.tif_setupencode(tif)) return -1;
                tif.tif_flags|=TIF_FLAGS.TIFF_CODERSETUP;
            }

            tif.tif_rawcc=0;
            tif.tif_rawcp=0;

            if(td.td_stripbytecount[strip]>0)
            {
                // Force TIFFAppendToStrip() to consider placing data at end of file.
                tif.tif_curoff=0;
            }

            tif.tif_flags&=~TIF_FLAGS.TIFF_POSTENCODE;
            sample=(ushort)(strip/td.td_stripsperimage);
            if(!tif.tif_preencode(tif, sample)) return -1;

            // swab if needed - note that source buffer will be altered
            tif.tif_postdecode(tif, data, 0, cc);

            if(!tif.tif_encodestrip(tif, data, cc, sample)) return 0;
            if(!tif.tif_postencode(tif)) return -1;
            if(!isFillOrder(tif, td.td_fillorder)&&(tif.tif_flags&TIF_FLAGS.TIFF_NOBITREV)==0) TIFFReverseBits(tif.tif_rawdata, tif.tif_rawcc);
            if(tif.tif_rawcc>0&&!TIFFAppendToStrip(tif, strip, tif.tif_rawdata, tif.tif_rawcc)) return -1;

            tif.tif_rawcc=0;
            tif.tif_rawcp=0;

            return cc;
        }

        // Encode the supplied data and write it to the
        // specified tile. There must be space for the
        // data. The function clamps individual writes
        // to a tile to the tile size, but does not (and
        // can not) check that multiple writes to the same
        // tile do not write more than tile size data.
        //
        // NB:	Image length must be setup before writing; this
        //        interface does not support automatically growing
        //        the image on each write (as TIFFWriteScanline does).
        public static int TIFFWriteEncodedTile(TIFF tif, uint tile, byte[] data, int cc)
        {
            string module="TIFFWriteEncodedTile";
            ushort sample;

            if(!((tif.tif_flags&TIF_FLAGS.TIFF_BEENWRITING)!=0||TIFFWriteCheck(tif, true, module))) return -1;
            TIFFDirectory td=tif.tif_dir;
            if(tile>=td.td_nstrips)
            {
                TIFFErrorExt(tif.tif_clientdata, module, "{0}: Tile {1} out of range, max {2}", tif.tif_name, tile, td.td_nstrips);
                return -1;
            }

            // Handle delayed allocation of data buffer. This
            // permits it to be sized more intelligently (using
            // directory information).
            if(!BUFFERCHECK(tif)) return -1;

            tif.tif_curtile=tile;

            tif.tif_rawcc=0;
            tif.tif_rawcp=0;;

            if(td.td_stripbytecount[tile]>0)
            {
                // if we are writing over existing tiles, zero length.
                td.td_stripbytecount[tile]=0;

                // this forces TIFFAppendToStrip() to do a seek.
                tif.tif_curoff=0;
            }

            // Compute tiles per row & per column to compute
            // current row and column
            tif.tif_row=(tile%TIFFhowmany(td.td_imagelength, td.td_tilelength))*td.td_tilelength;
            tif.tif_col=(tile%TIFFhowmany(td.td_imagewidth, td.td_tilewidth))*td.td_tilewidth;

            if((tif.tif_flags&TIF_FLAGS.TIFF_CODERSETUP)==0)
            {
                if(!tif.tif_setupencode(tif)) return -1;
                tif.tif_flags|=TIF_FLAGS.TIFF_CODERSETUP;
            }

            tif.tif_flags&=~TIF_FLAGS.TIFF_POSTENCODE;
            sample=(ushort)(tile/td.td_stripsperimage);
            if(!tif.tif_preencode(tif, sample)) return -1;

            // Clamp write amount to the tile size. This is mostly
            // done so that callers can pass in some large number
            // (e.g. -1) and have the tile size used instead.
            if(cc<1||cc>tif.tif_tilesize) cc=tif.tif_tilesize;

            // swab if needed - note that source buffer will be altered
            tif.tif_postdecode(tif, data, 0, cc);

            if(!tif.tif_encodetile(tif, data, cc, sample)) return 0;
            if(!tif.tif_postencode(tif)) return -1;

            if(!isFillOrder(tif, td.td_fillorder)&&(tif.tif_flags&TIF_FLAGS.TIFF_NOBITREV)==0) TIFFReverseBits(tif.tif_rawdata, tif.tif_rawcc);

            if(tif.tif_rawcc>0&&!TIFFAppendToStrip(tif, tile, tif.tif_rawdata, tif.tif_rawcc)) return -1;

            tif.tif_rawcc=0;
            tif.tif_rawcp=0;

            return cc;
        }

        // Reset encoding state at the start of a strip.
        static bool ZIPPreEncode(TIFF tif, ushort sampleNumber)
        {
            ZIPState sp=tif.tif_data as ZIPState;

            #if DEBUG
            if(sp==null) throw new Exception("sp==null");
            #endif

            if((sp.state&ZSTATE.INIT_ENCODE)!=ZSTATE.INIT_ENCODE)
                tif.tif_setupencode(tif);

            sp.stream.out_buf=tif.tif_rawdata;
            sp.stream.next_out=0;
            sp.stream.avail_out=tif.tif_rawdatasize;
            return zlib.deflateReset(sp.stream)==zlib.Z_OK;
        }