예제 #1
0
        /**
         * Encodes a full image.
         * @param data the data to encode
         * @param width the image width
         * @param height the image height
         * @return the encoded image
         */
        public static byte[] Compress(byte[] data, int width, int height)
        {
            CCITTG4Encoder g4 = new CCITTG4Encoder(width);

            g4.Fax4Encode(data, 0, g4.rowbytes * height);
            return(g4.Close());
        }
예제 #2
0
        /** Reads a page from a TIFF image.
         * @param s the file source
         * @param page the page to get. The first page is 1
         * @param direct for single strip, CCITT images, generate the image
         * by direct byte copying. It's faster but may not work
         * every time
         * @return the <CODE>Image</CODE>
         */
        public static Image GetTiffImage(RandomAccessFileOrArray s, int page, bool direct)
        {
            if (page < 1)
            {
                throw new ArgumentException("The page number must be >= 1.");
            }
            TIFFDirectory dir = new TIFFDirectory(s, page - 1);

            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_TILEWIDTH))
            {
                throw new ArgumentException("Tiles are not supported.");
            }
            int compression = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);

            switch (compression)
            {
            case TIFFConstants.COMPRESSION_CCITTRLEW:
            case TIFFConstants.COMPRESSION_CCITTRLE:
            case TIFFConstants.COMPRESSION_CCITTFAX3:
            case TIFFConstants.COMPRESSION_CCITTFAX4:
                break;

            default:
                return(GetTiffImageColor(dir, s));
            }
            float rotation = 0;

            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ORIENTATION))
            {
                int rot = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ORIENTATION);
                if (rot == TIFFConstants.ORIENTATION_BOTRIGHT || rot == TIFFConstants.ORIENTATION_BOTLEFT)
                {
                    rotation = (float)Math.PI;
                }
                else if (rot == TIFFConstants.ORIENTATION_LEFTTOP || rot == TIFFConstants.ORIENTATION_LEFTBOT)
                {
                    rotation = (float)(Math.PI / 2.0);
                }
                else if (rot == TIFFConstants.ORIENTATION_RIGHTTOP || rot == TIFFConstants.ORIENTATION_RIGHTBOT)
                {
                    rotation = -(float)(Math.PI / 2.0);
                }
            }

            Image img            = null;
            long  tiffT4Options  = 0;
            long  tiffT6Options  = 0;
            int   fillOrder      = 1;
            int   h              = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
            int   w              = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
            int   dpiX           = 0;
            int   dpiY           = 0;
            float XYRatio        = 0;
            int   resolutionUnit = TIFFConstants.RESUNIT_INCH;

            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_RESOLUTIONUNIT))
            {
                resolutionUnit = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_RESOLUTIONUNIT);
            }
            dpiX = GetDpi(dir.GetField(TIFFConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
            dpiY = GetDpi(dir.GetField(TIFFConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
            if (resolutionUnit == TIFFConstants.RESUNIT_NONE)
            {
                if (dpiY != 0)
                {
                    XYRatio = (float)dpiX / (float)dpiY;
                }
                dpiX = 0;
                dpiY = 0;
            }
            int rowsStrip = h;

            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP))
            {
                rowsStrip = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
            }
            if (rowsStrip <= 0 || rowsStrip > h)
            {
                rowsStrip = h;
            }
            long[] offset = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
            long[] size   = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
            if ((size == null || (size.Length == 1 && (size[0] == 0 || size[0] + offset[0] > s.Length))) && h == rowsStrip)   // some TIFF producers are really lousy, so...
            {
                size = new long[] { s.Length - (int)offset[0] };
            }
            bool      reverse        = false;
            TIFFField fillOrderField = dir.GetField(TIFFConstants.TIFFTAG_FILLORDER);

            if (fillOrderField != null)
            {
                fillOrder = fillOrderField.GetAsInt(0);
            }
            reverse = (fillOrder == TIFFConstants.FILLORDER_LSB2MSB);
            int paramsn = 0;

            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_PHOTOMETRIC))
            {
                long photo = dir.GetFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
                if (photo == TIFFConstants.PHOTOMETRIC_MINISBLACK)
                {
                    paramsn |= Image.CCITT_BLACKIS1;
                }
            }
            int imagecomp = 0;

            switch (compression)
            {
            case TIFFConstants.COMPRESSION_CCITTRLEW:
            case TIFFConstants.COMPRESSION_CCITTRLE:
                imagecomp = Image.CCITTG3_1D;
                paramsn  |= Image.CCITT_ENCODEDBYTEALIGN | Image.CCITT_ENDOFBLOCK;
                break;

            case TIFFConstants.COMPRESSION_CCITTFAX3:
                imagecomp = Image.CCITTG3_1D;
                paramsn  |= Image.CCITT_ENDOFLINE | Image.CCITT_ENDOFBLOCK;
                TIFFField t4OptionsField = dir.GetField(TIFFConstants.TIFFTAG_GROUP3OPTIONS);
                if (t4OptionsField != null)
                {
                    tiffT4Options = t4OptionsField.GetAsLong(0);
                    if ((tiffT4Options & TIFFConstants.GROUP3OPT_2DENCODING) != 0)
                    {
                        imagecomp = Image.CCITTG3_2D;
                    }
                    if ((tiffT4Options & TIFFConstants.GROUP3OPT_FILLBITS) != 0)
                    {
                        paramsn |= Image.CCITT_ENCODEDBYTEALIGN;
                    }
                }
                break;

            case TIFFConstants.COMPRESSION_CCITTFAX4:
                imagecomp = Image.CCITTG4;
                TIFFField t6OptionsField = dir.GetField(TIFFConstants.TIFFTAG_GROUP4OPTIONS);
                if (t6OptionsField != null)
                {
                    tiffT6Options = t6OptionsField.GetAsLong(0);
                }
                break;
            }
            if (direct && rowsStrip == h)   //single strip, direct
            {
                byte[] im = new byte[(int)size[0]];
                s.Seek(offset[0]);
                s.ReadFully(im);
                img          = Image.GetInstance(w, h, false, imagecomp, paramsn, im);
                img.Inverted = true;
            }
            else
            {
                int            rowsLeft = h;
                CCITTG4Encoder g4       = new CCITTG4Encoder(w);
                for (int k = 0; k < offset.Length; ++k)
                {
                    byte[] im = new byte[(int)size[k]];
                    s.Seek(offset[k]);
                    s.ReadFully(im);
                    int            height  = Math.Min(rowsStrip, rowsLeft);
                    TIFFFaxDecoder decoder = new TIFFFaxDecoder(fillOrder, w, height);
                    byte[]         outBuf  = new byte[(w + 7) / 8 * height];
                    switch (compression)
                    {
                    case TIFFConstants.COMPRESSION_CCITTRLEW:
                    case TIFFConstants.COMPRESSION_CCITTRLE:
                        decoder.Decode1D(outBuf, im, 0, height);
                        g4.Fax4Encode(outBuf, height);
                        break;

                    case TIFFConstants.COMPRESSION_CCITTFAX3:
                        try {
                            decoder.Decode2D(outBuf, im, 0, height, tiffT4Options);
                        }
                        catch (Exception e) {
                            // let's flip the fill bits and try again...
                            tiffT4Options ^= TIFFConstants.GROUP3OPT_FILLBITS;
                            try {
                                decoder.Decode2D(outBuf, im, 0, height, tiffT4Options);
                            }
                            catch {
                                throw e;
                            }
                        }
                        g4.Fax4Encode(outBuf, height);
                        break;

                    case TIFFConstants.COMPRESSION_CCITTFAX4:
                        decoder.DecodeT6(outBuf, im, 0, height, tiffT6Options);
                        g4.Fax4Encode(outBuf, height);
                        break;
                    }
                    rowsLeft -= rowsStrip;
                }
                byte[] g4pic = g4.Close();
                img = Image.GetInstance(w, h, false, Image.CCITTG4, paramsn & Image.CCITT_BLACKIS1, g4pic);
            }
            img.SetDpi(dpiX, dpiY);
            img.XYRatio = XYRatio;
            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ICCPROFILE))
            {
                try {
                    TIFFField   fd       = dir.GetField(TIFFConstants.TIFFTAG_ICCPROFILE);
                    ICC_Profile icc_prof = ICC_Profile.GetInstance(fd.GetAsBytes());
                    if (icc_prof.NumComponents == 1)
                    {
                        img.TagICC = icc_prof;
                    }
                }
                catch {
                    //empty
                }
            }
            img.OriginalType = Image.ORIGINAL_TIFF;
            if (rotation != 0)
            {
                img.InitialRotation = rotation;
            }
            return(img);
        }
예제 #3
0
        /** Reads a page from a TIFF image.
        * @param s the file source
        * @param page the page to get. The first page is 1
        * @param direct for single strip, CCITT images, generate the image
        * by direct byte copying. It's faster but may not work
        * every time
        * @return the <CODE>Image</CODE>
        */
        public static Image GetTiffImage(RandomAccessFileOrArray s, int page, bool direct)
        {
            if (page < 1)
                throw new ArgumentException("The page number must be >= 1.");
            TIFFDirectory dir = new TIFFDirectory(s, page - 1);
            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_TILEWIDTH))
                throw new ArgumentException("Tiles are not supported.");
            int compression = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);
            switch (compression) {
                case TIFFConstants.COMPRESSION_CCITTRLEW:
                case TIFFConstants.COMPRESSION_CCITTRLE:
                case TIFFConstants.COMPRESSION_CCITTFAX3:
                case TIFFConstants.COMPRESSION_CCITTFAX4:
                    break;
                default:
                    return GetTiffImageColor(dir, s);
            }
            float rotation = 0;
            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ORIENTATION)) {
                int rot = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ORIENTATION);
                if (rot == TIFFConstants.ORIENTATION_BOTRIGHT || rot == TIFFConstants.ORIENTATION_BOTLEFT)
                    rotation = (float)Math.PI;
                else if (rot == TIFFConstants.ORIENTATION_LEFTTOP || rot == TIFFConstants.ORIENTATION_LEFTBOT)
                    rotation = (float)(Math.PI / 2.0);
                else if (rot == TIFFConstants.ORIENTATION_RIGHTTOP || rot == TIFFConstants.ORIENTATION_RIGHTBOT)
                    rotation = -(float)(Math.PI / 2.0);
            }

            Image img = null;
            long tiffT4Options = 0;
            long tiffT6Options = 0;
            int fillOrder = 1;
            int h = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
            int w = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
            int dpiX = 0;
            int dpiY = 0;
            float XYRatio = 0;
            int resolutionUnit = TIFFConstants.RESUNIT_INCH;
            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_RESOLUTIONUNIT))
                resolutionUnit = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_RESOLUTIONUNIT);
            dpiX = GetDpi(dir.GetField(TIFFConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
            dpiY = GetDpi(dir.GetField(TIFFConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
            if (resolutionUnit == TIFFConstants.RESUNIT_NONE) {
                if (dpiY != 0)
                    XYRatio = (float)dpiX / (float)dpiY;
                dpiX = 0;
                dpiY = 0;
            }
            int rowsStrip = h;
            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP))
                rowsStrip = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
            if (rowsStrip <= 0 || rowsStrip > h)
                rowsStrip = h;
            long[] offset = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
            long[] size = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
            if ((size == null || (size.Length == 1 && (size[0] == 0 || size[0] + offset[0] > s.Length))) && h == rowsStrip) { // some TIFF producers are really lousy, so...
                size = new long[]{s.Length - (int)offset[0]};
            }
            bool reverse = false;
            TIFFField fillOrderField =  dir.GetField(TIFFConstants.TIFFTAG_FILLORDER);
            if (fillOrderField != null)
                fillOrder = fillOrderField.GetAsInt(0);
            reverse = (fillOrder == TIFFConstants.FILLORDER_LSB2MSB);
            int paramsn = 0;
            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_PHOTOMETRIC)) {
                long photo = dir.GetFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
                if (photo == TIFFConstants.PHOTOMETRIC_MINISBLACK)
                    paramsn |= Image.CCITT_BLACKIS1;
            }
            int imagecomp = 0;
            switch (compression) {
                case TIFFConstants.COMPRESSION_CCITTRLEW:
                case TIFFConstants.COMPRESSION_CCITTRLE:
                    imagecomp = Image.CCITTG3_1D;
                    paramsn |= Image.CCITT_ENCODEDBYTEALIGN | Image.CCITT_ENDOFBLOCK;
                    break;
                case TIFFConstants.COMPRESSION_CCITTFAX3:
                    imagecomp = Image.CCITTG3_1D;
                    paramsn |= Image.CCITT_ENDOFLINE | Image.CCITT_ENDOFBLOCK;
                    TIFFField t4OptionsField = dir.GetField(TIFFConstants.TIFFTAG_GROUP3OPTIONS);
                    if (t4OptionsField != null) {
                        tiffT4Options = t4OptionsField.GetAsLong(0);
                    if ((tiffT4Options & TIFFConstants.GROUP3OPT_2DENCODING) != 0)
                        imagecomp = Image.CCITTG3_2D;
                    if ((tiffT4Options & TIFFConstants.GROUP3OPT_FILLBITS) != 0)
                        paramsn |= Image.CCITT_ENCODEDBYTEALIGN;
                    }
                    break;
                case TIFFConstants.COMPRESSION_CCITTFAX4:
                    imagecomp = Image.CCITTG4;
                    TIFFField t6OptionsField = dir.GetField(TIFFConstants.TIFFTAG_GROUP4OPTIONS);
                    if (t6OptionsField != null)
                        tiffT6Options = t6OptionsField.GetAsLong(0);
                    break;
            }
            if (direct && rowsStrip == h) { //single strip, direct
                byte[] im = new byte[(int)size[0]];
                s.Seek(offset[0]);
                s.ReadFully(im);
                img = Image.GetInstance(w, h, false, imagecomp, paramsn, im);
                img.Inverted = true;
            }
            else {
                int rowsLeft = h;
                CCITTG4Encoder g4 = new CCITTG4Encoder(w);
                for (int k = 0; k < offset.Length; ++k) {
                    byte[] im = new byte[(int)size[k]];
                    s.Seek(offset[k]);
                    s.ReadFully(im);
                    int height = Math.Min(rowsStrip, rowsLeft);
                    TIFFFaxDecoder decoder = new TIFFFaxDecoder(fillOrder, w, height);
                    byte[] outBuf = new byte[(w + 7) / 8 * height];
                    switch (compression) {
                        case TIFFConstants.COMPRESSION_CCITTRLEW:
                        case TIFFConstants.COMPRESSION_CCITTRLE:
                            decoder.Decode1D(outBuf, im, 0, height);
                            g4.Fax4Encode(outBuf, height);
                            break;
                        case TIFFConstants.COMPRESSION_CCITTFAX3:
                            try {
                                decoder.Decode2D(outBuf, im, 0, height, tiffT4Options);
                            }
                            catch (Exception e) {
                                // let's flip the fill bits and try again...
                                tiffT4Options ^= TIFFConstants.GROUP3OPT_FILLBITS;
                                try {
                                    decoder.Decode2D(outBuf, im, 0, height, tiffT4Options);
                                }
                                catch {
                                    throw e;
                                }
                            }
                            g4.Fax4Encode(outBuf, height);
                            break;
                        case TIFFConstants.COMPRESSION_CCITTFAX4:
                            decoder.DecodeT6(outBuf, im, 0, height, tiffT6Options);
                            g4.Fax4Encode(outBuf, height);
                            break;
                    }
                    rowsLeft -= rowsStrip;
                }
                byte[] g4pic = g4.Close();
                img = Image.GetInstance(w, h, false, Image.CCITTG4, paramsn & Image.CCITT_BLACKIS1, g4pic);
            }
            img.SetDpi(dpiX, dpiY);
            img.XYRatio = XYRatio;
            if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ICCPROFILE)) {
                try {
                    TIFFField fd = dir.GetField(TIFFConstants.TIFFTAG_ICCPROFILE);
                    ICC_Profile icc_prof = ICC_Profile.GetInstance(fd.GetAsBytes());
                    if (icc_prof.NumComponents == 1)
                        img.TagICC = icc_prof;
                }
                catch {
                    //empty
                }
            }
            img.OriginalType = Image.ORIGINAL_TIFF;
            if (rotation != 0)
                img.InitialRotation = rotation;
            return img;
        }
예제 #4
0
 /**
 * Encodes a full image.
 * @param data the data to encode
 * @param width the image width
 * @param height the image height
 * @return the encoded image
 */
 public static byte[] Compress(byte[] data, int width, int height)
 {
     CCITTG4Encoder g4 = new CCITTG4Encoder(width);
     g4.Fax4Encode(data, 0, g4.rowbytes * height);
     return g4.Close();
 }