C# Tiff.GetFieldDefaulted方法代码示例

        public bool Copy(Tiff inImage, Tiff outImage)
        {
            int width = 0;
            FieldValue[] result = inImage.GetField(TiffTag.IMAGEWIDTH);
            if (result != null)
            {
                width = result[0].ToInt();
                outImage.SetField(TiffTag.IMAGEWIDTH, width);
            }

            int length = 0;
            result = inImage.GetField(TiffTag.IMAGELENGTH);
            if (result != null)
            {
                length = result[0].ToInt();
                outImage.SetField(TiffTag.IMAGELENGTH, length);
            }

            short bitspersample = 1;
            result = inImage.GetField(TiffTag.BITSPERSAMPLE);
            if (result != null)
            {
                bitspersample = result[0].ToShort();
                outImage.SetField(TiffTag.BITSPERSAMPLE, bitspersample);
            }

            short samplesperpixel = 1;
            result = inImage.GetField(TiffTag.SAMPLESPERPIXEL);
            if (result != null)
            {
                samplesperpixel = result[0].ToShort();
                outImage.SetField(TiffTag.SAMPLESPERPIXEL, samplesperpixel);
            }

            if (m_compression != (Compression)(-1))
                outImage.SetField(TiffTag.COMPRESSION, m_compression);
            else
            {
                result = inImage.GetField(TiffTag.COMPRESSION);
                if (result != null)
                {
                    m_compression = (Compression)result[0].ToInt();
                    outImage.SetField(TiffTag.COMPRESSION, m_compression);
                }
            }

            result = inImage.GetFieldDefaulted(TiffTag.COMPRESSION);
            Compression input_compression = (Compression)result[0].ToInt();

            result = inImage.GetFieldDefaulted(TiffTag.PHOTOMETRIC);
            Photometric input_photometric = (Photometric)result[0].ToShort();
    
            if (input_compression == Compression.JPEG)
            {
                /* Force conversion to RGB */
                inImage.SetField(TiffTag.JPEGCOLORMODE, JpegColorMode.RGB);
            }
            else if (input_photometric == Photometric.YCBCR)
            {
                /* Otherwise, can't handle subsampled input */
                result = inImage.GetFieldDefaulted(TiffTag.YCBCRSUBSAMPLING);
                short subsamplinghor = result[0].ToShort();
                short subsamplingver = result[1].ToShort();

                if (subsamplinghor != 1 || subsamplingver != 1)
                {
                    Console.Error.WriteLine("tiffcp: {0}: Can't copy/convert subsampled image.", inImage.FileName());
                    return false;
                }
            }

            if (m_compression == Compression.JPEG)
            {
                if (input_photometric == Photometric.RGB && m_jpegcolormode == JpegColorMode.RGB)
                    outImage.SetField(TiffTag.PHOTOMETRIC, Photometric.YCBCR);
                else
                    outImage.SetField(TiffTag.PHOTOMETRIC, input_photometric);
            }
            else if (m_compression == Compression.SGILOG || m_compression == Compression.SGILOG24)
            {
                outImage.SetField(TiffTag.PHOTOMETRIC, samplesperpixel == 1 ? Photometric.LOGL : Photometric.LOGLUV);
            }
            else
            {
                if (input_compression != Compression.JPEG)
                    copyTag(inImage, outImage, TiffTag.PHOTOMETRIC, 1, TiffType.SHORT);
            }

            if (m_fillorder != 0)
                outImage.SetField(TiffTag.FILLORDER, m_fillorder);
            else
                copyTag(inImage, outImage, TiffTag.FILLORDER, 1, TiffType.SHORT);

            /*
             * Will copy `Orientation' tag from input image
             */
            result = inImage.GetFieldDefaulted(TiffTag.ORIENTATION);
            m_orientation = (Orientation)result[0].ToByte();
            switch (m_orientation)
            {
//.........这里部分代码省略.........

        static bool writeBufferToSeparateStrips(Tiff outImage, byte[] buf, int imagelength, int imagewidth, short spp)
        {
            byte[] obuf = new byte[outImage.StripSize()];

            FieldValue[] result = outImage.GetFieldDefaulted(TiffTag.ROWSPERSTRIP);
            int rowsperstrip = result[0].ToInt();

            int rowsize = imagewidth * spp;
            int strip = 0;

            for (short s = 0; s < spp; s++)
            {
                for (int row = 0; row < imagelength; row += rowsperstrip)
                {
                    int nrows = (row + rowsperstrip > imagelength) ? imagelength - row : rowsperstrip;
                    int stripsize = outImage.VStripSize(nrows);

                    cpContigBufToSeparateBuf(obuf, buf, row * rowsize + s, nrows, imagewidth, 0, 0, spp, 1);
                    if (outImage.WriteEncodedStrip(strip++, obuf, stripsize) < 0)
                    {
                        Tiff.Error(outImage.FileName(), "Error, can't write strip {0}", strip - 1);
                        return false;
                    }
                }
            }

            return true;
        }

        /*
        This function sets the input directory to the directory of a given
        page and determines information about the image.  It checks
        the image characteristics to determine if it is possible to convert
        the image data into a page of PDF output, setting values of the T2P
        struct for this page.  It determines what color space is used in
        the output PDF to represent the image.

        It determines if the image can be converted as raw data without
        requiring transcoding of the image data.
        */
        private void read_tiff_data(Tiff input)
        {
            m_pdf_transcode = t2p_transcode_t.T2P_TRANSCODE_ENCODE;
            m_pdf_sample = t2p_sample_t.T2P_SAMPLE_NOTHING;
            m_pdf_switchdecode = m_pdf_colorspace_invert;

            input.SetDirectory(m_tiff_pages[m_pdf_page].page_directory);

            FieldValue[] result = input.GetField(TiffTag.IMAGEWIDTH);
            m_tiff_width = result[0].ToInt();
            if (m_tiff_width == 0)
            {
                Tiff.Error(Tiff2PdfConstants.TIFF2PDF_MODULE, "No support for {0} with zero width", input.FileName());
                m_error = true;
                return;
            }

            result = input.GetField(TiffTag.IMAGELENGTH);
            m_tiff_length = result[0].ToInt();
            if (m_tiff_length == 0)
            {
                Tiff.Error(Tiff2PdfConstants.TIFF2PDF_MODULE, 
                    "No support for {0} with zero length", input.FileName());
                m_error = true;
                return;
            }

            result = input.GetField(TiffTag.COMPRESSION);
            if (result == null)
            {
                Tiff.Error(Tiff2PdfConstants.TIFF2PDF_MODULE, 
                    "No support for {0} with no compression tag", input.FileName());
                m_error = true;
                return;
            }
            else
                m_tiff_compression = (Compression)result[0].ToInt();

            if (!input.IsCodecConfigured(m_tiff_compression))
            {
                Tiff.Error(Tiff2PdfConstants.TIFF2PDF_MODULE, 
                    "No support for {0} with compression type {1}:  not configured", 
                    input.FileName(), m_tiff_compression);
                m_error = true;
                return;

            }

            result = input.GetFieldDefaulted(TiffTag.BITSPERSAMPLE);
            m_tiff_bitspersample = result[0].ToShort();

            switch (m_tiff_bitspersample)
            {
                case 1:
                case 2:
                case 4:
                case 8:
                    break;
                case 0:
                    Tiff.Warning(Tiff2PdfConstants.TIFF2PDF_MODULE, 
                        "Image {0} has 0 bits per sample, assuming 1", input.FileName());
                    m_tiff_bitspersample = 1;
                    break;
                default:
                    Tiff.Error(Tiff2PdfConstants.TIFF2PDF_MODULE, 
                        "No support for {0} with {1} bits per sample",
                        input.FileName(), m_tiff_bitspersample);
                    m_error = true;
                    return;
            }

            result = input.GetFieldDefaulted(TiffTag.SAMPLESPERPIXEL);
            m_tiff_samplesperpixel = result[0].ToShort();
            if (m_tiff_samplesperpixel > 4)
            {
                Tiff.Error(Tiff2PdfConstants.TIFF2PDF_MODULE, 
                    "No support for {0} with {1} samples per pixel", input.FileName(), m_tiff_samplesperpixel);
                m_error = true;
                return;
            }

            if (m_tiff_samplesperpixel == 0)
            {
                Tiff.Warning(Tiff2PdfConstants.TIFF2PDF_MODULE, 
                    "Image {0} has 0 samples per pixel, assuming 1", input.FileName());
                m_tiff_samplesperpixel = 1;
            }

            result = input.GetField(TiffTag.SAMPLEFORMAT);
//.........这里部分代码省略.........

        static bool writeBufferToContigStrips(Tiff outImage, byte[] buffer, int imagelength, int imagewidth, short spp)
        {
            FieldValue[] result = outImage.GetFieldDefaulted(TiffTag.ROWSPERSTRIP);
            int rowsperstrip = result[0].ToInt();

            int strip = 0;
            int offset = 0;
            for (int row = 0; row < imagelength; row += rowsperstrip)
            {
                int nrows = (row + rowsperstrip > imagelength) ? imagelength - row : rowsperstrip;
                int stripsize = outImage.VStripSize(nrows);

                if (outImage.WriteEncodedStrip(strip++, buffer, offset, stripsize) < 0)
                {
                    Tiff.Error(outImage.FileName(), "Error, can't write strip {0}", strip - 1);
                    return false;
                }

                offset += stripsize;
            }

            return true;
        }

        /// <summary>
        /// Creates new instance of the <see cref="TiffRgbaImage"/> class.
        /// </summary>
        /// <param name="tif">
        /// The instance of the <see cref="BitMiracle.LibTiff.Classic"/> class used to retrieve
        /// image data.
        /// </param>
        /// <param name="stopOnError">
        /// if set to <c>true</c> then an error will terminate the conversion; otherwise "get"
        /// methods will continue processing data until all the possible data in the image have
        /// been requested.
        /// </param>
        /// <param name="errorMsg">The error message (if any) gets placed here.</param>
        /// <returns>
        /// New instance of the <see cref="TiffRgbaImage"/> class if the image specified
        /// by <paramref name="tif"/> can be converted to RGBA format; otherwise, <c>null</c> is
        /// returned and <paramref name="errorMsg"/> contains the reason why it is being
        /// rejected.
        /// </returns>
        public static TiffRgbaImage Create(Tiff tif, bool stopOnError, out string errorMsg)
        {
            errorMsg = null;

            // Initialize to normal values
            TiffRgbaImage img = new TiffRgbaImage();
            img.row_offset = 0;
            img.col_offset = 0;
            img.redcmap = null;
            img.greencmap = null;
            img.bluecmap = null;
            img.req_orientation = Orientation.BOTLEFT; // It is the default
            img.tif = tif;
            img.stoponerr = stopOnError;

            FieldValue[] result = tif.GetFieldDefaulted(TiffTag.BITSPERSAMPLE);
            img.bitspersample = result[0].ToShort();
            switch (img.bitspersample)
            {
                case 1:
                case 2:
                case 4:
                case 8:
                case 16:
                    break;

                default:
                    errorMsg = string.Format(CultureInfo.InvariantCulture,
                        "Sorry, can not handle images with {0}-bit samples", img.bitspersample);
                    return null;
            }

            img.alpha = 0;
            result = tif.GetFieldDefaulted(TiffTag.SAMPLESPERPIXEL);
            img.samplesperpixel = result[0].ToShort();

            result = tif.GetFieldDefaulted(TiffTag.EXTRASAMPLES);
            short extrasamples = result[0].ToShort();
            byte[] sampleinfo = result[1].ToByteArray();

            if (extrasamples >= 1)
            {
                switch ((ExtraSample)sampleinfo[0])
                {
                    case ExtraSample.UNSPECIFIED:
                        if (img.samplesperpixel > 3)
                        {
                            // Workaround for some images without correct info about alpha channel
                            img.alpha = ExtraSample.ASSOCALPHA;
                        }
                        break;

                    case ExtraSample.ASSOCALPHA:
                        // data is pre-multiplied
                    case ExtraSample.UNASSALPHA:
                        // data is not pre-multiplied
                        img.alpha = (ExtraSample)sampleinfo[0];
                        break;
                }
            }

            if (Tiff.DEFAULT_EXTRASAMPLE_AS_ALPHA)
            {
                result = tif.GetField(TiffTag.PHOTOMETRIC);
                if (result == null)
                    img.photometric = Photometric.MINISWHITE;

                if (extrasamples == 0 && img.samplesperpixel == 4 && img.photometric == Photometric.RGB)
                {
                    img.alpha = ExtraSample.ASSOCALPHA;
                    extrasamples = 1;
                }
            }

            int colorchannels = img.samplesperpixel - extrasamples;

            result = tif.GetFieldDefaulted(TiffTag.COMPRESSION);
            Compression compress = (Compression)result[0].ToInt();

            result = tif.GetFieldDefaulted(TiffTag.PLANARCONFIG);
            PlanarConfig planarconfig = (PlanarConfig)result[0].ToShort();
//.........这里部分代码省略.........