/*
* Setup a default directory structure.
*/
private void setupDefaultDirectory()
{
int tiffFieldInfoCount;
TiffFieldInfo[] tiffFieldInfo = getFieldInfo(out tiffFieldInfoCount);
setupFieldInfo(tiffFieldInfo, tiffFieldInfoCount);
m_dir = new TiffDirectory();
m_postDecodeMethod = PostDecodeMethodType.pdmNone;
m_foundfield = null;
m_tagmethods = m_defaultTagMethods;
/*
* Give client code a chance to install their own
* tag extensions & methods, prior to compression overloads.
*/
if (m_extender != null)
m_extender(this);
SetField(TiffTag.Compression, Compression.None);
/*
* NB: The directory is marked dirty as a result of setting
* up the default compression scheme. However, this really
* isn't correct -- we want DirtyDirect to be set only
* if the user does something. We could just do the setup
* by hand, but it seems better to use the normal mechanism
* (i.e. SetField).
*/
m_flags &= ~TiffFlags.DirtyDirect;
/*
* we clear the IsTiled flag when setting up a new directory.
* Should we also be clearing stuff like InSubIFD?
*/
m_flags &= ~TiffFlags.IsTiled;
/*
* Clear other directory-specific fields.
*/
m_tilesize = -1;
m_scanlinesize = -1;
}
/// <summary>
/// Sets the new tag methods to use.
/// </summary>
/// <param name="methods">Tag methods.</param>
/// <returns>The previously used tag methods.</returns>
public TiffTagMethods SetTagMethods(TiffTagMethods methods)
{
TiffTagMethods prevTagMethods = m_tagmethods;
if (methods != null)
m_tagmethods = methods;
return prevTagMethods;
}
public OJpegCodec(Tiff tif, Compression scheme, string name)
: base(tif, scheme, name)
{
m_tagMethods = new OJpegCodecTagMethods();
}
public override bool Init()
{
Debug.Assert(m_scheme == Compression.OJPEG);
/*
* Merge codec-specific tag information.
*/
m_tif.MergeFieldInfo(ojpeg_field_info, ojpeg_field_info.Length);
m_jpeg_proc = 1;
m_subsampling_hor = 2;
m_subsampling_ver = 2;
m_tif.SetField(TiffTag.YCBCRSUBSAMPLING, 2, 2);
/* tif tag methods */
m_parentTagMethods = m_tif.m_tagmethods;
m_tif.m_tagmethods = m_tagMethods;
/* Some OJPEG files don't have strip or tile offsets or bytecounts
* tags. Some others do, but have totally meaningless or corrupt
* values in these tags. In these cases, the JpegInterchangeFormat
* stream is reliable. In any case, this decoder reads the
* compressed data itself, from the most reliable locations, and
* we need to notify encapsulating LibTiff not to read raw strips
* or tiles for us.
*/
m_tif.m_flags |= TiffFlags.NoReadRaw;
return true;
}
public override bool Init()
{
Debug.Assert(m_scheme == Compression.JPEG);
/*
* Merge codec-specific tag information and override parent get/set
* field methods.
*/
m_tif.MergeFieldInfo(jpegFieldInfo, jpegFieldInfo.Length);
/*
* Allocate state block so tag methods have storage to record values.
*/
m_compression = null;
m_decompression = null;
m_photometric = 0;
m_h_sampling = 0;
m_v_sampling = 0;
m_bytesperline = 0;
m_scancount = 0;
m_samplesperclump = 0;
m_recvtime = 0;
m_parentTagMethods = m_tif.m_tagmethods;
m_tif.m_tagmethods = m_tagMethods;
/* Default values for codec-specific fields */
m_jpegtables = null;
m_jpegtables_length = 0;
m_jpegquality = 75; /* Default IJG quality */
m_jpegcolormode = JpegColorMode.RGB;
m_jpegtablesmode = JpegTablesMode.Quant | JpegTablesMode.Huff;
m_recvparams = 0;
m_subaddress = null;
m_faxdcs = null;
m_ycbcrsampling_fetched = false;
m_rawDecode = false;
m_rawEncode = false;
m_tif.m_flags |= TiffFlags.NoBitRev; // no bit reversal, please
m_cinfo_initialized = false;
/*
** Create a JPEGTables field if no directory has yet been created.
** We do this just to ensure that sufficient space is reserved for
** the JPEGTables field. It will be properly created the right
** size later.
*/
if (m_tif.m_diroff == 0)
{
const int SIZE_OF_JPEGTABLES = 2000;
// The following line assumes incorrectly that all JPEG-in-TIFF
// files will have a JpegTables tag generated and causes
// null-filled JpegTables tags to be written when the JPEG data
// is placed with WriteRawStrip. The field bit should be
// set, anyway, later when actual JpegTables header is
// generated, so removing it here hopefully is harmless.
//
// m_tif.setFieldBit(FIELD_JPEGTABLES);
//
m_jpegtables_length = SIZE_OF_JPEGTABLES;
m_jpegtables = new byte[m_jpegtables_length];
}
/*
* Mark the YCBCRSAMPLES as present even if it is not
* see: JPEGFixupTestSubsampling().
*/
m_tif.setFieldBit(FieldBit.YCbCrSubsampling);
return true;
}
// tagMethods can be null
public void TIFFPredictorInit(TiffTagMethods tagMethods)
{
// Merge codec-specific tag information and override parent get/set field methods.
m_tif.MergeFieldInfo(m_predictFieldInfo, m_predictFieldInfo.Length);
m_childTagMethods = tagMethods;
m_parentTagMethods = m_tif.m_tagmethods;
m_tif.m_tagmethods = m_tagMethods;
m_predictor = PredictionScheme.None; // default value
m_predictorType = PredictorType.ptNone; // no predictor method
}
public CodecWithPredictor(Tiff tif, Compression scheme, string name)
: base(tif, scheme, name)
{
m_tagMethods = new CodecWithPredictorTagMethods();
}
private void InitCCITTFax3()
{
/*
* Merge codec-specific tag information and
* override parent get/set field methods.
*/
m_tif.MergeFieldInfo(m_faxFieldInfo, m_faxFieldInfo.Length);
/*
* Allocate state block so tag methods have storage to record values.
*/
m_rw_mode = m_tif.m_mode;
m_parentTagMethods = m_tif.m_tagmethods;
m_tif.m_tagmethods = m_tagMethods;
m_groupoptions = 0;
m_recvparams = 0;
m_subaddress = null;
m_faxdcs = null;
if (m_rw_mode == Tiff.O_RDONLY)
{
// FIXME: improve for in place update
m_tif.m_flags |= TiffFlags.NoBitRev;
// decoder does bit reversal
}
m_runs = null;
m_tif.SetField(TiffTag.FAXFILLFUNC, new Tiff.FaxFillFunc(fax3FillRuns));
m_refline = null;
m_decoder = Decoder.useFax3_1DDecoder;
m_encodingFax4 = false;
}
private Tiff()
{
m_clientdata = 0;
m_postDecodeMethod = PostDecodeMethodType.pdmNone;
setupBuiltInCodecs();
m_defaultTagMethods = new TiffTagMethods();
m_defaultErrorHandler = null;
if (m_errorHandler == null)
{
// user did not setup custom handler.
// install default
m_defaultErrorHandler = new TiffErrorHandler();
m_errorHandler = m_defaultErrorHandler;
}
}
