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/************************************************************************************
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TerraLib - a library for developing GIS applications.
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Copyright � 2001-2004 INPE and Tecgraf/PUC-Rio.
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This code is part of the TerraLib library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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You should have received a copy of the GNU Lesser General Public
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License along with this library.
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The authors reassure the license terms regarding the warranties.
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They specifically disclaim any warranties, including, but not limited to,
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the implied warranties of merchantability and fitness for a particular purpose.
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The library provided hereunder is on an "as is" basis, and the authors have no
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obligation to provide maintenance, support, updates, enhancements, or modifications.
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In no event shall INPE and Tecgraf / PUC-Rio be held liable to any party for direct,
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indirect, special, incidental, or consequential damages arising out of the use
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of this library and its documentation.
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*************************************************************************************/
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/*! \file TeDecoderTIFF.h
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This file contais functions to deal with raster images in Tiff/GeoTIFF format.
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#ifndef __TERRALIB_INTERNAL_DECODERTIFF_H
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#define __TERRALIB_INTERNAL_DECODERTIFF_H
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#include "geo_normalize.h"
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#include "geovalues.h"
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#include "geo_tiffp.h" /* external TIFF interface */
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#include "geo_keyp.h" /* private interface */
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#include <sys/types.h>
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#include "TeDecoderVirtualMemory.h"
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#define MONOIMAGE 0 /* Image type monochrome */
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#define RGBIMAGE 1 /* Image type color image */
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#define PALLETEIMAGE 2 /* Image type pallete image */
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//! Implements a decoder to a raster in TIFF (Tagged Image File Format) format
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Decoder TIFF is based on geotiff libray (http://remotesensing.org/geotiff/geotiff.html).
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This imposes some restrictions to this decoder. Using libtiff TIFF image files may not
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be opened for both reading and writing; there is no support for altering the contents of
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a TIFF file. So this decoder is limited to create new tiff files or to read existing ones.
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class TeDecoderTIFF : public TeDecoder
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TIFF *tif; // TIFF directory structure
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GTIF *gtif; // GEOTIFF directory structure
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unsigned char *TBuffer_;
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unsigned char *TBufferTile_;
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bool isGeoTiff_; // flag that indicates georeference
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bool isTiled_; // flag indicating if image is tiled
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unsigned short photom_; // photometric interpretation
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unsigned short planar_; // storage organization : PLANARCONFIG_CONTIG or PLANARCONFIG_SEPARATE
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unsigned short compress_; // compression flag: COMPRESSION_NONE, COMPRESSION_CCITTRLE, COMPRESSION_CCITTFAX3 and others
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short TImage; // MONOIMAGE, RGBIMAGE, PALLETE
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int nBands_; // number of bands
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unsigned long bytesperline_;
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unsigned long tilew_,tileh_;
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unsigned long rowtilesize_;
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unsigned long bytespertile_;
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unsigned long rowsperstrip_;
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int TCurLine_; // current line in memory
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int TCurTile_; // current tile in memory
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bool first; // Flag to test the first access to To8Bits() function
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unsigned char Lut[256]; // Lut to convert nbits/pixel to 8bits/pixel
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unsigned short mask; // mask bits 0000...1 for 1 bit
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// 000.1111 for 2 bits and on
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// if PHOTOMETRIC_YCBCR:
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float *YCbCrCoeffs, *refBlackWhite; // Chrominance coefficients
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unsigned short YCbCrHorizSampling, // Horizontal Smapling
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YCbCrVertSampling; // Vertical and
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//! Reads TIFF Directory and fills tif structure
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void ReadTiffDirectory();
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//! Reads the georeferencing keys of a geotiff data
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//! Reads and inteprets a .tfw file associated to a tiff
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bool DecodeTFW(const string& filename);
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//! Sets the georeferencing keys of a geotiff data
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//! Write a dummy image (when creating a tiff file)
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bool WriteDummyImage();
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//! Reads a line of monochrome image
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\param lin line number to read
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\return true if line is secessfully read and false otherwise
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bool ReadMonoImage(unsigned long lin);
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//! Reads a line of color image
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/*! \param lin line number to read
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\return true if line is secessfully read and false otherwise
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bool ReadRGBImage(unsigned long lin);
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//! Reads color image if planar = PLANARCONFIG_CONTIG
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/*! \param lin line number to read
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\return non 0 if line is secessfully written and 0 otherwise
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bool ReadRGBContig(unsigned long lin);
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//! Reads color image if planar = PHOTOMETRIC_PALETTE
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/*! \param lin line number to read
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\return non 0 if line is secessfully written and 0 otherwise
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bool ReadPaletteContig(unsigned long lin);
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bool ReadTileImageContig(unsigned long lin, unsigned char *line);
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//! Allocates the internal buffers
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bool AllocateBuffer();
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//! Allocates the internal buffers
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void DeallocateBuffer();
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//! Reads Lut associated to a raster pallete
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//! Saves the associated LUT for pallete raster
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//! Converts buf to 8 bits per pixel into ret buffer
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// buf - a line of image stored in TIFF
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// ret - image line converted to 8 bits per pixel
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// image line buffer (ret) must be allocated
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// previously before call this function
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void To8Bits(u_char *buf,u_char *ret,short vmax=0, short vmin = 0,short nx=0);
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//! Prints to standard output contents of TIFF directory
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// Returns true if tiff data is compressed
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bool IsCompressed() { return compress_ != COMPRESSION_NONE; }
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//! Construtor from parameters
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TeDecoderTIFF( const TeRasterParams& );
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//! Normal destructor
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//! Initializes raster structure
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//! Clear internal parameters
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TeCoord2D index2Coord (TeCoord2D& pt);
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TeCoord2D coord2Index (TeCoord2D& pt);
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bool setElement (int col,int lin, double val, int band=0);
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bool getElement (int col,int lin, double &val,int band=0);
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//! Implements a tiff decoder factory
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class TeDecoderTIFFFactory : public TeDecoderFactory
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TeDecoderTIFFFactory(const string& name) : TeDecoderFactory(name) {}
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virtual TeDecoder* build (const TeRasterParams& arg)
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{ return new TeDecoderTIFF(arg); }
added
removed
src/terralib/kernel/TeDecoderTIFF.h
