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https://github.com/SatDump/SatDump
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129 lines
3.4 KiB
C++
129 lines
3.4 KiB
C++
/*
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* Copyright 2011-2019, European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CompressT4_included
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#define CompressT4_included
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/*******************************************************************************
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TYPE:
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Concrete classes and free functions.
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PURPOSE:
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Classes for the CCITT T.4 compression algorithm.
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Free function for decompression.
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FUNCTION:
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Performs compression and decompression of image-type data according to the
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CCITT T.4 coding scheme.
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INTERFACES:
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See 'INTERFACES:' in the module declaration below.
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RESOURCES:
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Heap Memory (>2K).
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REFERENCES:
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None.
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PROCESSING:
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Derived from the abstract base class CCompress, the concrete class
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- CCompressT4
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provides the algorithm specific parameters and Compress() methods.
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- DecompressT4() decompresses binary input image data which are coded according to
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the CCITT T.4 recommendation.
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For passing image data to and from the routines, Util::CDataField... objects are
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used.
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DATA:
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See 'DATA:' in the class header below.
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LOGIC:
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-
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*******************************************************************************/
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#include <sstream>
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#include <string>
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#include <vector>
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#include "CDataField.h" // Util
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#include "SmartPtr.h" // Util
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#include "ErrorHandling.h" // Util
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#include "Compress.h" // COMP
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namespace COMP
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{
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// Compress() function for T4 compression.
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class CCompressT4 : public COMP::CCompress
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{
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public:
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// INTERFACES:
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// Description: Compresses the input image data according to
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// the specified parameters.
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// Returns: Compressed data field.
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Util::CDataFieldCompressedImage Compress(
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const Util::CDataFieldUncompressedImage &i_Image // Image to compress.
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)
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const;
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// Description: Constructor.
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// Returns: Nothing.
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CCompressT4()
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: CCompress()
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{
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}
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// Description: Tells whether compression is lossless or lossy.
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// Returns: true : Compression is lossless.
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bool IsLossless()
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const
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{
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return true;
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}
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// Description: Retruns the set of compresion parameters in string form.
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// Returns: Compression parameters in readable form.
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std::string GetTraceString()
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const
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{
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return std::string("");
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}
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};
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// Description: Decompresses binary input image data which are coded according to
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// the CCITT T.4 recommendation.
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// Returns: Nothing.
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void DecompressT4(
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const Util::CDataFieldCompressedImage &
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i_Image, // Compressed image data.
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Util::CDataFieldUncompressedImage &
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o_ImageDecompressed, // Decompressed image data.
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std::vector<short> &o_QualityInfo // Vector with one field per image line.
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// The function will store there the number
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// of 'good' pixels, counted from the first
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// column.
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// If there are no errors, the values will be
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// equal to the total number of image columns.
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);
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} // end namespace
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#endif
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