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/*************************************************************************
This project implements a complete(!) JPEG (Recommendation ITU-T
T.81 | ISO/IEC 10918-1) codec, plus a library that can be used to
encode and decode JPEG streams.
It also implements ISO/IEC 18477 aka JPEG XT which is an extension
towards intermediate, high-dynamic-range lossy and lossless coding
of JPEG. In specific, it supports ISO/IEC 18477-3/-6/-7/-8 encoding.
Note that only Profiles C and D of ISO/IEC 18477-7 are supported
here. Check the JPEG XT reference software for a full implementation
of ISO/IEC 18477-7.
Copyright (C) 2012-2018 Thomas Richter, University of Stuttgart and
Accusoft. (C) 2019-2020 Thomas Richter, Fraunhofer IIS.
This program is available under two licenses, GPLv3 and the ITU
Software licence Annex A Option 2, RAND conditions.
For the full text of the GPU license option, see README.license.gpl.
For the full text of the ITU license option, see README.license.itu.
You may freely select between these two options.
For the GPL option, please note the following:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*************************************************************************/
/*
**
** This class represents a single component.
**
** $Id: component.hpp,v 1.17 2014/09/30 08:33:17 thor Exp $
**
*/
#ifndef MARKER_COMPONENT_HPP
#define MARKER_COMPONENT_HPP
/// Includes
#include "tools/environment.hpp"
#include "tools/rectangle.hpp"
///
/// Forwards
class ByteStream;
///
/// class Component
// This class represents a single component
class Component : public JKeeper {
//
// The component number from zero up.
UBYTE m_ucIndex;
//
// The component identifier
UBYTE m_ucID;
//
// The horizontal subsampling factor.
UBYTE m_ucMCUWidth;
//
// The vertical subsampling factor.
UBYTE m_ucMCUHeight;
//
// Subsampling factors in X and Y direction.
UBYTE m_ucSubX,m_ucSubY;
//
// The quantization table index to use for quantization.
UBYTE m_ucQuantTable;
//
// The bit precision of this component.
UBYTE m_ucPrecision;
//
public:
Component(class Environ *env,UBYTE idx,UBYTE prec,UBYTE subx = 1,UBYTE suby = 1);
//
~Component(void);
//
// Parse off parts of the frame marker.
void ParseMarker(class ByteStream *io);
//
// Write the contents of the component to the marker.
void WriteMarker(class ByteStream *io);
//
// Compute the subsampling factors for this component.
// Requires the maximum MCU size.
void SetSubsampling(UBYTE maxwidth,UBYTE maxheight)
{
if (maxwidth % m_ucMCUWidth != 0 || maxheight % m_ucMCUHeight) {
JPG_THROW(NOT_IMPLEMENTED,"Component::SetSubsampling",
"non-integer subsampling factors are not supported by this implementation, sorry");
}
m_ucSubX = maxwidth / m_ucMCUWidth;
m_ucSubY = maxheight / m_ucMCUHeight;
}
//
// Compute the MCU dimensions from the subsampling factors and
// the smallest common multiple of all subsampling factors.
void SetMCUSize(UBYTE maxwidth,UBYTE maxheight)
{
m_ucMCUWidth = maxwidth / m_ucSubX;
m_ucMCUHeight = maxheight / m_ucSubY;
}
//
// Return the component ID. This is arbitrary and
// only required to identify components.
UBYTE IDOf(void) const
{
return m_ucID;
}
//
// Return the component index. Counts from zero up.
UBYTE IndexOf(void) const
{
return m_ucIndex;
}
//
// Return the MCU width in blocks.
UBYTE MCUWidthOf(void) const
{
return m_ucMCUWidth;
}
//
// Return the MCU height in blocks
UBYTE MCUHeightOf(void) const
{
return m_ucMCUHeight;
}
//
// Return the subsampling in X dimension.
UBYTE SubXOf(void) const
{
return m_ucSubX;
}
//
// Return the subsampling in Y dimension.
UBYTE SubYOf(void) const
{
return m_ucSubY;
}
//
// Return the quantizer responsible for this component.
UBYTE QuantizerOf(void) const
{
return m_ucQuantTable;
}
//
// Bit precision of the component.
UBYTE PrecisionOf(void) const
{
return m_ucPrecision;
}
//
// Install the component label.
void SetComponentID(UBYTE id)
{
m_ucID = id;
}
//
// Install the component quantizer index.
void SetQuantizer(UBYTE quant)
{
m_ucQuantTable = quant;
}
};
///
///
#endif
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