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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 pulls single lines from the frame and reconstructs
** them from the codestream. Only the lossless scheme uses this buffer
** organization.
**
** $Id: linebuffer.hpp,v 1.11 2014/09/30 08:33:16 thor Exp $
**
*/
#ifndef CONTROL_LINEBUFFER_HPP
#define CONTROL_LINEBUFFER_HPP
/// Includes
#include "tools/environment.hpp"
///
/// Forwards
class DCT;
class UpsamplerBase;
class DownsamplerBase;
class ColorTrafo;
struct Line;
///
/// class LineBuffer
// This class pulls single lines from the frame and reconstructs
// them from the codestream. Only the lossless scheme uses this buffer
// organization.
class LineBuffer : public JKeeper {
//
// The frame this is part of.
class Frame *m_pFrame;
//
protected:
//
// Dimensions of the frame.
ULONG m_ulPixelWidth;
ULONG m_ulPixelHeight;
//
// Number of components in the frame.
UBYTE m_ucCount;
//
// Next line to be processed.
ULONG *m_pulY;
//
// Number of the topmost line.
ULONG *m_pulCurrentY;
//
// Number of pixels allocated per component.
ULONG *m_pulWidth;
//
// Length of a line in valid pixels.
ULONG *m_pulEnd;
//
// Lines:
// Top row (start of the image buffer),
// current encoding or decoding position for the codestream
// parsers, current encoding or decoding position for the user
// color transformer.
//
// First quantized image data row
struct Line **m_ppTop;
//
// Current position in stream parsing or writing.
struct Line ***m_pppCurrent;
//
// Previous line, required for the predictor.
struct Line **m_ppPrev;
//
// Build common structures for encoding and decoding
void BuildCommon(void);
//
public:
//
LineBuffer(class Frame *frame);
//
virtual ~LineBuffer(void);
//
// Return the current top MCU quantized line.
struct Line *CurrentLineOf(UBYTE comp)
{
assert(comp < m_ucCount);
return *m_pppCurrent[comp];
}
//
// Return the previous line on top of the current.
struct Line *PreviousLineOf(UBYTE comp)
{
assert(comp < m_ucCount);
return m_ppPrev[comp];
}
//
// Return the current Y coordinate.
ULONG CurrentYOf(UBYTE comp) const
{
assert(comp < m_ucCount);
return m_pulCurrentY[comp];
}
//
// Start a MCU scan by initializing the quantized rows for this row
// in this scan.
virtual bool StartMCUQuantizerRow(class Scan *scan);
//
// The same for a row of residuals.
virtual bool StartMCUResidualRow(void);
//
// Return the number of lines available for reconstruction from this scan.
virtual ULONG BufferedLines(const struct RectangleRequest *rr) const;
//
// Make sure to reset the block control to the
// start of the scan for the indicated components in the scan,
// required after collecting the statistics for this scan.
virtual void ResetToStartOfScan(class Scan *scan);
//
// Return true in case this buffer is organized in lines rather
// than blocks.
virtual bool isLineBased(void) const
{
return true;
}
//
// Post the height of the frame in lines. This happens
// when the DNL marker is processed.
virtual void PostImageHeight(ULONG lines)
{
m_ulPixelHeight = lines;
}
//
// Define a single 8x8 block starting at the x offset and the given
// line, taking the input 8x8 buffer.
void DefineRegion(LONG x,struct Line *line,const LONG *buffer,UBYTE comp);
//
// Define a single 8x8 block starting at the x offset and the given
// line, taking the input 8x8 buffer.
void FetchRegion(LONG x,const struct Line *line,LONG *buffer);
};
///
///
#endif
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