/usr/include/CharLS/losslesstraits.h is in libcharls-dev 1.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// (C) Jan de Vaan 2007-2010, all rights reserved. See the accompanying "License.txt" for licensed use.
//
#ifndef CHARLS_LOSSLESSTRAITS
#define CHARLS_LOSSLESSTRAITS
#include "header.h"
//
// optimized trait classes for lossless compression of 8 bit color and 8/16 bit monochrome images.
// This class is assumes MAXVAL correspond to a whole number of bits, and no custom RESET value is set when encoding.
// The point of this is to have the most optimized code for the most common and most demanding scenario.
template <class sample, LONG bitsperpixel>
struct LosslessTraitsImplT
{
typedef sample SAMPLE;
enum {
NEAR = 0,
bpp = bitsperpixel,
qbpp = bitsperpixel,
RANGE = (1 << bpp),
MAXVAL= (1 << bpp) - 1,
LIMIT = 2 * (bitsperpixel + MAX(8,bitsperpixel)),
RESET = BASIC_RESET
};
static inlinehint LONG ComputeErrVal(LONG d)
{ return ModRange(d); }
static inlinehint bool IsNear(LONG lhs, LONG rhs)
{ return lhs == rhs; }
static inlinehint LONG ModRange(LONG Errval)
{
return LONG(Errval << (LONG_BITCOUNT - bpp)) >> (LONG_BITCOUNT - bpp);
}
static inlinehint SAMPLE ComputeReconstructedSample(LONG Px, LONG ErrVal)
{
return SAMPLE(MAXVAL & (Px + ErrVal));
}
static inlinehint LONG CorrectPrediction(LONG Pxc)
{
if ((Pxc & MAXVAL) == Pxc)
return Pxc;
return (~(Pxc >> (LONG_BITCOUNT-1))) & MAXVAL;
}
};
template <class SAMPLE, LONG bpp>
struct LosslessTraitsT : public LosslessTraitsImplT<SAMPLE, bpp>
{
typedef SAMPLE PIXEL;
};
template<>
struct LosslessTraitsT<BYTE,8> : public LosslessTraitsImplT<BYTE, 8>
{
typedef SAMPLE PIXEL;
static inlinehint signed char ModRange(LONG Errval)
{ return (signed char)Errval; }
static inlinehint LONG ComputeErrVal(LONG d)
{ return (signed char)(d); }
static inlinehint BYTE ComputeReconstructedSample(LONG Px, LONG ErrVal)
{ return BYTE(Px + ErrVal); }
};
template<>
struct LosslessTraitsT<USHORT,16> : public LosslessTraitsImplT<USHORT,16>
{
typedef SAMPLE PIXEL;
static inlinehint short ModRange(LONG Errval)
{ return short(Errval); }
static inlinehint LONG ComputeErrVal(LONG d)
{ return short(d); }
static inlinehint SAMPLE ComputeReconstructedSample(LONG Px, LONG ErrVal)
{ return SAMPLE(Px + ErrVal); }
};
template<class SAMPLE, LONG bpp>
struct LosslessTraitsT<Triplet<SAMPLE>,bpp> : public LosslessTraitsImplT<SAMPLE,bpp>
{
typedef Triplet<SAMPLE> PIXEL;
static inlinehint bool IsNear(LONG lhs, LONG rhs)
{ return lhs == rhs; }
static inlinehint bool IsNear(PIXEL lhs, PIXEL rhs)
{ return lhs == rhs; }
static inlinehint SAMPLE ComputeReconstructedSample(LONG Px, LONG ErrVal)
{ return SAMPLE(Px + ErrVal); }
};
#endif
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