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BmpRGBSampleValue.h
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/*
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* steghide 0.5.1 - a steganography program
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* Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef SH_BMPRGBSAMPLEVALUE_H
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#define SH_BMPRGBSAMPLEVALUE_H
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#include "
BmpSampleValue.h
"
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#include "
RGBTriple.h
"
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#include "
common.h
"
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class
BmpRGBSampleValue
:
public
BmpSampleValue
{
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public
:
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BmpRGBSampleValue
(
BYTE
r,
BYTE
g,
BYTE
b) ;
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BmpRGBSampleValue
(
RGBTriple
t) ;
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UWORD32
calcDistance
(
const
SampleValue
*s)
const
;
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SampleValue
*
getNearestTargetSampleValue
(
EmbValue
t)
const
;
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std::string
getName
(
void
)
const
;
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BYTE
getRed
(
void
)
const
{
return
Color
.
Red
; } ;
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BYTE
getGreen
(
void
)
const
{
return
Color
.
Green
; } ;
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BYTE
getBlue
(
void
)
const
{
return
Color
.
Blue
; } ;
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private
:
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RGBTriple
Color
;
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UWORD32
calcKey
(
const
RGBTriple
& rgb)
const
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{
return
(((
UWORD32
) rgb.
Red
<< 16) | ((
UWORD32
) rgb.
Green
<< 8) | ((
UWORD32
) rgb.
Blue
)) ;} ;
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EmbValue
calcEValue
(
const
RGBTriple
& rgb)
const
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// { /* for Modulus 8 */ return ((EmbValue) (((rgb.Red & 1) << 2) | ((rgb.Green & 1) << 1) | (rgb.Blue & 1))) ; } ;
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{
/* for Modulus 4 */
return
((
EmbValue
) ((((rgb.Red & 1) ^ (rgb.Green & 1)) << 1) | ((rgb.Red & 1) ^ (rgb.Blue & 1)))) ; } ;
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enum
COLOR
{
RED
,
GREEN
,
BLUE
} ;
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enum
DIRECTION
{
UP
,
DOWN
} ;
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BYTE
plus
(
BYTE
a,
BYTE
b)
const
;
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BYTE
minus
(
BYTE
a,
BYTE
b)
const
;
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void
addNTSVCandidates
(std::vector<RGBTriple>& cands,
const
BYTE
cube[3][2],
COLOR
fc,
DIRECTION
fd,
COLOR
i1,
COLOR
i2,
EmbValue
t)
const
;
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} ;
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#endif // ndef SH_BMPRGBSAMPLEVALUE_H
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