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BmpRGBSampleValue.h

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00001 /* 00002 * steghide 0.5.1 - a steganography program 00003 * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at> 00004 * 00005 * This program is free software; you can redistribute it and/or 00006 * modify it under the terms of the GNU General Public License 00007 * as published by the Free Software Foundation; either version 2 00008 * of the License, or (at your option) any later version. 00009 * 00010 * This program is distributed in the hope that it will be useful, 00011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 * GNU General Public License for more details. 00014 * 00015 * You should have received a copy of the GNU General Public License 00016 * along with this program; if not, write to the Free Software 00017 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00018 * 00019 */ 00020 00021 #ifndef SH_BMPRGBSAMPLEVALUE_H 00022 #define SH_BMPRGBSAMPLEVALUE_H 00023 00024 #include "BmpSampleValue.h" 00025 #include "RGBTriple.h" 00026 #include "common.h" 00027 00032 class BmpRGBSampleValue : public BmpSampleValue { 00033 public: 00034 BmpRGBSampleValue (BYTE r, BYTE g, BYTE b) ; 00035 BmpRGBSampleValue (RGBTriple t) ; 00036 00037 UWORD32 calcDistance (const SampleValue *s) const ; 00038 SampleValue* getNearestTargetSampleValue (EmbValue t) const ; 00039 std::string getName (void) const ; 00040 00041 BYTE getRed (void) const { return Color.Red ; } ; 00042 BYTE getGreen (void) const { return Color.Green ; } ; 00043 BYTE getBlue (void) const { return Color.Blue ; } ; 00044 00045 private: 00046 RGBTriple Color ; 00047 00048 UWORD32 calcKey (const RGBTriple& rgb) const 00049 { return (((UWORD32) rgb.Red << 16) | ((UWORD32) rgb.Green << 8) | ((UWORD32) rgb.Blue)) ;} ; 00050 00051 EmbValue calcEValue (const RGBTriple& rgb) const 00052 // { /* for Modulus 8 */ return ((EmbValue) (((rgb.Red & 1) << 2) | ((rgb.Green & 1) << 1) | (rgb.Blue & 1))) ; } ; 00053 { /* for Modulus 4 */ return ((EmbValue) ((((rgb.Red & 1) ^ (rgb.Green & 1)) << 1) | ((rgb.Red & 1) ^ (rgb.Blue & 1)))) ; } ; 00054 00055 enum COLOR { RED, GREEN, BLUE } ; 00056 enum DIRECTION { UP, DOWN } ; 00057 00062 BYTE plus (BYTE a, BYTE b) const ; 00063 00068 BYTE minus (BYTE a, BYTE b) const ; 00069 00077 void addNTSVCandidates (std::vector<RGBTriple>& cands, const BYTE cube[3][2], COLOR fc, DIRECTION fd, COLOR i1, COLOR i2, EmbValue t) const ; 00078 } ; 00079 00080 #endif // ndef SH_BMPRGBSAMPLEVALUE_H

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