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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "EtcBlock4x4Encoding.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcDifferentialTrys.h"
#include "EtcIndividualTrys.h"
namespace Etc
{
// base class for Block4x4Encoding_RGB8
class Block4x4Encoding_ETC1 : public Block4x4Encoding
{
public:
Block4x4Encoding_ETC1(void);
virtual ~Block4x4Encoding_ETC1(void);
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits,
ErrorMetric a_errormetric);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
inline virtual bool GetFlip(void)
{
return m_boolFlip;
}
inline virtual bool IsDifferential(void)
{
return m_boolDiff;
}
virtual void SetEncodingBits(void);
void Decode(void);
inline ColorFloatRGBA GetColor1(void) const
{
return m_frgbaColor1;
}
inline ColorFloatRGBA GetColor2(void) const
{
return m_frgbaColor2;
}
inline const unsigned int * GetSelectors(void) const
{
return m_auiSelectors;
}
inline unsigned int GetCW1(void) const
{
return m_uiCW1;
}
inline unsigned int GetCW2(void) const
{
return m_uiCW2;
}
inline bool HasSeverelyBentDifferentialColors(void) const
{
return m_boolSeverelyBentDifferentialColors;
}
protected:
static const unsigned int s_auiPixelOrderFlip0[PIXELS];
static const unsigned int s_auiPixelOrderFlip1[PIXELS];
static const unsigned int s_auiPixelOrderHScan[PIXELS];
static const unsigned int s_auiLeftPixelMapping[8];
static const unsigned int s_auiRightPixelMapping[8];
static const unsigned int s_auiTopPixelMapping[8];
static const unsigned int s_auiBottomPixelMapping[8];
static const unsigned int SELECTOR_BITS = 2;
static const unsigned int SELECTORS = 1 << SELECTOR_BITS;
static const unsigned int CW_BITS = 3;
static const unsigned int CW_RANGES = 1 << CW_BITS;
static float s_aafCwTable[CW_RANGES][SELECTORS];
static unsigned char s_aucDifferentialCwRange[256];
static const int MAX_DIFFERENTIAL = 3;
static const int MIN_DIFFERENTIAL = -4;
void InitFromEncodingBits_Selectors(void);
void PerformFirstIteration(void);
void CalculateMostLikelyFlip(void);
void TryDifferential(bool a_boolFlip, unsigned int a_uiRadius,
int a_iGrayOffset1, int a_iGrayOffset2);
void TryDifferentialHalf(DifferentialTrys::Half *a_phalf);
void TryIndividual(bool a_boolFlip, unsigned int a_uiRadius);
void TryIndividualHalf(IndividualTrys::Half *a_phalf);
void TryDegenerates1(void);
void TryDegenerates2(void);
void TryDegenerates3(void);
void TryDegenerates4(void);
void CalculateSelectors();
void CalculateHalfOfTheSelectors(unsigned int a_uiHalf,
const unsigned int *pauiPixelMapping);
// calculate the distance2 of r_frgbaPixel from r_frgbaTarget's gray line
inline float CalcGrayDistance2(ColorFloatRGBA &r_frgbaPixel,
ColorFloatRGBA &r_frgbaTarget)
{
float fDeltaGray = ((r_frgbaPixel.fR - r_frgbaTarget.fR) +
(r_frgbaPixel.fG - r_frgbaTarget.fG) +
(r_frgbaPixel.fB - r_frgbaTarget.fB)) / 3.0f;
ColorFloatRGBA frgbaPointOnGrayLine = (r_frgbaTarget + fDeltaGray).ClampRGB();
float fDR = r_frgbaPixel.fR - frgbaPointOnGrayLine.fR;
float fDG = r_frgbaPixel.fG - frgbaPointOnGrayLine.fG;
float fDB = r_frgbaPixel.fB - frgbaPointOnGrayLine.fB;
return (fDR*fDR) + (fDG*fDG) + (fDB*fDB);
}
void SetEncodingBits_Selectors(void);
// intermediate encoding
bool m_boolDiff;
bool m_boolFlip;
ColorFloatRGBA m_frgbaColor1;
ColorFloatRGBA m_frgbaColor2;
unsigned int m_uiCW1;
unsigned int m_uiCW2;
unsigned int m_auiSelectors[PIXELS];
// state shared between iterations
ColorFloatRGBA m_frgbaSourceAverageLeft;
ColorFloatRGBA m_frgbaSourceAverageRight;
ColorFloatRGBA m_frgbaSourceAverageTop;
ColorFloatRGBA m_frgbaSourceAverageBottom;
bool m_boolMostLikelyFlip;
// stats
float m_fError1; // error for Etc1 half 1
float m_fError2; // error for Etc1 half 2
bool m_boolSeverelyBentDifferentialColors; // only valid if m_boolDiff;
// final encoding
Block4x4EncodingBits_RGB8 *m_pencodingbitsRGB8; // or RGB8 portion of Block4x4EncodingBits_RGB8A8
private:
void CalculateSourceAverages(void);
};
} // namespace Etc
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