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Add some external dependencies.

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This commit is contained in:
Ignacio
2017-02-08 11:42:25 -08:00
parent 1004d5d5b5
commit d7612a3b67
64 changed files with 38084 additions and 1 deletions
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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.
*/
/*
EtcBlock4x4.cpp
Implements the state associated with each 4x4 block of pixels in an image
Source images that are not a multiple of 4x4 are extended to fill the Block4x4 using pixels with an
alpha of NAN
*/
#include "EtcConfig.h"
#include "EtcBlock4x4.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcColor.h"
#include "EtcImage.h"
#include "EtcColorFloatRGBA.h"
#include "EtcBlock4x4Encoding_RGB8.h"
#include "EtcBlock4x4Encoding_RGBA8.h"
#include "EtcBlock4x4Encoding_RGB8A1.h"
#include "EtcBlock4x4Encoding_R11.h"
#include "EtcBlock4x4Encoding_RG11.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
namespace Etc
{
// ETC pixels are scanned vertically.
// this mapping is for when someone wants to scan the ETC pixels horizontally
const unsigned int Block4x4::s_auiPixelOrderHScan[PIXELS] = { 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15 };
// ----------------------------------------------------------------------------------------------------
//
Block4x4::Block4x4(void)
{
m_pimageSource = nullptr;
m_uiSourceH = 0;
m_uiSourceV = 0;
m_sourcealphamix = SourceAlphaMix::UNKNOWN;
m_boolBorderPixels = false;
m_boolPunchThroughPixels = false;
m_pencoding = nullptr;
m_errormetric = ErrorMetric::NUMERIC;
}
Block4x4::~Block4x4()
{
m_pimageSource = nullptr;
if (m_pencoding)
{
delete m_pencoding;
m_pencoding = nullptr;
}
}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding from a source image
// [a_uiSourceH,a_uiSourceV] is the location of the block in a_pimageSource
// a_paucEncodingBits is the place to store the final encoding
// a_errormetric is used for finding the best encoding
//
void Block4x4::InitFromSource(Image *a_pimageSource,
unsigned int a_uiSourceH, unsigned int a_uiSourceV,
unsigned char *a_paucEncodingBits,
ErrorMetric a_errormetric)
{
Block4x4();
m_pimageSource = a_pimageSource;
m_uiSourceH = a_uiSourceH;
m_uiSourceV = a_uiSourceV;
m_errormetric = a_errormetric;
SetSourcePixels();
// set block encoder function
switch (m_pimageSource->GetFormat())
{
case Image::Format::ETC1:
m_pencoding = new Block4x4Encoding_ETC1;
break;
case Image::Format::RGB8:
case Image::Format::SRGB8:
m_pencoding = new Block4x4Encoding_RGB8;
break;
case Image::Format::RGBA8:
case Image::Format::SRGBA8:
switch (m_sourcealphamix)
{
case SourceAlphaMix::OPAQUE:
m_pencoding = new Block4x4Encoding_RGBA8_Opaque;
break;
case SourceAlphaMix::TRANSPARENT:
m_pencoding = new Block4x4Encoding_RGBA8_Transparent;
break;
case SourceAlphaMix::TRANSLUCENT:
m_pencoding = new Block4x4Encoding_RGBA8;
break;
default:
assert(0);
break;
}
break;
case Image::Format::RGB8A1:
case Image::Format::SRGB8A1:
switch (m_sourcealphamix)
{
case SourceAlphaMix::OPAQUE:
m_pencoding = new Block4x4Encoding_RGB8A1_Opaque;
break;
case SourceAlphaMix::TRANSPARENT:
m_pencoding = new Block4x4Encoding_RGB8A1_Transparent;
break;
case SourceAlphaMix::TRANSLUCENT:
if (m_boolPunchThroughPixels)
{
m_pencoding = new Block4x4Encoding_RGB8A1;
}
else
{
m_pencoding = new Block4x4Encoding_RGB8A1_Opaque;
}
break;
default:
assert(0);
break;
}
break;
case Image::Format::R11:
case Image::Format::SIGNED_R11:
m_pencoding = new Block4x4Encoding_R11;
break;
case Image::Format::RG11:
case Image::Format::SIGNED_RG11:
m_pencoding = new Block4x4Encoding_RG11;
break;
default:
assert(0);
break;
}
m_pencoding->InitFromSource(this, m_afrgbaSource,
a_paucEncodingBits, a_errormetric);
}
// ----------------------------------------------------------------------------------------------------
// initialization of encoding state from a prior encoding using encoding bits
// [a_uiSourceH,a_uiSourceV] is the location of the block in a_pimageSource
// a_paucEncodingBits is the place to read the prior encoding
// a_imageformat is used to determine how to interpret a_paucEncodingBits
// a_errormetric was used for the prior encoding
//
void Block4x4::InitFromEtcEncodingBits(Image::Format a_imageformat,
unsigned int a_uiSourceH, unsigned int a_uiSourceV,
unsigned char *a_paucEncodingBits,
Image *a_pimageSource,
ErrorMetric a_errormetric)
{
Block4x4();
m_pimageSource = a_pimageSource;
m_uiSourceH = a_uiSourceH;
m_uiSourceV = a_uiSourceV;
m_errormetric = a_errormetric;
SetSourcePixels();
// set block encoder function
switch (a_imageformat)
{
case Image::Format::ETC1:
m_pencoding = new Block4x4Encoding_ETC1;
break;
case Image::Format::RGB8:
case Image::Format::SRGB8:
m_pencoding = new Block4x4Encoding_RGB8;
break;
case Image::Format::RGBA8:
case Image::Format::SRGBA8:
m_pencoding = new Block4x4Encoding_RGBA8;
break;
case Image::Format::RGB8A1:
case Image::Format::SRGB8A1:
m_pencoding = new Block4x4Encoding_RGB8A1;
break;
case Image::Format::R11:
case Image::Format::SIGNED_R11:
m_pencoding = new Block4x4Encoding_R11;
break;
case Image::Format::RG11:
case Image::Format::SIGNED_RG11:
m_pencoding = new Block4x4Encoding_RG11;
break;
default:
assert(0);
break;
}
m_pencoding->InitFromEncodingBits(this, a_paucEncodingBits, m_afrgbaSource,
m_pimageSource->GetErrorMetric());
}
// ----------------------------------------------------------------------------------------------------
// set source pixels from m_pimageSource
// set m_alphamix
//
void Block4x4::SetSourcePixels(void)
{
Image::Format imageformat = m_pimageSource->GetFormat();
// alpha census
unsigned int uiTransparentSourcePixels = 0;
unsigned int uiOpaqueSourcePixels = 0;
// copy source to consecutive memory locations
// convert from image horizontal scan to block vertical scan
unsigned int uiPixel = 0;
for (unsigned int uiBlockPixelH = 0; uiBlockPixelH < Block4x4::COLUMNS; uiBlockPixelH++)
{
unsigned int uiSourcePixelH = m_uiSourceH + uiBlockPixelH;
for (unsigned int uiBlockPixelV = 0; uiBlockPixelV < Block4x4::ROWS; uiBlockPixelV++)
{
unsigned int uiSourcePixelV = m_uiSourceV + uiBlockPixelV;
ColorFloatRGBA *pfrgbaSource = m_pimageSource->GetSourcePixel(uiSourcePixelH, uiSourcePixelV);
// if pixel extends beyond source image because of block padding
if (pfrgbaSource == nullptr)
{
m_afrgbaSource[uiPixel] = ColorFloatRGBA(0.0f, 0.0f, 0.0f, NAN); // denotes border pixel
m_boolBorderPixels = true;
uiTransparentSourcePixels++;
}
else
{
//get teh current pixel data, and store some of the attributes
//before capping values to fit the encoder type
m_afrgbaSource[uiPixel] = (*pfrgbaSource).ClampRGBA();
if (m_afrgbaSource[uiPixel].fA == 1.0f)
{
m_pimageSource->m_iNumOpaquePixels++;
}
else if (m_afrgbaSource[uiPixel].fA == 0.0f)
{
m_pimageSource->m_iNumTransparentPixels++;
}
else if(m_afrgbaSource[uiPixel].fA > 0.0f && m_afrgbaSource[uiPixel].fA < 1.0f)
{
m_pimageSource->m_iNumTranslucentPixels++;
}
else
{
m_pimageSource->m_numOutOfRangeValues.fA++;
}
if (m_afrgbaSource[uiPixel].fR != 0.0f)
{
m_pimageSource->m_numColorValues.fR++;
//make sure we are getting a float between 0-1
if (m_afrgbaSource[uiPixel].fR - 1.0f > 0.0f)
{
m_pimageSource->m_numOutOfRangeValues.fR++;
}
}
if (m_afrgbaSource[uiPixel].fG != 0.0f)
{
m_pimageSource->m_numColorValues.fG++;
if (m_afrgbaSource[uiPixel].fG - 1.0f > 0.0f)
{
m_pimageSource->m_numOutOfRangeValues.fG++;
}
}
if (m_afrgbaSource[uiPixel].fB != 0.0f)
{
m_pimageSource->m_numColorValues.fB++;
if (m_afrgbaSource[uiPixel].fB - 1.0f > 0.0f)
{
m_pimageSource->m_numOutOfRangeValues.fB++;
}
}
// for formats with no alpha, set source alpha to 1
if (imageformat == Image::Format::ETC1 ||
imageformat == Image::Format::RGB8 ||
imageformat == Image::Format::SRGB8)
{
m_afrgbaSource[uiPixel].fA = 1.0f;
}
if (imageformat == Image::Format::R11 ||
imageformat == Image::Format::SIGNED_R11)
{
m_afrgbaSource[uiPixel].fA = 1.0f;
m_afrgbaSource[uiPixel].fG = 0.0f;
m_afrgbaSource[uiPixel].fB = 0.0f;
}
if (imageformat == Image::Format::RG11 ||
imageformat == Image::Format::SIGNED_RG11)
{
m_afrgbaSource[uiPixel].fA = 1.0f;
m_afrgbaSource[uiPixel].fB = 0.0f;
}
// for RGB8A1, set source alpha to 0.0 or 1.0
// set punch through flag
if (imageformat == Image::Format::RGB8A1 ||
imageformat == Image::Format::SRGB8A1)
{
if (m_afrgbaSource[uiPixel].fA >= 0.5f)
{
m_afrgbaSource[uiPixel].fA = 1.0f;
}
else
{
m_afrgbaSource[uiPixel].fA = 0.0f;
m_boolPunchThroughPixels = true;
}
}
if (m_afrgbaSource[uiPixel].fA == 1.0f)
{
uiOpaqueSourcePixels++;
}
else if (m_afrgbaSource[uiPixel].fA == 0.0f)
{
uiTransparentSourcePixels++;
}
}
uiPixel += 1;
}
}
if (uiOpaqueSourcePixels == PIXELS)
{
m_sourcealphamix = SourceAlphaMix::OPAQUE;
}
else if (uiTransparentSourcePixels == PIXELS)
{
m_sourcealphamix = SourceAlphaMix::TRANSPARENT;
}
else
{
m_sourcealphamix = SourceAlphaMix::TRANSLUCENT;
}
}
// ----------------------------------------------------------------------------------------------------
// return a name for the encoding mode
//
const char * Block4x4::GetEncodingModeName(void)
{
switch (m_pencoding->GetMode())
{
case Block4x4Encoding::MODE_ETC1:
return "ETC1";
case Block4x4Encoding::MODE_T:
return "T";
case Block4x4Encoding::MODE_H:
return "H";
case Block4x4Encoding::MODE_PLANAR:
return "PLANAR";
default:
return "???";
}
}
// ----------------------------------------------------------------------------------------------------
//
}

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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 "EtcColor.h"
#include "EtcColorFloatRGBA.h"
#include "EtcErrorMetric.h"
#include "EtcImage.h"
#include "EtcBlock4x4Encoding.h"
namespace Etc
{
class Block4x4EncodingBits;
class Block4x4
{
public:
static const unsigned int ROWS = 4;
static const unsigned int COLUMNS = 4;
static const unsigned int PIXELS = ROWS * COLUMNS;
// the alpha mix for a 4x4 block of pixels
enum class SourceAlphaMix
{
UNKNOWN,
//
OPAQUE, // all 1.0
TRANSPARENT, // all 0.0 or NAN
TRANSLUCENT // not all opaque or transparent
};
typedef void (Block4x4::*EncoderFunctionPtr)(void);
Block4x4(void);
~Block4x4();
void InitFromSource(Image *a_pimageSource,
unsigned int a_uiSourceH,
unsigned int a_uiSourceV,
unsigned char *a_paucEncodingBits,
ErrorMetric a_errormetric);
void InitFromEtcEncodingBits(Image::Format a_imageformat,
unsigned int a_uiSourceH,
unsigned int a_uiSourceV,
unsigned char *a_paucEncodingBits,
Image *a_pimageSource,
ErrorMetric a_errormetric);
// return true if final iteration was performed
inline void PerformEncodingIteration(float a_fEffort)
{
m_pencoding->PerformIteration(a_fEffort);
}
inline void SetEncodingBitsFromEncoding(void)
{
m_pencoding->SetEncodingBits();
}
inline unsigned int GetSourceH(void)
{
return m_uiSourceH;
}
inline unsigned int GetSourceV(void)
{
return m_uiSourceV;
}
inline float GetError(void)
{
return m_pencoding->GetError();
}
static const unsigned int s_auiPixelOrderHScan[PIXELS];
inline ColorFloatRGBA * GetDecodedColors(void)
{
return m_pencoding->GetDecodedColors();
}
inline float * GetDecodedAlphas(void)
{
return m_pencoding->GetDecodedAlphas();
}
inline Block4x4Encoding::Mode GetEncodingMode(void)
{
return m_pencoding->GetMode();
}
inline bool GetFlip(void)
{
return m_pencoding->GetFlip();
}
inline bool IsDifferential(void)
{
return m_pencoding->IsDifferential();
}
inline ColorFloatRGBA * GetSource()
{
return m_afrgbaSource;
}
inline ErrorMetric GetErrorMetric()
{
return m_errormetric;
}
const char * GetEncodingModeName(void);
inline Block4x4Encoding * GetEncoding(void)
{
return m_pencoding;
}
inline SourceAlphaMix GetSourceAlphaMix(void)
{
return m_sourcealphamix;
}
inline Image * GetImageSource(void)
{
return m_pimageSource;
}
inline bool HasBorderPixels(void)
{
return m_boolBorderPixels;
}
inline bool HasPunchThroughPixels(void)
{
return m_boolPunchThroughPixels;
}
private:
void SetSourcePixels(void);
Image *m_pimageSource;
unsigned int m_uiSourceH;
unsigned int m_uiSourceV;
ErrorMetric m_errormetric;
ColorFloatRGBA m_afrgbaSource[PIXELS]; // vertical scan
SourceAlphaMix m_sourcealphamix;
bool m_boolBorderPixels; // marked as rgba(NAN, NAN, NAN, NAN)
bool m_boolPunchThroughPixels; // RGB8A1 or SRGB8A1 with any pixels with alpha < 0.5
Block4x4Encoding *m_pencoding;
};
} // namespace Etc

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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.
*/
/*
EtcBlock4x4Encoding.cpp
Block4x4Encoding is the abstract base class for the different encoders. Each encoder targets a
particular file format (e.g. ETC1, RGB8, RGBA8, R11)
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
//
const float Block4x4Encoding::LUMA_WEIGHT = 3.0f;
const float Block4x4Encoding::CHROMA_BLUE_WEIGHT = 0.5f;
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding::Block4x4Encoding(void)
{
m_pblockParent = nullptr;
m_pafrgbaSource = nullptr;
m_boolBorderPixels = false;
m_fError = -1.0f;
m_mode = MODE_UNKNOWN;
m_uiEncodingIterations = 0;
m_boolDone = false;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(-1.0f, -1.0f, -1.0f, -1.0f);
m_afDecodedAlphas[uiPixel] = -1.0f;
}
}
// ----------------------------------------------------------------------------------------------------
// initialize the generic encoding for a 4x4 block
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// init the decoded pixels to -1 to mark them as undefined
// init the error to -1 to mark it as undefined
//
void Block4x4Encoding::Init(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pblockParent = a_pblockParent;
m_pafrgbaSource = a_pafrgbaSource;
m_boolBorderPixels = m_pblockParent->HasBorderPixels();
m_fError = -1.0f;
m_uiEncodingIterations = 0;
m_errormetric = a_errormetric;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(-1.0f, -1.0f, -1.0f, -1.0f);
m_afDecodedAlphas[uiPixel] = -1.0f;
}
}
// ----------------------------------------------------------------------------------------------------
// calculate the error for the block by summing the pixel errors
//
void Block4x4Encoding::CalcBlockError(void)
{
m_fError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_fError += CalcPixelError(m_afrgbaDecodedColors[uiPixel], m_afDecodedAlphas[uiPixel],
m_pafrgbaSource[uiPixel]);
}
}
// ----------------------------------------------------------------------------------------------------
// calculate the error between the source pixel and the decoded pixel
// the error amount is base on the error metric
//
float Block4x4Encoding::CalcPixelError(ColorFloatRGBA a_frgbaDecodedColor, float a_fDecodedAlpha,
ColorFloatRGBA a_frgbaSourcePixel)
{
// if a border pixel
if (isnan(a_frgbaSourcePixel.fA))
{
return 0.0f;
}
if (m_errormetric == ErrorMetric::RGBA)
{
assert(a_fDecodedAlpha >= 0.0f);
float fDRed = (a_fDecodedAlpha * a_frgbaDecodedColor.fR) -
(a_frgbaSourcePixel.fA * a_frgbaSourcePixel.fR);
float fDGreen = (a_fDecodedAlpha * a_frgbaDecodedColor.fG) -
(a_frgbaSourcePixel.fA * a_frgbaSourcePixel.fG);
float fDBlue = (a_fDecodedAlpha * a_frgbaDecodedColor.fB) -
(a_frgbaSourcePixel.fA * a_frgbaSourcePixel.fB);
float fDAlpha = a_fDecodedAlpha - a_frgbaSourcePixel.fA;
return fDRed*fDRed + fDGreen*fDGreen + fDBlue*fDBlue + fDAlpha*fDAlpha;
}
else if (m_errormetric == ErrorMetric::REC709)
{
assert(a_fDecodedAlpha >= 0.0f);
float fLuma1 = a_frgbaSourcePixel.fR*0.2126f + a_frgbaSourcePixel.fG*0.7152f + a_frgbaSourcePixel.fB*0.0722f;
float fChromaR1 = 0.5f * ((a_frgbaSourcePixel.fR - fLuma1) * (1.0f / (1.0f - 0.2126f)));
float fChromaB1 = 0.5f * ((a_frgbaSourcePixel.fB - fLuma1) * (1.0f / (1.0f - 0.0722f)));
float fLuma2 = a_frgbaDecodedColor.fR*0.2126f +
a_frgbaDecodedColor.fG*0.7152f +
a_frgbaDecodedColor.fB*0.0722f;
float fChromaR2 = 0.5f * ((a_frgbaDecodedColor.fR - fLuma2) * (1.0f / (1.0f - 0.2126f)));
float fChromaB2 = 0.5f * ((a_frgbaDecodedColor.fB - fLuma2) * (1.0f / (1.0f - 0.0722f)));
float fDeltaL = a_frgbaSourcePixel.fA * fLuma1 - a_fDecodedAlpha * fLuma2;
float fDeltaCr = a_frgbaSourcePixel.fA * fChromaR1 - a_fDecodedAlpha * fChromaR2;
float fDeltaCb = a_frgbaSourcePixel.fA * fChromaB1 - a_fDecodedAlpha * fChromaB2;
float fDAlpha = a_fDecodedAlpha - a_frgbaSourcePixel.fA;
// Favor Luma accuracy over Chroma, and Red over Blue
return LUMA_WEIGHT*fDeltaL*fDeltaL +
fDeltaCr*fDeltaCr +
CHROMA_BLUE_WEIGHT*fDeltaCb*fDeltaCb +
fDAlpha*fDAlpha;
#if 0
float fDRed = a_frgbaDecodedPixel.fR - a_frgbaSourcePixel.fR;
float fDGreen = a_frgbaDecodedPixel.fG - a_frgbaSourcePixel.fG;
float fDBlue = a_frgbaDecodedPixel.fB - a_frgbaSourcePixel.fB;
return 2.0f * 3.0f * fDeltaL * fDeltaL + fDRed*fDRed + fDGreen*fDGreen + fDBlue*fDBlue;
#endif
}
else if (m_errormetric == ErrorMetric::NORMALXYZ)
{
float fDecodedX = 2.0f * a_frgbaDecodedColor.fR - 1.0f;
float fDecodedY = 2.0f * a_frgbaDecodedColor.fG - 1.0f;
float fDecodedZ = 2.0f * a_frgbaDecodedColor.fB - 1.0f;
float fDecodedLength = sqrtf(fDecodedX*fDecodedX + fDecodedY*fDecodedY + fDecodedZ*fDecodedZ);
if (fDecodedLength < 0.5f)
{
return 1.0f;
}
else if (fDecodedLength == 0.0f)
{
fDecodedX = 1.0f;
fDecodedY = 0.0f;
fDecodedZ = 0.0f;
}
else
{
fDecodedX /= fDecodedLength;
fDecodedY /= fDecodedLength;
fDecodedZ /= fDecodedLength;
}
float fSourceX = 2.0f * a_frgbaSourcePixel.fR - 1.0f;
float fSourceY = 2.0f * a_frgbaSourcePixel.fG - 1.0f;
float fSourceZ = 2.0f * a_frgbaSourcePixel.fB - 1.0f;
float fSourceLength = sqrtf(fSourceX*fSourceX + fSourceY*fSourceY + fSourceZ*fSourceZ);
if (fSourceLength == 0.0f)
{
fSourceX = 1.0f;
fSourceY = 0.0f;
fSourceZ = 0.0f;
}
else
{
fSourceX /= fSourceLength;
fSourceY /= fSourceLength;
fSourceZ /= fSourceLength;
}
float fDotProduct = fSourceX*fDecodedX + fSourceY*fDecodedY + fSourceZ*fDecodedZ;
float fNormalizedDotProduct = 1.0f - 0.5f * (fDotProduct + 1.0f);
float fDotProductError = fNormalizedDotProduct * fNormalizedDotProduct;
float fLength2 = fDecodedX*fDecodedX + fDecodedY*fDecodedY + fDecodedZ*fDecodedZ;
float fLength2Error = fabsf(1.0f - fLength2);
float fDeltaW = a_frgbaDecodedColor.fA - a_frgbaSourcePixel.fA;
float fErrorW = fDeltaW * fDeltaW;
return fDotProductError + fLength2Error + fErrorW;
}
else // ErrorMetric::NUMERIC
{
assert(a_fDecodedAlpha >= 0.0f);
float fDX = a_frgbaDecodedColor.fR - a_frgbaSourcePixel.fR;
float fDY = a_frgbaDecodedColor.fG - a_frgbaSourcePixel.fG;
float fDZ = a_frgbaDecodedColor.fB - a_frgbaSourcePixel.fB;
float fDW = a_frgbaDecodedColor.fA - a_frgbaSourcePixel.fA;
return fDX*fDX + fDY*fDY + fDZ*fDZ + fDW*fDW;
}
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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 "EtcColorFloatRGBA.h"
#include "EtcErrorMetric.h"
#include <assert.h>
#include <float.h>
namespace Etc
{
class Block4x4;
// abstract base class for specific encodings
class Block4x4Encoding
{
public:
static const unsigned int ROWS = 4;
static const unsigned int COLUMNS = 4;
static const unsigned int PIXELS = ROWS * COLUMNS;
static const float LUMA_WEIGHT;
static const float CHROMA_BLUE_WEIGHT;
typedef enum
{
MODE_UNKNOWN,
//
MODE_ETC1,
MODE_T,
MODE_H,
MODE_PLANAR,
MODE_R11,
MODE_RG11,
//
MODES
} Mode;
Block4x4Encoding(void);
//virtual ~Block4x4Encoding(void) =0;
virtual ~Block4x4Encoding(void) {}
virtual void InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric) = 0;
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric) = 0;
// perform an iteration of the encoding
// the first iteration must generate a complete, valid (if poor) encoding
virtual void PerformIteration(float a_fEffort) = 0;
void CalcBlockError(void);
inline float GetError(void)
{
assert(m_fError >= 0.0f);
return m_fError;
}
inline ColorFloatRGBA * GetDecodedColors(void)
{
return m_afrgbaDecodedColors;
}
inline float * GetDecodedAlphas(void)
{
return m_afDecodedAlphas;
}
virtual void SetEncodingBits(void) = 0;
virtual bool GetFlip(void) = 0;
virtual bool IsDifferential(void) = 0;
virtual bool HasSeverelyBentDifferentialColors(void) const = 0;
inline Mode GetMode(void)
{
return m_mode;
}
inline bool IsDone(void)
{
return m_boolDone;
}
inline void SetDoneIfPerfect()
{
if (GetError() == 0.0f)
{
m_boolDone = true;
}
}
float CalcPixelError(ColorFloatRGBA a_frgbaDecodedColor, float a_fDecodedAlpha,
ColorFloatRGBA a_frgbaSourcePixel);
protected:
void Init(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
Block4x4 *m_pblockParent;
ColorFloatRGBA *m_pafrgbaSource;
bool m_boolBorderPixels; // if block has any border pixels
ColorFloatRGBA m_afrgbaDecodedColors[PIXELS]; // decoded RGB components, ignore Alpha
float m_afDecodedAlphas[PIXELS]; // decoded alpha component
float m_fError; // error for RGBA relative to m_pafrgbaSource
// intermediate encoding
Mode m_mode;
unsigned int m_uiEncodingIterations;
bool m_boolDone; // all iterations have been done
ErrorMetric m_errormetric;
private:
};
} // namespace Etc

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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 <assert.h>
namespace Etc
{
// ################################################################################
// Block4x4EncodingBits
// Base class for Block4x4EncodingBits_XXXX
// ################################################################################
class Block4x4EncodingBits
{
public:
enum class Format
{
UNKNOWN,
//
RGB8,
RGBA8,
R11,
RG11,
RGB8A1,
//
FORMATS
};
static unsigned int GetBytesPerBlock(Format a_format)
{
switch (a_format)
{
case Format::RGB8:
case Format::R11:
case Format::RGB8A1:
return 8;
break;
case Format::RGBA8:
case Format::RG11:
return 16;
break;
default:
return 0;
break;
}
}
};
// ################################################################################
// Block4x4EncodingBits_RGB8
// Encoding bits for the RGB portion of ETC1, RGB8, RGB8A1 and RGBA8
// ################################################################################
class Block4x4EncodingBits_RGB8
{
public:
static const unsigned int BYTES_PER_BLOCK = 8;
inline Block4x4EncodingBits_RGB8(void)
{
assert(sizeof(Block4x4EncodingBits_RGB8) == BYTES_PER_BLOCK);
for (unsigned int uiByte = 0; uiByte < BYTES_PER_BLOCK; uiByte++)
{
auc[uiByte] = 0;
}
}
typedef struct
{
unsigned red2 : 4;
unsigned red1 : 4;
//
unsigned green2 : 4;
unsigned green1 : 4;
//
unsigned blue2 : 4;
unsigned blue1 : 4;
//
unsigned flip : 1;
unsigned diff : 1;
unsigned cw2 : 3;
unsigned cw1 : 3;
//
unsigned int selectors;
} Individual;
typedef struct
{
signed dred2 : 3;
unsigned red1 : 5;
//
signed dgreen2 : 3;
unsigned green1 : 5;
//
signed dblue2 : 3;
unsigned blue1 : 5;
//
unsigned flip : 1;
unsigned diff : 1;
unsigned cw2 : 3;
unsigned cw1 : 3;
//
unsigned int selectors;
} Differential;
typedef struct
{
unsigned red1b : 2;
unsigned detect2 : 1;
unsigned red1a : 2;
unsigned detect1 : 3;
//
unsigned blue1 : 4;
unsigned green1 : 4;
//
unsigned green2 : 4;
unsigned red2 : 4;
//
unsigned db : 1;
unsigned diff : 1;
unsigned da : 2;
unsigned blue2 : 4;
//
unsigned int selectors;
} T;
typedef struct
{
unsigned green1a : 3;
unsigned red1 : 4;
unsigned detect1 : 1;
//
unsigned blue1b : 2;
unsigned detect3 : 1;
unsigned blue1a : 1;
unsigned green1b : 1;
unsigned detect2 : 3;
//
unsigned green2a : 3;
unsigned red2 : 4;
unsigned blue1c : 1;
//
unsigned db : 1;
unsigned diff : 1;
unsigned da : 1;
unsigned blue2 : 4;
unsigned green2b : 1;
//
unsigned int selectors;
} H;
typedef struct
{
unsigned originGreen1 : 1;
unsigned originRed : 6;
unsigned detect1 : 1;
//
unsigned originBlue1 : 1;
unsigned originGreen2 : 6;
unsigned detect2 : 1;
//
unsigned originBlue3 : 2;
unsigned detect4 : 1;
unsigned originBlue2 : 2;
unsigned detect3 : 3;
//
unsigned horizRed2 : 1;
unsigned diff : 1;
unsigned horizRed1 : 5;
unsigned originBlue4 : 1;
//
unsigned horizBlue1: 1;
unsigned horizGreen : 7;
//
unsigned vertRed1 : 3;
unsigned horizBlue2 : 5;
//
unsigned vertGreen1 : 5;
unsigned vertRed2 : 3;
//
unsigned vertBlue : 6;
unsigned vertGreen2 : 2;
} Planar;
union
{
unsigned char auc[BYTES_PER_BLOCK];
unsigned long int ul;
Individual individual;
Differential differential;
T t;
H h;
Planar planar;
};
};
// ################################################################################
// Block4x4EncodingBits_A8
// Encoding bits for the A portion of RGBA8
// ################################################################################
class Block4x4EncodingBits_A8
{
public:
static const unsigned int BYTES_PER_BLOCK = 8;
static const unsigned int SELECTOR_BYTES = 6;
typedef struct
{
unsigned base : 8;
unsigned table : 4;
unsigned multiplier : 4;
unsigned selectors0 : 8;
unsigned selectors1 : 8;
unsigned selectors2 : 8;
unsigned selectors3 : 8;
unsigned selectors4 : 8;
unsigned selectors5 : 8;
} Data;
Data data;
};
// ################################################################################
// Block4x4EncodingBits_R11
// Encoding bits for the R portion of R11
// ################################################################################
class Block4x4EncodingBits_R11
{
public:
static const unsigned int BYTES_PER_BLOCK = 8;
static const unsigned int SELECTOR_BYTES = 6;
typedef struct
{
unsigned base : 8;
unsigned table : 4;
unsigned multiplier : 4;
unsigned selectors0 : 8;
unsigned selectors1 : 8;
unsigned selectors2 : 8;
unsigned selectors3 : 8;
unsigned selectors4 : 8;
unsigned selectors5 : 8;
} Data;
Data data;
};
class Block4x4EncodingBits_RG11
{
public:
static const unsigned int BYTES_PER_BLOCK = 16;
static const unsigned int SELECTOR_BYTES = 12;
typedef struct
{
//Red portion
unsigned baseR : 8;
unsigned tableIndexR : 4;
unsigned multiplierR : 4;
unsigned selectorsR0 : 8;
unsigned selectorsR1 : 8;
unsigned selectorsR2 : 8;
unsigned selectorsR3 : 8;
unsigned selectorsR4 : 8;
unsigned selectorsR5 : 8;
//Green portion
unsigned baseG : 8;
unsigned tableIndexG : 4;
unsigned multiplierG : 4;
unsigned selectorsG0 : 8;
unsigned selectorsG1 : 8;
unsigned selectorsG2 : 8;
unsigned selectorsG3 : 8;
unsigned selectorsG4 : 8;
unsigned selectorsG5 : 8;
} Data;
Data data;
};
}

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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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/*
* 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.
*/
/*
EtcBlock4x4Encoding_R11.cpp
Block4x4Encoding_R11 is the encoder to use when targetting file format R11 and SR11 (signed R11).
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding_R11.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <float.h>
#include <limits>
namespace Etc
{
// modifier values to use for R11, SR11, RG11 and SRG11
float Block4x4Encoding_R11::s_aafModifierTable[MODIFIER_TABLE_ENTRYS][SELECTORS]
{
{ -3.0f / 255.0f, -6.0f / 255.0f, -9.0f / 255.0f, -15.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 8.0f / 255.0f, 14.0f / 255.0f },
{ -3.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, -13.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f, 12.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 12.0f / 255.0f },
{ -2.0f / 255.0f, -4.0f / 255.0f, -6.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 12.0f / 255.0f },
{ -3.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -12.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 11.0f / 255.0f },
{ -3.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f, 10.0f / 255.0f },
{ -4.0f / 255.0f, -7.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
{ -3.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
{ -2.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -4.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
{ -3.0f / 255.0f, -4.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 2.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
{ -1.0f / 255.0f, -2.0f / 255.0f, -3.0f / 255.0f, -10.0f / 255.0f, 0.0f / 255.0f, 1.0f / 255.0f, 2.0f / 255.0f, 9.0f / 255.0f },
{ -4.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -9.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 8.0f / 255.0f },
{ -3.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f }
};
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding_R11::Block4x4Encoding_R11(void)
{
m_pencodingbitsR11 = nullptr;
}
Block4x4Encoding_R11::~Block4x4Encoding_R11(void) {}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits
//
void Block4x4Encoding_R11::InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
{
Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
m_pencodingbitsR11 = (Block4x4EncodingBits_R11 *)a_paucEncodingBits;
}
// ----------------------------------------------------------------------------------------------------
// initialization from the encoding bits of a previous encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits of a previous encoding
//
void Block4x4Encoding_R11::InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pencodingbitsR11 = (Block4x4EncodingBits_R11 *)a_paucEncodingBits;
// init RGB portion
Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
(unsigned char *)m_pencodingbitsR11,
a_pafrgbaSource,
a_errormetric);
// init R11 portion
{
m_mode = MODE_R11;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fRedBase = (float)(signed char)m_pencodingbitsR11->data.base;
}
else
{
m_fRedBase = (float)(unsigned char)m_pencodingbitsR11->data.base;
}
m_fRedMultiplier = (float)m_pencodingbitsR11->data.multiplier;
m_uiRedModifierTableIndex = m_pencodingbitsR11->data.table;
unsigned long long int ulliSelectorBits = 0;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors0 << 40;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors1 << 32;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors2 << 24;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors3 << 16;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors4 << 8;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors5;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
m_auiRedSelectors[uiPixel] = (ulliSelectorBits >> uiShift) & (SELECTORS - 1);
}
// decode the red channel
// calc red error
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fDecodedPixelData = 0.0f;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
fDecodedPixelData = DecodePixelRed(m_fRedBase, m_fRedMultiplier,
m_uiRedModifierTableIndex,
m_auiRedSelectors[uiPixel]);
}
else if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
fDecodedPixelData = DecodePixelRed(m_fRedBase + 128, m_fRedMultiplier,
m_uiRedModifierTableIndex,
m_auiRedSelectors[uiPixel]);
}
else
{
assert(0);
}
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fDecodedPixelData, 0.0f, 0.0f, 1.0f);
}
CalcBlockError();
}
}
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_R11::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
m_mode = MODE_R11;
switch (m_uiEncodingIterations)
{
case 0:
m_fError = FLT_MAX;
m_fRedBlockError = FLT_MAX; // artificially high value
CalculateR11(8, 0.0f, 0.0f);
m_fError = m_fRedBlockError;
break;
case 1:
CalculateR11(8, 2.0f, 1.0f);
m_fError = m_fRedBlockError;
if (a_fEffort <= 24.5f)
{
m_boolDone = true;
}
break;
case 2:
CalculateR11(8, 12.0f, 1.0f);
m_fError = m_fRedBlockError;
if (a_fEffort <= 49.5f)
{
m_boolDone = true;
}
break;
case 3:
CalculateR11(7, 6.0f, 1.0f);
m_fError = m_fRedBlockError;
break;
case 4:
CalculateR11(6, 3.0f, 1.0f);
m_fError = m_fRedBlockError;
break;
case 5:
CalculateR11(5, 1.0f, 0.0f);
m_fError = m_fRedBlockError;
m_boolDone = true;
break;
default:
assert(0);
break;
}
m_uiEncodingIterations++;
SetDoneIfPerfect();
}
// ----------------------------------------------------------------------------------------------------
// find the best combination of base color, multiplier and selectors
//
// a_uiSelectorsUsed limits the number of selector combinations to try
// a_fBaseRadius limits the range of base colors to try
// a_fMultiplierRadius limits the range of multipliers to try
//
void Block4x4Encoding_R11::CalculateR11(unsigned int a_uiSelectorsUsed,
float a_fBaseRadius, float a_fMultiplierRadius)
{
// maps from virtual (monotonic) selector to ETC selector
static const unsigned int auiVirtualSelectorMap[8] = {3, 2, 1, 0, 4, 5, 6, 7};
// find min/max red
float fMinRed = 1.0f;
float fMaxRed = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
// ignore border pixels
float fAlpha = m_pafrgbaSource[uiPixel].fA;
if (isnan(fAlpha))
{
continue;
}
float fRed = m_pafrgbaSource[uiPixel].fR;
if (fRed < fMinRed)
{
fMinRed = fRed;
}
if (fRed > fMaxRed)
{
fMaxRed = fRed;
}
}
assert(fMinRed <= fMaxRed);
float fRedRange = (fMaxRed - fMinRed);
// try each modifier table entry
for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
{
for (unsigned int uiMinVirtualSelector = 0;
uiMinVirtualSelector <= (8- a_uiSelectorsUsed);
uiMinVirtualSelector++)
{
unsigned int uiMaxVirtualSelector = uiMinVirtualSelector + a_uiSelectorsUsed - 1;
unsigned int uiMinSelector = auiVirtualSelectorMap[uiMinVirtualSelector];
unsigned int uiMaxSelector = auiVirtualSelectorMap[uiMaxVirtualSelector];
float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][uiMinSelector];
float fTableEntryRange = s_aafModifierTable[uiTableEntry][uiMaxSelector] -
s_aafModifierTable[uiTableEntry][uiMinSelector];
float fCenterRatio = fTableEntryCenter / fTableEntryRange;
float fCenter = fMinRed + fCenterRatio*fRedRange;
fCenter = roundf(255.0f * fCenter) / 255.0f;
float fMinBase = fCenter - (a_fBaseRadius / 255.0f);
if (fMinBase < 0.0f)
{
fMinBase = 0.0f;
}
float fMaxBase = fCenter + (a_fBaseRadius / 255.0f);
if (fMaxBase > 1.0f)
{
fMaxBase = 1.0f;
}
for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
{
float fRangeMultiplier = roundf(fRedRange / fTableEntryRange);
float fMinMultiplier = fRangeMultiplier - a_fMultiplierRadius;
if (fMinMultiplier < 1.0f)
{
fMinMultiplier = 0.0f;
}
else if (fMinMultiplier > 15.0f)
{
fMinMultiplier = 15.0f;
}
float fMaxMultiplier = fRangeMultiplier + a_fMultiplierRadius;
if (fMaxMultiplier < 1.0f)
{
fMaxMultiplier = 1.0f;
}
else if (fMaxMultiplier > 15.0f)
{
fMaxMultiplier = 15.0f;
}
for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
{
// find best selector for each pixel
unsigned int auiBestSelectors[PIXELS];
float afBestRedError[PIXELS];
float afBestPixelRed[PIXELS];
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fBestPixelRedError = FLT_MAX;
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
{
float fPixelRed = DecodePixelRed(fBase * 255.0f, fMultiplier, uiTableEntry, uiSelector);
ColorFloatRGBA frgba(fPixelRed, m_pafrgbaSource[uiPixel].fG,0.0f,1.0f);
float fPixelRedError = CalcPixelError(frgba, 1.0f, m_pafrgbaSource[uiPixel]);
if (fPixelRedError < fBestPixelRedError)
{
fBestPixelRedError = fPixelRedError;
auiBestSelectors[uiPixel] = uiSelector;
afBestRedError[uiPixel] = fBestPixelRedError;
afBestPixelRed[uiPixel] = fPixelRed;
}
}
}
float fBlockError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
fBlockError += afBestRedError[uiPixel];
}
if (fBlockError < m_fRedBlockError)
{
m_fRedBlockError = fBlockError;
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_fRedBase = 255.0f * fBase;
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fRedBase = (fBase * 255) - 128;
}
else
{
assert(0);
}
m_fRedMultiplier = fMultiplier;
m_uiRedModifierTableIndex = uiTableEntry;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_auiRedSelectors[uiPixel] = auiBestSelectors[uiPixel];
float fBestPixelRed = afBestPixelRed[uiPixel];
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fBestPixelRed, 0.0f, 0.0f, 1.0f);
m_afDecodedAlphas[uiPixel] = 1.0f;
}
}
}
}
}
}
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_R11::SetEncodingBits(void)
{
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_pencodingbitsR11->data.base = (unsigned char)roundf(m_fRedBase);
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_pencodingbitsR11->data.base = (signed char)roundf(m_fRedBase);
}
else
{
assert(0);
}
m_pencodingbitsR11->data.table = m_uiRedModifierTableIndex;
m_pencodingbitsR11->data.multiplier = (unsigned char)roundf(m_fRedMultiplier);
unsigned long long int ulliSelectorBits = 0;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
ulliSelectorBits |= ((unsigned long long int)m_auiRedSelectors[uiPixel]) << uiShift;
}
m_pencodingbitsR11->data.selectors0 = ulliSelectorBits >> 40;
m_pencodingbitsR11->data.selectors1 = ulliSelectorBits >> 32;
m_pencodingbitsR11->data.selectors2 = ulliSelectorBits >> 24;
m_pencodingbitsR11->data.selectors3 = ulliSelectorBits >> 16;
m_pencodingbitsR11->data.selectors4 = ulliSelectorBits >> 8;
m_pencodingbitsR11->data.selectors5 = ulliSelectorBits;
}
// ----------------------------------------------------------------------------------------------------
//
}

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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_RGB8.h"
namespace Etc
{
class Block4x4EncodingBits_R11;
// ################################################################################
// Block4x4Encoding_R11
// ################################################################################
class Block4x4Encoding_R11 : public Block4x4Encoding_RGB8
{
public:
Block4x4Encoding_R11(void);
virtual ~Block4x4Encoding_R11(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);
virtual void SetEncodingBits(void);
inline float GetRedBase(void) const
{
return m_fRedBase;
}
inline float GetRedMultiplier(void) const
{
return m_fRedMultiplier;
}
inline int GetRedTableIndex(void) const
{
return m_uiRedModifierTableIndex;
}
inline const unsigned int * GetRedSelectors(void) const
{
return m_auiRedSelectors;
}
protected:
static const unsigned int MODIFIER_TABLE_ENTRYS = 16;
static const unsigned int SELECTOR_BITS = 3;
static const unsigned int SELECTORS = 1 << SELECTOR_BITS;
static float s_aafModifierTable[MODIFIER_TABLE_ENTRYS][SELECTORS];
void CalculateR11(unsigned int a_uiSelectorsUsed,
float a_fBaseRadius, float a_fMultiplierRadius);
inline float DecodePixelRed(float a_fBase, float a_fMultiplier,
unsigned int a_uiTableIndex, unsigned int a_uiSelector)
{
float fMultiplier = a_fMultiplier;
if (fMultiplier <= 0.0f)
{
fMultiplier = 1.0f / 8.0f;
}
float fPixelRed = a_fBase * 8 + 4 +
8 * fMultiplier*s_aafModifierTable[a_uiTableIndex][a_uiSelector]*255;
fPixelRed /= 2047.0f;
if (fPixelRed < 0.0f)
{
fPixelRed = 0.0f;
}
else if (fPixelRed > 1.0f)
{
fPixelRed = 1.0f;
}
return fPixelRed;
}
Block4x4EncodingBits_R11 *m_pencodingbitsR11;
float m_fRedBase;
float m_fRedMultiplier;
float m_fRedBlockError;
unsigned int m_uiRedModifierTableIndex;
unsigned int m_auiRedSelectors[PIXELS];
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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.
*/
/*
EtcBlock4x4Encoding_RG11.cpp
Block4x4Encoding_RG11 is the encoder to use when targetting file format RG11 and SRG11 (signed RG11).
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding_RG11.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <float.h>
#include <limits>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding_RG11::Block4x4Encoding_RG11(void)
{
m_pencodingbitsRG11 = nullptr;
}
Block4x4Encoding_RG11::~Block4x4Encoding_RG11(void) {}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits
//
void Block4x4Encoding_RG11::InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
{
Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
m_pencodingbitsRG11 = (Block4x4EncodingBits_RG11 *)a_paucEncodingBits;
}
// ----------------------------------------------------------------------------------------------------
// initialization from the encoding bits of a previous encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits of a previous encoding
//
void Block4x4Encoding_RG11::InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pencodingbitsRG11 = (Block4x4EncodingBits_RG11 *)a_paucEncodingBits;
// init RGB portion
Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
(unsigned char *)m_pencodingbitsRG11,
a_pafrgbaSource,
a_errormetric);
m_fError = 0.0f;
{
m_mode = MODE_RG11;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fRedBase = (float)(signed char)m_pencodingbitsRG11->data.baseR;
m_fGrnBase = (float)(signed char)m_pencodingbitsRG11->data.baseG;
}
else
{
m_fRedBase = (float)(unsigned char)m_pencodingbitsRG11->data.baseR;
m_fGrnBase = (float)(unsigned char)m_pencodingbitsRG11->data.baseG;
}
m_fRedMultiplier = (float)m_pencodingbitsRG11->data.multiplierR;
m_fGrnMultiplier = (float)m_pencodingbitsRG11->data.multiplierG;
m_uiRedModifierTableIndex = m_pencodingbitsRG11->data.tableIndexR;
m_uiGrnModifierTableIndex = m_pencodingbitsRG11->data.tableIndexG;
unsigned long long int ulliSelectorBitsR = 0;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR0 << 40;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR1 << 32;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR2 << 24;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR3 << 16;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR4 << 8;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR5;
unsigned long long int ulliSelectorBitsG = 0;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG0 << 40;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG1 << 32;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG2 << 24;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG3 << 16;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG4 << 8;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG5;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
m_auiRedSelectors[uiPixel] = (ulliSelectorBitsR >> uiShift) & (SELECTORS - 1);
m_auiGrnSelectors[uiPixel] = (ulliSelectorBitsG >> uiShift) & (SELECTORS - 1);
}
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fRedDecodedData = 0.0f;
float fGrnDecodedData = 0.0f;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
fRedDecodedData = DecodePixelRed(m_fRedBase, m_fRedMultiplier, m_uiRedModifierTableIndex, m_auiRedSelectors[uiPixel]);
fGrnDecodedData = DecodePixelRed(m_fGrnBase, m_fGrnMultiplier, m_uiGrnModifierTableIndex, m_auiGrnSelectors[uiPixel]);
}
else if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
fRedDecodedData = DecodePixelRed(m_fRedBase + 128, m_fRedMultiplier, m_uiRedModifierTableIndex, m_auiRedSelectors[uiPixel]);
fGrnDecodedData = DecodePixelRed(m_fGrnBase + 128, m_fGrnMultiplier, m_uiGrnModifierTableIndex, m_auiGrnSelectors[uiPixel]);
}
else
{
assert(0);
}
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fRedDecodedData, fGrnDecodedData, 0.0f, 1.0f);
}
}
CalcBlockError();
}
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_RG11::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
switch (m_uiEncodingIterations)
{
case 0:
m_fError = FLT_MAX;
m_fGrnBlockError = FLT_MAX; // artificially high value
m_fRedBlockError = FLT_MAX;
CalculateR11(8, 0.0f, 0.0f);
CalculateG11(8, 0.0f, 0.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 1:
CalculateR11(8, 2.0f, 1.0f);
CalculateG11(8, 2.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
if (a_fEffort <= 24.5f)
{
m_boolDone = true;
}
break;
case 2:
CalculateR11(8, 12.0f, 1.0f);
CalculateG11(8, 12.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
if (a_fEffort <= 49.5f)
{
m_boolDone = true;
}
break;
case 3:
CalculateR11(7, 6.0f, 1.0f);
CalculateG11(7, 6.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 4:
CalculateR11(6, 3.0f, 1.0f);
CalculateG11(6, 3.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 5:
CalculateR11(5, 1.0f, 0.0f);
CalculateG11(5, 1.0f, 0.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
m_boolDone = true;
break;
default:
assert(0);
break;
}
m_uiEncodingIterations++;
SetDoneIfPerfect();
}
// ----------------------------------------------------------------------------------------------------
// find the best combination of base color, multiplier and selectors
//
// a_uiSelectorsUsed limits the number of selector combinations to try
// a_fBaseRadius limits the range of base colors to try
// a_fMultiplierRadius limits the range of multipliers to try
//
void Block4x4Encoding_RG11::CalculateG11(unsigned int a_uiSelectorsUsed,
float a_fBaseRadius, float a_fMultiplierRadius)
{
// maps from virtual (monotonic) selector to etc selector
static const unsigned int auiVirtualSelectorMap[8] = { 3, 2, 1, 0, 4, 5, 6, 7 };
// find min/max Grn
float fMinGrn = 1.0f;
float fMaxGrn = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
// ignore border pixels
float fAlpha = m_pafrgbaSource[uiPixel].fA;
if (isnan(fAlpha))
{
continue;
}
float fGrn = m_pafrgbaSource[uiPixel].fG;
if (fGrn < fMinGrn)
{
fMinGrn = fGrn;
}
if (fGrn > fMaxGrn)
{
fMaxGrn = fGrn;
}
}
assert(fMinGrn <= fMaxGrn);
float fGrnRange = (fMaxGrn - fMinGrn);
// try each modifier table entry
for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
{
for (unsigned int uiMinVirtualSelector = 0;
uiMinVirtualSelector <= (8 - a_uiSelectorsUsed);
uiMinVirtualSelector++)
{
unsigned int uiMaxVirtualSelector = uiMinVirtualSelector + a_uiSelectorsUsed - 1;
unsigned int uiMinSelector = auiVirtualSelectorMap[uiMinVirtualSelector];
unsigned int uiMaxSelector = auiVirtualSelectorMap[uiMaxVirtualSelector];
float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][uiMinSelector];
float fTableEntryRange = s_aafModifierTable[uiTableEntry][uiMaxSelector] -
s_aafModifierTable[uiTableEntry][uiMinSelector];
float fCenterRatio = fTableEntryCenter / fTableEntryRange;
float fCenter = fMinGrn + fCenterRatio*fGrnRange;
fCenter = roundf(255.0f * fCenter) / 255.0f;
float fMinBase = fCenter - (a_fBaseRadius / 255.0f);
if (fMinBase < 0.0f)
{
fMinBase = 0.0f;
}
float fMaxBase = fCenter + (a_fBaseRadius / 255.0f);
if (fMaxBase > 1.0f)
{
fMaxBase = 1.0f;
}
for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
{
float fRangeMultiplier = roundf(fGrnRange / fTableEntryRange);
float fMinMultiplier = fRangeMultiplier - a_fMultiplierRadius;
if (fMinMultiplier < 1.0f)
{
fMinMultiplier = 0.0f;
}
else if (fMinMultiplier > 15.0f)
{
fMinMultiplier = 15.0f;
}
float fMaxMultiplier = fRangeMultiplier + a_fMultiplierRadius;
if (fMaxMultiplier < 1.0f)
{
fMaxMultiplier = 1.0f;
}
else if (fMaxMultiplier > 15.0f)
{
fMaxMultiplier = 15.0f;
}
for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
{
// find best selector for each pixel
unsigned int auiBestSelectors[PIXELS];
float afBestGrnError[PIXELS];
float afBestPixelGrn[PIXELS];
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fBestPixelGrnError = FLT_MAX;
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
{
//DecodePixelRed is not red channel specific
float fPixelGrn = DecodePixelRed(fBase * 255.0f, fMultiplier, uiTableEntry, uiSelector);
ColorFloatRGBA frgba(m_pafrgbaSource[uiPixel].fR, fPixelGrn, 0.0f, 1.0f);
float fPixelGrnError = CalcPixelError(frgba, 1.0f, m_pafrgbaSource[uiPixel]);
if (fPixelGrnError < fBestPixelGrnError)
{
fBestPixelGrnError = fPixelGrnError;
auiBestSelectors[uiPixel] = uiSelector;
afBestGrnError[uiPixel] = fBestPixelGrnError;
afBestPixelGrn[uiPixel] = fPixelGrn;
}
}
}
float fBlockError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
fBlockError += afBestGrnError[uiPixel];
}
if (fBlockError < m_fGrnBlockError)
{
m_fGrnBlockError = fBlockError;
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_fGrnBase = 255.0f * fBase;
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fGrnBase = (fBase * 255) - 128;
}
else
{
assert(0);
}
m_fGrnMultiplier = fMultiplier;
m_uiGrnModifierTableIndex = uiTableEntry;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_auiGrnSelectors[uiPixel] = auiBestSelectors[uiPixel];
m_afrgbaDecodedColors[uiPixel].fG = afBestPixelGrn[uiPixel];
m_afDecodedAlphas[uiPixel] = 1.0f;
}
}
}
}
}
}
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RG11::SetEncodingBits(void)
{
unsigned long long int ulliSelectorBitsR = 0;
unsigned long long int ulliSelectorBitsG = 0;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
ulliSelectorBitsR |= ((unsigned long long int)m_auiRedSelectors[uiPixel]) << uiShift;
ulliSelectorBitsG |= ((unsigned long long int)m_auiGrnSelectors[uiPixel]) << uiShift;
}
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_pencodingbitsRG11->data.baseR = (unsigned char)roundf(m_fRedBase);
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_pencodingbitsRG11->data.baseR = (signed char)roundf(m_fRedBase);
}
else
{
assert(0);
}
m_pencodingbitsRG11->data.tableIndexR = m_uiRedModifierTableIndex;
m_pencodingbitsRG11->data.multiplierR = (unsigned char)roundf(m_fRedMultiplier);
m_pencodingbitsRG11->data.selectorsR0 = ulliSelectorBitsR >> 40;
m_pencodingbitsRG11->data.selectorsR1 = ulliSelectorBitsR >> 32;
m_pencodingbitsRG11->data.selectorsR2 = ulliSelectorBitsR >> 24;
m_pencodingbitsRG11->data.selectorsR3 = ulliSelectorBitsR >> 16;
m_pencodingbitsRG11->data.selectorsR4 = ulliSelectorBitsR >> 8;
m_pencodingbitsRG11->data.selectorsR5 = ulliSelectorBitsR;
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_pencodingbitsRG11->data.baseG = (unsigned char)roundf(m_fGrnBase);
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_pencodingbitsRG11->data.baseG = (signed char)roundf(m_fGrnBase);
}
else
{
assert(0);
}
m_pencodingbitsRG11->data.tableIndexG = m_uiGrnModifierTableIndex;
m_pencodingbitsRG11->data.multiplierG = (unsigned char)roundf(m_fGrnMultiplier);
m_pencodingbitsRG11->data.selectorsG0 = ulliSelectorBitsG >> 40;
m_pencodingbitsRG11->data.selectorsG1 = ulliSelectorBitsG >> 32;
m_pencodingbitsRG11->data.selectorsG2 = ulliSelectorBitsG >> 24;
m_pencodingbitsRG11->data.selectorsG3 = ulliSelectorBitsG >> 16;
m_pencodingbitsRG11->data.selectorsG4 = ulliSelectorBitsG >> 8;
m_pencodingbitsRG11->data.selectorsG5 = ulliSelectorBitsG;
}
// ----------------------------------------------------------------------------------------------------
//
}

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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_RGB8.h"
#include "EtcBlock4x4Encoding_R11.h"
namespace Etc
{
class Block4x4EncodingBits_RG11;
// ################################################################################
// Block4x4Encoding_RG11
// ################################################################################
class Block4x4Encoding_RG11 : public Block4x4Encoding_R11
{
float m_fGrnBase;
float m_fGrnMultiplier;
float m_fGrnBlockError;
unsigned int m_auiGrnSelectors[PIXELS];
unsigned int m_uiGrnModifierTableIndex;
public:
Block4x4Encoding_RG11(void);
virtual ~Block4x4Encoding_RG11(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);
virtual void SetEncodingBits(void);
Block4x4EncodingBits_RG11 *m_pencodingbitsRG11;
void CalculateG11(unsigned int a_uiSelectorsUsed, float a_fBaseRadius, float a_fMultiplierRadius);
inline float GetGrnBase(void) const
{
return m_fGrnBase;
}
inline float GetGrnMultiplier(void) const
{
return m_fGrnMultiplier;
}
inline int GetGrnTableIndex(void) const
{
return m_uiGrnModifierTableIndex;
}
inline const unsigned int * GetGrnSelectors(void) const
{
return m_auiGrnSelectors;
}
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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_ETC1.h"
namespace Etc
{
class Block4x4Encoding_RGB8 : public Block4x4Encoding_ETC1
{
public:
Block4x4Encoding_RGB8(void);
virtual ~Block4x4Encoding_RGB8(void);
virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
inline ColorFloatRGBA GetColor3(void) const
{
return m_frgbaColor3;
}
protected:
static const unsigned int PLANAR_CORNER_COLORS = 3;
static const unsigned int MAX_PLANAR_REGRESSION_SIZE = 4;
static const unsigned int TH_DISTANCES = 8;
static float s_afTHDistanceTable[TH_DISTANCES];
void TryPlanar(unsigned int a_uiRadius);
void TryTAndH(unsigned int a_uiRadius);
void InitFromEncodingBits_Planar(void);
ColorFloatRGBA m_frgbaColor3; // used for planar
void SetEncodingBits_T(void);
void SetEncodingBits_H(void);
void SetEncodingBits_Planar(void);
// state shared between iterations
ColorFloatRGBA m_frgbaOriginalColor1_TAndH;
ColorFloatRGBA m_frgbaOriginalColor2_TAndH;
void CalculateBaseColorsForTAndH(void);
void TryT(unsigned int a_uiRadius);
void TryT_BestSelectorCombination(void);
void TryH(unsigned int a_uiRadius);
void TryH_BestSelectorCombination(void);
private:
void InitFromEncodingBits_T(void);
void InitFromEncodingBits_H(void);
void CalculatePlanarCornerColors(void);
void ColorRegression(ColorFloatRGBA *a_pafrgbaPixels, unsigned int a_uiPixels,
ColorFloatRGBA *a_pfrgbaSlope, ColorFloatRGBA *a_pfrgbaOffset);
bool TwiddlePlanar(void);
bool TwiddlePlanarR();
bool TwiddlePlanarG();
bool TwiddlePlanarB();
void DecodePixels_T(void);
void DecodePixels_H(void);
void DecodePixels_Planar(void);
};
} // namespace Etc

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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_RGB8.h"
#include "EtcErrorMetric.h"
#include "EtcBlock4x4EncodingBits.h"
namespace Etc
{
// ################################################################################
// Block4x4Encoding_RGB8A1
// RGB8A1 if not completely opaque or transparent
// ################################################################################
class Block4x4Encoding_RGB8A1 : public Block4x4Encoding_RGB8
{
public:
static const unsigned int TRANSPARENT_SELECTOR = 2;
Block4x4Encoding_RGB8A1(void);
virtual ~Block4x4Encoding_RGB8A1(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);
virtual void SetEncodingBits(void);
void InitFromEncodingBits_ETC1(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric);
void InitFromEncodingBits_T(void);
void InitFromEncodingBits_H(void);
void PerformFirstIteration(void);
void Decode_ETC1(void);
void DecodePixels_T(void);
void DecodePixels_H(void);
void SetEncodingBits_ETC1(void);
void SetEncodingBits_T(void);
void SetEncodingBits_H(void);
protected:
bool m_boolOpaque; // all source pixels have alpha >= 0.5
bool m_boolTransparent; // all source pixels have alpha < 0.5
bool m_boolPunchThroughPixels; // some source pixels have alpha < 0.5
static float s_aafCwOpaqueUnsetTable[CW_RANGES][SELECTORS];
private:
void TryDifferential(bool a_boolFlip, unsigned int a_uiRadius,
int a_iGrayOffset1, int a_iGrayOffset2);
void TryDifferentialHalf(DifferentialTrys::Half *a_phalf);
void TryT(unsigned int a_uiRadius);
void TryT_BestSelectorCombination(void);
void TryH(unsigned int a_uiRadius);
void TryH_BestSelectorCombination(void);
void TryDegenerates1(void);
void TryDegenerates2(void);
void TryDegenerates3(void);
void TryDegenerates4(void);
};
// ################################################################################
// Block4x4Encoding_RGB8A1_Opaque
// RGB8A1 if all pixels have alpha==1
// ################################################################################
class Block4x4Encoding_RGB8A1_Opaque : public Block4x4Encoding_RGB8A1
{
public:
virtual void PerformIteration(float a_fEffort);
void PerformFirstIteration(void);
private:
};
// ################################################################################
// Block4x4Encoding_RGB8A1_Transparent
// RGB8A1 if all pixels have alpha==0
// ################################################################################
class Block4x4Encoding_RGB8A1_Transparent : public Block4x4Encoding_RGB8A1
{
public:
virtual void PerformIteration(float a_fEffort);
private:
};
} // namespace Etc

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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.
*/
/*
EtcBlock4x4Encoding_RGBA8.cpp contains:
Block4x4Encoding_RGBA8
Block4x4Encoding_RGBA8_Opaque
Block4x4Encoding_RGBA8_Transparent
These encoders are used when targetting file format RGBA8.
Block4x4Encoding_RGBA8_Opaque is used when all pixels in the 4x4 block are opaque
Block4x4Encoding_RGBA8_Transparent is used when all pixels in the 4x4 block are transparent
Block4x4Encoding_RGBA8 is used when there is a mixture of alphas in the 4x4 block
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding_RGBA8.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <float.h>
#include <limits>
namespace Etc
{
// ####################################################################################################
// Block4x4Encoding_RGBA8
// ####################################################################################################
float Block4x4Encoding_RGBA8::s_aafModifierTable[MODIFIER_TABLE_ENTRYS][ALPHA_SELECTORS]
{
{ -3.0f / 255.0f, -6.0f / 255.0f, -9.0f / 255.0f, -15.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 8.0f / 255.0f, 14.0f / 255.0f },
{ -3.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, -13.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f, 12.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 12.0f / 255.0f },
{ -2.0f / 255.0f, -4.0f / 255.0f, -6.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 12.0f / 255.0f },
{ -3.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -12.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 11.0f / 255.0f },
{ -3.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f, 10.0f / 255.0f },
{ -4.0f / 255.0f, -7.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
{ -3.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
{ -2.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -4.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
{ -2.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
{ -3.0f / 255.0f, -4.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 2.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
{ -1.0f / 255.0f, -2.0f / 255.0f, -3.0f / 255.0f, -10.0f / 255.0f, 0.0f / 255.0f, 1.0f / 255.0f, 2.0f / 255.0f, 9.0f / 255.0f },
{ -4.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -9.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 8.0f / 255.0f },
{ -3.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f }
};
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding_RGBA8::Block4x4Encoding_RGBA8(void)
{
m_pencodingbitsA8 = nullptr;
}
Block4x4Encoding_RGBA8::~Block4x4Encoding_RGBA8(void) {}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits
//
void Block4x4Encoding_RGBA8::InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
{
Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
m_pencodingbitsA8 = (Block4x4EncodingBits_A8 *)a_paucEncodingBits;
m_pencodingbitsRGB8 = (Block4x4EncodingBits_RGB8 *)(a_paucEncodingBits + sizeof(Block4x4EncodingBits_A8));
}
// ----------------------------------------------------------------------------------------------------
// initialization from the encoding bits of a previous encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits of a previous encoding
//
void Block4x4Encoding_RGBA8::InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pencodingbitsA8 = (Block4x4EncodingBits_A8 *)a_paucEncodingBits;
m_pencodingbitsRGB8 = (Block4x4EncodingBits_RGB8 *)(a_paucEncodingBits + sizeof(Block4x4EncodingBits_A8));
// init RGB portion
Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
(unsigned char *) m_pencodingbitsRGB8,
a_pafrgbaSource,
a_errormetric);
// init A8 portion
// has to be done after InitFromEncodingBits()
{
m_fBase = m_pencodingbitsA8->data.base / 255.0f;
m_fMultiplier = (float)m_pencodingbitsA8->data.multiplier;
m_uiModifierTableIndex = m_pencodingbitsA8->data.table;
unsigned long long int ulliSelectorBits = 0;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors0 << 40;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors1 << 32;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors2 << 24;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors3 << 16;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors4 << 8;
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors5;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
m_auiAlphaSelectors[uiPixel] = (ulliSelectorBits >> uiShift) & (ALPHA_SELECTORS - 1);
}
// decode the alphas
// calc alpha error
m_fError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afDecodedAlphas[uiPixel] = DecodePixelAlpha(m_fBase, m_fMultiplier,
m_uiModifierTableIndex,
m_auiAlphaSelectors[uiPixel]);
float fDeltaAlpha = m_afDecodedAlphas[uiPixel] - m_pafrgbaSource[uiPixel].fA;
m_fError += fDeltaAlpha * fDeltaAlpha;
}
}
// redo error calc to include alpha
CalcBlockError();
}
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
// similar to Block4x4Encoding_RGB8_Base::Encode_RGB8(), but with alpha added
//
void Block4x4Encoding_RGBA8::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
if (m_uiEncodingIterations == 0)
{
if (a_fEffort < 24.9f)
{
CalculateA8(0.0f);
}
else if (a_fEffort < 49.9f)
{
CalculateA8(1.0f);
}
else
{
CalculateA8(2.0f);
}
}
Block4x4Encoding_RGB8::PerformIteration(a_fEffort);
}
// ----------------------------------------------------------------------------------------------------
// find the best combination of base alpga, multiplier and selectors
//
// a_fRadius limits the range of base alpha to try
//
void Block4x4Encoding_RGBA8::CalculateA8(float a_fRadius)
{
// find min/max alpha
float fMinAlpha = 1.0f;
float fMaxAlpha = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fAlpha = m_pafrgbaSource[uiPixel].fA;
// ignore border pixels
if (isnan(fAlpha))
{
continue;
}
if (fAlpha < fMinAlpha)
{
fMinAlpha = fAlpha;
}
if (fAlpha > fMaxAlpha)
{
fMaxAlpha = fAlpha;
}
}
assert(fMinAlpha <= fMaxAlpha);
float fAlphaRange = fMaxAlpha - fMinAlpha;
// try each modifier table entry
m_fError = FLT_MAX; // artificially high value
for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
{
static const unsigned int MIN_VALUE_SELECTOR = 3;
static const unsigned int MAX_VALUE_SELECTOR = 7;
float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][MIN_VALUE_SELECTOR];
float fTableEntryRange = s_aafModifierTable[uiTableEntry][MAX_VALUE_SELECTOR] -
s_aafModifierTable[uiTableEntry][MIN_VALUE_SELECTOR];
float fCenterRatio = fTableEntryCenter / fTableEntryRange;
float fCenter = fMinAlpha + fCenterRatio*fAlphaRange;
fCenter = roundf(255.0f * fCenter) / 255.0f;
float fMinBase = fCenter - (a_fRadius / 255.0f);
if (fMinBase < 0.0f)
{
fMinBase = 0.0f;
}
float fMaxBase = fCenter + (a_fRadius / 255.0f);
if (fMaxBase > 1.0f)
{
fMaxBase = 1.0f;
}
for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
{
float fRangeMultiplier = roundf(fAlphaRange / fTableEntryRange);
float fMinMultiplier = fRangeMultiplier - a_fRadius;
if (fMinMultiplier < 1.0f)
{
fMinMultiplier = 1.0f;
}
else if (fMinMultiplier > 15.0f)
{
fMinMultiplier = 15.0f;
}
float fMaxMultiplier = fRangeMultiplier + a_fRadius;
if (fMaxMultiplier < 1.0f)
{
fMaxMultiplier = 1.0f;
}
else if (fMaxMultiplier > 15.0f)
{
fMaxMultiplier = 15.0f;
}
for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
{
// find best selector for each pixel
unsigned int auiBestSelectors[PIXELS];
float afBestAlphaError[PIXELS];
float afBestDecodedAlphas[PIXELS];
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fBestPixelAlphaError = FLT_MAX;
for (unsigned int uiSelector = 0; uiSelector < ALPHA_SELECTORS; uiSelector++)
{
float fDecodedAlpha = DecodePixelAlpha(fBase, fMultiplier, uiTableEntry, uiSelector);
// border pixels (NAN) should have zero error
float fPixelDeltaAlpha = isnan(m_pafrgbaSource[uiPixel].fA) ?
0.0f :
fDecodedAlpha - m_pafrgbaSource[uiPixel].fA;
float fPixelAlphaError = fPixelDeltaAlpha * fPixelDeltaAlpha;
if (fPixelAlphaError < fBestPixelAlphaError)
{
fBestPixelAlphaError = fPixelAlphaError;
auiBestSelectors[uiPixel] = uiSelector;
afBestAlphaError[uiPixel] = fBestPixelAlphaError;
afBestDecodedAlphas[uiPixel] = fDecodedAlpha;
}
}
}
float fBlockError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
fBlockError += afBestAlphaError[uiPixel];
}
if (fBlockError < m_fError)
{
m_fError = fBlockError;
m_fBase = fBase;
m_fMultiplier = fMultiplier;
m_uiModifierTableIndex = uiTableEntry;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_auiAlphaSelectors[uiPixel] = auiBestSelectors[uiPixel];
m_afDecodedAlphas[uiPixel] = afBestDecodedAlphas[uiPixel];
}
}
}
}
}
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RGBA8::SetEncodingBits(void)
{
// set the RGB8 portion
Block4x4Encoding_RGB8::SetEncodingBits();
// set the A8 portion
{
m_pencodingbitsA8->data.base = (unsigned char)roundf(255.0f * m_fBase);
m_pencodingbitsA8->data.table = m_uiModifierTableIndex;
m_pencodingbitsA8->data.multiplier = (unsigned char)roundf(m_fMultiplier);
unsigned long long int ulliSelectorBits = 0;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
ulliSelectorBits |= ((unsigned long long int)m_auiAlphaSelectors[uiPixel]) << uiShift;
}
m_pencodingbitsA8->data.selectors0 = ulliSelectorBits >> 40;
m_pencodingbitsA8->data.selectors1 = ulliSelectorBits >> 32;
m_pencodingbitsA8->data.selectors2 = ulliSelectorBits >> 24;
m_pencodingbitsA8->data.selectors3 = ulliSelectorBits >> 16;
m_pencodingbitsA8->data.selectors4 = ulliSelectorBits >> 8;
m_pencodingbitsA8->data.selectors5 = ulliSelectorBits;
}
}
// ####################################################################################################
// Block4x4Encoding_RGBA8_Opaque
// ####################################################################################################
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_RGBA8_Opaque::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
if (m_uiEncodingIterations == 0)
{
m_fError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afDecodedAlphas[uiPixel] = 1.0f;
}
}
Block4x4Encoding_RGB8::PerformIteration(a_fEffort);
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RGBA8_Opaque::SetEncodingBits(void)
{
// set the RGB8 portion
Block4x4Encoding_RGB8::SetEncodingBits();
// set the A8 portion
m_pencodingbitsA8->data.base = 255;
m_pencodingbitsA8->data.table = 15;
m_pencodingbitsA8->data.multiplier = 15;
m_pencodingbitsA8->data.selectors0 = 0xFF;
m_pencodingbitsA8->data.selectors1 = 0xFF;
m_pencodingbitsA8->data.selectors2 = 0xFF;
m_pencodingbitsA8->data.selectors3 = 0xFF;
m_pencodingbitsA8->data.selectors4 = 0xFF;
m_pencodingbitsA8->data.selectors5 = 0xFF;
}
// ####################################################################################################
// Block4x4Encoding_RGBA8_Transparent
// ####################################################################################################
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_RGBA8_Transparent::PerformIteration(float )
{
assert(!m_boolDone);
assert(m_uiEncodingIterations == 0);
m_mode = MODE_ETC1;
m_boolDiff = true;
m_boolFlip = false;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA();
m_afDecodedAlphas[uiPixel] = 0.0f;
}
m_fError = 0.0f;
m_boolDone = true;
m_uiEncodingIterations++;
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RGBA8_Transparent::SetEncodingBits(void)
{
Block4x4Encoding_RGB8::SetEncodingBits();
// set the A8 portion
m_pencodingbitsA8->data.base = 0;
m_pencodingbitsA8->data.table = 0;
m_pencodingbitsA8->data.multiplier = 1;
m_pencodingbitsA8->data.selectors0 = 0;
m_pencodingbitsA8->data.selectors1 = 0;
m_pencodingbitsA8->data.selectors2 = 0;
m_pencodingbitsA8->data.selectors3 = 0;
m_pencodingbitsA8->data.selectors4 = 0;
m_pencodingbitsA8->data.selectors5 = 0;
}
// ----------------------------------------------------------------------------------------------------
//
}

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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_RGB8.h"
namespace Etc
{
class Block4x4EncodingBits_A8;
// ################################################################################
// Block4x4Encoding_RGBA8
// RGBA8 if not completely opaque or transparent
// ################################################################################
class Block4x4Encoding_RGBA8 : public Block4x4Encoding_RGB8
{
public:
Block4x4Encoding_RGBA8(void);
virtual ~Block4x4Encoding_RGBA8(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);
virtual void SetEncodingBits(void);
protected:
static const unsigned int MODIFIER_TABLE_ENTRYS = 16;
static const unsigned int ALPHA_SELECTOR_BITS = 3;
static const unsigned int ALPHA_SELECTORS = 1 << ALPHA_SELECTOR_BITS;
static float s_aafModifierTable[MODIFIER_TABLE_ENTRYS][ALPHA_SELECTORS];
void CalculateA8(float a_fRadius);
Block4x4EncodingBits_A8 *m_pencodingbitsA8; // A8 portion of Block4x4EncodingBits_RGBA8
float m_fBase;
float m_fMultiplier;
unsigned int m_uiModifierTableIndex;
unsigned int m_auiAlphaSelectors[PIXELS];
private:
inline float DecodePixelAlpha(float a_fBase, float a_fMultiplier,
unsigned int a_uiTableIndex, unsigned int a_uiSelector)
{
float fPixelAlpha = a_fBase +
a_fMultiplier*s_aafModifierTable[a_uiTableIndex][a_uiSelector];
if (fPixelAlpha < 0.0f)
{
fPixelAlpha = 0.0f;
}
else if (fPixelAlpha > 1.0f)
{
fPixelAlpha = 1.0f;
}
return fPixelAlpha;
}
};
// ################################################################################
// Block4x4Encoding_RGBA8_Opaque
// RGBA8 if all pixels have alpha==1
// ################################################################################
class Block4x4Encoding_RGBA8_Opaque : public Block4x4Encoding_RGBA8
{
public:
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
};
// ################################################################################
// Block4x4Encoding_RGBA8_Transparent
// RGBA8 if all pixels have alpha==0
// ################################################################################
class Block4x4Encoding_RGBA8_Transparent : public Block4x4Encoding_RGBA8
{
public:
virtual void PerformIteration(float a_fEffort);
virtual void SetEncodingBits(void);
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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.
*/
/*
EtcDifferentialTrys.cpp
Gathers the results of the various encoding trys for both halves of a 4x4 block for Differential mode
*/
#include "EtcConfig.h"
#include "EtcDifferentialTrys.h"
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// construct a list of trys (encoding attempts)
//
// a_frgbaColor1 is the basecolor for the first half
// a_frgbaColor2 is the basecolor for the second half
// a_pauiPixelMapping1 is the pixel order for the first half
// a_pauiPixelMapping2 is the pixel order for the second half
// a_uiRadius is the amount to vary the base colors
//
DifferentialTrys::DifferentialTrys(ColorFloatRGBA a_frgbaColor1, ColorFloatRGBA a_frgbaColor2,
const unsigned int *a_pauiPixelMapping1,
const unsigned int *a_pauiPixelMapping2,
unsigned int a_uiRadius,
int a_iGrayOffset1, int a_iGrayOffset2)
{
assert(a_uiRadius <= MAX_RADIUS);
m_boolSeverelyBentColors = false;
ColorFloatRGBA frgbaQuantizedColor1 = a_frgbaColor1.QuantizeR5G5B5();
ColorFloatRGBA frgbaQuantizedColor2 = a_frgbaColor2.QuantizeR5G5B5();
// quantize base colors
// ensure that trys with a_uiRadius don't overflow
int iRed1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntRed(31.0f)+a_iGrayOffset1, a_uiRadius);
int iGreen1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntGreen(31.0f) + a_iGrayOffset1, a_uiRadius);
int iBlue1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntBlue(31.0f) + a_iGrayOffset1, a_uiRadius);
int iRed2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntRed(31.0f) + a_iGrayOffset2, a_uiRadius);
int iGreen2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntGreen(31.0f) + a_iGrayOffset2, a_uiRadius);
int iBlue2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntBlue(31.0f) + a_iGrayOffset2, a_uiRadius);
int iDeltaRed = iRed2 - iRed1;
int iDeltaGreen = iGreen2 - iGreen1;
int iDeltaBlue = iBlue2 - iBlue1;
// make sure components are within range
{
if (iDeltaRed > 3)
{
if (iDeltaRed > 7)
{
m_boolSeverelyBentColors = true;
}
iRed1 += (iDeltaRed - 3) / 2;
iRed2 = iRed1 + 3;
iDeltaRed = 3;
}
else if (iDeltaRed < -4)
{
if (iDeltaRed < -8)
{
m_boolSeverelyBentColors = true;
}
iRed1 += (iDeltaRed + 4) / 2;
iRed2 = iRed1 - 4;
iDeltaRed = -4;
}
assert(iRed1 >= (signed)(0 + a_uiRadius) && iRed1 <= (signed)(31 - a_uiRadius));
assert(iRed2 >= (signed)(0 + a_uiRadius) && iRed2 <= (signed)(31 - a_uiRadius));
assert(iDeltaRed >= -4 && iDeltaRed <= 3);
if (iDeltaGreen > 3)
{
if (iDeltaGreen > 7)
{
m_boolSeverelyBentColors = true;
}
iGreen1 += (iDeltaGreen - 3) / 2;
iGreen2 = iGreen1 + 3;
iDeltaGreen = 3;
}
else if (iDeltaGreen < -4)
{
if (iDeltaGreen < -8)
{
m_boolSeverelyBentColors = true;
}
iGreen1 += (iDeltaGreen + 4) / 2;
iGreen2 = iGreen1 - 4;
iDeltaGreen = -4;
}
assert(iGreen1 >= (signed)(0 + a_uiRadius) && iGreen1 <= (signed)(31 - a_uiRadius));
assert(iGreen2 >= (signed)(0 + a_uiRadius) && iGreen2 <= (signed)(31 - a_uiRadius));
assert(iDeltaGreen >= -4 && iDeltaGreen <= 3);
if (iDeltaBlue > 3)
{
if (iDeltaBlue > 7)
{
m_boolSeverelyBentColors = true;
}
iBlue1 += (iDeltaBlue - 3) / 2;
iBlue2 = iBlue1 + 3;
iDeltaBlue = 3;
}
else if (iDeltaBlue < -4)
{
if (iDeltaBlue < -8)
{
m_boolSeverelyBentColors = true;
}
iBlue1 += (iDeltaBlue + 4) / 2;
iBlue2 = iBlue1 - 4;
iDeltaBlue = -4;
}
assert(iBlue1 >= (signed)(0+a_uiRadius) && iBlue1 <= (signed)(31 - a_uiRadius));
assert(iBlue2 >= (signed)(0 + a_uiRadius) && iBlue2 <= (signed)(31 - a_uiRadius));
assert(iDeltaBlue >= -4 && iDeltaBlue <= 3);
}
m_half1.Init(iRed1, iGreen1, iBlue1, a_pauiPixelMapping1, a_uiRadius);
m_half2.Init(iRed2, iGreen2, iBlue2, a_pauiPixelMapping2, a_uiRadius);
}
// ----------------------------------------------------------------------------------------------------
//
void DifferentialTrys::Half::Init(int a_iRed, int a_iGreen, int a_iBlue,
const unsigned int *a_pauiPixelMapping, unsigned int a_uiRadius)
{
m_iRed = a_iRed;
m_iGreen = a_iGreen;
m_iBlue = a_iBlue;
m_pauiPixelMapping = a_pauiPixelMapping;
m_uiRadius = a_uiRadius;
m_uiTrys = 0;
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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 "EtcColorFloatRGBA.h"
namespace Etc
{
class DifferentialTrys
{
public:
static const unsigned int MAX_RADIUS = 2;
DifferentialTrys(ColorFloatRGBA a_frgbaColor1,
ColorFloatRGBA a_frgbaColor2,
const unsigned int *a_pauiPixelMapping1,
const unsigned int *a_pauiPixelMapping2,
unsigned int a_uiRadius,
int a_iGrayOffset1, int a_iGrayOffset2);
inline static int MoveAwayFromEdge(int a_i, int a_iDistance)
{
if (a_i < (0+ a_iDistance))
{
return (0 + a_iDistance);
}
else if (a_i > (31- a_iDistance))
{
return (31 - a_iDistance);
}
return a_i;
}
class Try
{
public :
static const unsigned int SELECTORS = 8; // per half
int m_iRed;
int m_iGreen;
int m_iBlue;
unsigned int m_uiCW;
unsigned int m_auiSelectors[SELECTORS];
float m_fError;
};
class Half
{
public:
static const unsigned int MAX_TRYS = 125;
void Init(int a_iRed, int a_iGreen, int a_iBlue,
const unsigned int *a_pauiPixelMapping,
unsigned int a_uiRadius);
// center of trys
int m_iRed;
int m_iGreen;
int m_iBlue;
const unsigned int *m_pauiPixelMapping;
unsigned int m_uiRadius;
unsigned int m_uiTrys;
Try m_atry[MAX_TRYS];
Try *m_ptryBest;
};
Half m_half1;
Half m_half2;
bool m_boolSeverelyBentColors;
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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
namespace Etc
{
enum ErrorMetric
{
RGBA,
REC709,
NUMERIC,
NORMALXYZ,
//
ERROR_METRICS,
//
BT709 = REC709
};
inline const char *ErrorMetricToString(ErrorMetric errorMetric)
{
switch (errorMetric)
{
case RGBA:
return "RGBA";
case REC709:
return "REC709";
case NUMERIC:
return "NUMERIC";
case NORMALXYZ:
return "NORMALXYZ";
case ERROR_METRICS:
default:
return "UNKNOWN";
}
}
} // namespace Etc

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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.
*/
/*
EtcIndividualTrys.cpp
Gathers the results of the various encoding trys for both halves of a 4x4 block for Individual mode
*/
#include "EtcConfig.h"
#include "EtcIndividualTrys.h"
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// construct a list of trys (encoding attempts)
//
// a_frgbaColor1 is the basecolor for the first half
// a_frgbaColor2 is the basecolor for the second half
// a_pauiPixelMapping1 is the pixel order for the first half
// a_pauiPixelMapping2 is the pixel order for the second half
// a_uiRadius is the amount to vary the base colors
//
IndividualTrys::IndividualTrys(ColorFloatRGBA a_frgbaColor1, ColorFloatRGBA a_frgbaColor2,
const unsigned int *a_pauiPixelMapping1,
const unsigned int *a_pauiPixelMapping2,
unsigned int a_uiRadius)
{
assert(a_uiRadius <= MAX_RADIUS);
ColorFloatRGBA frgbaQuantizedColor1 = a_frgbaColor1.QuantizeR4G4B4();
ColorFloatRGBA frgbaQuantizedColor2 = a_frgbaColor2.QuantizeR4G4B4();
// quantize base colors
// ensure that trys with a_uiRadius don't overflow
int iRed1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntRed(15.0f), a_uiRadius);
int iGreen1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntGreen(15.0f), a_uiRadius);
int iBlue1 = MoveAwayFromEdge(frgbaQuantizedColor1.IntBlue(15.0f), a_uiRadius);
int iRed2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntRed(15.0f), a_uiRadius);
int iGreen2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntGreen(15.0f), a_uiRadius);
int iBlue2 = MoveAwayFromEdge(frgbaQuantizedColor2.IntBlue(15.0f), a_uiRadius);
m_half1.Init(iRed1, iGreen1, iBlue1, a_pauiPixelMapping1, a_uiRadius);
m_half2.Init(iRed2, iGreen2, iBlue2, a_pauiPixelMapping2, a_uiRadius);
}
// ----------------------------------------------------------------------------------------------------
//
void IndividualTrys::Half::Init(int a_iRed, int a_iGreen, int a_iBlue,
const unsigned int *a_pauiPixelMapping, unsigned int a_uiRadius)
{
m_iRed = a_iRed;
m_iGreen = a_iGreen;
m_iBlue = a_iBlue;
m_pauiPixelMapping = a_pauiPixelMapping;
m_uiRadius = a_uiRadius;
m_uiTrys = 0;
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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 "EtcColorFloatRGBA.h"
namespace Etc
{
class IndividualTrys
{
public:
static const unsigned int MAX_RADIUS = 1;
IndividualTrys(ColorFloatRGBA a_frgbaColor1,
ColorFloatRGBA a_frgbaColor2,
const unsigned int *a_pauiPixelMapping1,
const unsigned int *a_pauiPixelMapping2,
unsigned int a_uiRadius);
inline static int MoveAwayFromEdge(int a_i, int a_iDistance)
{
if (a_i < (0+ a_iDistance))
{
return (0 + a_iDistance);
}
else if (a_i > (15- a_iDistance))
{
return (15 - a_iDistance);
}
return a_i;
}
class Try
{
public :
static const unsigned int SELECTORS = 8; // per half
int m_iRed;
int m_iGreen;
int m_iBlue;
unsigned int m_uiCW;
unsigned int m_auiSelectors[SELECTORS];
float m_fError;
};
class Half
{
public:
static const unsigned int MAX_TRYS = 27;
void Init(int a_iRed, int a_iGreen, int a_iBlue,
const unsigned int *a_pauiPixelMapping,
unsigned int a_uiRadius);
// center of trys
int m_iRed;
int m_iGreen;
int m_iBlue;
const unsigned int *m_pauiPixelMapping;
unsigned int m_uiRadius;
unsigned int m_uiTrys;
Try m_atry[MAX_TRYS];
Try *m_ptryBest;
};
Half m_half1;
Half m_half2;
};
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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.
*/
/*
EtcSortedBlockList.cpp
SortedBlockList is a list of 4x4 blocks that can be used by the "effort" system to prioritize
the encoding of the 4x4 blocks.
The sorting is done with buckets, where each bucket is an indication of how much error each 4x4 block has
*/
#include "EtcConfig.h"
#include "EtcSortedBlockList.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
// construct an empty list
//
// allocate enough memory to add all of the image's 4x4 blocks later
// allocate enough buckets to sort the blocks
//
SortedBlockList::SortedBlockList(unsigned int a_uiImageBlocks, unsigned int a_uiBuckets)
{
m_uiImageBlocks = a_uiImageBlocks;
m_iBuckets = (int)a_uiBuckets;
m_uiAddedBlocks = 0;
m_uiSortedBlocks = 0;
m_palinkPool = new Link[m_uiImageBlocks];
m_pabucket = new Bucket[m_iBuckets];
m_fMaxError = 0.0f;
InitBuckets();
}
// ----------------------------------------------------------------------------------------------------
//
SortedBlockList::~SortedBlockList(void)
{
delete[] m_palinkPool;
delete[] m_pabucket;
}
// ----------------------------------------------------------------------------------------------------
// add a 4x4 block to the list
// the 4x4 block will be sorted later
//
void SortedBlockList::AddBlock(Block4x4 *a_pblock)
{
assert(m_uiAddedBlocks < m_uiImageBlocks);
Link *plink = &m_palinkPool[m_uiAddedBlocks++];
plink->Init(a_pblock);
}
// ----------------------------------------------------------------------------------------------------
// sort all of the 4x4 blocks that have been added to the list
//
// first, determine the maximum error, then assign an error range to each bucket
// next, determine which bucket each 4x4 block belongs to based on the 4x4 block's error
// add the 4x4 block to the appropriate bucket
// lastly, walk thru the buckets and add each bucket to a sorted linked list
//
// the resultant sorting is an approximate sorting from most to least error
//
void SortedBlockList::Sort(void)
{
assert(m_uiAddedBlocks == m_uiImageBlocks);
InitBuckets();
// find max block error
m_fMaxError = -1.0f;
for (unsigned int uiLink = 0; uiLink < m_uiAddedBlocks; uiLink++)
{
Link *plinkBlock = &m_palinkPool[uiLink];
float fBlockError = plinkBlock->GetBlock()->GetError();
if (fBlockError > m_fMaxError)
{
m_fMaxError = fBlockError;
}
}
// prevent divide by zero or divide by negative
if (m_fMaxError <= 0.0f)
{
m_fMaxError = 1.0f;
}
//used for debugging
//int numDone = 0;
// put all of the blocks with unfinished encodings into the appropriate bucket
m_uiSortedBlocks = 0;
for (unsigned int uiLink = 0; uiLink < m_uiAddedBlocks; uiLink++)
{
Link *plinkBlock = &m_palinkPool[uiLink];
// if the encoding is done, don't add it to the list
if (plinkBlock->GetBlock()->GetEncoding()->IsDone())
{
//numDone++;
continue;
}
// calculate the appropriate sort bucket
float fBlockError = plinkBlock->GetBlock()->GetError();
int iBucket = (int) floorf(m_iBuckets * fBlockError / m_fMaxError);
// clamp to bucket index
iBucket = iBucket < 0 ? 0 : iBucket >= m_iBuckets ? m_iBuckets - 1 : iBucket;
// add block to bucket
{
Bucket *pbucket = &m_pabucket[iBucket];
if (pbucket->plinkLast)
{
pbucket->plinkLast->SetNext(plinkBlock);
pbucket->plinkLast = plinkBlock;
}
else
{
pbucket->plinkFirst = pbucket->plinkLast = plinkBlock;
}
plinkBlock->SetNext(nullptr);
}
m_uiSortedBlocks++;
if (0)
{
printf("%u: e=%.3f\n", uiLink, fBlockError);
Print();
printf("\n\n\n");
}
}
//printf("num blocks already done: %d\n",numDone);
//link the blocks together across buckets
m_plinkFirst = nullptr;
m_plinkLast = nullptr;
for (int iBucket = m_iBuckets - 1; iBucket >= 0; iBucket--)
{
Bucket *pbucket = &m_pabucket[iBucket];
if (pbucket->plinkFirst)
{
if (m_plinkFirst == nullptr)
{
m_plinkFirst = pbucket->plinkFirst;
}
else
{
assert(pbucket->plinkLast->GetNext() == nullptr);
m_plinkLast->SetNext(pbucket->plinkFirst);
}
m_plinkLast = pbucket->plinkLast;
}
}
}
// ----------------------------------------------------------------------------------------------------
// clear all of the buckets. normally done in preparation for a sort
//
void SortedBlockList::InitBuckets(void)
{
for (int iBucket = 0; iBucket < m_iBuckets; iBucket++)
{
Bucket *pbucket = &m_pabucket[iBucket];
pbucket->plinkFirst = 0;
pbucket->plinkLast = 0;
}
}
// ----------------------------------------------------------------------------------------------------
// print out the list of sorted 4x4 blocks
// normally used for debugging
//
void SortedBlockList::Print(void)
{
for (int iBucket = m_iBuckets-1; iBucket >= 0; iBucket--)
{
Bucket *pbucket = &m_pabucket[iBucket];
unsigned int uiBlocks = 0;
for (Link *plink = pbucket->plinkFirst; plink != nullptr; plink = plink->GetNext() )
{
uiBlocks++;
if (plink == pbucket->plinkLast)
{
break;
}
}
float fBucketError = m_fMaxError * iBucket / m_iBuckets;
float fBucketRMS = sqrtf(fBucketError / (4.0f*16.0f) );
printf("%3d: e=%.3f rms=%.6f %u\n", iBucket, fBucketError, fBucketRMS, uiBlocks);
}
}
// ----------------------------------------------------------------------------------------------------
//
} // namespace Etc

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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
namespace Etc
{
class Block4x4;
class SortedBlockList
{
public:
class Link
{
public:
inline void Init(Block4x4 *a_pblock)
{
m_pblock = a_pblock;
m_plinkNext = nullptr;
}
inline Block4x4 * GetBlock(void)
{
return m_pblock;
}
inline void SetNext(Link *a_plinkNext)
{
m_plinkNext = a_plinkNext;
}
inline Link * GetNext(void)
{
return m_plinkNext;
}
inline Link * Advance(unsigned int a_uiSteps = 1)
{
Link *plink = this;
for (unsigned int uiStep = 0; uiStep < a_uiSteps; uiStep++)
{
if (plink == nullptr)
{
break;
}
plink = plink->m_plinkNext;
}
return plink;
}
private:
Block4x4 *m_pblock;
Link *m_plinkNext;
};
SortedBlockList(unsigned int a_uiImageBlocks, unsigned int a_uiBuckets);
~SortedBlockList(void);
void AddBlock(Block4x4 *a_pblock);
void Sort(void);
inline Link * GetLinkToFirstBlock(void)
{
return m_plinkFirst;
}
inline unsigned int GetNumberOfAddedBlocks(void)
{
return m_uiAddedBlocks;
}
inline unsigned int GetNumberOfSortedBlocks(void)
{
return m_uiSortedBlocks;
}
void Print(void);
private:
void InitBuckets(void);
class Bucket
{
public:
Link *plinkFirst;
Link *plinkLast;
};
unsigned int m_uiImageBlocks;
int m_iBuckets;
unsigned int m_uiAddedBlocks;
unsigned int m_uiSortedBlocks;
Link *m_palinkPool;
Bucket *m_pabucket;
float m_fMaxError;
Link *m_plinkFirst;
Link *m_plinkLast;
};
} // namespace Etc