Add `etcpak` library for faster ETC/ETC2/S3TC imports.

- `etc` module was renamed to `etcpak` and modified to use the new library.
- PKM importer is removed in the process, it's obsolete.
- Old library `etc2comp` is removed.
- S3TC compression no longer done via `squish` (but decompression still is).
- Slight modifications to etcpak sources for MinGW compatibility,
  to fix LLVM `-Wc++11-narrowing` errors, and to allow using vendored or
  system libpng.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>

1 files changed, 0 insertions, 685 deletions

diff --git a/thirdparty/etc2comp/EtcImage.cpp b/thirdparty/etc2comp/EtcImage.cpp
deleted file mode 100644
index 7a1058844d..0000000000
--- a/thirdparty/etc2comp/EtcImage.cpp
+++ /dev/null
@@ -1,685 +0,0 @@
-/*
- * 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.
- */
-
-/*
-EtcImage.cpp
-
-Image is an array of 4x4 blocks that represent the encoding of the source image
-
-*/
-
-#include "EtcConfig.h"
-
-#include <stdlib.h>
-
-#include "EtcImage.h"
-
-#include "Etc.h"
-#include "EtcBlock4x4.h"
-#include "EtcBlock4x4EncodingBits.h"
-#include "EtcSortedBlockList.h"
-
-#if ETC_WINDOWS
-#include <windows.h>
-#endif
-#include <ctime>
-#include <chrono>
-#include <future>
-#include <stdio.h>
-#include <string.h>
-#include <assert.h>
-
-// fix conflict with Block4x4::AlphaMix
-#ifdef OPAQUE
-#undef OPAQUE
-#endif
-#ifdef TRANSPARENT
-#undef TRANSPARENT
-#endif
-
-namespace Etc
-{
-
-	// ----------------------------------------------------------------------------------------------------
-	//
-	Image::Image(void)
-	{
-		m_encodingStatus = EncodingStatus::SUCCESS;
-		m_warningsToCapture = EncodingStatus::SUCCESS;
-		m_pafrgbaSource = nullptr;
-
-		m_pablock = nullptr;
-
-		m_encodingbitsformat = Block4x4EncodingBits::Format::UNKNOWN;
-		m_uiEncodingBitsBytes = 0;
-		m_paucEncodingBits = nullptr;
-
-		m_format = Format::UNKNOWN;
-		m_iNumOpaquePixels = 0;
-		m_iNumTranslucentPixels = 0;
-		m_iNumTransparentPixels = 0;
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// constructor using source image
-	// used to set state before Encode() is called
-	//
-	Image::Image(float *a_pafSourceRGBA, unsigned int a_uiSourceWidth,
-					unsigned int a_uiSourceHeight, 
-					ErrorMetric a_errormetric)
-	{
-		m_encodingStatus = EncodingStatus::SUCCESS;
-		m_warningsToCapture = EncodingStatus::SUCCESS;
-		m_pafrgbaSource = (ColorFloatRGBA *) a_pafSourceRGBA;
-		m_uiSourceWidth = a_uiSourceWidth;
-		m_uiSourceHeight = a_uiSourceHeight;
-
-		m_uiExtendedWidth = CalcExtendedDimension((unsigned short)m_uiSourceWidth);
-		m_uiExtendedHeight = CalcExtendedDimension((unsigned short)m_uiSourceHeight);
-
-		m_uiBlockColumns = m_uiExtendedWidth >> 2;
-		m_uiBlockRows = m_uiExtendedHeight >> 2;
-
-		m_pablock = new Block4x4[GetNumberOfBlocks()];
-		assert(m_pablock);
-
-		m_format = Format::UNKNOWN;
-
-		m_encodingbitsformat = Block4x4EncodingBits::Format::UNKNOWN;
-		m_uiEncodingBitsBytes = 0;
-		m_paucEncodingBits = nullptr;
-
-		m_errormetric = a_errormetric;
-		m_fEffort = 0.0f;
-
-		m_iEncodeTime_ms = -1;
-
-		m_iNumOpaquePixels = 0;
-		m_iNumTranslucentPixels = 0;
-		m_iNumTransparentPixels = 0;
-		m_bVerboseOutput = false;
-
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// constructor using encoding bits
-	// recreates encoding state using a previously encoded image
-	//
-	Image::Image(Format a_format,
-					unsigned int a_uiSourceWidth, unsigned int a_uiSourceHeight,
-					unsigned char *a_paucEncidingBits, unsigned int a_uiEncodingBitsBytes,
-					Image *a_pimageSource, ErrorMetric a_errormetric)
-	{
-		m_encodingStatus = EncodingStatus::SUCCESS;
-		m_pafrgbaSource = nullptr;
-		m_uiSourceWidth = a_uiSourceWidth;
-		m_uiSourceHeight = a_uiSourceHeight;
-
-		m_uiExtendedWidth = CalcExtendedDimension((unsigned short)m_uiSourceWidth);
-		m_uiExtendedHeight = CalcExtendedDimension((unsigned short)m_uiSourceHeight);
-
-		m_uiBlockColumns = m_uiExtendedWidth >> 2;
-		m_uiBlockRows = m_uiExtendedHeight >> 2;
-
-		unsigned int uiBlocks = GetNumberOfBlocks();
-
-		m_pablock = new Block4x4[uiBlocks];
-		assert(m_pablock);
-
-		m_format = a_format;
-
-		m_iNumOpaquePixels = 0;
-		m_iNumTranslucentPixels = 0;
-		m_iNumTransparentPixels = 0;
-		
-		m_encodingbitsformat = DetermineEncodingBitsFormat(m_format);
-		if (m_encodingbitsformat == Block4x4EncodingBits::Format::UNKNOWN)
-		{
-			AddToEncodingStatus(ERROR_UNKNOWN_FORMAT);
-			return;
-		}
-		m_uiEncodingBitsBytes = a_uiEncodingBitsBytes;
-		m_paucEncodingBits = a_paucEncidingBits;
-
-		m_errormetric = a_errormetric;
-		m_fEffort = 0.0f;
-		m_bVerboseOutput = false;
-		m_iEncodeTime_ms = -1;
-		
-		unsigned char *paucEncodingBits = m_paucEncodingBits;
-		unsigned int uiEncodingBitsBytesPerBlock = Block4x4EncodingBits::GetBytesPerBlock(m_encodingbitsformat);
-
-		unsigned int uiH = 0;
-		unsigned int uiV = 0;
-		for (unsigned int uiBlock = 0; uiBlock < uiBlocks; uiBlock++)
-		{
-			m_pablock[uiBlock].InitFromEtcEncodingBits(a_format, uiH, uiV, paucEncodingBits, 
-														a_pimageSource, a_errormetric);
-			paucEncodingBits += uiEncodingBitsBytesPerBlock;
-			uiH += 4;
-			if (uiH >= m_uiSourceWidth)
-			{
-				uiH = 0;
-				uiV += 4;
-			}
-		}
-
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	//
-	Image::~Image(void)
-	{
-		if (m_pablock != nullptr)
-		{
-			delete[] m_pablock;
-			m_pablock = nullptr;
-		}
-
-		/*if (m_paucEncodingBits != nullptr)
-		{
-			delete[] m_paucEncodingBits;
-			m_paucEncodingBits = nullptr;
-		}*/
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// encode an image
-	// create a set of encoding bits that conforms to a_format
-	// find best fit using a_errormetric
-	// explore a range of possible encodings based on a_fEffort (range = [0:100])
-	// speed up process using a_uiJobs as the number of process threads (a_uiJobs must not excede a_uiMaxJobs)
-	//
-	Image::EncodingStatus Image::Encode(Format a_format, ErrorMetric a_errormetric, float a_fEffort, unsigned int a_uiJobs, unsigned int a_uiMaxJobs)
-	{
-
-		auto start = std::chrono::steady_clock::now();
-		
-		m_encodingStatus = EncodingStatus::SUCCESS;
-
-		m_format = a_format;
-		m_errormetric = a_errormetric;
-		m_fEffort = a_fEffort;
-
-		if (m_errormetric < 0 || m_errormetric > ERROR_METRICS)
-		{
-			AddToEncodingStatus(ERROR_UNKNOWN_ERROR_METRIC);
-			return m_encodingStatus;
-		}
-
-		if (m_fEffort < ETCCOMP_MIN_EFFORT_LEVEL)
-		{
-			AddToEncodingStatus(WARNING_EFFORT_OUT_OF_RANGE);
-			m_fEffort = ETCCOMP_MIN_EFFORT_LEVEL;
-		}
-		else if (m_fEffort > ETCCOMP_MAX_EFFORT_LEVEL)
-		{
-			AddToEncodingStatus(WARNING_EFFORT_OUT_OF_RANGE);
-			m_fEffort = ETCCOMP_MAX_EFFORT_LEVEL;
-		}
-		if (a_uiJobs < 1)
-		{
-			a_uiJobs = 1;
-			AddToEncodingStatus(WARNING_JOBS_OUT_OF_RANGE);
-		}
-		else if (a_uiJobs > a_uiMaxJobs)
-		{
-			a_uiJobs = a_uiMaxJobs;
-			AddToEncodingStatus(WARNING_JOBS_OUT_OF_RANGE);
-		}
-
-		m_encodingbitsformat = DetermineEncodingBitsFormat(m_format);
-
-		if (m_encodingbitsformat == Block4x4EncodingBits::Format::UNKNOWN)
-		{
-			AddToEncodingStatus(ERROR_UNKNOWN_FORMAT);
-			return m_encodingStatus;
-		}
-
-		assert(m_paucEncodingBits == nullptr);
-		m_uiEncodingBitsBytes = GetNumberOfBlocks() * Block4x4EncodingBits::GetBytesPerBlock(m_encodingbitsformat);
-		m_paucEncodingBits = new unsigned char[m_uiEncodingBitsBytes];
-
-		InitBlocksAndBlockSorter();
-
-
-		std::future<void> *handle = new std::future<void>[a_uiMaxJobs];
-
-		unsigned int uiNumThreadsNeeded = 0;
-		unsigned int uiUnfinishedBlocks = GetNumberOfBlocks();
-
-		uiNumThreadsNeeded = (uiUnfinishedBlocks < a_uiJobs) ? uiUnfinishedBlocks : a_uiJobs;
-			
-		for (int i = 0; i < (int)uiNumThreadsNeeded - 1; i++)
-		{
-			handle[i] = async(std::launch::async, &Image::RunFirstPass, this, i, uiNumThreadsNeeded);
-		}
-
-		RunFirstPass(uiNumThreadsNeeded - 1, uiNumThreadsNeeded);
-
-		for (int i = 0; i < (int)uiNumThreadsNeeded - 1; i++)
-		{
-			handle[i].get();
-		}
-
-		// perform effort-based encoding
-		if (m_fEffort > ETCCOMP_MIN_EFFORT_LEVEL)
-		{
-			unsigned int uiFinishedBlocks = 0;
-			unsigned int uiTotalEffortBlocks = static_cast<unsigned int>(roundf(0.01f * m_fEffort  * GetNumberOfBlocks()));
-
-			if (m_bVerboseOutput)
-			{
-				printf("effortblocks = %d\n", uiTotalEffortBlocks);
-			}
-			unsigned int uiPass = 0;
-			while (1)
-			{
-				if (m_bVerboseOutput)
-				{
-					uiPass++;
-					printf("pass %u\n", uiPass);
-				}
-				m_psortedblocklist->Sort();
-				uiUnfinishedBlocks = m_psortedblocklist->GetNumberOfSortedBlocks();
-				uiFinishedBlocks = GetNumberOfBlocks() - uiUnfinishedBlocks;
-				if (m_bVerboseOutput)
-				{
-					printf("    %u unfinished blocks\n", uiUnfinishedBlocks);
-					// m_psortedblocklist->Print();
-				}
-
-				
-
-				//stop enocding when we did enough to satify the effort percentage
-				if (uiFinishedBlocks >= uiTotalEffortBlocks)
-				{
-					if (m_bVerboseOutput)
-					{
-						printf("Finished %d Blocks out of %d\n", uiFinishedBlocks, uiTotalEffortBlocks);
-					}
-					break;
-				}
-
-				unsigned int uiIteratedBlocks = 0;
-				unsigned int blocksToIterateThisPass = (uiTotalEffortBlocks - uiFinishedBlocks);
-				uiNumThreadsNeeded = (uiUnfinishedBlocks < a_uiJobs) ? uiUnfinishedBlocks : a_uiJobs;
-
-				if (uiNumThreadsNeeded <= 1)
-				{
-					//since we already how many blocks each thread will process
-					//cap the thread limit to do the proper amount of work, and not more
-					uiIteratedBlocks = IterateThroughWorstBlocks(blocksToIterateThisPass, 0, 1);
-				}
-				else
-				{
-					//we have a lot of work to do, so lets multi thread it
-					std::future<unsigned int> *handleToBlockEncoders = new std::future<unsigned int>[uiNumThreadsNeeded-1];
-
-					for (int i = 0; i < (int)uiNumThreadsNeeded - 1; i++)
-					{
-						handleToBlockEncoders[i] = async(std::launch::async, &Image::IterateThroughWorstBlocks, this, blocksToIterateThisPass, i, uiNumThreadsNeeded);
-					}
-					uiIteratedBlocks = IterateThroughWorstBlocks(blocksToIterateThisPass, uiNumThreadsNeeded - 1, uiNumThreadsNeeded);
-
-					for (int i = 0; i < (int)uiNumThreadsNeeded - 1; i++)
-					{
-						uiIteratedBlocks += handleToBlockEncoders[i].get();
-					}
-
-					delete[] handleToBlockEncoders;
-				}
-
-				if (m_bVerboseOutput)
-				{
-					printf("    %u iterated blocks\n", uiIteratedBlocks);
-				}
-			}
-		}
-
-		// generate Etc2-compatible bit-format 4x4 blocks
-		for (int i = 0; i < (int)a_uiJobs - 1; i++)
-		{
-			handle[i] = async(std::launch::async, &Image::SetEncodingBits, this, i, a_uiJobs);
-		}
-		SetEncodingBits(a_uiJobs - 1, a_uiJobs);
-
-		for (int i = 0; i < (int)a_uiJobs - 1; i++)
-		{
-			handle[i].get();
-		}
-
-		auto end = std::chrono::steady_clock::now();
-		std::chrono::milliseconds elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
-		m_iEncodeTime_ms = (int)elapsed.count();
-
-		delete[] handle;
-		delete m_psortedblocklist;
-		return m_encodingStatus;
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// iterate the encoding thru the blocks with the worst error
-	// stop when a_uiMaxBlocks blocks have been iterated
-	// split the blocks between the process threads using a_uiMultithreadingOffset and a_uiMultithreadingStride
-	//
-	unsigned int Image::IterateThroughWorstBlocks(unsigned int a_uiMaxBlocks, 
-													unsigned int a_uiMultithreadingOffset, 
-													unsigned int a_uiMultithreadingStride)
-	{
-		assert(a_uiMultithreadingStride > 0);
-		unsigned int uiIteratedBlocks = a_uiMultithreadingOffset;
-
-		SortedBlockList::Link *plink = m_psortedblocklist->GetLinkToFirstBlock();
-		for (plink = plink->Advance(a_uiMultithreadingOffset);
-				plink != nullptr;
-				plink = plink->Advance(a_uiMultithreadingStride) )
-		{
-			if (uiIteratedBlocks >= a_uiMaxBlocks)
-			{
-				break;
-			}
-
-			plink->GetBlock()->PerformEncodingIteration(m_fEffort);
-
-			uiIteratedBlocks += a_uiMultithreadingStride;	
-		}
-
-		return uiIteratedBlocks;
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// determine which warnings to check for during Encode() based on encoding format
-	//
-	void Image::FindEncodingWarningTypesForCurFormat()
-	{
-		TrackEncodingWarning(WARNING_ALL_TRANSPARENT_PIXELS);
-		TrackEncodingWarning(WARNING_SOME_RGBA_NOT_0_TO_1);
-		switch (m_format)
-		{
-		case Image::Format::ETC1:
-		case Image::Format::RGB8:
-		case Image::Format::SRGB8:
-			TrackEncodingWarning(WARNING_SOME_NON_OPAQUE_PIXELS);
-			TrackEncodingWarning(WARNING_SOME_TRANSLUCENT_PIXELS);
-			break;
-
-		case Image::Format::RGB8A1:
-		case Image::Format::SRGB8A1:
-			TrackEncodingWarning(WARNING_SOME_TRANSLUCENT_PIXELS);
-			TrackEncodingWarning(WARNING_ALL_OPAQUE_PIXELS);
-			break;
-		case Image::Format::RGBA8:
-		case Image::Format::SRGBA8:
-			TrackEncodingWarning(WARNING_ALL_OPAQUE_PIXELS);
-			break;
-
-		case Image::Format::R11:
-		case Image::Format::SIGNED_R11:
-			TrackEncodingWarning(WARNING_SOME_NON_OPAQUE_PIXELS);
-			TrackEncodingWarning(WARNING_SOME_TRANSLUCENT_PIXELS);
-			TrackEncodingWarning(WARNING_SOME_GREEN_VALUES_ARE_NOT_ZERO);
-			TrackEncodingWarning(WARNING_SOME_BLUE_VALUES_ARE_NOT_ZERO);
-			break;
-
-		case Image::Format::RG11:
-		case Image::Format::SIGNED_RG11:
-			TrackEncodingWarning(WARNING_SOME_NON_OPAQUE_PIXELS);
-			TrackEncodingWarning(WARNING_SOME_TRANSLUCENT_PIXELS);
-			TrackEncodingWarning(WARNING_SOME_BLUE_VALUES_ARE_NOT_ZERO);
-			break;
-		case Image::Format::FORMATS:
-		case Image::Format::UNKNOWN:
-		default:
-			assert(0);
-			break;
-		}
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// examine source pixels to check for warnings
-	//
-	void Image::FindAndSetEncodingWarnings()
-	{
-		int numPixels = (m_uiBlockRows * 4) * (m_uiBlockColumns * 4);
-		if (m_iNumOpaquePixels == numPixels)
-		{
-			AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_ALL_OPAQUE_PIXELS);
-		}
-		if (m_iNumOpaquePixels < numPixels)
-		{
-			AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_NON_OPAQUE_PIXELS);
-		}
-		if (m_iNumTranslucentPixels > 0)
-		{
-			AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_TRANSLUCENT_PIXELS);
-		}
-		if (m_iNumTransparentPixels == numPixels)
-		{
-			AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_ALL_TRANSPARENT_PIXELS);
-		}
-		if (m_numColorValues.fB > 0.0f)
-		{
-			AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_BLUE_VALUES_ARE_NOT_ZERO);
-		}
-		if (m_numColorValues.fG > 0.0f) 
-		{
-			AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_GREEN_VALUES_ARE_NOT_ZERO);
-		}
-
-		if (m_numOutOfRangeValues.fR > 0.0f || m_numOutOfRangeValues.fG > 0.0f)
-		{
-			AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_RGBA_NOT_0_TO_1);
-		}
-		if (m_numOutOfRangeValues.fB > 0.0f || m_numOutOfRangeValues.fA > 0.0f)
-		{
-			AddToEncodingStatusIfSignfigant(Image::EncodingStatus::WARNING_SOME_RGBA_NOT_0_TO_1);
-		}
-	}
-	
-	// ----------------------------------------------------------------------------------------------------
-	// return a string name for a given image format
-	//
-	const char * Image::EncodingFormatToString(Image::Format a_format)
-	{
-		switch (a_format)
-		{
-		case Image::Format::ETC1:
-			return "ETC1";
-		case Image::Format::RGB8:
-			return "RGB8";
-		case Image::Format::SRGB8:
-			return "SRGB8";
-
-		case Image::Format::RGB8A1:
-			return "RGB8A1";
-		case Image::Format::SRGB8A1:
-			return "SRGB8A1";
-		case Image::Format::RGBA8:
-			return "RGBA8";
-		case Image::Format::SRGBA8:
-			return "SRGBA8";
-
-		case Image::Format::R11:
-			return "R11";
-		case Image::Format::SIGNED_R11:
-			return "SIGNED_R11";
-
-		case Image::Format::RG11:
-			return "RG11";
-		case Image::Format::SIGNED_RG11:
-			return "SIGNED_RG11";
-		case Image::Format::FORMATS:
-		case Image::Format::UNKNOWN:
-		default:
-			return "UNKNOWN";
-		}
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// return a string name for the image's format
-	//
-	const char * Image::EncodingFormatToString(void)
-	{
-		return EncodingFormatToString(m_format);
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// init image blocks prior to encoding
-	// init block sorter for subsequent sortings
-	// check for encoding warnings
-	//
-	void Image::InitBlocksAndBlockSorter(void)
-	{
-		
-		FindEncodingWarningTypesForCurFormat();
-
-		// init each block
-		Block4x4 *pblock = m_pablock;
-		unsigned char *paucEncodingBits = m_paucEncodingBits;
-		for (unsigned int uiBlockRow = 0; uiBlockRow < m_uiBlockRows; uiBlockRow++)
-		{
-			unsigned int uiBlockV = uiBlockRow * 4;
-
-			for (unsigned int uiBlockColumn = 0; uiBlockColumn < m_uiBlockColumns; uiBlockColumn++)
-			{
-				unsigned int uiBlockH = uiBlockColumn * 4;
-
-				pblock->InitFromSource(this, uiBlockH, uiBlockV, paucEncodingBits, m_errormetric);
-
-				paucEncodingBits += Block4x4EncodingBits::GetBytesPerBlock(m_encodingbitsformat);
-
-				pblock++;
-			}
-		}
-
-		FindAndSetEncodingWarnings();
-
-		// init block sorter
-		{
-			m_psortedblocklist = new SortedBlockList(GetNumberOfBlocks(), 100);
-
-			for (unsigned int uiBlock = 0; uiBlock < GetNumberOfBlocks(); uiBlock++)
-			{
-				pblock = &m_pablock[uiBlock];
-				m_psortedblocklist->AddBlock(pblock);
-			}
-		}
-
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// run the first pass of the encoder
-	// the encoder generally finds a reasonable, fast encoding
-	// this is run on all blocks regardless of effort to ensure that all blocks have a valid encoding
-	//
-	void Image::RunFirstPass(unsigned int a_uiMultithreadingOffset, unsigned int a_uiMultithreadingStride)
-	{
-		assert(a_uiMultithreadingStride > 0);
-
-		for (unsigned int uiBlock = a_uiMultithreadingOffset;
-				uiBlock < GetNumberOfBlocks(); 
-				uiBlock += a_uiMultithreadingStride)
-		{
-			Block4x4 *pblock = &m_pablock[uiBlock];
-			pblock->PerformEncodingIteration(m_fEffort);
-		}
-	}
-
-    // ----------------------------------------------------------------------------------------------------
-	// set the encoding bits (for the output file) based on the best encoding for each block
-	//
-	void Image::SetEncodingBits(unsigned int a_uiMultithreadingOffset,
-								unsigned int a_uiMultithreadingStride)
-	{
-		assert(a_uiMultithreadingStride > 0);
-
-		for (unsigned int uiBlock = a_uiMultithreadingOffset; 
-				uiBlock < GetNumberOfBlocks(); 
-				uiBlock += a_uiMultithreadingStride)
-		{
-			Block4x4 *pblock = &m_pablock[uiBlock];
-			pblock->SetEncodingBitsFromEncoding();
-		}
-
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// return the image error
-	// image error is the sum of all block errors
-	//
-	float Image::GetError(void)
-	{
-		float fError = 0.0f;
-
-		for (unsigned int uiBlock = 0; uiBlock < GetNumberOfBlocks(); uiBlock++)
-		{
-			Block4x4 *pblock = &m_pablock[uiBlock];
-			fError += pblock->GetError();
-		}
-
-		return fError;
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	// determine the encoding bits format based on the encoding format
-	// the encoding bits format is a family of bit encodings that are shared across various encoding formats
-	//
-	Block4x4EncodingBits::Format Image::DetermineEncodingBitsFormat(Format a_format)
-	{
-		Block4x4EncodingBits::Format encodingbitsformat;
-
-		// determine encoding bits format from image format
-		switch (a_format)
-		{
-		case Format::ETC1:
-		case Format::RGB8:
-		case Format::SRGB8:
-			encodingbitsformat = Block4x4EncodingBits::Format::RGB8;
-			break;
-
-		case Format::RGBA8:
-		case Format::SRGBA8:
-			encodingbitsformat = Block4x4EncodingBits::Format::RGBA8;
-			break;
-
-		case Format::R11:
-		case Format::SIGNED_R11:
-			encodingbitsformat = Block4x4EncodingBits::Format::R11;
-			break;
-
-		case Format::RG11:
-		case Format::SIGNED_RG11:
-			encodingbitsformat = Block4x4EncodingBits::Format::RG11;
-			break;
-
-		case Format::RGB8A1:
-		case Format::SRGB8A1:
-			encodingbitsformat = Block4x4EncodingBits::Format::RGB8A1;
-			break;
-
-		default:
-			encodingbitsformat = Block4x4EncodingBits::Format::UNKNOWN;
-			break;
-		}
-
-		return encodingbitsformat;
-	}
-
-	// ----------------------------------------------------------------------------------------------------
-	//
-
-}	// namespace Etc