/* * 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; } // ---------------------------------------------------------------------------------------------------- // }