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448 lines
15 KiB
C++
448 lines
15 KiB
C++
/*
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* Copyright 2015 The Etc2Comp Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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EtcBlock4x4Encoding_RG11.cpp
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Block4x4Encoding_RG11 is the encoder to use when targetting file format RG11 and SRG11 (signed RG11).
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*/
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#include "EtcConfig.h"
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#include "EtcBlock4x4Encoding_RG11.h"
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#include "EtcBlock4x4EncodingBits.h"
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#include "EtcBlock4x4.h"
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <float.h>
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#include <limits>
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namespace Etc
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{
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// ----------------------------------------------------------------------------------------------------
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//
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Block4x4Encoding_RG11::Block4x4Encoding_RG11(void)
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{
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m_pencodingbitsRG11 = nullptr;
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}
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Block4x4Encoding_RG11::~Block4x4Encoding_RG11(void) {}
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// ----------------------------------------------------------------------------------------------------
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// initialization prior to encoding
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// a_pblockParent points to the block associated with this encoding
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// a_errormetric is used to choose the best encoding
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// a_pafrgbaSource points to a 4x4 block subset of the source image
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// a_paucEncodingBits points to the final encoding bits
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//
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void Block4x4Encoding_RG11::InitFromSource(Block4x4 *a_pblockParent,
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ColorFloatRGBA *a_pafrgbaSource,
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unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
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{
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Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
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m_pencodingbitsRG11 = (Block4x4EncodingBits_RG11 *)a_paucEncodingBits;
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}
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// ----------------------------------------------------------------------------------------------------
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// initialization from the encoding bits of a previous encoding
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// a_pblockParent points to the block associated with this encoding
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// a_errormetric is used to choose the best encoding
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// a_pafrgbaSource points to a 4x4 block subset of the source image
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// a_paucEncodingBits points to the final encoding bits of a previous encoding
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//
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void Block4x4Encoding_RG11::InitFromEncodingBits(Block4x4 *a_pblockParent,
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unsigned char *a_paucEncodingBits,
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ColorFloatRGBA *a_pafrgbaSource,
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ErrorMetric a_errormetric)
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{
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m_pencodingbitsRG11 = (Block4x4EncodingBits_RG11 *)a_paucEncodingBits;
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// init RGB portion
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Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
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(unsigned char *)m_pencodingbitsRG11,
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a_pafrgbaSource,
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a_errormetric);
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m_fError = 0.0f;
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{
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m_mode = MODE_RG11;
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if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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m_fRedBase = (float)(signed char)m_pencodingbitsRG11->data.baseR;
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m_fGrnBase = (float)(signed char)m_pencodingbitsRG11->data.baseG;
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}
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else
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{
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m_fRedBase = (float)(unsigned char)m_pencodingbitsRG11->data.baseR;
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m_fGrnBase = (float)(unsigned char)m_pencodingbitsRG11->data.baseG;
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}
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m_fRedMultiplier = (float)m_pencodingbitsRG11->data.multiplierR;
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m_fGrnMultiplier = (float)m_pencodingbitsRG11->data.multiplierG;
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m_uiRedModifierTableIndex = m_pencodingbitsRG11->data.tableIndexR;
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m_uiGrnModifierTableIndex = m_pencodingbitsRG11->data.tableIndexG;
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unsigned long long int ulliSelectorBitsR = 0;
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ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR0 << 40;
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ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR1 << 32;
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ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR2 << 24;
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ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR3 << 16;
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ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR4 << 8;
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ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR5;
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unsigned long long int ulliSelectorBitsG = 0;
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ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG0 << 40;
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ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG1 << 32;
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ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG2 << 24;
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ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG3 << 16;
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ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG4 << 8;
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ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG5;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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unsigned int uiShift = 45 - (3 * uiPixel);
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m_auiRedSelectors[uiPixel] = (ulliSelectorBitsR >> uiShift) & (SELECTORS - 1);
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m_auiGrnSelectors[uiPixel] = (ulliSelectorBitsG >> uiShift) & (SELECTORS - 1);
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}
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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float fRedDecodedData = 0.0f;
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float fGrnDecodedData = 0.0f;
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if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
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{
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fRedDecodedData = DecodePixelRed(m_fRedBase, m_fRedMultiplier, m_uiRedModifierTableIndex, m_auiRedSelectors[uiPixel]);
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fGrnDecodedData = DecodePixelRed(m_fGrnBase, m_fGrnMultiplier, m_uiGrnModifierTableIndex, m_auiGrnSelectors[uiPixel]);
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}
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else if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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fRedDecodedData = DecodePixelRed(m_fRedBase + 128, m_fRedMultiplier, m_uiRedModifierTableIndex, m_auiRedSelectors[uiPixel]);
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fGrnDecodedData = DecodePixelRed(m_fGrnBase + 128, m_fGrnMultiplier, m_uiGrnModifierTableIndex, m_auiGrnSelectors[uiPixel]);
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}
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else
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{
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assert(0);
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}
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m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fRedDecodedData, fGrnDecodedData, 0.0f, 1.0f);
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}
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}
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CalcBlockError();
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}
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// ----------------------------------------------------------------------------------------------------
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// perform a single encoding iteration
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// replace the encoding if a better encoding was found
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// subsequent iterations generally take longer for each iteration
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// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
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//
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void Block4x4Encoding_RG11::PerformIteration(float a_fEffort)
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{
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assert(!m_boolDone);
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switch (m_uiEncodingIterations)
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{
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case 0:
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m_fError = FLT_MAX;
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m_fGrnBlockError = FLT_MAX; // artificially high value
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m_fRedBlockError = FLT_MAX;
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CalculateR11(8, 0.0f, 0.0f);
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CalculateG11(8, 0.0f, 0.0f);
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m_fError = (m_fGrnBlockError + m_fRedBlockError);
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break;
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case 1:
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CalculateR11(8, 2.0f, 1.0f);
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CalculateG11(8, 2.0f, 1.0f);
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m_fError = (m_fGrnBlockError + m_fRedBlockError);
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if (a_fEffort <= 24.5f)
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{
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m_boolDone = true;
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}
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break;
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case 2:
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CalculateR11(8, 12.0f, 1.0f);
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CalculateG11(8, 12.0f, 1.0f);
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m_fError = (m_fGrnBlockError + m_fRedBlockError);
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if (a_fEffort <= 49.5f)
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{
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m_boolDone = true;
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}
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break;
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case 3:
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CalculateR11(7, 6.0f, 1.0f);
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CalculateG11(7, 6.0f, 1.0f);
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m_fError = (m_fGrnBlockError + m_fRedBlockError);
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break;
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case 4:
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CalculateR11(6, 3.0f, 1.0f);
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CalculateG11(6, 3.0f, 1.0f);
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m_fError = (m_fGrnBlockError + m_fRedBlockError);
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break;
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case 5:
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CalculateR11(5, 1.0f, 0.0f);
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CalculateG11(5, 1.0f, 0.0f);
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m_fError = (m_fGrnBlockError + m_fRedBlockError);
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m_boolDone = true;
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break;
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default:
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assert(0);
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break;
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}
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m_uiEncodingIterations++;
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SetDoneIfPerfect();
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}
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// ----------------------------------------------------------------------------------------------------
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// find the best combination of base color, multiplier and selectors
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//
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// a_uiSelectorsUsed limits the number of selector combinations to try
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// a_fBaseRadius limits the range of base colors to try
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// a_fMultiplierRadius limits the range of multipliers to try
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//
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void Block4x4Encoding_RG11::CalculateG11(unsigned int a_uiSelectorsUsed,
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float a_fBaseRadius, float a_fMultiplierRadius)
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{
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// maps from virtual (monotonic) selector to etc selector
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static const unsigned int auiVirtualSelectorMap[8] = { 3, 2, 1, 0, 4, 5, 6, 7 };
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// find min/max Grn
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float fMinGrn = 1.0f;
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float fMaxGrn = 0.0f;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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// ignore border pixels
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float fAlpha = m_pafrgbaSource[uiPixel].fA;
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if (isnan(fAlpha))
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{
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continue;
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}
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float fGrn = m_pafrgbaSource[uiPixel].fG;
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if (fGrn < fMinGrn)
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{
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fMinGrn = fGrn;
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}
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if (fGrn > fMaxGrn)
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{
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fMaxGrn = fGrn;
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}
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}
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assert(fMinGrn <= fMaxGrn);
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float fGrnRange = (fMaxGrn - fMinGrn);
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// try each modifier table entry
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for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
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{
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for (unsigned int uiMinVirtualSelector = 0;
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uiMinVirtualSelector <= (8 - a_uiSelectorsUsed);
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uiMinVirtualSelector++)
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{
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unsigned int uiMaxVirtualSelector = uiMinVirtualSelector + a_uiSelectorsUsed - 1;
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unsigned int uiMinSelector = auiVirtualSelectorMap[uiMinVirtualSelector];
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unsigned int uiMaxSelector = auiVirtualSelectorMap[uiMaxVirtualSelector];
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float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][uiMinSelector];
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float fTableEntryRange = s_aafModifierTable[uiTableEntry][uiMaxSelector] -
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s_aafModifierTable[uiTableEntry][uiMinSelector];
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float fCenterRatio = fTableEntryCenter / fTableEntryRange;
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float fCenter = fMinGrn + fCenterRatio*fGrnRange;
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fCenter = roundf(255.0f * fCenter) / 255.0f;
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float fMinBase = fCenter - (a_fBaseRadius / 255.0f);
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if (fMinBase < 0.0f)
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{
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fMinBase = 0.0f;
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}
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float fMaxBase = fCenter + (a_fBaseRadius / 255.0f);
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if (fMaxBase > 1.0f)
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{
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fMaxBase = 1.0f;
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}
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for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
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{
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float fRangeMultiplier = roundf(fGrnRange / fTableEntryRange);
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float fMinMultiplier = fRangeMultiplier - a_fMultiplierRadius;
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if (fMinMultiplier < 1.0f)
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{
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fMinMultiplier = 0.0f;
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}
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else if (fMinMultiplier > 15.0f)
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{
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fMinMultiplier = 15.0f;
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}
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float fMaxMultiplier = fRangeMultiplier + a_fMultiplierRadius;
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if (fMaxMultiplier < 1.0f)
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{
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fMaxMultiplier = 1.0f;
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}
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else if (fMaxMultiplier > 15.0f)
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{
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fMaxMultiplier = 15.0f;
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}
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for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
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{
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// find best selector for each pixel
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unsigned int auiBestSelectors[PIXELS];
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float afBestGrnError[PIXELS];
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float afBestPixelGrn[PIXELS];
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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float fBestPixelGrnError = FLT_MAX;
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for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
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{
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//DecodePixelRed is not red channel specific
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float fPixelGrn = DecodePixelRed(fBase * 255.0f, fMultiplier, uiTableEntry, uiSelector);
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ColorFloatRGBA frgba(m_pafrgbaSource[uiPixel].fR, fPixelGrn, 0.0f, 1.0f);
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float fPixelGrnError = CalcPixelError(frgba, 1.0f, m_pafrgbaSource[uiPixel]);
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if (fPixelGrnError < fBestPixelGrnError)
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{
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fBestPixelGrnError = fPixelGrnError;
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auiBestSelectors[uiPixel] = uiSelector;
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afBestGrnError[uiPixel] = fBestPixelGrnError;
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afBestPixelGrn[uiPixel] = fPixelGrn;
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}
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}
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}
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float fBlockError = 0.0f;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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fBlockError += afBestGrnError[uiPixel];
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}
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if (fBlockError < m_fGrnBlockError)
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{
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m_fGrnBlockError = fBlockError;
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if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
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{
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m_fGrnBase = 255.0f * fBase;
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}
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else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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m_fGrnBase = (fBase * 255) - 128;
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}
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else
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{
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assert(0);
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}
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m_fGrnMultiplier = fMultiplier;
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m_uiGrnModifierTableIndex = uiTableEntry;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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m_auiGrnSelectors[uiPixel] = auiBestSelectors[uiPixel];
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m_afrgbaDecodedColors[uiPixel].fG = afBestPixelGrn[uiPixel];
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m_afDecodedAlphas[uiPixel] = 1.0f;
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}
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}
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}
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}
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}
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}
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}
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// ----------------------------------------------------------------------------------------------------
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// set the encoding bits based on encoding state
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//
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void Block4x4Encoding_RG11::SetEncodingBits(void)
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{
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unsigned long long int ulliSelectorBitsR = 0;
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unsigned long long int ulliSelectorBitsG = 0;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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unsigned int uiShift = 45 - (3 * uiPixel);
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ulliSelectorBitsR |= ((unsigned long long int)m_auiRedSelectors[uiPixel]) << uiShift;
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ulliSelectorBitsG |= ((unsigned long long int)m_auiGrnSelectors[uiPixel]) << uiShift;
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}
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if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
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{
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m_pencodingbitsRG11->data.baseR = (unsigned char)roundf(m_fRedBase);
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}
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else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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m_pencodingbitsRG11->data.baseR = (signed char)roundf(m_fRedBase);
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}
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else
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{
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assert(0);
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}
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m_pencodingbitsRG11->data.tableIndexR = m_uiRedModifierTableIndex;
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m_pencodingbitsRG11->data.multiplierR = (unsigned char)roundf(m_fRedMultiplier);
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m_pencodingbitsRG11->data.selectorsR0 = ulliSelectorBitsR >> 40;
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m_pencodingbitsRG11->data.selectorsR1 = ulliSelectorBitsR >> 32;
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m_pencodingbitsRG11->data.selectorsR2 = ulliSelectorBitsR >> 24;
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m_pencodingbitsRG11->data.selectorsR3 = ulliSelectorBitsR >> 16;
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m_pencodingbitsRG11->data.selectorsR4 = ulliSelectorBitsR >> 8;
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m_pencodingbitsRG11->data.selectorsR5 = ulliSelectorBitsR;
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if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
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{
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m_pencodingbitsRG11->data.baseG = (unsigned char)roundf(m_fGrnBase);
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}
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else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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m_pencodingbitsRG11->data.baseG = (signed char)roundf(m_fGrnBase);
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}
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else
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{
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assert(0);
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}
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m_pencodingbitsRG11->data.tableIndexG = m_uiGrnModifierTableIndex;
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m_pencodingbitsRG11->data.multiplierG = (unsigned char)roundf(m_fGrnMultiplier);
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m_pencodingbitsRG11->data.selectorsG0 = ulliSelectorBitsG >> 40;
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m_pencodingbitsRG11->data.selectorsG1 = ulliSelectorBitsG >> 32;
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m_pencodingbitsRG11->data.selectorsG2 = ulliSelectorBitsG >> 24;
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m_pencodingbitsRG11->data.selectorsG3 = ulliSelectorBitsG >> 16;
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m_pencodingbitsRG11->data.selectorsG4 = ulliSelectorBitsG >> 8;
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m_pencodingbitsRG11->data.selectorsG5 = ulliSelectorBitsG;
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}
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// ----------------------------------------------------------------------------------------------------
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//
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}
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