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