58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributor:
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* Jeroen Bakker
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* Monique Dewanchand
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*/
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#include "COM_AlphaOverMixedOperation.h"
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AlphaOverMixedOperation::AlphaOverMixedOperation() : MixBaseOperation()
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{
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this->m_x = 0.0f;
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}
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void AlphaOverMixedOperation::executePixel(float outputValue[4], float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[])
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{
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float inputColor1[4];
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float inputOverColor[4];
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float value[4];
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this->m_inputValueOperation->read(value, x, y, sampler, inputBuffers);
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this->m_inputColor1Operation->read(inputColor1, x, y, sampler, inputBuffers);
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this->m_inputColor2Operation->read(inputOverColor, x, y, sampler, inputBuffers);
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if (inputOverColor[3] <= 0.0f) {
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copy_v4_v4(outputValue, inputColor1);
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}
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else if (value[0] == 1.0f && inputOverColor[3] >= 1.0f) {
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copy_v4_v4(outputValue, inputOverColor);
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}
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else {
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float addfac = 1.0f - this->m_x + inputOverColor[3] * this->m_x;
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float premul = value[0] * addfac;
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float mul = 1.0f - value[0] * inputOverColor[3];
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outputValue[0] = (mul * inputColor1[0]) + premul * inputOverColor[0];
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outputValue[1] = (mul * inputColor1[1]) + premul * inputOverColor[1];
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outputValue[2] = (mul * inputColor1[2]) + premul * inputOverColor[2];
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outputValue[3] = (mul * inputColor1[3]) + value[0] * inputOverColor[3];
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}
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}
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