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