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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_MixOverlayOperation.h"
MixOverlayOperation::MixOverlayOperation() : MixBaseOperation()
{
/* pass */
}
void MixOverlayOperation::executePixel(float output[4], float x, float y, PixelSampler sampler)
{
float inputColor1[4];
float inputColor2[4];
float value;
this->m_inputValueOperation->read(&value, x, y, sampler);
this->m_inputColor1Operation->read(&inputColor1[0], x, y, sampler);
this->m_inputColor2Operation->read(&inputColor2[0], x, y, sampler);
if (this->useValueAlphaMultiply()) {
value *= inputColor2[3];
}
float valuem = 1.0f - value;
if (inputColor1[0] < 0.5f) {
output[0] = inputColor1[0] * (valuem + 2.0f * value * inputColor2[0]);
}
else {
output[0] = 1.0f - (valuem + 2.0f * value * (1.0f - inputColor2[0])) * (1.0f - inputColor1[0]);
}
if (inputColor1[1] < 0.5f) {
output[1] = inputColor1[1] * (valuem + 2.0f * value * inputColor2[1]);
}
else {
output[1] = 1.0f - (valuem + 2.0f * value * (1.0f - inputColor2[1])) * (1.0f - inputColor1[1]);
}
if (inputColor1[2] < 0.5f) {
output[2] = inputColor1[2] * (valuem + 2.0f * value * inputColor2[2]);
}
else {
output[2] = 1.0f - (valuem + 2.0f * value * (1.0f - inputColor2[2])) * (1.0f - inputColor1[2]);
}
output[3] = inputColor1[3];
clampIfNeeded(output);
}
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