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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:
* Dalai Felinto
*/
#include "COM_LuminanceMatteOperation.h"
#include "BLI_math.h"
LuminanceMatteOperation::LuminanceMatteOperation() : NodeOperation()
{
addInputSocket(COM_DT_COLOR);
addOutputSocket(COM_DT_VALUE);
this->m_inputImageProgram = NULL;
}
void LuminanceMatteOperation::initExecution()
{
this->m_inputImageProgram = this->getInputSocketReader(0);
}
void LuminanceMatteOperation::deinitExecution()
{
this->m_inputImageProgram = NULL;
}
void LuminanceMatteOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler)
{
float inColor[4];
const float high = this->m_settings->t1;
const float low = this->m_settings->t2;
float alpha;
this->m_inputImageProgram->readSampled(inColor, x, y, sampler);
/* one line thread-friend algorithm:
* output[0] = max(inputValue[3], min(high, max(low, ((inColor[0]-low)/(high-low))))
*/
/* test range */
if (inColor[0] > high) {
alpha = 1.f;
}
else if (inColor[0] < low) {
alpha = 0.f;
}
else { /*blend */
alpha = (inColor[0] - low) / (high - low);
}
/* store matte(alpha) value in [0] to go with
* COM_SetAlphaOperation and the Value output
*/
/* don't make something that was more transparent less transparent */
if (alpha < inColor[3]) {
output[0] = alpha;
}
else {
/* leave now it was before */
output[0] = inColor[3];
}
}
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