80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
/*
|
|
* 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"
|
|
|
|
extern "C" {
|
|
#include "IMB_colormanagement.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];
|
|
this->m_inputImageProgram->readSampled(inColor, x, y, sampler);
|
|
|
|
const float high = this->m_settings->t1;
|
|
const float low = this->m_settings->t2;
|
|
const float luminance = IMB_colormanagement_get_luminance(inColor);
|
|
|
|
float alpha;
|
|
|
|
/* one line thread-friend algorithm:
|
|
* output[0] = min(inputValue[3], min(1.0f, max(0.0f, ((luminance - low) / (high - low))));
|
|
*/
|
|
|
|
/* test range */
|
|
if (luminance > high) {
|
|
alpha = 1.0f;
|
|
}
|
|
else if (luminance < low) {
|
|
alpha = 0.0f;
|
|
}
|
|
else { /*blend */
|
|
alpha = (luminance - 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 */
|
|
output[0] = min_ff(alpha, inColor[3]);
|
|
}
|