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/*
* Copyright 2012, 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
* Sergey Sharybin
*/
#include "COM_KeyingDespillOperation.h"
#include "MEM_guardedalloc.h"
#include "BLI_listbase.h"
#include "BLI_math.h"
static int get_pixel_primary_channel(float *pixel)
{
float max_value = MAX3(pixel[0], pixel[1], pixel[2]);
if (max_value == pixel[0])
return 0;
else if (max_value == pixel[1])
return 1;
return 2;
}
KeyingDespillOperation::KeyingDespillOperation(): NodeOperation()
{
this->addInputSocket(COM_DT_COLOR);
this->addInputSocket(COM_DT_COLOR);
this->addOutputSocket(COM_DT_COLOR);
this->despillFactor = 0.5f;
this->pixelReader = NULL;
this->screenReader = NULL;
}
void KeyingDespillOperation::initExecution()
{
this->pixelReader = this->getInputSocketReader(0);
this->screenReader = this->getInputSocketReader(1);
}
void KeyingDespillOperation::deinitExecution()
{
this->pixelReader = NULL;
this->screenReader = NULL;
}
void KeyingDespillOperation::executePixel(float *color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[])
{
float pixelColor[4];
float screenColor[4];
this->pixelReader->read(pixelColor, x, y, sampler, inputBuffers);
this->screenReader->read(screenColor, x, y, sampler, inputBuffers);
int screen_primary_channel = get_pixel_primary_channel(screenColor);
float average_value, amount;
average_value = (pixelColor[0] + pixelColor[1] + pixelColor[2] - pixelColor[screen_primary_channel]) / 2.0f;
amount = pixelColor[screen_primary_channel] - average_value;
color[0] = pixelColor[0];
color[1] = pixelColor[1];
color[2] = pixelColor[2];
color[3] = pixelColor[3];
if (this->despillFactor * amount > 0) {
color[screen_primary_channel] = pixelColor[screen_primary_channel] - this->despillFactor * amount;
}
}
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