99 lines
2.7 KiB
C++
99 lines
2.7 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:
|
|
* Jeroen Bakker
|
|
* Monique Dewanchand
|
|
*/
|
|
|
|
#include "COM_CalculateStandardDeviationOperation.h"
|
|
#include "BLI_math.h"
|
|
#include "BLI_utildefines.h"
|
|
|
|
|
|
|
|
CalculateStandardDeviationOperation::CalculateStandardDeviationOperation() : CalculateMeanOperation()
|
|
{
|
|
/* pass */
|
|
}
|
|
|
|
void CalculateStandardDeviationOperation::executePixel(float output[4], int x, int y, void *data)
|
|
{
|
|
output[0] = this->m_standardDeviation;
|
|
}
|
|
|
|
void *CalculateStandardDeviationOperation::initializeTileData(rcti *rect)
|
|
{
|
|
lockMutex();
|
|
if (!this->m_iscalculated) {
|
|
MemoryBuffer *tile = (MemoryBuffer *)this->m_imageReader->initializeTileData(rect);
|
|
CalculateMeanOperation::calculateMean(tile);
|
|
this->m_standardDeviation = 0.0f;
|
|
float *buffer = tile->getBuffer();
|
|
int size = tile->getWidth() * tile->getHeight();
|
|
int pixels = 0;
|
|
float sum = 0.0f;
|
|
float mean = this->m_result;
|
|
for (int i = 0, offset = 0; i < size; i++, offset += 4) {
|
|
if (buffer[offset + 3] > 0) {
|
|
pixels++;
|
|
|
|
switch (this->m_setting) {
|
|
case 1: /* rgb combined */
|
|
{
|
|
float value = rgb_to_bw(&buffer[offset]);
|
|
sum += (value - mean) * (value - mean);
|
|
break;
|
|
}
|
|
case 2: /* red */
|
|
{
|
|
float value = buffer[offset];
|
|
sum += value;
|
|
sum += (value - mean) * (value - mean);
|
|
break;
|
|
}
|
|
case 3: /* green */
|
|
{
|
|
float value = buffer[offset + 1];
|
|
sum += value;
|
|
sum += (value - mean) * (value - mean);
|
|
break;
|
|
}
|
|
case 4: /* blue */
|
|
{
|
|
float value = buffer[offset + 2];
|
|
sum += value;
|
|
sum += (value - mean) * (value - mean);
|
|
break;
|
|
}
|
|
case 5: /* luminance */
|
|
{
|
|
float yuv[3];
|
|
rgb_to_yuv(buffer[offset], buffer[offset + 1], buffer[offset + 2], &yuv[0], &yuv[1], &yuv[2]);
|
|
sum += (yuv[0] - mean) * (yuv[0] - mean);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
this->m_standardDeviation = sqrt(sum / (float)(pixels - 1));
|
|
this->m_iscalculated = true;
|
|
}
|
|
unlockMutex();
|
|
return NULL;
|
|
}
|