103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributor:
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* Jeroen Bakker
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* Monique Dewanchand
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*/
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#include "COM_CalculateStandardDeviationOperation.h"
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#include "BLI_math.h"
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#include "BLI_utildefines.h"
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extern "C" {
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#include "IMB_colormanagement.h"
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}
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CalculateStandardDeviationOperation::CalculateStandardDeviationOperation() : CalculateMeanOperation()
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{
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/* pass */
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}
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void CalculateStandardDeviationOperation::executePixel(float output[4],
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int /*x*/, int /*y*/,
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void * /*data*/)
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{
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output[0] = this->m_standardDeviation;
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}
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void *CalculateStandardDeviationOperation::initializeTileData(rcti *rect)
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{
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lockMutex();
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if (!this->m_iscalculated) {
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MemoryBuffer *tile = (MemoryBuffer *)this->m_imageReader->initializeTileData(rect);
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CalculateMeanOperation::calculateMean(tile);
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this->m_standardDeviation = 0.0f;
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float *buffer = tile->getBuffer();
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int size = tile->getWidth() * tile->getHeight();
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int pixels = 0;
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float sum = 0.0f;
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float mean = this->m_result;
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for (int i = 0, offset = 0; i < size; i++, offset += 4) {
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if (buffer[offset + 3] > 0) {
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pixels++;
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switch (this->m_setting) {
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case 1: /* rgb combined */
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{
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float value = IMB_colormanagement_get_luminance(&buffer[offset]);
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sum += (value - mean) * (value - mean);
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break;
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}
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case 2: /* red */
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{
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float value = buffer[offset];
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sum += value;
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sum += (value - mean) * (value - mean);
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break;
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}
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case 3: /* green */
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{
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float value = buffer[offset + 1];
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sum += value;
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sum += (value - mean) * (value - mean);
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break;
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}
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case 4: /* blue */
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{
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float value = buffer[offset + 2];
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sum += value;
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sum += (value - mean) * (value - mean);
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break;
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}
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case 5: /* luminance */
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{
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float yuv[3];
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rgb_to_yuv(buffer[offset], buffer[offset + 1], buffer[offset + 2], &yuv[0], &yuv[1], &yuv[2]);
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sum += (yuv[0] - mean) * (yuv[0] - mean);
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break;
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}
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}
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}
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}
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this->m_standardDeviation = sqrt(sum / (float)(pixels - 1));
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this->m_iscalculated = true;
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}
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unlockMutex();
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return NULL;
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}
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