/*
 * 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_CalculateMeanOperation.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"



CalculateMeanOperation::CalculateMeanOperation(): NodeOperation() {
	this->addInputSocket(COM_DT_COLOR, COM_SC_NO_RESIZE);
	this->addOutputSocket(COM_DT_VALUE);
	this->imageReader = NULL;
	this->iscalculated = false;
	this->setting = 1;
	this->setComplex(true);
}
void CalculateMeanOperation::initExecution() {
	this->imageReader = this->getInputSocketReader(0);
	this->iscalculated = false;
	NodeOperation::initMutex();
}

void CalculateMeanOperation::executePixel(float* color, int x, int y, MemoryBuffer *inputBuffers[], void * data) {
	color[0] = this->result;
}

void CalculateMeanOperation::deinitExecution() {
	this->imageReader = NULL;
	NodeOperation::deinitMutex();
}

bool CalculateMeanOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output) {
	rcti imageInput;
	if (iscalculated) {
		return false;
	}
	NodeOperation* operation = getInputOperation(0);
	imageInput.xmax = operation->getWidth();
	imageInput.xmin = 0;
	imageInput.ymax = operation->getHeight();
	imageInput.ymin = 0;
	if (operation->determineDependingAreaOfInterest(&imageInput, readOperation, output) ) {
		return true;
	}
	return false;
}

void* CalculateMeanOperation::initializeTileData(rcti *rect, MemoryBuffer **memoryBuffers) {
	BLI_mutex_lock(getMutex());
	if (!this->iscalculated) {
		MemoryBuffer* tile = (MemoryBuffer*)imageReader->initializeTileData(rect, memoryBuffers);
		calculateMean(tile);
		this->iscalculated = true;
	}
	BLI_mutex_unlock(getMutex());
	return NULL;
}

void CalculateMeanOperation::calculateMean(MemoryBuffer * tile) {
	this->result = 0.0f;
	float* buffer = tile->getBuffer();
	int size = tile->getWidth()*tile->getHeight();
	int pixels = 0;
	float sum;
	for (int i = 0, offset = 0 ; i < size ; i ++, offset +=4) {
		if (buffer[offset+3] > 0) {
			pixels ++;
	
			switch (this->setting)
			{
			case 1:
				{
					sum += buffer[offset]*0.35f + buffer[offset+1]*0.45f + buffer[offset+2]*0.2f;
					break;
				}
			case 2:
				{
				sum+= buffer[offset];
					break;
				}
			case 3:
				{
				sum+= buffer[offset+1];
					break;
				}
			case 4:
				{
				sum+= buffer[offset+2];
					break;
				}
			case 5:
				{
					float yuv[3];
					rgb_to_yuv(buffer[offset], buffer[offset+1], buffer[offset+2], &yuv[0], &yuv[1], &yuv[2]);
					sum+=yuv[0];
					break;
				}
			}
		}
	}
	this->result = sum / pixels;
}