text: /*
   * 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_KeyingClipOperation.h"
  
  #include "MEM_guardedalloc.h"
  
  #include "BLI_listbase.h"
  #include "BLI_math.h"
  
  KeyingClipOperation::KeyingClipOperation() : NodeOperation()
  {
  	this->addInputSocket(COM_DT_VALUE);
  	this->addOutputSocket(COM_DT_VALUE);
  
  	this->m_kernelRadius = 3;
  	this->m_kernelTolerance = 0.1f;
  
  	this->m_clipBlack = 0.0f;
  	this->m_clipWhite = 1.0f;
  
  	this->m_isEdgeMatte = false;
  
  	this->setComplex(true);
  }
  
  void *KeyingClipOperation::initializeTileData(rcti *rect)
  {
  	void *buffer = getInputOperation(0)->initializeTileData(rect);
  
  	return buffer;
  }
  
  void KeyingClipOperation::executePixel(float output[4], int x, int y, void *data)
  {
  	const int delta = this->m_kernelRadius;
  	const float tolerance = this->m_kernelTolerance;
  
  	MemoryBuffer *inputBuffer = (MemoryBuffer *)data;
  	float *buffer = inputBuffer->getBuffer();
  
  	int bufferWidth = inputBuffer->getWidth();
  	int bufferHeight = inputBuffer->getHeight();
  
  	float value = buffer[(y * bufferWidth + x)];
  
  	bool ok = false;
  	int start_x = max_ff(0, x - delta + 1),
  	    start_y = max_ff(0, y - delta + 1),
  	    end_x = min_ff(x + delta - 1, bufferWidth - 1),
  	    end_y = min_ff(y + delta - 1, bufferHeight - 1);
  
  	int count = 0, totalCount = (end_x - start_x + 1) * (end_y - start_y + 1) - 1;
  	int thresholdCount = ceil((float) totalCount * 0.9f);
  
  	if (delta == 0) {
  		ok = true;
  	}
  
  	for (int cx = start_x; ok == false && cx <= end_x; ++cx) {
  		for (int cy = start_y; ok == false && cy <= end_y; ++cy) {
  			if (UNLIKELY(cx == x && cy == y)) {
  				continue;
  			}
  
  			int bufferIndex = (cy * bufferWidth + cx);
  			float currentValue = buffer[bufferIndex];
  
  			if (fabsf(currentValue - value) < tolerance) {
  				count++;
  				if (count >= thresholdCount) {
  					ok = true;
  				}
  			}
  		}
  	}
  
  	if (this->m_isEdgeMatte) {
  		if (ok)
  			output[0] = 0.0f;
  		else
  			output[0] = 1.0f;
  	}
  	else {
  		output[0] = value;
  
  		if (ok) {
  			if (output[0] < this->m_clipBlack)
  				output[0] = 0.0f;
  			else if (output[0] >= this->m_clipWhite)
  				output[0] = 1.0f;
  			else
  				output[0] = (output[0] - this->m_clipBlack) / (this->m_clipWhite - this->m_clipBlack);
  		}
  	}
  }
  
  bool KeyingClipOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output)
  {
  	rcti newInput;
  
  	newInput.xmin = input->xmin - this->m_kernelRadius;
  	newInput.ymin = input->ymin - this->m_kernelRadius;
  	newInput.xmax = input->xmax + this->m_kernelRadius;
  	newInput.ymax = input->ymax + this->m_kernelRadius;
  
  	return NodeOperation::determineDependingAreaOfInterest(&newInput, readOperation, output);
  }
  