/*    This file is a part of PlaYUVer project
 *    Copyright (C) 2014-2018  by Joao Carreira   (jfmcarreira@gmail.com)
 *                                Luis Lucas      (luisfrlucas@gmail.com)
 *
 *    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.
 */

/**
 * \file     FrameDifference.cpp
 * \brief    Frame Difference module
 */

#include "FrameDifference.h"

FrameDifference::FrameDifference()
{
  /* Module Definition */
  m_iModuleAPI = MODULE_API_2;
  m_iModuleType = FRAME_PROCESSING_MODULE;
  m_pchModuleCategory = "Measurements";
  m_pchModuleName = "FrameDifference";
  m_pchModuleName = "Difference";
  m_pchModuleTooltip = "Measure the difference between two images (Y plane),  "
                       "Y1 - Y2, with max absolute diff of 128";
  m_uiModuleRequirements = MODULE_REQUIRES_NEW_WINDOW | MODULE_REQUIRES_OPTIONS;
  m_uiNumberOfFrames = MODULE_REQUIRES_TWO_FRAMES;

  m_cModuleOptions.addOptions() /**/
      ( "Bits per pixel", m_uiBitsPixel, "Bits per pixel (use zero to avoid scaling) [0]" );

  m_uiBitsPixel = 0;

  m_pcFrameDifference = NULL;
}

Bool FrameDifference::create( std::vector<PlaYUVerFrame*> apcFrameList )
{
  _BASIC_MODULE_API_2_CHECK_

  UInt uiMaxBitsPixel = 0;
  for( UInt i = 0; i < apcFrameList.size(); i++ )
  {
    if( !apcFrameList[i]->haveSameFmt( apcFrameList[0],
                                       PlaYUVerFrame::MATCH_COLOR_SPACE | PlaYUVerFrame::MATCH_RESOLUTION ) )
      return false;
    if( apcFrameList[i]->getBitsPel() > uiMaxBitsPixel )
    {
      uiMaxBitsPixel = apcFrameList[i]->getBitsPel();
    }
  }

  if( !m_uiBitsPixel )
  {
    m_uiBitsPixel = ( uiMaxBitsPixel + 1 ) & 0x0F;
  }

  m_iDiffBitShift = ( uiMaxBitsPixel + 1 ) - m_uiBitsPixel;
  m_iMaxDiffValue = ( 1 << ( m_uiBitsPixel - 1 ) );

  m_pcFrameDifference = new PlaYUVerFrame( apcFrameList[0]->getWidth(), apcFrameList[0]->getHeight(),
                                           PlaYUVerFrame::GRAY, m_uiBitsPixel );
  return true;
}

PlaYUVerFrame* FrameDifference::process( std::vector<PlaYUVerFrame*> apcFrameList )
{
  Pel* pInput1PelYUV = apcFrameList[0]->getPelBufferYUV()[0][0];
  Pel* pInput2PelYUV = apcFrameList[1]->getPelBufferYUV()[0][0];
  Pel* pOutputPelYUV = m_pcFrameDifference->getPelBufferYUV()[0][0];
  Int aux_pel_1, aux_pel_2;
  Int diff = 0;

  for( UInt y = 0; y < m_pcFrameDifference->getHeight(); y++ )
    for( UInt x = 0; x < m_pcFrameDifference->getWidth(); x++ )
    {
      aux_pel_1 = *pInput1PelYUV++;
      aux_pel_2 = *pInput2PelYUV++;
      diff = aux_pel_1 - aux_pel_2;
      diff = m_iDiffBitShift > 0 ? diff >> m_iDiffBitShift : diff << m_iDiffBitShift;
      diff = std::min( diff, m_iMaxDiffValue - 1 );
      diff = std::max( diff, -m_iMaxDiffValue );

      diff += m_iMaxDiffValue;
      *pOutputPelYUV++ = diff;
    }
  return m_pcFrameDifference;
}

Void FrameDifference::destroy()
{
  if( m_pcFrameDifference )
    delete m_pcFrameDifference;
  m_pcFrameDifference = NULL;
}