#include "iwa_glarefx.h"

#include "trop.h"

#include "tdoubleparam.h"

#include "trasterfx.h"

#include "trasterimage.h"

#include "tparamuiconcept.h"

#include "kiss_fft.h"

#include "iwa_cie_d65.h"

#include "iwa_xyz.h"

#include "iwa_simplexnoise.h"

#include <random></random>

#include <qpair></qpair>

#include <qvector></qvector>

#include <qreadwritelock></qreadwritelock>

#include <qmutexlocker></qmutexlocker>

#include <qmap></qmap>

#include <qimage></qimage>

#include <qpainter></qpainter>

namespace {

// FFT coordinate -> Normal corrdinate

inline int getCoord(int i, int j, int lx, int ly) {

  int cx = i - lx / 2;

  int cy = j - ly / 2;

  if (cx < 0) cx += lx;

  if (cy < 0) cy += ly;

  return cy * lx + cx;

}

};  // namespace

//--------------------------------------------

// Iwa_GlareFx

//--------------------------------------------

Iwa_GlareFx::Iwa_GlareFx()

    : m_renderMode(

          new TIntEnumParam(RenderMode_FilterPreview, "Filter Preview"))

    , m_irisMode(new TIntEnumParam(Iris_InputImage, "Input Image"))

    , m_irisScale(0.2)

    , m_irisGearEdgeCount(10)

    , m_irisRandomSeed(0)

    , m_irisSymmetry(1.0)

    , m_irisAppearance(new TIntEnumParam())

    , m_intensity(0.0)

    , m_size(100.0)

    , m_rotation(0.0)

    , m_aberration(1.0)

    , m_noise_factor(0.0)

    , m_noise_size(0.5)

    , m_noise_octave(new TIntEnumParam(1, "1"))

    , m_noise_evolution(0.0)

    , m_noise_offset(TPointD(0, 0)) {

  // Version 1 : lights had been constantly summed in all wavelength

  // Version 2 : intensities are weighted proportional to 1/(rambda^2)

  // Version 3 : * 1/2.2 gamma to intensity when non-linear rendering

  //             Source image is separated in each RGB channels

  //             Filter is normalized with sum of green channel values

  setFxVersion(3);

  // Bind the common parameters

  addInputPort("Source", m_source);

  addInputPort("Iris", m_iris);

  bindParam(this, "renderMode", m_renderMode);

  m_renderMode->addItem(RenderMode_Render, "Render");

  m_renderMode->addItem(RenderMode_Iris, "Iris");

  bindParam(this, "irisMode", m_irisMode);

  m_irisMode->addItem(Iris_Square, "4 Streaks");

  m_irisMode->addItem(Iris_Hexagon, "6 Streaks");

  m_irisMode->addItem(Iris_Octagon, "8 Streaks");

  m_irisMode->addItem(Iris_GearShape, "Multiple Streaks");

  bindParam(this, "irisScale", m_irisScale);

  bindParam(this, "irisGearEdgeCount", m_irisGearEdgeCount);

  bindParam(this, "irisRandomSeed", m_irisRandomSeed);

  bindParam(this, "irisSymmetry", m_irisSymmetry);

  bindParam(this, "irisAppearance", m_irisAppearance);

  m_irisAppearance->addItem(Appearance_ThinLine, "Thin Line");

  m_irisAppearance->addItem(Appearance_MediumLine, "Medium Line");

  m_irisAppearance->addItem(Appearance_ThickLine, "Thick Line");

  m_irisAppearance->addItem(Appearance_Fill, "Filled");

  m_irisAppearance->setValue(Appearance_MediumLine);

  bindParam(this, "intensity", m_intensity, false);

  bindParam(this, "size", m_size, false);

  m_size->setMeasureName("fxLength");

  bindParam(this, "rotation", m_rotation, false);

  bindParam(this, "aberration", m_aberration, false);

  bindParam(this, "noise_factor", m_noise_factor, false);

  bindParam(this, "noise_size", m_noise_size, false);

  bindParam(this, "noise_octave", m_noise_octave, false);

  m_noise_octave->addItem(2, "2");

  m_noise_octave->addItem(3, "3");

  bindParam(this, "noise_evolution", m_noise_evolution, false);

  bindParam(this, "noise_offset", m_noise_offset, false);

  m_noise_offset->getX()->setMeasureName("fxLength");

  m_noise_offset->getY()->setMeasureName("fxLength");

  m_irisScale->setValueRange(0.1, 0.8);

  m_irisGearEdgeCount->setValueRange(3, 50);

  m_irisSymmetry->setValueRange(0.1, 1.0);

  m_irisRandomSeed->setValueRange(0, (std::numeric_limits<int>::max)());</int>

  m_intensity->setValueRange(-5.0, 5.0);

  m_size->setValueRange(10.0, 1500.0);

  m_rotation->setValueRange(-1800, 1800);

  m_aberration->setValueRange(-2.0, 2.0);

  m_noise_factor->setValueRange(0.0, 1.0);

  m_noise_size->setValueRange(0.01, 3.0);

  enableComputeInFloat(true);

}

//--------------------------------------------------------------

double Iwa_GlareFx::getSizePixelAmount(const double val, const TAffine affine) {

  /*--- Convert to vector --- */

  TPointD vect;

  vect.x = val;

  vect.y = 0.0;

  /*--- Apply geometrical transformation ---*/

  // For the following lines I referred to lines 586-592 of

  // sources/stdfx/motionblurfx.cpp

  TAffine aff(affine);

  aff.a13 = aff.a23 = 0; /* ignore translation */

  vect              = aff * vect;

  /*--- return the length of the vector ---*/

  return sqrt(vect.x * vect.x + vect.y * vect.y);

}

//--------------------------------------------------------------

void Iwa_GlareFx::drawPresetIris(TRaster32P irisRas, double irisSize,

                                 const double frame) {

  QImage img(irisRas->getLx(), irisRas->getLy(),

             QImage::Format_ARGB32_Premultiplied);

  img.fill(Qt::black);

  QPainter painter(&img);

  painter.setRenderHint(QPainter::Antialiasing, true);

  painter.translate(

      QPointF((float)irisRas->getLx() / 2.0, (float)irisRas->getLy() / 2.0));

  painter.scale(irisSize, irisSize);

  // shrink a bit

  painter.scale(0.9, 0.9);

  QPen pen(Qt::white);

  double lineWidthRatio;

  int appearance = m_irisAppearance->getValue();

  if (appearance == Appearance_Fill) {

    painter.setPen(Qt::NoPen);

    painter.setBrush(Qt::white);

  } else {

    assert(appearance >= 0 && appearance <= 2);

    pen.setCapStyle(Qt::RoundCap);

    pen.setJoinStyle(Qt::MiterJoin);

    double ratio[3] = {0.05, 0.1, 0.2};

    lineWidthRatio  = ratio[appearance];

    pen.setWidthF(lineWidthRatio);

    painter.setPen(pen);

    painter.setBrush(Qt::NoBrush);

  }

  double symmetry = m_irisSymmetry->getValue(frame);

  switch (m_irisMode->getValue()) {

  case Iris_Square:

    painter.scale(1.0, symmetry);

    painter.drawRect(QRectF(-1.0, -1.0, 2.0, 2.0));

    break;

  case Iris_Hexagon: {

    QPointF p(1.0 - 0.5 * symmetry, symmetry * std::sqrt(3) * 0.5);

    const QPointF points[6] = {-p, QPointF(-1.0, 0.0), QPointF(-p.x(), p.y()),

                               p,  QPointF(1.0, 0.0),  QPointF(p.x(), -p.y())};

    if (appearance != Appearance_Fill) {

      if (symmetry < 1.0) {

        painter.drawPolyline(points, 3);

        painter.drawPolyline(&points[3], 3);

      }

      pen.setWidthF(lineWidthRatio * symmetry);

      painter.setPen(pen);

    }

    painter.drawPolygon(points, 6);

    if (appearance != Appearance_Fill && symmetry < 1.0) {

      pen.setColor(Qt::black);

      painter.setPen(pen);

      painter.setBrush(Qt::NoBrush);

      painter.drawRect(

          QRectF(-1.2, -p.y() - symmetry, 2.4, (p.y() + symmetry) * 2.0));

    }

  } break;

  case Iris_Octagon: {

    double u = (2 + std::sqrt(2) * (1 - symmetry)) / (2 * std::sqrt(2) + 2);

    double v = (2 + std::sqrt(2) * (1 + symmetry)) / (2 * std::sqrt(2) + 2);

    const QPointF points[8] = {QPointF(u, v),  QPointF(v, u),   QPointF(v, -u),

                               QPointF(u, -v), QPointF(-u, -v), QPointF(-v, -u),

                               QPointF(-v, u), QPointF(-u, v)};

    if (appearance != Appearance_Fill) {

      if (symmetry < 1.0) {

        painter.drawLine(points[0], points[1]);

        painter.drawLine(points[2], points[3]);

        painter.drawLine(points[4], points[5]);

        painter.drawLine(points[6], points[7]);

      }

      pen.setWidthF(lineWidthRatio * symmetry);

      painter.setPen(pen);

    }

    painter.drawPolygon(points, 8);

    if (appearance != Appearance_Fill && symmetry < 1.0) {

      pen.setColor(Qt::black);

      painter.setPen(pen);

      painter.setBrush(Qt::NoBrush);

      painter.drawRect(QRectF(-v - symmetry, -v - symmetry,

                              (v + symmetry) * 2.0, (v + symmetry) * 2.0));

    }

  } break;

  case Iris_GearShape: {

    int edgeCount   = (int)std::round(m_irisGearEdgeCount->getValue(frame));

    QPointF* points = new QPointF[edgeCount * 2];

    QList<double> thickness;</double>

    double angleUnit = M_PI / (double)edgeCount;

    std::mt19937_64 mt;

    mt.seed(m_irisRandomSeed->getValue());

    std::uniform_real_distribution<> random_plusminus1(-1.0, 1.0);

    std::uniform_real_distribution<> random_thickness(symmetry * lineWidthRatio,

                                                      lineWidthRatio);

    for (int e = 0; e < edgeCount; e++) {

      double baseAngle = angleUnit * e * 2.0;

      double theta =

          baseAngle + random_plusminus1(mt) * angleUnit * (1.0 - symmetry);

      points[e * 2] = QPointF(std::cos(theta), std::sin(theta));

      thickness.append(random_thickness(mt));

      baseAngle += angleUnit;

      theta = baseAngle + random_plusminus1(mt) * angleUnit * (1.0 - symmetry);

      points[e * 2 + 1] = QPointF(0.5 * std::cos(theta), 0.5 * std::sin(theta));

      thickness.append(random_thickness(mt));

    }

    if (appearance != Appearance_Fill) {

      for (int v = 0; v < edgeCount * 2; v++) {

        int next_v = (v == edgeCount * 2 - 1) ? 0 : v + 1;

        pen.setWidthF(thickness.at(v));

        painter.setPen(pen);

        painter.drawLine(points[v], points[next_v]);

      }

    } else {

      painter.drawPolygon(points, edgeCount * 2);

    }

    delete[] points;

  } break;

  default:

    break;

  }

  for (int j = 0; j < img.height(); j++) {

    TPixel32* pix = irisRas->pixels(j);

    QRgb* img_p   = (QRgb*)img.scanLine(img.height() - j - 1);

    for (int i = 0; i < img.width(); i++, img_p++, pix++) {

      pix->r = (unsigned char)(qRed(*img_p));

      pix->g = (unsigned char)(qGreen(*img_p));

      pix->b = (unsigned char)(qBlue(*img_p));

      pix->m = (unsigned char)(qAlpha(*img_p));

    }

  }

}

//--------------------------------------------------------------

void Iwa_GlareFx::doCompute(TTile& tile, double frame,

                            const TRenderSettings& settings) {

  int irisMode = m_irisMode->getValue();

  // If the iris is not connected, then do nothing

  if (irisMode == Iris_InputImage && !m_iris.isConnected()) {

    tile.getRaster()->clear();

    return;

  }

  int renderMode = m_renderMode->getValue();

  // If the source is not connected & it is render mode, then do nothing.

  if (!m_source.isConnected() && renderMode == RenderMode_Render) {

    tile.getRaster()->clear();

    return;

  }

  // Get the original size of Iris image

  TRectD irisBBox;

  TTile irisTile;

  TRasterP irisRas;

  double size = getSizePixelAmount(m_size->getValue(frame), settings.m_affine);

  if (irisMode == Iris_InputImage) {

    m_iris->getBBox(frame, irisBBox, settings);

    // Compute the iris tile.

    m_iris->allocateAndCompute(

        irisTile, irisBBox.getP00(),

        TDimension(static_cast<int>(irisBBox.getLx() + 0.5),</int>

                   static_cast<int>(irisBBox.getLy() + 0.5)),</int>

        tile.getRaster(), frame, settings);

    irisRas = irisTile.getRaster();

  } else {

    // obtain iris bbox based on the glare pattern size

    double irisSize = size * m_irisScale->getValue(frame);

    irisBBox        = TRectD(-irisSize, -irisSize, irisSize, irisSize);

    int dimIrisRas  = int(std::ceil(irisSize) * 2.0);

    irisRas         = TRaster32P(dimIrisRas, dimIrisRas);

    drawPresetIris(irisRas, irisSize, frame);

  }

  if (renderMode == RenderMode_Iris) {

    TTranslation aff(

        (double)(tile.getRaster()->getLx() - irisRas->getLx()) * 0.5,

        (double)(tile.getRaster()->getLy() - irisRas->getLy()) * 0.5);

    TRop::quickPut(tile.getRaster(), irisRas, aff);

    return;

  }

  int dimIris = int(std::ceil(size) * 2.0);

  dimIris     = kiss_fft_next_fast_size(dimIris);

  while ((tile.getRaster()->getSize().lx - dimIris) % 2 != 0)

    dimIris = kiss_fft_next_fast_size(dimIris + 1);

  double irisResizeFactor = double(dimIris) * 0.5 / size;

  bool isLinear = tile.getRaster()->isLinear();

  kiss_fft_cpx* kissfft_comp_iris;

  // create the iris data for FFT (in the same size as the source tile)

  TRasterGR8P kissfft_comp_iris_ras(dimIris * sizeof(kiss_fft_cpx), dimIris);

  kissfft_comp_iris_ras->lock();

  kissfft_comp_iris = (kiss_fft_cpx*)kissfft_comp_iris_ras->getRawData();

  {

    // Create the Iris image for FFT

    kiss_fft_cpx* kissfft_comp_iris_before;

    TRasterGR8P kissfft_comp_iris_before_ras(dimIris * sizeof(kiss_fft_cpx),

                                             dimIris);

    kissfft_comp_iris_before_ras->lock();

    kissfft_comp_iris_before =

        (kiss_fft_cpx*)kissfft_comp_iris_before_ras->getRawData();

    convertIris(kissfft_comp_iris_before, dimIris, irisBBox, irisRas);

    // Create the FFT plan for the iris image.

    kiss_fftnd_cfg iris_kissfft_plan;

    while (1) {

      int dims[2]       = {dimIris, dimIris};

      int ndims         = 2;

      iris_kissfft_plan = kiss_fftnd_alloc(dims, ndims, false, 0, 0);

      if (iris_kissfft_plan != NULL) break;

    }

    // Do FFT the iris image.

    kiss_fftnd(iris_kissfft_plan, kissfft_comp_iris_before, kissfft_comp_iris);

    kiss_fft_free(iris_kissfft_plan);

    kissfft_comp_iris_before_ras->unlock();

  }

  double3* glare_pattern;

  TRasterGR8P glare_pattern_ras(dimIris * sizeof(double3), dimIris);

  glare_pattern = (double3*)glare_pattern_ras->getRawData();

  glare_pattern_ras->lock();

  // Resize the power spectrum according to each wavelength and combine into the

  // glare pattern

  double intensity = m_intensity->getValue(frame);

  powerSpectrum2GlarePattern(frame, settings.m_affine, kissfft_comp_iris,

                             glare_pattern, dimIris, intensity,

                             irisResizeFactor);

  kissfft_comp_iris_ras->unlock();

  // clear the raster memory

  tile.getRaster()->clear();

  TRaster32P ras32 = tile.getRaster();

  TRaster64P ras64 = tile.getRaster();

  TRasterFP rasF   = tile.getRaster();

  // if (ras32)

  //   ras32->fill(TPixel32::Transparent);

  // else if (ras64)

  //   ras64->fill(TPixel64::Transparent);

  // else if (rasF)

  //   rasF->fill(TPixelF::Transparent);

  // filter preview mode

  if (renderMode == RenderMode_FilterPreview) {

    int2 margin = {(dimIris - tile.getRaster()->getSize().lx) / 2,

                   (dimIris - tile.getRaster()->getSize().ly) / 2};

    if (ras32)

      setFilterPreviewToResult<traster32p, tpixel32="">(ras32, glare_pattern,</traster32p,>

                                                     dimIris, margin);

    else if (ras64)

      setFilterPreviewToResult<traster64p, tpixel64="">(ras64, glare_pattern,</traster64p,>

                                                     dimIris, margin);

    else if (rasF)

      setFilterPreviewToResult<trasterfp, tpixelf="">(rasF, glare_pattern, dimIris,</trasterfp,>

                                                   margin);

    if (getFxVersion() >= 3 && !isLinear) {

      tile.getRaster()->setLinear(true);

      TRop::tosRGB(tile.getRaster(), settings.m_colorSpaceGamma);

    }

    return;

  }

  // render mode

  // Range of computation

  TRectD _rectOut(tile.m_pos, TDimensionD(tile.getRaster()->getLx(),

                                          tile.getRaster()->getLy()));

  _rectOut = _rectOut.enlarge(static_cast<double>(dimIris / 2));</double>

  TDimensionI dimOut(static_cast<int>(_rectOut.getLx() + 0.5),</int>

                     static_cast<int>(_rectOut.getLy() + 0.5));</int>

  // Enlarge the size to the "fast size" for kissfft which has no factors other

  // than 2,3, or 5.

  if (dimOut.lx < 10000 && dimOut.ly < 10000) {

    int new_x = kiss_fft_next_fast_size(dimOut.lx);

    int new_y = kiss_fft_next_fast_size(dimOut.ly);

    // margin should be integer

    while ((new_x - dimOut.lx) % 2 != 0)

      new_x = kiss_fft_next_fast_size(new_x + 1);

    while ((new_y - dimOut.ly) % 2 != 0)

      new_y = kiss_fft_next_fast_size(new_y + 1);

    _rectOut = _rectOut.enlarge(static_cast<double>(new_x - dimOut.lx) / 2.0,</double>

                                static_cast<double>(new_y - dimOut.ly) / 2.0);</double>

    dimOut.lx = new_x;

    dimOut.ly = new_y;

  }

  kiss_fft_cpx* kissfft_comp_tmp;

  kiss_fft_cpx* kissfft_comp_glare;

  kiss_fft_cpx* kissfft_comp_source;

  TRasterGR8P kissfft_comp_tmp_ras(dimOut.lx * sizeof(kiss_fft_cpx), dimOut.ly);

  TRasterGR8P kissfft_comp_glare_ras(dimOut.lx * sizeof(kiss_fft_cpx),

                                     dimOut.ly);

  TRasterGR8P kissfft_comp_source_ras(dimOut.lx * sizeof(kiss_fft_cpx),

                                      dimOut.ly);

  kissfft_comp_tmp    = (kiss_fft_cpx*)kissfft_comp_tmp_ras->getRawData();

  kissfft_comp_glare  = (kiss_fft_cpx*)kissfft_comp_glare_ras->getRawData();

  kissfft_comp_source = (kiss_fft_cpx*)kissfft_comp_source_ras->getRawData();

  kissfft_comp_tmp_ras->lock();

  kissfft_comp_glare_ras->lock();

  kissfft_comp_source_ras->lock();

  int dims[2]              = {dimOut.ly, dimOut.lx};

  int ndims                = 2;

  kiss_fftnd_cfg plan_fwd  = kiss_fftnd_alloc(dims, ndims, false, 0, 0);

  kiss_fftnd_cfg plan_bkwd = kiss_fftnd_alloc(dims, ndims, true, 0, 0);

  // obtain the source tile

  TTile sourceTile;

  m_source->allocateAndCompute(sourceTile, _rectOut.getP00(), dimOut,

                               tile.getRaster(), frame, settings);

  if (getFxVersion() >= 3 && !isLinear)

    TRop::toLinearRGB(sourceTile.getRaster(), settings.m_colorSpaceGamma);

  // store the source image to tmp

  if (getFxVersion() < 3) {

    if (ras32)

      setSourceTileToBuffer<traster32p, tpixel32="">(sourceTile.getRaster(),</traster32p,>

                                                  kissfft_comp_tmp);

    else if (ras64)

      setSourceTileToBuffer<traster64p, tpixel64="">(sourceTile.getRaster(),</traster64p,>

                                                  kissfft_comp_tmp);

    else if (rasF)

      setSourceTileToBuffer<trasterfp, tpixelf="">(sourceTile.getRaster(),</trasterfp,>

                                                kissfft_comp_tmp);

    // FFT the source

    kiss_fftnd(plan_fwd, kissfft_comp_tmp, kissfft_comp_source);

  }

  // compute for each rgb channels

  for (int ch = 0; ch < 3; ch++) {

    // store the source image to tmp for each channel

    if (getFxVersion() >= 3) {

      if (ras32)

        setSourceTileToBuffer<traster32p, tpixel32="">(sourceTile.getRaster(),</traster32p,>

                                                    kissfft_comp_tmp, ch);

      else if (ras64)

        setSourceTileToBuffer<traster64p, tpixel64="">(sourceTile.getRaster(),</traster64p,>

                                                    kissfft_comp_tmp, ch);

      else if (rasF)

        setSourceTileToBuffer<trasterfp, tpixelf="">(sourceTile.getRaster(),</trasterfp,>

                                                  kissfft_comp_tmp, ch);

      // FFT the source

      kiss_fftnd(plan_fwd, kissfft_comp_tmp, kissfft_comp_source);

    }

    kissfft_comp_tmp_ras->clear();

    // store the glare pattern to tmp

    setGlarePatternToBuffer(glare_pattern, kissfft_comp_tmp, ch, dimIris,

                            dimOut);

    // FFT the glare pattern

    kiss_fftnd(plan_fwd, kissfft_comp_tmp, kissfft_comp_glare);

    // multiply the glare and the source

    multiplyFilter(kissfft_comp_glare, kissfft_comp_source,

                   dimOut.lx * dimOut.ly);

    // Backward-FFT the glare pattern to tmp

    kiss_fftnd(plan_bkwd, kissfft_comp_glare,

               kissfft_comp_tmp);  // Backward FFT

    // convert tmp to channel values, store it into the tile

    if (ras32)

      setChannelToResult<traster32p, tpixel32="">(ras32, kissfft_comp_tmp, ch,</traster32p,>

                                               dimOut);

    else if (ras64)

      setChannelToResult<traster64p, tpixel64="">(ras64, kissfft_comp_tmp, ch,</traster64p,>

                                               dimOut);

    else if (rasF)

      setChannelToResult<trasterfp, tpixelf="">(rasF, kissfft_comp_tmp, ch,</trasterfp,>

                                             dimOut);

  }

  if (getFxVersion() >= 3 && !isLinear) {

    tile.getRaster()->setLinear(true);

    TRop::tosRGB(tile.getRaster(), settings.m_colorSpaceGamma);

  }

  kiss_fft_free(plan_fwd);

  kiss_fft_free(plan_bkwd);

  kissfft_comp_source_ras->unlock();

  kissfft_comp_glare_ras->unlock();

}

//------------------------------------------------

void Iwa_GlareFx::powerSpectrum2GlarePattern(

    const double frame, const TAffine affine, kiss_fft_cpx* spectrum,

    double3* glare, int dimIris, double intensity, double irisResizeFactor) {

  auto lerp = [](double val1, double val2, double ratio) {

    return val1 * (1.0 - ratio) + val2 * ratio;

  };

  auto lerpGlarePtn = [&](double i, double j, double* gp) {

    int iId[2], jId[2];

    double iRatio, jRatio;

    iId[0] = int(i);

    iId[1] = (iId[0] < dimIris - 1) ? iId[0] + 1 : iId[0];

    iRatio = i - double(iId[0]);

    jId[0] = int(j);

    jId[1] = (jId[0] < dimIris - 1) ? jId[0] + 1 : jId[0];

    jRatio = j - double(jId[0]);

    if (iRatio == 0.0 && jRatio == 0.0) return gp[jId[0] * dimIris + iId[0]];

    return lerp(lerp(gp[jId[0] * dimIris + iId[0]],

                     gp[jId[0] * dimIris + iId[1]], iRatio),

                lerp(gp[jId[1] * dimIris + iId[0]],

                     gp[jId[1] * dimIris + iId[1]], iRatio),

                jRatio);

  };

  double factor =

      (m_renderMode->getValue() == RenderMode_FilterPreview) ? -5 : -11;

  double* glarePattern_p;

  TRasterGR8P glarePattern_ras(dimIris * sizeof(double), dimIris);

  glarePattern_p = (double*)glarePattern_ras->getRawData();

  glarePattern_ras->lock();

  double* g_p = glarePattern_p;

  double intensityFactor =

      (getFxVersion() < 3) ? std::exp(intensity + factor) : 1.0;

  for (int j = 0; j < dimIris; j++) {

    for (int i = 0; i < dimIris; i++, g_p++) {

      kiss_fft_cpx sp_p = spectrum[getCoord(i, j, dimIris, dimIris)];

      (*g_p) = sqrt(sp_p.r * sp_p.r + sp_p.i * sp_p.i) * intensityFactor;

    }

  }

  // distort the pattern with noise here

  double noise_factor = m_noise_factor->getValue(frame);

  double rotation     = m_rotation->getValue(frame);

  if (noise_factor > 0.0 || m_rotation != 0.0) {

    distortGlarePattern(frame, affine, glarePattern_p, dimIris);

  }

  double3* glare_xyz;

  TRasterGR8P glare_xyz_ras(dimIris * sizeof(double3), dimIris);

  glare_xyz_ras->lock();

  glare_xyz = (double3*)glare_xyz_ras->getRawData();

  glare_xyz_ras->clear();

  double irisRadius = double(dimIris / 2);

  double aberration = m_aberration->getValue(frame);

  // old version had summed each wavelength constantly.

  // it was not physically-collect but keep it in order to maintain backward

  // compatibility.

  bool isVersion1 = getFxVersion() < 2;

  // accumurate xyz values for each optical wavelength

  for (int ram = 0; ram < 34; ram++) {

    double rambda = 0.38 + 0.01 * (double)ram;

    // double scale = 0.55 / rambda;

    double scale = std::pow(0.55 / rambda, aberration);

    double intensity_scale =

        (isVersion1) ? 1.0 : std::pow(0.55 / rambda, 2.0 * aberration);

    scale *= irisResizeFactor;

    for (int j = 0; j < dimIris; j++) {

      double j_scaled = (double(j) - irisRadius) * scale + irisRadius;

      if (j_scaled < 0)

        continue;

      else if (j_scaled > double(dimIris - 1))

        break;

      double3* g_xyz_p = &glare_xyz[j * dimIris];

      for (int i = 0; i < dimIris; i++, g_xyz_p++) {

        double i_scaled = (double(i) - irisRadius) * scale + irisRadius;

        if (i_scaled < 0)

          continue;

        else if (i_scaled > double(dimIris - 1))

          break;

        double gl =

            lerpGlarePtn(i_scaled, j_scaled, glarePattern_p) * intensity_scale;

        g_xyz_p->x += gl * (double)cie_d65[ram] * (double)xyz[ram * 3 + 0];

        g_xyz_p->y += gl * (double)cie_d65[ram] * (double)xyz[ram * 3 + 1];

        g_xyz_p->z += gl * (double)cie_d65[ram] * (double)xyz[ram * 3 + 2];

      }

    }

  }

  glarePattern_ras->unlock();

  // convert to rgb

  double3* g_xyz_p = glare_xyz;

  double3* g_out_p = glare;

  double max_g     = 0.;

  double sum_g     = 0.;

  for (int i = 0; i < dimIris * dimIris; i++, g_xyz_p++, g_out_p++) {

    (*g_out_p).x = 3.240479 * (*g_xyz_p).x - 1.537150 * (*g_xyz_p).y -

                   0.498535 * (*g_xyz_p).z;

    (*g_out_p).y = -0.969256 * (*g_xyz_p).x + 1.875992 * (*g_xyz_p).y +

                   0.041556 * (*g_xyz_p).z;

    (*g_out_p).z = 0.055648 * (*g_xyz_p).x - 0.204043 * (*g_xyz_p).y +

                   1.057311 * (*g_xyz_p).z;

    // get the maximum and sum the green channel

    if ((*g_out_p).y > max_g) max_g = (*g_out_p).y;

    sum_g += (*g_out_p).y;

  }

  if (getFxVersion() >= 3) {

    double intensityFactor = std::exp(intensity);

    // normalize with the brightest green channel

    if (m_renderMode->getValue() == RenderMode_FilterPreview)

      intensityFactor /= max_g;

    // normalize with the sum of the intensity

    else

      intensityFactor /= sum_g;

    g_out_p = glare;

    for (int i = 0; i < dimIris * dimIris; i++, g_out_p++) {

      (*g_out_p).x *= intensityFactor;

      (*g_out_p).y *= intensityFactor;

      (*g_out_p).z *= intensityFactor;

    }

  }

  glare_xyz_ras->unlock();

}

//------------------------------------------------

void Iwa_GlareFx::distortGlarePattern(const double frame, const TAffine affine,

                                      double* glare, const int dimIris) {

  auto lerp = [](double val1, double val2, double ratio) {

    return val1 * (1.0 - ratio) + val2 * ratio;

  };

  auto lerpGlarePtn = [&](double i, double j, double* gp) {

    int iId[2], jId[2];

    double iRatio, jRatio;

    iId[0] = int(i);

    iId[1] = (iId[0] < dimIris - 1) ? iId[0] + 1 : iId[0];

    iRatio = i - double(iId[0]);

    jId[0] = int(j);

    jId[1] = (jId[0] < dimIris - 1) ? jId[0] + 1 : jId[0];

    jRatio = j - double(jId[0]);

    if (iRatio == 0.0 && jRatio == 0.0) return gp[jId[0] * dimIris + iId[0]];

    return lerp(lerp(gp[jId[0] * dimIris + iId[0]],

                     gp[jId[0] * dimIris + iId[1]], iRatio),

                lerp(gp[jId[1] * dimIris + iId[0]],

                     gp[jId[1] * dimIris + iId[1]], iRatio),

                jRatio);

  };

  double size         = m_noise_size->getValue(frame);

  double evolution    = m_noise_evolution->getValue(frame);

  int octave          = m_noise_octave->getValue();

  double noiseFactor  = m_noise_factor->getValue(frame);

  double offsetFactor = 0.005;

  TPointD offset =

      TScale(offsetFactor) * affine * m_noise_offset->getValue(frame);

  double theta = m_rotation->getValue(frame) * M_PI_180;

  double cos_t = std::cos(theta);

  double sin_t = std::sin(theta);

  QList<double> noise_intensity;</double>

  double intensity_sum = 0.0;

  double tmp_intensity = 1.0;

  for (int i = 0; i < octave; i++) {

    noise_intensity.append(tmp_intensity);

    intensity_sum += tmp_intensity;

    tmp_intensity *= 0.5;

  }

  for (double& n_i : noise_intensity) n_i /= intensity_sum;

  // raster for storing the result

  double* distortedPtn_p;

  TRasterGR8P distortedPtn_ras(dimIris * sizeof(double), dimIris);

  distortedPtn_p = (double*)distortedPtn_ras->getRawData();

  distortedPtn_ras->lock();

  double* dist_p = distortedPtn_p;

  for (int j = 0; j < dimIris; j++) {

    double v = double(j) - double(dimIris) / 2.0;

    for (int i = 0; i < dimIris; i++, dist_p++) {

      double u = double(i) - double(dimIris) / 2.0;

      // obtain the noise coordinate

      double2 noiseUV;

      double len             = std::sqrt(u * u + v * v) * size;

      noiseUV.x              = (len == 0.0) ? 0.0 : u / len;

      noiseUV.y              = (len == 0.0) ? 0.0 : v / len;

      double currentSize     = 1.0;

      double currentEvoScale = 1.0;

      double noiseVal        = 0.5;

      noiseUV.x += offset.x;

      noiseUV.y += offset.y;

      for (int oct = 0; oct < octave; oct++) {

        double2 currentNoiseUV = {noiseUV.x / currentSize,

                                  noiseUV.y / currentSize};

        noiseVal += noise_intensity[oct] *

                    SimplexNoise::noise(currentNoiseUV.x, currentNoiseUV.y,

                                        evolution * currentEvoScale);

        currentSize *= 0.5;

        currentEvoScale *= 2.0;

      }

      double scale = 1.0 / (1.0 + (noiseVal - 1) * noiseFactor);

      double rot_u = u * cos_t - v * sin_t;

      double rot_v = u * sin_t + v * cos_t;

      double distorted_i = rot_u * scale + double(dimIris) / 2.0;

      double distorted_j = rot_v * scale + double(dimIris) / 2.0;

      if (distorted_i < 0.0 || distorted_i >= double(dimIris - 1) ||

          distorted_j < 0.0 || distorted_j >= double(dimIris - 1))

        (*dist_p) = 0.0;

      else

        (*dist_p) = lerpGlarePtn(distorted_i, distorted_j, glare);

    }

  }

  dist_p       = distortedPtn_p;

  double* gl_p = glare;

  for (int i = 0; i < dimIris * dimIris; i++, dist_p++, gl_p++)

    (*gl_p) = (*dist_p);

  distortedPtn_ras->unlock();

}

//------------------------------------------------

template <typename pixel="" raster,="" typename=""></typename>

void Iwa_GlareFx::setFilterPreviewToResult(const RASTER ras, double3* glare,

                                           int dimIris, int2 margin) {

  auto clamp01 = [](double chan) {

    if (chan < 0.0) return 0.0;

    if (chan > 1.0) return 1.0;

    return chan;

  };

  bool doClamp = (ras->getPixelSize() != 16);

  int j        = margin.y;

  for (int out_j = 0; out_j < ras->getLy(); j++, out_j++) {

    if (j < 0)

      continue;

    else if (j >= dimIris)

      break;

    PIXEL* pix = ras->pixels(out_j);

    int i      = margin.x;

    for (int out_i = 0; out_i < ras->getLx(); i++, out_i++, pix++) {

      if (i < 0)

        continue;

      else if (i >= dimIris)

        break;

      double3 gl_p = glare[j * dimIris + i];

      if (doClamp) {

        pix->r = (typename PIXEL::Channel)(clamp01(gl_p.x) *

                                           double(PIXEL::maxChannelValue));

        pix->g = (typename PIXEL::Channel)(clamp01(gl_p.y) *

                                           double(PIXEL::maxChannelValue));

        pix->b = (typename PIXEL::Channel)(clamp01(gl_p.z) *

                                           double(PIXEL::maxChannelValue));

      } else {  // floating point case

        pix->r = (typename PIXEL::Channel)gl_p.x;

        pix->g = (typename PIXEL::Channel)gl_p.y;

        pix->b = (typename PIXEL::Channel)gl_p.z;

      }

      pix->m = PIXEL::maxChannelValue;

    }

  }

}

//------------------------------------------------

// put the source tile's brightness to fft buffer

template <typename pixel="" raster,="" typename=""></typename>

void Iwa_GlareFx::setSourceTileToBuffer(const RASTER ras, kiss_fft_cpx* buf) {

  kiss_fft_cpx* buf_p = buf;

  for (int j = 0; j < ras->getLy(); j++) {

    PIXEL* pix = ras->pixels(j);

    for (int i = 0; i < ras->getLx(); i++, pix++, buf_p++) {

      // Value = 0.3R 0.59G 0.11B

      (*buf_p).r = (double(pix->r) * 0.3 + double(pix->g) * 0.59 +

                    double(pix->b) * 0.11) /

                   double(PIXEL::maxChannelValue);

    }

  }

}

// put the source tile's brightness to fft buffer

template <typename pixel="" raster,="" typename=""></typename>

void Iwa_GlareFx::setSourceTileToBuffer(const RASTER ras, kiss_fft_cpx* buf,

                                        int channel) {

  kiss_fft_cpx* buf_p = buf;

  for (int j = 0; j < ras->getLy(); j++) {

    PIXEL* pix = ras->pixels(j);

    for (int i = 0; i < ras->getLx(); i++, pix++, buf_p++) {

      if (channel == 0)

        (*buf_p).r = float(pix->r) / float(PIXEL::maxChannelValue);

      else if (channel == 1)

        (*buf_p).r = float(pix->g) / float(PIXEL::maxChannelValue);

      else {  // if (channel == 2)

        (*buf_p).r = float(pix->b) / float(PIXEL::maxChannelValue);

      }

      (*buf_p).i = 0.f;

    }

  }

}

//------------------------------------------------

void Iwa_GlareFx::setGlarePatternToBuffer(const double3* glare,

                                          kiss_fft_cpx* buf, const int channel,

                                          const int dimIris,

                                          const TDimensionI& dimOut) {

  int margin_x = (dimOut.lx - dimIris) / 2;

  int margin_y = (dimOut.ly - dimIris) / 2;

  for (int j = margin_y; j < margin_y + dimIris; j++) {

    const double3* glare_p = &glare[(j - margin_y) * dimIris];

    kiss_fft_cpx* buf_p    = &buf[j * dimOut.lx + margin_x];

    for (int i = margin_x; i < margin_x + dimIris; i++, buf_p++, glare_p++) {

      (*buf_p).r = (channel == 0)   ? (*glare_p).x

                   : (channel == 1) ? (*glare_p).y

                                    : (*glare_p).z;

    }

  }

}

//------------------------------------------------

void Iwa_GlareFx::multiplyFilter(kiss_fft_cpx* glare,

                                 const kiss_fft_cpx* source, const int count) {