#include "traster.h"

#include "tpixelutils.h"

#include "trop.h"

//***********************************************************************************************

//    Local namespace stuff

//***********************************************************************************************

namespace {

template <typename t=""></typename>

struct RaylitFuncTraits {

  typedef void (*function_type)(T *, T *, int, int, int, int, const TRect &,

                                const TRect &, const TRop::RaylitParams &);

};

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

template <typename t=""></typename>

void performStandardRaylit(T *bufIn, T *bufOut, int dxIn, int dyIn, int dxOut,

                           int dyOut, const TRect &srcRect,

                           const TRect &dstRect,

                           const TRop::RaylitParams ¶ms) {

  /* NOTATION:  Diagram assuming octant 1

  /                   |

 /                    |

/  - ray_final_y      | octLy

/ 1                    |

+----                   |

_____  octLx

So, octLx and octLy are the octant's lx and ly;  ray_final_y is the final height

of the ray we're tracing

*/

  // Build colors-related variables

  int max = T::maxChannelValue;

  /*-- 透明部分の色 --*/

  int transp_val = (params.m_invert) ? max : 0, opaque_val = max - transp_val;

  int value, val_r, val_g, val_b, val_m;

  double lightness, r_fac, g_fac, b_fac, m_fac;

  /*-- 8bit/16bitの違いを吸収する係数 --*/

  double factor = max / 255.0;

  double scale =

      params.m_scale;  // NOTE: These variable initializations are, well,

  double decay = log(params.m_decay / 100.0 + 1.0) +

                 1.0;  // heuristic at least. They were probably tested

  double intensity =

      1e8 * log(params.m_intensity / 100.0 + 1.0) /

      scale;  // to be good, but didn't quite make any REAL sense.

  double smoothness = log(params.m_smoothness * 5.0 / 100.0 + 1.0);  //

  // They could be done MUCH better, but changing them

  /*-- 1ステップ進んだ時、次のピクセルで光源が無かったときの光の弱まる割合 --*/

  double neg_delta_p =

      smoothness *

      intensity;  // would alter the way raylit has been applied until now.

  /*-- 1ステップ進んだ時、次のピクセルで光源が有ったときの光の強まる割合 --*/

  double quot_delta_p = intensity / max;  //

  // Should be changed at some point, though...

  /*--

   * m_colorはRaylitFxのColor値。r_fac、g_fac、b_facは各チャンネルをPremultiplyした値

   * --*/

  m_fac = (params.m_color.m / 255.0);

  r_fac = m_fac * (params.m_color.r / 255.0);

  g_fac = m_fac * (params.m_color.g / 255.0);

  b_fac = m_fac * (params.m_color.b / 255.0);

  // Geometry-related variables

  int x, y, ray_final_y;

  int octLx = dstRect.x1 - dstRect.x0;

  double rayPosIncrementX = 1.0 / scale;

  double sq_z = sq(params.m_lightOriginSrc.z);  // We'll be making square

                                                // distances from p, so square

                                                // it once now

  // Perform raylit

  T *pixIn, *pixOut;

  for (ray_final_y = 0; ray_final_y < octLx; ++ray_final_y) {

    // Initialize increment variables

    lightness = 0.0;

    double rayPosIncrementY = rayPosIncrementX * (ray_final_y / (double)octLx);

    // Use an integer counter to know when y must increase. Will add ray_final_y

    // as long as

    // a multiple of octLx-1 is reached, then increase

    int yIncrementCounter = 0, yIncrementThreshold = octLx - 1;

    // Trace a single ray of light

    TPointD rayPos(rayPosIncrementX, rayPosIncrementY);

    for (x = dstRect.x0, y = dstRect.y0, pixIn = bufIn, pixOut = bufOut;

         (x < dstRect.x1) && (y < dstRect.y1); ++x) {

      bool insideSrc = (x >= srcRect.x0) && (x < srcRect.x1) &&

                       (y >= srcRect.y0) && (y < srcRect.y1);

      if (insideSrc) {

        // Add a light component depending on source's matte

        if (pixIn->m == opaque_val)

          lightness = std::max(

              0.0, lightness - neg_delta_p);  // No light source - ray fading

        else {

          if (pixIn->m == transp_val)

            lightness += intensity;  // Full light source - ray enforcing

          else

            lightness = std::max(

                0.0, lightness +  // Half light source

                         (params.m_invert ? pixIn->m : (max - pixIn->m)) *

                             quot_delta_p);  //   matte-linear enforcing

        }

        if (params.m_includeInput) {

          val_r = pixIn->r;

          val_g = pixIn->g;

          val_b = pixIn->b;

          val_m = pixIn->m;

        } else

          val_r = val_g = val_b = val_m = 0;

      } else {

        if (!params.m_invert)

          lightness += intensity;

        else

          lightness = std::max(0.0, lightness - neg_delta_p);

        val_r = val_g = val_b = val_m = 0;

      }

      bool insideDst = (x >= 0) && (y >= 0);

      if (insideDst) {

        // Write the corresponding destination pixel

        if (lightness > 0.0)

          value = (int)(factor * lightness /

                            (rayPos.x *

                             pow((double)(sq(rayPos.x) + sq(rayPos.y) + sq_z),

                                 decay)) +

                        0.5);  // * ^-d...  0.5 rounds

        else

          value = 0;

        // NOTE: pow() could be slow. If that is the case, it could be cached

        // for the whole octant along the longest ray at integer positions,

        // and then linearly interpolated between those... Have to profile this

        // before resorting to that...

        val_r += value * r_fac;

        val_g += value * g_fac;

        val_b += value * b_fac;

        val_m += value * m_fac;

        pixOut->r = (val_r > max) ? max : val_r;

        pixOut->g = (val_g > max) ? max : val_g;

        pixOut->b = (val_b > max) ? max : val_b;

        pixOut->m = (val_m > max) ? max : val_m;

      }

      // Increment variables along the x-axis

      pixIn += dxIn, pixOut += dxOut;

      rayPos.x += rayPosIncrementX, rayPos.y += rayPosIncrementY;

      // Increment variables along the y-axis

      if ((yIncrementCounter += ray_final_y) >= yIncrementThreshold) {

        ++y, pixIn += dyIn, pixOut += dyOut;

        yIncrementCounter -= yIncrementThreshold;

      }

    }

  }

}

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

template <typename t=""></typename>

void performColorRaylit(T *bufIn, T *bufOut, int dxIn, int dyIn, int dxOut,

                        int dyOut, const TRect &srcRect, const TRect &dstRect,

                        const TRop::RaylitParams ¶ms) {

  // Build colors-related variables

  int max = T::maxChannelValue;

  int val_r, val_g, val_b, val_m;

  double lightness_r, lightness_g, lightness_b;

  double factor = max / 255.0;

  double scale =

      params.m_scale;  // NOTE: These variable initializations are, well,

  double decay = log(params.m_decay / 100.0 + 1.0) +

                 1.0;  // heuristic at least. They were probably tested

  double intensity =

      1e8 * log(params.m_intensity / 100.0 + 1.0) /

      scale;  // to be good, but didn't quite make any REAL sense.

  double smoothness = log(params.m_smoothness * 5.0 / 100.0 + 1.0);  //

  // They could be done MUCH better, but changing them

  double neg_delta_p =

      smoothness *

      intensity;  // would alter the way raylit has been applied until now.

  double quot_delta_p = intensity / max;  //

  // Should be changed at some point, though...

  // Geometry-related variables

  int x, y, ray_final_y;

  int octLx = dstRect.x1 - dstRect.x0;

  double rayPosIncrementX = 1.0 / scale;

  double fac, sq_z = sq(params.m_lightOriginSrc.z);  // We'll be making square

                                                     // distances from p, so

                                                     // square it once now

  // Perform raylit

  T *pixIn, *pixOut;

  for (ray_final_y = 0; ray_final_y < octLx; ++ray_final_y) {

    // Initialize increment variables

    lightness_r = lightness_g = lightness_b = 0.0;

    int l, l_max;

    double rayPosIncrementY = rayPosIncrementX * (ray_final_y / (double)octLx);

    // Use an integer counter to know when y must increase. Will add ray_final_y

    // as long as

    // a multiple of octLx-1 is reached, then increase

    int yIncrementCounter = 0, yIncrementThreshold = octLx - 1;

    // Trace a single ray of light

    TPointD rayPos(rayPosIncrementX, rayPosIncrementY);

    for (x = dstRect.x0, y = dstRect.y0, pixIn = bufIn, pixOut = bufOut;

         (x < dstRect.x1) && (y < dstRect.y1); ++x) {

      bool insideSrc = (x >= srcRect.x0) && (x < srcRect.x1) &&

                       (y >= srcRect.y0) && (y < srcRect.y1);

      if (insideSrc) {

        val_r = pixIn->r;

        val_g = pixIn->g;

        val_b = pixIn->b;

        val_m = pixIn->m;

        lightness_r = std::max(0.0, val_r ? lightness_r + val_r * quot_delta_p

                                          : lightness_r - neg_delta_p);

        lightness_g = std::max(0.0, val_g ? lightness_g + val_g * quot_delta_p

                                          : lightness_g - neg_delta_p);

        lightness_b = std::max(0.0, val_b ? lightness_b + val_b * quot_delta_p

                                          : lightness_b - neg_delta_p);

        if (!params.m_includeInput) val_r = val_g = val_b = val_m = 0;

      } else {

        lightness_r = std::max(0.0, lightness_r - neg_delta_p);

        lightness_g = std::max(0.0, lightness_g - neg_delta_p);

        lightness_b = std::max(0.0, lightness_b - neg_delta_p);

        val_r = val_g = val_b = val_m = 0;

      }

      bool insideDst = (x >= 0) && (y >= 0);

      if (insideDst) {

        // Write the corresponding destination pixel

        fac =

            factor / (rayPos.x *

                      pow((double)(sq(rayPos.x) + sq(rayPos.y) + sq_z), decay));

        // NOTE: pow() could be slow. If that is the case, it could be cached

        // for the whole octant along the longest ray at integer positions,

        // and then linearly interpolated between those... Have to profile this

        // before resorting to that...

        val_r += l = (int)(fac * lightness_r + 0.5);

        l_max      = l;

        val_g += l = (int)(fac * lightness_g + 0.5);

        l_max      = std::max(l, l_max);

        val_b += l = (int)(fac * lightness_b + 0.5);

        l_max      = std::max(l, l_max);

        val_m += l_max;

        pixOut->r = (val_r > max) ? max : val_r;

        pixOut->g = (val_g > max) ? max : val_g;

        pixOut->b = (val_b > max) ? max : val_b;

        pixOut->m = (val_m > max) ? max : val_m;

      }

      // Increment variables along the x-axis

      pixIn += dxIn, pixOut += dxOut;

      rayPos.x += rayPosIncrementX, rayPos.y += rayPosIncrementY;

      // Increment variables along the y-axis

      if ((yIncrementCounter += ray_final_y) >= yIncrementThreshold) {

        ++y, pixIn += dyIn, pixOut += dyOut;

        yIncrementCounter -= yIncrementThreshold;

      }

    }

  }

}

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

/*-- ピザ状に8分割された領域の1つを計算する --*/

template <typename t=""></typename>

void computeOctant(const TRasterPT<t> &src, const TRasterPT<t> &dst, int octant,</t></t>

                   const TRop::RaylitParams ¶ms,

                   typename RaylitFuncTraits<t>::function_type raylitFunc) {</t>

  // Build octant geometry variables

  int x0, x1, lxIn, lxOut, dxIn, dxOut;

  int y0, y1, lyIn, lyOut, dyIn, dyOut;

  const T3DPoint &pIn  = params.m_lightOriginSrc,

                 &pOut = params.m_lightOriginDst;

  int srcWrap = src->getWrap(), dstWrap = dst->getWrap();

  T *bufIn = (T *)src->getRawData() + tfloor(pIn.y) * srcWrap + tfloor(pIn.x);

  T *bufOut =

      (T *)dst->getRawData() + tfloor(pOut.y) * dstWrap + tfloor(pOut.x);

  TRect srcRect(src->getBounds() +

                TPoint(tround(pOut.x - pIn.x), tround(pOut.y - pIn.y)));

  lxIn = src->getLx(), lxOut = dst->getLx();

  lyIn = src->getLy(), lyOut = dst->getLy();

  /*-- 1ピクセルずつ進むときの移動値 --*/

  // Vertical octant pairs

  if (octant == 1 || octant == 8)

    dxIn = 1, dxOut = 1, x0 = tfloor(pOut.x), x1 = lxOut;

  if (octant == 2 || octant == 7)

    dyIn = 1, dyOut = 1, y0 = tfloor(pOut.x), y1 = lxOut;

  if (octant == 3 || octant == 6)

    dyIn = -1, dyOut = -1, y0 = lxOut - tfloor(pOut.x) - 1, y1 = lxOut,

    std::swap(srcRect.x0, srcRect.x1), srcRect.x0 = lxOut - srcRect.x0,

    srcRect.x1 = lxOut - srcRect.x1;

  if (octant == 4 || octant == 5)

    dxIn = -1, dxOut = -1, x0 = lxOut - tfloor(pOut.x) - 1, x1 = lxOut,

    std::swap(srcRect.x0, srcRect.x1), srcRect.x0 = lxOut - srcRect.x0,

    srcRect.x1 = lxOut - srcRect.x1;

  // Horizontal octant pairs

  if (octant == 2 || octant == 3)

    dxIn = srcWrap, dxOut = dstWrap, x0 = tfloor(pOut.y), x1 = lyOut;

  if (octant == 1 || octant == 4)

    dyIn = srcWrap, dyOut = dstWrap, y0 = tfloor(pOut.y), y1 = lyOut;

  if (octant == 5 || octant == 8)

    dyIn = -srcWrap, dyOut = -dstWrap, y0 = lyOut - tfloor(pOut.y) - 1,

    y1 = lyOut, std::swap(srcRect.y0, srcRect.y1), srcRect.y0 = lyOut - srcRect.y0,

    srcRect.y1 = lyOut - srcRect.y1;

  if (octant == 6 || octant == 7)

    dxIn = -srcWrap, dxOut = -dstWrap, x0 = lyOut - tfloor(pOut.y) - 1,

    x1 = lyOut, std::swap(srcRect.y0, srcRect.y1), srcRect.y0 = lyOut - srcRect.y0,

    srcRect.y1 = lyOut - srcRect.y1;

  /*-- 縦向きのピザ領域を計算する場合は、90度回転してから --*/

  // Swap x and y axis where necessary

  if (octant == 2 || octant == 3 || octant == 6 || octant == 7) {

    std::swap(lxIn, lyIn), std::swap(lxOut, lyOut);

    std::swap(srcRect.x0, srcRect.y0), std::swap(srcRect.x1, srcRect.y1);

  }

  int octLx = (x1 - x0), octLy = (y1 - y0);

  assert(octLx > 0 && octLy > 0);

  if (octLx <= 0 && octLy <= 0) return;

  raylitFunc(bufIn, bufOut, dxIn, dyIn, dxOut, dyOut, srcRect,

             TRect(x0, y0, x1, y1), params);

}

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

/*

  OCTANTS:

    \ 3 | 2 /

     \  |  /

      \ | /

     4 \|/ 1

    ----+----

     5 /|\ 8

      / | \

     /  |  \

    / 6 | 7 \

*/

template <typename t=""></typename>

void doRaylit(const TRasterPT<t> &src, const TRasterPT<t> &dst,</t></t>

              const TRop::RaylitParams ¶ms,

              typename RaylitFuncTraits<t>::function_type raylitFunc) {</t>

  int lxOut = dst->getLx(), lyOut = dst->getLy();

  const T3DPoint &p = params.m_lightOriginDst;

  src->lock();

  dst->lock();

  // Depending on the position of p, only some of the quadrants need to be built

  if (p.y < lyOut) {

    if (p.x < lxOut) {

      // Compute the raylit fx on each octant independently

      computeOctant(src, dst, 1, params, raylitFunc);

      computeOctant(src, dst, 2, params, raylitFunc);

    }

    if (p.x >= 0) {

      computeOctant(src, dst, 3, params, raylitFunc);

      computeOctant(src, dst, 4, params, raylitFunc);

    }

  }

  if (p.y >= 0) {

    if (p.x >= 0) {

      computeOctant(src, dst, 5, params, raylitFunc);

      computeOctant(src, dst, 6, params, raylitFunc);

    }

    if (p.x < lxOut) {

      computeOctant(src, dst, 7, params, raylitFunc);

      computeOctant(src, dst, 8, params, raylitFunc);

    }

  }

  dst->unlock();

  src->unlock();

}

}  // namespace

//***********************************************************************************************

//    TRop::raylit implementation

//***********************************************************************************************

void TRop::raylit(const TRasterP &dstRas, const TRasterP &srcRas,

                  const RaylitParams ¶ms) {

  if ((TRaster32P)dstRas && (TRaster32P)srcRas)

    doRaylit<tpixel32>(srcRas, dstRas, params,</tpixel32>

                       &performStandardRaylit<tpixel32>);</tpixel32>

  else if ((TRaster64P)dstRas && (TRaster64P)srcRas)

    doRaylit<tpixel64>(srcRas, dstRas, params,</tpixel64>

                       &performStandardRaylit<tpixel64>);</tpixel64>

  else

    throw TException("TRop::raylit unsupported pixel type");

}

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

void TRop::glassRaylit(const TRasterP &dstRas, const TRasterP &srcRas,

                       const RaylitParams ¶ms) {

  if ((TRaster32P)dstRas && (TRaster32P)srcRas)

    doRaylit<tpixel32>(srcRas, dstRas, params, &performColorRaylit<tpixel32>);</tpixel32></tpixel32>

  else if ((TRaster64P)dstRas && (TRaster64P)srcRas)

    doRaylit<tpixel64>(srcRas, dstRas, params, &performColorRaylit<tpixel64>);</tpixel64></tpixel64>

  else

    throw TException("TRop::raylit unsupported pixel type");

}