#include "trop.h"

#include "tpixelutils.h"

#define FLOOR(x) ((int)(x) > (x) ? (int)(x)-1 : (int)(x))

/*

inline bool isInFirstColor(const TDimensionD &dim,int x, int y,const TPointD

&offset)

{

  int lx=dim.lx;

  int ly=dim.ly;

  int offX,offY;

  offX = offset.x>=0 ? (int)offset.x : (int)(lx-offset.x);

  offY = offset.y>=0 ? (int)offset.y : (int)(ly-offset.y);

  if ((( ((int)(offX+x))/lx + ((int)(offY+y))/ly )%2 ) == 0)

    return false;

  return true;

}

*/

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

namespace {

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

void do_checkBoard(TRasterPT<pixel> rout, const PIXEL &pix1, const PIXEL &pix2,</pixel>

                   const TDimensionD &dim, const TPointD &offset) {

  assert(dim.lx > 0);

  assert(dim.ly > 0);

  double freqX = 0.5 / dim.lx;

  double freqY = 0.5 / dim.ly;

  double phaseX = 0;

  if (offset.x >= 0) {

    double q = offset.x * freqX;

    phaseX   = (q - floor(q));

  } else {

    double q = (-offset.x * freqX);

    phaseX   = 1.0 - (q - floor(q));

  }

  double phaseY = 0;

  if (offset.y >= 0) {

    double q = offset.y * freqY;

    phaseY   = (q - floor(q));

  } else {

    double q = (-offset.y * freqY);

    phaseY   = 1.0 - (q - floor(q));

  }

  int lx = rout->getLx();

  int ly = rout->getLy();

  for (int y = 0; y < ly; y++) {

    double yy = 2.0 * (phaseY + y * freqY);

    int iy    = FLOOR(yy);

    assert(iy == (int)floor(yy));

    rout->lock();

    PIXEL *pix = rout->pixels(y);

    for (int x = 0; x < lx; x++) {

      double xx = 2.0 * (phaseX + x * freqX);

      int ix    = FLOOR(xx);

      assert(ix == (int)floor(xx));

      if ((ix ^ iy) & 1)

        *pix++ = pix1;

      else

        *pix++ = pix2;

    }

    rout->unlock();

  }

}

}  // namespace

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

void TRop::checkBoard(TRasterP rout, const TPixel32 &pix1, const TPixel32 &pix2,

                      const TDimensionD &dim, const TPointD &offset) {

  // assert(offset.x<=dim.lx && offset.y<=dim.ly);

  TRaster32P rout32 = rout;

  if (rout32)

    do_checkBoard<tpixel32>(rout32, pix1, pix2, dim, offset);</tpixel32>

  else {

    TRaster64P rout64 = rout;

    if (rout64)

      do_checkBoard<tpixel64>(rout64, toPixel64(pix1), toPixel64(pix2), dim,</tpixel64>

                              offset);

    else

      throw TRopException("unsupported pixel type");

  }

}