void SBTopHat::SBTopHatImpl::fillXImage(ImageView<double> im,
double x0, double dx, int izero,
double y0, double dy, int jzero) const
{
dbg<<"SBTopHat fillXImage\n";
dbg<<"x = "<<x0<<" + i * "<<dx<<", izero = "<<izero<<std::endl;
dbg<<"y = "<<y0<<" + j * "<<dy<<", jzero = "<<jzero<<std::endl;
const int m = im.getNCol();
const int n = im.getNRow();
double* ptr = im.getData();
int skip = im.getNSkip();
assert(im.getStep() == 1);
// The columns to consider have -r0 <= y < r0
// given that y = y0 + j dy
double absdx = std::abs(dx);
double absdy = std::abs(dy);
int j1 = std::max(0, int(std::ceil(-_r0/absdy - y0/dy)));
int j2 = std::min(n, int(std::ceil(_r0/absdy - y0/dy)));
y0 += j1 * dy;
ptr += j1*im.getStride();
for (int j=j1; j<j2; ++j,y0+=dy,ptr+=skip) {
double ysq = y0*y0;
double xmax = std::sqrt(_r0sq - ysq);
// Set to _norm all pixels with -xmax <= x < xmax
// given that x = x0 + i dx.
int i1 = std::max(0, int(std::ceil(-xmax/absdx - x0/dx)));
int i2 = std::min(m, int(std::ceil(xmax/absdx - x0/dx)));
int i=0;
for (; i<i1; ++i) ++ptr;
for (; i<i2; ++i) *ptr++ = _norm;
for (; i<m; ++i) ++ptr;
}
}
void SBBox::SBBoxImpl::fillXImage(ImageView<double> im,
double x0, double dx, int izero,
double y0, double dy, int jzero) const
{
dbg<<"SBBox fillXImage\n";
dbg<<"x = "<<x0<<" + i * "<<dx<<", izero = "<<izero<<std::endl;
dbg<<"y = "<<y0<<" + j * "<<dy<<", jzero = "<<jzero<<std::endl;
const int m = im.getNCol();
const int n = im.getNRow();
double* ptr = im.getData();
int skip = im.getNSkip();
assert(im.getStep() == 1);
x0 /= dx;
double wo2 = _wo2 / std::abs(dx);
y0 /= dy;
double ho2 = _ho2 / std::abs(dy);
// Fill the interior with _norm:
// Fill pixels where:
// x0 + i >= -width/2
// x0 + i < width/2
// y0 + j >= -width/2
// y0 + j < width/2
int i1 = std::max(0, int(std::ceil(-wo2 - x0)));
int i2 = std::min(m, int(std::ceil(wo2 - x0)));
int j1 = std::max(0, int(std::ceil(-ho2 - y0)));
int j2 = std::min(n, int(std::ceil(ho2 - y0)));
ptr += im.getStride() * j1 + i1;
skip += m - (i2-i1);
for (int j=j1; j<j2; ++j,ptr+=skip) {
for (int i=i1;i<i2;++i)
*ptr++ = _norm;
}
}
