/usr/include/libwildmagic/Wm5FastBlur.inl is in libwildmagic-dev 5.13-1ubuntu1.
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// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
//----------------------------------------------------------------------------
template <typename Numeric>
void FastBlur1 (int xBound, Numeric* image, Numeric* temp, double scale,
double logBase)
{
int x;
for (x = 0; x < xBound; ++x)
{
double rxp = x + scale;
double rxm = x - scale;
int xp = (int)Mathd::Floor(rxp);
int xm = (int)Mathd::Ceil(rxm);
double xsum = -2.0*image[x];
if (xp >= xBound-1) // use boundary value
{
xsum += image[xBound-1];
}
else // linearly interpolate
{
xsum += image[xp] + (rxp - xp)*(image[xp+1] - image[xp]);
}
if (xm <= 0) // use boundary value
{
xsum += image[0];
}
else // linearly interpolate
{
xsum += image[xm] + (rxm - xm)*(image[xm] - image[xm-1]);
}
temp[x] = (Numeric)(image[x] + logBase*xsum);
}
for (x = 0; x < xBound; ++x)
{
image[x] = temp[x];
}
}
//----------------------------------------------------------------------------
template <typename Numeric>
void FastBlur2 (int xBound, int yBound, Numeric** image, Numeric** temp,
double scale, double logBase)
{
int x, y;
for (y = 0; y < yBound; ++y)
{
double ryp = y + scale;
double rym = y - scale;
int yp = (int)Mathd::Floor(ryp);
int ym = (int)Mathd::Ceil(rym);
for (x = 0; x < xBound; ++x)
{
double rxp = x + scale;
double rxm = x - scale;
int xp = (int)Mathd::Floor(rxp);
int xm = (int)Mathd::Ceil(rxm);
// x portion of second central difference
double xsum = -2.0*image[y][x];
if (xp >= xBound-1) // use boundary value
{
xsum += image[y][xBound-1];
}
else // linearly interpolate
{
xsum += image[y][xp] + (rxp - xp)*(image[y][xp+1] -
image[y][xp]);
}
if (xm <= 0) // use boundary value
{
xsum += image[y][0];
}
else // linearly interpolate
{
xsum += image[y][xm] + (rxm - xm)*(image[y][xm] -
image[y][xm-1]);
}
// y portion of second central difference
double ysum = -2.0*image[y][x];
if (yp >= yBound-1) // use boundary value
{
ysum += image[yBound-1][x];
}
else // linearly interpolate
{
ysum += image[yp][x] + (ryp - yp)*(image[yp+1][x] -
image[yp][x]);
}
if (ym <= 0) // use boundary value
{
ysum += image[0][x];
}
else // linearly interpolate
{
ysum += image[ym][x] + (rym - ym)*(image[ym][x] -
image[ym-1][x]);
}
temp[y][x] = (Numeric)(image[y][x] + logBase*(xsum + ysum));
}
}
for (y = 0; y < yBound; ++y)
{
for (x = 0; x < xBound; ++x)
{
image[y][x] = temp[y][x];
}
}
}
//----------------------------------------------------------------------------
template <typename Numeric>
void FastBlur3 (int xBound, int yBound, int zBound, Numeric*** image,
Numeric*** temp, double scale, double logBase)
{
int x, y, z;
for (z = 0; z < zBound; ++z)
{
double rzp = z + scale;
double rzm = z - scale;
int zp = (int)Mathd::Floor(rzp);
int zm = (int)Mathd::Ceil(rzm);
for (y = 0; y < yBound; ++y)
{
double ryp = y + scale;
double rym = y - scale;
int yp = (int)Mathd::Floor(ryp);
int ym = (int)Mathd::Ceil(rym);
for (x = 0; x < xBound; ++x)
{
double rxp = x + scale;
double rxm = x - scale;
int xp = (int)Mathd::Floor(rxp);
int xm = (int)Mathd::Ceil(rxm);
// x portion of second central difference
double xsum = -2.0*image[z][y][x];
if (xp >= xBound-1) // use boundary value
{
xsum += image[z][y][xBound-1];
}
else // linearly interpolate
{
xsum += image[z][y][xp] + (rxp - xp)*(
image[z][y][xp+1] - image[z][y][xp]);
}
if (xm <= 0) // use boundary value
{
xsum += image[z][y][0];
}
else // linearly interpolate
{
xsum += image[z][y][xm] + (rxm - xm)*(
image[z][y][xm] - image[z][y][xm-1]);
}
// y portion of second central difference
double ysum = -2.0*image[z][y][x];
if (yp >= yBound-1) // use boundary value
{
ysum += image[z][yBound-1][x];
}
else // linearly interpolate
{
ysum += image[z][yp][x] + (ryp-yp)*(
image[z][yp+1][x] - image[z][yp][x]);
}
if (ym <= 0) // use boundary value
{
ysum += image[z][0][x];
}
else // linearly interpolate
{
ysum += image[z][ym][x] + (rym - ym)*(
image[z][ym][x] - image[z][ym-1][x]);
}
// z portion of second central difference
double zsum = -2.0*image[z][y][x];
if (zp >= zBound-1) // use boundary value
{
zsum += image[zBound-1][y][x];
}
else // linearly interpolate
{
zsum += image[zp][y][x] + (rzp - zp)*(
image[zp+1][y][x] - image[zp][y][x]);
}
if (zm <= 0) // use boundary value
{
zsum += image[0][y][x];
}
else // linearly interpolate
{
zsum += image[zm][y][x] + (rzm - zm)*(
image[zm][y][x] - image[zm-1][y][x]);
}
temp[z][y][x] = (Numeric)(image[z][y][x] +
logBase*(xsum + ysum + zsum));
}
}
}
for (z = 0; z < zBound; ++z)
{
for (y = 0; y < yBound; ++y)
{
for (x = 0; x < xBound; ++x)
{
image[z][y][x] = temp[z][y][x];
}
}
}
}
//----------------------------------------------------------------------------
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