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domain.cpp
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// Authors: Unknown. Please, if you are the author of this file, or if you
// know who are the authors of this file, let us know, so we can give the
// adequate credits and/or get the adequate authorizations.
#include "domain.h"
#define DEBUG 0
void apply_zoom(float *input, float *out, float zoom, int order, int width, int height)
{
int nwidth = (int)( zoom * (float) width);
int nheight = (int)( zoom * (float) height);
float *coeffs;
float *ref;
float cx[12],cy[12],ak[13];
// Guoshen Yu, 2010.09.22, Windows versions
vector<float> input_vec, coeffs_vec, ref_vec;
input_vec = vector<float>(width*height);
coeffs_vec = vector<float>(width*height);
ref_vec = vector<float>(width*height);
for (int i = 0; i < width*height; i++)
input_vec[i] = input[i];
if (order!=0 && order!=1 && order!=-3 &&
order!=3 && order!=5 && order!=7 && order!=9 && order!=11)
{
printf("unrecognized interpolation order.\n");
exit(-1);
}
if (order>=3) {
coeffs = new float[width*height];
// Guoshen Yu, 2010.09.21, Windows version
//finvspline(input,order,coeffs,width,height);
finvspline(input_vec,order,coeffs_vec,width,height);
for (int i = 0; i < width*height; i++)
coeffs[i] = coeffs_vec[i];
ref = coeffs;
if (order>3) init_splinen(ak,order);
} else
{
coeffs = NULL;
ref = input;
}
int xi,yi;
float xp,yp;
float res;
int n1,n2;
float bg = 0.0f;
float p=-0.5;
for(int i=0; i < nwidth; i++)
for(int j=0; j < nheight; j++)
{
xp = (float) i / zoom;
yp = (float) j / zoom;
if (order == 0) {
xi = (int)floor((double)xp);
yi = (int)floor((double)yp);
if (xi<0 || xi>=width || yi<0 || yi>=height)
res = bg;
else res = input[yi*width+xi];
} else {
if (xp<0. || xp>=(float)width || yp<0. || yp>=(float)height) res=bg;
else {
xp -= 0.5; yp -= 0.5;
int xi = (int)floor((double)xp);
int yi = (int)floor((double)yp);
float ux = xp-(float)xi;
float uy = yp-(float)yi;
switch (order)
{
case 1: /* first order interpolation (bilinear) */
n2 = 1;
cx[0]=ux; cx[1]=1.-ux;
cy[0]=uy; cy[1]=1.-uy;
break;
case -3: /* third order interpolation (bicubic Keys' function) */
n2 = 2;
keys(cx,ux,p);
keys(cy,uy,p);
break;
case 3: /* spline of order 3 */
n2 = 2;
spline3(cx,ux);
spline3(cy,uy);
break;
default: /* spline of order >3 */
n2 = (1+order)/2;
splinen(cx,ux,ak,order);
splinen(cy,uy,ak,order);
break;
}
res = 0.; n1 = 1-n2;
if (xi+n1>=0 && xi+n2<width && yi+n1>=0 && yi+n2<height) {
int adr = yi*width+xi;
for (int dy=n1;dy<=n2;dy++)
for (int dx=n1;dx<=n2;dx++)
res += cy[n2-dy]*cx[n2-dx]*ref[adr+width*dy+dx];
} else
// Guoshen Yu, 2010.09.21, Windows
for (int i = 0; i < width*height; i++)
ref_vec[i] = ref[i];
for (int dy=n1;dy<=n2;dy++)
for (int dx=n1;dx<=n2;dx++)
// Guoshen Yu, 2010.09.21, Windows
// res += cy[n2-dy]*cx[n2-dx]*v(ref,xi+dx,yi+dy,bg,width,height);
res += cy[n2-dy]*cx[n2-dx]*v(ref_vec,xi+dx,yi+dy,bg,width,height);
}
}
out[j*nwidth+i] = res;
}
}