int main(int argc, char **argv) {
int n = 2;
double f[4] = { 0.0, 1.0, 2.0, 3.0 };
double x[2] = { atof(argv[1]), atof(argv[2]) };
double result;
result = lerp(n, x, f);
printf("Result is: %f\n", result);
result = lerp2(x[0], x[1], f);
printf("Result is: %f\n", result);
return 0;
}
static int img_linear(img *p, const double *v, float *c)
{
double s = v[0] - 0.5;
double t = v[1] - 0.5;
const int ia = (int) floor(s);
const int ib = (int) ceil(s);
const int ja = (int) floor(t);
const int jb = (int) ceil(t);
float aa[4], ab[4];
float ba[4], bb[4];
int daa = img_pixel(p, ia, ja, aa);
int dab = img_pixel(p, ia, jb, ab);
int dba = img_pixel(p, ib, ja, ba);
int dbb = img_pixel(p, ib, jb, bb);
if (daa && dab && dba && dbb)
{
const float u = (float) (s - floor(s));
const float v = (float) (t - floor(t));
switch (p->c)
{
case 4: c[3] = lerp2(aa[3], ab[3], ba[3], bb[3], u, v);
case 3: c[2] = lerp2(aa[2], ab[2], ba[2], bb[2], u, v);
case 2: c[1] = lerp2(aa[1], ab[1], ba[1], bb[1], u, v);
case 1: c[0] = lerp2(aa[0], ab[0], ba[0], bb[0], u, v);
}
}
else if (daa)
{
switch (p->c)
{
case 4: c[3] = aa[3];
case 3: c[2] = aa[2];
case 2: c[1] = aa[1];
case 1: c[0] = aa[0];
}
}
else if (dab)
{
switch (p->c)
{
case 4: c[3] = ab[3];
case 3: c[2] = ab[2];
case 2: c[1] = ab[1];
case 1: c[0] = ab[0];
}
}
else if (dba)
{
switch (p->c)
{
case 4: c[3] = ba[3];
case 3: c[2] = ba[2];
case 2: c[1] = ba[1];
case 1: c[0] = ba[0];
}
}
else if (dbb)
{
switch (p->c)
{
case 4: c[3] = bb[3];
case 3: c[2] = bb[2];
case 2: c[1] = bb[1];
case 1: c[0] = bb[0];
}
}
return (daa || dab || dba || dbb) ? 1 : 0;
}