static gdouble
get_stamp_force (GeglChantO *o,
gdouble x,
gdouble y)
{
WarpPrivate *priv = (WarpPrivate*) o->chant_data;
gfloat radius;
if (!priv->lookup)
{
calc_lut (o);
}
radius = sqrt(x*x+y*y);
if (radius < 0.5 * o->size + 1)
{
/* linear interpolation */
gdouble a, ratio;
gdouble before, after;
a = floor (radius);
ratio = (radius - a);
before = priv->lookup[(gint) a];
after = priv->lookup[(gint) a + 1];
return ratio * before + (1.0 - ratio) * after;
}
return 0.0;
}
static gdouble
get_stamp_force (GeglProperties *o,
gdouble x,
gdouble y)
{
WarpPrivate *priv = (WarpPrivate*) o->user_data;
gfloat radius;
if (!priv->lookup)
{
calc_lut (o);
}
radius = sqrt(x*x+y*y);
if (radius < 0.5 * o->size + 1)
{
/* linear interpolation */
gint a;
gdouble ratio;
gdouble before, after;
a = (gint)(radius);
ratio = (radius - a);
before = priv->lookup[a];
after = priv->lookup[a + 1];
return (1.0 - ratio) * before + ratio * after;
}
return 0.0;
}