/* function assumes out to be zero'ed, only does RGBA */
if(node->custom1==0){
void bilinear_interpolation(struct ImBuf *in, struct ImBuf *out, float u, float v, int xout, int yout);
}
else if(node->custom1==1){
void neareast_interpolation(struct ImBuf *in, struct ImBuf *out, float u, float v, int xout, int yout);
}
else{
void bicubic_interpolation(struct ImBuf *in, struct ImBuf *out, float x, float y, int xout, int yout);
}