read a bitmap from a file, relative coordinate scale + display coordinate system
#include <tscope5.h>
#include <stdio.h>
int main()
{
double dw, dh;
printf("display size: %f %f\n", dw, dh);
double bw, bh;
printf("bitmap size: %f %f\n", bw, bh);
return 0;
}