if (horizontal_counter >= 300 ) and (horizontal_counter < 364 ) and (vertical_counter >= 300 ) and (vertical_counter < 332 )
then


        green_out <= screen(a)(b);


    if a<63 then
        a<=a+1;
    elsif b<31 then
        b<=b+1;
        a<=0;
    else
        a<=0;
        b<=0;
    end if;

else
    green_out <= '0';
end if;