void regress_foo_rectangle_add RegressFooRectangle* r1 const RegressFooRectangle* r2 regress_foo_rectangle_add void regress_foo_rectangle_add (RegressFooRectangle* r1, const RegressFooRectangle* r2); <code>r1</code>

add to this rect

 <code>r2</code>

source rectangle

 <code>Returns</code>