How to make cairo_scale work?

        cairo_set_source_rgba(cr, 1.0, 1.0, 0.0, 1);
        cairo_rectangle(cr, 150, 150, 300, 300);
        cairo_fill(cr);

        cairo_scale(cr, 2, 2);
        How can make above work? I know cairo_scale() should be called before  cairo_rectangle(). Anyone help? cairo_rotate() is also like this.

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