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how to get stencil buffer x,y dimensions?

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I posted this in the graphics section but maybe there is a specific way to do this in OpenGL... After writing to the stencil buffer, I would like to be able to find the dimensions of the area that was stenciled, such as the minimum and maximum x and y coordinates. Does anyone know a fast way to do this? The way I draw over the stenciled area currently is to render a texture the size of the entire screen in order to do the capping. This is very SLOW. I am using OpenGL with a GEForce4, if that matters at all. Thanks in advance!

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