Is there any Fastest Algorithms to genearte Square, Circle...

Hi Guys,
I'm doing a Graphics Program in DOS using Turbo C++ and Borland C++. I'm using the user definded VGA Driver graphics Mode. So I'll be unable to use the graphics.h file's Libraries. Is there any libraries available for generating Square, Rectangle, Circle, Lines, etc., (They should be the Faster like the one in graphics.h Library or equivalent). I'll have only method the PutPixel. I should use it to draw these figures. Any Idea. Please help. It's really urgent. Thnx in Advance.