Do you mean you want to draw 100 x 100 to fit iPhone 5?
Use 100 x 56 windows size, it can fit the entire screen according to http://andrew.hedges.name/experiments/aspect_ratio/ but you need to study the results between original sprites and big sprites.
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Yes exactly!!! Someone who understands! ^_^
Oh btw the link u sent isnt working >.<
http://andrew.hedges.name/experiments/aspect_ratio/
This forum is horrible and buggy, sometimes all links leave %20 at last.