[SDL] Does SDL clip surfaces on blitting?

[Jonathan Greig]

Yes, it does only display the size of your "screen" as James said. I am a
bit interested in this myself from a performance standpoint, as a bit of
code I have written in the past loads a large image into a surface. Does SDL
spend time clipping the pixel data before blitting? I.E. is the unused
portion of the image actually causing any performance impact as opposed to
clipping the image manually before blitting?
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