Newer drivers either don't follow this paradigm or don't support the arithmetic stretching at all. Most drivers provided automatic ARITHMETIC_X stretching in this case.
In the original specification, there was no mention about how to handle the X axis stretching. There is this weird grey area in the Dx7 specification that talks about ARITHMETIC stretching along the Y axis. The newer drivers for newer cards emulate Dx7 using Dx9 (and Dx10).
If the ratio is not 4:3 then the framework uses the desktop resolution and stretches the screen (during the final blit from Back to front).
In order to maintain an aspect ratio (widescreen aware), Sexy 1.33 checks the desktop aspect ratio.
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