Output resolution causes picture to be very blurry

[GoogleCodeExporter]

Here is something that definitely seems to be related to the screen resolution 
(internal or output one). 

By default, final burn outputs to the current console or maximum screen 
resolution (for instance 1280*1024 for a 4/3 screen). For some reason, the 
result is especially blurry, which seems to be less the case for emulator 
choosing a different resolution like 640*480 or 800x600.

Would it be possible to :

- optionally chose the ouput resolution ? Which may differ to the internal 
rendering resolution. I guess an overlay is used, which may explain the 
result...

- optionally ask the emulator to use a multiple of the original system 
resolution which should result in a sharper result ?

For instance, if a 640x480 mode could be used to display a 320*240 as it's 
exactly a quarter of the resolution.

For, most likely, a similar reason, without bilinear filtering, picture is 
distorted -- some lines do not always take the same space on the actual screen 
due to extrapolation I guess. Could it be worked-around by applying a 
combination of the two suggestions above ?

Thanks again to devs for the great work !
Best regards.

Original issue reported on code.google.com by tal...@gmail.com on 13 Oct 2013 at 1:23