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Bug 2328

Summary: HiDPI support on Windows is broken
Product: SDL Reporter: BurnSpamAddress
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED DUPLICATE QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: icculus
Version: HG 2.1   
Hardware: x86_64   
OS: Windows 7   

Description BurnSpamAddress 2013-12-24 17:22:56 UTC 
HiDPI support on Windows does not follow the DPI scaling guidelines from MSDN [1]

To reproduce:
 - set DPI scaling on Windows to 200%. (Any value over 125% will reproduce the issue).
 - create a 800x600 window without SDL_ALLOW_HIGHDPI. Windows will scale (pixel-double) the SDL window to the correct logical size.
 - create a 800x600 window with SDL_ALLOW_HIGHDPI. The window will now appear shrunk down by 50%.

According to MSDN, a correct DPI-aware application must appear at the same logical size regardless of the DPI setting. In this specific case, if the user requests a window with a size of 800x600 points at 200% scaling, he/she should get a 1600x1200 pixel window with the correct logical size.

SDL already does this on Mac OS X: the same steps above will create a window with identical logical size but different resolutions.

[1] http://msdn.microsoft.com/en-us/library/ms701681%28v=vs.85%29.aspx
Comment 1 BurnSpamAddress 2013-12-24 17:23:31 UTC 
This is reproducible with Hg r8072.
Comment 2 Sam Lantinga 2013-12-24 20:21:33 UTC 
It's just not implemented at the moment. You're welcome to contribute a patch if you want it urgently.

Cheers,
Comment 3 BurnSpamAddress 2013-12-25 21:42:11 UTC 
Will do, I've already implemented this in the native backend for OpenTK (C#), so spinning a patch for SDL should be easy enough.
Comment 4 Sam Lantinga 2013-12-26 05:50:24 UTC 
Great, thanks! :)
Comment 5 Ryan C. Gordon 2015-02-24 04:49:05 UTC 
Marking this as a dupe of Bug #2713.

--ryan.

*** This bug has been marked as a duplicate of bug 2713 ***