This bug report was migrated from our old Bugzilla tracker.

Reported in version: HG 2.1
Reported for operating system, platform: Windows 10, x86_64

Comments on the original bug report:

On 2017-07-21 23:21:06 +0000, Eric Wasylishen wrote:

1. have a monitor with scaling set in Windows display settings. I have 2880x1800 with 200% scaling.
2. run testgl2 with "--info all". You should get the SDL_assert(hmon != NULL); assertion failing in WIN_GetDisplayUsableBounds.

Unfortunately I think the code in SDL_windowsmodes.c is fundamentally broken wherever it attempts to convert coordinates in the DEVMODE struct (which are always in pixels, even under DPI virtualization) to virtual screen coordinates (what MonitorFromPoint takes).
I think the only correct fix is to get a HMONITOR by doing a EnumDisplayMonitors and looking for a monitor name matching the DEVMODE.dmDeviceName , but I'm not sure about this as the msdn docs don't seem to say how to get a HMONITOR from a DEVMODE.

Tested on SDL2 7cfe088fafba, Windows 10 1703, build 15063.447

On 2017-08-11 07:22:33 +0000, Eric Wasylishen wrote:

The patch I added in https://bugzilla.libsdl.org/show_bug.cgi?id=3714 fixes this.

On 2017-08-11 17:19:45 +0000, Sam Lantinga wrote:

Fixed, thanks!
https://hg.libsdl.org/SDL/rev/0060bcf673e8