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https://docs.microsoft.com/en-us/windows-hardware/drivers/display/overlay-support
Overlay support. 04/20/2017; 2 minutes to read; In this article. DirectDraw also supports overlays. An overlay surface is one that can be displayed on top of the primary surface without altering the physical bits in the surface underneath it. With an overlay, registers are set that define a rectangle on the primary surface that contains the overlay surface.
https://docs.microsoft.com/en-us/windows/win32/medfound/hardware-overlay-support
Starting in Windows 7, Direct3D 9 supports hardware overlays. This support is intended primarily for video playback, and differs in some respects from earlier DirectDraw APIs: The overlay cannot be shrunk, mirrored, or deinterlaced. Source color keys and alpha blending are not supported. Overlays can be stretched if the overlay hardware ...
http://virtualdub.org/blog/pivot/entry.php?id=282
The way you get to overlays is a bit different in Windows 7. In older versions, they were a feature of DirectDraw, and that meant you basically couldn't do anything other than lock-and-load -- DirectDraw couldn't even do color conversion, other than what the hardware overlay itself supported.
https://www.worldeyecam.com/geovision-error-direct-draw-overlay-failed.html
GeoVision Error: "Direct draw overlay failed" GeoVision Error: "Direct draw overlay failed" GeoVision Back to GeoVision Support Support Home. Possible Causes. VGA card does not support Directdraw Solution. Update Microsoft Direct X. Update VGA card driver, if available.
http://pd.geovision.tw/faq/MonitoringSW/Directdraw_fail-a.pdf
1. The VGA card does not support Directdraw Overlay function, or the VGA card driver file is corrupted. 2. If the VNC (Virtual Network Computing) server software is installed on the same computer, the VNC’s video hook driver (Mirror Driver) may take control of the Directdraw Overlay application.
https://autohotkey.com/board/topic/24502-directdraw-overlay-proof-of-concept/
Feb 07, 2012 · DirectDraw Overlay (Proof of Concept) - posted in Scripts and Functions: This is only a proof of concept currently, on how to implement a DirectDraw Overlay in AHK.It may work with ATI cards, but not with nVidia cards which does not support RGB PixelFormat but only YUV. Mine is nVidia and it turned out to support only YUY2.
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