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Old 04 August 2017, 00:18   #1
Photon's Avatar
Join Date: Nov 2004
Location: Hult / Sweden
Posts: 4,480
WinUAE 3.5.0 Overlay affects scaling

I'm using the attached PNG as overlay to get scanline control.

Steps to reproduce:
1. Default A500 configuration, Set Configuration, Start.
2. Insert a disk with something that scrolls something vertically or horizontally. Run it, looks correct.
3. Go Filter > Overlays > select an overlay, like the attached file.
4. You can now see a pixel line or column missing, depending on whether the something scrolls vertically or horizontally.

Since my overlay has only horizontal lines, and it removes a pixel column when scrolling horizontally, the overlay is fine and instead the scaling of the underlying Amiga-pixel graphics is shrunken by a Windows-pixel or two, both vertically and horizontally.

Speculation: this is perhaps the reason why I had to misalign the overlay by 1 Windows-pixel.
Attached Thumbnails
Click image for larger version

Name:	ScanlinesFinal.png
Views:	114
Size:	4.6 KB
ID:	54007  
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