Image off by 3 pixels when using filters

Maren · 27 February 2010, 11:26

The screenshot on the left was taken with filtering off. The screenshot on the right was taken with filtering on. It happens regardless of the chosen filter or Graphics API.

What's even weirder is the way "Vert. position" slider works; it takes -4 to shift the image 1 line upwards (e.g. -3 won't have any apparent effect whatsoever) so in order to properly re-position the image, it has to be set to -12.

I'm using the latest beta for the test as filtering in previous builds didn't really work for me, but I'm aware that this is not a beta-exclusive issue.

Toni Wilen · 27 February 2010, 12:41

It is by design. Internally difference is very big between no filtering and any filter. (You can see even more difference if window is much bigger than visible area)

Maren · 27 February 2010, 13:55

Alright, thanks for the answer. Guess I'll have to test this further to get a better idea of what's going on with the pixel shifting thingy

27 February 2010, 11:26	#1
Maren Banned Join Date: Jul 2009 Location: * Posts: 567	Image off by 3 pixels when using filters The screenshot on the left was taken with filtering off. The screenshot on the right was taken with filtering on. It happens regardless of the chosen filter or Graphics API. What's even weirder is the way "Vert. position" slider works; it takes -4 to shift the image 1 line upwards (e.g. -3 won't have any apparent effect whatsoever) so in order to properly re-position the image, it has to be set to -12. I'm using the latest beta for the test as filtering in previous builds didn't really work for me, but I'm aware that this is not a beta-exclusive issue. Last edited by Maren; 03 March 2010 at 20:15.

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27 February 2010, 12:41	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,573	It is by design. Internally difference is very big between no filtering and any filter. (You can see even more difference if window is much bigger than visible area)

27 February 2010, 13:55	#3
Maren Banned Join Date: Jul 2009 Location: * Posts: 567	Alright, thanks for the answer. Guess I'll have to test this further to get a better idea of what's going on with the pixel shifting thingy

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