Originally Posted by Layback_
AFAIK, drawing something like 10.42 pixel by 10.55 pixel is not available (not only on WoW, but on PC in general) as the minimal unit is 1 pixel.
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This is correct. Well, technically there are subpixels which, while relevant to the topic, is not really necessary to explain the concept.
Put simply, if you have a black texture and a white texture directly next to each other which align perfectly to the pixel grid, things will work as expected. However, if they are positioned such that the border between the two texture ends up (logically) in the middle of a pixel, that one pixel will be be gray.
At least, that's the idea. After testing briefly in game I couldn't actually produce any fractional pixel drawing... :thinking: Not sure under what circumstances it will occur.