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Michael Natterer authored
When PROJ_ROUND()ing e.g. 3.8, it ends up at 4, then we added the 0.5 offset to draw a nice cairo line in the middle of the pixel, effectively drawing a line that's meant to be at 3.8 at 4.5. Instead, we now use floor(x)+0.5 now which snaps the above example to 3.5. Also, calculate arcs like we calculate rectangles (transform the arc's bounding box and pixel-align that, then recalculate the center), so arcs properly align with rectangles.
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