[cairo-bugs] [Bug 84396] cairo-tor-scan-converter is off by half of a subrow.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84396

--- Comment #20 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 107186
  --> https://bugs.freedesktop.org/attachment.cgi?id=107186&action=edit
Walk fullrow edges between precise end-points.

For the inside a pixel check, I think cell is correct (the line has to go
between the cell end-points), but it does lose some precision when stepping
between pixels. I was looking at that, but didn't get my math right when I
spotted the bug and went to fix that.

bug-seams is indeed a different class (fullrow does the analytical coverage
computation, subrow does the sample coverage) and so there does remain yet
another asymmetry bug in tor somewhere.

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