[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 #5 from Massimo <sixtysix at inwind.it> ---
(In reply to comment #4)
> Created attachment 106989 [details] [review]
> move sample locations wrt edges
> 
> Pasting fail.

I tried this patch, but it does not produce the rotated images.

The problem is that the record* tests clip the rendering in many
2x2 rectangles, in that situation the scan-converter hardly executes
full_row, mainly sub_row (in every row there is a new or end edge)
and my idea above (offsetting half of a subrow) works in that case,
but it breaks the more general fullrow case in which that offset is
not necessary/correct.

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