[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 #19 from Massimo <sixtysix at inwind.it> ---
(In reply to comment #17)
> I think the rendering errors are now just the seams between fullrow stepping
> (e.g. bug-seams). I added
> 

Confirming, with a note: the errors in bug-seams are not full_row,
but the upper half of row 74 is rendered by sub_row whereas the lower
part is rendered by full_row. The two are not complementary.

Skimming the new code I'm not sure whether (lines 795...) it is correct
to use edge->cell there, to me it seems that edge->cell is the x at the
y of first subrow's center and for edges nearly horizontal it could be
slightly off with respect to the x corresponding to the y at the start
of the row. (it could be compensated in the code later though)

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