[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 #14 from Massimo <sixtysix at inwind.it> ---
With the last patch, comparing the output of the test a8-clear
with its 180°-rotated version, shows that all pixels computed
via sub_row are correct, while those with full_row are slighlty
wrong.

I've obtained the opposite result not altering the way e->x.quo .rem
is computed, but adjusting the rest.

The problem is that to share the same walker between full_row and 
sub_row, it would be necessary to use a grid with twice as many y
samples as the number of subrows. Cell corners for full_row and
cell centers for sub_row.

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