[cairo-bugs] [Bug 84396] New: 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

          Priority: medium
            Bug ID: 84396
          Assignee: chris at chris-wilson.co.uk
           Summary: cairo-tor-scan-converter is off by half of a subrow.
        QA Contact: cairo-bugs at cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: sixtysix at inwind.it
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: image backend
           Product: cairo

Created attachment 106961
  --> https://bugs.freedesktop.org/attachment.cgi?id=106961&action=edit
quick hack

With the attached patch running:

> (cd test && CAIRO_TEST_TARGET=image DISPLAY=:2 .libs/cairo-test-suite record{,flip}-paint-alpha-clip-mask)

produces 2 pairs of images that are the 180°-rotated version of each other

test/output/recordflip-paint-alpha-clip-mask.image.argb32.out.png
test/output/record-paint-alpha-clip-mask.image.argb32.out.png

test/output/recordflip-paint-alpha-clip-mask.image.rgb24.out.png
test/output/record-paint-alpha-clip-mask.image.rgb24.out.png

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