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As the target renderers operate at a different sample resolution then we
use internally for coordinate representation, there is always a potential
for discrepancies in the line gradients when passing around trapezoids.
To overcome this, the protocol specification of trapezoids uses the full
lines and vertical range as opposed to vertices and so long as we always
use the same lines for conjoint trapezoids, they remain abutting in the
rasteriser.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84115
Testcase: bug-84115
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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