http://bugs.freedesktop.org/show_bug.cgi?id=15006
Summary: [i965]translate & rotate the line cause Aliasing
Product: Mesa
Version: CVS
Platform: Other
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/i915
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected], [EMAIL PROTECTED]
System Environment:
--------------------------
--Platform: 965 (32bit & 64bit)
Mesa:
master branch
fcb7cb9e72ecac7c165a3a6ed7a033e2e6793a26
Xf86_video_intel:
master branch 1c0e4958564588162bc22a980567436dfc9d1e56
Xorg: 7.2
Drm:
master branch
9be916f3537599489e083437c9a948eb93004904
Bug detailed description:
--------------------------
This case tests position independence of anti-aliased
lines. The coverage of a line is calculated.
This line is then translated. Regardless of its new
position, the coverage should remain the same.
The error allowance is based on a minimum of 4
subpixel sampling. This yields 0.125 per pixel.
One half of a color epsilon (ERRORGENE in the case code)
is added per pixel to account for the rounding from a coverage
value to a shade. This sum is multiplied by the number of
pixels along the perimeter (twice width for ends,
plus twice length).
Reproduce steps:
----------------
start X
compile and run antialia
Current result:
----------------
the disparity between the coverages is bigger than the error margin
Expected result:
----------------
the disparity between the coverages should not bigger than the error margin
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