Bug 15006 - translate & rotate the line cause Aliasing
Summary: translate & rotate the line cause Aliasing
Status: RESOLVED DUPLICATE of bug 9951
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/i915 (show other bugs)
Version: git
Hardware: Other Linux (All)
: medium normal
Assignee: marius predut
QA Contact:
Depends on:
Reported: 2008-03-14 02:23 UTC by Colin.Joe
Modified: 2015-05-06 12:47 UTC (History)
3 users (show)

See Also:
i915 platform:
i915 features:

ths case code (2.83 KB, text/plain)
2008-03-14 02:25 UTC, Colin.Joe

Description Colin.Joe 2008-03-14 02:23:38 UTC
System Environment:
--Platform: 965 (32bit & 64bit)
master branch 	

master branch	1c0e4958564588162bc22a980567436dfc9d1e56

Xorg:		 7.2

master branch		

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
Comment 1 Colin.Joe 2008-03-14 02:25:40 UTC
Created attachment 15113 [details]
ths case code
Comment 2 WuNian 2008-03-16 18:24:52 UTC
The bug exists on both i915 and i965.
Comment 3 Zou Nan hai 2008-03-24 19:36:48 UTC

*** This bug has been marked as a duplicate of bug 9951 ***
Comment 4 Adam Jackson 2009-08-24 12:29:37 UTC
Mass version move, cvs -> git
Comment 5 marius predut 2015-05-06 12:47:51 UTC
The patch series that fix this bug are upstream

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