Bug 20174 - weird faint lines on canvas when drawing lines
Summary: weird faint lines on canvas when drawing lines
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebCore Misc. (show other bugs)
Version: 528+ (Nightly build)
Hardware: Macintosh OS X 10.5
: P2 Normal
Assignee: Nobody
URL: http://www.whatwg.org/issues/data.html
Keywords: NeedsReduction
Depends on:
Blocks:
 
Reported: 2008-07-25 15:16 PDT by Ian 'Hixie' Hickson
Modified: 2010-07-01 11:24 PDT (History)
2 users (show)

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Description Ian 'Hixie' Hickson 2008-07-25 15:16:07 PDT 
STEPS TO REPRODUCE
1. load http://www.whatwg.org/issues/data.html
2. zoom in on the top left

ACTUAL RESULTS
faint lines

EXPECTED RESULTS
just the main line

If it's the fault of a bug in my script I apologise in advance. But I don't think it is.
Comment 1 Ian 'Hixie' Hickson 2008-07-25 15:17:05 PDT 
also visible on the blue line where the main line jumps up for a bit.
Comment 2 Oliver Hunt 2008-12-29 04:40:16 PST 
Slightly more minimal testcase at http://nerget.com/bugs/bug20174.html

The issue is the 'dots' for somereason we occasionally get subpixel lines being drawn back to the origin.  I suspect this is a CG-ism, but it'd be good to know if it occurs in the gtk/qt ports.