Bug 90281 - Paddings are rounded to whole pixels
Summary: Paddings are rounded to whole pixels
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: 528+ (Nightly build)
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on: 90097
Blocks:
  Show dependency tree / graph
 
Reported: 2012-06-29 07:42 PDT by Behdad Esfahbod
Modified: 2012-06-29 07:42 PDT (History)
2 users (show)

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Description Behdad Esfahbod 2012-06-29 07:42:46 PDT 
Test with Chrome that has SUBPIXEL_LAYOUT enabled.  While testing for bug 90097, I came across this bug:

According to https://trac.webkit.org/wiki/LayoutUnit paddings are supposed to have subpixel precision, but this sample shows that they are being rounded:

  http://jsfiddle.net/behdad/ALd5F/5/

Output:

span[position:static; padding-right:7.5px]: rect.width=7
span[position:fixed; padding-right:7.5px]: rect.width=7
span[position:absolute; padding-right:7.5px]: rect.width=7
span[position:relative; padding-right:7.5px]: rect.width=7


Applying patches in bug 90097 fixes the two middle cases, but no the other two:

span[position:static; padding-right:7.5px]: rect.width=7
span[position:fixed; padding-right:7.5px]: rect.width=7.5
span[position:absolute; padding-right:7.5px]: rect.width=7.5
span[position:relative; padding-right:7.5px]: rect.width=7