Bug 90281

Summary: Paddings are rounded to whole pixels
Product: WebKit Reporter: Behdad Esfahbod <behdad>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: eae, rbuis, rjkroege
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on: 90097    
Bug Blocks:    

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
Comment 1 Rob Buis 2021-04-03 14:08:31 PDT
This works these days.