Bug 125133 - [Coordinated Graphics] An element with background-size:cover is drawn incorrectly under certain condition.
Summary: [Coordinated Graphics] An element with background-size:cover is drawn incorre...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: 528+ (Nightly build)
Hardware: PC Linux
: P2 Normal
Assignee: Nobody
URL: http://black.company100.com/test/back...
Keywords:
Depends on:
Blocks:
 
Reported: 2013-12-02 22:43 PST by Jeong Jin Gyeong
Modified: 2014-11-18 14:09 PST (History)
5 users (show)

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Description Jeong Jin Gyeong 2013-12-02 22:43:20 PST 
It is appeared in EFL. I checked at r159833.

Test:
  http://black.company100.com/test/background-size-cover/

The color of rightmost pixel is expected to be cyan.
Google Chrome 27 works correctly.
EFL MiniBrowser displays black pixel at rightmost.


I found 2 reappearance conditions.
The gap is appeared if at least one of the conditions is true.

1. Set position style of the element to fixed
  { position: fixed; }
2. Make the element an AC layer.
  { -webkit-transform: translateZ(0); }

The above test applies 2nd condition only. ( position: absolute, -webkit-transform: translateZ(0). )