Bug 126658 - Subpixel layout: RenderSlider's thumb position needs flooring.
Summary: Subpixel layout: RenderSlider's thumb position needs flooring.
Status: RESOLVED INVALID
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: 528+ (Nightly build)
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: zalan
URL:
Keywords: InRadar
Depends on:
Blocks: 126283
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Reported: 2014-01-08 13:24 PST by zalan
Modified: 2014-01-15 11:51 PST (History)
2 users (show)

See Also:

Attachments
slider knob position (193.43 KB, image/jpeg)
2014-01-15 11:50 PST, zalan 		no flags Details
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Description zalan 2014-01-08 13:24:00 PST 
LayoutUnit offset = percentageOffset * availableExtent;

with the following test case

<input type=range value=75 style="-webkit-transform: rotate(30deg)">

produces an off by one result when subpixel is on.

failed case:
fast/forms/range/input-appearance-range.html
Comment 1 Radar WebKit Bug Importer 2014-01-14 10:23:35 PST 
<rdar://problem/15815546>
Comment 2 zalan 2014-01-15 11:50:09 PST 
Created attachment 221289 [details]
slider knob position
Comment 3 zalan 2014-01-15 11:51:19 PST 
The new position does not make the slider's knob look less centered. It is just a different position. Prefer subpixel layout. (Can't compare to FF as this is a custom control)