Bug 126658

Summary:

Subpixel layout: RenderSlider's thumb position needs flooring.

Product:

WebKit

Reporter:

zalan <zalan>

Component:

Layout and Rendering

Assignee:

zalan <zalan>

Status:

RESOLVED INVALID

Severity:

Normal

CC:

jonlee, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

528+ (Nightly build)

Hardware:

Unspecified

OS:

Unspecified

Bug Depends on:

Bug Blocks:

126283

Attachments:

Description	Flags
slider knob position	none

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)