Bug 126653

Summary: Subpixel layout: RenderMultiColumnBlock::computeColumnCountAndWidth() needs flooring.
Product: WebKit Reporter: zalan <zalan>
Component: Layout and RenderingAssignee: zalan <zalan>
Status: RESOLVED INVALID    
Severity: Normal CC: jonlee, simon.fraser, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 126283    
Attachments:
Description Flags
rendering snapshots none

zalan
Reported 2014-01-08 11:59:43 PST
This is rather similar to bug 126646. We produce an off by one pixel rendering when subpixel is on, though flooring it to CSS pixel would defeat the purpose of subpixel positioning the column content. m_columnWidth = std::max<LayoutUnit>(0, (availWidth - ((m_columnCount - 1) * colGap)) / m_columnCount); failed cases: fast/multicol/newmulticol/column-rules-fixed-height.html fast/multicol/newmulticol/columns-shorthand-parsing.html fast/multicol/newmulticol/layers-in-multicol.html
Attachments
rendering snapshots (93.00 KB, image/jpeg)
2014-01-15 13:07 PST, zalan 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Simon Fraser (smfr)
Comment 1 2014-01-08 15:26:08 PST
Talk to Hyatt.
zalan
Comment 2 2014-01-15 13:07:43 PST
Created attachment 221301 [details] rendering snapshots
Radar WebKit Bug Importer
Comment 3 2014-01-15 13:08:31 PST
<rdar://problem/15827900>
zalan
Comment 4 2014-01-15 13:09:25 PST
FF(v26) rendering is in-between subpixel off and subpixel on. Prefer current subpixel rendering.
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