NEW185673
Letter spacing in canvas text renders differently based on sub pixel placement 
https://bugs.webkit.org/show_bug.cgi?id=185673
Summary Letter spacing in canvas text renders differently based on sub pixel placement
Jon Lee
Reported 2018-05-15 23:00:27 PDT
Created attachment 340470 [details] Test See test page. I'm rendering text at various sub-pixel locations. The text appears to jiggle. It's worse 1x than 2x. Compare to Chrome and Firefox, which do not suffer from this.
Attachments
Test (1.48 KB, text/html)
2018-05-15 23:00 PDT, Jon Lee 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2018-05-15 23:01:40 PDT
<rdar://problem/40285072>
Myles C. Maxfield
Comment 2 2018-05-15 23:46:03 PDT
Yeah, we have a dupe of this. Every time we disable sub pixel quantization, we get a huge regression because our CoreGraphics glyph cache hit rate plummets.
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