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Incorrect text sub-pixel antialiasing on canvas
Reported by
jkieb...@esri.com,
Apr 23 2017
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Issue descriptionUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3078.0 Safari/537.36 Steps to reproduce the problem: 1. Draw white text on a canvas (external monitor, devicePixelRatio is 1) What is the expected behavior? Nicely anti-aliased completely white text What went wrong? It looks like subpixel anti-aliasing is kicking in wrongly, or at the wrong resolution. If I force -webkit-font-smoothing: antialiased (see test case) anti-aliasing works correctly. Also, if I forcefully supersample (i.e. assuming a devicePixelRatio of 2 even if it isn't), then I do get correct results. Did this work before? N/A Does this work in other browsers? Yes Chrome version: 60.0.3078.0 Channel: canary OS Version: OS X 10.11.6 Flash Version: Shockwave Flash 25.0 r0
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Apr 24 2017
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Apr 28 2017
Bisect Info: =========== Good build : 52.0.2743.0 , Revision Range - 394939 Bad build : 53.0.2744.0 , Revision Range - 395221 After executing the old revision bisect script, it as given all good builds. The following CL's between good and bad build versions: ========================================================= https://chromium.googlesource.com/chromium/src/+log/52.0.2743.0..53.0.2744.0?pretty=fuller&n=10000 The following are suspecting CL's : ----------- Review-Url: https://codereview.chromium.org/1995103002 - eae@ Review-Url: https://codereview.chromium.org/1997563002 - yosin@ Review-Url: https://codereview.chromium.org/1962413002 - xidachen@ CC'ing the concern owners, requesting them to look into this issue and help us to reassign this issue to the right owner. Note: ===== Issue is only reproducible in Mac 10.12.4 not on Windows 10 and Ubuntu 14.04
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Apr 28 2017
My patch[1] isn't related to canvas anti-aliasing. [1] http://crrev.com/1997563002: Get rid of a redundant function alias positionBeforeNode(), May 2016
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May 1 2017
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Jun 9 2017
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Comment 1 by jkieb...@esri.com
, Apr 23 2017