186127 2018-05-30 23:58:02 -0700 [iOS] Transformation matrix not preserved when pausing complex animation with Bézier timing function 2020-06-26 07:38:03 -0700 1 1 1 Unclassified WebKit Animations Safari 12 iPhone / iPad iOS 13 RESOLVED FIXED https://github.com/web-platform-tests/wpt/pull/11279 https://codepen.io/anon/pen/bWGobG InRadar P2 Normal --- 170784 186045 186129 1 fred.wang fred.wang dino graouts simon.fraser webkit-bug-importer oldest_to_newest 1428763 0 fred.wang 2018-05-30 23:58:02 -0700 Extracted from bug 170784. With the patch for bug 170784, http://codepen.io/anon/pen/bWGobG can be paused but the rotation angle is lost. 1428764 1 341645 fred.wang 2018-05-31 00:00:36 -0700 Created attachment 341645 Testcase Compare animations with linear timing function VS steps timing function. 1428817 2 341659 fred.wang 2018-05-31 05:11:01 -0700 Created attachment 341659 Patch 1428852 3 fred.wang 2018-05-31 09:07:29 -0700 Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/11279 1431171 4 342247 fred.wang 2018-06-08 02:42:07 -0700 Created attachment 342247 Patch Improved test. 1432679 5 342666 fred.wang 2018-06-13 09:51:04 -0700 Created attachment 342666 Another testcase So I tried to compare what happens on macOS and iOS and basically they both use CALayer's addAnimation to add two animations (translate and rotate) and later replace them by a zero-speed copy. Below are the output in PlatformCALayerCocoa::addAnimationForKey and PlatformCAAnimationRemote's addAnimationToLayer for the attached testcase. I don't see any obvious difference so my guess would be a bug in the iOS-implementation of the CALayer classes. == macOS == (lldb) p propertyAnimation.valueFunction.name (__NSCFConstantString *) $30 = 0x00007fffadc428c0 @"translate" (lldb) po propertyAnimation <CABasicAnimation:0x7f8ba545a2c0; delegate = <WebAnimationDelegate: 0x7f8ba5630530>; toValue = ( 90, 0, 0 ); fromValue = ( 0, 0, 0 ); valueFunction = <CAValueFunction: 0x7f8ba562ea20>; timingFunction = linear; additive = 0; removedOnCompletion = 0; fillMode = forwards; autoreverses = 0; repeatCount = 1; timeOffset = 2.30686; speed = 0; duration = 5; WKPlatformCAAnimationExplicitBeginTimeFlag = false; beginTime = 4023.49; keyPath = transform> (lldb) p propertyAnimation.valueFunction.name (__NSCFConstantString *) $34 = 0x00007fffadc42800 @"rotateZ" (lldb) po propertyAnimation <CABasicAnimation:0x7f8ba560c010; delegate = <WebAnimationDelegate: 0x7f8ba5630530>; toValue = 3.1415927410125732; fromValue = 0.0; valueFunction = <CAValueFunction: 0x7f8ba562ead0>; timingFunction = linear; additive = 1; removedOnCompletion = 0; fillMode = forwards; autoreverses = 0; repeatCount = 1; timeOffset = 2.30686; speed = 0; duration = 5; WKPlatformCAAnimationExplicitBeginTimeFlag = false; beginTime = 4023.49; keyPath = transform> == iOS == (lldb) p properties.valueFunction (const ValueFunctionType) $10 = Translate (lldb) po caAnimation.get() <CABasicAnimation:0x7fd694f9fd50; delegate = <WKAnimationDelegate: 0x7fd694eded40>; valueFunction = <CAValueFunction: 0x7fd694fd4d70>; fillMode = forwards; additive = 0; removedOnCompletion = 0; autoreverses = 0; speed = 0; repeatCount = 1; timeOffset = 2.30493; duration = 5; beginTime = 4494.56; timingFunction = linear; toValue = ( 90, 0, 0 ); fromValue = ( 0, 0, 0 ); keyPath = transform> (lldb) p properties.valueFunction (const ValueFunctionType) $12 = RotateZ (lldb) po caAnimation.get() <CABasicAnimation:0x7fd694feb1c0; delegate = <WKAnimationDelegate: 0x7fd694eded40>; valueFunction = <CAValueFunction: 0x7fd694fd43d0>; fillMode = forwards; additive = 1; removedOnCompletion = 0; autoreverses = 0; speed = 0; repeatCount = 1; timeOffset = 2.30493; duration = 5; beginTime = 4494.56; timingFunction = linear; toValue = 3.1415927410125732; fromValue = 0.0; keyPath = transform> 1438909 6 fred.wang 2018-07-03 11:47:22 -0700 Just tried again after https://trac.webkit.org/changeset/233460/webkit and animations of the testcases can be paused but the rotation angle is lost. I'm testing a trunk build on the iOS simulator using the public SDK. As said in comment 5, I don't see any difference between iOS and macOS regarding how animations are set on the CALayer, so I wonder whether the issue is actually in proprietary code. @Antoine Quint: Do you see the same bug with your setup? Do you think it's fixable in WebKit (maybe with a hack like the bug7311367Workaround function in GraphicsLayerCA)? 1468597 7 webkit-bug-importer 2018-10-12 14:35:28 -0700 <rdar://problem/45237786> 1468599 8 simon.fraser 2018-10-12 14:35:53 -0700 https://codepen.io/anon/pen/bWGobG still shows this bug on iOS. 1468600 9 webkit-bug-importer 2018-10-12 14:36:21 -0700 <rdar://problem/45237815> 1499493 10 fred.wang 2019-01-29 03:07:43 -0800 (In reply to Simon Fraser (smfr) from comment #8) > https://codepen.io/anon/pen/bWGobG still shows this bug on iOS. The bug still happens with the latest beta iOS 12.2 (January 24). 1537080 11 fred.wang 2019-05-17 04:08:14 -0700 (In reply to Frédéric Wang (:fredw) from comment #10) > (In reply to Simon Fraser (smfr) from comment #8) > > https://codepen.io/anon/pen/bWGobG still shows this bug on iOS. > > The bug still happens with the latest beta iOS 12.2 (January 24). Same in iOS beta 12.3 (May 13) 1537170 12 simon.fraser 2019-05-17 11:21:21 -0700 Doesn't seem to reproduce in Safari Tech Preview 82. 1537191 13 fred.wang 2019-05-17 12:02:32 -0700 (In reply to Simon Fraser (smfr) from comment #12) > Doesn't seem to reproduce in Safari Tech Preview 82. You mean macOS? This bug is iOS-specific 1548369 14 fred.wang 2019-06-26 23:02:14 -0700 In iOS 13 beta 2, the rotation angle seems to be preserved but the translation is lost. 1593327 15 fred.wang 2019-11-24 23:17:15 -0800 (In reply to Frédéric Wang (:fredw) from comment #14) > In iOS 13 beta 2, the rotation angle seems to be preserved but the > translation is lost. Same in iOS 13 beta 3 1666427 16 fred.wang 2020-06-26 07:38:03 -0700 (In reply to Frédéric Wang (:fredw) from comment #15) > (In reply to Frédéric Wang (:fredw) from comment #14) > > In iOS 13 beta 2, the rotation angle seems to be preserved but the > > translation is lost. > > Same in iOS 13 beta 3 This bug is fixed in iOS 14 beta (18A5301v). 341645 2018-05-31 00:00:36 -0700 2018-05-31 00:00:36 -0700 Testcase set-animation-play-state-to-paused-002.html text/html 2959 fred.wang PCFET0NUWVBFIGh0bWw+CjxodG1sIGNsYXNzPSJyZWZ0ZXN0LXdhaXQiPgogIDxoZWFkPgogICAg PG1ldGEgY2hhcnNldD0idXRmLTgiPgogICAgPHRpdGxlPkR5bmFtaWNhbGx5IHNldCBhbmltYXRp b24tcGxheS1zdGF0ZSB0byBwYXVzZWQ8L3RpdGxlPgogICAgPGxpbmsgcmVsPSJhdXRob3IiIHRp dGxlPSJJZ2FsaWEgUy5MLiIgaHJlZj0iaHR0cHM6Ly93d3cuaWdhbGlhLmNvbS8iPgogICAgPGxp bmsgcmVsPSJoZWxwIiBocmVmPSJodHRwczovL2RyYWZ0cy5jc3N3Zy5vcmcvY3NzLWFuaW1hdGlv bnMtMS8jYW5pbWF0aW9uLXBsYXktc3RhdGUiPgogICAgPG1ldGEgbmFtZT0iYXNzZXJ0IiBjb250 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