131561 2014-04-11 13:51:55 -0700 Subpixel rendering: Content with ::before leaves bits behind while animating its position. 2014-04-13 23:35:11 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified ASSIGNED P2 Normal --- 1 zalan zalan joepeck simon.fraser oldest_to_newest 1000019 0 zalan 2014-04-11 13:51:55 -0700 it's the combination of ::before + (non-compositing)layer + starting position being off screen + moving the content by 0.05 (has to be less than 0.1) div:before { position: absolute; top: 0px; left: -1px; width: 100px; height: 100px; background-color: red; content: ""; } div { position: absolute; -webkit-transform: translateX(0px); } setInterval(function() { document.getElementById("foo").style.left = pos + "px"; pos += 0.05; }, 10); 1000020 1 229159 zalan 2014-04-11 13:52:26 -0700 Created attachment 229159 Test reduction 1000316 2 229240 zalan 2014-04-13 12:28:38 -0700 Created attachment 229240 Patch 1000317 3 229240 zalan 2014-04-13 12:29:10 -0700 Comment on attachment 229240 Patch EWS first. 1000407 4 229240 darin 2014-04-13 23:35:11 -0700 Comment on attachment 229240 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=229240&action=review > Source/WebCore/platform/LayoutUnit.h:948 > - return roundf((value.rawValue() * pixelSnappingFactor) / kEffectiveFixedPointDenominator) / pixelSnappingFactor; > + int rawValue = value.rawValue(); > + if (rawValue >= 0) > + return roundf((rawValue * pixelSnappingFactor) / kEffectiveFixedPointDenominator) / pixelSnappingFactor; > + > + // We need to ceil negative halfway values to maintain rounding direction. > + float halfwayRoundingValue = kEffectiveFixedPointDenominator / pixelSnappingFactor / 2; > + if (!fmodf(rawValue, halfwayRoundingValue)) > + return ceilf((rawValue * pixelSnappingFactor) / kEffectiveFixedPointDenominator) / pixelSnappingFactor; > + return roundf((rawValue * pixelSnappingFactor) / kEffectiveFixedPointDenominator) / pixelSnappingFactor; There is a simpler way of doing this without all the branching. Should just do floorf(x + 0.5f). 229159 2014-04-11 13:52:26 -0700 2014-04-11 13:52:26 -0700 Test reduction inspector-marker.html text/html 460 zalan PGh0bWw+CjxoZWFkPgo8c3R5bGU+CmRpdjpiZWZvcmUgewogcG9zaXRpb246IGFic29sdXRlOwog IHRvcDogMHB4OwogIGxlZnQ6IC0xcHg7CiAgd2lkdGg6IDEwMHB4OwogIGhlaWdodDogMTAwcHg7 CiAgYmFja2dyb3VuZC1jb2xvcjogcmVkOwogIGNvbnRlbnQ6ICIiOwp9CgpkaXYgewogIHBvc2l0 aW9uOiBhYnNvbHV0ZTsKICAtd2Via2l0LXRyYW5zZm9ybTogdHJhbnNsYXRlWCgwcHgpOwp9Cjwv c3R5bGU+CjwvaGVhZD4KPGJvZHk+CkJpZyBib3ggcmVkIHNob3VsZCBub3QgbGVhdmUgYml0cyBi ZWhpbmQuCjxkaXYgaWQ9Zm9vPjwvZGl2Pgo8c2NyaXB0PgogIHBvcyA9IDA7CiAgc2V0SW50ZXJ2 YWwoZnVuY3Rpb24oKSB7IGRvY3VtZW50LmdldEVsZW1lbnRCeUlkKCJmb28iKS5zdHlsZS5sZWZ0 ID0gcG9zICsgInB4IjsgcG9zICs9IDAuMDU7IH0sIDEwKTsKPC9zY3JpcHQ+CjwvYm9keT4KPC9o dG1sPg== 229240 2014-04-13 12:28:38 -0700 2014-04-13 23:35:11 -0700 Patch bug-131561-20140413122817.patch text/plain 6859 zalan U3VidmVyc2lvbiBSZXZpc2lvbjogMTY3MDcxCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D 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