100374 2012-10-25 06:41:24 -0700 [Chromium] Repaint issues with subpixel stroke 2013-04-09 17:07:28 -0700 1 1 1 Unclassified WebKit SVG 528+ (Nightly build) Unspecified Unspecified RESOLVED WONTFIX P2 Normal --- 1 fmalita fmalita bsalomon krit leviw pdr reed schenney zimmermann oldest_to_newest 750749 0 170627 fmalita 2012-10-25 06:41:24 -0700 Created attachment 170627 Repaint artifacts on Chromium. Chromium bug: http://code.google.com/p/chromium/issues/detail?id=156597 The attached test exhibits repaint "ghosting" on Chromium. Subpixel stroke widths trigger Skia's hairline optimization (treating the stroke width as == 1 and modulating the color components). Combined with subpixel positioning, this means that we may end up touching pixels outside the computed repaint rect. Mike mentioned he's considering addressing this in Skia if he can find a way that doesn't impact the hairline optimization. In the meantime, we could inflate the repaint rect by .5 when USE(SKIA) to make sure we're covering the stroke. 872517 1 schenney 2013-04-09 17:07:28 -0700 Marked LayoutTest bugs, bugs with Chromium IDs, and some others as WontFix. Test failure bugs still are trackable via TestExpectations or disabled unit tests. 170627 2012-10-25 06:41:24 -0700 2012-10-25 06:41:24 -0700 Repaint artifacts on Chromium. subpixel-stroke.svg image/svg+xml 334 fmalita PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI4MDAiIGhlaWdo dD0iNjAwIj4KICA8cmVjdCBpZD0icmVjdCIgeD0iNS4yNSIgd2lkdGg9IjEwMCIgaGVpZ2h0PSIx MDAiIGZpbGw9Im5vbmUiIHN0cm9rZT0icmVkIiBzdHJva2Utd2lkdGg9IjAuNSIvPgoKICA8c2Ny aXB0PgogICAgdmFyIGZyYW1lID0gMDsKCiAgICBzZXRJbnRlcnZhbChmdW5jdGlvbigpIHsKICAg ICAgZG9jdW1lbnQuZ2V0RWxlbWVudEJ5SWQoJ3JlY3QnKS5zZXRBdHRyaWJ1dGUoJ3gnLCAoZnJh bWUrKyAvIDQpICUgODAwICk7CiAgICB9LCA1KTsKICA8L3NjcmlwdD4KPC9zdmc+Cg==