19650 2008-06-18 02:06:27 -0700 -webkit-gradient slows down scrolling when page has horizontal scrollbar 2010-01-25 15:21:31 -0800 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) All All RESOLVED FIXED http://w3future.com/weblog/stories/2008/06/16/adtinjs.xml InRadar P2 Normal --- 1 jhoneycutt webkit-unassigned adam+webkit bdakin dglazkov hyatt mitz rniwa simon.fraser oldest_to_newest 83745 0 jhoneycutt 2008-06-18 02:06:27 -0700 The site above has very slow scrolling. Not reproducible in Opera. Site uses some WebKit-specific CSS that could be responsible. Disabling styles results in normal scrolling speed. 83813 1 mrowe 2008-06-18 18:30:47 -0700 <rdar://problem/6020083> 125230 2 adam+webkit 2009-06-10 16:23:08 -0700 (In reply to comment #0) > The site above has very slow scrolling. Not reproducible in Opera. Site uses > some WebKit-specific CSS that could be responsible. Disabling styles results in > normal scrolling speed. > The slow vertical scrolling only seems to happen for me when the horizontal scrollbar is not scrolled completely to the left. As soon as the page is scrolled 1px horizontally, the vertical scrolling slows down considerably. If the horizontal scrollbar is on the left the vertical scrolling is fine. It also happens on http://www.apple.com/safari/whats-new.html 125237 3 31144 rniwa 2009-06-10 16:50:51 -0700 Created attachment 31144 simplified version of http://www.apple.com/safari/whats-new.html this reproduces the bug in Safari 4 (Windows 528.17) but the effect cannot be experienced (by human) in Chrome 3.0.183.1. 125238 4 31145 rniwa 2009-06-10 16:52:59 -0700 Created attachment 31145 sample HTML copied from http://www.apple.com/safari/whats-new.html This HTML reproduces the bug both in Chrome and Safari. The bug disappears when -webkit-gradient is removed. 125240 5 eric 2009-06-10 17:12:29 -0700 Hyatt wrote the scroll code and the gradient code. :) 125241 6 31147 eric 2009-06-10 17:12:54 -0700 Created attachment 31147 reduced test case 125242 7 eric 2009-06-10 17:15:08 -0700 This does not reproduce for me on a TOT Debug build. 125243 8 eric 2009-06-10 17:15:31 -0700 This may have been fixed since Safari 4? 125244 9 adam+webkit 2009-06-10 17:16:21 -0700 I tested it using Safari 4 final and with the latest WebKit running on OS X 10.5.7 125249 10 rniwa 2009-06-10 17:22:37 -0700 WebKit build 44547 on Windows reproduced the problem with the reduced test case. 125252 11 eric 2009-06-10 17:25:59 -0700 Wow. This still reproduces on TOT, but I only notice it in Release builds! 125270 12 mitz 2009-06-10 22:33:11 -0700 This is similar to bug 24130. GeneratedImage::drawPattern() is used to draw the gradient rather than GeneratedImage::draw(), the reason being that, even with the fix for bug 24130, the rect to paint legitimately contains more than one tile. As mentioned in that bug, the way to address this is probably by way of bug 24178. 125272 13 mitz 2009-06-10 22:40:55 -0700 There are other possible optimizations for vertical and horizontal gradients (adjusting the tile dimensions in the direction perpendicular to the gradient; won’t help with the “reduced test case” attached to this bug, but should help with the What’s New page, for example). 125273 14 simon.fraser 2009-06-10 23:12:32 -0700 I gather this is on Mac and Windows? 127093 15 rniwa 2009-06-19 18:54:42 -0700 (In reply to comment #14) > I gather this is on Mac and Windows? > Yes, we have observed it on Mac and Windows. But it may still reproduce in Linux. 181087 16 46638 mitz 2010-01-14 20:33:59 -0800 Created attachment 46638 Use 1-by-n tiles for horizontal and vertical linear gradients 181088 17 46638 simon.fraser 2010-01-14 20:41:02 -0800 Comment on attachment 46638 Use 1-by-n tiles for horizontal and vertical linear gradients > Index: WebCore/platform/graphics/Generator.h > =================================================================== > virtual void fill(GraphicsContext*, const FloatRect&) = 0; > + virtual void adjustParametersForTiledDrawing(IntSize& /* size */, FloatRect& /* srcRect */, TransformationMatrix& /* patternTransform */, FloatPoint& /* phase */) { Maybe remove patternTransform and phase from this method if you think they will never be used. They can easily be added if we find a use. r=me 181094 18 mitz 2010-01-14 21:11:44 -0800 Fixed in <http://trac.webkit.org/projects/webkit/changeset/53318> 184424 19 dglazkov 2010-01-25 15:21:31 -0800 Committed r53816: <http://trac.webkit.org/changeset/53816> 31144 2009-06-10 16:50:51 -0700 2009-06-10 17:12:54 -0700 simplified version of http://www.apple.com/safari/whats-new.html test.html text/html 8990 rniwa PCFET0NUWVBFIGh0bWw+IA0KPGh0bWwgbGFuZz0iZW4tdXMiPiANCjxoZWFkPg0KPHN0eWxlIHR5 cGU9InRleHQvY3NzIj4NCmh0bWwgeyBtaW4taGVpZ2h0OiAxMDAlOyB9DQpib2R5IHsgYmFja2dy b3VuZDogI2Y4ZjhmOCAtd2Via2l0LWdyYWRpZW50KGxpbmVhciwgbGVmdCBib3R0b20sIGxlZnQg dG9wLCBmcm9tKHJnYigyMjgsMjI5LDIzMCkpLCB0byhyZ2IoMjQ3LDI0NywyNDkpKSwgY29sb3It c3RvcCgwLjMscmdiKDIzNywyMzYsMjM4KSkpOyBtYXJnaW46IDAgYXV0bzsgbWluLWhlaWdodDog MTAwJTsgd2lkdGg6IDk4NHB4OyB9Cg0KLnJlcGxhY2VkIHsgZGlzcGxheTogYmxvY2s7IGhlaWdo dDogMTBweDsgb3ZlcmZsb3c6IGhpZGRlbjsgdGV4dC1pbmRlbnQ6IC05OTk5cHg7IHRleHQtYWxp 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