136482 2014-09-03 06:07:48 -0700 Filters have weird clipping on compositing tile borders 2024-09-06 13:51:56 -0700 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) Unspecified Unspecified RESOLVED CONFIGURATION CHANGED https://bugs.webkit.org/show_bug.cgi?id=266295 http://codepen.io/adobe/pen/eJHgl InRadar P2 Normal --- 1 krit webkit-unassigned dino simon.fraser thorton webkit-bug-importer oldest_to_newest 1032890 0 krit 2014-09-03 06:07:48 -0700 On compositing tiles, filters are clipped and refiltered. This has really strange effects on gaussian blur filters. See the example at http://codepen.io/adobe/pen/eJHgl move the slider for the bottom iframe up and down. 1032898 1 krit 2014-09-03 07:46:36 -0700 (In reply to comment #0) > On compositing tiles, filters are clipped and refiltered. This has really strange effects on gaussian blur filters. See the example at http://codepen.io/adobe/pen/eJHgl move the slider for the bottom iframe up and down. A static tile grid doesn't work great for many SVG filters. There will always be situations where feDisplacementMap, feDropShadow, lightning filters, feGaussianBlur need pixels from different tiles. For feDisplacementMap it can even be hard to impossible to predict the exact area of possibly requested pixels. 1032899 2 krit 2014-09-03 08:20:32 -0700 It seems to be correct for CSS filter functions. I'd like to understand what is going on. It seems that we filter the whole element area for every tile. So for blur(10px) we would blur the element twice if the element is part of two tiles. Is that correct? Or are there other optimizations that just let us copy the margin area of the element that is required by the blur() filter? Even with the optimization (if it is implemented at all), SVG Filters like feDisplacementMap would suffer from the same problem and we would need to filter the whole element area. 1032921 3 webkit-bug-importer 2014-09-03 10:31:01 -0700 <rdar://problem/18216351> 1037478 4 238715 lveith 2014-09-26 07:44:14 -0700 Created attachment 238715 when a html-element is larger as the screen, than the drawing of th html-element is getting irritated by the standard-copositing-border-matrix when a html-element is larger (height or width) as the screen, than the drawing of th html-element (with an svg-filter applied) is getting irritated by the standard-copositing-border-matrix. The workarounds (to get separate Layer with) did not helps when element is bigger than screen, because compositing gets than again the standard-matrix(tile-size). Example-Workarounds which did not help in this case: -webkit-transform: matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1) translate3d(0, 0, 0); -webkit-transform: scale(1); -webkit-transform: translateZ(0); -webkit-backface-visibility: hidden; 1037479 5 238716 lveith 2014-09-26 07:47:18 -0700 Created attachment 238716 html-element with svg-filter gets irritated by compositing-borders 1037480 6 238717 lveith 2014-09-26 07:51:27 -0700 Created attachment 238717 when a html-element is larger as the screen, than the drawing of th html-element is getting irritated by the standard-copositing-border-matrix when a html-element is larger as the screen, than the drawing of th html-element is getting irritated by the standard-copositing-border-matrix when a html-element is larger (height or width) as the screen, than the drawing of th html-element (with an svg-filter applied) is getting irritated by the standard-copositing-border-matrix. The workarounds (to get separate Layer with) did not helps when element is bigger than screen, because compositing gets than again the standard-matrix(tile-size). Example-Workarounds which did not help in this case: -webkit-transform: matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1) translate3d(0, 0, 0); -webkit-transform: scale(1); -webkit-transform: translateZ(0); -webkit-backface-visibility: hidden; 2058280 7 simon.fraser 2024-09-06 13:51:56 -0700 I don't see any issues with the examples in this bug now. 238715 2014-09-26 07:44:14 -0700 2014-09-26 07:51:27 -0700 when a html-element is larger as the screen, than the drawing of th html-element is getting irritated by the standard-copositing-border-matrix filterTest3.html text/html 3464 lveith PCFET0NUWVBFIGh0bWw+CjxodG1sPjxoZWFkPgoKPHN0eWxlPgogZGl2IHsKIAlmaWx0ZXI6IHVy bCgjYmx1cjEpOwogCS13ZWJraXQtZmlsdGVyOiB1cmwoI2JsdXIxKTsKIAloZWlnaHQ6IDIwcHg7 CiAJcGFkZGluZzogMHB4OwogCW1hcmdpbjogMHB4OwogCWJhY2tncm91bmQtY29sb3I6IGxpZ2h0 c2FsbW9uOwogfQogCiBoMiB7CiAJYm9yZGVyLXRvcDogMnB4IHNvbGlkIGJsYWNrOwogfQogCiBo NCB7CiAJYm9yZGVyLXRvcDogMXB4IHNvbGlkIGxpZ2h0Z3JleTsKIH0KIAo8L3N0eWxlPgoKPHN0 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