5526 2005-10-28 00:44:11 -0700 SVGs with filters look grainy when scaled 2014-05-12 05:54:35 -0700 1 1 1 Unclassified WebKit SVG 523.x (Safari 3) Mac OS X 10.4 RESOLVED DUPLICATE 31370 http://svg-whiz.com/svg/firefox-logo.svg HasReduction P4 Normal --- 11980 19835 19991 68469 5579 26389 1 eric webkit-unassigned abarth emacemac7 eric ian jeffschiller krit ossy webkit.review.bot oldest_to_newest 23099 0 eric 2005-10-28 00:44:11 -0700 SVGs with filters look grainy when scaled Currently we apply filters according to the abstract coordinate system of the graphic, NOT the device coordinate system (i.e. the final pixel coords when drawn to the screen). This can be *bad* for a couple reasons. 1. When you scale the resulting pixels, the result looks grainy. 2. You can end up rendering 6 billion pixels and only using 1% of that if that part of the image is scaled down. A couple ways to solve this: 1. Just figure out what the final CTM for the item/group in question and render only the necessary number of pixels. 2. (Better!) *delay* compositing of the result image. Instead pass the CIImage back to the parent container (the one calling draw()) and let it do the compositing (or apply it's own filters using that CIImage as an input). When you finally have to do the compositing, figure out the absolute CTM, etc. I guess 2. is really just an optimized version of 1. In either case, this will need to be solved. 25630 1 eric 2005-12-06 04:57:55 -0800 Erick said he would take a crack at this. 141467 2 krit 2009-08-19 06:47:30 -0700 If I understand your comment right, we do this right now. I scaled the feGaussianBlur and feColorMatrix of the W3C test suite and i don't see pixels. But maybe this is a result of antialiasing? 290164 3 krit 2010-10-06 02:46:19 -0700 Committed r69181: <http://trac.webkit.org/changeset/69181> 290170 4 ossy 2010-10-06 03:17:30 -0700 (In reply to comment #3) > Committed r69181: <http://trac.webkit.org/changeset/69181> It broke 2 tests on Qt bot: http://build.webkit.org/results/Qt%20Linux%20Release/r69181%20(21569)/svg/filters/shadow-on-filter-pretty-diff.html http://build.webkit.org/results/Qt%20Linux%20Release/r69181%20(21569)/svg/filters/shadow-on-rect-with-filter-pretty-diff.html 290181 5 krit 2010-10-06 03:56:49 -0700 Committed r69182: <http://trac.webkit.org/changeset/69182> 290240 6 krit 2010-10-06 05:48:20 -0700 Committed r69187: <http://trac.webkit.org/changeset/69187> 290244 7 krit 2010-10-06 06:01:18 -0700 This bug was fixed with the patch on bug 31370. Marking this bug as duplication of 31370 because fixes for the patch mention this bug. Sorry for that. *** This bug has been marked as a duplicate of bug 31370 *** 290323 8 webkit.review.bot 2010-10-06 08:42:54 -0700 http://trac.webkit.org/changeset/69187 might have broken GTK Linux 32-bit Debug 290324 9 webkit.review.bot 2010-10-06 08:43:03 -0700 http://trac.webkit.org/changeset/69188 might have broken GTK Linux 32-bit Debug