114035 2013-04-05 07:52:10 -0700 REGRESSION (r147502): Accelerated reference filters are broken 2022-07-13 15:30:13 -0700 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) Unspecified Unspecified RESOLVED CONFIGURATION CHANGED P2 Normal --- 114051 68469 1 senorblanco mvujovic bfulgham darin dino krit simon.fraser thorton oldest_to_newest 869772 0 senorblanco 2013-04-05 07:52:10 -0700 Accelerated reference filters no longer work after r147502 when added dynamically to an element's style. 869774 1 196633 senorblanco 2013-04-05 07:52:42 -0700 Created attachment 196633 Test case 869777 2 196634 senorblanco 2013-04-05 08:23:40 -0700 Created attachment 196634 Better test case (reftest) 869790 3 mvujovic 2013-04-05 08:58:20 -0700 Thanks for the test cases! First idea that comes to mind is that we might need to put a RenderLayerBacking::updateFilters call back in updateGraphicsLayerGeometry. I'll investigate. 869824 4 senorblanco 2013-04-05 09:53:17 -0700 Just to let you know, I'm probably going to revert r147502 in blink for now. Once you get a fix, let me know and we can reland it. 869826 5 mvujovic 2013-04-05 09:58:06 -0700 (In reply to comment #4) > Just to let you know, I'm probably going to revert r147502 in blink for now. > > Once you get a fix, let me know and we can reland it. If this isn't blocking your work for today, I'm working on a fix. If it's blocking, go ahead and revert. Sorry! 869854 6 mvujovic 2013-04-05 10:37:31 -0700 Note this doesn't repro in Safari. I don't think Safari accelerates the SVG reference filter. 869855 7 senorblanco 2013-04-05 10:41:28 -0700 (In reply to comment #6) > Note this doesn't repro in Safari. I don't think Safari accelerates the SVG reference filter. No, only Chrome does. Safari falls back to the non-composited path for reference filters, AFAIK. 869902 8 mvujovic 2013-04-05 11:33:23 -0700 Ok, I figured it out. Patch and explanation coming up! 869944 9 196664 mvujovic 2013-04-05 12:18:03 -0700 Created attachment 196664 Patch The problem is that we rely on FilterEffectRenderer to build the filter graph, and we call backing()->updateFilters() before we have a FilterEffectRenderer. Here's what's happening now in RenderLayer::updateFilters: 1) Call backing()->updateFilters() to see if we can paint the filters in the compositor. It returns true, but the filter graph is not built yet, so the compositor doesn't get it. 2) Call updateOrRemoveFilterEffectRenderer(), which creates a FilterEffectRenderer if we're painting filters in software (we're not) or if we have an SVG reference filter (we do). The simplest fix right now is to call backing()->updateFilters() again as step #3, after we have a FilterEffectRenderer. Before, when we called updateFilters() in RenderLayerBacking::updateGraphicsLayerGeometry, the call happened late enough to have a FilterEffectRenderer for SVG reference filters, but too late to fall back to software filter painting. The long-term fix is to extract the SVG graph building functionality out of FilterEffectRenderer, and make it happen in RenderLayer::computeFilterOperations. We can take our time to fix this correctly in WebKit, since no port is accelerating SVG reference filters right now. I've filed a bug for that: https://bugs.webkit.org/show_bug.cgi?id=114051 For Blink, this patch should fix it right now until Blink can get the long-term fix. There are additional comments in the patch. 874804 10 senorblanco 2013-04-12 09:43:24 -0700 Although the bug only affects blink currently (and has been fixed there), it might be a good idea to land the test here in WebKit, just in case someone runs into the same problem here. I leave it up to WebKit reviewers to decide. 874886 11 196634 darin 2013-04-12 11:50:51 -0700 Comment on attachment 196634 Better test case (reftest) Test looks OK to me, but even a test needs a change log for review and commit. 874887 12 darin 2013-04-12 11:51:33 -0700 It would really be good to get this reftest landed. Someone could do the work to add a change log entry and get it in. 874909 13 mvujovic 2013-04-12 12:44:41 -0700 (In reply to comment #12) > It would really be good to get this reftest landed. Someone could do the work to add a change log entry and get it in. I'd be happy to write the ChangeLog entry and reupload. 875018 14 197900 mvujovic 2013-04-12 15:57:42 -0700 Created attachment 197900 Patch Added ChangeLog to senorblanco's test. However, the test is failing locally on Safari due, seemingly due to color space and/or precision issues. In the PNGs generated by DRT: The expected PNG has a color of RGB(0, 249, 0) in Photoshop. The actual png has a color of RGB(2, 249, 0) in Photoshop. When I load the files locally: The expected file has a native color of RGB(0, 255, 0). The test file has a native color of RGB(145, 249, 45) on my monitor, and depends on color space. This needs some more investigation before landing, or the quick "fix" is to make it a pixel test instead of a reftest. 1883407 15 bfulgham 2022-07-13 15:30:13 -0700 This code has been significantly refactored since this patch was proposed. There doesn't seem to be any action we can take here. 196633 2013-04-05 07:52:42 -0700 2013-04-05 07:52:42 -0700 Test case effect-reference-add-hw.patch text/plain 665 senorblanco ZGlmZiAtLWdpdCBhL0xheW91dFRlc3RzL2NzczMvZmlsdGVycy9lZmZlY3QtcmVmZXJlbmNlLWFk ZC1ody5odG1sIGIvTGF5b3V0VGVzdHMvY3NzMy9maWx0ZXJzL2VmZmVjdC1yZWZlcmVuY2UtYWRk LWh3Lmh0bWwKbmV3IGZpbGUgbW9kZSAxMDA2NDQKaW5kZXggMDAwMDAwMC4uYmE0MWZhOQotLS0g L2Rldi9udWxsCisrKyBiL0xheW91dFRlc3RzL2NzczMvZmlsdGVycy9lZmZlY3QtcmVmZXJlbmNl LWFkZC1ody5odG1sCkBAIC0wLDAgKzEsMTIgQEAKKzxzdmcgeG1sbnM9Imh0dHA6Ly93d3cudzMu b3JnLzIwMDAvc3ZnIiB3aWR0aD0iMCIgaGVpZ2h0PSIwIiB2ZXJzaW9uPSIxLjEiPgorICA8ZGVm cz4KKyAgICA8ZmlsdGVyIGlkPSJjb2xvcm1hdHJpeCI+CisgICAgICA8ZmVDb2xvck1hdHJpeCB0 eXBlPSJodWVSb3RhdGUiIHZhbHVlcz0iMTgwIi8+CisgICAgPC9maWx0ZXI+CisgIDwvZGVmcz4K Kzwvc3ZnPgorPGltZyBzcmM9InJlc291cmNlcy9yZWZlcmVuY2UucG5nIiBpZD0iaW1nMSIgc3R5 bGU9Ii13ZWJraXQtdHJhbnNmb3JtOiB0cmFuc2xhdGVaKDApOyI+Cis8c2NyaXB0PgordmFyIGlt 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