150556 2015-10-26 06:01:41 -0700 Garbage is displayed when root svg element has mix-blend-mode set 2016-01-27 18:21:38 -0800 1 1 1 Unclassified WebKit SVG WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 kari.pihkala sabouhallawa commit-queue esprehn+autocc glenn kondapallykalyan sabouhallawa simon.fraser webkit-bug-importer zalan zimmermann oldest_to_newest 1136512 0 264043 kari.pihkala 2015-10-26 06:01:41 -0700 Created attachment 264043 test file which has svg root element with mix-blend-mode If the mix-blend-mode css property has been set to something else than "normal" in the root svg element, then the page displays garbage (possibly unallocated memory?). Steps to reproduce: 1. Open the attached mixblend.svg file in the browser 2. Resize the browser window to see garbage I expect to see a yellow rectangle with a white page background, not garbage. Tested Safari 9.0.1 and Webkit nightly (10601.2.7.2, r191553). 1136513 1 kari.pihkala 2015-10-26 07:14:43 -0700 > (possibly unallocated memory?) I meant uninitialized :) Also, the svg document needs to be opened as a top level document. 1136759 2 webkit-bug-importer 2015-10-26 21:38:51 -0700 <rdar://problem/23270918> 1158199 3 269719 sabouhallawa 2016-01-24 19:51:52 -0800 Created attachment 269719 Patch 1158206 4 269719 darin 2016-01-24 21:11:59 -0800 Comment on attachment 269719 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=269719&action=review > Source/WebCore/ChangeLog:15 > + In SVGRenderingContext::prepareToRenderSVGContent(), the clip() is called > + before beginTransparencyLayer() which calls save(). We need to move this > + call after the call to beginTransparencyLayer() to ensure the clipping will > + be restored to its previous state when endTransparencyLayer() is called in > + the destructor of SVGRenderingContext. This is surprising. I thought that: 1) setting a clip before calling beginTransparencyLayer reduces the amount of memory that has to be allocated in order to create a transparency layer 2) endTransparencyLayer does not guarantee a restore I was probably wrong about (2), but was I wrong about (1)? Can we just add another save/restore instead? 1158398 5 269719 simon.fraser 2016-01-25 11:19:57 -0800 Comment on attachment 269719 Patch This seems like the wrong approach. I think what's missing is a save/restore around setting the clip. 1159168 6 269967 sabouhallawa 2016-01-26 18:54:46 -0800 Created attachment 269967 Patch 1159169 7 269968 sabouhallawa 2016-01-26 18:55:26 -0800 Created attachment 269968 Another test case 1159175 8 sabouhallawa 2016-01-26 19:01:03 -0800 Yes I took a wrong approach in the previous patch. I was trying that patch on WK1 with test cases which do not force compositing. These test cases did not produce the bug with or without the patch. 1159200 9 269978 sabouhallawa 2016-01-26 20:12:13 -0800 Created attachment 269978 One more test case 1159566 10 269967 commit-queue 2016-01-27 18:21:34 -0800 Comment on attachment 269967 Patch Clearing flags on attachment: 269967 Committed r195724: <http://trac.webkit.org/changeset/195724> 1159567 11 commit-queue 2016-01-27 18:21:38 -0800 All reviewed patches have been landed. Closing bug. 264043 2015-10-26 06:01:41 -0700 2015-10-26 06:01:41 -0700 test file which has svg root element with mix-blend-mode mixblend.svg image/svg+xml 207 kari.pihkala PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+Cjxz dmcgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB2aWV3Qm94PSIwIDAgMzIwIDI0 MCIgc3R5bGU9Im1peC1ibGVuZC1tb2RlOiBvdmVybGF5OyI+CiAgPHJlY3QgZmlsbD0ieWVsbG93 IiB3aWR0aD0iMTAwIiBoZWlnaHQ9IjEwMCIvPgo8L3N2Zz4K 269719 2016-01-24 19:51:52 -0800 2016-01-26 18:54:43 -0800 Patch bug-150556-20160124195125.patch text/plain 5554 sabouhallawa U3VidmVyc2lvbiBSZXZpc2lvbjogMTk1NDE2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggOWVhYzMyMjI5NmRiMzY5 ZTM0NTQ2ZTZiZDllMmY5NzU3OTkwMDM5ZC4uZmY1ZTVkYTJhZWY0OTllODY1NGQxNGM1YWEzMzdl OWU2ODQxYjYwYiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI0IEBACisyMDE2LTAxLTI0ICBTYWlk 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