In Cairo environment, device scale factor is transparently handled by HW side using cairo_surface_set_device_scale. ImageBuffer ignores resolution factor now. So we Filter and FilterEffect should not consider that ImageBuffer's size is scaled. This leads crash in kangax's ES6 compat table page in HiDPI PC.
Created attachment 281745 [details] Patch WIP
Attachment 281745 [details] did not pass style-queue: ERROR: Source/WebCore/ChangeLog:8: You should remove the 'No new tests' and either add and list tests, or explain why no new tests were possible. [changelog/nonewtests] [5] Total errors found: 1 in 2 files If any of these errors are false positives, please file a bug against check-webkit-style.
Typical crashing page: ES6 compat table page. https://kangax.github.io/compat-table/es6/
Created attachment 281752 [details] Patch WIP2
Created attachment 281764 [details] Patch WIP3
Created attachment 281846 [details] Patch
Comment on attachment 281846 [details] Patch Thanks for your review!
Comment on attachment 281846 [details] Patch Clearing flags on attachment: 281846 Committed r202421: <http://trac.webkit.org/changeset/202421>
All reviewed patches have been landed. Closing bug.