RESOLVED FIXED 232134
DisplayList::Recorder's clipBounds() becomes empty if a flip is applied to the CTM 
https://bugs.webkit.org/show_bug.cgi?id=232134
Summary DisplayList::Recorder's clipBounds() becomes empty if a flip is applied to th...
Tim Horton
Reported 2021-10-22 02:10:02 PDT
DisplayList::Recorder's clipBounds() becomes empty if a flip is applied to the CTM
Attachments
Patch (10.38 KB, patch)
2021-10-22 02:11 PDT, Tim Horton 		ews-feeder: commit-queue-
DetailsFormatted DiffDiff
Patch (9.86 KB, patch)
2021-10-22 02:33 PDT, Tim Horton 		no flags
DetailsFormatted DiffDiff
Patch (7.54 KB, patch)
2021-10-22 16:18 PDT, Tim Horton 		no flags
DetailsFormatted DiffDiff
Patch (11.09 KB, patch)
2021-10-22 16:34 PDT, Tim Horton 		no flags
DetailsFormatted DiffDiff
Patch (11.04 KB, patch)
2021-10-26 11:54 PDT, Tim Horton 		no flags
DetailsFormatted DiffDiff
Show Obsolete (4) View All Add attachment proposed patch, testcase, etc.
Tim Horton
Comment 1 2021-10-22 02:11:32 PDT
Created attachment 442135 [details] Patch
Tim Horton
Comment 2 2021-10-22 02:33:03 PDT
Created attachment 442138 [details] Patch
Tim Horton
Comment 3 2021-10-22 16:18:19 PDT
Created attachment 442215 [details] Patch
Tim Horton
Comment 4 2021-10-22 16:33:52 PDT
oops, lost the test
Tim Horton
Comment 5 2021-10-22 16:34:10 PDT
Created attachment 442220 [details] Patch
Tim Horton
Comment 6 2021-10-22 17:06:33 PDT
smfr asked for a layout test instead of an API test, but I've not found a way to get to the raw GraphicsContext::scale() from web content (the CSS 2D transform `scale(-1)` uses setCTM/concatCTM, which is not affected because mapping the rect through the transform maintains its positive size) in a way that it stays long enough to then introspect the clipBounds :) Anyway, the API test is kind of nice because it lets us check CG vs. DL directly.
Darin Adler
Comment 7 2021-10-23 22:35:58 PDT
Comment on attachment 442220 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=442220&action=review > Source/WebCore/platform/graphics/displaylists/DisplayListRecorder.cpp:449 > + if (std::optional<AffineTransform> inverse = currentState().ctm.inverse()) I would’ve used auto here; writing out the type makes this code harder to read, I think
Tim Horton
Comment 8 2021-10-26 11:54:11 PDT
Created attachment 442514 [details] Patch
EWS
Comment 9 2021-10-26 12:42:50 PDT
Committed r284888 (243565@main): <https://commits.webkit.org/243565@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 442514 [details].
Radar WebKit Bug Importer
Comment 10 2021-10-26 12:43:18 PDT
<rdar://problem/84677208>
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