Backing-sharing layers with transforms render incorrectly

[Simon Fraser (smfr)]

If a layer gets backing-shared that has a transform, the rendering is incorrect.

Affects http://www.deeplearningbook.org/contents/intro.html

[Radar WebKit Bug Importer]

<rdar://problem/50652127>

[Simon Fraser (smfr)]

Created attachment 369544 [details]
Patch

[Simon Fraser (smfr)]

Created attachment 369561 [details]
WIP

[Simon Fraser (smfr)]

Created attachment 369637 [details]
Patch

[Antti Koivisto]

Comment on attachment 369637 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=369637&action=review

> LayoutTests/compositing/shared-backing/shared-layer-has-transform-expected.html:31
> +        .trigger {
> +            transform: translateZ(0);

I imagine we might optimimize this case some day to not composite so this might not be the safest trigger.

[Simon Fraser (smfr)]

(In reply to Antti Koivisto from comment #5)
> Comment on attachment 369637 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=369637&action=review
> 
> > LayoutTests/compositing/shared-backing/shared-layer-has-transform-expected.html:31
> > +        .trigger {
> > +            transform: translateZ(0);
> 
> I imagine we might optimimize this case some day to not composite so this
> might not be the safest trigger.

When that happens we'll have to change a lot of tests :)

[EWS Watchlist]

Comment on attachment 369637 [details]
Patch

Attachment 369637 [details] did not pass mac-ews (mac):
Output: https://webkit-queues.webkit.org/results/12160154

New failing tests:
compositing/shared-backing/shared-transformed-layer-bounds.html
compositing/shared-backing/sharing-layer-has-effect.html
compositing/shared-backing/sharing-layer-becomes-non-scrollable.html

[EWS Watchlist]

Created attachment 369638 [details]
Archive of layout-test-results from ews102 for mac-highsierra

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews102  Port: mac-highsierra  Platform: Mac OS X 10.13.6

[Simon Fraser (smfr)]

Added a couple of test files by mistake. Why is mac-wk2 green?

[Simon Fraser (smfr)]

Created attachment 369639 [details]
Patch

[EWS Watchlist]

Comment on attachment 369637 [details]
Patch

Attachment 369637 [details] did not pass mac-debug-ews (mac):
Output: https://webkit-queues.webkit.org/results/12160202

New failing tests:
compositing/shared-backing/shared-transformed-layer-bounds.html
compositing/shared-backing/sharing-layer-has-effect.html
compositing/shared-backing/sharing-layer-becomes-non-scrollable.html

[EWS Watchlist]

Created attachment 369641 [details]
Archive of layout-test-results from ews115 for mac-highsierra

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews115  Port: mac-highsierra  Platform: Mac OS X 10.13.6

[EWS Watchlist]

Comment on attachment 369637 [details]
Patch

Attachment 369637 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: https://webkit-queues.webkit.org/results/12160230

New failing tests:
compositing/shared-backing/shared-transformed-layer-bounds.html
compositing/shared-backing/sharing-layer-has-effect.html
compositing/shared-backing/sharing-layer-becomes-non-scrollable.html

[EWS Watchlist]

Created attachment 369642 [details]
Archive of layout-test-results from ews125 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews125  Port: ios-simulator-wk2  Platform: Mac OS X 10.14.4

[EWS Watchlist]

Comment on attachment 369639 [details]
Patch

Attachment 369639 [details] did not pass mac-ews (mac):
Output: https://webkit-queues.webkit.org/results/12160567

New failing tests:
compositing/geometry/limit-layer-bounds-clipping-ancestor.html
compositing/overflow/clipping-behaviour-change-is-not-propagated-to-descendants.html
compositing/overflow/clipping-behaviour-change-is-not-propagated-to-descendants2.html
compositing/shared-backing/shared-layer-bounds.html

[EWS Watchlist]

Created attachment 369643 [details]
Archive of layout-test-results from ews103 for mac-highsierra

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews103  Port: mac-highsierra  Platform: Mac OS X 10.13.6

[EWS Watchlist]

Comment on attachment 369639 [details]
Patch

Attachment 369639 [details] did not pass mac-wk2-ews (mac-wk2):
Output: https://webkit-queues.webkit.org/results/12160593

New failing tests:
compositing/shared-backing/overflow-scroll/nested-absolute-with-clipping-in-stacking-overflow.html
compositing/geometry/limit-layer-bounds-clipping-ancestor.html
compositing/shared-backing/overflow-scroll/composited-absolute-in-absolute-in-relative-in-scroller.html
compositing/overflow/clipping-behaviour-change-is-not-propagated-to-descendants.html
compositing/shared-backing/overflow-scroll/relative-in-div-in-overflow-scroll.html
compositing/shared-backing/overflow-scroll/shared-layer-repaint.html
compositing/overflow/clipping-behaviour-change-is-not-propagated-to-descendants2.html
compositing/shared-backing/shared-layer-bounds.html

[EWS Watchlist]

Created attachment 369644 [details]
Archive of layout-test-results from ews107 for mac-highsierra-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews107  Port: mac-highsierra-wk2  Platform: Mac OS X 10.13.6

[EWS Watchlist]

Comment on attachment 369639 [details]
Patch

Attachment 369639 [details] did not pass win-ews (win):
Output: https://webkit-queues.webkit.org/results/12160695

New failing tests:
imported/blink/compositing/squashing/squash-overflow-hidden-contents.html

[EWS Watchlist]

Created attachment 369645 [details]
Archive of layout-test-results from ews215 for win-future

The attached test failures were seen while running run-webkit-tests on the win-ews.
Bot: ews215  Port: win-future  Platform: CYGWIN_NT-10.0-17763-3.0.5-338.x86_64-x86_64-64bit

[EWS Watchlist]

Comment on attachment 369639 [details]
Patch

Attachment 369639 [details] did not pass mac-debug-ews (mac):
Output: https://webkit-queues.webkit.org/results/12160617

New failing tests:
compositing/overflow/clipping-behaviour-change-is-not-propagated-to-descendants2.html
compositing/overflow/clipping-behaviour-change-is-not-propagated-to-descendants.html
compositing/geometry/limit-layer-bounds-clipping-ancestor.html
compositing/shared-backing/shared-layer-bounds.html

[EWS Watchlist]

Created attachment 369646 [details]
Archive of layout-test-results from ews114 for mac-highsierra

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews114  Port: mac-highsierra  Platform: Mac OS X 10.13.6

[EWS Watchlist]

Comment on attachment 369639 [details]
Patch

Attachment 369639 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: https://webkit-queues.webkit.org/results/12160643

New failing tests:
compositing/shared-backing/overflow-scroll/nested-absolute-with-clipping-in-stacking-overflow.html
compositing/geometry/limit-layer-bounds-clipping-ancestor.html
compositing/shared-backing/overflow-scroll/composited-absolute-in-absolute-in-relative-in-scroller.html
compositing/overflow/clipping-behaviour-change-is-not-propagated-to-descendants.html
compositing/shared-backing/overflow-scroll/relative-in-div-in-overflow-scroll.html
compositing/shared-backing/overflow-scroll/shared-layer-repaint.html
compositing/overflow/clipping-behaviour-change-is-not-propagated-to-descendants2.html
compositing/shared-backing/shared-layer-bounds.html

[EWS Watchlist]

Created attachment 369647 [details]
Archive of layout-test-results from ews124 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews124  Port: ios-simulator-wk2  Platform: Mac OS X 10.14.4

[Simon Fraser (smfr)]

Created attachment 369652 [details]
Patch

[Simon Fraser (smfr)]

*** Bug 197783 has been marked as a duplicate of this bug. ***

[WebKit Commit Bot]

Comment on attachment 369652 [details]
Patch

Clearing flags on attachment: 369652

Committed r245205: <https://trac.webkit.org/changeset/245205>