REGRESSION(r217695): Offscreen/overflowed items not being rendered while translating in-frame

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[Antti Koivisto]

We need backing for layers that will animate to view.

[Antti Koivisto]

<rdar://problem/32778748>

[Antti Koivisto]

Created attachment 313661 [details]
patch

[Antti Koivisto]

Created attachment 313662 [details]
patch

[Simon Fraser (smfr)]

Comment on attachment 313662 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=313662&action=review

> Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp:1399
> +    auto bounds = FloatRect(m_boundsOrigin, size());
> +    if (auto extent = animationExtent()) {

Did you verify that bounds and extent are in the same coordinate space?

> Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp:2303
> +            || commitState.ancestorWithTransformAnimationIntersectsCoverageRect // FIXME: Compute backing exactly for descendants of animating layers .

No space before period.

> LayoutTests/compositing/backing/transform-transition-from-outside-view.html:33
> +        .dot {
> +            position: absolute;
> +            top: 0;
> +            left: 0;
> +            height: 4px;
> +            width: 4px;
> +            background-color: silver;
> +        }

You're not using dots.

> LayoutTests/compositing/backing/transform-transition-from-outside-view.html:36
> +            -webkit-transform: translateX(0px);

Transforms are unprefixed.

[Build Bot]

Comment on attachment 313662 [details]
patch

Attachment 313662 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: http://webkit-queues.webkit.org/results/3980253

New failing tests:
compositing/backing/transform-transition-from-outside-view.html

[Build Bot]

Created attachment 313668 [details]
Archive of layout-test-results from ews121 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews121  Port: ios-simulator-wk2  Platform: Mac OS X 10.12.5

[Antti Koivisto]

> Did you verify that bounds and extent are in the same coordinate space?

Both seem to be in the coordinate space used by RenderLayer::calculateLayerBounds so I think this is correct.

[Antti Koivisto]

Created attachment 313682 [details]
patch

[Antti Koivisto]

Created attachment 313687 [details]
patch

[WebKit Commit Bot]

Comment on attachment 313687 [details]
patch

Clearing flags on attachment: 313687

Committed r218735: <http://trac.webkit.org/changeset/218735>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.