Subpixel rendering: Composited layer with subpixel gap does not get painted properly when its position changes.

[zalan]

When the parent layer moves, the child layer needs to be repainted if the subpixel gap between the layer changes.

[zalan]

Created attachment 254139 [details]
Patch

[Simon Fraser (smfr)]

Not for review?

[zalan]

(In reply to comment #2)
> Not for review?
:) Yes for review.

[Simon Fraser (smfr)]

Comment on attachment 254139 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=254139&action=review

> LayoutTests/compositing/child-layer-with-subpixel-gap-needs-repaint-when-parent-moves.html:16
> +        -webkit-backdrop-filter: invert(1);

Does the test need to use a backdrop filter?

[zalan]

Created attachment 254175 [details]
Patch

[zalan]

(In reply to comment #4)
> Comment on attachment 254139 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=254139&action=review
> 
> > LayoutTests/compositing/child-layer-with-subpixel-gap-needs-repaint-when-parent-moves.html:16
> > +        -webkit-backdrop-filter: invert(1);
> 
> Does the test need to use a backdrop filter?
Good point.

[WebKit Commit Bot]

Comment on attachment 254175 [details]
Patch

Clearing flags on attachment: 254175

Committed r185152: <http://trac.webkit.org/changeset/185152>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.