Bug 152742 – Adjust tile coverage with margin tiles, and tidy up the indicator

• Component: New Bugs
• Status: RESOLVED FIXED

[Simon Fraser (smfr)]

Adjust tile coverage with margin tiles, and tidy up the indicator

[Simon Fraser (smfr)]

Created attachment 268297 [details]
Patch

[Beth Dakin]

Comment on attachment 268297 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=268297&action=review

> Source/WebCore/platform/graphics/ca/TileController.cpp:-395
> -    coverageHorizontalSize += leftMarginWidth() + rightMarginWidth();

In cases where widthScale and heightScale are still 1, will removing this code prevent coverage for margin tiles?

[Simon Fraser (smfr)]

(In reply to comment #2)
> Comment on attachment 268297 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=268297&action=review
> 
> > Source/WebCore/platform/graphics/ca/TileController.cpp:-395
> > -    coverageHorizontalSize += leftMarginWidth() + rightMarginWidth();
> 
> In cases where widthScale and heightScale are still 1, will removing this
> code prevent coverage for margin tiles?

Yes, but if you're not extending coverage for scrolling, I don't think you need to extend it to include margin tiles. Or is there some rubber banding case that would have issues?

[Simon Fraser (smfr)]

Comment on attachment 268297 [details]
Patch

This does actually cause a bug; rubber-banding on a page without extra tile coverage has missing margin tiles.

[Build Bot]

Comment on attachment 268297 [details]
Patch

Attachment 268297 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/654143

New failing tests:
tiled-drawing/simple-document-with-margin-tiles.html

[Build Bot]

Created attachment 268304 [details]
Archive of layout-test-results from ews107 for mac-yosemite-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews107  Port: mac-yosemite-wk2  Platform: Mac OS X 10.10.5

[Simon Fraser (smfr)]

Created attachment 268321 [details]
Patch

[Simon Fraser (smfr)]

https://trac.webkit.org/r194607