TileController doesn't remove tiles when the view is resized, leading to stale content

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[Tim Horton]

You can see this when browsing around Amazon with Aggressive Tile Retention on:

1. Go to http://www.amazon.com/Best-Sellers-Video-Games-PlayStation-Hardware/zgbs/videogames/14210751/
2. Scroll to the bottom.
3. Click on the next page of results.
4. Scroll to the bottom.
5. Move the mouse around. You'll probably see stale content start repainting.

<rdar://problem/13520671>

[Tim Horton]

Created attachment 197194 [details]
patch

[Simon Fraser (smfr)]

Comment on attachment 197194 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=197194&action=review

> Source/WebCore/platform/graphics/ca/mac/TileController.mm:736
> +            if (it->key.y() < topLeftForBounds.y()
> +                || it->key.y() > bottomRightForBounds.y()
> +                || it->key.x() < topLeftForBounds.x()
> +                || it->key.x() > bottomRightForBounds.x())

Would be cleaner if you copied it->key into a TileIndex variable.

[Tim Horton]

http://trac.webkit.org/changeset/148102