Bug 132612 – "Flash of content without image" when pasting a raw image from the pasteboard

• Component: HTML Editing
• Status: RESOLVED FIXED

[Brady Eidson]

"Flash of content without image" when pasting a raw image from the pasteboard

The sequence of events goes like this:

-EditorMac has an ArchiveResource for the raw image and puts it in the document loader.
-Editor inserts the new document fragment with the <img> element for the raw image
-CachedResourceLoader is asked for the CachedImage for the new image
-Because a CachedImage doesn't exist yet, a "substitute resource delivery" is scheduled, where the ArchiveResource will be loaded after a zero-delay
-But before it is loaded, a layout and paint happens with the image resource missing, causing a radical change in layout and a "flash of content without image" that is quite noticeable.

I have a simple patch which lets certain flagged ArchiveResources load into a CachedResource synchronously.

It's a little deficient in that the load does not go through ResourceLoader and therefore doesn't get load callbacks.

In this case (pasting a raw image from the pasteboard that has a webkit-fake-url: url) the tradeoff seems fine...  but going forward we really need a better solution for this type of problem.

<rdar://problem/16826199>

[Brady Eidson]

Created attachment 230916 [details]
Patch v1

[Tim Horton]

It would be good if alexey or someone could peek at this too.

[Tim Horton]

r- because this affects more than just the single image case as discussed on IRC

[Brady Eidson]

Created attachment 230922 [details]
Patch v2 - Only in the "paste a single raw image" case

[WebKit Commit Bot]

Comment on attachment 230922 [details]
Patch v2 - Only in the "paste a single raw image" case

Clearing flags on attachment: 230922

Committed r168376: <http://trac.webkit.org/changeset/168376>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.