Bug 78293 – Support cross-fade() of generated images (gradients, canvas, etc.)

• Status: NEW
• Component: CSS

[Tim Horton]

Created attachment 126400 [details]
extremely preliminary patch

We should support things like this:

background: -webkit-cross-fade(-webkit-cross-fade(-webkit-canvas(squares), -webkit-canvas(thirdsquares), 0.5), -webkit-canvas(othersquares), 0.5);

or this:

background: -webkit-cross-fade(-webkit-linear-gradient(red, blue), url("apple.gif"), 0.5);

<rdar://problem/10459872>

[Tim Horton]

I want to do some additional reorganization of CSSImageValue and co. to make this patch much smaller. Also, it still does some things I don't like. Still, it's a start! Also, it fixes animated-GIF-in-cross-fade, but I'll be splitting that out and attaching the (tiny) patch required to that bug.

[WebKit Review Bot]

Comment on attachment 126400 [details]
extremely preliminary patch

Attachment 126400 [details] did not pass chromium-ews (chromium-xvfb):
Output: http://queues.webkit.org/results/11486469

New failing tests:
css3/images/cross-fade-tiled.html
animations/cross-fade-border-image-source.html
transitions/cross-fade-border-image.html
css3/images/cross-fade-simple.html
css3/images/cross-fade-invalidation.html
transitions/cross-fade-background-image.html
animations/cross-fade-list-style-image.html
animations/cross-fade-webkit-mask-image.html
css3/images/cross-fade-blending.html
css3/images/cross-fade-overflow-position.html
animations/cross-fade-webkit-mask-box-image.html
animations/cross-fade-background-image.html
css3/images/cross-fade-sizing.html

[Shane Stephens]

*** Bug 79772 has been marked as a duplicate of this bug. ***

[Tim Horton]

*** Bug 90828 has been marked as a duplicate of this bug. ***

[Sam Weinig]

Once https://bugs.webkit.org/show_bug.cgi?id=246594 lands, this should be relatively straightforward to do. Taking this.