1330261 - Convert visible region to WR's clip region

Status: RESOLVED INCOMPLETE

(Core :: Graphics: WebRender, defect)

Description

[Ethan Lin[:ethlin]]

This is a following bug from bug 1322504. We should support adding subimage to webrender, since sometimes we need to add partial image according to the visible region.

Comment 1

[Ethan Lin[:ethlin]]

Actually the WR stacking context supports complex clip region. We should convert the visible region to complex clip region. Other layers (like borderLayer) also need it.

Comment 2

[Kartikaya Gupta (email:[e-mail])]

I don't know if stacking contexts will continue to have complex clips. WR will be undergoing some changes to separate scroll roots from stacking contexts. In particular see a snippet of discussion at http://logs.glob.uno/?c=mozilla%23gfx&s=31+Jan+2017&e=31+Jan+2017&h=complex#c292421 - you might want to check with mrobinson and/or kvark before assuming the stacking context will continue to have complex clip regions.

Comment 3

[Milan Sreckovic [:milan] (needinfo for best results)]

Have we resolved what needs to be done here?

Comment 4

[Kartikaya Gupta (email:[e-mail])]

IIRC this really only applies to the "layers" mode WR implementation and should be irrelevant in the layers-free mode, so we can probably close this bug. But Ethan can confirm.

Comment 5

[Ethan Lin[:ethlin]]

This bug is for layers mode. We can close the bug.