1921981 - Correctly handle the position and size of the snapshots

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, task, P3)

Description

[Nicolas Silva [:nical]]

The size of a stacking context is loosely defined in the WebRender display list. To render the snapshot as an image the next display list needs to know the exact bounds of the snapshots in local/layout space to to size and position the image display item that shows it.

To handle this, we could specify the local bounds of the snapshot in the stacking context display item or in a separate API, store it in the picture and use it as the reference for how the rasterized content is sized and positioned, probably in a way similar to the blob image visible area.

Comment 1

[Nicolas Silva [:nical]]

Attachment: Bug 1921981 - Adjust the image primitive to compensate for the difference in the picture's rasterized area. r=gw

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/cbd6a4e86db4
Adjust the image primitive to compensate for the difference in the picture's rasterized area. r=gw

Comment 3

[Norisz Fay [:noriszfay]]

https://hg.mozilla.org/mozilla-central/rev/cbd6a4e86db4