1889093 - Scaled/large cached gradients are pixelated

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[Nicolas Silva [:nical]]

The cached gradients make the approximation that 1 layout pixels = device pixel. It was originally intentional but turned out to be a bad decision. In addition we cap the resolution of very large render task so if we fail to clip to the visible portion of the gradient, large gradients may end up pixelated due to that as well.

Porting gradients to the quad shader infrastructure mostly fixes the issue, and brings a few efficiency benefits related to how clipping is done.

I'll also block against this bug various gradient correctness issues caused by cached gradients, even when the issue is not obviously related to a pixelated rendering artifact.

Comment 1

[Nicolas Silva [:nical]]

Demoting to s3 since the whole gradient correctness bucket is s3.