1712452 - [sw-wr]Incorrect rendering on codepen demo

Status: NEW

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

Description

[Mayank Bansal]

enable swwr
Go to : https://codepen.io/ayushi20-19/pen/gOmrBzm

AR: there is an addition sixth "leaf", some addiional elements drawn near the tail
ER: not so

Comment 1

[Mayank Bansal]

2021-05-22T18:08:46.227000: DEBUG : Found commit message:
Bug 1682194 - Accelerate cs_clip_rectangle in SWGL. r=jrmuizel

cs_clip_rectangle is slow because we evaluate distance AA for every fragment
the shader touches. With SWGL, we can do much better since we have control
over span. We calculate an inner opaque octagon which can just use a cheap
solid fill and an outer AA octagon within which we need to actually we do
AA and outside which we can just do another solid clear. This reduces most
of the cost of rounded-rectangles to just some setup work, a few fragments
of distance AA on the ends of a span, and large runs of solid color where
we don't have to do much work.

Differential Revision: https://phabricator.services.mozilla.com/D106658

2021-05-22T18:08:46.227000: DEBUG : Did not find a branch, checking all integration branches
2021-05-22T18:08:46.242000: INFO : The bisection is done.
2021-05-22T18:08:46.242000: INFO : Stopped

Comment 2

[Mayank Bansal]

Attachment: bug.png

Comment 3

[Mayank Bansal]

Attachment: testcase.html

reduced testcase

Comment 4

[Mayank Bansal]

there is the artifact as soon as the rotation degree becomes >90deg