1606976 - Rendering problem with diagonal lines in clip regions

Status: UNCONFIRMED

(Core :: Graphics, defect, P3)

Description

[Philip Gladstone]

User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:71.0) Gecko/20100101 Firefox/71.0

Steps to reproduce:

Visit https://jsfiddle.net/philipjsg/vpy8otmb/ and observe the red rectangles in the lower right of the screen. You should be using Windows.

Actual results:

You will see that the first two rectangles have a faint line going up and to the right. The upper left and lower right of these rectangles are drawn in two separate calls. The problem is in the overlap area.

Expected results:

The rectangle should be of uniform color. If you use firefox on OSX (or android) or Chrome (anywhere), then the color is uniform.

Comment 1

[Alice0775 White]

I can reproduce the issue on Nightly73.0a1 Windows10 with/without WebRender.
However, I cannot reproduce the issue if HWA is disabled.

Comment 2

[Kris Taeleman (:ktaeleman)]

Checked back to FF 60 and is reproducible there as well.