1842538 - [sw-wr] artifacts on a gradient demo if you resize the window or pinch-zoom

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect)

Description

[Mayank Bansal]

enable sw-wr
Go to https://codepen.io/ericthayer/pen/BwVqXj

either increase the width of the code-panes, or pinch-zoom, or change the width of the browser window

AR: Artifacts

Regression range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=640d8d3f3540386be847160f0e6c959e6e0d5e10&tochange=7ea6d747243265898cd60de1664724fb6e46e811

suspect: bug 1686244

Comment 1

[Mayank Bansal]

Attachment: Standalone_testcase.html

Comment 2

[Mayank Bansal]

Attachment: about:support

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1686244

:lsalzman, since you are the author of the regressor, bug 1686244, could you take a look?

For more information, please visit BugBot documentation.

Comment 4

[Lee Salzman [:lsalzman]]

Attachment: Bug 1842538 - Avoid overflow in linear gradient stepping. r?aosmond

Due to quantization and rounding of the linear gradient deltas, if
the amount of stepping due to long horizontal spans exceeds the precision
of the delta, then this can cause calculations to overflow. To avoid this,
break the stepping up into segments that re-quantize the color every so
often.

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/044dfc94e976
Avoid overflow in linear gradient stepping. r=aosmond

Comment 6

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/044dfc94e976

Comment 7

[Mayank Bansal]

Fixed on Nightly. Thanks!