User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/112.0

Steps to reproduce:

Applied the stylesheet "transform: rotate(180deg)" to the video.

Actual results:

When I apply the stylesheet "transform:rotate(180deg)" to the video, the video is not displayed.

Expected results:

The video should be displayed. It displays correctly in Google Chrome.

The Bugbug bot thinks this bug should belong to the 'Core::Graphics: WebRender' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Regression :
Bug 1753373 - Upload software decoded video to NV12 for video overlay on Windows r=alwu,gfx-reviewers,bradwerth

If you set media.wmf.use-nv12-format = False OR
gfx.webrender.dcomp-video-sw-overlay-win = False,
then the bug gets fixed.

It seemed that video overlay has the problem even before Bug 1816026.

Current native compositor does not support Rotate 90 deg nor Rotate 270 deg. It supports only Rotate 0 deg and Rotate 180 deg.
Rotate 90 deg and Rotate 270 deg were rejected at transform.is_2d_scale_translation() check in can_promote_to_surface().

With the patch, video of transform:rotate(180deg) was shown in a different place without rotation. It seemed that DCompVisual seemed not handle negative scaling.

With Rotate 180 deg, aTransform of DCLayerTree::AddSurface() has negative scaling. The negative scaling seemed not work with video overlay(video SwapChain's visual).

https://hg.mozilla.org/mozilla-central/rev/d014625bd4b6

The patch landed in nightly and beta is affected.
:sotaro, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
• If no, please set status-firefox114 to wontfix.

For more information, please visit BugBot documentation.

Comment on attachment 9333009 [details]
Bug 1831820 - Do not use external compositor surface with negative scaling when compositor does not support the negative scaling

Beta/Release Uplift Approval Request

• User impact if declined: Video cannot be rotated 180 degrees when video overlay is used.
• Is this code covered by automated tests?: Yes
• Has the fix been verified in Nightly?: Yes
• Needs manual test from QE?: No
• If yes, steps to reproduce:
• List of other uplifts needed: none
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): The change just disables video overlay when an external compositor surface needs to have negative scaling.
• String changes made/needed: none
• Is Android affected?: No

Comment on attachment 9333009 [details]
Bug 1831820 - Do not use external compositor surface with negative scaling when compositor does not support the negative scaling

Approved for 114 beta 5, thanks.

https://hg.mozilla.org/releases/mozilla-beta/rev/7979b697db68