Bug 173410 – [GStreamer] fast/canvas/canvas-createPattern-video-loading.html is failing since r218170

• Component: WebKitGTK
• Status: RESOLVED FIXED

[Miguel Gomez]

fast/canvas/canvas-createPattern-video-loading.html [ Failure ]

[Ms2ger (he/him; ⌚ UTC+1/+2)]

The test fails because drawImageToCanvasAndCheckPixels only find transparent black on the canvas when called from the "playing" callback.

The issue is that MediaPlayerPrivateGStreamerBase::m_sample is set to nullptr in the newly added flushCurrentBuffer() method, called in response to a GST_EVENT_FLUSH_START event. The paint() method then returns early because GST_IS_SAMPLE(m_sample.get()) is false, and the CanvasPattern ends up transparent black.

[Claudio Saavedra]

This started failing recently in Wayland and WPE as well:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fcanvas%2Fcanvas-createPattern-video-modify.html

[Claudio Saavedra]

Ah, sorry. Different test. :/

[Philippe Normand]

(In reply to Ms2ger from comment #1)
> The test fails because drawImageToCanvasAndCheckPixels only find transparent
> black on the canvas when called from the "playing" callback.
> 
> The issue is that MediaPlayerPrivateGStreamerBase::m_sample is set to
> nullptr in the newly added flushCurrentBuffer() method, called in response
> to a GST_EVENT_FLUSH_START event. The paint() method then returns early
> because GST_IS_SAMPLE(m_sample.get()) is false, and the CanvasPattern ends
> up transparent black.

Yes and because no texture copy is done when flushing the sample. The             m_platformLayerProxy->dropCurrentBufferWhilePreservingTexture() call has no effect, because it's done outside of the texturemapper code path.

[Philippe Normand]

Created attachment 425097 [details]
Patch

[EWS]

Committed r275755 (236333@main): <https://commits.webkit.org/236333@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 425097 [details].