Bug 278938 – Canvas Context DrawImage() fails with tall videos on some CPU/GPUs

• Status: NEW
• Component: Canvas

[Michael Diehr]

This seems like a long-standing issue, I first reported it back under Safari 15 under macOS Monterey 12 and Feedback Assistant case FB FB10024126
It persists in Safari 17 and macOS 14, as well as Safari Technology Preview (202).

Some videos fail to draw anything when Canvas Context DrawImage(video) is called. 

Seems to affect particularly videos that are taller than wide, and may often happen more often with videos from LivePhotos.

Steps to reproduce:

Open this web page and click the play button:
 https://xochi.com/xojo/canvas/index.html

[Michael Diehr]

Regression testing reveals some complexity to the issue, as behavior differs depending on the GPU and OS in use, affecting mostly Intel MacBook Pros with both AMD, Intel, and NVIDIA GPUs.

Details:

Bug?   OS            Safari  GPU
------------------------------------------------
Yes*   Intel 10.14   14.1    Intel HD Graphics 4000
No     Intel 10.14   14.1    GeForce GT 650M

Yes    Intel 10.15   15.6    Intel HD Graphics 4000
Yes    Intel 10.15   15.6    GeForce GT 650M

Yes    Intel 12.4    15.5    Radeon Pro Vega 20   

Yes    Intel 14.6.1  17.6    Radeon Pro Vega 20   
Yes    Intel 14.6.1  P202    Radeon Pro Vega 20   
Yes    Intel 14.6.1  17.6    Intel UHD 630

No     M1    12.6   16.0    M1
No     M1    12.7.6 17.6    M1

No     M1    13.6.1 17.1    M1
No     M1    13.6.9 17.6    M1

No     M1    15.1   18.1    M1



Notes:

P202 = Safari Technical Preview build 202

Yes* = On this machine, the bug is reversed. when using the iGPU: video fails to play, but the canvas screenshots do work.  With the dGPU in use, it behaves normally.

[Alexey Proskuryakov]

Thank you, relating to your Feedback Assistant report, and adding some experts.

rdar://93708285

[Kimmo Kinnunen]

I can repro on iMac1,1.

Likely on intel we get some sort of CVPixelBuffer that we don't treat correctly with GPUP due to it having multiple code paths.

Need to investigate.