I have a rather odd regression betweeen alpha07 and alpha11

Question

I have a rather odd regression betweeen alpha07 and alpha11 I had followed some instructions on how to integrate with CameraView from CameraX using an AndroidView and specifically I had implemented a preview use case and had scaled the CameraView into a small thumbnail just as a view finder for what the camera was looking at This worked fine in alpha07 but in alpha11 it looks like the surface is being cropped instead of scaled as I was expecting It d take me a bit to make a minimal reproduction case and will in the thread if required Any ideas from the compose authors here on why a SurfaceView would be clipped now instead of scaled as before

Neal Sanche · Answer

Alright I spent a bit of time to make a minimal example app and put the code up on Github <https github com nealsanche ComposeCameraPreview> there are two commits one that targets alpha08 and one that targets alpha11 of Compose In the alpha11 version the camera preview always starts out unscaled as if the surface is being actually drawn full screen but is clipped Flipping the switch on the app toggles between front and back cameras and after toggling the preview looks correct On alpha08 the preview always looks fine even at startup

Neal Sanche · Answer

This is an example of what I d expect to see the camera preview fits inside the thumbnail

Neal Sanche · Answer

And here is what the initial layout looks like on alpha11 The preview is cropped instead of being scaled as I would expect

Adam Powell · Answer

hmm Can you file a bug on the compose issue tracker linking to that repo We may not get to investigating it in the next week or so but it looks like something worth tracking if it s still giving you trouble

fmasa · Answer

< Neal Sanche> Would you mind sharing the link to bug report if you get the time to report it slightly smiling face

fmasa · Answer

< Neal Sanche> Also you can force use of TextureView instead of SurfaceView as workaround This seems to work correctly ```view implementationMode = PreviewView ImplementationMode COMPATIBLE```

Neal Sanche · Answer

Will do < Adam Powell>

Neal Sanche · Answer

< fmasa> Nice I ll try the workaround It ll probably be fine Will still post a bug report though and put the link here

Neal Sanche · Answer

Issue <https issuetracker google com issues 179291080>

fmasa · Answer

I just now noticed that the preview in my case at least is not really cropped but rather scaled and then shrunk

Ilias Zosimadis · Answer

Hi < Neal Sanche> did you find a solution for this issue I think I have the same issue but using the CameraX and AndroidViewBinding I also found that this issue is somehow related to the android coroutine lib

Neal Sanche · Answer

Nothing so far Ilias I was going to go back and try the above workaround to see if it works for Compose but I haven t yet

Ilias Zosimadis · Answer

TextureView fixed the issue for me Working with Camera X in compose brings many issues especially for older devices

Neal Sanche · Answer

I also can confirm that using TextureView using the workaround above definitely works for my little app Thanks < fmasa>

Ahmet Delibaş · Answer

This problem happened to me also and workaround solution is also worked for me I hope it will be handled Thank you so much < fmasa>