Hi, happy new year to you all!
In the last days, I was finally able to fix QR code scanning (or barcode scanning in general) on the Replicant side[1]. Out of different apps with scanners that I tested, ZXing works. The scanner view in the Bitcoin Wallet app and in the Rumble app don't work because they rely on some unsupported OpenGL features. But these apps are still usable because the scanned codes can be pasted from the ZXing app. Some barcodes, that are not only black on white and have more colors incorporated, might not work because of the simplified conversion. I expect this to not be a bigger issue. The bigger issue is the slow preview. The camera preview is already slow but it's bearable. The barcode scanner app (ZXing) preview is annoyingly slow. First, I thought this is because of my conversion in the background, but I disabled data forwarding to the app at some point and the preview was almost not noticeable faster. The conversion is also pretty fast: 15ms per frame on the Galaxy S3. My guess is that there is a general regression in the software rendering of SurfaceViews in SurfaceFlinger compared to previous Android versions. It's a lot faster on Replicant 4.2. I removed some of the large preview resolutions[2], but this helps only a little. There was a large refactoring of SurfaceFlinger after Android 4.2, so it's not easy to figure out the changes that might cause this. Some time ago, I tried to do profiling of llvmpipe which was basically a profiling of SurfaceFlinger because llvmpipe gets loaded by SurfaceFlinger. I did this with callgrind and only got garbage output although I tried to set the needed build flags. I could try this again with the Android software renderer. I also could go through some of the tools Google offers for Android. However, most of them seem to be toys for app developers, but I could be wrong. dumpsys SurfaceFlinger also provides some useful output. If anyone can help debugging this or has an idea how this issue could be debugged, then I would be very thankful. Best regards, Wolfgang [1] https://code.fossencdi.org/frameworks_base.git/commit/?h=replicant-6.0&id=a57394a0be5e601c447a07786487bd4c34b0d899 [2] https://code.fossencdi.org/device_samsung_smdk4412-common.git/commit/?h=replicant-6.0&id=058a1cf3e508f85edc50e6914de2a171ad1a9731 -- Website: https://fossencdi.org OpenPGP: 0F30 D1A0 2F73 F70A 6FEE 048E 5816 A24C 1075 7FC4 Key download: https://wiedmeyer.de/keys/ww.asc
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