StrictMode DiskReadViolation when loading image File from disk

[gajicm93]

Describe the bug
I load an image "file://" Uri from disk. Coil obviously loads it on main thread, or at least does an "last modified time" check on main thread. I even tried specifying IO dispatcher with imageView.load(fileUri) { dispatcher(Dispatchers.IO) } but it doesn't help.

Expected behavior
Expected behaviour is that disk should never be touched from main thread.

To Reproduce
imageView.load(fileUri) where file Uri is a literal "file://" Uri.

Logs/Screenshots

2020-05-02 22:04:02.901 27160-27160/com.berry4u.app D/StrictMode: StrictMode policy violation; ~duration=5 ms: android.os.strictmode.DiskReadViolation
        at android.os.StrictMode$AndroidBlockGuardPolicy.onReadFromDisk(StrictMode.java:1556)
        at java.io.UnixFileSystem.getLastModifiedTime(UnixFileSystem.java:289)
        at java.io.File.lastModified(File.java:939)
        at coil.fetch.FileFetcher.key(FileFetcher.kt:14)
        at coil.fetch.FileFetcher.key(FileFetcher.kt:12)
        at coil.RealImageLoader$executeInternal$2$deferred$1.invokeSuspend(RealImageLoader.kt:525)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
        at kotlinx.coroutines.EventLoop.processUnconfinedEvent(EventLoop.common.kt:69)
        at kotlinx.coroutines.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuation.kt:337)
        at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:26)
        at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:109)
        at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:158)
        at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:54)
        at kotlinx.coroutines.BuildersKt.launch(Unknown Source:1)
        at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:47)
        at kotlinx.coroutines.BuildersKt.launch$default(Unknown Source:1)
        at coil.RealImageLoader.execute(RealImageLoader.kt:143)

Version
0.10.1

[colinrtwhite]

Added an option to disable adding the file's last modified timestamp here, which will roll out in the next release.

[gajicm93]

This is kind of a workaround solution.. Couldn't you just move reading lastModified param to a background thread?

[colinrtwhite]

Coil synchronously fulfills images in the memory cache (to avoid white flashes) so it's not possible to move the check to a background thread.

[micHar]

@colinrtwhite the link you provided as a workaround leads to 404. Can you update pls?

[PaulWoitaschek]

Is there really no other way? If you have a grid of images, 5ms blocking of the main thread for each image causes jank. That's not a good default setting.

[PaulWoitaschek]

@micHar

Here is an example how to deactivate it:
PaulWoitaschek/Voice@03096be