"Can't wrap nullptr" thrown from within skiko in compose jvm desktop test when using dialogs

[ZacSweers]

Repro: slackhq/circuit#1121

Version: 1.9.0-alpha-4

File: circuitx/overlays/src/jvmTest/kotlin/com/slack/circuitx/overlays/OverlaySnapshotTests.kt

Trace:

java.lang.RuntimeException: Can't wrap nullptr
	at org.jetbrains.skia.impl.Native.<init>(Native.jvm.kt:40)
	at org.jetbrains.skia.impl.Managed.<init>(Managed.jvm.kt:12)
	at org.jetbrains.skia.impl.RefCnt.<init>(RefCnt.jvm.kt:6)
	at org.jetbrains.skia.Image.<init>(Image.kt:6)
	at org.jetbrains.skia.Surface.makeImageSnapshot(Surface.kt:762)
	at androidx.compose.ui.test.SkikoComposeUiTest.captureToImage(ComposeUiTest.skikoMain.kt:343)
	at androidx.compose.ui.test.SkikoComposeUiTest.captureToImage(ComposeUiTest.skikoMain.kt:348)
	at io.github.takahirom.roborazzi.RoborazziDesktopKt.captureRoboImage(RoborazziDesktop.kt:39)
	at io.github.takahirom.roborazzi.RoborazziDesktopKt.captureRoboImage(RoborazziDesktop.kt:23)
	at io.github.takahirom.roborazzi.RoborazziDesktopKt.captureRoboImage$default(RoborazziDesktop.kt:16)
	at com.slack.circuitx.overlays.OverlaySnapshotTests$alertDialog$1.invoke(OverlaySnapshotTests.kt:62)
	at com.slack.circuitx.overlays.OverlaySnapshotTests$alertDialog$1.invoke(OverlaySnapshotTests.kt:34)
	at androidx.compose.ui.test.SkikoComposeUiTest.runTest(ComposeUiTest.skikoMain.kt:170)
	at androidx.compose.ui.test.ComposeUiTest_desktopKt.runDesktopComposeUiTest(ComposeUiTest.desktop.kt:41)
	at androidx.compose.ui.test.ComposeUiTest_desktopKt.runDesktopComposeUiTest$default(ComposeUiTest.desktop.kt:34)
	at com.slack.circuitx.overlays.OverlaySnapshotTests.alertDialog(OverlaySnapshotTests.kt:34)

[takahirom]

I've seen this before. It might be because you're using the window. Could you try using an inner Composable function instead? However, this may not be what you're looking for.

[ZacSweers]

Can you clarify what you mean by "inner composable function"?

[takahirom]

The inner composable function refers to taking a screenshot of the Composable function's content inside a dialog. However, I understand that this may not be what you, as the creator of a dialog display library, are looking for. When I tried it before, it was challenging to capture content from outside a Window on Desktop, so this issue might not be resolved quickly. It might be addressed as soon as a way is found to capture images per window or to effectively combine them per window.