Is there anyone having this issue with desktop ? Random rectangles show up on the screen when I draw on canvas. I can't reproduce it, it just happens randomly when I draw (It's a drawing app)

I have never seen that before although I have published a desktop app on all three platforms which heavily uses the canvas.

The project is an interactive drawing app, the user can draw paths, shapes... it happens when I draw some shapes

I’d first check under which circumstances this happens and on which OS/machine combinations. Maybe it’s a hardware or graphis driver problem.

It happens on two windows machines, it's not happening in macOs

Can you please create a minimal reproducible sample on GitHub ?

@mohamed rejeb Looking at the sporadic nature of these glitches, they might indeed be related to the glitches that I see in my PDF tests. The only difference is that I see them on my Mac and you say that you don’t see your glitches on your Mac. What kind of Mac do you have. Intel or ARM? I am still on Intel. (See https://kotlinlang.slack.com/archives/C01D6HTPATV/p1695395804181519 )

I'm using Mac M1 not intel, maybe it's something related to skikoX64 ? I'm trying to create a minimal reproducible, AFAIK this happens when I draw a lot of complex paths in a short period of time also those glitches (the rectangles) keeps moving from place to another with every recomposition

Same for me. If I force redraws in quick succession I see more glitches than otherwise. But this may also just be a matter of statistics. Something else I observed is that I do not see such glitches if I first draw into an image and then draw the image onto a canvas. Something like:

val composeImage = ImageBitmap(width, height)
val canvas = Canvas(composeImage)

draw graphics into that canvas and then

onDrawBehind {
	drawImage(composeImage, offset)
}

That's good, I'll try it, for me it's a drawing app if this workaround is going to slow down the drawing process, I can't use it. Also, now I'm trying to run only on release mode to see if it solves the problem. Is it happening for you with release mode?

Release or not doesn’t make a difference for me. If I just force redraws long enough I also see hard crashes of the JVM in the Skiko lib like this:

# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x000000016e2efd98, pid=4571, tid=86275
#
# JRE version: OpenJDK Runtime Environment Temurin-17.0.8+7 (17.0.8+7) (build 17.0.8+7)
# Java VM: OpenJDK 64-Bit Server VM Temurin-17.0.8+7 (17.0.8+7, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, bsd-amd64)
# Problematic frame:
# C  [libskiko-macos-x64.dylib+0x1aad98]  void SkRecorder::append<SkRecords::DrawPath, SkPaint const&, SkPath const&>(SkPaint const&, SkPath const&)+0x98