I use some SKIA API like `Image.makeFromEncoded()` in my compose code gets a unresolved reference as...

# compose-ios

[Stefan Oltmann]

I use some SKIA API like Image.makeFromEncoded() in my compose code gets a unresolved reference as soon as I add the iosArm64() target. If I try to add api("org.jetbrains.skiko:skiko:0.7.58") to commonMain this results in errors like this:

ld: warning: object file (/var/folders/jw/hb2y762x2jg3y14lzck8_fqc0000gn/T/included15295158996419610357/libparticles.a(libparticles.SkParticleBinding.o)) was built for newer iOS version (11.0) than being linked (9.0)
ld: warning: object file (/var/folders/jw/hb2y762x2jg3y14lzck8_fqc0000gn/T/included15295158996419610357/libskresources.a(libskresources.SkResources.o)) was built for newer iOS version (11.0) than being linked (9.0)
ld: warning: object file (/var/folders/jw/hb2y762x2jg3y14lzck8_fqc0000gn/T/included15295158996419610357/libparticles.a(libparticles.SkParticleDrawable.o)) was built for newer iOS version (11.0) than being linked (9.0)

Is this the wrong way to add skiko? I was thinking SKIA should be already used for Compose for iOS.

I'm on Apple Silicon.

[Oleksandr Karpovich [JB]]

These are warnings. The error message is probably at the bottom.
Could you please check the error message?

[Oleksandr Karpovich [JB]]

compose code gets a unresolved reference as soon as I add the iosArm64() target

Does it fail to compile? Or it’s only in IDE?

[Stefan Oltmann]

The error messages start with:

Undefined symbols for architecture arm64:
  "_CGAffineTransformConcat", referenced from:
      SkScalerContext_Mac::generatePath(SkGlyph const&, SkPath*) in libskia.a(fontmgr_mac_ct.SkScalerContext_mac_ct.o)

and the last line is

ld: symbol(s) not found for architecture arm64

My configuration looks like this:

val xcf = XCFramework()

listOf(
    /* App Store */
    iosArm64(),
    /* Apple Silicon iOS Simulator */
    iosSimulatorArm64(),
    /* macOS Devices */
    macosX64(),
    macosArm64()
).forEach {

    it.binaries.framework(
        buildTypes = setOf(NativeBuildType.RELEASE)
    ) {
        baseName = "compose"
        /* Part of the XCFramework */
        xcf.add(this)
        /* Bitcode was deprecated with XCode 14 */
        embedBitcode("disable")
    }
}

[Stefan Oltmann]

Same error if build from command line without IDEA.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compose:linkReleaseFrameworkIosArm64'.
> Compilation finished with errors

[Stefan Oltmann]

Kotlin/Native on iOS(arm64 and x64)
Kotlin/Native on macOS (arm64 and x64)

Both are listed as supported platforms on the skiko project page. So I assumed it should work.

I'm not sure if the way I specified the dependency is correct.

[Oleksandr Karpovich [JB]]

SkScalerContext_Mac

it’s rather an unexpected symbol for ios.

Did it fail for iosSimulatorArm64 ?

I’m not sure if Image.makeFromEncoded() is the cause. We use it in demos which worked fine.

Do you have a reproducer that could be shared?

[Stefan Oltmann]

Yes, it also fails if I just use iosSimulatorArm64 as a target.

I will try to build a reproducer.

[Michael Paus]

Just in order to help clarifying this issue. This is a code fragment that I use on my Mac for macOS and iOS without having to add any extra dependencies.

import androidx.compose.ui.graphics.ImageBitmap
import androidx.compose.ui.graphics.asComposeImageBitmap
import androidx.compose.ui.graphics.toComposeImageBitmap
import de.mpmediasoft.system.ImageFactoryService
import org.jetbrains.skia.Bitmap
import org.jetbrains.skia.ColorAlphaType
import org.jetbrains.skia.Image
import org.jetbrains.skia.ImageInfo

actual class ImageFactoryServiceImpl actual constructor() : ImageFactoryService {

    // Desktop and UIKit implementation (actually works on all Skia targets)

    override fun imageBitmapFromBytes(encodedImageData: ByteArray): ImageBitmap {
        return Image.makeFromEncoded(encodedImageData).toComposeImageBitmap()
    }

As you can see I directly use the SKIA binding. This works nicely on the simulator (I don’t have a real device) and I am on an Intel Mac but I would assume that this should work on an M1/M2 Mac too.

[Dima Avdeev]

You can't use Image.makeFromEncoded() inside commonMain sourceSet

[Dima Avdeev]

You can use it in iosMain sourceSet

[Dima Avdeev]

There is a related bug in the Kotlin IDE plugin
https://youtrack.jetbrains.com/issue/KT-58107

[Stefan Oltmann]

That may indeed be related to my problem.
I stripped my app down to a minimalistic app for the reproducer and unfortunately that works. So right now I'm investigating what exactly makes it fail for me.

[Michael Paus]

Exactly, that is the reason why I use it in this “actual” class.

[Dima Avdeev]

@Stefan Oltmann
Anyway, minimalistic reproducer will be helpfull

[Dima Avdeev]

You can also look at isStatic = true in gradle.kts

[Stefan Oltmann]

I try to make it fail. Or I will figure out what I did wrong.

[Stefan Oltmann]

I have seen isStatic = true only recently in the examples, but I don't know yet what it does.

[Dima Avdeev]

it means use kotlin libraries as a static Xcode framework

[Dima Avdeev]

It should be set to true right now

[Stefan Oltmann]

Is that the default if I do not specify it?

[Dima Avdeev]

Later we will support dynamyc frameworks as well (isStatic = false by default)

[Dima Avdeev]

By default it is false, so you should set it to true in gradle.kts

[Dima Avdeev]

https://github.com/dima-avdeev-jb/ios-slack-question-pods/blob/44288a289811c32071337c298772ba58ec12705b/shared/build.gradle.kts#L25

[Stefan Oltmann]

That setting indeed makes a difference. My reproducer fails without setting isStatic = true . I missed this configuration as I just copied the old block from my shared module over to my compose module. 🙈 Thank you for pointing that out.

[Stefan Oltmann]

@Michael Paus Thank you. You are right, I don't need extra dependencies.