Hello, does anyone know why I get this error when I try building my project? The imports work in the...

# compose-desktop

[Dragos Rachieru]

Hello, does anyone know why I get this error when I try building my project?
The imports work in the editor and I can run the code when using compose for desktop, but android fails to build:

[Dragos Rachieru]

I was using 1.2.0-alpha01-dev683, I'll try updating to 686 right now

[Dragos Rachieru]

Same errors, here's my versions file:

object Versions {
    //not used yet
//    const val serialization = "1.3.3"

    const val coroutines = "1.6.2"
    const val ktor = "2.0.2"
    const val okio = "3.1.0"

    const val kotlin = "1.6.21"
    const val compose = "1.2.0-alpha01-dev683"

    const val app = "0.0.1"
}

[Igor Demin]

org.jetbrains.skia package is available only in desktopMain sourceSet

[Dragos Rachieru]

Hmm, how should I convert an image from `ByteArray`(coming from a png like for example) to an ImageBitmap?

[Dragos Rachieru]

I'm trying to create a multiplatform image loading library and I don't know how to support all platforms and cache the images

[Igor Demin]

Hmm, how should I convert an image from `ByteArray`(coming from a png like for example) to an ImageBitmap?

Create an expect/actual function.

BitmapDecoder.kt in commonMain:

expect fun ImageBitmap(bytes: ByteArray): ImageBitmap

BitmapDecoderDesktop.kt in desktopMain:

actual fun ImageBitmap(bytes: ByteArray): ImageBitmap {
    // your code from the screenshot
}

BitmapDecoderAndroid.kt in androidMain:

actual fun ImageBitmap(bytes: ByteArray): ImageBitmap {
    return BitmapFactory.decodeByteArray(bytes, 0, bytes.length).asImageBitmap()
}

[Dragos Rachieru]

Is there something similar available for `ios`/`js`?

[Igor Demin]

The code for them should be the same as for desktop. They are built from the same sourceSet, which depends on Skiko library (Kotlin Skia bindings). Android depends on the native Android API, so the difference.

In the future we can probably publish skikoMain sourceSet, so it is only needed to define your function twice, not 4 times.

[Dragos Rachieru]

Cool, I'll try that, thank you!

[Lucas]

Funilly enough, i was also starting a lib for that just now.
There is already https://github.com/alialbaali/Kamel but it doesnt seem to be mantained anymore and doesnt support JS

[Lucas]

By the way @Igor Demin, the IDE thinks org.jetbrains.skia is available on the common source set, and lets you use it. But as @Dragos Rachieru mentioned, it only compiles for desktop.

[Dragos Rachieru]

@Lucas I was using that and it was no longer maintained, if you want to check my library out, it already works and has a sample for usage

[Dragos Rachieru]

https://github.com/dragossusi/image-loader

[Dragos Rachieru]

Here is the sample:
https://github.com/dragossusi/image-loader/blob/master/sample/src/commonMain/kotlin/ro/dragossusi/ImageSample.kt

[Lucas]

Nice! I think that link is private tho, i cant access it

[Dragos Rachieru]

oh sorry, let me change it

[Dragos Rachieru]

done, should work now

[Lucas]

It works!
Very nice, gonna try it

[Dragos Rachieru]

It's still wip tho, it supports only Url for now