Load image from disk in kotlin multiplatform

Question

I have simple kotlin multiplatform project. And I want to display some PNG from my disk. How can I do that? For example, my image is located in "D:\sample_image.png". I do not want to use resources at all.

Using painter = painterResource("D:\sample_image.png") does not work as this is not the resource.

FileResourceLoader is not available since it's Compose Desktop thingy.

Please note that I'm using Kotlin Multiplatform, and I need universal solution.

Any help is appreciated, thanks!

Answer 1

OK, so I resolved it... kinda.

CommonMain:

expect fun createBitmapFromFile(filepath: String): ImageBitmap?

jvmMain:

actual fun createBitmapFromFile(filepath: String): ImageBitmap? {
    val file = File(filepath)
    return if (file.exists()) {
        val inputStream = file.inputStream()
        return loadImageBitmap(inputStream)
    } else {
        null
    }
}

iosMain: AI generated, and I don't have option to test it. If anyone is kind enough to try it out and confirm it works, I would really appreciate it.

actual fun createBitmapFromFile(filePath: String): ImageBitmap? {
    val fileURL = NSURL.fileURLWithPath(filePath)
    val imageData = NSData.dataWithContentsOfURL(fileURL)
    val uiImage = UIImage.imageWithData(imageData)

    return if (uiImage != null) {
        return uiImage.toBitmap()
    } else {
        null
    }
}

private fun UIImage.toBitmap(): ImageBitmap {
    val cgImage = this.CGImage
    val data = cgImage.dataProvider?.data
    val bytes = data?.readBytes()?.toUByteArray()
    return Image.makeFromEncoded(bytes).asImageBitmap()
}