What library can I use to load images (from a ByteArray, JPEG/PNG/etc) into some common format? scri...

# multiplatform

[martmists]

What library can I use to load images (from a ByteArray, JPEG/PNG/etc) into some common format? scrimage relies on javax.image which doesn't exist on android unfortunately.

[Seri]

Overall, what are you trying to achieve? Coil3 is a more focused library that loads and displays images from a variety of sources and formats. It supports multiplatform, as well. https://coil-kt.github.io/coil/

[Michael Paus]

You don’t need any library for that.

On Android:

fun imageBitmapFromBytes(encodedImageData: ByteArray): ImageBitmap {
	return BitmapFactory.decodeByteArray(encodedImageData, 0, encodedImageData.size).asImageBitmap()
}

On all other platforms:

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

[jw]

I think we made a jump in assumption that this was for Compose UI

[Michael Paus]

Yes, that was my assumption 😉. Is there still anything else?

[jw]

Sure, regular non-UI multiplatform code

[jw]

Skiko can load images, for example.

[jw]

You can also link against things like libpng or whatever formats you want directly, or a library which abstracts them (like ffmpeg).

[Michael Paus]

That’s what I implicitly use in my code above in the non-Android version.

[ephemient]

there's not going to be a good replacement for the full API of scrimage, so the best option will likely depend on what @martmists is trying to do

[martmists]

I'm trying to load images as pixel data for my NDArray implementation, and I haven't found a good way to load a given jpeg in a very portable way. I did see BitmapFactory.decodeByteArray but also a lot of reports that it only worked with PNG images.

[jw]

It works with all formats supported by the OS

[ephemient]

what it supports depends on the OS version but it should support more than PNG

[ephemient]

https://developer.android.com/media/platform/supported-formats#image-formats

[martmists]

I'm currently looking into android.graphics.ImageDecoder which should also support `File`s directly (I believe)

[ephemient]

on Android sure, it's all the same underneath