Hey folks! I have a multiplatform project that shares some business code between Android and iOS pla...

# compose

[dzaitsev]

Hey folks! I have a multiplatform project that shares some business code between Android and iOS platforms. I have recently started migrating some views from android to compose multiplatform and have encountered this problem.
One of the views used ImageBitmap to draw a png image on the canvas, and I can't find a method in mpp to create an object of this type from a resource.
Any advice and help would be appreciated.

[Michael Paus]

Did you have a look here: https://github.com/JetBrains/compose-multiplatform/tree/master/tutorials/Image_And_Icons_Manipulations ?

[dzaitsev]

Yes, of course. There's an example with the java.io API, but I need a multi-platform solution that will work for Android and iOS at the same time.
Do I understand correctly that out of the box there is no such solution and I need to use the expect/actual approach?

[Michael Paus]

What exactly is your problem?

painter = painterResource("sample.png")

The above code gives you a painter and you can directly draw that into a DrawScope without having to use any platform dependent API.

[dzaitsev]

My problem is that DrawScope allows to draw `ImageBitmap`s not `Painter`s returned from painterResource.
I can't just create an instance of Painter and draw it on Canvas. The canvas API requires ImageBitmap. And I can't find a method in mp that can create that ImageBitmap from the file path like imageBitmap("sample.png) or so.

[dzaitsev]

Solved.
resource("image.png).rememberImageBitmap().orEmpty()

[Michael Paus]

You can draw a painter directly onto a canvas. Here is the code.

import androidx.compose.foundation.Canvas
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.painterResource

@Composable
fun TestPainterOnCanvas(modifier: Modifier = Modifier) {
    val painter = painterResource("image.png")
    Canvas(modifier) {
        with(painter) { draw(intrinsicSize) }
    }
}

[dzaitsev]

Thanks @Michael Paus I'll give it a try