Ability to use Bitmap instead of ImageBitmap

[sosauce]

Hello !

So I've found out that using .asImageBitmap() to convert Bitmap to ImageBitmap kinda slow making the theme switch 3 seconds after image change compared to instant when using Google's Palette API which takes in a Bitmap.

Could it be possible to directly Bitmaps ?

Thanks in advance ^^

[jordond]

Which function are you using? The androidx Palette API does things differently, and is probably faster than the implementation in MCU.

[sosauce]

class ThemeProcessingViewModel: ViewModel() {


    var palette by mutableStateOf<Palette?>(null)
    var dominantColor by mutableStateOf(Color.Black)

    private fun createPaletteAsync(bitmap: Bitmap) {
        Palette.from(bitmap).generate { generatedPalette ->
             palette = generatedPalette
        }
    }


    fun calculateSeedColor(bitmap: ImageBitmap) {
        val suitableColors = bitmap.themeColors(fallback = Color.Black)
        dominantColor = suitableColors.first()
    }

    fun urlToBitmap(
        imageUri: Uri?,
        context: Context,
    ) {
        viewModelScope.launch(Dispatchers.IO) {
            val loader = ImageLoader(context)
            val request = ImageRequest.Builder(context)
                .data(imageUri)
                .allowHardware(false) // If set to true it will not work ???
                .build()
            val result = loader.execute(request)
            if (result is SuccessResult) {
                createPaletteAsync((result.image as BitmapImage).bitmap)
                // Note: When MaterialKolor supports Bitmap or is faster use it and remove Palette dependency
                // calculateSeedColor((result.image as BitmapImage).bitmap.asImageBitmap())
            } else if (result is ErrorResult) {
                cancel(result.throwable.localizedMessage ?: "CuteError", result.throwable)
            }
        }
    }
}

Here's my full ViewModel, as commented, creating a Palette from a bitmap is instantaneous compared to generating a seed color. I may have led to un-necessary confusion, as it may be the process of generating a seed color that is slow as opposed to converting to an ImageBitmap

[jordond]

Yeah so ImageBitmap.themeColors() is relatively slow. It is a direct copy from the material-color-utilities.

For a better/faster approach you can use my KMP port of android.palette: [kmpalette](https://github.com/jordond/kmpalette]. But I will warn you, it's in the process of being updated as it's been awhile since I've given it some love. It currently doesn't have WASM support if you need that, but I'm working on implementing it.

[sosauce]

Thanks ! I'll wait for an update, my endgoal is achieved and works correctly so it's not a rush ^^