How to create ImageBitmap by array with points and...

# compose

[PHondogo]

How to create ImageBitmap by array with points and colors?
I have FloatArray every 3 items in it is the point info (x, y, color). Need to make ImageBitmap from it.

[Chris Fillmore]

You can create a Bitmap with such data:
https://developer.android.com/reference/android/graphics/Bitmap#createBitmap(int[],%20int,%20int,%20android.graphics.Bitmap.Config)

Then you can use Bitmap.asImageBitmap()

[Chris Fillmore]

Ah you edited your question and now it is different.

I’m not aware of something that creates a Bitmap from the format of data you have. (But it’s possible such a thing exists.) So I think you need to transform/flatten the data into a format you can pass to createBitmap()

[PHondogo]

Thanks, Chris! I'll tranform it to match arguments of function you suggest.

[Landry Norris]

Be careful how you map it. If it’s anything more than a small icon, that’s not going to be a fast process on the CPU. You may want to look at passing it to C or Kotlin/Native to use the GPU.

[Stylianos Gakis]

I wonder how that could look like? I've never seen it be done, especially by also using K/N

[Landry Norris]

What is the source of the pixel data? Does it come from a library? If you can get it in int form, you could use libswscale or something.

[Chris Fillmore]

There’s no need to pass this to a lower level. If you have hundreds of thousands or millions of pixels, just pass it to a worker thread to process.

[Chris Fillmore]

It’s a static image after all, not animated, or video for example

[Landry Norris]

If that's acceptable in this case, you can do that. It could take a non-negligible time.

[Chris Fillmore]

I’m assuming he doesn’t need the image quickly. Otherwise why would it be provided in this format? (But I might be wrong.)

[eygraber]

I did something like that here - https://github.com/eygraber/compose-color-picker/blob/master/library/src/commonMain/kotlin/com/eygraber/compose/colorpicker/ColorWheel.kt

[PHondogo]

Thanks, friends! The reason for generation bitmap was that when using canvas it invokes onDraw for every change in ui even when non related elements changing. So i decided to generate bitmap manualy in LaunchedEffect and then apply it as Image. I didnt know about Canvas(ImageBitmap) that Eliezer use. Now I'll try his variant.