A transparent to white `Brush.verticalGradient` in a white `Box` renders gray with `drawWithCache` ....

# compose

[adjpd]

A transparent to white Brush.verticalGradient in a white Box renders gray with drawWithCache . A bug? Code in 🧵

[adjpd]

Box(
  Modifier
    .size(50.dp, 50.dp)
    .background(Color.White)
    .drawWithCache {
      onDrawWithContent {
        drawContent()
        drawRect(
          Brush.verticalGradient(
            .5f to Color.Transparent,
            1F to Color.White
          )
        )
      }
    }
)

[Zach Klippenstein (he/him) [MOD]]

I'm not at a computer atm but i think transparent might set the other color channels to zero, and so it ends up interpolating between transparent black and opaque white which gives you the gray?

[Zach Klippenstein (he/him) [MOD]]

You could try doing Color.White.copy(alpha=0f) instead of Transparent

[adjpd]

That's fantastic, Zach. Thank you. Should I report that as a bug? The gray gradient seems rather strange seeing as Color.Transparent was set.

[Zach Klippenstein (he/him) [MOD]]

I don't think it's worth filing a bug, I think you just have to be careful when lerping colors that if you only want to lerp the alpha channel, you make sure that's the only channel that's different.