BlurTest.kt

private val BottomRectangle = GenericShape { size, _ ->
    // 1)
    moveTo(0f, size.height * 0.6f)

    // 2)
    lineTo(size.width, size.height * 0.6f)


    lineTo(size.width, size.height)

    lineTo(0f, size.height)

    // 3)
    lineTo(0f, size.height * 0.6f)
}
/*
@Composable
fun SampleImage() {
    Box(
        modifier = Modifier
            .fillMaxSize()
            .background(Color.Red)
    ) {
        Image(
            painter = painterResource(id = R.drawable.movie_poster),
            contentDescription = "",
            modifier = Modifier
                .fillMaxWidth()
                .height(300.dp),
            contentScale = ContentScale.Crop
        )

        Column(
            modifier = Modifier.blur(
                30.dp,
                edgeTreatment = BlurredEdgeTreatment(BottomRectangle)
            )
        )
        {
            Image(
                painter = painterResource(id = R.drawable.movie_poster),
                contentDescription = "",
                contentScale = ContentScale.Crop,
                modifier = Modifier
                    .fillMaxWidth()
                    .drawWithContent {
                        this.drawContext.canvas.nativeCanvas.
                    }
                    .height(300.dp)
            )
            Box(modifier = Modifier.background(Color.Black).fillMaxWidth().height(100.dp))
            
        }

    }
}*/


fun Modifier.customBlur(
    radiusX: Dp,
    radiusY: Dp,
    edgeTreatment: BlurredEdgeTreatment = BlurredEdgeTreatment.Rectangle,
): Modifier {
    val clip: Boolean
    val tileMode: TileMode
    if (edgeTreatment.shape != null) {
        clip = true
        tileMode = TileMode.Clamp
    } else {
        clip = true
        tileMode = TileMode.Decal
    }
    return if ((radiusX > 0.dp && radiusY > 0.dp) || clip) {
        graphicsLayer {
            val horizontalBlurPixels = radiusX.toPx()
            val verticalBlurPixels = radiusY.toPx()
            this.renderEffect =
                    // Only non-zero blur radii are valid BlurEffect parameters
                if (horizontalBlurPixels > 0f && verticalBlurPixels > 0f) {
                    BlurEffect(horizontalBlurPixels, verticalBlurPixels, tileMode)
                } else {
                    null
                }
            this.shape = edgeTreatment.shape ?: RectangleShape
            this.clip = true
        }
    } else {
        this
    }
}