SaturateModifier.kt

fun Modifier.saturate(saturation: Float): Modifier =
    drawWithCache {
        // Cache the paint object so it can be reused between draw calls.
        val contentPaint = Paint().apply {
            colorFilter = ColorFilter.saturate(saturation)
        }

        onDrawWithContent {
            drawIntoCanvas {
                it.saveLayer(Rect(Offset.Zero, size), contentPaint)
                drawContent()
                it.restore()
            }
        }
    }

fun ColorFilter.Companion.saturate(s: Float): ColorFilter {
    val saturationMatrix = floatArrayOf(
        .213f + .787f * s, .715f - .715f * s, .072f - .072f * s, 0f, 0f,
        .213f - .213f * s, .715f + .285f * s, .072f - .072f * s, 0f, 0f,
        .213f - .213f * s, .715f - .715f * s, .072f + .928f * s, 0f, 0f,
        0f, 0f, 0f, 1f, 0f,
    )
    return colorMatrix(ColorMatrix(saturationMatrix))
}