fadingEdge

Shows the composable via drawContent, but only where the two images overlap according to transparencyGradient, which should be a black to white or white to black gradient.

• graphicsLayer renders the content of this modifier in a separate layer. Using CompositingStrategy.Offscreen ensures that BlendMode.DstIn is applied in an offscreen buffer (that's isolated from other composables) and only then it will be rendered on top, which ensures the transparency is applied

• drawWithContent is used to overlay a rectangle with a transparencyGradient. And with BlendMode.DstIn, it will be used as a visibility mask. Meaning that the drawContent will only be visible in areas where the content and rectangle overlap (which should be a non-transparent color)

• https://developer.android.com/develop/ui/compose/graphics/draw/modifiers#compositing-strategy