IconLayer mask documentation

[am2222]

Hi,
Is there any documentations about how IconColor with mask=true works on Iconlayer? I have an icon which has a border and with mask=false it will not apply the iconColor (which is expected) but once I turn mask=true it applies color to entire icon and removes the border too.
In general I want to see if we can apply icon color to a portion of the png. Does deckgl multiply color to the existing colors in icon?

[Pessimistress]

When an icon has mask:true, it only uses the source image as a transparency mask. More specifically,

color = vec4(instanceColor.rgb, instanceColor.a * textureColor.a * opacity)

You can subclass the IconLayer to apply your own masking logic. example