c_gsk_outset_shadow_node_new

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GskRenderNode* function(GskRoundedRect* outline, GdkRGBA* color, float dx, float dy, float spread, float blurRadius) c_gsk_outset_shadow_node_new;

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