// create from bitmap (which should have a mask unless it's monochrome):
// there shouldn't be any implicit bitmap -> icon conversion (i.e. no
// ctors, assignment operators...), but it's ok to have such function
// create from bitmap (which should have a mask unless it's monochrome):
// there shouldn't be any implicit bitmap -> icon conversion (i.e. no
// ctors, assignment operators...), but it's ok to have such function