cairo/pattern.go
func NewPatternFromRGBA(red, green, blue, alpha float64) (*Pattern, error) {
	c := C.cairo_pattern_create_rgba(C.double(red), C.double(green), C.double(blue), C.double(alpha))
	return newPatternFromNative(c)
}
func NewPatternFromRGBA(red, green, blue, alpha float64) (*Pattern, error) {
	c := C.cairo_pattern_create_rgba(C.double(red), C.double(green), C.double(blue), C.double(alpha))
	return newPatternFromNative(c)
}
// NewPatternFromRGBA is a wrapper around cairo_pattern_create_rgba().