func EdgeFlagPointer(stride int32, pointer unsafe.Pointer) {
	syscall.Syscall(gpEdgeFlagPointer, 2, uintptr(stride), uintptr(pointer), 0)
}
func EdgeFlagPointer(stride int32, pointer unsafe.Pointer) {
	syscall.Syscall(gpEdgeFlagPointer, 2, uintptr(stride), uintptr(pointer), 0)
}
// define an array of edge flags