gecko-dev/layout/style/ServoTypes.h

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1.5 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_ServoTypes_h
#define mozilla_ServoTypes_h
/*
* Type definitions used to interact with Servo. This gets included by nsINode,
* so don't add significant include dependencies to this file.
*/
struct ServoNodeData;
namespace mozilla {
/*
* Replaced types. These get mapped to associated Servo types in bindgen.
*/
template<typename T>
struct ServoUnsafeCell {
T value;
// Ensure that primitive types (i.e. pointers) get zero-initialized.
ServoUnsafeCell() : value() {};
};
template<typename T>
struct ServoCell {
ServoUnsafeCell<T> value;
T Get() const { return value.value; }
void Set(T arg) { value.value = arg; }
ServoCell() : value() {};
};
// Indicates whether the Servo style system should expect the style on an element
// to have already been resolved (i.e. via a parallel traversal), or whether it
// may be lazily computed.
enum class LazyComputeBehavior {
Allow,
Assert,
};
// Indicates whether the Servo style system should perform normal processing or
// whether it should only process unstyled children of the root and their
// descendants.
enum class TraversalRootBehavior {
Normal,
UnstyledChildrenOnly,
};
} // namespace mozilla
#endif // mozilla_ServoTypes_h