зеркало из https://github.com/mozilla/gecko-dev.git
92 строки
3.7 KiB
C++
92 строки
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* some utilities for stylo */
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#ifndef mozilla_ServoUtils_h
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#define mozilla_ServoUtils_h
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#include "mozilla/Assertions.h"
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#include "mozilla/TypeTraits.h"
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#include "MainThreadUtils.h"
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namespace mozilla {
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// Defined in ServoBindings.cpp.
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void AssertIsMainThreadOrServoFontMetricsLocked();
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class ServoStyleSet;
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extern ServoStyleSet* sInServoTraversal;
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inline bool IsInServoTraversal()
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{
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// The callers of this function are generally main-thread-only _except_
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// for potentially running during the Servo traversal, in which case they may
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// take special paths that avoid writing to caches and the like. In order
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// to allow those callers to branch efficiently without checking TLS, we
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// maintain this static boolean. However, the danger is that those callers
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// are generally unprepared to deal with non-Servo-but-also-non-main-thread
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// callers, and are likely to take the main-thread codepath if this function
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// returns false. So we assert against other non-main-thread callers here.
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MOZ_ASSERT(sInServoTraversal || NS_IsMainThread());
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return sInServoTraversal;
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}
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} // namespace mozilla
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#define MOZ_DECL_STYLO_CONVERT_METHODS_SERVO(servotype_) \
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inline servotype_* AsServo(); \
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inline const servotype_* AsServo() const; \
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inline servotype_* GetAsServo(); \
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inline const servotype_* GetAsServo() const;
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#define MOZ_DECL_STYLO_CONVERT_METHODS(geckotype_, servotype_) \
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MOZ_DECL_STYLO_CONVERT_METHODS_SERVO(servotype_)
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/**
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* Macro used in a base class of |geckotype_| and |servotype_|.
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* The class should define |StyleBackendType mType;| itself.
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*/
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#define MOZ_DECL_STYLO_METHODS(geckotype_, servotype_) \
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MOZ_DECL_STYLO_CONVERT_METHODS(geckotype_, servotype_)
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#define MOZ_DEFINE_STYLO_METHODS_SERVO(type_, servotype_) \
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servotype_* type_::AsServo() { \
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return static_cast<servotype_*>(this); \
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} \
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const servotype_* type_::AsServo() const { \
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return static_cast<const servotype_*>(this); \
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} \
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servotype_* type_::GetAsServo() { \
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return AsServo(); \
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} \
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const servotype_* type_::GetAsServo() const { \
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return AsServo(); \
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}
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/**
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* Macro used in inline header of class |type_| with its Gecko and Servo
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* subclasses named |geckotype_| and |servotype_| correspondingly for
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* implementing the inline methods defined by MOZ_DECL_STYLO_METHODS.
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*/
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#define MOZ_DEFINE_STYLO_METHODS(type_, geckotype_, servotype_) \
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MOZ_DEFINE_STYLO_METHODS_SERVO(type_, servotype_)
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#define MOZ_STYLO_THIS_TYPE mozilla::RemovePointer<decltype(this)>::Type
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#define MOZ_STYLO_SERVO_TYPE mozilla::RemovePointer<decltype(AsServo())>::Type
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/**
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* Macro used to forward a method call to the concrete method defined by
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* the Servo or Gecko implementation. The class of the method using it
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* should use MOZ_DECL_STYLO_METHODS to define basic stylo methods.
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*/
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#define MOZ_STYLO_FORWARD_CONCRETE(method_, geckoargs_, servoargs_) \
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return AsServo()->method_ servoargs_;
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#define MOZ_STYLO_FORWARD(method_, args_) \
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MOZ_STYLO_FORWARD_CONCRETE(method_, args_, args_)
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#endif // mozilla_ServoUtils_h
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