82 lines
2.3 KiB
C++
82 lines
2.3 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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#ifndef mozilla_PostTraversalTask_h
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#define mozilla_PostTraversalTask_h
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#include "mozilla/AlreadyAddRefed.h"
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/* a task to be performed immediately after a Servo traversal */
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namespace mozilla {
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class ServoStyleSet;
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namespace dom {
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class FontFaceSet;
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class FontFaceSetImpl;
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} // namespace dom
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namespace fontlist {
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struct Family;
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} // namespace fontlist
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} // namespace mozilla
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class gfxUserFontEntry;
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namespace mozilla {
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/**
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* A PostTraversalTask is a task to be performed immediately after a Servo
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* traversal. There are just a few tasks we need to perform, so we use this
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* class rather than Runnables, to avoid virtual calls and some allocations.
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*
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* A PostTraversalTask is only safe to run immediately after the Servo
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* traversal, since it can hold raw pointers to DOM objects.
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*/
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class PostTraversalTask {
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public:
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static PostTraversalTask DispatchLoadingEventAndReplaceReadyPromise(
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already_AddRefed<dom::FontFaceSetImpl> aFontFaceSetImpl) {
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PostTraversalTask task(Type::DispatchLoadingEventAndReplaceReadyPromise);
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task.mTarget = aFontFaceSetImpl.take();
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return task;
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}
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static PostTraversalTask LoadFontEntry(
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already_AddRefed<gfxUserFontEntry> aFontEntry) {
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PostTraversalTask task(Type::LoadFontEntry);
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task.mTarget = aFontEntry.take();
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return task;
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}
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void Run();
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PostTraversalTask(const PostTraversalTask&) = delete;
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PostTraversalTask(PostTraversalTask&& aOther)
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: PostTraversalTask(aOther.mType) {
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mTarget = aOther.mTarget;
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aOther.mTarget = nullptr;
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};
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~PostTraversalTask();
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private:
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enum class Type {
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// mTarget (FontFaceSetImpl*)
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DispatchLoadingEventAndReplaceReadyPromise,
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// mTarget (gfxUserFontEntry*)
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LoadFontEntry,
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};
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explicit PostTraversalTask(Type aType)
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: mType(aType), mTarget(nullptr) {}
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const Type mType;
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// Note that this is a strong reference of the relevant target
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void* mTarget = nullptr;
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};
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} // namespace mozilla
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#endif // mozilla_PostTraversalTask_h
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