зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
3.1 KiB
C++
106 строки
3.1 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 "nscore.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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namespace dom {
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class FontFace;
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class FontFaceSet;
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} // namespace dom
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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 ResolveFontFaceLoadedPromise(
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dom::FontFace* aFontFace) {
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auto task = PostTraversalTask(Type::ResolveFontFaceLoadedPromise);
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task.mTarget = aFontFace;
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return task;
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}
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static PostTraversalTask RejectFontFaceLoadedPromise(dom::FontFace* aFontFace,
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nsresult aResult) {
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auto task = PostTraversalTask(Type::ResolveFontFaceLoadedPromise);
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task.mTarget = aFontFace;
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task.mResult = aResult;
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return task;
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}
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static PostTraversalTask DispatchLoadingEventAndReplaceReadyPromise(
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dom::FontFaceSet* aFontFaceSet) {
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auto task =
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PostTraversalTask(Type::DispatchLoadingEventAndReplaceReadyPromise);
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task.mTarget = aFontFaceSet;
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return task;
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}
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static PostTraversalTask DispatchFontFaceSetCheckLoadingFinishedAfterDelay(
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dom::FontFaceSet* aFontFaceSet) {
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auto task = PostTraversalTask(
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Type::DispatchFontFaceSetCheckLoadingFinishedAfterDelay);
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task.mTarget = aFontFaceSet;
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return task;
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}
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static PostTraversalTask LoadFontEntry(gfxUserFontEntry* aFontEntry) {
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auto task = PostTraversalTask(Type::LoadFontEntry);
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task.mTarget = aFontEntry;
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return task;
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}
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void Run();
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private:
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// For any new raw pointer type that we need to store in a PostTraversalTask,
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// please add an assertion that class' destructor that we are not in a Servo
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// traversal, to protect against the possibility of having dangling pointers.
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enum class Type {
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// mTarget (FontFace*)
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ResolveFontFaceLoadedPromise,
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// mTarget (FontFace*)
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// mResult
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RejectFontFaceLoadedPromise,
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// mTarget (FontFaceSet*)
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DispatchLoadingEventAndReplaceReadyPromise,
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// mTarget (FontFaceSet*)
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DispatchFontFaceSetCheckLoadingFinishedAfterDelay,
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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), mResult(NS_OK) {}
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Type mType;
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void* mTarget;
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nsresult mResult;
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};
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} // namespace mozilla
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#endif // mozilla_PostTraversalTask_h
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