layout/style/PostTraversalTask.h
author Xianzhu Wang <wangxianzhu@chromium.org>
Tue, 05 Mar 2019 12:18:01 +0000
changeset 464575 4325ba7b38576495a78289c2a8f4dff391922e66
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
child 471754 095b3edec3c8ba9318c71d0acc91e10ce57818dc
permissions -rw-r--r--
Bug 1529059 [wpt PR 15420] - [BlinkGenPropertyTrees] Initiailize double_sided of synthetic effect, a=testonly Automatic update from web-platform-tests [BlinkGenPropertyTrees] Initiailize double_sided of synthetic effect Previously synthetic effects always had double_sided==false, causing the layer disappear when the backface was facing forward. Bug: 928190 Change-Id: I35534b40346d5c5918bc99c00a4ca6b4e3b68796 Reviewed-on: https://chromium-review.googlesource.com/c/1475815 Reviewed-by: Philip Rogers <pdr@chromium.org> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org> Cr-Commit-Position: refs/heads/master@{#632764} -- wpt-commits: a89467050deaf1dcbd9140a2f0670b1b85e518ee wpt-pr: 15420

/* -*- 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_PostTraversalTask_h
#define mozilla_PostTraversalTask_h

#include "nscore.h"

/* a task to be performed immediately after a Servo traversal */

namespace mozilla {
namespace dom {
class FontFace;
class FontFaceSet;
}  // namespace dom
}  // namespace mozilla
class gfxUserFontEntry;

namespace mozilla {

/**
 * A PostTraversalTask is a task to be performed immediately after a Servo
 * traversal.  There are just a few tasks we need to perform, so we use this
 * class rather than Runnables, to avoid virtual calls and some allocations.
 *
 * A PostTraversalTask is only safe to run immediately after the Servo
 * traversal, since it can hold raw pointers to DOM objects.
 */
class PostTraversalTask {
 public:
  static PostTraversalTask ResolveFontFaceLoadedPromise(
      dom::FontFace* aFontFace) {
    auto task = PostTraversalTask(Type::ResolveFontFaceLoadedPromise);
    task.mTarget = aFontFace;
    return task;
  }

  static PostTraversalTask RejectFontFaceLoadedPromise(dom::FontFace* aFontFace,
                                                       nsresult aResult) {
    auto task = PostTraversalTask(Type::ResolveFontFaceLoadedPromise);
    task.mTarget = aFontFace;
    task.mResult = aResult;
    return task;
  }

  static PostTraversalTask DispatchLoadingEventAndReplaceReadyPromise(
      dom::FontFaceSet* aFontFaceSet) {
    auto task =
        PostTraversalTask(Type::DispatchLoadingEventAndReplaceReadyPromise);
    task.mTarget = aFontFaceSet;
    return task;
  }

  static PostTraversalTask DispatchFontFaceSetCheckLoadingFinishedAfterDelay(
      dom::FontFaceSet* aFontFaceSet) {
    auto task = PostTraversalTask(
        Type::DispatchFontFaceSetCheckLoadingFinishedAfterDelay);
    task.mTarget = aFontFaceSet;
    return task;
  }

  static PostTraversalTask LoadFontEntry(gfxUserFontEntry* aFontEntry) {
    auto task = PostTraversalTask(Type::LoadFontEntry);
    task.mTarget = aFontEntry;
    return task;
  }

  void Run();

 private:
  // For any new raw pointer type that we need to store in a PostTraversalTask,
  // please add an assertion that class' destructor that we are not in a Servo
  // traversal, to protect against the possibility of having dangling pointers.
  enum class Type {
    // mTarget (FontFace*)
    ResolveFontFaceLoadedPromise,

    // mTarget (FontFace*)
    // mResult
    RejectFontFaceLoadedPromise,

    // mTarget (FontFaceSet*)
    DispatchLoadingEventAndReplaceReadyPromise,

    // mTarget (FontFaceSet*)
    DispatchFontFaceSetCheckLoadingFinishedAfterDelay,

    // mTarget (gfxUserFontEntry*)
    LoadFontEntry,
  };

  explicit PostTraversalTask(Type aType)
      : mType(aType), mTarget(nullptr), mResult(NS_OK) {}

  Type mType;
  void* mTarget;
  nsresult mResult;
};

}  // namespace mozilla

#endif  // mozilla_PostTraversalTask_h