layout/style/PreloadedStyleSheet.h
author Nika Layzell <nika@thelayzells.com>
Tue, 25 Sep 2018 17:34:53 +0200
changeset 507828 5e6dae0c1e5a4939ccd406f14607f7fafffd45a7
parent 466509 d52333f705516215969272a02c1dedacb1fa7c4f
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1448426 - Wrap windows.h to avoid problematic define statements, r=froydnj,glandium By default, windows.h exposes a large number of problematic define statements which are UpperCamelCase, such as a define from `CreateWindow` to `CreateWindow{A,W}`. As many of these names are generic (e.g. CreateFile, CreateWindow), they can mess up Gecko code that may legitimately have its own methods with the same names. The header also defines some traditional SCREAMING_SNAKE_CASE defines which can mess up our code by conflicting with local values. This patch adds a simple code generator which generates wrappers for these defines, and uses them to wrap the windows.h wrapper using the `stl_wrappers` mechanism, allowing us to use windows.h in more places. Differential Revision: https://phabricator.services.mozilla.com/D10932

/* -*- 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/. */

/* a CSS style sheet returned from nsIStyleSheetService.preloadSheet */

#ifndef mozilla_PreloadedStyleSheet_h
#define mozilla_PreloadedStyleSheet_h

#include "mozilla/css/SheetParsingMode.h"
#include "mozilla/NotNull.h"
#include "mozilla/Result.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsICSSLoaderObserver.h"
#include "nsIPreloadedStyleSheet.h"

class nsIURI;

namespace mozilla {
namespace dom {
  class Promise;
}

class StyleSheet;

class PreloadedStyleSheet : public nsIPreloadedStyleSheet
{
public:
  // *aResult is addrefed.
  static nsresult Create(nsIURI* aURI, css::SheetParsingMode aParsingMode,
                         PreloadedStyleSheet** aResult);

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS(PreloadedStyleSheet)

  // *aResult is not addrefed, since the PreloadedStyleSheet holds a strong
  // reference to the sheet.
  nsresult GetSheet(StyleSheet** aResult);

  nsresult Preload();
  nsresult PreloadAsync(NotNull<dom::Promise*> aPromise);

protected:
  virtual ~PreloadedStyleSheet() {}

private:
  PreloadedStyleSheet(nsIURI* aURI, css::SheetParsingMode aParsingMode);

  class StylesheetPreloadObserver final : public nsICSSLoaderObserver
  {
  public:
    NS_DECL_ISUPPORTS

    explicit StylesheetPreloadObserver(NotNull<dom::Promise*> aPromise,
                                       PreloadedStyleSheet* aSheet)
      : mPromise(aPromise)
      , mPreloadedSheet(aSheet)
    {}

    NS_IMETHOD StyleSheetLoaded(StyleSheet* aSheet,
                                bool aWasAlternate,
                                nsresult aStatus) override;

  protected:
    virtual ~StylesheetPreloadObserver() {}

  private:
    RefPtr<dom::Promise> mPromise;
    RefPtr<PreloadedStyleSheet> mPreloadedSheet;
  };

  RefPtr<StyleSheet> mSheet;

  bool mLoaded;
  nsCOMPtr<nsIURI> mURI;
  css::SheetParsingMode mParsingMode;
};

} // namespace mozilla

#endif // mozilla_PreloadedStyleSheet_h