author Ryan VanderMeulen <ryanvm@gmail.com>
Mon, 05 Jan 2015 13:28:37 -0500
changeset 247913 9e27809d4438e7741d628ad38b385ef19126cd73
parent 236314 41c37790896e424e2743811d3d19be00068ce941
child 257987 a20c7910a82fa2df2f3398c1108d102bac9128b0
permissions -rw-r--r--
Bug 1117757 - Update pdf.js to version 1.0.1040. r=yury, r=Mossop

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsScreenManagerProxy_h
#define nsScreenManagerProxy_h

#include "nsIScreenManager.h"
#include "mozilla/dom/PScreenManagerChild.h"
#include "mozilla/dom/TabChild.h"
#include "ScreenProxy.h"

 * The nsScreenManagerProxy is used by the content process to get
 * information about system screens. It uses the PScreenManager protocol
 * to communicate with a PScreenManagerParent to get this information,
 * and also caches the information it gets back.
 * We cache both the system screen information that nsIScreenManagers
 * provide, as well as the nsIScreens that callers can query for.
 * Both of these caches are invalidated on the next tick of the event
 * loop.
class nsScreenManagerProxy MOZ_FINAL : public nsIScreenManager,
                                       public mozilla::dom::PScreenManagerChild


  ~nsScreenManagerProxy() {};

  bool EnsureCacheIsValid();
  void InvalidateCacheOnNextTick();
  void InvalidateCache();

  uint32_t mNumberOfScreens;
  float mSystemDefaultScale;
  bool mCacheValid;
  bool mCacheWillInvalidate;

  nsRefPtr<mozilla::widget::ScreenProxy> mPrimaryScreen;

  // nsScreenManagerProxy caches the results to repeated calls to
  // ScreenForNativeWidget, which can be triggered indirectly by
  // web content using the DOM Screen API. This allows us to bypass
  // a lot of IPC traffic.
  // The cache stores ScreenProxy's mapped to the TabChild that
  // asked for the ScreenForNativeWidget was called with via
  // ScreenCacheEntry's. The cache is cleared on the next tick of
  // the event loop.
  struct ScreenCacheEntry
    nsRefPtr<mozilla::widget::ScreenProxy> mScreenProxy;
    nsRefPtr<mozilla::dom::TabChild> mTabChild;

  nsTArray<ScreenCacheEntry> mScreenCache;

#endif // nsScreenManagerProxy_h