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68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 nsScreenManagerProxy_h
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#define nsScreenManagerProxy_h
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#include "nsIScreenManager.h"
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#include "mozilla/dom/PScreenManagerChild.h"
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#include "mozilla/dom/TabChild.h"
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#include "ScreenProxy.h"
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/**
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* The nsScreenManagerProxy is used by the content process to get
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* information about system screens. It uses the PScreenManager protocol
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* to communicate with a PScreenManagerParent to get this information,
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* and also caches the information it gets back.
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*
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* We cache both the system screen information that nsIScreenManagers
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* provide, as well as the nsIScreens that callers can query for.
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*
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* Both of these caches are invalidated on the next tick of the event
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* loop.
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*/
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class nsScreenManagerProxy MOZ_FINAL : public nsIScreenManager,
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public mozilla::dom::PScreenManagerChild
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{
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public:
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nsScreenManagerProxy();
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NS_DECL_ISUPPORTS
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NS_DECL_NSISCREENMANAGER
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private:
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~nsScreenManagerProxy() {};
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bool EnsureCacheIsValid();
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void InvalidateCacheOnNextTick();
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void InvalidateCache();
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uint32_t mNumberOfScreens;
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float mSystemDefaultScale;
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bool mCacheValid;
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bool mCacheWillInvalidate;
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nsRefPtr<mozilla::widget::ScreenProxy> mPrimaryScreen;
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// nsScreenManagerProxy caches the results to repeated calls to
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// ScreenForNativeWidget, which can be triggered indirectly by
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// web content using the DOM Screen API. This allows us to bypass
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// a lot of IPC traffic.
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//
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// The cache stores ScreenProxy's mapped to the TabChild that
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// asked for the ScreenForNativeWidget was called with via
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// ScreenCacheEntry's. The cache is cleared on the next tick of
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// the event loop.
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struct ScreenCacheEntry
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{
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nsRefPtr<mozilla::widget::ScreenProxy> mScreenProxy;
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nsRefPtr<mozilla::dom::TabChild> mTabChild;
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};
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nsTArray<ScreenCacheEntry> mScreenCache;
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};
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#endif // nsScreenManagerProxy_h
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