forked from mirrors/gecko-dev
ad01a10a3b
Note that this patch only transforms the use of the nsDataHashtable type alias to a directly equivalent use of nsTHashMap. It does not change the specification of the hash key type to make use of the key class deduction that nsTHashMap allows for in some cases. That can be done in a separate step, but requires more attention. Differential Revision: https://phabricator.services.mozilla.com/D106008
72 lines
2.2 KiB
C++
72 lines
2.2 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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/* table of images used in a document, for batch locking/unlocking and
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* animating */
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#ifndef mozilla_dom_ImageTracker
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#define mozilla_dom_ImageTracker
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#include "nsTHashMap.h"
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#include "nsHashKeys.h"
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class imgIRequest;
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namespace mozilla {
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struct MediaFeatureChange;
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}
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namespace mozilla {
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namespace dom {
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/*
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* Image Tracking
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*
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* Style and content images register their imgIRequests with their document's
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* image tracker, so that we can efficiently tell all descendant images when
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* they are and are not visible. When an image is on-screen, we want to call
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* LockImage() on it so that it doesn't do things like discarding frame data
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* to save memory. The PresShell informs its document's image tracker whether
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* its images should be locked or not via SetLockingState().
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*
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* See bug 512260.
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*/
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class ImageTracker {
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public:
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ImageTracker();
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ImageTracker(const ImageTracker&) = delete;
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ImageTracker& operator=(const ImageTracker&) = delete;
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ImageTracker)
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nsresult Add(imgIRequest* aImage);
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enum { REQUEST_DISCARD = 0x1 };
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nsresult Remove(imgIRequest* aImage, uint32_t aFlags = 0);
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// Makes the images on this document locked/unlocked. By default, the locking
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// state is unlocked/false.
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nsresult SetLockingState(bool aLocked);
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// Makes the images on this document capable of having their animation
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// active or suspended. An Image will animate as long as at least one of its
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// owning Documents needs it to animate; otherwise it can suspend.
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void SetAnimatingState(bool aAnimating);
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void RequestDiscardAll();
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void MediaFeatureValuesChangedAllDocuments(const MediaFeatureChange&);
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private:
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~ImageTracker();
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nsTHashMap<nsPtrHashKey<imgIRequest>, uint32_t> mImages;
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bool mLocking;
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bool mAnimating;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_ImageTracker
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