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295021d470
Normally a frame being destroyed would do this via PresShell::NotifyDestroyingFrame -> ImageLoader::DropRequestsForFrame but when we are tearing down the whole frame tree we skip per frame notifications like that for perf reasons. So we now make sure to do it when clearing out frames wholesale. We also need to pass a prescontext pointer to ClearFrames because the ImageLoader only has a document pointer, and by that point in the presshell destruction sequence the presshell pointer on the document has been cleared.
133 lines
4.1 KiB
C++
133 lines
4.1 KiB
C++
/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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// A class that handles style system image loads (other image loads are handled
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// by the nodes in the content tree).
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#ifndef mozilla_css_ImageLoader_h___
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#define mozilla_css_ImageLoader_h___
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#include "nsClassHashtable.h"
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#include "nsHashKeys.h"
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#include "nsTArray.h"
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#include "imgIRequest.h"
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#include "imgIOnloadBlocker.h"
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#include "imgINotificationObserver.h"
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#include "mozilla/Attributes.h"
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class imgIContainer;
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class nsIFrame;
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class nsIDocument;
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class nsPresContext;
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class nsIURI;
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class nsIPrincipal;
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namespace mozilla {
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namespace css {
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struct ImageValue;
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class ImageLoader MOZ_FINAL : public imgINotificationObserver,
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public imgIOnloadBlocker {
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public:
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typedef mozilla::css::ImageValue Image;
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explicit ImageLoader(nsIDocument* aDocument)
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: mDocument(aDocument),
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mInClone(false)
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{
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MOZ_ASSERT(mDocument);
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}
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NS_DECL_ISUPPORTS
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NS_DECL_IMGIONLOADBLOCKER
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NS_DECL_IMGINOTIFICATIONOBSERVER
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void DropDocumentReference();
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void MaybeRegisterCSSImage(Image* aImage);
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void DeregisterCSSImage(Image* aImage);
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void AssociateRequestToFrame(imgIRequest* aRequest,
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nsIFrame* aFrame);
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void DisassociateRequestFromFrame(imgIRequest* aRequest,
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nsIFrame* aFrame);
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void DropRequestsForFrame(nsIFrame* aFrame);
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void SetAnimationMode(uint16_t aMode);
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// The prescontext for this ImageLoader's document. We need it to be passed
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// in because this can be called during presentation destruction after the
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// presshell pointer on the document has been cleared.
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void ClearFrames(nsPresContext* aPresContext);
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void LoadImage(nsIURI* aURI, nsIPrincipal* aPrincipal, nsIURI* aReferrer,
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Image* aCSSValue);
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void DestroyRequest(imgIRequest* aRequest);
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private:
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~ImageLoader() {}
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// We need to be able to look up the frames associated with a request (for
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// delivering notifications) and the requests associated with a frame (when
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// the frame goes away). Thus we maintain hashtables going both ways. These
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// should always be in sync.
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typedef nsTArray<nsIFrame*> FrameSet;
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typedef nsTArray<nsCOMPtr<imgIRequest> > RequestSet;
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typedef nsTHashtable<nsPtrHashKey<Image> > ImageHashSet;
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typedef nsClassHashtable<nsISupportsHashKey,
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FrameSet> RequestToFrameMap;
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typedef nsClassHashtable<nsPtrHashKey<nsIFrame>,
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RequestSet> FrameToRequestMap;
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void AddImage(Image* aCSSImage);
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void RemoveImage(Image* aCSSImage);
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nsPresContext* GetPresContext();
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void DoRedraw(FrameSet* aFrameSet);
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static PLDHashOperator
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SetAnimationModeEnumerator(nsISupports* aKey, FrameSet* aValue,
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void* aClosure);
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static PLDHashOperator
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DeregisterRequestEnumerator(nsISupports* aKey, FrameSet* aValue,
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void* aClosure);
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nsresult OnStartContainer(imgIRequest *aRequest, imgIContainer* aImage);
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nsresult OnStopFrame(imgIRequest *aRequest);
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nsresult OnImageIsAnimated(imgIRequest *aRequest);
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nsresult FrameChanged(imgIRequest* aRequest);
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// Do not override OnDataAvailable since background images are not
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// displayed incrementally; they are displayed after the entire image
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// has been loaded.
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// A map of imgIRequests to the nsIFrames that are using them.
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RequestToFrameMap mRequestToFrameMap;
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// A map of nsIFrames to the imgIRequests they use.
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FrameToRequestMap mFrameToRequestMap;
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// A weak pointer to our document. Nulled out by DropDocumentReference.
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nsIDocument* mDocument;
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// The set of all nsCSSValue::Images (whether they're associated a frame or
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// not). We'll need this when we go away to remove any requests associated
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// with our document from those Images.
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ImageHashSet mImages;
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// Are we cloning? If so, ignore any notifications we get.
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bool mInClone;
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};
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} // namespace css
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} // namespace mozilla
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#endif /* mozilla_css_ImageLoader_h___ */
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