зеркало из https://github.com/mozilla/gecko-dev.git
133 строки
4.1 KiB
C++
133 строки
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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