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/* 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/. */
// A class that handles style system image loads (other image loads are handled
// by the nodes in the content tree).
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#include "nsCSSValue.h"
#include "imgIRequest.h"
#include "imgIOnloadBlocker.h"
#include "imgINotificationObserver.h"
#include "mozilla/Attributes.h"
class nsIFrame;
class nsIDocument;
class nsPresContext;
class nsIURI;
class nsIPrincipal;
namespace mozilla {
namespace css {
class ImageLoader MOZ_FINAL : public imgINotificationObserver,
public imgIOnloadBlocker {
public:
typedef mozilla::css::ImageValue Image;
ImageLoader(nsIDocument* aDocument)
: mDocument(aDocument),
mInClone(false)
{
MOZ_ASSERT(mDocument);
mRequestToFrameMap.Init();
mFrameToRequestMap.Init();
mImages.Init();
}
NS_DECL_ISUPPORTS
NS_DECL_IMGIONLOADBLOCKER
NS_DECL_IMGINOTIFICATIONOBSERVER
void DropDocumentReference();
void MaybeRegisterCSSImage(Image* aImage);
void DeregisterCSSImage(Image* aImage);
void AssociateRequestToFrame(imgIRequest* aRequest,
nsIFrame* aFrame);
void DisassociateRequestFromFrame(imgIRequest* aRequest,
nsIFrame* aFrame);
void DropRequestsForFrame(nsIFrame* aFrame);
void SetAnimationMode(uint16_t aMode);
void ClearFrames();
void LoadImage(nsIURI* aURI, nsIPrincipal* aPrincipal, nsIURI* aReferrer,
Image* aCSSValue);
void DestroyRequest(imgIRequest* aRequest);
private:
// We need to be able to look up the frames associated with a request (for
// delivering notifications) and the requests associated with a frame (when
// the frame goes away). Thus we maintain hashtables going both ways. These
// should always be in sync.
typedef nsTArray<nsIFrame*> FrameSet;
typedef nsTArray<nsCOMPtr<imgIRequest> > RequestSet;
typedef nsTHashtable<nsPtrHashKey<Image> > ImageHashSet;
typedef nsClassHashtable<nsISupportsHashKey,
FrameSet> RequestToFrameMap;
typedef nsClassHashtable<nsPtrHashKey<nsIFrame>,
RequestSet> FrameToRequestMap;
void AddImage(Image* aCSSImage);
void RemoveImage(Image* aCSSImage);
nsPresContext* GetPresContext();
void DoRedraw(FrameSet* aFrameSet);
static PLDHashOperator
SetAnimationModeEnumerator(nsISupports* aKey, FrameSet* aValue,
void* aClosure);
nsresult OnStartContainer(imgIRequest *aRequest, imgIContainer* aImage);
nsresult OnStopFrame(imgIRequest *aRequest);
nsresult OnImageIsAnimated(imgIRequest *aRequest);
nsresult FrameChanged(imgIRequest* aRequest);
// Do not override OnDataAvailable since background images are not
// displayed incrementally; they are displayed after the entire image
// has been loaded.
// A map of imgIRequests to the nsIFrames that are using them.
RequestToFrameMap mRequestToFrameMap;
// A map of nsIFrames to the imgIRequests they use.
FrameToRequestMap mFrameToRequestMap;
// A weak pointer to our document. Nulled out by DropDocumentReference.
nsIDocument* mDocument;
// The set of all nsCSSValue::Images (whether they're associated a frame or
// not). We'll need this when we go away to remove any requests associated
// with our document from those Images.
ImageHashSet mImages;
// Are we cloning? If so, ignore any notifications we get.
bool mInClone;
};
} // namespace css
} // namespace mozilla
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