1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/style/ImageLoader.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,120 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.6 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +// A class that handles style system image loads (other image loads are handled
1.9 +// by the nodes in the content tree).
1.10 +
1.11 +#ifndef mozilla_css_ImageLoader_h___
1.12 +#define mozilla_css_ImageLoader_h___
1.13 +
1.14 +#include "nsClassHashtable.h"
1.15 +#include "nsHashKeys.h"
1.16 +#include "nsCSSValue.h"
1.17 +#include "imgIRequest.h"
1.18 +#include "imgIOnloadBlocker.h"
1.19 +#include "imgINotificationObserver.h"
1.20 +#include "mozilla/Attributes.h"
1.21 +
1.22 +class nsIFrame;
1.23 +class nsIDocument;
1.24 +class nsPresContext;
1.25 +class nsIURI;
1.26 +class nsIPrincipal;
1.27 +
1.28 +namespace mozilla {
1.29 +namespace css {
1.30 +
1.31 +class ImageLoader MOZ_FINAL : public imgINotificationObserver,
1.32 + public imgIOnloadBlocker {
1.33 +public:
1.34 + typedef mozilla::css::ImageValue Image;
1.35 +
1.36 + ImageLoader(nsIDocument* aDocument)
1.37 + : mDocument(aDocument),
1.38 + mInClone(false)
1.39 + {
1.40 + MOZ_ASSERT(mDocument);
1.41 + }
1.42 +
1.43 + NS_DECL_ISUPPORTS
1.44 + NS_DECL_IMGIONLOADBLOCKER
1.45 + NS_DECL_IMGINOTIFICATIONOBSERVER
1.46 +
1.47 + void DropDocumentReference();
1.48 +
1.49 + void MaybeRegisterCSSImage(Image* aImage);
1.50 + void DeregisterCSSImage(Image* aImage);
1.51 +
1.52 + void AssociateRequestToFrame(imgIRequest* aRequest,
1.53 + nsIFrame* aFrame);
1.54 +
1.55 + void DisassociateRequestFromFrame(imgIRequest* aRequest,
1.56 + nsIFrame* aFrame);
1.57 +
1.58 + void DropRequestsForFrame(nsIFrame* aFrame);
1.59 +
1.60 + void SetAnimationMode(uint16_t aMode);
1.61 +
1.62 + void ClearFrames();
1.63 +
1.64 + void LoadImage(nsIURI* aURI, nsIPrincipal* aPrincipal, nsIURI* aReferrer,
1.65 + Image* aCSSValue);
1.66 +
1.67 + void DestroyRequest(imgIRequest* aRequest);
1.68 +
1.69 +private:
1.70 + // We need to be able to look up the frames associated with a request (for
1.71 + // delivering notifications) and the requests associated with a frame (when
1.72 + // the frame goes away). Thus we maintain hashtables going both ways. These
1.73 + // should always be in sync.
1.74 +
1.75 + typedef nsTArray<nsIFrame*> FrameSet;
1.76 + typedef nsTArray<nsCOMPtr<imgIRequest> > RequestSet;
1.77 + typedef nsTHashtable<nsPtrHashKey<Image> > ImageHashSet;
1.78 + typedef nsClassHashtable<nsISupportsHashKey,
1.79 + FrameSet> RequestToFrameMap;
1.80 + typedef nsClassHashtable<nsPtrHashKey<nsIFrame>,
1.81 + RequestSet> FrameToRequestMap;
1.82 +
1.83 + void AddImage(Image* aCSSImage);
1.84 + void RemoveImage(Image* aCSSImage);
1.85 +
1.86 + nsPresContext* GetPresContext();
1.87 +
1.88 + void DoRedraw(FrameSet* aFrameSet);
1.89 +
1.90 + static PLDHashOperator
1.91 + SetAnimationModeEnumerator(nsISupports* aKey, FrameSet* aValue,
1.92 + void* aClosure);
1.93 +
1.94 + nsresult OnStartContainer(imgIRequest *aRequest, imgIContainer* aImage);
1.95 + nsresult OnStopFrame(imgIRequest *aRequest);
1.96 + nsresult OnImageIsAnimated(imgIRequest *aRequest);
1.97 + nsresult FrameChanged(imgIRequest* aRequest);
1.98 + // Do not override OnDataAvailable since background images are not
1.99 + // displayed incrementally; they are displayed after the entire image
1.100 + // has been loaded.
1.101 +
1.102 + // A map of imgIRequests to the nsIFrames that are using them.
1.103 + RequestToFrameMap mRequestToFrameMap;
1.104 +
1.105 + // A map of nsIFrames to the imgIRequests they use.
1.106 + FrameToRequestMap mFrameToRequestMap;
1.107 +
1.108 + // A weak pointer to our document. Nulled out by DropDocumentReference.
1.109 + nsIDocument* mDocument;
1.110 +
1.111 + // The set of all nsCSSValue::Images (whether they're associated a frame or
1.112 + // not). We'll need this when we go away to remove any requests associated
1.113 + // with our document from those Images.
1.114 + ImageHashSet mImages;
1.115 +
1.116 + // Are we cloning? If so, ignore any notifications we get.
1.117 + bool mInClone;
1.118 +};
1.119 +
1.120 +} // namespace css
1.121 +} // namespace mozilla
1.122 +
1.123 +#endif /* mozilla_css_ImageLoader_h___ */
