1 files changed, 124 insertions, 0 deletions
diff --git a/layout/style/ImageLoader.h b/layout/style/ImageLoader.h
new file mode 100644
index 0000000000..4e29da5ed4
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+++ b/layout/style/ImageLoader.h
@@ -0,0 +1,124 @@
+/* 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).
+
+#ifndef mozilla_css_ImageLoader_h___
+#define mozilla_css_ImageLoader_h___
+
+#include "nsClassHashtable.h"
+#include "nsHashKeys.h"
+#include "nsTArray.h"
+#include "imgIRequest.h"
+#include "imgIOnloadBlocker.h"
+#include "imgINotificationObserver.h"
+#include "mozilla/Attributes.h"
+
+class imgIContainer;
+class nsIFrame;
+class nsIDocument;
+class nsPresContext;
+class nsIURI;
+class nsIPrincipal;
+
+namespace mozilla {
+namespace css {
+
+struct ImageValue;
+
+class ImageLoader final : public imgINotificationObserver,
+                          public imgIOnloadBlocker
+{
+public:
+  typedef mozilla::css::ImageValue Image;
+
+  explicit ImageLoader(nsIDocument* aDocument)
+  : mDocument(aDocument),
+    mInClone(false)
+  {
+    MOZ_ASSERT(mDocument);
+  }
+
+  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);
+
+  // The prescontext for this ImageLoader's document. We need it to be passed
+  // in because this can be called during presentation destruction after the
+  // presshell pointer on the document has been cleared.
+  void ClearFrames(nsPresContext* aPresContext);
+
+  void LoadImage(nsIURI* aURI, nsIPrincipal* aPrincipal, nsIURI* aReferrer,
+                 Image* aCSSValue);
+
+  void DestroyRequest(imgIRequest* aRequest);
+
+  void FlushUseCounters();
+
+private:
+  ~ImageLoader() {}
+
+  // 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, bool aForcePaint);
+
+  nsresult OnSizeAvailable(imgIRequest* aRequest, imgIContainer* aImage);
+  nsresult OnFrameComplete(imgIRequest* aRequest);
+  nsresult OnImageIsAnimated(imgIRequest* aRequest);
+  nsresult OnFrameUpdate(imgIRequest* aRequest);
+
+  // 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
+
+#endif /* mozilla_css_ImageLoader_h___ */