gecko/layout/base/nsImageLoader.h

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/* class to notify frames of background and border image loads */

#include "nsStubImageDecoderObserver.h"

class nsIFrame;
class nsIURI;

#include "imgIRequest.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"

/**
 * Image loaders pass notifications for background and border image
 * loading and animation on to the frames.
 *
 * Each frame's image loaders form a linked list.
 */
class nsImageLoader : public nsStubImageDecoderObserver
{
private:
  nsImageLoader(nsIFrame *aFrame, PRBool aReflowOnLoad,
                nsImageLoader *aNextLoader);
  virtual ~nsImageLoader();

public:
  static already_AddRefed<nsImageLoader>
    Create(nsIFrame *aFrame, imgIRequest *aRequest,
           PRBool aReflowOnLoad, nsImageLoader *aNextLoader);

  NS_DECL_ISUPPORTS

  // imgIDecoderObserver (override nsStubImageDecoderObserver)
  NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
  NS_IMETHOD OnStopFrame(imgIRequest *aRequest, gfxIImageFrame *aFrame);
  // Do not override OnDataAvailable since background images are not
  // displayed incrementally; they are displayed after the entire image
  // has been loaded.
  // Note: Images referenced by the <img> element are displayed
  // incrementally in nsImageFrame.cpp.

  // imgIContainerObserver (override nsStubImageDecoderObserver)
  NS_IMETHOD FrameChanged(imgIContainer *aContainer, gfxIImageFrame *newframe,
                          nsIntRect *dirtyRect);

  void Destroy();

  imgIRequest *GetRequest() { return mRequest; }
  nsImageLoader *GetNextLoader() { return mNextLoader; }

private:
  nsresult Load(imgIRequest *aImage);
  void RedrawDirtyFrame(const nsRect* aDamageRect);

  nsIFrame *mFrame;
  nsCOMPtr<imgIRequest> mRequest;
  PRBool mReflowOnLoad;
  nsRefPtr<nsImageLoader> mNextLoader;
};