/*
 * DO NOT EDIT.  THIS FILE IS GENERATED FROM e:/builds/moz2_slave/mozilla-central-win32-xulrunner/build/modules/libpr0n/public/imgIDecoderObserver.idl
 */

#ifndef __gen_imgIDecoderObserver_h__
#define __gen_imgIDecoderObserver_h__


#ifndef __gen_imgIContainerObserver_h__
#include "imgIContainerObserver.h"
#endif

/* For IDL files that don't want to include root IDL files. */
#ifndef NS_NO_VTABLE
#define NS_NO_VTABLE
#endif
class imgIRequest; /* forward declaration */

class imgIContainer; /* forward declaration */

#include "nsRect.h"

/* starting interface:    imgIDecoderObserver */
#define IMGIDECODEROBSERVER_IID_STR "9f6bfbee-9e04-43a0-b8f6-2159973efec8"

#define IMGIDECODEROBSERVER_IID \
  {0x9f6bfbee, 0x9e04, 0x43a0, \
    { 0xb8, 0xf6, 0x21, 0x59, 0x97, 0x3e, 0xfe, 0xc8 }}

/**
 * imgIDecoderObserver interface
 *
 * This interface is used both for observing imgIDecoder objects and for
 * observing imgIRequest objects.  In the former case, aRequest is
 * always null.
 *
 * We make the distinction here between "load" and "decode" notifications. Load
 * notifications are fired as the image is loaded from the network or
 * filesystem. Decode notifications are fired as the image is decoded. If an
 * image is decoded on load and not visibly discarded, decode notifications are
 * nested logically inside load notifications as one might expect. However, with
 * decode-on-draw, the set of decode notifications can come completely _after_
 * the load notifications, and can come multiple times if the image is
 * discardable. Moreover, they can be interleaved in various ways. In general,
 * any presumed ordering between load and decode notifications should not be
 * relied upon.
 *
 * Decode notifications may or may not be synchronous, depending on the
 * situation. If imgIDecoder::FLAG_SYNC_DECODE is passed to a function that
 * triggers a decode, all notifications that can be generated from the currently
 * loaded data fire before the call returns. If FLAG_SYNC_DECODE is not passed,
 * all, some, or none of the notifications may fire before the call returns.
 *
 * This interface will be cleaned up in bug 505385.
 *
 * @author Stuart Parmenter <pavlov@netscape.com>
 * @version 0.1
 * @see imagelib2
 */
class NS_NO_VTABLE NS_SCRIPTABLE imgIDecoderObserver : public imgIContainerObserver {
 public: 

  NS_DECLARE_STATIC_IID_ACCESSOR(IMGIDECODEROBSERVER_IID)

  /**
   * Load notification.
   *
   * called at the same time that nsIRequestObserver::onStartRequest would be
   * (used only for observers of imgIRequest objects, which are nsIRequests,
   * not imgIDecoder objects)
   *
   * Unlike nsIRequestObserver::onStartRequest, this can be called
   * synchronously.
   */
  /* void onStartRequest (in imgIRequest aRequest); */
  NS_SCRIPTABLE NS_IMETHOD OnStartRequest(imgIRequest *aRequest) = 0;

  /**
   * Decode notification.
   *
   * Called as soon as the image begins getting decoded. This does not include
   * "header-only" decodes used by decode-on-draw to parse the width/height
   * out of the image. Thus, it is a decode notification only.
   */
  /* void onStartDecode (in imgIRequest aRequest); */
  NS_SCRIPTABLE NS_IMETHOD OnStartDecode(imgIRequest *aRequest) = 0;

  /**
   * Load notification.
   *
   * Called once enough data has been loaded from the network that we were able
   * to parse the width/height from the image. By the time this callback is been
   * called, the size has been set on the container and STATUS_SIZE_AVAILABLE
   * has been set on the associated imgRequest.
   */
  /* void onStartContainer (in imgIRequest aRequest, in imgIContainer aContainer); */
  NS_SCRIPTABLE NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aContainer) = 0;

  /**
   * Decode notification.
   *
   * called when each frame is created.
   */
  /* void onStartFrame (in imgIRequest aRequest, in unsigned long aFrame); */
  NS_SCRIPTABLE NS_IMETHOD OnStartFrame(imgIRequest *aRequest, PRUint32 aFrame) = 0;

  /**
   * Decode notification.
   *
   * called when there is more to paint.
   */
  /* [noscript] void onDataAvailable (in imgIRequest aRequest, in boolean aCurrentFrame, [const] in nsIntRect aRect); */
  NS_IMETHOD OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame, const nsIntRect * aRect) = 0;

  /**
   * Decode notification.
   *
   * called when a frame is finished decoding.
   */
  /* void onStopFrame (in imgIRequest aRequest, in unsigned long aFrame); */
  NS_SCRIPTABLE NS_IMETHOD OnStopFrame(imgIRequest *aRequest, PRUint32 aFrame) = 0;

  /**
   * Do not implement this. It is useless and going away.
   */
  /* void onStopContainer (in imgIRequest aRequest, in imgIContainer aContainer); */
  NS_SCRIPTABLE NS_IMETHOD OnStopContainer(imgIRequest *aRequest, imgIContainer *aContainer) = 0;

  /**
   * In theory a decode notification, but currently a load notification.
   *
   * Ideally this would be called when the decode is complete. Unfortunately,
   * this is currently the only way to signal decoding errors to consumers,
   * and the only decoding errors that consumers care about (indeed, the only
   * ones that they're prepared to hear about) are failures to instantiate the
   * decoder (<img src="foo.html"> for example). Thus, currently this is just
   * a companion to onStopDecode to signal success or failure. This will be
   * revisited in bug 505385. If you're thinking of doing something new with
   * this, please talk to bholley first.
   */
  /* void onStopDecode (in imgIRequest aRequest, in nsresult status, in wstring statusArg); */
  NS_SCRIPTABLE NS_IMETHOD OnStopDecode(imgIRequest *aRequest, nsresult status, const PRUnichar *statusArg) = 0;

  /**
   * Load notification.
   *
   * called at the same time that nsIRequestObserver::onStopRequest would be
   * (used only for observers of imgIRequest objects, which are nsIRequests,
   * not imgIDecoder objects)
   *
   * Unlike nsIRequestObserver::onStartRequest, this can be called
   * synchronously.
   */
  /* void onStopRequest (in imgIRequest aRequest, in boolean aIsLastPart); */
  NS_SCRIPTABLE NS_IMETHOD OnStopRequest(imgIRequest *aRequest, PRBool aIsLastPart) = 0;

  /**
   * Called when the decoded image data is discarded. This means that the frames
   * no longer exist in decoded form, and any attempt to access or draw the
   * image will initiate a new series of progressive decode notifications.
   */
  /* void onDiscard (in imgIRequest aRequest); */
  NS_SCRIPTABLE NS_IMETHOD OnDiscard(imgIRequest *aRequest) = 0;

};

  NS_DEFINE_STATIC_IID_ACCESSOR(imgIDecoderObserver, IMGIDECODEROBSERVER_IID)

/* Use this macro when declaring classes that implement this interface. */
#define NS_DECL_IMGIDECODEROBSERVER \
  NS_SCRIPTABLE NS_IMETHOD OnStartRequest(imgIRequest *aRequest); \
  NS_SCRIPTABLE NS_IMETHOD OnStartDecode(imgIRequest *aRequest); \
  NS_SCRIPTABLE NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aContainer); \
  NS_SCRIPTABLE NS_IMETHOD OnStartFrame(imgIRequest *aRequest, PRUint32 aFrame); \
  NS_IMETHOD OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame, const nsIntRect * aRect); \
  NS_SCRIPTABLE NS_IMETHOD OnStopFrame(imgIRequest *aRequest, PRUint32 aFrame); \
  NS_SCRIPTABLE NS_IMETHOD OnStopContainer(imgIRequest *aRequest, imgIContainer *aContainer); \
  NS_SCRIPTABLE NS_IMETHOD OnStopDecode(imgIRequest *aRequest, nsresult status, const PRUnichar *statusArg); \
  NS_SCRIPTABLE NS_IMETHOD OnStopRequest(imgIRequest *aRequest, PRBool aIsLastPart); \
  NS_SCRIPTABLE NS_IMETHOD OnDiscard(imgIRequest *aRequest); 

/* Use this macro to declare functions that forward the behavior of this interface to another object. */
#define NS_FORWARD_IMGIDECODEROBSERVER(_to) \
  NS_SCRIPTABLE NS_IMETHOD OnStartRequest(imgIRequest *aRequest) { return _to OnStartRequest(aRequest); } \
  NS_SCRIPTABLE NS_IMETHOD OnStartDecode(imgIRequest *aRequest) { return _to OnStartDecode(aRequest); } \
  NS_SCRIPTABLE NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aContainer) { return _to OnStartContainer(aRequest, aContainer); } \
  NS_SCRIPTABLE NS_IMETHOD OnStartFrame(imgIRequest *aRequest, PRUint32 aFrame) { return _to OnStartFrame(aRequest, aFrame); } \
  NS_IMETHOD OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame, const nsIntRect * aRect) { return _to OnDataAvailable(aRequest, aCurrentFrame, aRect); } \
  NS_SCRIPTABLE NS_IMETHOD OnStopFrame(imgIRequest *aRequest, PRUint32 aFrame) { return _to OnStopFrame(aRequest, aFrame); } \
  NS_SCRIPTABLE NS_IMETHOD OnStopContainer(imgIRequest *aRequest, imgIContainer *aContainer) { return _to OnStopContainer(aRequest, aContainer); } \
  NS_SCRIPTABLE NS_IMETHOD OnStopDecode(imgIRequest *aRequest, nsresult status, const PRUnichar *statusArg) { return _to OnStopDecode(aRequest, status, statusArg); } \
  NS_SCRIPTABLE NS_IMETHOD OnStopRequest(imgIRequest *aRequest, PRBool aIsLastPart) { return _to OnStopRequest(aRequest, aIsLastPart); } \
  NS_SCRIPTABLE NS_IMETHOD OnDiscard(imgIRequest *aRequest) { return _to OnDiscard(aRequest); } 

/* Use this macro to declare functions that forward the behavior of this interface to another object in a safe way. */
#define NS_FORWARD_SAFE_IMGIDECODEROBSERVER(_to) \
  NS_SCRIPTABLE NS_IMETHOD OnStartRequest(imgIRequest *aRequest) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnStartRequest(aRequest); } \
  NS_SCRIPTABLE NS_IMETHOD OnStartDecode(imgIRequest *aRequest) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnStartDecode(aRequest); } \
  NS_SCRIPTABLE NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aContainer) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnStartContainer(aRequest, aContainer); } \
  NS_SCRIPTABLE NS_IMETHOD OnStartFrame(imgIRequest *aRequest, PRUint32 aFrame) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnStartFrame(aRequest, aFrame); } \
  NS_IMETHOD OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame, const nsIntRect * aRect) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnDataAvailable(aRequest, aCurrentFrame, aRect); } \
  NS_SCRIPTABLE NS_IMETHOD OnStopFrame(imgIRequest *aRequest, PRUint32 aFrame) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnStopFrame(aRequest, aFrame); } \
  NS_SCRIPTABLE NS_IMETHOD OnStopContainer(imgIRequest *aRequest, imgIContainer *aContainer) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnStopContainer(aRequest, aContainer); } \
  NS_SCRIPTABLE NS_IMETHOD OnStopDecode(imgIRequest *aRequest, nsresult status, const PRUnichar *statusArg) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnStopDecode(aRequest, status, statusArg); } \
  NS_SCRIPTABLE NS_IMETHOD OnStopRequest(imgIRequest *aRequest, PRBool aIsLastPart) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnStopRequest(aRequest, aIsLastPart); } \
  NS_SCRIPTABLE NS_IMETHOD OnDiscard(imgIRequest *aRequest) { return !_to ? NS_ERROR_NULL_POINTER : _to->OnDiscard(aRequest); } 

#if 0
/* Use the code below as a template for the implementation class for this interface. */

/* Header file */
class _MYCLASS_ : public imgIDecoderObserver
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_IMGIDECODEROBSERVER

  _MYCLASS_();

private:
  ~_MYCLASS_();

protected:
  /* additional members */
};

/* Implementation file */
NS_IMPL_ISUPPORTS1(_MYCLASS_, imgIDecoderObserver)

_MYCLASS_::_MYCLASS_()
{
  /* member initializers and constructor code */
}

_MYCLASS_::~_MYCLASS_()
{
  /* destructor code */
}

/* void onStartRequest (in imgIRequest aRequest); */
NS_IMETHODIMP _MYCLASS_::OnStartRequest(imgIRequest *aRequest)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void onStartDecode (in imgIRequest aRequest); */
NS_IMETHODIMP _MYCLASS_::OnStartDecode(imgIRequest *aRequest)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void onStartContainer (in imgIRequest aRequest, in imgIContainer aContainer); */
NS_IMETHODIMP _MYCLASS_::OnStartContainer(imgIRequest *aRequest, imgIContainer *aContainer)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void onStartFrame (in imgIRequest aRequest, in unsigned long aFrame); */
NS_IMETHODIMP _MYCLASS_::OnStartFrame(imgIRequest *aRequest, PRUint32 aFrame)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* [noscript] void onDataAvailable (in imgIRequest aRequest, in boolean aCurrentFrame, [const] in nsIntRect aRect); */
NS_IMETHODIMP _MYCLASS_::OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame, const nsIntRect * aRect)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void onStopFrame (in imgIRequest aRequest, in unsigned long aFrame); */
NS_IMETHODIMP _MYCLASS_::OnStopFrame(imgIRequest *aRequest, PRUint32 aFrame)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void onStopContainer (in imgIRequest aRequest, in imgIContainer aContainer); */
NS_IMETHODIMP _MYCLASS_::OnStopContainer(imgIRequest *aRequest, imgIContainer *aContainer)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void onStopDecode (in imgIRequest aRequest, in nsresult status, in wstring statusArg); */
NS_IMETHODIMP _MYCLASS_::OnStopDecode(imgIRequest *aRequest, nsresult status, const PRUnichar *statusArg)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void onStopRequest (in imgIRequest aRequest, in boolean aIsLastPart); */
NS_IMETHODIMP _MYCLASS_::OnStopRequest(imgIRequest *aRequest, PRBool aIsLastPart)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void onDiscard (in imgIRequest aRequest); */
NS_IMETHODIMP _MYCLASS_::OnDiscard(imgIRequest *aRequest)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* End of implementation class template. */
#endif


#endif /* __gen_imgIDecoderObserver_h__ */
