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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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/. */

#include "nsISupports.idl"

interface imgINotificationObserver;
interface imgIRequest;

interface nsIChannel;
interface nsILoadGroup;
interface nsIPrincipal;
interface nsIStreamListener;
interface nsIURI;
interface nsIReferrerInfo;

interface nsISimpleEnumerator;

#include "nsIRequest.idl" // for nsLoadFlags
#include "nsIContentPolicy.idl" // for nsContentPolicyType

/**
 * imgILoader interface
 *
 * @author Stuart Parmenter <pavlov@netscape.com>
 * @version 0.3
 * @see imagelib2
 */
[scriptable, builtinclass, uuid(e61377d2-910e-4c65-a64b-428d150e1fd1)]
interface imgILoader : nsISupports
{
  // Extra flags to pass to loadImage if you want a load to use CORS
  // validation.
  const unsigned long LOAD_CORS_ANONYMOUS = 1 << 16;
  const unsigned long LOAD_CORS_USE_CREDENTIALS = 1 << 17;

  /**
   * Start the load and decode of an image.
   * @param aURI the URI to load
   * @param aInitialDocumentURI the URI that 'initiated' the load -- used for
   *           3rd party cookie blocking
   * @param aReferrerInfo the referrer info to compute sending referrer.
   * @param aLoadingPrincipal the principal of the loading document
   * @param aLoadGroup Loadgroup to put the image load into
   * @param aObserver the observer (may be null)
   * @param aCX some random data
   * @param aLoadFlags Load flags for the request
   * @param aCacheKey cache key to use for a load if the original
   *                  image came from a request that had post data
   * @param aContentPolicyType [optional] the nsContentPolicyType to
   *                           use for this load. Defaults to
   *                           nsIContentPolicy::TYPE_IMAGE


   * ImageLib does NOT keep a strong ref to the observer; this prevents
   * reference cycles.  This means that callers of loadImage should
   * make sure to Cancel() the resulting request before the observer
   * goes away.
   */
  imgIRequest loadImageXPCOM(in nsIURI aURI,
                             in nsIURI aInitialDocumentURL,
                             in nsIReferrerInfo aReferrerInfo,
                             in nsIPrincipal aLoadingPrincipal,
                             in nsILoadGroup aLoadGroup,
                             in imgINotificationObserver aObserver,
                             in nsISupports aCX,
                             in nsLoadFlags aLoadFlags,
                             in nsISupports cacheKey,
                             [optional]
                             in nsContentPolicyType aContentPolicyType);

  /**
   * Start the load and decode of an image.
   * @param aChannel the channel to load the image from.  This must
   *                 already be opened before ths method is called, and there
   *                 must have been no OnDataAvailable calls for it yet.
   * @param aObserver the observer (may be null)
   * @param cx some random data
   * @param aListener [out]
   *        A listener that you must send the channel's notifications and data
   *        to.  Can be null, in which case imagelib has found a cached image
   *        and is not interested in the data. @aChannel will be canceled for
   *        you in this case.
   *
   * ImageLib does NOT keep a strong ref to the observer; this prevents
   * reference cycles.  This means that callers of loadImageWithChannel should
   * make sure to Cancel() the resulting request before the observer goes away.
   */
  imgIRequest loadImageWithChannelXPCOM(in nsIChannel aChannel,
                                        in imgINotificationObserver aObserver,
                                        in nsISupports cx,
                                        out nsIStreamListener aListener);
};