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225 lines
7.4 KiB
Plaintext
225 lines
7.4 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Stuart Parmenter <pavlov@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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#include "nsIRequest.idl"
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interface imgIContainer;
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interface imgIDecoderObserver;
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interface nsIURI;
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interface nsIPrincipal;
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/**
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* imgIRequest interface
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*
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* @author Stuart Parmenter <stuart@mozilla.com>
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* @version 0.1
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* @see imagelib2
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*/
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[scriptable, uuid(d35a9adb-8328-4b64-b06f-72a165acd080)]
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interface imgIRequest : nsIRequest
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{
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/**
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* the image container...
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* @return the image object associated with the request.
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* @attention NEED DOCS
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*/
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readonly attribute imgIContainer image;
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/**
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* Bits set in the return value from imageStatus
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* @name statusflags
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*
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* Meanings:
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*
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* STATUS_NONE: Nothing to report.
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*
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* STATUS_SIZE_AVAILABLE: We received enough image data
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* from the network or filesystem that we know the width
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* and height of the image, and have thus called SetSize()
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* on the container.
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*
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* STATUS_LOAD_PARTIAL: Used internally by imgRequest to
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* flag that a request is being cancelled as a result of
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* a failure of a proxy holder and not an internal failure.
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* At least I think that's what it does. Regardless, there's
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* no reason for this flag to be public, and it should either
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* go away or become a private state flag within imgRequest.
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* Don't rely on it.
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*
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* STATUS_LOAD_COMPLETE: The data has been fully loaded
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* to memory, but not necessarily fully decoded.
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*
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* STATUS_ERROR: An error occurred loading the image.
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*
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* STATUS_FRAME_COMPLETE: The first frame has been
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* completely decoded.
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*
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* STATUS_DECODE_COMPLETE: The whole image has been decoded.
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*/
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//@{
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const long STATUS_NONE = 0x0;
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const long STATUS_SIZE_AVAILABLE = 0x1;
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const long STATUS_LOAD_PARTIAL = 0x2;
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const long STATUS_LOAD_COMPLETE = 0x4;
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const long STATUS_ERROR = 0x8;
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const long STATUS_FRAME_COMPLETE = 0x10;
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const long STATUS_DECODE_COMPLETE = 0x20;
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//@}
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/**
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* Status flags of the STATUS_* variety.
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*/
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readonly attribute unsigned long imageStatus;
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/**
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* The URI the image load was started with. Note that this might not be the
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* actual URI for the image (e.g. if HTTP redirects happened during the
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* load).
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*/
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readonly attribute nsIURI URI;
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readonly attribute imgIDecoderObserver decoderObserver;
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readonly attribute string mimeType;
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/**
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* Clone this request; the returned request will have aObserver as the
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* observer. aObserver will be notified synchronously (before the clone()
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* call returns) with all the notifications that have already been dispatched
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* for this image load.
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*/
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imgIRequest clone(in imgIDecoderObserver aObserver);
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/**
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* The principal gotten from the channel the image was loaded from.
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*/
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readonly attribute nsIPrincipal imagePrincipal;
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/**
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* CORS modes images can be loaded with.
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*
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* By default, all images are loaded with CORS_NONE and cannot be used
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* cross-origin in context like WebGL.
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*
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* If an HTML img element has the crossorigin attribute set, the imgIRequest
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* will be validated for cross-origin usage with CORS, and, if successful,
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* will have its CORS mode set to the relevant type.
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*/
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//@{
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const long CORS_NONE = 1;
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const long CORS_ANONYMOUS = 2;
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const long CORS_USE_CREDENTIALS = 3;
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//@}
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/**
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* The CORS mode that this image was loaded with.
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*/
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readonly attribute long CORSMode;
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/**
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* Cancels this request as in nsIRequest::Cancel(); further, also nulls out
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* decoderObserver so it gets no further notifications from us.
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*
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* NOTE: You should not use this in any new code; instead, use cancel(). Note
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* that cancel() is asynchronous, which means that some time after you call
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* it, the listener/observer will get an OnStopRequest(). This means that, if
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* you're the observer, you can't call cancel() from your destructor.
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*/
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void cancelAndForgetObserver(in nsresult aStatus);
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/**
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* Requests a decode for the image.
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*
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* imgIContainer has a requestDecode() method, but callers may want to request
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* a decode before the container has necessarily been instantiated. Calling
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* requestDecode() on the imgIRequest simply forwards along the request if the
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* container already exists, or calls it once it gets OnStartContainer if the
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* container does not yet exist.
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*/
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void requestDecode();
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/**
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* Locks an image. If the image does not exist yet, locks it once it becomes
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* available. The lock persists for the lifetime of the imgIRequest (until
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* unlockImage is called) even if the underlying image changes.
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*
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* If you don't call unlockImage() by the time this imgIRequest goes away, it
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* will be called for you automatically.
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*
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* @see imgIContainer::lockImage for documentation of the underlying call.
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*/
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void lockImage();
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/**
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* Unlocks an image.
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*
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* @see imgIContainer::unlockImage for documentation of the underlying call.
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*/
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void unlockImage();
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/**
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* If this image is unlocked, discard the image's decoded data. If the image
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* is locked or is already discarded, do nothing.
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*/
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void requestDiscard();
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/**
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* If this request is for an animated image, the method creates a new
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* request which contains the current frame of the image.
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* Otherwise returns the same request.
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*/
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imgIRequest getStaticRequest();
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/**
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* Requests that the image animate (if it has an animation).
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*
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* @see Image::IncrementAnimationConsumers for documentation of the underlying call.
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*/
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void incrementAnimationConsumers();
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/**
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* Tell the image it can forget about a request that the image animate.
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*
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* @see Image::DecrementAnimationConsumers for documentation of the underlying call.
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*/
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void decrementAnimationConsumers();
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};
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