/* -*- 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"
#include "nsIRequest.idl"
interface imgIContainer;
interface imgINotificationObserver;
interface nsIURI;
interface nsIPrincipal;
/**
* imgIRequest interface
*
* @author Stuart Parmenter <stuart@mozilla.com>
* @version 0.1
* @see imagelib2
*/
[scriptable, builtinclass, uuid(db0a945c-3883-424a-98d0-2ee0523b0255)]
interface imgIRequest : nsIRequest
{
/**
* the image container...
* @return the image object associated with the request.
* @attention NEED DOCS
*/
readonly attribute imgIContainer image;
/**
* Bits set in the return value from imageStatus
* @name statusflags
*
* Meanings:
*
* STATUS_NONE: Nothing to report.
*
* STATUS_SIZE_AVAILABLE: We received enough image data
* from the network or filesystem that we know the width
* and height of the image, and have thus called SetSize()
* on the container.
*
* STATUS_LOAD_COMPLETE: The data has been fully loaded
* to memory, but not necessarily fully decoded.
*
* STATUS_ERROR: An error occurred loading the image.
*
* STATUS_FRAME_COMPLETE: The first frame has been
* completely decoded.
*
* STATUS_DECODE_COMPLETE: The whole image has been decoded.
*
* STATUS_IS_ANIMATED: The image is animated.
*
* STATUS_HAS_TRANSPARENCY: The image is partially or completely transparent.
*/
//@{
const long STATUS_NONE = 0x0;
const long STATUS_SIZE_AVAILABLE = 0x1;
const long STATUS_LOAD_COMPLETE = 0x2;
const long STATUS_ERROR = 0x4;
const long STATUS_FRAME_COMPLETE = 0x8;
const long STATUS_DECODE_COMPLETE = 0x10;
const long STATUS_IS_ANIMATED = 0x20;
const long STATUS_HAS_TRANSPARENCY = 0x40;
//@}
/**
* Status flags of the STATUS_* variety.
*/
readonly attribute unsigned long imageStatus;
/*
* Actual error code that generated a STATUS_ERROR imageStatus
* (see xpcom/base/ErrorList.h)
*/
[noscript] readonly attribute nsresult imageErrorCode;
/**
* The URI the image load was started with. Note that this might not be the
* actual URI for the image (e.g. if HTTP redirects happened during the
* load).
*/
readonly attribute nsIURI URI;
/**
* The URI of the resource we ended up loading after all redirects, etc.
*/
readonly attribute nsIURI finalURI;
readonly attribute imgINotificationObserver notificationObserver;
readonly attribute string mimeType;
/**
* Clone this request; the returned request will have aObserver as the
* observer. aObserver will be notified synchronously (before the clone()
* call returns) with all the notifications that have already been dispatched
* for this image load.
*/
imgIRequest clone(in imgINotificationObserver aObserver);
/**
* The principal gotten from the channel the image was loaded from.
*/
readonly attribute nsIPrincipal imagePrincipal;
/**
* Whether the request is multipart (ie, multipart/x-mixed-replace)
*/
readonly attribute bool multipart;
/**
* CORS modes images can be loaded with.
*
* By default, all images are loaded with CORS_NONE and cannot be used
* cross-origin in context like WebGL.
*
* If an HTML img element has the crossorigin attribute set, the imgIRequest
* will be validated for cross-origin usage with CORS, and, if successful,
* will have its CORS mode set to the relevant type.
*/
//@{
const long CORS_NONE = 1;
const long CORS_ANONYMOUS = 2;
const long CORS_USE_CREDENTIALS = 3;
//@}
/**
* The CORS mode that this image was loaded with.
*/
readonly attribute long CORSMode;
/**
* Cancels this request as in nsIRequest::Cancel(); further, also nulls out
* decoderObserver so it gets no further notifications from us.
*
* NOTE: You should not use this in any new code; instead, use cancel(). Note
* that cancel() is asynchronous, which means that some time after you call
* it, the listener/observer will get an OnStopRequest(). This means that, if
* you're the observer, you can't call cancel() from your destructor.
*/
void cancelAndForgetObserver(in nsresult aStatus);
/**
* Requests a synchronous decode for the image.
*
* imgIContainer has a startDecoding() method, but callers may want to request
* a decode before the container has necessarily been instantiated. Calling
* startDecoding() on the imgIRequest simply forwards along the request if the
* container already exists, or calls it once the container becomes available
* if it does not yet exist.
*/
void startDecoding(in uint32_t aFlags);
/**
* Exactly like startDecoding above except returns whether the current frame
* of the image is complete or not.
*/
[noscript, notxpcom] boolean startDecodingWithResult(in uint32_t aFlags);
/**
* Locks an image. If the image does not exist yet, locks it once it becomes
* available. The lock persists for the lifetime of the imgIRequest (until
* unlockImage is called) even if the underlying image changes.
*
* If you don't call unlockImage() by the time this imgIRequest goes away, it
* will be called for you automatically.
*
* @see imgIContainer::lockImage for documentation of the underlying call.
*/
void lockImage();
/**
* Unlocks an image.
*
* @see imgIContainer::unlockImage for documentation of the underlying call.
*/
void unlockImage();
/**
* If this image is unlocked, discard the image's decoded data. If the image
* is locked or is already discarded, do nothing.
*/
void requestDiscard();
/**
* If this request is for an animated image, the method creates a new
* request which contains the current frame of the image.
* Otherwise returns the same request.
*/
imgIRequest getStaticRequest();
/**
* Requests that the image animate (if it has an animation).
*
* @see Image::IncrementAnimationConsumers for documentation of the
* underlying call.
*/
void incrementAnimationConsumers();
/**
* Tell the image it can forget about a request that the image animate.
*
* @see Image::DecrementAnimationConsumers for documentation of the
* underlying call.
*/
void decrementAnimationConsumers();
/**
* Request loading priority boost to requested category, each category
* of request increases priority only one time..
*
* CATEGORY_FRAME_INIT: increase priority when the imgRequest is associated
* with an nsImageFrame.
*
* CATEGORY_SIZE_QUERY: increase priority when size decoding is necessary to
* determine the layout size of the associated nsImageFrame.
*
* CATEGORY_DISPLAY: increase priority when the image is about to be displayed
* in the viewport.
*/
const uint32_t CATEGORY_FRAME_INIT = 1 << 0;
const uint32_t CATEGORY_SIZE_QUERY = 1 << 1;
const uint32_t CATEGORY_DISPLAY = 1 << 2;
void boostPriority(in uint32_t aCategory);
};