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121 строка
3.9 KiB
Plaintext
121 строка
3.9 KiB
Plaintext
/** -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "imgIContainerObserver.idl"
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interface imgIRequest;
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interface imgIContainer;
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%{C++
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#include "nsRect.h"
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%}
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/**
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* imgIDecoderObserver interface
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*
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* This interface is used both for observing imgIDecoder objects and for
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* observing imgIRequest objects. In the former case, aRequest is
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* always null.
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*
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* We make the distinction here between "load" and "decode" notifications. Load
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* notifications are fired as the image is loaded from the network or
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* filesystem. Decode notifications are fired as the image is decoded. If an
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* image is decoded on load and not visibly discarded, decode notifications are
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* nested logically inside load notifications as one might expect. However, with
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* decode-on-draw, the set of decode notifications can imgRcome completely _after_
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* the load notifications, and can come multiple times if the image is
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* discardable. Moreover, they can be interleaved in various ways. In general,
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* any presumed ordering between load and decode notifications should not be
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* relied upon.
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*
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* Decode notifications may or may not be synchronous, depending on the
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* situation. If imgIDecoder::FLAG_SYNC_DECODE is passed to a function that
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* triggers a decode, all notifications that can be generated from the currently
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* loaded data fire before the call returns. If FLAG_SYNC_DECODE is not passed,
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* all, some, or none of the notifications may fire before the call returns.
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*
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* This interface will be cleaned up in bug 505385.
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*
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* @author Stuart Parmenter <pavlov@netscape.com>
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* @version 0.1
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* @see imagelib2
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*/
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[scriptable, uuid(0089cf0c-210c-4b44-9ab0-8099b32bcf64)]
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interface imgIDecoderObserver : imgIContainerObserver
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{
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/**
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* Load notification.
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*
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* called at the same time that nsIRequestObserver::onStartRequest would be
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* (used only for observers of imgIRequest objects, which are nsIRequests,
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* not imgIDecoder objects)
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*/
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void onStartRequest();
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/**
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* Decode notification.
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*
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* Called as soon as the image begins getting decoded. This does not include
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* "header-only" decodes used by decode-on-draw to parse the width/height
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* out of the image. Thus, it is a decode notification only.
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*/
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void onStartDecode();
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/**
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* Load notification.
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*
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* Called once enough data has been loaded from the network that we were able
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* to parse the width/height from the image. By the time this callback is been
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* called, the size has been set on the container and STATUS_SIZE_AVAILABLE
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* has been set on the associated imgRequest.
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*/
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void onStartContainer();
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/**
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* Decode notification.
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*
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* called when there is more to paint.
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*/
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[noscript] void onDataAvailable([const] in nsIntRect aRect);
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/**
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* Decode notification.
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*
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* called when a frame is finished decoding.
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*/
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void onStopFrame();
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/**
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* Notification for when an image is known to be animated. This should be
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* fired at the earliest possible time.
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*/
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void onImageIsAnimated();
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/**
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* Decode notification.
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*
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* Called when all decoding has terminated.
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*/
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void onStopDecode(in nsresult status);
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/**
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* Load notification.
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*
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* called at the same time that nsIRequestObserver::onStopRequest would be
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* (used only for observers of imgIRequest objects, which are nsIRequests,
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* not imgIDecoder objects)
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*/
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void onStopRequest(in boolean aIsLastPart);
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/**
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* Called when the decoded image data is discarded. This means that the frames
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* no longer exist in decoded form, and any attempt to access or draw the
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* image will initiate a new series of progressive decode notifications.
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*/
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void onDiscard();
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};
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