gecko-dev/gfx/public/nsIImageObserver.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsIImageObserver_h___
#define nsIImageObserver_h___
#include <stdio.h>
#include "nsISupports.h"
#include "nscore.h"
class nsIImage;
class nsIImageRequest;
class nsIImageGroup;
/// Image request notifications
typedef enum {
nsImageNotification_kStartURL, // Start of decode/display for URL.
nsImageNotification_kDescription, // Availability of image description.
nsImageNotification_kDimensions, // Availability of image dimensions.
nsImageNotification_kIsTransparent, // This image is transparent.
nsImageNotification_kPixmapUpdate, // Change in a rectangular area of
// pixels.
nsImageNotification_kFrameComplete, // Completion of a frame of an animated
// image.
nsImageNotification_kProgress, // Notification of percentage decoded.
nsImageNotification_kImageComplete, // Completion of image decoding. There
// may be multiple instances of this
// event per URL due to server push,
// client pull or looping GIF animation.
nsImageNotification_kStopURL, // Completion of decode/display for URL.
nsImageNotification_kImageDestroyed,// Finalization of an image request. This
// is an indication to perform any
// observer related cleanup.
nsImageNotification_kAborted, // Image decode was aborted by either
// the network library or Interrupt().
nsImageNotification_kInternalImage // Internal image icon.
} nsImageNotification;
/// Image group notifications
typedef enum {
// Start of image loading. Sent when a loading image is
// added to an image group which currently has no loading images.
nsImageGroupNotification_kStartedLoading,
// Some images were aborted. A finished loading message will not be sent
// until the aborted images have been destroyed.
nsImageGroupNotification_kAbortedLoading,
// End of image loading. Sent when the last of the images currently
// in the image group has finished loading.
nsImageGroupNotification_kFinishedLoading,
// Start of image looping. Sent when an animated image starts looping in
// an image group which currently has no looping animations.
nsImageGroupNotification_kStartedLooping,
// End of image looping. Sent when the last of the images currently in
// the image group has finished looping.
nsImageGroupNotification_kFinishedLooping
} nsImageGroupNotification;
/// Image loading errors
typedef enum {
nsImageError_kNotInCache, // Image URL not available in cache when
// kOnlyFromCache flag was set.
nsImageError_kNoData, // Network library unable to fetch
// provided URL.
nsImageError_kImageDataCorrupt, // Checksum error of some kind in
// image data.
nsImageError_kImageDataTruncated, // Missing data at end of stream.
nsImageError_kImageDataIllegal, // Generic image data error.
nsImageError_kInternalError // Internal Image Library error.
} nsImageError;
// IID for the nsIImageRequestObserver interface
#define NS_IIMAGEREQUESTOBSERVER_IID \
{ 0x965467a0, 0xb8f4, 0x11d1, \
{ 0x9b, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
// IID for the nsIImageGroupObserver interface
#define NS_IIMAGEGROUPOBSERVER_IID \
{ 0xb3cad300, 0xb8f4, 0x11d1, \
{ 0x9b, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
/**
* Image request observer interface. The implementor will be notified
* of significant loading events or loading errors.
*/
class nsIImageRequestObserver : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IIMAGEREQUESTOBSERVER_IID)
/**
* Notify the observer of some significant image event. The parameter
* values depend on the notification type as specified below.
*
* kDescription - aParam3 is a string containing the human readable
* description of an image, e.g. "GIF89a 320 x 240 pixels".
* The string storage is static, so it must be copied if
* it is to be preserved after the call to the observer.
* kDimensions - aParam1 and aParam2 are the width and height respectively
* of the image in pixels.
* kPixmapUpdate - aParame3 is a pointer to a nsRect struct containing the
* rectangular area of pixels which has been modified by
* the image library. This notification enables the
* client to drive the progressive display of the image.
* kProgress - aParam1 represents the estimated percentage decoded. This
* notification occurs at unspecified intervals. Provided
* that decoding proceeds without error, it is guaranteed that
* notification will take place on completion with a
* percent_progress value of 100.
*
* @param aImageRequest - the image request in question
* @param aImage - the corresponding image object
* @param aNotificationType - the type of notification
* @param aParam1, aParam2, aParam3 - additional information as described
* above.
*/
virtual void Notify(nsIImageRequest *aImageRequest,
nsIImage *aImage,
nsImageNotification aNotificationType,
PRInt32 aParam1, PRInt32 aParam2,
void *aParam3)=0;
/**
* Notify the observer of an error during image loading.
*
* @param aImageRequest - the image request in question
* @param aErrorType - the error code
*/
virtual void NotifyError(nsIImageRequest *aImageRequest,
nsImageError aErrorType)=0;
};
/**
* Image group observer interface. The implementor will be notified
* of significant image group events.
*/
class nsIImageGroupObserver : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IIMAGEGROUPOBSERVER_IID)
/**
* Notify the observer of some significant image group event.
*
* @param aImageGroup - the image group in question
* @param aNotificationType - the notification code
*/
virtual void Notify(nsIImageGroup *aImageGroup,
nsImageGroupNotification aNotificationType)=0;
};
#endif