зеркало из https://github.com/mozilla/pjs.git
136 строки
5.1 KiB
C++
136 строки
5.1 KiB
C++
/* -*- 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 nsIImageGroup_h___
|
|
#define nsIImageGroup_h___
|
|
|
|
#include <stdio.h>
|
|
#include "nsISupports.h"
|
|
#include "nscore.h"
|
|
#include "nsColor.h"
|
|
|
|
class nsIImageGroupObserver;
|
|
class nsIImageRequestObserver;
|
|
class nsIImageRequest;
|
|
class nsIDeviceContext;
|
|
class nsIStreamListener;
|
|
class nsIURLGroup;
|
|
|
|
/** For important images, like backdrops. */
|
|
#define nsImageLoadFlags_kHighPriority 0x01
|
|
/** Don't throw this image out of cache. */
|
|
#define nsImageLoadFlags_kSticky 0x02
|
|
/** Don't get image out of image cache. */
|
|
#define nsImageLoadFlags_kBypassCache 0x04
|
|
/** Don't load if image cache misses. */
|
|
#define nsImageLoadFlags_kOnlyFromCache 0x08
|
|
|
|
// IID for the nsIImageGroup interface
|
|
#define NS_IIMAGEGROUP_IID \
|
|
{ 0xbe927e40, 0xaeaa, 0x11d1, \
|
|
{ 0x9b, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
|
|
|
|
/**
|
|
*
|
|
* Image group. A convenient way to group a set of image load requests
|
|
* and control them as a group.
|
|
*/
|
|
class nsIImageGroup : public nsISupports
|
|
{
|
|
public:
|
|
/**
|
|
* Initialize an image group with a device context. All images
|
|
* in this group will be decoded for the specified device context.
|
|
*/
|
|
virtual nsresult Init(nsIDeviceContext *aDeviceContext,
|
|
nsIURLGroup* aURLGroup) = 0;
|
|
|
|
/**
|
|
* Add an observers to be informed of image group notifications.
|
|
*
|
|
* @param aObserver - An observer to add to the observer list.
|
|
* @param boolean indicating whether addition was successful.
|
|
*/
|
|
virtual PRBool AddObserver(nsIImageGroupObserver *aObserver) = 0;
|
|
|
|
/**
|
|
* Remove a previously added observer from the observer list.
|
|
*
|
|
* @param aObserver - An observer to remove from the observer list.
|
|
* @param boolean indicating whether the removal was successful.
|
|
*/
|
|
virtual PRBool RemoveObserver(nsIImageGroupObserver *aObserver) = 0;
|
|
|
|
/**
|
|
* Fetch the image corresponding to the specified URL.
|
|
*
|
|
* @param aUrl - the URL of the image to be loaded.
|
|
* @param aObserver - the observer is notified at significant
|
|
* points in image loading.
|
|
* @param aWidth, aHeight - These parameters specify the target
|
|
* dimensions of the image. The image will be stretched
|
|
* horizontally, vertically or both to meet these parameters.
|
|
* If both width and height are zero, the image is decoded
|
|
* using its "natural" size. If only one of width and height
|
|
* is zero, the image is scaled to the provided dimension, with
|
|
* the unspecified dimension scaled to maintain the image's
|
|
* original aspect ratio.
|
|
* @param aBackgroundColor - If the background color is NULL, a mask
|
|
* will be generated for any transparent images. If background
|
|
* color is non-NULL, it indicates the RGB value to be painted
|
|
* into the image for "transparent" areas of the image, in which
|
|
* case no mask is created. This is intended for backdrops and
|
|
* printing.
|
|
* @param aFlags - image loading flags are specified above
|
|
*
|
|
* @return the resulting image request object.
|
|
*/
|
|
virtual nsIImageRequest* GetImage(const char* aUrl,
|
|
nsIImageRequestObserver *aObserver,
|
|
const nscolor* aBackgroundColor,
|
|
PRUint32 aWidth, PRUint32 aHeight,
|
|
PRUint32 aFlags) = 0;
|
|
|
|
/**
|
|
* Like GetImage except load the image from a live stream.
|
|
* The call returns an nsIImageRequest and an nsIStreamListener
|
|
* that should be connected to the live stream to accept
|
|
* the image data.
|
|
*/
|
|
NS_IMETHOD GetImageFromStream(const char* aURL,
|
|
nsIImageRequestObserver *aObserver,
|
|
const nscolor* aBackgroundColor,
|
|
PRUint32 aWidth, PRUint32 aHeight,
|
|
PRUint32 aFlags,
|
|
nsIImageRequest*& aResult,
|
|
nsIStreamListener*& aListenerResult) = 0;
|
|
|
|
/**
|
|
* Halt decoding of images or animation without destroying associated
|
|
* pixmap data. All ImageRequests created with this ImageGroup
|
|
* are interrupted.
|
|
*/
|
|
virtual void Interrupt(void) = 0;
|
|
};
|
|
|
|
/// Factory method for creating an image group
|
|
extern "C" NS_GFX_(nsresult)
|
|
NS_NewImageGroup(nsIImageGroup **aInstancePtrResult);
|
|
|
|
#endif
|