gecko-dev/gfx/public/nsIImageManager.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 nsIImageManager_h___
#define nsIImageManager_h___
#include <stdio.h>
#include "nsISupports.h"
#include "nscore.h"
typedef enum
{
nsImageType_kUnknown = 0,
nsImageType_kGIF = 1,
nsImageType_kXBM = 2,
nsImageType_kJPEG = 3,
nsImageType_kPPM = 4,
nsImageType_kPNG = 5
} nsImageType;
// IID for the nsIImageManager interface
#define NS_IIMAGEMANAGER_IID \
{ 0x9f327100, 0xad5a, 0x11d1, \
{ 0x9b, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
/**
*
* Image manager. There is only a single instance, returned when invoking
* the factory instantiation method. A user of the image library should
* hold on to the singleton image manager.
*/
class nsIImageManager : public nsISupports
{
public:
/// Initialization method to be called before use
virtual nsresult Init() = 0;
/// Set the size (in bytes) image cache maintained by the image manager
virtual void SetCacheSize(PRInt32 aCacheSize) = 0;
/// @return the current size of the image cache (in bytes)
virtual PRInt32 GetCacheSize(void) = 0;
/**
* Attempts to release some memory by freeing an image from the image
* cache. This may not always be possible either because all images
* in the cache are in use or because the cache is empty.
*
* @return the new approximate size of the imagelib cache.
*/
virtual PRInt32 ShrinkCache(void) = 0;
/**
* Determine the type of the image, based on the first few bytes of data.
*
* @param buf - a buffer of image data
* @param length - the length of the buffer
*
* @return the type of the image, if known
*/
virtual nsImageType GetImageType(const char *buf, PRInt32 length) = 0;
};
/// Factory method to get a reference to the singleton image manager
extern "C" NS_GFX_(nsresult)
NS_NewImageManager(nsIImageManager **aInstancePtrResult);
#endif