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311 строки
13 KiB
C
311 строки
13 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/* -*- Mode: C; tab-width: 4 -*-
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* libimg.h --- API calls to the Image Library.
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* $Id: libimg.h,v 3.1 1998/03/28 03:34:57 ltabb Exp $
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*/
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#ifndef _LIBIMG_H
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#define _LIBIMG_H
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#include "xp_core.h" /* For XP_BEGIN_PROTOS/XP_END_PROTOS. */
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#include "dummy_nc.h" /* Dummy Net Context */
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#include "il_types.h"
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#include "MIMGCBIF.h" /* JMC generated callback interface. */
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#include "MIMGCB.h" /* JMC generated callback interface
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implementation. */
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#include "MPSIMGCB.h" /* JMC generated callback interface
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implementation for PostScript Front End. */
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/*********************** Observers and Observables ***************************/
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/* This is the cross-platform observer mechanism. The image library's client
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should create an XP_ObserverList, and pass it into IL_GetImage(). This
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observer list represents the set of client-provided callbacks to be
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associated with the IL_ImageReq handle returned by IL_GetImage. Callbacks
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will be invoked with an appropriate message, whenever the image library
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wishes to notify its clients of the availability of information about the
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image or other important changes in the image. The observer list's
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XP_Observable will be set by IL_GetImage, so the XP_ObserverList should be
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created with a NULL observable. */
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#include "xp_obs.h"
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/**************************** Initialization *********************************/
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XP_BEGIN_PROTOS
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/* One-time image library initialization.
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- Initialize internal state.
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- Scan image plug-in directory.
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- Register individual image decoders with the netlib. */
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extern int
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IL_Init(void);
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/* Used when exiting the client, this code frees all imagelib data structures.
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This is done for two reasons:
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- It makes leakage analysis of the heap easier.
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- It causes resources to be freed on 16-bit Windows that would otherwise
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persist beyond the program's lifetime. */
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extern void
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IL_Shutdown(void);
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/********************** Image Group Contexts *********************************/
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/* Create an IL_GroupContext, which represents an aggregation of state
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for one or more images and which contains an interface to access
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external service functions and callbacks. IL_NewGroupContext will use
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the IMGCBIF_AddRef callback to increment the reference count for the
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interface.
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The display_context argument is opaque to the image library and is
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passed back to all of the callbacks in IMGCBIF interface. */
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extern IL_GroupContext *
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IL_NewGroupContext(void *display_context, IMGCBIF *image_callbacks);
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/* Free an image context. IL_DestroyGroupContext will make a call
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to the IMGCBIF_Release callback function of the JMC interface prior to
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releasing the IL_GroupContext structure. The IMGCBIF_Release callback
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is expected to decrement the reference count for the IMGCBIF interface,
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and to free the callback vtable and the interface structure if the
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reference count is zero. */
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extern void
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IL_DestroyGroupContext(IL_GroupContext *image_context);
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/* Add an observer/closure pair to an image group context's observer list.
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Returns PR_TRUE if the observer is successfully registered. */
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extern PRBool
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IL_AddGroupObserver(IL_GroupContext *img_cx, XP_ObserverProc observer,
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void *closure);
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/* Remove an observer/closure pair from an image group context's observer
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list. Returns PR_TRUE if successful. */
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extern PRBool
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IL_RemoveGroupObserver(IL_GroupContext *img_cx, XP_ObserverProc observer,
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void *closure);
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/************************* Primary API functions *****************************/
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/* This is the primary entry point to the imagelib, used to map from a
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URL to a pixmap, fetching and decoding as necessary.
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The width and height parameters specify the target dimensions of
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the image. The image will be stretched horizontally, vertically or
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both to meet these parameters. If both width and height are zero,
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the image is decoded using its "natural" size. If only one of
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width and height is zero, the image is scaled to the provided
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dimension, with the unspecified dimension scaled to maintain the
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image's original aspect ratio.
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If background_color is NULL, a separate mask pixmap will be
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constructed for any transparent images. If background_color is
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non-NULL, it indicates the RGB value to be painted into the image
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for "transparent" areas of the image, in which case no mask is
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created. This is intended for backdrops and printing.
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The observable is an opaque pointer that is passed back to observer
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callback functions.
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The following flags may be set when calling IL_GetImage:
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- IL_HIGH_PRIORITY - For important images, like backdrops.
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- IL_STICKY - Don't throw this image out of cache.
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- IL_BYPASS_CACHE - Don't get image out of image cache.
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- IL_ONLY_FROM_CACHE - Don't load if image cache misses.
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The net_group_context is passed back to netlib functions. It must
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encapsulate the notion of disk cache reload policy which, in
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previous incarnations of this function, was passed in explicitly.
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There is also an assumption being made here that there is some way to
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create a Net Context from this Net Group Context in which Navigator UI
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(animation, status, progress, etc.) can be suppressed.*/
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extern IL_ImageReq *
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IL_GetImage(const char* url,
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IL_GroupContext *image_context,
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XP_ObserverList observer_list,
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IL_IRGB *background_color,
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uint32 width, uint32 height,
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uint32 flags,
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IL_NetContext *net_context);
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/* Release a reference to an image lib request. If there are no other
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clients of the request's associated pixmap, any related netlib
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activity is terminated and pixmap storage may be reclaimed. */
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extern void
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IL_DestroyImage (IL_ImageReq *image_req);
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/* XXX - This is a new API call to reload all images associated with a
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given IL_GroupContext. The purpose of this call is to allow all images
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in a document to be reloaded and redecoded to a different bit depth based
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on memory considerations. This process involves the destruction of the
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old IL_Pixmap structures and the allocation of new structures corresponding
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to the new bit depth. */
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extern void
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IL_ReloadImages(IL_GroupContext *image_context, IL_NetContext *net_context);
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/* Halt decoding of images or animation without destroying associated
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pixmap data. This may abort any associated netlib streams. All
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IL_ImageReq's created with the given IL_GroupContext are interrupted. */
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extern void
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IL_InterruptContext(IL_GroupContext *image_context);
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/* Display a rectangular portion of an image. x and y refer to the top left
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corner of the image, measured in pixels, with respect to the document
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origin. x_offset and y_offset are measured in pixels, with the
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upper-left-hand corner of the pixmap as the origin, increasing
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left-to-right, top-to-bottom.
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If the width and height values would otherwise cause the sub-image
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to extend off the edge of the source image, the function should
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perform tiling of the source image. This is used to draw document,
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layer and table cell backdrops. (Note: it is assumed this case will
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apply only to images which do not require any scaling.)
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If at any time the image library determines that an image request cannot
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be fulfilled or that the image has been delayed, it will notify the client
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synchronously through the observer mechanism. The client may then choose to
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request that an icon be drawn instead by making a call to IL_DisplayIcon. */
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extern void
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IL_DisplaySubImage(IL_ImageReq *image_req, int x, int y, int x_offset,
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int y_offset, int width, int height);
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/* Display an icon. x and y refer to the top left corner of the icon, measured
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in pixels, with respect to the document origin. */
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extern void
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IL_DisplayIcon(IL_GroupContext *img_cx, int icon_number, int x, int y);
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/* Return the dimensions of an icon. */
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extern void
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IL_GetIconDimensions(IL_GroupContext *img_cx, int icon_number, int *width,
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int *height);
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/********************* Pixmap access functions *******************************/
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/* Return the image IL_Pixmap associated with an image request. */
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extern IL_Pixmap *
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IL_GetImagePixmap(IL_ImageReq *image_req);
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/* Return the mask IL_Pixmap associated with an image request. */
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extern IL_Pixmap *
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IL_GetMaskPixmap(IL_ImageReq *image_req);
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/********************* Image query functions *******************************/
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/* Return the natural dimensions of the image. Returns 0,0 if the dimensions
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are unknown. */
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extern void
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IL_GetNaturalDimensions(IL_ImageReq *image_req, int *width, int *height);
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/*********************** Per-context Preferences and Settings ****************/
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/* Instruct the Image Library how to render images to the Display Front End.
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The display_flags argument indicates which display settings are to be
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affected. Flags which may be set include:
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- IL_DISPLAY_CONTEXT - Set the display context. Must be compatible with
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the one used to create the IL_GroupContext.
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- IL_DISPLAY_TYPE - Set the display type.
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- IL_COLOR_SPACE - Set the display colorspace.
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- IL_PROGRESSIVE_DISPLAY - Turn progressive display on or off.
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- IL_DITHER_MODE - Set dither mode.
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The display_data argument provides the required data for the new settings.
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- display_context - An opaque pointer to the FE's display context.
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- display_type - IL_Console, IL_Printer, IL_PostScript or
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IL_MetaFile.
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- color_space - A pointer to the Display FE's colorspace.
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- progressive_display - Toggle for progressive image display.
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- dither_mode - IL_ClosestColor, IL_Dither or IL_Auto. */
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extern void
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IL_SetDisplayMode(IL_GroupContext *image_context, uint32 display_flags,
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IL_DisplayData *display_data);
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/************************ Image format identification ************************/
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/* Determine the type of the image, based on the first few bytes of data. */
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extern int
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IL_Type(const char *buf, int32 len);
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/************************ Global imagelib settings ***************************/
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/* Set limit on approximate size, in bytes, of all pixmap storage used by the
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Image Library. */
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extern void
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IL_SetCacheSize(uint32 new_size);
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/************************ Memory management **********************************/
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/* Free num_bytes of memory by flushing the Least Recently Used (LRU) images
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from the image cache. */
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extern void
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IL_FreeMemory(IL_GroupContext *image_context, uint32 num_bytes);
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/********************** Mac-specific memory-management ***********************/
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/* Attempt to release the memory used by a specific image in the image
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cache. The memory won't be released if the image is still in use
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by one or more clients. XXX - Can we get rid of this call ? Why
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the hell do we need this ? */
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extern void
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IL_UnCache(IL_Pixmap *pixmap);
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/* Attempts to release some memory by freeing an image from the image
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cache. This may not always be possible either because all images
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in the cache are in use or because the cache is empty. Returns the
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new approximate size of the imagelib cache. */
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extern uint32
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IL_ShrinkCache(void);
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/* Return the approximate storage consumed by the imagelib cache, in bytes */
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extern uint32
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IL_GetCacheSize(void);
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/************************ Miscellaneous garbage ******************************/
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/* Returns a pointer to a string containing HTML appropriate for displaying
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in a DocInfo window. The caller may dispose of the string using XP_FREE. */
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extern char *
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IL_HTMLImageInfo(char *url_address);
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/* Wacky netlib callback designed to give precedence to streams that block
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layout. */
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extern PRBool
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IL_PreferredStream(IL_URL *urls);
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/* This is a legacy "safety-valve" routine, called each time a new HTML page
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is loaded. It causes remaining references to images in the given group
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context to be freed, i.e. like calling IL_DestroyImage on each of them.
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This is primarily required because layout sometimes leaks images, and it
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should go away when we can fix layout. */
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extern void
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IL_DestroyImageGroup(IL_GroupContext *image_context);
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XP_END_PROTOS
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#endif /* _LIBIMG_H */
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