/*

 * $Xorg: extutil.h,v 1.4 2001/02/09 02:03:24 xorgcvs Exp $

 *

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its

documentation for any purpose is hereby granted without fee, provided that

the above copyright notice appear in all copies and that both that

copyright notice and this permission notice appear in supporting

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The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE

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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

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in this Software without prior written authorization from The Open Group.

 *

 * Author:  Jim Fulton, MIT The Open Group

 * 

 *                     Xlib Extension-Writing Utilities

 *

 * This package contains utilities for writing the client API for various

 * protocol extensions.  THESE INTERFACES ARE NOT PART OF THE X STANDARD AND

 * ARE SUBJECT TO CHANGE!

 */

/* $XFree86: xc/include/extensions/extutil.h,v 1.9 2001/12/14 19:53:28 dawes Exp $ */

#ifndef _EXTUTIL_H_

#define _EXTUTIL_H_

#include "SDL_stdinc.h"		/* For portable string functions */

#include "./Xext.h"

/*

 * We need to keep a list of open displays since the Xlib display list isn't

 * public.  We also have to per-display info in a separate block since it isn't

 * stored directly in the Display structure.

 */

typedef struct _XExtDisplayInfo {

    struct _XExtDisplayInfo *next;	/* keep a linked list */

    Display *display;			/* which display this is */

    XExtCodes *codes;			/* the extension protocol codes */

    XPointer data;			/* extra data for extension to use */

} XExtDisplayInfo;

typedef struct _XExtensionInfo {

    XExtDisplayInfo *head;		/* start of list */

    XExtDisplayInfo *cur;		/* most recently used */

    int ndisplays;			/* number of displays */

} XExtensionInfo;

typedef struct _XExtensionHooks {

    int (*create_gc)(

#if NeedNestedPrototypes

	      Display*			/* display */,

	      GC			/* gc */,

	      XExtCodes*		/* codes */

#endif

);

    int (*copy_gc)(

#if NeedNestedPrototypes

	      Display*			/* display */,

              GC			/* gc */,

              XExtCodes*		/* codes */

#endif

);

    int (*flush_gc)(

#if NeedNestedPrototypes

	      Display*			/* display */,

              GC			/* gc */,

              XExtCodes*		/* codes */

#endif

);

    int (*free_gc)(

#if NeedNestedPrototypes

	      Display*			/* display */,

              GC			/* gc */,

              XExtCodes*		/* codes */

#endif

);

    int (*create_font)(

#if NeedNestedPrototypes

	      Display*			/* display */,

              XFontStruct*		/* fs */,

              XExtCodes*		/* codes */

#endif

);

    int (*free_font)(

#if NeedNestedPrototypes

	      Display*			/* display */,

              XFontStruct*		/* fs */,

              XExtCodes*		/* codes */

#endif

);

    int (*close_display)(

#if NeedNestedPrototypes

	      Display*			/* display */,

              XExtCodes*		/* codes */

#endif

);

    Bool (*wire_to_event)(

#if NeedNestedPrototypes

	       Display*			/* display */,

               XEvent*			/* re */,

               xEvent*			/* event */

#endif

);

    Status (*event_to_wire)(

#if NeedNestedPrototypes

	      Display*			/* display */,

              XEvent*			/* re */,

              xEvent*			/* event */

#endif

);

    int (*error)(

#if NeedNestedPrototypes

	      Display*			/* display */,

              xError*			/* err */,

              XExtCodes*		/* codes */,

              int*			/* ret_code */

#endif

);

    char *(*error_string)(

#if NeedNestedPrototypes

	        Display*		/* display */,

                int			/* code */,

                XExtCodes*		/* codes */,

                char*			/* buffer */,

                int			/* nbytes */

#endif

);

} XExtensionHooks;

extern XExtensionInfo *XextCreateExtension(

#if NeedFunctionPrototypes

    void

#endif

);

extern void XextDestroyExtension(

#if NeedFunctionPrototypes

    XExtensionInfo*	/* info */

#endif

);

extern XExtDisplayInfo *XextAddDisplay(

#if NeedFunctionPrototypes

    XExtensionInfo*	/* extinfo */,

    Display*		/* dpy */,

    char*		/* ext_name */,

    XExtensionHooks*	/* hooks */,

    int			/* nevents */,

    XPointer		/* data */

#endif

);

extern int XextRemoveDisplay(

#if NeedFunctionPrototypes

    XExtensionInfo*	/* extinfo */,

    Display*		/* dpy */

#endif

);

extern XExtDisplayInfo *XextFindDisplay(

#if NeedFunctionPrototypes

    XExtensionInfo*	/* extinfo */,

    Display*		/* dpy */

#endif

);

#define XextHasExtension(i) ((i) && ((i)->codes))

#define XextCheckExtension(dpy,i,name,val) \

  if (!XextHasExtension(i)) { XMissingExtension (dpy, name); return val; }

#define XextSimpleCheckExtension(dpy,i,name) \

  if (!XextHasExtension(i)) { XMissingExtension (dpy, name); return; }

/*

 * helper macros to generate code that is common to all extensions; caller

 * should prefix it with static if extension source is in one file; this

 * could be a utility function, but have to stack 6 unused arguments for 

 * something that is called many, many times would be bad.

 */

#define XEXT_GENERATE_FIND_DISPLAY(proc,extinfo,extname,hooks,nev,data) \

XExtDisplayInfo *proc (Display *dpy) \

{ \

    XExtDisplayInfo *dpyinfo; \

    if (!extinfo) { if (!(extinfo = XextCreateExtension())) return NULL; } \

    if (!(dpyinfo = XextFindDisplay (extinfo, dpy))) \

      dpyinfo = XextAddDisplay (extinfo,dpy,extname,hooks,nev,data); \

    return dpyinfo; \

}

#define XEXT_FIND_DISPLAY_PROTO(proc) \

	XExtDisplayInfo *proc(Display *dpy)

#define XEXT_GENERATE_CLOSE_DISPLAY(proc,extinfo) \

int proc (Display *dpy, XExtCodes *codes) \

{ \

    return XextRemoveDisplay (extinfo, dpy); \

}

#define XEXT_CLOSE_DISPLAY_PROTO(proc) \

	int proc(Display *dpy, XExtCodes *codes)

#define XEXT_GENERATE_ERROR_STRING(proc,extname,nerr,errl) \

char *proc (Display *dpy, int code, XExtCodes *codes, char *buf, int n) \

{  \

    code -= codes->first_error;  \

    if (code >= 0 && code < nerr) { \

	char tmp[256]; \

	SDL_snprintf (tmp, SDL_arraysize(tmp), "%s.%d", extname, code); \

	XGetErrorDatabaseText (dpy, "XProtoError", tmp, errl[code], buf, n); \

	return buf; \

    } \

    return (char *)0; \

}

#define XEXT_ERROR_STRING_PROTO(proc) \

	char *proc(Display *dpy, int code, XExtCodes *codes, char *buf, int n)

#endif