/*
 * $Xorg: extutil.h,v 1.4 2001/02/09 02:03:24 xorgcvs Exp $
 *
Copyright 1989, 1998  The Open Group

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 *
 * 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
/* vi: set ts=4 sw=4 expandtab: */